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Cause Analysis on Copper Shield Burst of 110 kV Cable Joint LI Shaobin, XIE Shilin, PENG Yong, TANG Wenbo, ZHOU Hai, FAN Fangkun Hunan Electric Power    2023, 43 (1): 121-126.   DOI: 10.3969/j.issn.1008-0198.2023.01.021 Abstract （469）      PDF（pc） （7716KB）（79）       Knowledge map    Save The copper shield burst caused by short-circuit breakdown of cable joints is prone to fire hazards in cable tunnels. This paper analyzes a typical 110kV cable joint copper shield burst accident and proposes that the copper shield burst of cable joints is caused by the compound action of two types of states, high temperature and high pressure, and the short-circuit breakdown process is accompanied by the cracking and ionization of insulating materials. The above viewpoint is verfied throgh the short-circuit high-current simulation test of the designed cable joint verifies the above viewpoint, the effectiveness of the current market mainstream use of the cable joint explosion-proof method is analyzed, and the design elements of the cable joint fireproof and explosion-proof are proposed. Reference | Related Articles | Metrics

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Forecast of Daily Maximum Load of Distribution Network Based on Hausdorff Shape Clasification ZHOU Wangfeng, LI Yong, GUO Yixiu, QIAO Xuebo, DENG Wei, LUO Weicheng Hunan Electric Power    2021, 41 (1): 1-5,10.   DOI: 10. 3969/j. issn. 1008-0198. 2021. 01.001 Abstract （354）            Knowledge map    Save The accurate prediction of daily maximum load and its occurrence time are the focus of economic dispatch and safe operation of distribution network. This paper studies the internal law of daily maximum value and its occurrence time of various types of load,and proposes a forecasting method of daily maximum load and its occurrence time combined with Hausdorff load shape classification and holiday correction in the same period of last year. Firstly， the shape characteristics of daily load are analyzed, and the load types are classified by Hausdorff distance algorithm. Then, the corection effect of holidays in the same period of last year in the prediction of daily maximum load and its occurrence time are analyzed, and it is used as the forecast input together with the recent daily load, temperature and other data. Finally, based on ElasticNet regression algorithm, the daily maximum load and its occurrence time prediction model are constructed for each type of load. Taking the load data of a certain station area in Hunan province as an example, the daily maximum load and its occurrence time in the Spring Festival of the station area are predicted and the accuracy and effectiveness of the method are verified in an example. Related Articles | Metrics

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Research on Residential Peak-Valley Time-of-Use Electricity Price Scheme for in Hunan Province HUANG Minqi, DAI Dandan, ZHANG Li, LIAO Jing, PAN Xin Hunan Electric Power    2023, 43 (6): 63-67.   DOI: 10.3969/j.issn.1008-0198.2023.06.010 Abstract （314）      PDF（pc） （4115KB）（23）       Knowledge map    Save Aiming at the problem of power grid consumption structure in Hunan Province, the strategy of residential time-of-use electricity price scheme is proposed. Based on the residential electricity load data, the hierarchical clustering method is applied to divide the peak and valley periods of residents. Based on the heterogeneity of residential electricity demand, a demand price elasticity model is constructed, and on the basis of the current residential tiered electricity price policy, and with the goal of peak shaving and valley filling, a peak-valley time-of-use electricity price scheme for residents in Hunan Province is formulated. Reference | Related Articles | Metrics

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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 Abstract （246）      PDF（pc） （4564KB）（197）       Knowledge map    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. Reference | Related Articles | Metrics

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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 （237）      PDF（pc） （5562KB）（388）       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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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 Abstract （230）      PDF（pc） （5512KB）（405）       Knowledge map    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. Reference | Related Articles | Metrics

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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 Abstract （215）      PDF（pc） （3528KB）（316）       Knowledge map    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. Reference | Related Articles | Metrics

