电力系统保护与控制2024，Vol.52Issue(9)：46-58,13.DOI:10.19783/j.cnki.pspc.230994
考虑频率耦合的MMC序阻抗建模及附加陷波器阻抗重塑方法
Modeling of MMC sequence impedance considering frequency coupling and impedance reshaping with additional notch filter
摘要
Abstract
The frequency coupling between a modular multilevel converter(MMC)and the power grid will affect the impedance characteristics of the converter.Conventional research does not consider the frequency coupling,causing that the impedance model is inaccurate.This is a problem for the analysis of the impedance characteristics of the system.In this paper,a full-order impedance model of MMC considering frequency coupling is established,and then the stability of the system is analyzed.An optimization scheme of MMC impedance based on a notch filter is proposed to solve the stability problem of a weak grid interconnection system.Analysis is made on the reason that the traditional impedance modeling of MMC cannot find the actual low-frequency oscillation effectively,and the generation mechanism and influence degree of frequency coupling in MMC modeling are studied.From the generation mechanism,the small signal model and variable relationship are established,and the full-order impedance model of MMC with frequency coupling is derived.Based on the full-order model,a system impedance optimization scheme based on notch is proposed.This effectively solves the problem of low frequency oscillation and stability analysis of an MMC weak network interconnection system.The simulation results verify the accuracy of the full-order impedance model of the MMC under coupling and the feasibility of the low frequency oscillation impedance optimization.关键词
MMC/频率耦合/弱电网/序阻抗/陷波器Key words
MMC/frequency coupling/weak current network/sequence impedance/notch filter引用本文复制引用
张宇华,周璟,王育飞,薛花,郜登科,李鸿彪..考虑频率耦合的MMC序阻抗建模及附加陷波器阻抗重塑方法[J].电力系统保护与控制,2024,52(9):46-58,13.基金项目
This work is supported by the Shanghai Science and Technology Innovation Action Plan(No.19DZ2204700). 上海市科技创新行动计划项目资助(19DZ2204700) （No.19DZ2204700）
上海市科委地方院校能力建设计划项目资助(22010501400) （22010501400）
上海市科技重大专项资助(2018SHZDZX01) （2018SHZDZX01）
