模块化多电平柔性直流换流器高频振荡抑制策略与参数优化设计  

Strategy Design and Parameter Optimization of High-Frequency Resonance Suppression for Modular Multilevel Converter

作　　者：周啸 阳岳希 寇龙泽 李云丰 钱学威 郝捷 景卫哲 ZHOU Xiao;YANG Yuexi;KOU Longze;LI Yunfeng;QIAN Xuewei;HAO Jie;JING Weizhe(National Key Laboratory of Advanced Power Transmission Technology(China Electric Power Research Institute Co.,Ltd.),Beijing 102209,China;National Key Laboratory of Disaster Prevention and Reduction for Power Grid(Changsha University of Science and Technology),Changsha 410114,China;State Grid Shanxi Electric Power Company Electric Power Research Institute,Taiyuan 030001,China)

机构地区：[1]先进输电技术全国重点实验室(中国电力科学研究院有限公司),北京102209 [2]电网防灾减灾全国重点实验室(长沙理工大学),湖南长沙410114 [3]国网山西省电力公司电力科学研究院,山西太原030001

出　　处：《中国电力》2025年第1期50-60,共11页Electric Power

基　　金：国家电网有限公司科技项目(5100-202258310A-2-0-QZ)。

摘　　要：针对柔性直流输电系统送出时换流站高频振荡问题,提出了一种有源阻尼与无源阻尼抑制方案及其参数优化设计方法,旨在从换流站角度无源化阻抗特性,实现高频振荡可靠抑制。首先,通过分析换流站高频简化阻抗模型中的负阻尼特性,揭示了抑制方案中有源阻尼应实现换流站负阻尼转移到更高频率的原则。其次,基于阻抗模型求得虚拟串联阻抗有源阻尼控制器参数的选取原则,采用系数拟合法求取合适参数。然后,以降低投入成本为目标、完全消除高频负阻尼为约束,运用优化算法确定无源滤波器参数,通过对比虚拟串联阻抗加入后无源滤波器的参数变化,突出协调抑制方案的经济性。最后,通过电磁暂态仿真,验证了参数优化设计方法下抑制方案的正确性和有效性。Addressing the issue of high-frequency oscillations in converter stations during flexible DC grid integration and transmission,a suppression scheme combining active and passive damping,along with a method for optimizing the design of its parameters,is proposed.This scheme aims to alter the impedance characteristics of the converter station from a passive perspective,thereby achieving reliable suppression of high-frequency oscillations.Firstly,by analyzing the negative damping characteristics within the simplified high-frequency impedance model of the converter station,the principle is revealed that the active damping in the suppression scheme should shift the negative damping of the converter station to higher frequencies.Secondly,based on the impedance model,the principle for selecting the parameters of the active damping controller for virtual series impedance is derived,and appropriate parameters are obtained using a coefficient fitting method.Subsequently,with the goal of reducing investment costs and the constraint of completely eliminating high-frequency negative damping,an optimization algorithm is employed to determine the parameters of the passive filter.By comparing the parameter changes of the passive filter before and after the addition of virtual series impedance,the economic benefits of the coordinated suppression scheme are highlighted.Finally,electromagnetic transient simulations verify the correctness and effectiveness of the suppression scheme under the optimized parameter design method.

关 键 词：柔性直流输电 换流站 高频振荡 无源滤波器 系数拟合 优化算法 

分 类 号：TM721.1[电气工程—电力系统及自动化]