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      1. Suzhou Electric Appliance Research Institute
        期刊号: CN32-1800/TM| ISSN1007-3175

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        柔性多端高压直流输电系统双环附加频率控制研究

        来源:电工电气发布时间:2021-06-28 10:28 浏览次数:67
        柔性多端高压直流输电系统双环附加频率控制研究
         
        马岩1 ,潘欢1,2,纳春宁1,2
        (1 宁夏大学 物理与电子电气工程学院,宁夏 银川 750021;
        2 宁夏电力能源安全重点实验室,宁夏 银川 750004) 
         
         
            摘 要 :传统 PI 双环解耦电流控制的电压源型转换器难以为孤立交流区域提供频率支持,因此需要增加频率控制环节。通过在 VSC 控制器的有功控制环中增加有功 - 频率下垂控制,在无功环中增加无功频率微分控制,设计一种基于本地信号、无需远程通信的双环附加频率控制策略。该控制策略主要通过共享风电场功率裕度实现对 AC 区域的频率支持,同时通过无功环附加频率控制改善交流区域频率响应暂态性能。在 MATLAB/Simulink 仿真平台搭建 4 端柔性高压直流输电系统,验证了双环附加频率控制策略的有效性。
            关键词 :柔性多端高压直流输电 ;下垂控制 ;双环附加控制 ;功率裕度 ;频率支持
            中图分类号 :TM712 ;TM721.1     文献标识码 :A     文章编号 :1007-3175(2021)06-0001-07
         
        Research on Double Loop Additional Frequency Control of
        VSC-MTDC System
         
        MA Yan1 , PAN Huan1,2, NA Chun-ning1,2
        (1 School of Physics and Electronic-Electrical Engineering, Ningxia University, Yinchuan 750021, China;
        2 Ningxia Key Laboratory of Electrical Energy Security, Yinchuan 750004, China)
         
            Abstract: The voltage source converter which based on traditional PI double loop decoupling current control is difficult to provide frequency support for isolated AC region, so it needs to add frequency control link. By adding active-frequency droop control in active control loop of VSC controller in AC area side and reactive-frequency differential control in reactive loop, a dual loop additional frequency control based on local signal and without remote communication is designed. The control strategy can support the frequency of AC area by sharing the power margin of WPP, at the same time, the additional frequency control of reactive power loop is used to improve the transient performance of AC frequency response. A four-terminal VSC-MTDC system is built on MATLAB/Simulink simulation platform to verify the effectiveness of the dual loop additional frequency control strategy.
            Key words: VSC-MTDC; droop control; double loop additional control; power margin; frequency support
         
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