考虑链路延时的MMC高频稳定性分析与振荡抑制策略  

High frequency stability analysis and oscillation suppression strategy for an MMC considering link delays

作　　者：徐韬 束洪春[1] 冯海洋 孙士云[1] 陈有为 张丕豪 XU Tao;SHU Hongchun;FENG Haiyang;SUN Shiyun;CHEN Youwei;ZHANG Pihao(Kunming University of Science and Technology,Kunming 650500,China;Kunming Power Supply Bureau,Yunnan Power Grid Co.,Ltd.,Kunming 650011,China)

机构地区：[1]昆明理工大学,云南昆明650500 [2]云南电网有限责任公司昆明供电局,云南昆明650011

出　　处：《电力系统保护与控制》2025年第8期58-70,共13页Power System Protection and Control

基　　金：国家自然科学基金项目资助(52037003);云南省重大专项资助(202002AF080001)。

摘　　要：基于模块化多电平换流器(modular multilevel converter,MMC)的高压直流输电(high voltage direct current,HVDC)系统因其固有的链路延时特点,可能导致系统出现高频振荡现象。针对此问题,建立了含链路延时的MMC小信号模型,利用特征值分析法对高频振荡模式进行分析,揭示了高频振荡的发生机理。进而提出了一种基于二阶带阻滤波器的高频振荡抑制策略,以确保高频段有足够的正阻尼。并与采用低通滤波器和非线性滤波器的抑制策略进行对比,探讨了不同策略的抑制效果以及对MMC动态性能和故障穿越能力的影响。最后,根据PSCAD/EMTDC电磁暂态仿真模型验证了理论分析的正确性以及抑制措施的有效性。Because of the inherent link delay characteristics of a modular multilevel converter(MMC)based high voltage direct current(HVDC)transmission systems,high frequency oscillations may occur.Thus a small signal MMC model incorporating link delays is established.The eigenvalue analysis method is used to analyze the high frequency oscillation modes,and the underlying mechanism of high frequency oscillations is revealed.Also,a high-frequency oscillation suppression strategy based on a second-order notch filter is proposed to ensure sufficient positive damping in the high frequency band.A comparative analysis is conducted between this strategy and suppression methods using low-pass and nonlinear filters,evaluating their effectiveness in mitigating oscillations and their impact on MMC dynamic performance and fault ride-through capability.Finally,the correctness of the theoretical analysis and the effectiveness of the suppression measures are verified by electromagnetic transient simulations using the PSCAD/EMTDC platform.

关 键 词：小干扰稳定性 状态空间模型 高频振荡 附加阻尼控制 高压直流输电 

分 类 号：TM721[电气工程—电力系统及自动化]