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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
    Abstract612)      PDF(pc) (5562KB)(1958)       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.
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    Review of Key Technologies in New Power System Based on Artificial Intelligence Empowerment
    DUAN Junfeng, LI Chenkun, YAO Wenxuan, GUO Siyuan
    Hunan Electric Power    2024, 44 (1): 1-10.   DOI: 10.3969/j.issn.1008-0198.2024.01.001
    Abstract1276)      PDF(pc) (5512KB)(1197)       Save
    Based on the important role of artificial intelligence technology in promoting the intelligence of new power systems, this paper summarizes the current application status, technical challenges, and future development directions of artificial intelligence in new power systems. Firstly,the paper introduce the characteristics and requirements of the new power system. Then, the paper discusses the key application areas of artificial intelligence in new power systems, including the security, stability and control of large power grids, integrated collaborative analysis of source network, load storage, intelligent operation, inspection and management of power systems, as well as active distribution networks and microgrids. Finally, the paper analyzes the technical challenges faced by artificial intelligence in the new power system and proposes relevant suggestions.
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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
    Abstract292)      PDF(pc) (1165KB)(739)       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.
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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
    Abstract417)      PDF(pc) (5057KB)(666)       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.
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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
    Abstract367)      PDF(pc) (1104KB)(654)       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.
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    Remarks from Invited Editor in Chief
    LI Peng, SHU Shengwen, QIU Zhibin
    Hunan Electric Power    2024, 44 (3): 1-2.  
    Abstract112)      PDF(pc) (1569KB)(609)       Save
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    Research Progress on Safety Performance Improvement of Lithium-Ion Batteries
    HE Dan, HU Xiongxiong, CUI Hao
    Hunan Electric Power    2024, 44 (3): 25-33.   DOI: 10.3969/j.issn.1008-0198.2024.03.004
    Abstract461)      PDF(pc) (6708KB)(606)       Save
    :Aiming at the thermal runaway of lithium ion battery and fire fighting technology, the existing types of fire extinguishing agents are introduced, their fire extinguishing mechanism and advantages and disadvantages are analyzed, the mechanism and evolution process of thermal runaway of lithium ion battery are studied, and the future of lithium ion battery fire extinguishing agents is prospected.The research results show that these fire extinguishing agents meet the basic characteristics of extinguishing open fire when dealing with lithium-ion battery fires, but there are still different degrees of reignition risk, fire extinguishing time and flame retardant effect are not the same,in addition some fire extinguishing agents will have a negative impact on the environment and equipment after use. Therefore, the development of new fire extinguishing agents with high efficiency,environmental protection and anti-reignition characteristics is an inevitable trend of future research.
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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
    Abstract255)      PDF(pc) (2529KB)(567)       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.
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    Application of Distributed Energy Storage in Distribution Networkand Its Economic Evaluation
    ZHAO Yuting, LYU Dangzhen, WAN Dai, ZHAO Yongsheng
    Hunan Electric Power    2022, 42 (5): 53-59.   DOI: 10.3969/j.issn.1008-0198.2022.05.009
    Abstract371)      PDF(pc) (1120KB)(559)       Save
    According to the research and development and application status of distributed energy storage power station in distribution network, the application scenario and price system of distributed energy storage power station in distribution network are analyzed, and the principle of location and capacity selection of distributed energy storage power station in distribution network is put forward.This paper establishes a mathematical model for economic evaluation of distributed power stations in distribution network, makes economic evaluation based on an example of distributed energy storage power stations in distribution network,and proposes suggestions on improving the comprehensive benefits of distributed power stations in the distribution network.
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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
    Abstract267)      PDF(pc) (3308KB)(529)       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.
