华文,林进钿,裘鹏,陆翌,潘武略,张静,林艺哲
HUA Wen,LIN Jintian,QIU Peng,LU Yi,PAN Wulue,ZHANG Jing,LIN Yizhe

• 1:国网浙江省电力有限公司电力科学研究院
• 2:国网浙江省电力有限公司
• 3:南京南瑞继保工程技术有限公司

摘要(Abstract)：

电压源型换流器在控制链路延时较长的情况下会在高频段呈现出负阻尼效应，并可能与交流系统发生高频谐振。柔性低频交流输电系统采用M3C（模块化多电平矩阵变换器）作为核心设备，其高频谐振风险有待评估。以实际工程为例，建立了M3C的高频阻抗模型，通过阻抗分析法评估了柔性低频交流输电系统在多种运行方式下的高频谐振风险，得到了谐振风险较大的运行工况，并分析了高频谐振产生机理。在此基础上，针对实际工程提出了在M3C电压前馈环节中附加低通滤波器的高频谐振抑制策略。电磁暂态仿真验证了分析结果的准确性以及所提高频谐振抑制策略的有效性。
Due to the long delay of their control chains,voltage source converters(VSCs)in the high frequency band tend to show negative damping,which may give rise to high-frequency resonance when VSCs are connected to power systems. Flexible low-frequency alternating current transmission(LFAC)system adopts the modular multilevel matrix converter(M3C)as the core equipment and its high-frequency resonance risk needs to be evaluated.Based on practical engineering,this paper establishes the high-frequency impedance model of M3C. It evaluates the high-frequency resonance risk of the LFAC system under multiple operating modes through impedance analysis method. The operating conditions with high resonance risk are obtained,and the generation mechanism of the resonance is analyzed. Furthermore,a high-frequency resonance suppression strategy of installing an extra low-pass filter in the voltage feedforward control of M3C is proposed for practical engineering. Finally,the accuracy of the analysis results and the effectiveness of the proposed high-frequency resonance suppression strategy are verified by electromagnetic transient simulation.

关键词(KeyWords)： 模块化多电平矩阵变换器;柔性低频交流输电;高频谐振;控制延时;谐振抑制
modular multilevel matrix converter(M3C);flexible low-frequency alternating current transmission(LFAC);high-frequency resonance;control delay;resonance suppression

Abstract:

Keywords:

基金项目(Foundation): 国网浙江省电力有限公司科技项目（2021ZK06）

作者(Author): 华文,林进钿,裘鹏,陆翌,潘武略,张静,林艺哲
HUA Wen,LIN Jintian,QIU Peng,LU Yi,PAN Wulue,ZHANG Jing,LIN Yizhe

DOI: 10.19585/j.zjdl.202210012

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