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Transient Characteristic of MOESFET Based on Cosimulation Simulink with COMSOL GAO Bing, WANG Shuai, ZHONG Yongheng, SUN Yasen, ZHANG Shangchen, ZHOU Jie Hunan Electric Power    2022, 42 (5): 1-7.   DOI: 10.3969/j.issn.1008-0198.2022.05.001 Abstract （618）      PDF（pc） （5562KB）（1973）       Knowledge map    Save Power devices are one of the weak links in power electronic systems, and their failure has obvious multi-scale characteristics. It is of great significance to build a transient model that can consider the multi-scale characteristics of power devices for device condition monitoring and aging evaluation. Therefore, this paper takes MOSFET as the research object, constructs the field circuit joint simulation model of power device Simulink and COMSOL, and realizes the transient characteristic analysis of devices considering the interaction of device switching information and macro physical information by selecting the on current and on voltage drop as the model interaction information. The average temperature at the chip (shell temperature), the average temperature on the surface of the chip (junction temperature), the conduction voltage drop, the chip resistance and the maximum displacement of the solder layer are analyzed. The results show that the model can effectively consider the switching characteristics of devices and the interaction between macro fields, and lay the foundation for the digital twin model of devices. Reference | Related Articles | Metrics

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Governance Method of Power Quality in New Power Distribution Area Based on Energy Storage System LAN Zheng, YIN Rui, ZOU Bin, HE Dong Hunan Electric Power    2023, 43 (4): 56-62.   DOI: 10.3969/j.issn.1008-0198.2023.04.008 Abstract （267）      PDF（pc） （3308KB）（530）       Knowledge map    Save In the new power distribution area, due to the wide application of power electronic devices and the access of a large number of distributed energy sources, the power quality of the new power distribution area is seriously affected and the power fluctuation is caused. In order to improve the power quality and power fluctuation of the new power distribution area, a new power quality management method based on energy storage system is proposed. This method can improve the comprehensive adjusting ability of the energy storage system at the head of the area. It can not only control the current harmonics, reactive power and unbalance current of the new power distribution area, but also stabilize the active power effectively. Firstly, the structure of the new power distribution area and the topology of the energy storage system are introduced, and the mathematical model is built. Then, in the harmonic detection section of the control section, the four-wire ip-iq harmonic detection method based on moving mean filter is adopted. And in the process of energy storage power adjustment, the strategy of battery charging and discharging considering energy storage capacity is adopted. At the same time, the command current is accurately tracked by repetitive control and PI control. Finally, the simulation results show that the proposed energy storage system and its control strategy can not only effectively improve the power quality of the new power distribution area, but also smooth the active power fluctuation. Reference | Related Articles | Metrics

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Research on Grounding Grid Corrosion Diagnosis Based on Electromagnetic Field Theory and Earth Surface Potential CHU Xu, YU Shaoshuai, YAN Yabing, LI Hui Hunan Electric Power    2023, 43 (4): 118-124.   DOI: 10.3969/j.issn.1008-0198.2023.04.018 Abstract （205）      PDF（pc） （6036KB）（192）       Knowledge map    Save Because of its large scale, complex structure and strong electromagnetic interference, the grounding grid of the substation has the problems of difficult detection and large error in corrosion diagnosis. Aiming at these problems,this article proposes a method based on the combination of electromagnetic field theory (EFT) and earth surface potential (ESP) to diagnose the corrosion conductor of grounding grid,so as to make up for the defect of poor measurement accuracy of EFT method under strong magnetic interference. This method first analyzes the magnetic induction intensity distribution of the corroded conductor on the basis of EFT. Then the paper analyzes the ESP distribution of the corroded conductor, combines the magnetic induction intensity curve with the ESP distribution curve, and finally determines the location and type of conductor corrosion. The test shows that the position of the corroded conductor obtained by this method is consistent with the position of the set corroded conductor, which shows the accuracy of the method in diagnosing the corroded conductor. Reference | Related Articles | Metrics

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Analysis on Influence of Separate Operation of 500 kV Bus of UHV Xiaoxiang Station on Hunan Power Grid LIU Yongyan, GAN Wangwei, ZHANG Yan, XIAO Pei, CUI Ting, GUO Hu Hunan Electric Power    2023, 43 (2): 112-116.   DOI: 10.3969/j.issn.1008-0198.2023.02.019 Abstract （257）      PDF（pc） （2529KB）（567）       Knowledge map    Save After the commissioning of the 1 000 kV UHV AC double-circuit line from Xiaoxiang—Ganjiang, the reactive power support capability of the inter-provincial AC channels has been enhanced, and the system stability has been enhanced, but it also leads to the increase of the system short-circuit current. In order to ensure the transient voltage stability of Hunan power grid, it is still necessary to put forward the requirements for the start-up and rotation of units in the province, which limits the power supply capacity and operational flexibility of the power grid. Aiming at this problem, the optimization of 500 kV grid structure in Hunan power grid is studied, and the optimization scheme of 500 kV bus-bar operation in UHV Xiaoxiang station is put forward to reduce the impact of near-area short-circuit fault on the system. It can improve the transient voltage stability level and the power supply capacity of power grid, and provide technical support for the safe and stable operation of Hunan power grid. Reference | Related Articles | Metrics

