我国经济的迅速发展带动了电力事业的进步。为了更好地满足社会生产和人们的日常生活对电能的需求,电力企业不断扩大电力系统的建设规模。充分保证系统运行的稳定性,加强对高压输电线路的检修不仅是系统保持良好运行的基础,还能够减少...我国经济的迅速发展带动了电力事业的进步。为了更好地满足社会生产和人们的日常生活对电能的需求,电力企业不断扩大电力系统的建设规模。充分保证系统运行的稳定性,加强对高压输电线路的检修不仅是系统保持良好运行的基础,还能够减少因线路检修造成的区域停电等对居民生产和生活的影响。通过对220 k V高压输电线路带电检修方式进行分析,探究了带电检修技术的应用,以期为提高电力系统的检修效率提供帮助。展开更多
Based on a±10 kV three-terminal MMC-MVDC(medium voltage DC distribution system based on modular multilevel converter)system,in this study,the authors mainly study on the influencing factors and protection schemes...Based on a±10 kV three-terminal MMC-MVDC(medium voltage DC distribution system based on modular multilevel converter)system,in this study,the authors mainly study on the influencing factors and protection schemes of the lightning intruding overvoltage(including direct lightning and back-flashover lightning).Firstly,a lightning intruding overvoltage simulation model of the MMC-MVDC distribution system using overhead lines is established based on the PSCAD/EMTDC program.The influence of steady-state operating voltage and the number of converter stations on the simulation results are simulated and analysed.Meanwhile,the proper simulation modelling method of the lightning intruding overvoltage for multi-terminal MMC-MVDC system is proposed.Secondly,the lightning intruding overvoltage is simulated when the line is struck by the lightning stroke current that occurs once in 20 years and the different lightning protection schemes are proposed.Finally,based on the lightning impulse withstand voltage,lightning trip-out rate and the cost of the protection schemes,the lightning protection schemes in different scenarios are proposed.The simulation results show that if the cost of the system is prioritised,the protection scheme of increasing the number of parallel stacks of the DL arresters can be selected,and if the power supply reliability of the system is prioritised,the protection scheme of installing the overhead ground wire as well as reducing grounding resistance can be selected.展开更多
文摘我国经济的迅速发展带动了电力事业的进步。为了更好地满足社会生产和人们的日常生活对电能的需求,电力企业不断扩大电力系统的建设规模。充分保证系统运行的稳定性,加强对高压输电线路的检修不仅是系统保持良好运行的基础,还能够减少因线路检修造成的区域停电等对居民生产和生活的影响。通过对220 k V高压输电线路带电检修方式进行分析,探究了带电检修技术的应用,以期为提高电力系统的检修效率提供帮助。
基金supported by the National Natural Science Foundation of China(51807068)Open Foundation of‘State Key Laboratory of HVDC,Electric Power Research Institute,China Southern Power Grid’(SKLHVDC-2019-KF-04).
文摘Based on a±10 kV three-terminal MMC-MVDC(medium voltage DC distribution system based on modular multilevel converter)system,in this study,the authors mainly study on the influencing factors and protection schemes of the lightning intruding overvoltage(including direct lightning and back-flashover lightning).Firstly,a lightning intruding overvoltage simulation model of the MMC-MVDC distribution system using overhead lines is established based on the PSCAD/EMTDC program.The influence of steady-state operating voltage and the number of converter stations on the simulation results are simulated and analysed.Meanwhile,the proper simulation modelling method of the lightning intruding overvoltage for multi-terminal MMC-MVDC system is proposed.Secondly,the lightning intruding overvoltage is simulated when the line is struck by the lightning stroke current that occurs once in 20 years and the different lightning protection schemes are proposed.Finally,based on the lightning impulse withstand voltage,lightning trip-out rate and the cost of the protection schemes,the lightning protection schemes in different scenarios are proposed.The simulation results show that if the cost of the system is prioritised,the protection scheme of increasing the number of parallel stacks of the DL arresters can be selected,and if the power supply reliability of the system is prioritised,the protection scheme of installing the overhead ground wire as well as reducing grounding resistance can be selected.