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    Design and Simulation of Equalization Circuit for Lithium-Ion Battery
    ZHU Hao, LIAO Honghui, E Jiaqiang, DENG Yuanwang
    Hunan Electric Power    2022, 42 (4): 28-32.   DOI: 10.3969/j.issn.1008-0198.2022.04.006
    Abstract380)      PDF(pc) (3032KB)(493)       Save
    In applications such as energy storage plants and pure electric vehicles, cell units are integrated in the battery pack in series and parallel,the battery packs may not be consistent with each other when in use, and this inconsistency can affect battery life and range. Aiming at this phenomenon, the paper designs the balanced topology circuit between the module and the module, analyzes the balanced principle of the designed circuit,builds the energy transfer model and the module internal balanced model in the Simulink/Simpowersystem, and simulates the equilibrium topology.The results show that the designed equalization system can realize the energy equalization of the battery.
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    Dielectric Properties and Structural Design of Main Insulation for Oil-Impregnated Paper Capacitive Bushing
    LIU Daosheng, ZOU Bin, CHEN Xingrong, WANG Shihui
    Hunan Electric Power    2023, 43 (2): 19-23.   DOI: 10.3969/j.issn.1008-0198.2023.02.004
    Abstract358)      PDF(pc) (2837KB)(488)       Save
    Oil-impregnated paper capacitive bushing, as one of the core current-carrying components of a transformer, has functions of support, current diversion and insulation. The insulation performance is crucial to the stability and safety of transformer operation. In order to reduce insulation faults caused by oil-paper partial discharge during the operation of oil-immersed paper bushings, this paper adopts nano-modulation technology to improve the dielectric and electrical properties of oil-immersed insulating paper for the main insulation of bushings. Taking 20 kV oil-paper capacitor bushing as the research object, a combination of simulation and experiment is used to investigate the effect of nanoparticles on the electric field distribution and partial discharge initial voltage of the main insulation of the casing core. The experimental results show that the nano-TiO2 particles can improve the surface microstructure of insulating paper, reduce the relative dielectric constant and the peak electric field intensity in the casing core, and increase the partial discharge initial voltage of the casing core. This provides a reference for improving the insulation performance of oil-paper capacitive bushings.
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    Detection Method of Metal Fitting Rust Defects for Overhead Transmission Lines Based on UAV Patrol of Deep Learning
    ZHANG Jiasheng, LIANG Jinxing
    Hunan Electric Power    2022, 42 (5): 75-78.   DOI: 10.3969/j.issn.1008-0198.2022.05.013
    Abstract572)      PDF(pc) (3274KB)(485)       Save
    In order to improve the efficiency of UAV inspection of overhead lines and the intelligent detection efficiency of rust defects of overhead line metal fitting, a deep learning-based inspection method for rust defects of overhead lines metal fitting is proposed. Due to the characteristics of large environmental background, small target, and large difference in shooting angle and shooting light in the intelligent detection of metal fittings rust defects of overhead transmission lines, this paper uses image preprocessing algorithm to expand the data set. And YOLO is replaced by MobileNet′s backbone feature extraction network to improve the generalization ability and robustness of the algorithm, and the actual inspection images are used for experimental testing. In the test set validation, when the confidence threshold is 0.5, the P value is 0.92, the R value is 0.84, and the AP value is 91.34%. The results show that this method has a good detection effect on the rust defects of overhead line metal fittings, and can provide reference for the assessment of equipment health status.
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    Fault Analysis and Management of Feedwater Pump Turbine Shaft Sealing System for a 1 000 MW Unit
    YU Xinggang, WEI Haifeng, ZHU Taichun, GUO Xuhong, JIANG Bohua
    Hunan Electric Power    2022, 42 (5): 119-122.   DOI: 10.3969/j.issn.1008-0198.2022.05.021
    Abstract276)      PDF(pc) (1475KB)(480)       Save
    A 1 000 MW unit in a newly-built coal-fired power plant adopts a steam-driven feed water pump with a capacity of 100% boiler maximum continuous rating. During commissioning, the shaft seal system of the feed water pump turbine of this unit has the faults of water entrainment of shaft seal steam and abnormal noise of the shaft seal pipe at the side of the feed water pump. Through adjustment and analysis, it is found that the causes of the above-mentioned failures are unreasonable design of shaft seal steam return pipe and imperfect installation of shaft seal steam pipe sleeve in condenser. The fault of shaft seal system of feed water pump turbine has been successfully solved by installing hydrophobic water seal cylinder at the lowest point of shaft seal steam return pipeline and installing heat insulation on shaft seal steam pipeline in condenser.