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Treatment of Oily Wastewater from Substation Accident Oil Pool Based on Process of Magnetic Flocculation and Electrocatalytic Oxidation WAN Tao, CHE Yao, LIU Heng, ZHAO Ruidun, ZHU Qiaoyun, XIANG Jingjing, ZHANG Lei Hunan Electric Power    2022, 42 (5): 69-74.   DOI: 10.3969/j.issn.1008-0198.2022.05.012 Abstract （283）      PDF（pc） （2729KB）（337）       Knowledge map    Save In view of the characteristics of the oil pool wastewater containing a large amount of mineral insulating oil in substation, the combined process of magnetic flocculation and electrocatalytic oxidation is adopted to treat the oil containing wastewater, the flocculation effect of magnetic flocculation and conventional flocculation is compared, and the effect of electro-catalytic oxidation process parameters on oil removal rate in oil-bearing wastewater is studied. The results of dynamic simulation tests show that the combined process has a good effect on the treatment of oil-containing wastewater from the oil pool of a substation accident. The removal rates of oil, chemical oxygen demand,turbidity and ammonia nitrogen are 96.99%,85.98%, 90.85% and 78.86% respectively. The effluent quality meets the first-class standard of Comprehensive Wastewater Discharge Standard. Reference | Related Articles | Metrics

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Design of Digital Drive of High Power High Voltage DC Circuit Breaker Based on IGBT Device ZENG Jinhui, FAN Yangjie, HE Dong, LIU Xiang, LIAO Xiaobin Hunan Electric Power    2022, 42 (5): 8-15.   DOI: 10.3969/j.issn.1008-0198.2022.05.002 Abstract （422）      PDF（pc） （5057KB）（670）       Knowledge map    Save Aiming at the application of high power multi-switch, a new multi-function IGBT digital driver based on field programmble gate array(FPGA)is proposed, which is efficient, safe and reliable.The driver can make use of the full insulated gate bipolar transistor(IGBT)state detection circuit, multi-channel signal fault detection and protection circuit. In the test of multi-switch and high power 10 kV/5 kA circuit breaker, it is proved that the driver can ensure the validity of IGBT's functions such as voltage sharing, current sharing and temperature detection.The function of simultaneous shutdown is realized in 6.4 μs, the switching process of IGBT is optimized, and the safety and reliability of the whole circuit breaker is ensured. Reference | Related Articles | Metrics

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Application of Steam Temperature Control Technology of Wide Load Peak Shaving for Thermal Power Unit WANG Xihui, ZHU Xiaoxing, CHEN Houtao, ZHOU Ke, ZHU Guangming, SHENG Kai , TAO Hailin Hunan Electric Power    2022, 42 (5): 95-100.   DOI: 10.3969/j.issn.1008-0198.2022.05.017 Abstract （304）      PDF（pc） （4074KB）（245）       Knowledge map    Save The steam temperature control method is put forword,and an improved PID control algorithm is designed in the cooling water control circuit, and a modified instruction with self-learning function is introduced to adjust the parameters. In the coordinated control loop, a coordinated control algorithm based on running state analysis and humanoid modification is designed. In practical application, the steam temperature of a 630 MW supercritical unit is well controlled in wet stable operation and variable load operation, dry stable operation and variable load operation under 28.7%~100% rated load interval, the control quality of some working conditions has improved more than 60% compared with the industry standard. When a 1 000 MW ultra-supercritical unit is running in 30%~100% rated load range, the steady state control quality of steam temperature is improved 30%~60% compared with the industry standard. Reference | Related Articles | Metrics

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Comparative Analysis of Aggregation Boosting Methods for Offshore Wind Power HVDC Power Transmission GAO Yue, CHEN Heng, WANG Zhengwei, LEI Jing Hunan Electric Power    2025, 45 (1): 54-60.   DOI: 10.3969/j.issn.1008-0198.2025.01.008 Abstract （143）      PDF（pc） （6483KB）（121）       Knowledge map    Save With the gradual development of offshore wind farms to the deep and distant ocean and the increasing single machine capacity of wind turbine generator in offshore wind farms, problems such as changeable operating environment and increasing construction difficulty of offshore wind farms also arise.Aiming at these problems, a variety of aggregation boost methods of offshore wind power under the condition of HVDC transmission are theoretically analyzed. From the perspective of the economy and energy loss, the construction cost of each program and energy loss in the process are calculated respectively by applying several aggregation boost methods to practical concrete engineering cases. The calculation results are summarized, and the influence of different voltage levels and power types on the offshore wind power collection system is compared and analyzed, and the advantages of DC aggregation boost system in the future development of offshore wind power are proved. Reference | Related Articles | Metrics

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Identification of Hydropower Unit Shafting Fault Based on Multifractal Spectrum and Support Vector Machine MENG Fancong , JI Junjie, XUE Xiaobing, YAO Hangyu, HU Fei, PAN Weifeng, BAI Liang Hunan Electric Power    2022, 42 (5): 114-118.   DOI: 10.3969/j.issn.1008-0198.2022.05.020 Abstract （245）      PDF（pc） （1492KB）（396）       Knowledge map    Save A method based on multifractal spectrum and support vector machine is proposed for fault identification of shafting system of hydropower units. Firstly, the multifractal spectrum algorithm is used to extract the feature data of vibration signals, and then the feature data is used as the input vector of support vector machine to realize the fault classification. The experimental data show that the method can accurately identify the common shafting faults, and provide a new method for the intelligent identification of shafting faults of hydropower units. Reference | Related Articles | Metrics

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Remarks from Invited Editor in Chief LI Peng, SHU Shengwen, QIU Zhibin Hunan Electric Power    2024, 44 (3): 1-2.   Abstract （114）      PDF（pc） （1569KB）（613）       Knowledge map    Save Related Articles | Metrics

