柔性直流输电系统多端异构通用化阻抗建模与分析  

Multi-terminal Heterogeneous Generalized Impedance Modeling and Analysis of MMC-MTDC Transmission Systems

作　　者：周国梁 高丽萍 梁言桥 李文津 王鑫 ZHOU Guoliang;GAO Liping;LIANG Yanqiao;LI Wenjin;WANG Xin(China Power Engineering Consultant Group Zhongnan Electric Power Design Institute Co.,Ltd.,Wuhan 430061,China;National Key Laboratory of Renewable Energy Grid-Integration(China Electric Power Research Institute),Beijing 100192,China)

机构地区：[1]中国电力工程顾问集团中南电力设计院有限公司,湖北武汉430061 [2]可再生能源并网全国重点实验室(中国电力科学研究院有限公司),北京100192

出　　处：《中国电力》2025年第3期73-85,共13页Electric Power

基　　金：中国电力工程顾问集团科技项目(海上风电场柔性直流送出系统宽频谐振机理与抑制方案研究,DG2-D03-2022);国家电网有限公司科技项目(100%新能源发电基地经二极管整流送出组网拓扑与运行控制技术研究,5108-202218280A-2-307-XG)。

摘　　要：新能源、基于模块化多电平换流器的多端柔性直流(modular multilevel converter-based multi-terminal high voltage direct current,MMC-MTDC)以及交流电网之间宽频振荡风险凸出,严重制约MMC-MTDC安全稳定运行和新能源高效消纳。MMC-MTDC各换流站呈现定交流电压、定直流电压、定功率等异构化控制方式,多端换流站之间又存在强非线性耦合,给系统振荡建模与分析带来挑战。为此,首先提出计及正负序控制的MMC-MTDC控制系统模块化建模方法。然后,针对复杂交直流网架结构,建立计及多端非线性耦合的MMC-MTDC不同断面通用化阻抗模型。最后,以三端MMC-MTDC环网为例,仿真验证通用化阻抗建模的准确性和有效性,并分析多端互联系统及正负序控制对阻抗特性的耦合影响,为新能源基地经MMC-MTDC互联系统振荡分析提供基础。The prominent risks of broadband oscillation among renewable energy,modular multilevel converter-based multi-terminal high voltage direct current(MMC-MTDC)and AC grid severely constrain the safe and stable operation and efficient accommodation of renewable energy.The control strategies of different converter stations of MMC-MTDC are various such as constant AC voltage,constant DC voltage and constant power control,and there is a strong nonlinear coupling between the multi-terminal converter stations,which brings challenges to the modeling and analysis of the system oscillation.Therefore,a modular modeling method of MMC-MTDC control system considering positive-sequence and negative-sequence control is firstly proposed in this paper.And then,aiming to the complex AC and DC grid structures,a generalized impedance model of different sections of MMC-MTDC is established with the multi-terminal nonlinear coupling considered.Finally,taking the three-terminal MMC-MTDC ring network as an example,simulation is conducted to verify the accuracy and validity of the generalized impedance model.The coupling effects of the multi-terminal interconnection system and the positive-sequence control and negative-sequence control on the impedance characteristics are analyzed,which will provide a basis for the oscillation analysis of renewable energy base connected into MMCMTDC interconnection system.

关 键 词：MMC-MTDC 通用化阻抗模型 宽频振荡 正负序控制 多端耦合 

分 类 号：TM7[电气工程—电力系统及自动化]