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    Research of Insulation Monitoring Methods for Electric Vehicle Power Battery Pack
    DENG Yuanwang, YIN Huichun, E Jiaqiang, LIU Shuai, ZHU Hao
    Hunan Electric Power    2023, 43 (1): 46-49.   DOI: 10.3969/j.issn.1008-0198.2023.01.008
    Abstract365)      PDF(pc) (3081KB)(473)       Save
    As the demand for battery pack energy storage continues to increase and its voltage plateau rises, the real-time monitoring of the insulation performance of high-voltage systems becomes more and more important. In this paper, several common methods of insulation resistance detection are analyzed, the insulation resistance detection method of the balanced-unbalanced bridge is proposed, and Multisim is used to build a whole vehicle insulation simulation model to analyze the feasibility of the insulation resistance detection method of a balanced-unbalanced bridge.
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    Day-Ahead Scheduling of Integrated Electric Heating System Considering Thermal Inertia
    DAI Mengdi, KE Deping, SONG Lin, WANG Huiji
    Hunan Electric Power    2023, 43 (2): 32-38.   DOI: 10.3969/j.issn.1008-0198.2023.02.006
    Abstract265)      PDF(pc) (2463KB)(469)       Save
    For the problem of optimal scheduling of integrated energy systems involving wind power consumption, a stochastic optimal scheduling strategy with systematic consideration of mixed uncertainties is proposed by mining multiple thermal inertia. The thermal inertia of the network based on the dynamic characteristics of the heat network and the thermal storage characteristics is explored, the thermal load elasticity constraint is introduced into the modeling of thermal inertia of buildings, and heat pumps and thermal storage are used as time-shiftable electric loads and heat sources, which are jointly modeled with CHP units to solve the peak-valley mismatch of electric and thermal loads.On this basis, the IES model considering multiple thermal inertia is established, the coupled system of 33-node heat network and 9-node grid is used as an example for the analysis. And the traditional heuristic particle swarm algorithm with the mixed integer nonlinear programming algorithm is compared. The results show that by mining the multiple thermal inertia to broad the flexibility of the energy system, the complementary aid and flexible dispatch between multiple heterogeneous energy sources can be realized, and the mathematical planning algorithm can effectively improve the solving efficiency far than the particle swarm algorithm.
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    Analysis and Research of On-Line Energy Consumption Monitoring Model for Thermal Power Units
    NIE Tao, SHAO Feng, YANG Wenzheng, HE Xinrong , WANG Zhong′ao
    Hunan Electric Power    2023, 43 (2): 60-65.   DOI: 10.3969/j.issn.1008-0198.2023.02.010
    Abstract269)      PDF(pc) (1192KB)(466)       Save
    Because of the limitation of on-line energy consumption measurement condition and instrument measurement precision, the coal consumption of on-line monitoring system usually has big error.To solve this technical problem, this paper adopts the state equation of thermal economy of power plant to dynamically solve the steam turbine heat rate, applying the idea of energy mass balance, the steam water distribution matrix equation of the whole thermal system is established.At the same time, the dynamic fluctuation characteristics of boiler efficiency are deeply studied, the factors of coal quality ash and heat dissipation are analyzed , the theoretical calculation models of exhaust heat loss, solid incomplete combustion heat loss and heat dissipation loss are established.For the dynamic calculation of auxiliary power consumption rate, the emphasis is on the accuracy of the electric meter and the allocation method of the public part of the power supplied to the factory. The online calculation accuracy of the unit energy consumption model is verified and the test results show that the on-line energy consumption calculation and monitoring model can meet the accuracy requirements of ASME standards.
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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
    Abstract321)      PDF(pc) (4395KB)(457)       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.
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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
    Abstract257)      PDF(pc) (1820KB)(437)       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.
