摘要
为分析连接弱交流电网的柔性直流输电(VSC-HVDC)系统矢量控制环节与弱交流电网交互作用对系统稳定性的影响,分别建立了电压源换流器(VSC)不同运行方式下连接弱交流电网的VSC-HVDC系统线性化传递函数模型。通过研究线性化传递函数模型开/闭环传递函数的零极点分布,提出了系统失稳的解析判据。同时研究了VSC输出有功功率、无功功率和端电压幅值与注入电网的dq轴电流间的关系,揭示了连接弱交流电网的VSC-HVDC系统失稳机理,得出了失稳判据的物理意义。最后,在PSCAD/EMTDC中搭建了连接弱交流电网的VSC-HVDC系统仿真模型,对理论研究进行了仿真验证。
To analyze the influence of the interaction between vector control loop and the weak AC grid on system stability, the linearized transfer function models under different operating modes of VSC were built. By analyzing the distributions of zeros and poles in open-loop transfer function and closed loop transfer function, the instability analytical criterion was proposed. Meanwhile, the relationship of the power and current in the simplified system of VSC was studied, which revealed the instability mechanism of VSC-HVDC connected to the weak AC system and obtained the physical meaning of the instability criterion. Finally, VSC-HVDC connected to the weak AC system model was built in PSCAD/EMTDC and the theoretical research was verified by simulation.
作者
邵冰冰
赵书强
高本锋
宋斯珩
李忍
Shao Bingbing;Zhao Shuqiang;Gao Benfeng;Song Siheng;Li Ren(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Souces North China Electric Power University,Baoding 071003 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2019年第18期3884-3888,3889-3896,共13页
Transactions of China Electrotechnical Society
基金
河北省自然科学基金(E2017502075)
国家自然科学基金(51507064)
中央高校基本科研业务费专项资金(2018QN079、2018MS087)资助项目
关键词
柔性直流输电
矢量控制
弱交流电网
线性化传递函数模型
失稳
VSC-HVDC
vector control loop
weak AC power grid
linearized transfer function models
instability