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Development Status and Trend Analysis of Standard Digitization in Power Grid Enterprise ZHANG Lan Hunan Electric Power    2023, 43 (1): 95-98.   DOI: 10.3969/j.issn.1008-0198.2023.01.016 Abstract （209）      PDF（pc） （3656KB）（123）       Knowledge map    Save Standard digitization transformation facilitates standards in power grid enterprise to be more efficient, transparent, cooperative and smart, and will also make standard digitization in power grid to guide,regulate and support a healthy and ordered development of digital transformation in power grid. Based on the background of standard digitalization, this paper introduces the characteristics and status quo of standard digitalization of power grid enterprises, sorts out the problems faced by the standard digitalization of power grid enterprises, and analyzes the development trend of the standard digitalization of power grid enterprises.Some suggestions on the standardization and digitization of power grid enterprises are put forward. Reference | Related Articles | Metrics

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Hunan Electric Power    2020, 40 (6): 84-.   Abstract （198）            Knowledge map    Save Related Articles | Metrics

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Application of Coal Consumption Prediction Based on Least-Squares Procedure in Economy Evaluation of Peak-regulating XIAO Zhibo, WANG Lei, YUAN Xu, SIMA Boyong, JIANG Lei Hunan Electric Power    2021, 41 (1): 6-10.   DOI: 10.3969/i. issn. 1008-0198. 2021.01.002 Abstract （197）            Knowledge map    Save In this paper, the coal consumption data matching each load rate of the 300MW generating unit of a power plant in the past year are screened and preprocessed ，and the coal consumption prediction model of the generator unit is given by using the curve fitting method based on the least square principle. Then，the actual benefit difference per hour under two conditions of participating in peak - regulating and no participating in peak- regulating is taken as the objective function ，and the minimum compensation price is calculated ，which provides a reference for the decision - making of power plant peak load regulation bidding. Finally, the influence of coal consumption and peak - regulating load ratio on the economy of the power plant is analyzed. Related Articles | Metrics

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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 Abstract （188）      PDF（pc） （3274KB）（321）       Knowledge map    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. Reference | Related Articles | Metrics

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Measures of Performance Optimization and Improvement of Three-Phase Inconsistent Protection for Circuit Breaker GUO Yang, CHEN Hao, GAO Shiyu, GU Hao, LI Yifeng Hunan Electric Power    2022, 42 (5): 90-94.   DOI: 10.3969/j.issn.1008-0198.2022.05.016 Abstract （185）      PDF（pc） （4167KB）（109）       Knowledge map    Save Based on the typical secondary circuit, this paper introduces the principle of three-phase inconsistent protection in high-voltage power system, analyzes the causes of protection maloperation from the aspects of circuit insulation fault, artificial factors, improper setting of pressure plate and so on, and puts forword the optimization and improvement measures. The application practice shows that the optimized measures are feasible and effective, and the performance of three-phase inconsistent protection is greatly improved. Reference | Related Articles | Metrics

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Fault Location of Distribution Network Hierarchical Model Based on Improved Whale Algorithm ZHANG Shangde, ZHANG Lian, ZHAO Mengqi, JIA Hao, XIE Wenlong, JI Hongyu, HUANG Wei Hunan Electric Power    2023, 43 (1): 1-7.   DOI: 10.3969/j.issn.1008-0198.2023.01.001 Abstract （164）      PDF（pc） （5596KB）（121）       Knowledge map    Save After a large number of distributed power sources are connected to the distribution network, the dimension of the network structure and the uncertainty of the power flow direction when a fault occurs are increased. In view of the information distortion and the complexity of fault location when collecting or uploading fault current information, a fault location solution method is proposed, which establishes a mathematical model according to the network structure of distribution network, constructs a hierarchical model with the idea of hierarchical simplification, greatly reduces the variable dimension of distribution network, constructs a switching function and adds fault auxiliary criteria, and then improves the whale algorithm by population distribution, adaptive weight adjustment and cross-border treatment. The simulation results show that the proposed method can accurately locate the fault section and improve the efficiency and accuracy of distribution network fault solution under various working conditions, such as single fault, multiple faults, distorted current information or switching state of distributed generation. Reference | Related Articles | Metrics

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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 Abstract （162）      PDF（pc） （4797KB）（178）       Knowledge map    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. Reference | Related Articles | Metrics