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    10 kV Feeder Load Forecasting Method Based on Double Layer Mapping
    GUO Lu, LIU Yongli, LI Longfei, HE Ming, YANG Huimin, ZHANG Yuan, WU Qian
    Hunan Electric Power    2023, 43 (2): 71-78.   DOI: 10.3969/j.issn.1008-0198.2023.02.012
    Abstract283)      PDF(pc) (1788KB)(415)       Save
    Feeder load is very important for distribution system planning, safe operation, equipment maintenance and load analysis, etc. This paper uses the spatial load forecasting method to indirectly realize electrical load forecasting, which is suitable for the load forecasting of 10 kV feeders under the situation that the purpose of spatial land is clear, the historical data of parcel load is sufficient, but the historical data of feeder electrical load is relatively lacking. According to the“component-parcel”spatial membership relationship, the micro electrical load forecasting based on the feeder segment is indirectly realized by means of the spatial parcel load forecasting, and further summarizes the medium and long-term loads of the entire 10 kV feeder line. The core idea is to first map the electrical load of the current year to the spatial load, and then obtain the spatial load of the required planning year through the spatial load prediction, and then map the spatial load of the planning year to the electrical load, and finally summarize the predicted load of the feeder. The results of the example are compared with the existing mainstream forecasting methods and the actual load collection data respectively. It shows that the proposed model and calculation method meet the accuracy requirements of distribution network planning, and it is practical and effective.
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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
    Abstract243)      PDF(pc) (1492KB)(394)       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.
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    Research and Implementation of Synchronous Space Vector Modulation Algorithm for Photovoltaic Direct Drive Air Conditioner
    LIN Baowei, YANG Maotao, ZENG Wenwei, ZHAO Zhigang, LIN Jing
    Hunan Electric Power    2020, 40 (4): 1-6.   DOI: 10.3969/j.issn.1008-0198.2020.04.001
    Abstract334)      PDF(pc) (3528KB)(384)       Save
    This paper studies the synchronous space vector modulation (SVPWM) algorithm of photovoltaic direct-drive air conditioners, and gives the implementation scheme of synchronous modulation. And the effectiveness of the synchronous modulation scheme is verified by simulation.Finally, by applying SVPWM modulation in the vector control system of permanent magnet synchronous motor, the stability of the modulation method in closed-loop control with low switching frequency is verified.
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    Analysis of A Ring Network Fault Caused by DC Wiring Error
    GAO Yan
    Hunan Electric Power    2022, 42 (3): 109-112.   DOI: 10.3969/j.issn.1008-0198.2022.03.020
    Abstract232)      PDF(pc) (2619KB)(373)       Save
    The insulation level of DC system is often damaged due to aging of power cable insulation, damaged construction, damp accumulation and faulty wiring, which affects the safe and stable operation of units. In the light of the phenomenon that two sets of DC insulation monitoring devices are given an alarm at the same time but both sets of DC bus voltage are normal during the operation of unit 2 of a power plant, it is found that there is a loop network fault in the DC system, and this phenomenon is theoretically analyzed, the fault rules of DC system loop network are summarized, and some suggestions for reliable operation of DC system are put forward.
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    Capacity Optimization Configuration of Grid-Connected Wind-Solar-Hydrogen-Storage Microgrid
    ZHAO Na, ZHANG Lian, WANG Shibin, LI Duo, HUANG Wei
    Hunan Electric Power    2023, 43 (4): 48-55.   DOI: 10.3969/j.issn.1008-0198.2023.04.007
    Abstract259)      PDF(pc) (1469KB)(366)       Save
    A single type of energy storage device is difficult to take into account the advantages of multiple types of energy storage devices, while the hybrid energy storage system can integrate the technical and economic advantages of different types of energy storage. Aiming at the optimal configuration of hybrid energy storage based on battery and hydrogen energy storage in grid-connected mode, economic and environmental protection are taken as the objective function, the analytic hierarchy process is used to solve the multi-objective weight problem, and the particle swarm optimization algorithm is used to solve the optimal configuration of microgrid capacity. Different energy storage configuration schemes are analyzed and compared by economy and evaluation index. The results show that the cost of hybrid energy storage is 2.46% and 10.02% lower than that of single battery and hydrogen energy storage. The self-balancing rate is 7.65% and 23.89% higher than that of single battery and hydrogen energy storage, and the redundancy is 19% and 38.16% lower than that of single battery and hydrogen energy storage.
