摘要
基于模块化多电平换流器的高压直流输电(MMC-HVDC)的长链路延时引发的高频振荡严重威胁了电力系统的安全稳定运行。采用时滞稳定裕度衡量MMC-HVDC系统的高频稳定性,建立了MMC-HVDC时滞系统的高阶状态空间模型,应用基于广义特征根的时滞系统稳定性分析方法直接求解MMC-HVDC系统的时滞稳定裕度,并分析了控制器参数对系统高频稳定性的影响。将MMC-HVDC系统链路延时对系统高频稳定性的影响等效为外部干扰,通过混合灵敏度优化设计了基于H_(∞)鲁棒控制的MMC-HVDC系统高频振荡抑制策略。通过MMC-HVDC电磁暂态仿真,验证了基于广义特征根的时滞系统稳定性分析方法求解系统时滞稳定裕度的有效性以及基于H_(∞)鲁棒控制的高频振荡抑制策略的优越性,为研究MMC-HVDC系统的高频振荡及抑制策略提供了一种新思路。
High-frequency oscillation caused by long link delay of MMC-HVDC(Modular Multilevel Converter based High Voltage Direct Current)seriously threatens the safety and stability of power system.The timedelay stability margin is adopted to measure the high-frequency stability of MMC-HVDC system and the high-order state space model of the MMC-HVDC time-delay system is established.The time-delay stability margin of MMC-HVDC system is directly solved by the stability analysis method of time-delay system based on generalized eigenvalue,and the influence of controller parameters on the high-frequency stability of system is analyzed.The influence of link delay of MMC-HVDC system on high-frequency stability of system is equivalent to external interference.The high-frequency oscillation suppression strategy of MMC-HVDC system based on H_(∞) robust control is designed through hybrid sensitivity optimization.The effectiveness of the stability analysis method of time-delay system based on generalized eigenvalue for solving the timedelay stability margin of system and the superiority of the high-frequency oscillation suppression strategy based on H_(∞) robust control are verified by MMC-HVDC electromagnetic transient simulation.The research provides a new idea for the study of high-frequency oscillation and suppression strategy of MMC-HVDC system.
作者
张芳
姚文鹏
张紫菁
ZHANG Fang;YAO Wenpeng;ZHANG Zijing(Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin 300072,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2022年第8期174-183,共10页
Electric Power Automation Equipment
关键词
MMC-HVDC
高频振荡
广义特征根
H∞鲁棒控制
振荡抑制
MMC-HVDC
high-frequency oscillation
generalized eigenvalue
H∞robust control
oscillation suppression