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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 Abstract （160）      PDF（pc） （1120KB）（228）       Knowledge map    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. Reference | Related Articles | Metrics

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Deadbeat Control of LCL Photovoltaic Inverter Based on Compound Prediction LI Shengqing, YAO Xin, FENG Haotian, ZHANG Dong, TANG Xinyun Hunan Electric Power    2022, 42 (4): 40-45.   DOI: 10.3969/j.issn.1008-0198.2022.04.008 Abstract （159）      PDF（pc） （2697KB）（104）       Knowledge map    Save Aiming at the problems of time delay and low prediction accuracy of traditional deadbeat control, a deadbeat current control based on composite prediction is proposed. This method first analyzes the reasons for the time delay and low prediction accuracy. Then, when the load is stable, Lagrange interpolation method and repeated prediction are combined to improve the current prediction accuracy. When the load changes, adaptive forward linear current prediction is introduced to shorten the system oscillation time and enhance the dynamic response ability. Finally, the two methods are combined for control. The inverter output current is predicted one beat in advance and the sampling reference current is predicted two beats in advance, which solves the problem of time delay. The simulation results show that this method reduces the harmonic content by 92% and the oscillation time by 50% compared with that before compensation. It has higher prediction accuracy and dynamic response ability, and better control effect. Reference | Related Articles | Metrics

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Research on Demand Side Response for Large Industrial Load in Hunan Province WU Yefan, CHEN Jin, ZHANG Mi, LIU Haotian, DENG Kai, LI Dawei Hunan Electric Power    2020, 40 (4): 7-12.   DOI: 10.3969/j.issn.1008-0198.2020.04.002 Abstract （159）      PDF（pc） （1940KB）（115）       Knowledge map    Save Regarding the problem of the time difference and seasonal differences of power demand in Hunan province in recent years, this article will combine the latest domestic and foreign latest research results demand response theory to investigate and research the large industrial load with huge power consumption. Based on the division of major industrial sectors in Hunan province, the work of each industry category and the ability are investigated to implement demand response. Then the theory and model are optimized from the aspects of peak and valley division and real-time electricity price. Finally, the optimization results of real-time data of Hunan province's large industry are given by means of origin simulation software. 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 （158）      PDF（pc） （5057KB）（170）       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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Three-Phase Load Imbalance Management Method Based on Improved Knapsack Algorithm for Manual Phase Change Station Area ZHAO Ruolan, JIANG Fei, HE Zhenwu, YAO Peng, GUO Qi, PEI Xiangyu Hunan Electric Power    2023, 43 (1): 103-109.   DOI: 10.3969/j.issn.1008-0198.2023.01.018 Abstract （158）      PDF（pc） （5847KB）（120）       Knowledge map    Save In view of the high degree of three-phase unbalance in the distribution station area and the low efficiency of the traditional manual phase change, a manual phase change optimization method based on the improved knapsack algorithm is proposed. The multi-objective phase change optimization model is constructed by considering the degree of three-phase unbalance and the number of phase changes. The phase change problem is abstractly transformed into a multi-pack model, and the algorithm is improved by introducing the idea of layered partitioned parallel search (LPPS). The actual data of a residential distribution area are used to analyze the case, and the improved knapsack algorithm is used to calculate the phase change scheme of the distribution area. Compared with the traditional knapsack algorithm, the number of phase changes is reduced while ensuring the treatment effect, which is conducive to improving the economic operation efficiency of the distribution area. Reference | Related Articles | Metrics

