摘要
提出一种高压直流输电系统在不对称故障下直流侧注入交流侧的短路电流计算方法。该方法通过分析直流系统在故障下的控制特性,得出直流电流和直流电压的关系;分析在交流系统不对称情况下换流器的动态特性,引进开关函数建立高压直流输电系统的开关函数模型,运用该模型得出直流侧电流与交流侧电流的等值关系。通过PSCAD软件对开关函数模型和国际大电网会议直流输电标准测试系统进行仿真计算和比较,两者所得结果在故障期间能较好地吻合,证明该模型是精确和有效的。
The paper proposes a calculation method for short-circuit current injected to AC side from HVDC system under asymmetric fault.By control characteristic analysis of DC system under fault,the relationship between direct current and di-rect current voltage is concluded;dynamic characteristics of converter is analyzed in case of asymmetric AC system;switch function model for HVDC system is established through introduction of switch function to conclude equivalent relation be-tween current at DC side and AC side.By simulation calculation and comparison of switch function model though PSCAD and DC transmission standard test system of international conference on large high voltage electric system,the results from the two can tally with each other,which means the model is accurate and effective.
出处
《广东电力》
2015年第11期58-61,共4页
Guangdong Electric Power
基金
广东电网有限责任公司科技项目(K-GD2014-099)
国家自然科学基金资助项目(61233008)
关键词
高压直流系统
换流器
动态特性
开关函数
HVDC system
converter
dynamic characteristic
switch function