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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
    Abstract298)      PDF(pc) (1515KB)(364)       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.
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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
    Abstract300)      PDF(pc) (4301KB)(364)       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.
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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
    Abstract274)      PDF(pc) (1940KB)(362)       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.
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    Application of Electro-Regeneration Ion Exchange Technology in On-Line Measurement of Hydrogen Conductivity
    GU Zhenyang, LI Limin, HE Yuning, SUN Jihui, LI Chenghao, DONG Weihu, DAI Xin , YANG Jeili
    Hunan Electric Power    2022, 42 (5): 64-68.   DOI: 10.3969/j.issn.1008-0198.2022.05.011
    Abstract300)      PDF(pc) (2409KB)(358)       Save
    Conventional online measurement method of hydrogen conductivity uses cation exchange resin column for pretreatment, and when the cation resin fails, it needs to be regenerated. This work not only consumes labor, but also easily introduces additional errors of exchange column, which reduces the accuracy of hydrogen conductivity measurement. To solve the above problems, the electric regeneration ion exchange technology is applied to the online measurement of hydrogen conductivity, and the hydrogen conductivity meter does not need to be replaced or regeneration of resin in the follow-up maintenance work, thus realizing the continuous online accurate measurement of hydrogen conductivity. The application results of regenerative ion exchange technology in online measurement of hydrogen conductivity show that this technology can save a lot of manpower and improve the accuracy and continuity of online measurement of hydrogen conductivity.
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    Prediction of Power Transmission Project Cost Trend Based on Big Data
    DENG Yiqing, SUN Bin, LI Xiaobing, LI Dan, WANG Rongjing
    Hunan Electric Power    2023, 43 (2): 108-111.   DOI: 10.3969/j.issn.1008-0198.2023.02.018
    Abstract372)      PDF(pc) (1317KB)(353)       Save
    In order to accurately predict the cost of power transmission and transformation projects, control the cost investment in the construction stage, and improve the utilization rate of funds,based on the actual cost data of power transmission and transformation projects in different cities in Shaanxi province, the key influencing factors of power grid project cost are screened by using the entropy weight method, and the BP neural network forecasting model is used to predict the cost of transmission and transformation projects effectively. The forecasting results confirm the validity of the model.
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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
    Abstract368)      PDF(pc) (1504KB)(343)       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.
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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
    Abstract283)      PDF(pc) (2729KB)(336)       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.
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    Cause Analysis and Preventive Measures of Wind Turbine Blade Tower Sweeping
    LUO Yanfei, XIAO Changyuan , SUN Maowen, LUO Shengxi, ZHANG Hualian
    Hunan Electric Power    2023, 43 (1): 116-120.   DOI: 10.3969/j.issn.1008-0198.2023.01.020
    Abstract616)      PDF(pc) (4564KB)(336)       Save
    In recent years, there have been a number of blade tower sweeping failures of wind turbine in China, which have seriously affected the safe operation of wind turbines, and also brought a lot of economic losses. This paper analyzes the causes of blade tower sweeping failure in a wind farm from the aspects of clearance design, hoisting maintenance, blade quality, unit operation control, site adaptability, simulation restoration, etc. It is determined that the blade tower sweeping in the wind farm are caused by turbulence overrun, negative shear, and blade installation angle dislocation. Preventive measures are given for different tower sweeping causes, and some suggestions are put up for the clearance design of new models.