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An On-Line Voltage Stability Assessment Method based on Particle Swarm Optimization Support Vector Regression Prediction LI Shuaihu, ZHAO Xiang , JIANG Yunchen Hunan Electric Power    2022, 42 (5): 22-28.   DOI: 10.3969/j.issn.1008-0198.2022.05.004 Abstract （156）      PDF（pc） （2746KB）（164）       Knowledge map    Save In this paper, an online voltage stability evaluation method based on particle swarm optimization support vector regression(PSO-SVR) for large power grid is proposed. The traditional voltage stability evaluation method based on deep neural networks(DNN) model is improved to the SVR model optimized by PSO to predict the impedance modulus margin index.This method takes advantage of SVR model′s advantages of strong learning ability and low generalization error rate, and it can also learn the features of samples well in the case of small samples.In order to overcome SVR model is very sensitive to parameter adjustment and function selection.The proposed method uses PSO algorithm to optimize the hyper-parameters of SVR model, which can make the SVR model better learn the nonlinear relationship between power grid operation data and impedance modulus margin value.Finally, the proposed method is validated in IEEE 118 node system, and the accuracy of the proposed method is higher than that of DNN model-based evaluation method. Reference | Related Articles | Metrics

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Analysis of a Grounding Fault Caused by Wiring Error in DC System CHEN Ruizhen, XIE Zhihao, GAO Tipan, WANG Xiao, CHEN Zhilong Hunan Electric Power    2020, 40 (4): 47-50.   DOI: 10.3969/j.issn.1008-0198.2020.04.011 Abstract （154）      PDF（pc） （1915KB）（171）       Knowledge map    Save The DC system of substation provides reliable power for protection device, signal device and automatic safety device. It is an important factor of relay correct operating and its fault may affect the safe operations of the power system. According to a metallic ground fault DC bus negative pole occured during the repair work of a battery, the fault cause are analyzed, and some suggestions are put forward for the completion acceptance and routine test of DC systems. Reference | Related Articles | Metrics

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Hunan Electric Power    2020, 40 (6): 63-.   Abstract （153）            Knowledge map    Save Related Articles | Metrics

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Service Restoration of Distribution Network with DG Based on Dual-population CSO Algorithm LUO Chunhui, QU Gangju, TANG Tao, LIU Junyao, JIANG Jiadong, LUO Weiyuan Hunan Electric Power    2021, 41 (1): 11-17.   DOI: 10.3969/j.issn.1008-0198. 2021. 01. 003 Abstract （150）            Knowledge map    Save To guarantee both the speediness and global optimization of service restoration of distribution network simultaneously, a hierarchical response fault recovery method based on reconfiguration is proposed, and the crisscross optimization ( CSO) algorithm with dual dual-population is applied to seek the reconstruction scheme. Firstly， partial reconstruction using heuristic rules for non-islanding operation is implemented for fast restoration of distribution network connectivity with fewer switching times. Secondly，the optimal solution is searched in the feasible region by CSO algorithm with dual dual-population for global reconstruction while the safety indicators are over-limit, and if the safety indicators are still over-limit, part of non-critical load is shed in the order of the importance index of the load until the disribution network is back to a new safe operation state. Finally, the feasibility and effectiveness of the proposed method are verified by simulation results of improved PG& E distribution system. Related Articles | Metrics

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Review on Joint Emergency Operation of Mobile Energy Storage Networks and Distribution Systems GUAN Zhanglei, ZHAO Tianyang, CAI Zelin Hunan Electric Power    2022, 42 (6): 19-26.   DOI: 10.3969/j.issn.1008-0198.2022.06.004 Abstract （145）      PDF（pc） （11429KB）（57）       Knowledge map    Save The increasing occurrence of extreme weather events (EWEs) are threatening the end energy consumption under high levels of electrification,and it is urgent to increase the resilience of distribution systems. To depict the status quo of joint emergence response capabilities of the mobile energy storage networks (MESNs) and distribution systems, the unconventional emergencies introduced by EWEs are treated as the start point. The prevalent modelling techniques of EWEs and their impacts on coupled electricity and power systems (CEPSs) are summarized. The emergency response capacity of MESNs is concluded from the inventory management and logistics management perspectives considering the varying reachability conditions. Based on the classical resilient management models of distribution systems, the MESNs are incorporated into the resilience enhancement schemes. The benefits allocation among MESNs and distribution systems are overviewed from game theoretical problem formulation and equilibrium computation perspectives. The further research problems on joint emergency management of MESNs and distribution systems are highlighted. Reference | Related Articles | Metrics

