应用于LCC-HVDC弱受端的链式STATCOM改进控制策略研究  

Research on Improved Control Strategies of STATCOM for LCC-HVDC Weak Receiving Station

作　　者：姚为正[1] 刘刚[1] 胡四全[1] 孙健[1] 左广杰[1] 许恩泽[1] 高志军[1] YAO Weizheng;LIU Gang;HU Siquan;SUN Jian;ZUO Guangjie;XU Enze;GAO Zhijun(Xuji Group Corporation, Xuchang 461000, Henan Province, China)

机构地区：[1]许继集团有限公司

出　　处：《中国电机工程学报》2018年第12期3662-3670,共9页Proceedings of the CSEE

摘　　要：研究应用于电网换相高压直流输电系统（line commutate converter based high voltage direct current,LCCHVDC）弱受端的链式静止同步补偿器（static synchronous compensator,STATCOM）控制策略,提高其暂态控制性能。首先,对基于比例谐振控制器的分相瞬时电流控制策略进行了论述;其次,将专用降压变的短路阻抗等效至STATCOM主回路,则STATCOM等效直挂在虚拟35kV交流系统,提出虚拟35kV电压瞬时值前馈及其与幅值前馈的在线切换方法、以虚拟35kV电压为控制目标的暂态分相控制策略;最后,将所提出的控制策略运用在国内首套应用于LCCHVDC弱受端换流站的STATCOM中,仿真结果、RTDS试验和工程现场试验验证了其合理性与有效性。This paper studied the control strategies of static synchronous compensator（STATCOM） for the weak receiving station of line commutate converter based high voltage direct current（LCC-HVDC） transmission system, to improve its transient control characteristics. First, the individual phase instantaneous current control strategy based on proportional resonance controller was discussed. Second, the short-circuit impedance of the dedicated transformer was equivalent to the main circuit of STATCOM, then STATCOM was equivalent to hanging directly in the virtual 35 kV AC system. The instantaneous value feedforward of virtual 35 kV voltage and its on-line switching method with 35 kV voltage amplitude feedforward were proposed and a transient individual phase control strategy with virtual 35 kV voltage as the control target was proposed. Finally, the simulation results, RTDS test and engineering field test verify the rationality and validity of the proposed control strategies in the first set of STATCOM applied to LCC-HVDC weak receiving station in China.

关 键 词：电网换相高压直流输电 链式静止同步补偿器 分相瞬时电流控制 电压前馈 暂态分相控制 

分 类 号：TM76[电气工程—电力系统及自动化]