摘要
模块化多电平换流器型高压直流(MMC-HVDC)输电系统接入电网后将对交流系统短路电流产生影响,但目前交流保护整定计算通常忽略MMC-HVDC接入母线故障时模块化多电平换流器对短路电流的贡献。文中以交流保护整定计算为出发点,提出了MMC-HVDC系统简化分析原则。在分析MMC-HVDC系统控制特性的基础上,建立了适用于交流保护整定计算的MMC-HVDC等效模型,提出MMC-HVDC接入母线故障时可以将直流侧等效为一个正序电流源。研究了MMC-HVDC接入母线故障时不同故障点残压下MMC-HVDC直流侧响应特性,确定了等效电流源的幅值和相位,并进行了仿真验证。最后,提出了MMC-HVDC对交流保护整定计算影响的定量评估指标及其计算方法。
Short-circuit current of AC system can be affected by modular multilevel converter based high-voltage direct current(MMC-HVDC)transmission systems integrated into power grid.However,the short-circuit current contributed by the MMC has not been taken into consideration for AC protection setting calculations.From the standpoint of AC protection setting calculation,the principles of simplified analysis of MMC-HVDC are proposed.Based on the analysis of the control characteristics of MMC-HVDC system,an equivalent model of MMC-HVDC for AC protection setting calculation is established.A positive sequence current source is proposed for representing the MMC with access bus faults.Response characteristics of MMC-HVDC on the DC side with different residual voltages of fault points are studied under access bus faults for MMC-HVDC.The magnitude and phase of equivalent current source are determined and verified by simulation.Finally,a quantitative index for evaluating the influence of MMC-HVDC on AC protection setting calculation is proposed.
作者
刘若平
屠卿瑞
李银红
罗强
雷淇
LIU Ruoping;TU Qingrui;LI Yinhong;LUO Qiang;LEI Qi(School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology),Wuhan 430074,China;Key Laboratory of Electric Power Security and High Efficiency of Hubei Province(Huazhong University of Science and Technology),Guangzhou 430074,China;Power System Planning Research Center of Guangdong Power Grid Co.,Ltd.,Wuhan 510062,China;Electric Power Dispatching and Control Center of Guangdong Power Grid Co.,Ltd.,Guangzhou)
出处
《电力系统自动化》
EI
CSCD
北大核心
2019年第18期145-155,共11页
Automation of Electric Power Systems
基金
国家重点研发计划资助项目(2016YFB0900101)~~
关键词
模块化多电平换流器
高压直流输电
接入母线故障
等效模型
响应特性
modular multilevel converter(MMC)
high-voltage direct current(HVDC)transmission
access bus fault
equivalent model
response characteristics