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Research on Hoisting Scheme of Special-Shaped Components in UHV Tower Assembly Process JIN Yuzhu, REN Caiheng, GUI Hehuai, ZHU Guanmin, WANG Shuang, MA Tianyuan, TANG Bo Hunan Electric Power    2024, 44 (1): 101-105.   DOI: 10.3969/j.issn.1008-0198.2024.01.014 Abstract （183）      PDF（pc） （2611KB）（176）       Knowledge map    Save In order to provide technical support for the formulation of the hoisting scheme of special shaped components in the erection of UHV transmission towers, this paper takes a large-span single circuit cup-shaped spanning tower as the research object, and uses the structural analysis software Tekla Structure to model some special-shaped components of the tower. The gravity center position of the special-shaped component is calculated, and the hoisting scheme of the special-shaped component is proposed. In order to verify the feasibility of the scheme, the finite element analysis is carried out by using ANSYS software. The analysis results show that the strength of the steel pipe at the counterweight after the component is split meets the requirements, and the hoisting scheme is safe and feasible. It can improve the efficiency of the tower construction ,ensure the safety of the construction,and provide reference for the formulation of the hoisting scheme of the special-shaped components of the UHV transmission tower. Reference | Related Articles | Metrics

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The V2G Collaborative Optimization Strategy Driven by Electricity Prices Response Under the High Proportion of New Energy Penetration XIANG Lifeng, ZHANG Hongwei, ZHANG Xiaodong, CHEN Jie Hunan Electric Power    2025, 45 (6): 1-8.   DOI: 10.3969/j.issn.1008-0198.2025.06.001 Abstract （45）      PDF（pc） （6944KB）（26）       Knowledge map    Save Aiming at the uncertainty of the time distribution of charging demand in vehicle-to-grid (V2G) scheduling and the uncertainty of output under the penetration of high proportion of new energy, which makes it difficult to balance the load of the grid, a V2G collaborative optimization strategy driven by electricity price response under a high proportion of new energy access is proposed. Firstly, a V2G collaborative optimization model driven by electricity price response for high proportion new energy access scenarios is constructed, which guides the charging and discharging behavior of V2G charging piles and electric vehicles by regulating electricity prices, and is optimized with multiple goals to minimize the total cost of the power grid, minimize the peak-to-valley difference of grid load, and maximize user benefits. Secondly, the non-dominated sorting genetic algorithm Ⅲ(NSGA-Ⅲ) algorithm is fused with the Wasserstein generative adversarial network(WGAN) to establish a dynamic adjustment algorithm with non-dominated sorting and crowding distance selection elite solution reward function for solving the model. Case analysis shows that compared with the traditional NSGA-Ⅲ algorithm, the proposed NSGA-Ⅲ WGAN algorithm can effectively reduce the operating cost of the power grid, improve the new energy consumption capacity of the power grid, stabilize the peak-to-valley difference of the load of the power grid, and improve the benefits of users through efficient global search and local fine-tuning capabilities. Reference | Related Articles | Metrics

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Assessment Method of Health Status for Photovoltaic Power Station Sensor Based on Information Fusion and One-Dimensional Convolutional Neural Network YANG Fangliao, HUANG Xin, TAN Hongzhi, MIN Qi, ZHU Shi, YAN Lei Hunan Electric Power    2024, 44 (3): 105-113.   DOI: 10.3969/j.issn.1008-0198.2024.03.015 Abstract （206）      PDF（pc） （4430KB）（107）       Knowledge map    Save :This paper addresses challenge issues of current sensor fault diagnosis methods, including dependence on expert knowledge, ignorance of spatiotemporal correlations with bypass terminals and redundant feature impacts. An approach for sensor health assessment is consequently proposed, utilizing information fusion and one-dimensional convolutional neural networks. Firstly four types of sensor characteristics are selected according to the strong correlation with photovoltaic power prediction,which are statistical features of sensor data streams, temporal characteristics of sensor data streams, data characteristics of bypass terminal, and weather forecast data. Subsequently, a random forest algorithm is employed to select the core features of the sensors. Finally, health status assessment models are separately trained for the two types of sensors. Experimental results demonstrates that the proposed method has achieved accuracy of 99.29% and 99.07% respectively in the health status assessment of temperature and light intensity sensor. Reference | Related Articles | Metrics

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Hunan Electric Power    2023, 43 (2): 1-2.   Abstract （140）      PDF（pc） （1027KB）（316）       Knowledge map    Save Related Articles | Metrics

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Research on Electricity Prediction Model of Power Purchasing Agent Based on K-means Clustering Algorithm and BP Neural Network YU Zhicheng, MU Shicai, LIANG Ye, LI Jiachen, LIN Hua, CHEN Jichen, JIN Xin Hunan Electric Power    2025, 45 (1): 68-72.   DOI: 10.3969/j.issn.1008-0198.2025.01.010 Abstract （181）      PDF（pc） （4161KB）（164）       Knowledge map    Save Through the in-depth portrait analysis of power purchasing agents in a certain region, the influence of different factors on the power consumption of power purchasing agents is studied, and the classification of user groups is realized through the clustering algorithm. Through the neural network algorithm, the longitudinal time series electricity and horizontal influencing factors are incorporated into the prediction formula, and the prediction models conforming to the characteristics of different clusters are constructed. Finally, the models are integrated to achieve high accuracy prediction of the overall electricity. Reference | Related Articles | Metrics

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Analysis of Loop Network Fault Harm in DC Power System CAO Wenbin, LUO Wei, CHEN Ruizhen Hunan Electric Power    2022, 42 (4): 110-114.   DOI: 10.3969/j.issn.1008-0198.2022.03.022 Abstract （296）      PDF（pc） （1165KB）（741）       Knowledge map    Save DC loop network fault is one of the common forms of insulation faults in DC power systems. This article analyzes the causes, types and hazards of ring network faults. Focusing on the equivalent circuit of the DC power system, the voltage manifestations of various ring network faults are expounded from the perspective of circuit structure, and the essence of loop network fault hazards is revealed. Finally, according to the physical phenomenon of the loop network fault, the specific operation method of the loop network fault is given. Reference | Related Articles | Metrics

