用于多交流系统耦合下MMC-HVDC稳定性分析的模块化阻抗建模方法  

Modular impedance modeling method for stability analysis of multi-AC system coupled MMC-HVDC

作　　者：高剑[1] 朱童 杜程茂 杜雄[2] 张博 李甘[1] 叶希[1] 聂鸿宇 应林志 GAO Jian;ZHU Tong;DU Chengmao;DU Xiong;ZHANG Bo;LI Gan;YE Xi;NIE Hongyu;YING Linzhi(State Grid Sichuan Electrical Power Company,Chengdu 610041,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University),Chongqing 400044,China)

机构地区：[1]国网四川省电力公司,四川成都610041 [2]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044

出　　处：《电工电能新技术》2023年第7期48-58,共11页Advanced Technology of Electrical Engineering and Energy

基　　金：国家电网公司总部科技项目(5100-202055459A-0-0-00)。

摘　　要：模块化多电平换流器(MMC)换流站与风电或电网等交流系统之间均存在振荡风险,严重削弱了系统的稳定运行能力。阻抗分析方法是分析振荡问题的一种简单有效的手段。然而,多交流系统耦合下基于模块化多电平换流器的高压直流输电(MMC-HVDC)的阻抗建模目前尚未形成统一的认识。本文提出一种“子系统划分-交流系统阻抗提取-直流端口阻抗等效与聚合”的模块化建模思路。首先根据稳定性分析需求进行子系统划分,然后提取各交流系统的频域阻抗特性,最后采用多谐波线性化方法建立MMC换流站的直流端口阻抗模型,并依据直流网络结构进行聚合。搭建了基于Matlab/Simulink的四端MMC-HVDC系统电磁暂态(EMT)平台,仿真结果验证了模型的正确性和建模方法的有效性。There is oscillation risk between MMC station and AC system such as wind power or power grid,which seriously weakens the system stable operation ability.The impedance-based method is a simple and effective means to analyse the oscillation problem.However,the impedance modeling method of MMC-HVDC under the coupling of multiple AC systems has not yet formed an unified understanding.This paper proposes a modular modeling approach based on sub-system partitioning,AC system impedance extraction and DC port impedance equivalence and aggregation.Firstly,subsystems are divided according to the requirements of stability analysis,and then the frequency-domain impedance characteristics of each equipment are extracted.Finally,the impedance model of DC port of MMC station is established by multi-harmonic linearization method and aggregated according to the structure of DC network.The EMT platform of four-terminal MMC-HVDC system based on Matlab/Simulink is built to verify the validity of the proposed method and the correctness of the model.

关 键 词：模块化多电平换流器 直流输电网络 稳定性 阻抗建模 

分 类 号：TM46[电气工程—电器]