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    Influence and Optimization of Shielding Fitting on Voltage Distribution of Series Multi-break Mechanical Switch of Hybrid Circuit Breaker
    WANG Huaqing, HUANG Daochun, SHUANG Mingjing, Li Huipeng, CHEN Xin, QIU Yiqun
    Hunan Electric Power    2022, 42 (4): 1-6.   DOI: 10.3969/j.issn.1008-0198.2022.04.001
    Abstract349)      PDF(pc) (2403KB)(335)       Save
    In order to study the influence of shielding fitting on the voltage distribution of series multi-break mechanical switch of hybrid DC circuit breaker, and provide support for the voltage sharing design of fast series multi-break mechanical switch of hybrid HVDC circuit breaker, a typical ±200 kV hybrid DC circuit breaker model is established in this paper. The influence of the power electronic module, the energy absorption module and the shielding fitting on the voltage distribution characteristics of the break of the fast mechanical switch is analyzed by using the electrostatic field simulation, especially the influence of the structural parameters and arrangement of the shielding fitting on the voltage distribution characteristics of the break. The results show that the shielding fitting has the greatest influence on the voltage distribution between the breaks, the voltage distribution between the breaks can be effectively improved by means of the completely enclosed structure of the top layer shield, and reduce the distance between the top layer shield and the fast mechanical switching unit. Based on the simulation results, the structure parameters and arrangement mode of ±200 kV hybrid shielding DC circuit breaker fitting are optimized, the optimized voltage percentage of the high voltage side break decreases from 59.97% to 52.32% and it shows the effectiveness of the optimization measures. The results of this paper can provide a reference for the design of voltage sharing design of series multi-break mechanical switches for hybrid DC circuit breakers.
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    Electrodynamic Calculation of Cable Short Circuit Based on Finite Element Electromagnetic Simulation
    XU Binbing, CHEN Ziyao, LIU Yubin, LEI Jiacheng, QIN Rui, YANG Xin
    Hunan Electric Power    2023, 43 (1): 23-29.   DOI: 10.3969/j.issn.1008-0198.2023.01.004
    Abstract449)      PDF(pc) (6715KB)(330)       Save
    When a short-circuit fault occurs in the cable line, the mechanical properties of the cable bracket and hardware will be threatened under the action of short-circuit electric power. The traditional method of calculating cable short-circuit electric force is formula method. The formula method can only calculate the maximum short-circuit electric force, and there are limitations such as single solution object and inability to reflect the change of force with time. In this paper, the finite element calculation method based on electromagnetic coupling is used to establish the finite element calculation model of cable short-circuit electrodynamic force. Based on Maxwell 's electromagnetic theory and Gauss divergence theorem, the transient electromagnetic field analysis of the cable is carried out, and the change of short-circuit electrodynamic force on the cable with time is obtained. Compared with the calculation results of the formula method, there is only 2.11% error. The results show that the calculation method of short-circuit electrodynamic force based on finite element electromagnetic simulation can intuitively obtain the distribution and vibration frequency of electrodynamic force at each moment during short circuit. The electrodynamic calculation method of finite element electromagnetic simulation can be applied to short-circuit analysis of other fault types.
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    Development of Mobile Energy Storage Vehicle Based on Super Capacitor Battery
    WU Chuanping, ZHOU Tiannian, LIU Yu, ZHU Hongzhang
    Hunan Electric Power    2023, 43 (2): 66-70.   DOI: 10.3969/j.issn.1008-0198.2023.02.011
    Abstract313)      PDF(pc) (5822KB)(325)       Save
    Aiming at a new type of mobile energy storage vehicle using electrical double-layer capacitor, this paper introduces the electrical double-layer capacitor characteristics, the structure of mobile energy storage vehicle and the electrical double-layer capacitor package assembly scheme, puts forward the control method and working mode of energy storage power converter, designs the fire protection system of the device, and carries out the functional test on electrical double-layer capacitor mobile energy storage vehicle. The test results show that electrical double-layer capacitor mobile energy storage vehicle runs well in charging, discharging and islanding mode when connected to the grid, with high energy conversion efficiency and good application prospects.
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    Control Technology of Ammonium Bisulphate In Denitrification of SCR Flue Gas after Ultra-Low Emission Transformation of Coal-Fired Unit
    ZHAO Guangyao, HUANG Quanhao, ZHU Yingjian, DU Shengxiang
    Hunan Electric Power    2022, 42 (5): 101-106.   DOI: 10.3969/j.issn.1008-0198.2022.05.018
    Abstract287)      PDF(pc) (2614KB)(320)       Save
    This paper introduces the mechanism of ammonium bisulfate generation, points out the harm of ammonium bisulfate to boiler equipment, analyzes the influencing factors of ammonium bisulfate generation, studies the harm of ammonium bisulfate to boiler equipment after ultra-low emission transformation, and puts forward specific methods to control the amount of ammonium bisulfate generation according to its characteristics.