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Design and Application of Complex Terrain and Omni-Directional Modular Quick Installation Insulating Tower Platform BAI Jianfeng, LEI Dongyun, XIAO Liyong, LI Jinliang Hunan Electric Power    2022, 42 (4): 64-69.   DOI: 10.3969/j.issn.1008-0198.2022.04.013 Abstract （303）      PDF（pc） （4301KB）（365）       Knowledge map    Save With the increasing demand for reliable power supply in distribution network, it is urgent to carry out uninterrupted power supply in the whole region. In order to adapt to the live working environment of power distribution under different terrain, the advantages and disadvantages of common live working insulation platforms are compared and analyzed, and an complex terrain and omni-directional modular quick installation insulation tower platform is designed in this article. A tower body, a hoop holding device, an auxiliary platform and a working platform is comprised in the device.Modular tower section is adopted, inverted or rotary installation mode is designed, and the method of fixing relying on concrete pole is designed in this design. It can meet the three main functional requirements of quick disassembly and quick assembly, multi-purpose and heavy load. The device is suitable for the live working environment of 10 kV overhead distribution line under complex and changeable terrain. The problems of difficult installation and connection of common insulation platforms in rural areas, high requirements for ground flatness, small application scenarios are solved. Reference | Related Articles | Metrics

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Summary of Reliability Research on High Voltage Electrical Device in Substation MA Zhaoxing, CHEN Hao, TANG Yi, SHA Haoyuan, JIANG Minyi Hunan Electric Power    2023, 43 (2): 53-59.   DOI: 10.3969/j.issn.1008-0198.2023.02.009 Abstract （375）      PDF（pc） （1104KB）（658）       Knowledge map    Save Based on the reliability research of high-voltage electrical equipment in substations, this paper introduces the development of the reliability research of high-voltage electrical equipment, discusses the reliability analysis methods of common electrical equipment, and compares the advantages and disadvantages of the analytical and analog methods, the optimal application situation is analyzed, and the combination method and state method under complex system are studied. The future trend of reliability analysis based on multi-methods cross-fusion is prospected. Reference | Related Articles | Metrics

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Strategy of An Improved Adaptive Sliding Mode Controlling Virtual Synchronous Generator Control Based on Direct-Driven Permanent Magnet Wind Power System CHEN Anping, HU Xiaolin, LUO Zhaoxu, CHENG Zhun Hunan Electric Power    2023, 43 (4): 63-73.   DOI: 10.3969/j.issn.1008-0198.2023.04.009 Abstract （218）      PDF（pc） （5028KB）（287）       Knowledge map    Save For the direct-drive permanent magnet synchronous wind generator system, because of the difference of equivalent output impedance between inverters and transmission line impedance, the problems of multi-inverters controlled by traditional virtual synchronous generator (VSG) , such as unequal power distribution and poor circulating current suppression are presented,and an improved adaptive sliding mode control strategy is proposed for multiple VSG power sharing and circulation suppression. The given power calculating is calculated according to the total load capacity and the capacity of each inverter, and the virtual impedance according to the given reactive power to compensate the voltage drop caused by the difference of line impedance is adjusted .The sliding mode control of two VSG is designed in coordinate system, and the sliding mode surface is designed based on the difference between the inverter output voltage and the VSG reference voltage, based on Lyapunov stability theory, an adaptive sliding mode controller is designed, which consists of equivalent control, switching control and adaptive compensation. Compared with the traditional control method, the proposed control strategy power sharing and circulation suppression are achieved , and the distribution accuracy of reactive power and VSG output voltage are improved. Finally, the correctness and validity of the control strategy are verified in MATLAB/Simulink. Reference | Related Articles | Metrics

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Research on Distortion Correction Method of Aerial Photovoltaic Module Images WANG Jiawen, ZHU Yongcan, WANG Shuai, LI Kefeng Hunan Electric Power    2023, 43 (4): 74-79.   DOI: 10.3969/j.issn.1008-0198.2023.04.010 Abstract （329）      PDF（pc） （3609KB）（235）       Knowledge map    Save Aerial photography of photovoltaic components often suffers from distortion due to shooting angle issues, which affects the measurement, recognition, and classification of elements like straight lines, angles, and proportions. To address this problem, this paper proposes an undistorted aerial photovoltaic component image correction method that requires no calibration. The approach first extracts four critical feature points from the photovoltaic component image using a feature point extraction algorithm and then matches them using a feature point matching algorithm to obtain their corresponding relationships before and after distortion. Secondly, the theoretical principles of computational geometry are utilized to compute the parameters T necessary for distortion correction through triangulation and coordinate transformation of the corresponding points. Finally, distortion correction is carried out on the image using parameter T to obtain the corrected photovoltaic component image. This algorithm not only improves the visual correction effect of the image but also increases the accuracy of data by 20%~55%.This method has a high application value in the foreign object recognition, operation and maintenance of the aerial photovoltaics module image. Reference | Related Articles | Metrics

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Study on Core Component Selection of Smart Meter Metering Module Based on TOPSIS of Combination Weighting of Criteria Importance Though Intercrieria Correlation and Coefficient of Variation SHEN Liman, CHEN Hao, ZENG Weijie, CHEN Hong, WANG Zhi Hunan Electric Power    2024, 44 (1): 106-112.   DOI: 10.3969/j.issn.1008-0198.2024.01.015 Abstract （207）      PDF（pc） （1695KB）（146）       Knowledge map    Save Smart energy meter is the core metering terminal in smart grid, and the stability of its performance is determined by the performance of its internal core components. However, the current option methods for core components are based on subjective experience selection, and the selection results lack objectivity. Therefore, this paper proposes a technique for order preference by similarity to ideal solution selection method based on the combination weighting of criteria importance though intercrieria correlation (CRITIC)and coefficient of variation (CoV) method, which reduces the influence of the CRITIC method on the comparative strength of indicators by introducing the CoV method to represent the comparative strength of indicators, and improves the objectivity and accuracy of the selection results. At the same time, considering the functional attributes of the three core components of the smart energy meter metering module, namely, high-precision analog-to-digital converter, high-speed microcontroller unit processor and voltage reference chip, corresponding functional selection indexes are proposed. By comparing with the results based on the electrical parameter test, the feasibility of the proposed method and indexes applied to the selection of core components for smart energy meter metering module is proved. Reference | Related Articles | Metrics

