双端VSC-HVDC系统建模及控制方法研究  

Study of double-pointed VSC-HVDC system modeling and control strategies

作　　者：梁律[1,2] 罗隆福[1] 黄肇[1] 陈尚敏[1,3] 林艺熙 

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082 [2]中国南方电网超高压输电公司广州局,广东广州510405 [3]湖南省电力公司检修公司,湖南长沙410004

出　　处：《电源技术》2016年第3期675-679,共5页Chinese Journal of Power Sources

基　　金：国家自然科学基金资助项目(50907018);湖南省研究生科研创新项目(CX2012B127)

摘　　要：在dq0坐标系下建立了双端VSC-HVDC系统的数学模型,并基于该坐标系制定了相应的控制策略。所采用的控制器由外环控制器和内环控制器构成,外环控制器由基于常规PI调节器的定功率控制器/定电压控制器构成,输出为内环控制器的参考值;内环电流控制器采用电流反馈和电压前馈的解耦控制策略,实现电流的快速跟踪控制。此外,针对VSC-HVDC启动时需要限流和限压的要求,在启动前投入限流电阻,确保系统能够平稳快速的响应,系统达到稳态后切除限流电阻。最后,在PSCAD/EMTDC的仿真结果表明,所设计的控制器具有很好的调节性能。A mathematical model of double-pointed VSC-HVDC system was established and its control strategy was draw up in dq0 coordinate system. The controller consisted of outer loop and inner loop. The outer loop, which combined power/voltage controller based on conventional PI regulator, its output was reference of inner controller.The inner current loop, which adopted current feed-back and voltage feed-forward, realizing the current＇s fast tracking. In consideration of the requirement of current and voltage＇s limitation in the process of start-up, resistors were inserted and made the system＇s response smooth and fast. They were cut off after the system＇s going to steady. Last, simulation tests realized by PSCAD/EMTDC were performed to verify the designed controllers have good response speed and recovery ability after fault.

关 键 词：VSC-HVDC 电流反馈 电压前馈 解耦控制 PSCAD/EMTDC 

分 类 号：TM721[电气工程—电力系统及自动化]