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Optimization of Passive Damping Parameters of SWISS Rectifier Based on LCL Filter Genetic Algorithm ZHANG Yang, DENG Jiangwei, CHENG Zhun Hunan Electric Power    2022, 42 (6): 46-53.   DOI: 10.3969/j.issn.1008-0198.2022.06.008 Abstract （143）      PDF（pc） （7534KB）（42）       Knowledge map    Save The improved SWISS rectifier has the advantage of eliminating the commutation dead time without introducing active devices. However, the introduction of LCL filter has the problems of difficult parameter selection and current distortion caused by resonance. In this paper, for improving the SWISS rectifier, the relationship between the network-side current distortion and oscillation problems and the damping coefficient of LCL filter is analyzed, the LCL filter transfer function is constructed, the Bode diagram with different damping is compared, and a genetic algorithm passive damping parameter optimization method with minimized inductance ratio, maximized harmonic attenuation and minimized power loss of the objective function is proposed. The simulation results show that the improved SWISS rectifier front-stage LCL filter network side current harmonic content is significantly lower than the traditional trial-and-error method, the overall dynamic performance of the system is better, moreover, the parameters obtained from the global optimization of genetic algorithm have good convergence,and to some extent, the problem of choosing LCL filter parameters is solved because of the tedious steps. Reference | Related Articles | Metrics

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Comprehensive Evaluation Method of Regulation Performance of Industrial Load Participating in Power Grid Interaction LIU Hanqing, SHEN Yangwu, LIAO Siyang, LEI Xiao, YUE Xuxin, SUN Jieyi, CHEN Yaling, XU Jian Hunan Electric Power    2023, 43 (1): 35-40.   DOI: 10.3969/j.issn.1008-0198.2023.01.006 Abstract （143）      PDF（pc） （4505KB）（160）       Knowledge map    Save In order to evaluate the performance of industrial load participating in power grid regulation, a comprehensive evaluation index system is constructed, which includes three aspects: potential evaluation, economic evaluation and control effect evaluation. The evaluation index calculation method combining subjective and objective is put forward, which can reasonably calculate the index combination weight. The evaluation system is applied to three kinds of typical industrial loads, and the validity of the evaluation index and the proposed analysis method is verified. Reference | Related Articles | Metrics

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BAI Jianfeng, Zhang Xing, Wen Zhihui, Zhao Rui, Gao Feng Hunan Electric Power    2020, 40 (6): 1-.   Abstract （143）            Knowledge map    Save Related Articles | Metrics

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Analysis on Over Tripping Accident of Main Transformer Caused by a Line High Resistance Grounding Fault YIN Chaoyong, XU Hao, XU Liqiang, LI Hui Hunan Electric Power    2020, 40 (4): 51-54.   DOI: 10.3969/j.issn.1008-0198.2020.04.012 Abstract （143）      PDF（pc） （2720KB）（209）       Knowledge map    Save When the high resistance ground fault occurs in the line, the fault characteristics are not obvious. At present, it is difficult for the protection device with single terminal electric quantity to realize the reliable and quick operation of the wholeline, and identify the fault.This paper introduces a single-phase high resistance grounding fault of 110 kV transmission line, analyzes the protection action of relevant lines and main transformer after the fault, points out the fault cause. It draws a conclusion that when the high resistance grounding fault is unstable and stable, protection devices may be refused to move, and its selectivity and sensitivity is difficult to meet the requirements. Reference | Related Articles | Metrics

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Simulation of Unstable High-resistance Ground Fault Based on RTDS Platform XU Hao, YIN Chaoyong, DONG Guoqin, WANG Shannuo, XU Liqiang, OUYANG Fan, ZHU Weijun Hunan Electric Power    2020, 40 (4): 13-18.   DOI: 10.3969/j.issn.1008-0198.2020.04.003 Abstract （142）      PDF（pc） （2681KB）（51）       Knowledge map    Save RTDS is an effective simulation method for mining and processing the hidden criterion of protection device. Based on the case of invisible criterion blocking line protection under unstable high resistance ground fault, this paper analyzes the test requirements, platform, equipment parameters and test items of modeling and simulation of unstable high resistance ground fault based on RTDS, on the basis of accurately grasping the characteristics of the unstable high resistance ground resistance change. The test results show that the proposed simulation model can accurately fit the characteristics of unstable high resistance ground fault. Based on the summary of the test results, this paper further puts forward engineering suggestions for optimizing the operation performance of the protection device. Reference | Related Articles | Metrics