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Research on Cross-Section Overload Control Time of 500 kV Main Transformer after N-1 Fault KANG Long Hunan Electric Power    2022, 42 (4): 46-49.   DOI: 10.3969/j.issn.1008-0198.2022.04.009 Abstract （329）      PDF（pc） （1360KB）（263）       Knowledge map    Save In order to solve the problems of cross-section power exceeding limit and power supply capacity decreasing after N-1 fault, the characteristics and reasons of cross-section exceeding control time are analyzed, and the visualization method of pre-plan is put forward. By making the accident preplan of 500 kV main transformer failure in the graphical and batch control one cliok operation of the system, fast load transfer or cut-off under 500 kV failure is realized, it provides a reference for realizing fast control cross-section limit crossing when 500 kV main transformer fails. Reference | Related Articles | Metrics

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Heater Arrangement Method of 12 kV Switchgear Decondensation Based on Synthesizing Evaluation Function XU Junwei, SHU Shengwen, ZHAN Zhaoxuan, BIAN Zhiwen, LIN Yihong Hunan Electric Power    2023, 43 (2): 8-13.   DOI: 10.3969/j.issn.1008-0198.2023.02.002 Abstract （235）      PDF（pc） （2748KB）（207）       Knowledge map    Save In high humidity environment, the switchgear is easy to get damp and form condensation, resulting in a sharp decline in the insulation performance of the electrical equipment in the switchgear. In order to improve the ability of switchgear to cope with humid environment, this paper takes 12 kV high-voltage switchgear as an example to propose a comprehensive evaluation method of heater layout which considers temperature rise level, temperature rise uniformity and dehumidification capacity. Firstly, based on the comprehensive evaluation method of heater layout, the optimal heater layout test is carried out to select the optimal heater layout scheme. Then, the decondensation test is carried out on the basis of the optimal configuration test of the heater to verify the dehumidification performance of the heater layout scheme in the high humidity environment. Finally, combined with the numerical simulation of temperature-fluid multi-physical field, the distribution of temperature and flow field under the condition of heater installation is studied. The results show that the three 50W heater schemes are the best among the two selection strategies. The optimal heater arrangement scheme can completely remove condensation within 4.5h without causing excessive heating of insulation parts. Reference | Related Articles | Metrics

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Review of Icing Issues and Prevention and Control Technologies for Power Transmission and Transformation Insulators WANG Zhanxin, ZHANG Chuyan, YU Xinzhe, DENG Yu Hunan Electric Power    2025, 45 (6): 33-41.   DOI: 10.3969/j.issn.1008-0198.2025.06.005 Abstract （27）      PDF（pc） （9319KB）（12）       Knowledge map    Save Ice covering on insulators is a major natural disaster that poses a threat to the safe operation of power grids, especially posing a severe challenge to the high-altitude and heavily ice-covered areas that strategic projects such as the West-to-East Power Transmission pass through. For this reason, this article systematically reviews the core research progress in the field of insulator icing. Firstly, it elaborates on the physical mechanism of icing and the coupling influence laws of its interaction with water droplet movement, environmental parameters, and electric fields. Then, the flashover characteristics of icing insulators are analyzed to reveal their nonlinear voltage characteristics and the development process of arcs. Finally, it summarizes and evaluates the applicability and limitations of three types of anti-icing measures, that is, structural optimization, active de-icing, and passive protection. The article points out that current research still lacks in the aspects of microscopic icing physics, multi-physical field coupling models, and insulators adaptability in extreme environments. In the future, efforts should be focused on the construction of intelligent anti-icing technology and the construction of a full-chain risk early warning system to support the reliable operation of future power grids. Reference | Related Articles | Metrics

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Research on Grid Source Coordination Technology Problem in New Energy Power Station LIU Hui, XIE Wei, LI Chengshuai, GUO Feiyang Hunan Electric Power    2022, 42 (4): 81-84.   DOI: 10.3969/j.issn.1008-0198.2022.04.016 Abstract （313）      PDF（pc） （2350KB）（314）       Knowledge map    Save To build a new electric power system, it is necessary to solve the impact of new energy power stations on the stability of power systems, and improve the grid-source coordination performance of new energy sources.Based on the on-site grid-related test data, the test results of power quality, active and reactive power control performance, SVG performance, fault traversal performance and grid adaptability of the new energy power station are statistically analyzed.It is pointed out that the testing project of fault traversal performance and adaptability of power grid is the weak point of the current coordination and management of network sources of new energy field stations, and it should be the key work in the future.The typical problems of fault traversal and network adaptability are summarized and analyzed, and the corresponding countermeasures are put forward from the managerial and technical levels to support the transformation and development of power system. Reference | Related Articles | Metrics

