不对称工况模块化多电平换流器稳定性分析的矩阵降维  

Matrix Dimensionality Reduction for Stability Analysis of Modular Multilevel Converters Under Asymmetric Conditions

作　　者：汪娟娟[1] 王泽昊 刘岳坤 冯俊杰 傅闯 WANG Juanjuan;WANG Zehao;LIU Yuekun;FENG Junjie;FU Chuang(School of Electric Power,South China University of Technology,Guangzhou 510641,China;State Key Laboratory of HVDC(Electric Power Research Institute of China Southern Power Grid Company Limited),Guangzhou 510663,China;State Key Laboratory of Advanced Electromagnetic Technology(Huazhong University of Science and Technology),Wuhan 430074,China)

机构地区：[1]华南理工大学电力学院,广东省广州市510641 [2]直流输电技术全国重点实验室(中国南方电网科学研究院有限责任公司),广东省广州市510663 [3]强电磁技术全国重点实验室(华中科技大学),湖北省武汉市430074

出　　处：《电力系统自动化》2024年第13期147-159,共13页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(52277102);国家重点研发计划资助项目(2023YFB2405900)。

摘　　要：模块化多电平换流器(MMC)在对称工况下的建模与稳定性分析已经得到了广泛关注。实际工程中的MMC会处于不对称运行工况,如桥臂电感不对称、交流侧电压不对称等,不对称工况下的导纳建模与稳定性分析需要进一步展开研究。目前,考虑系统多频耦合的导纳模型与定量的导纳降维方法是不对称工况稳定性分析的难点。因此,文中主要建立了适用于不对称工况的MMC导纳模型,并对适用于MMC不对称工况下小扰动稳定性分析的矩阵降维方法展开研究。该降维方法基于导纳矩阵的向量范数,适用于“黑箱”系统及各种不对称工况,可定量评估各阶导纳矩阵的降维误差量。以中国鲁西背靠背异步联网工程广西侧为例,通过PSCAD/EMTDC电磁暂态仿真验证了所建模型的准确性及所提降维方法在多种不对称工况下的适用性。The modeling and stability analysis of modular multilevel converter(MMC)under symmetric conditions has received extensive attention.In practical engineering,MMC might be in asymmetric conditions,such as asymmetric inductance of the bridge arm and asymmetric voltage on the AC side.The admittance modeling and stability analysis under asymmetric conditions need to be further studied.At present,considering the admittance model of the system with multi-frequency coupling and the quantitative admittance dimensionality reduction methods are the difficulties in the stability analysis of asymmetric conditions.Therefore,this paper mainly establishes the MMC admittance model suitable for asymmetric conditions,and studies the matrix dimensionality reduction method suitable for small disturbance stability analysis under MMC asymmetric conditions.The dimensionality reduction method is based on the vector norm of admittance matrix.It is suitable for“black box”system and various asymmetric conditions,and can quantitatively evaluate the dimensionality reduction error of the admittance matrix with each order.Taking the Guangxi-side model of Luxi back-to-back asynchronous grid-connection project of China as a case,PSCAD/EMTDC electromagnetic transient simulation is used to verify the accuracy of the proposed model and the applicability of the proposed dimensionality reduction method under various asymmetric conditions.

关 键 词：模块化多电平换流器 导纳建模 不对称工况 降维 稳定性分析 

分 类 号：TM46[电气工程—电器] TM721.1