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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 Abstract （142）      PDF（pc） （2403KB）（170）       Knowledge map    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. Reference | Related Articles | Metrics

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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 Abstract （142）      PDF（pc） （3032KB）（226）       Knowledge map    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. Reference | Related Articles | Metrics

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Study on Wind-Proof of Indirect Air Cooling Tower with Vertical Layout CHEN Yun, WANG Limin Hunan Electric Power    2022, 42 (5): 16-21.   DOI: 10.3969/j.issn.1008-0198.2022.05.003 Abstract （142）      PDF（pc） （6457KB）（122）       Knowledge map    Save The air cooling system is greatly affected by the change of external climate. When the wind speed increases or the temperature rises, the heat transfer capacity of the air cooling radiator decreases, thereby leading to the rise of the unit's back pressure. In order to make sure the unit operating safely, some measures should be taken to reduce the influence of high wind speed. In this paper, the flow field distribution and heat dissipation capacity of four models are simulated under high wind speed. According to the analysis and comparison of flow field distribution and heat dissipation capacity data, the heat dissipation capacity of indirect air-cooling tower is as follows: wind-proof wall outside the tower, adjusting shutter, cross wall inside the tower, without any wind-proof measures. Reference | Related Articles | Metrics

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Research Progress and Prospect of UAV Inspection of Substation Equipment LI Huipeng, HUANG Daochun, DENG Yongqing, LI You, ZENG Zhaoqiang, RUAN Jiangjun Hunan Electric Power    2022, 42 (6): 32-39.   DOI: 10.3969/j.issn.1008-0198.2022.06.006 Abstract （141）      PDF（pc） （7644KB）（38）       Knowledge map    Save The use of UAV inspection of substation equipment can achieve multi-angle, refined and high-efficiency inspection of substation equipment. However, UAV inspection of substation equipment is still at the period of research and pilot application. Research perspectives are presented based on a review of the current state of relevant research. Before large-scale promotion, it is recommended to develop technical specifications and standards for UAV inspection of substation equipment and combineing the advantages of different trajectory planning algorithms to realize the intelligent planning of global static trajectory and local dynamic trajectory. In addition, a sample library of substation equipment defects is build and algorithms such as artificial neural networks is used to promote intelligent diagnosis of hidden defects. In view of the deficiencies in the existing safety distance study, it is recommended to fully consider the special characteristics of the substation environment, and propose a safety distance determination method for UAV operations in substations. The safety distance tests of UAV measurement and control performance under electric field and magnetic field environment are carried out and the safety distance criterion is proposed. In addition, the fast analysis method of safety distance of UAV near heterogeneous electrode/conductor is established by using machine learning and data fitting. Reference | Related Articles | Metrics

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Insulator Pollution Monitoring Based on Acoustic Signal and One-Dimensional Convolutional Neural Network LI Zhenhua, LI Hao, HUANG Jingguang, ZHANG Lei, WU Lin Hunan Electric Power    2022, 42 (4): 18-22.   DOI: 10.3969/j.issn.1008-0198.2022.04.004 Abstract （140）      PDF（pc） （2465KB）（190）       Knowledge map    Save Aiming at the problem of discharge mode monitoring of polluted insulators in high voltage transmission lines,a new one-dimensional convolutional neural network structure (1D-CNN) is designed for monitoring the discharge patterns of fouled insulators in high-voltage lines, and a fouled insulator discharge pattern monitoring method based on acoustic emission signals and 1D-CNN is proposed. After preprocessing the acoustic emission signals collected in the laboratory under different discharge states, the convolutional neural network is used to perform adaptive feature extraction and feature dimensionality reduction on the discharge signal samples to reduce the training model parameters and computation, and finally the Softmax function is used to classify the prediction results. The recognition results show that the model can achieve a recognition rate of more than 99.84%, which effectively solves the process of manual preprocessing of data in the traditional insulator fouling degree monitoring method and can be effectively applied to the task of fouling insulator discharge pattern monitoring. Reference | Related Articles | Metrics