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Study on Effects of Fuel Gas Parameters on Discharge Characteristics of Solid Oxide Fuel Cells LIU Hanyu, JI Xuanyu, ZHOU Xiong, YANG Yu Hunan Electric Power    2023, 43 (6): 31-36.   DOI: 10.3969/j.issn.1008-0198.2023.06.006 Abstract （277）      PDF（pc） （10371KB）（146）       Knowledge map    Save Solid oxide fuel cell (SOFC) technology is a clean and efficient power generation technology, and its high temperature characteristics make it easy to realize cogeneration, which has a good development prospect. In order to investigate the influence of different fuel gas parameters on the discharge characteristics of SOFC, a 500W SOFC experimental rig was built, and hydrogen discharge experiments, methane dry reforming discharge experiments, and durability experiments were conducted to analyze the influence of fuel gas flow rate and CH4/CO2 inlet ratio on the open-circuit voltage and electric power. The results show that with the increase of fuel flow, the open-circuit voltage of the battery, the power will increase, and the increase tends to stabilize at 2 L/min.When QCO2/QCH4=1∶1 and CH4 flow rate is 2 L/min, the methane dry reforming discharge performance is the best. When QCO2/QCH4=1.5, the SOFC discharge performance is less affected by the flow rate, and under this inlet ratio, it is more conducive to achieve low fuel flow rate and high current density discharge to maximize the SOFC discharge power. Reference | Related Articles | Metrics

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Neural Network Prediction Methods of Short-Term Peak Load Based on Multi-Information Fusion XU Shunkai, ZHU Jiran, TANG Haiguo, DENG Wei, HUANG Zhao, ZOU Changchun Hunan Electric Power    2024, 44 (1): 38-44.   DOI: 10.3969/j.issn.1008-0198.2024.01.006 Abstract （194）      PDF（pc） （5643KB）（196）       Knowledge map    Save In order to reduce the complexity of load data and improve prediction accuracy, an neural network model based on multi information fusion for short-term peak load is proposed on this article. The Pearson correlation coefficient is selected to analyze the closeness between weather information such as holidays, temperature, and humidity. In proposed model considering the key weather information fusion, the input load parameters is optimized,a new dataset of the neural network model is reconstructed, and overfitting of the neural networkis avoided,and the accuracy of short-term peak load prediction is improved. A simulation example of peak load forecasting proves that the proposed method is more effective in improving the accuracy of short-term peak load forecasting compared to the single enhanced decision tree model and neural network model that do not consider multiple information fusion. Reference | Related Articles | Metrics

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Power Coordination Control Strategy for Islanded Hybrid Microgrid Group Based on Droop Control ZHI Ming, YANG Fei, FU Rui, ZOU Jie, CHEN Xiao, XIA Lei, XU Xun Hunan Electric Power    2025, 45 (1): 130-135.   DOI: 10.3969/j.issn.1008-0198.2025.01.019 Abstract （131）      PDF（pc） （7399KB）（83）       Knowledge map    Save Interconnecting multiple AC/DC hybrid microgrids to form a hybrid microgrid cluster is a common way to supply loads, and how to utilize the autonomy of the sub-microgrids and realize the interactive power support between sub-microgrids is one of the key issues in AC/DC hybrid microgrid cluster power management. For this reason, this paper proposes a power management strategy consisting of three layers: power autonomy control layer of subgrids, power interaction support layer between neighboring subgrids, and power balance layer of the hybrid microgrid cluster for the AC/DC hybrid microgrid cluster with islanded operation. The coordinated control among the three layers can effectively improve the power supply reliability and quality of the isolated AC/DC hybrid microgrid cluster and reduce the power loss of the microgrid cluster. Finally, the proposed control strategy is verified by building an experimental platform, and the experimental results show that the proposed strategy has better robustness under normal communication and communication failure. Reference | Related Articles | Metrics

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Design and Implementation of Automatic Inspection Tool for Power Optical Transmission System ZENG Xiaohui, CHEN Xiaohui, ZHU Qing, LI Mingjuan, DU Mu′en Hunan Electric Power    2022, 42 (5): 79-84.   DOI: 10.3969/j.issn.1008-0198.2022.05.014 Abstract （260）      PDF（pc） （1820KB）（439）       Knowledge map    Save The optical transmission system is the carrier of the power service channel, and the current post-event passive fault repair operation and maintenance mode is not enough to meet the needs of the operation and maintenance work, while the traditional proactive hidden danger prevention mode is mainly manual periodic inspection, in which the optical path performance inspection needs a lot of manpower. In this paper, the abundant northbound interface of the dedicated network management is used to collect data, design the complete optical section object and the abnormal optical path judgment algorithm, develop the automatic inspection tool of the power optical transmission system, automatically output the inspection results, and give an early warning to the abnormal optical path, so as to find hidden dangers in time to avoid the occurrence of faults and improve the level of independent operation and maintenance. Reference | Related Articles | Metrics

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Optimization Strategy of Low Harmonic Content Trapezoidal Modulation for Quasi-Z-Source Inverter YI Wenjing, ZHANG Yang, YANG Yuxin, LUO Zhaoxu, CHENG Zhun Hunan Electric Power    2024, 44 (3): 96-104.   DOI: 10.3969/j.issn.1008-0198.2024.03.014 Abstract （209）      PDF（pc） （5807KB）（116）       Knowledge map    Save :A trapezoidal waveform-based optimization strategy is proposed in this paper to address the problems of harmonic pollution and high voltage stress on power devices in quasi-Z-source inverter. The modulation strategy improves the electrical energy quality by selecting the appropriate ladder shaping rate while ensuring the voltage utilization of the DC-link voltage and significantly reducing the total harmonic wave deformation of the quasi-Z-source inverter output current. In addition, the selection of a trapezoidal waveform as the modulating waveform can effectively reduce the voltage stress on the capacitors and power devices in the quasi-Z-source network. The proposed modulation strategy is simulated and analyzed using MATLAB/Simulink software to ensure its correctness and effectiveness. Finally, the trapezoidal waveform-based modulation strategy is further validated by the RT-LAB experimental platform. Reference | Related Articles | Metrics