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    Hunan Electric Power    2023, 43 (2): 1-2.  
    Abstract140)      PDF(pc) (1027KB)(314)       Save
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    Effect of Organic Pollutant Infiltration on Anti-Flashover Performance of Methyl Silica Superhydrophobic Coatings
    WANG Shengwu, ZOU Qiaoge, LI Li, CHEN Junwu, XIE Yi
    Hunan Electric Power    2023, 43 (2): 3-7.   DOI: 10.3969/j.issn.1008-0198.2023.02.001
    Abstract230)      PDF(pc) (3667KB)(314)       Save
    The deposition and infiltration of organic pollutants on the surface of methyl silica superhydrophobic coatings will lead to a decrease in the self-cleaning properties of the coatings, which in turn will lead to a decrease in the insulation strength of the coatings under dirty and wet environmental conditions. There is a lack of research on the effect of organic fouling on the insulation strength of methyl silica superhydrophobic coatings. The insulation strength of the coating samples under dirty and wet conditions is reflected by measuring the leakage current amplitude of the coating samples after they are wetted with alkane organic substances in different degrees and ways. The results show that the leakage current amplitude of the surface of methyl silica superhydrophobic coating increases by more than 50% when the infiltration area of organic pollution is increased to 3 times under the experimental conditions. The leakage current amplitude of the coating is decreased by about 16% by increasing the dispersion degree of organic pollution sites. Under the experimental conditions of heavy organic infiltration, the static contact angle and rolling angle of methyl silica super-hydrophobic coating drops are decreased by 10° and increased by more than 7° respectively.
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    Design and Simulation of Power Supply-Traction-Hybrid Energy Storage System for Urban Rail Trains
    ZHU Zhiqiang, WANG Xin, QIN Bin
    Hunan Electric Power    2024, 44 (1): 24-31.   DOI: 10.3969/j.issn.1008-0198.2024.01.004
    Abstract494)      PDF(pc) (7016KB)(314)       Save
    In order to further improve the recovery and utilization efficiency of urban rail train regenerative braking energy, a structure of urban rail train traction power supply system based on distributed ground hybrid energy storage is designed through the analysis of system functional requirements, and the power supply network, train traction and energy storage system models are established. Moreover, aiming at the problem that low pass filtering leads to a large amount of power exchange between lithium batteries and supercapacitors, a stepped power allocation method with supercapacitor compensation is proposed.This method has small computation and strong real-time performance,and can avoid the internal power circulation of the hybrid energy storage system. Combined with the proposed model and strategy, MATLAB Simulink is used to simulate.The results validate that the energy utilization efficiency of the hybrid energy storage system is improved by 1.39%, the voltage regulation rate is increased by 12.75% and the energy saving rate is increased by 6.72%.
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    Research on Monitoring and Management of Wind Power Generation Capacity in Hunan Power Grid
    CHEN Haoqi, WU Yuxiang, FAN Jiahong, QIAN Jun, CHEN Bin, ZHU Shu, ZHANG Jinfan
    Hunan Electric Power    2023, 43 (2): 97-101.   DOI: 10.3969/j.issn.1008-0198.2023.02.016
    Abstract463)      PDF(pc) (4797KB)(311)       Save
    In view of the current situation and existing problems of wind power capacity monitoring technology in Hunan power grid, a wind power capacity monitoring algorithm and system architecture based on abnormal data identification are proposed. The feasibility of the algorithm is verified by historical data, which realizes real-time monitoring of wind power plant capacity and automatic detection and identification of wind power plant abnormal data.Based on the monitoring system, the supporting management suggestions are put forward to scientifically guide the improvement of the wind power management level of Hunan power grid, which can improve the wind power supply support ability and promote the development of wind power anti-ice technology.
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