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Study on Voltage Sag Flexible Management Strategy with Energy Storage Device ZENG Jinhui, HUANG Xi, WANG Can, LAN Zheng, LIANG Bowen Hunan Electric Power    2022, 42 (4): 33-39.   DOI: 10.3969/j.issn.1008-0198.2022.04.007 Abstract （138）      PDF（pc） （3665KB）（101）       Knowledge map    Save In order to reduce the influence of power grid voltage sag on the safe operation of sensitive loads, this paper proposes a flexible voltage sag management strategy with energy storage device, which can take into account voltage sag management while peak clipping and valley filling. Firstly, the DC component of power grid voltage is extracted by differentiating the dq component of power grid voltage to realize the accurate detection of power grid voltage sag amplitude and phase, and achieve the effect of improving the dynamic response speed of the system. Secondly, in the power grid voltage sag and recovery stage, the flexible switching strategy is used to realize the flexible compensation of sag voltage, so as to reduce the current impact of sensitive loads before and after voltage sag and ensure the steady-state accuracy of output voltage. Finally, a simulation model is built on MATLAB/Simulink platform to verify the correctness and effectiveness of the proposed flexible governance control strategy. Reference | Related Articles | Metrics

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Hunan Electric Power    2020, 40 (6): 5-.   Abstract （136）            Knowledge map    Save Related Articles | Metrics

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Research on Lithium Battery Parallel System and Level Difference Coordination in Substation ZHAO Wenqin, XIAO Hui, ZHANG Maolin, LI Yihang, LONG Feiyu, WEN Zhang Hunan Electric Power    2022, 42 (4): 23-27.   DOI: 10.3969/j.issn.1008-0198.2022.04.005 Abstract （135）      PDF（pc） （2129KB）（208）       Knowledge map    Save The DC system is the last barrier of the substation power supply system, and its power supply reliability directly affects the operation of the entire substation. Based on a 220 kV substation, using lithium iron phosphate batteries to replace the original lead-acid batteries, this article analyzes the characteristics and applications of lithium iron phosphate batteries advantages and feasibility, studies the topological structure of the DC system, and calculates the short-circuit current of the upgraded DC system. According to the calculation results, and referring to the circuit breaker tripping curve, the paper analyzes the rationality of its level difference coordination, and points out the defects of the converter and the fuse. It provides a basis for the further upgrade and transformation of the DC system. 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 （135）      PDF（pc） （1504KB）（109）       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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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 Abstract （135）      PDF（pc） （3081KB）（209）       Knowledge map    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. Reference | Related Articles | Metrics

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Model Predictive Control Based on Quasi-Z Source Modular Multilevel Converter ZHANG Yang, LUO Chaokui, YI Wenjing, CHENG Zhun Hunan Electric Power    2023, 43 (1): 8-16.   DOI: 10.3969/j.issn.1008-0198.2023.01.002 Abstract （134）      PDF（pc） （10901KB）（46）       Knowledge map    Save In order to solve the problems of complex control structure, large fluctuation of DC-link voltage, poor AC output power quality and slow dynamic response when traditional carrier stack phase-disposition pulse width modulation (PD-PWM) is used in quasi-Z source modular multilevel converter (qZ-MMC), a model predictive control (MPC) for qZ-MMC is proposed in this paper. The control set of output voltage level is constructed according to the DC-link voltage, so as to predict the output current, without setting a PWM generator for each sub-module. At the same time, the mathematical model of inductor current and capacitor voltage of quasi-Z source network is analyzed, and the cost function of inductor current, capacitor voltage and AC output current is designed, so as to suppress the fluctuation of DC-link voltage and improve the power quality of output voltage. The effectiveness and feasibility of the proposed control method are verified on MATLAB/SIMULINK simulation platform. Reference | Related Articles | Metrics