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Research and Application Skid-Mounted Mobile Sub‍sta‍tions Intelligent Technology HU Tianxiang, LIU Jiantao, JIANG Qiang, LI Min Hunan Electric Power    2024, 44 (6): 55-60.   DOI: 10.3969/j.issn.1008-0198.2024.06.008 Abstract （308）      PDF（pc） （4485KB）（61）       Knowledge map    Save Aiming at the current problem of insufficient intelligence for skid-mounted mobile substations, a comprehensive solution based on the internet of things (IoT), big data analytics, and artificial intelligence(AI) is proposed. By introducing automation control and remote monitoring technologies, the substation’s capabilities in data acquisition, fault prediction, and energy management are enhanced. Experimental results show that the intelligent system significantly improves power supply reliability and operation and maintenanceefficiency while reducing costs. The intelligent strategies not only increase the adaptability of substations but also provide technical support for the construction of future smart grids. Reference | Related Articles | Metrics

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SOH Evaluation of Electrochemical Energy Storage Batteries Based on Operational Data GENG Mengmeng, FAN Maosong, GUAN Yibiao, WEI Bin Hunan Electric Power    2025, 45 (1): 8-13.   DOI: 10.3969/j.issn.1008-0198.2025.01.002 Abstract （193）      PDF（pc） （4921KB）（70）       Knowledge map    Save To address the issue of limited accuracy of state of health (SOH) of electrochemical energy storage batteries evaluation, firstly, through the analysis of data correlation, the voltage variation values in 10 minutes after the voltage reaches 3.25 V, 20 minutes before reaching 3.35 V and 30 minutes before reaching 3.4 V during the charging process are selected as health factors. These factors are utilized as input parameters of the model in a long short-term memory neural network optimized through genetic algorithms to facilitate SOH assessment for energy storage batteries. To validate the effectiveness of this evaluation method, five soft pack LiFePO4 batteries are subjected to cyclic aging experiments, obtaining health factors alongside actual SOH values for model development. The evaluation results are then compared with the actual SOH values obtained from testing. The evaluation results are quantified using mean square error (MSE) and mean absolute percentage error (MAPE), which shows that the SOH evaluation of the model is accurate,and MSE and MAPE are reduced by 48.3% and 74.1% respectively, compared with the unoptimized long short-term memory neural network. Reference | Related Articles | Metrics

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Research on Galloping Characteristics of Iced Overhead Conductor and Related Early Warning Technology WANG Wei, GUO Chenchen, LIU Zhiming, LI Zhipeng, CHANG Jidong, LI Peiyuan, LI Qiran Hunan Electric Power    2025, 45 (6): 42-49.   DOI: 10.3969/j.issn.1008-0198.2025.06.006 Abstract （31）      PDF（pc） （6251KB）（10）       Knowledge map    Save Aiming at the galloping problem of iced overhead conductors, a three-dimensional dynamic model of iced conductors is established based on the finite element simulation method, and the mechanical and electrical characteristics of conductor galloping under different wind speeds, wind directions, and airflow attack angles are systematically analyzed. The study finds that ice thickness and wind speed are the most sensitive parameters affecting galloping. On this basis, a galloping early warning system integrating 5G communication, sensor monitoring, and intelligent classification algorithms is proposed. The system employs an support vector machine (SVM) model to predict meteorological conditions prone to galloping in the area and combines an AdaBoost classifier to achieve a graded early warning for transmission line galloping risk. This system, with its multi-source perception and intelligent decision-making capabilities, effectively enhances the accuracy in early warning and prevention and control levels of the power grid against galloping disasters. Reference | Related Articles | Metrics

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Research on Fast Voltage Regulation Control Strategy for Wind Farm Based on GOOSE Communication GUO Chunling, CAI Guoyang, SHAN Xin, NIU Chao Hunan Electric Power    2022, 42 (5): 29-35.   DOI: 10.3969/j.issn.1008-0198.2022.05.005 Abstract （274）      PDF（pc） （1940KB）（364）       Knowledge map    Save In order to solve the problem of insufficient reactive power and voltage support capability of wind power generation, the reactive power and voltage support capability of wind turbine is analyzed firstly based on the characteristics of voltage sag and system impedance, the calculation method of total reactive power demand under voltage disturbance is proposed, finally generic object oriented substation event(GOOSE)rapid communication is introduced to construct the test environment in the wind farm, and the field test is carried out. The experimental results show that the strategy can provide fast reactive power and voltage support, and the response time can be reduced to less than 50 ms. Reference | Related Articles | Metrics

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Application of Creep Monitoring Device of Hydropower Unit Based on Magnetic Stripe Encoder WANG Kai Hunan Electric Power    2022, 42 (4): 60-63.   DOI: 10.3969/j.issn.1008-0198.2022.04.012 Abstract （369）      PDF（pc） （1504KB）（347）       Knowledge map    Save Based on the creeping phenomenon of hydraulic turbine generator set, this paper designs a set of creep monitoring device based on magnetic stripe encoder,which can sense the magnetic stripe through the encoder and send out pulse signals.After the PLC controller collects this pulse signal, it carries out PLC program processing and logic judgment.It can realize the creep signal monitoring of water turbine generator set with high cost performance, high precision and high reliability.At the same time, the protection program after unit creep is designed,to ensure the safe and stable operation of the unit. Reference | Related Articles | Metrics

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Control Strategy of LCL Grid-Connected Inverter Based on Improved Weighted Current Control LING Zhiyong, ZHOU Zhifei, LI Shengqing, YAO Hongde Hunan Electric Power    2023, 43 (2): 39-45.   DOI: 10.3969/j.issn.1008-0198.2023.02.007 Abstract （323）      PDF（pc） （4395KB）（459）       Knowledge map    Save Aiming at the problems that the traditional weighted average current (WAC)control strategy does not consider the digital control delay, and causes the phase lag of the system, which leads to the reduction of system bandwidth and poor robustness, the WAC control strategy of combination of quasi-proportional resonance control and lead compensator is proposed. Firstly, the capacitor current feedback is introduced to suppress the reverse resonance peak. Secondly, the lead compensator is connected in series at the transfer function of the inverter bridge to improve the phase margin of the system. Finally, the quasi-proportional resonant controller is used as a current regulator to Increase the fundamental frequency gain and reduce the static error of the system. It is verified by simulation that the proposed control strategy has good adaptability to weak power grids, and the harmonic distortion rate of grid-connected current is reduced from 1.84% to 0.26%, thereby enhancing the robustness of the system and improving the quality of grid-connected current. Reference | Related Articles | Metrics

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Research on Intelligent Auxiliary Monitoring System Based on Big Data Mining and Rule Engine ZHOU Hui, WANG Yao, LUO Renqiang, DANG Junbang, XIAO Zhenxin, ZHAO Hang Hunan Electric Power    2023, 43 (3): 77-81.   DOI: 10.3969/j.issn.1008-0198.2023.03.012 Abstract （430）      PDF（pc） （4526KB）（197）       Knowledge map    Save With the purpose of improving the intelligent level of power plant monitoring, this paper introduces an intelligent auxiliary monitoring system based on big data mining and rule engine, supported by big data technology and relying on various advanced machine learning algorithms. The system establishes the early warning model of all kinds of systems and equipment in power generation enterprises, which can accurately detect abnormal status of parameters and equipment, and reduce the monitoring pressure of operators. Early warning should be carried out in the early stage of equipment failure, and fault identification and troubleshooting guidance should be given to the early warning. The test results show that the system is beneficial to realize more comprehensive monitoring of equipment status in power plant, and it can further improve the operation level of units and the health level of equipment. Reference | Related Articles | Metrics

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Measurement and Simulation Analysis of Electrochemical Energy Storage Power Station Model HONG Quan, YANG Dan, XIONG Shangfeng, SUN Jieyi, LI Li, DING Yu Hunan Electric Power    2023, 43 (4): 80-84.   DOI: 10.3969/j.issn.1008-0198.2023.04.011 Abstract （255）      PDF（pc） （2336KB）（168）       Knowledge map    Save In order to broaden the application range of electrochemical energy storage in power grid regulation, and make full use of its advantages of flexible active and reactive power regulation and fast response speed, it is necessary to establish a model for power grid simulation analysis, which provides an analysis basis for electrochemical energy storage to participate in multiple scenarios such as peak shaving, frequency modulation, voltage regulation and transient reactive power support. In this paper, the measurement method of electromechanical simulation model of electrochemical energy storage power station is studied. Based on the parameter identification method of response characteristic matching and the field measurement characteristics, the simulation analysis model of an energy storage station in Hunan province is established, and its effect on improving the transient voltage characteristics of Hunan power grid is analyzed, which has certain engineering application value. Reference | Related Articles | Metrics

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A Quasi-Z-Source Inverter Modulation Strategy With Low Voltage Stress and Inductor Current Ripple YI Wenjing, LUO Chaokui, LUO Zhaoxu, CHENG Zhun Hunan Electric Power    2023, 43 (6): 45-53.   DOI: 10.3969/j.issn.1008-0198.2023.06.008 Abstract （161）      PDF（pc） （10422KB）（92）       Knowledge map    Save The quasi-Z-source inverter has the advantages of simple structure and continuous input current compared with the conventional Z-source inverter. However, the quasi-Z-source inverter with simple boost control has the problems of high voltage stress of power devices, high capacitor voltage of the quasi-Z-source network, and high inductor current ripple. In this paper, the mean signal is determined by averaging the highest and minimum values of the three-phase sinusoidal modulation signal in the simple boost control. Additionally, the mean signal is injected into the three-phase sinusoidal modulated waveform and employed in the quasi-Z-source inverter, which can effectively reduce the voltage stress of power devices and capacitors as well as the inductor current ripple. The comprehensive performance of the two modulation strategies applied to the quasi-Z-source inverter is compared by MATLAB/Simulink simulation and the RT-LAB experimental platform, and the feasibility and superiority of the proposed modulation strategy are verified based on the theoretical study. Reference | Related Articles | Metrics

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Application Research of Hydraulic Cavitation Technology for Oily Wastewater in Accident Oil Pool QIU Binbin, LI Guoyong, ZHANG Huadong, WANG Xiaohao Hunan Electric Power    2022, 42 (4): 106-109.   DOI: 10.3969/j.issn.1008-0198.2022.03.021 Abstract （298）      PDF（pc） （1515KB）（366）       Knowledge map    Save At present, in the field of oil-water separation and deep purification of oily wastewater in substation, there is no mature technology that can meet the standard discharge of oily wastewater with different concentrations and give consideration to high efficiency and economy. This paper proposes an oily wastewater treatment technology using hydraulic cavitation oil-water separation method coupled with ozone chemical technology. In the early stage, after removing most of the oil slick with hydrocyclone, the emulsified oil that is difficult to remove enters the hydraulic cavitation unit, and a small amount of floating oil and emulsified oil are oxidized into small molecular substances through the cavitation effect to be removed. At the same time, the ozone generated by the ozone generator can strengthen the oxidation reaction efficiency, improve the equipment treatment capacity and reduce the content of oil and organic matter in the subsequent effluent. By setting up an experimental platform and configuring oily wastewater with different oil content for test, the total oil content of oily wastewater can be significantly reduced to 5mg / L, which verifies the feasibility and efficiency of this technology. Reference | Related Articles | Metrics