弱电网下VSC的多维度建模及稳定性分析  

Multi-dimensional Modeling and Stability Analysis of VSC Connecting to Weak Grid

作　　者：赵雨童 高飞[1,2] 俞嘉浩 张博深 郑启鹏 ZHAO Yutong;GAO Fei;YU Jiahao;ZHANG Boshen;ZHENG Qipeng(Key Laboratory of Control of Power Transmission and Conversion,Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China;School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学电力传输与功率变换控制教育部重点实验室,上海200240 [2]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《高电压技术》2022年第1期220-231,共12页High Voltage Engineering

摘　　要：为研究弱电网下电压源型变换器(voltage source converter,VSC)的稳定性,建立了3个维度下的小信号阻抗模型,具体为从交流侧维度建立的多输入多输出(multiple input multiple output,MIMO)模型、从直流侧维度建立的单输入单输出(single input single output,SISO)模型和从系统控制回路维度建立的SISO模型。基于上述模型分析了弱电网下VSC的d-q轴耦合机理以及其对稳定性研究的影响,在此基础上进一步研究了电网强度,恒功率负荷和外环控制带宽对系统稳定性的影响;验证了不同维度下的阻抗模型在系统稳定性判断的一致性,并分析了各模型的特点。In order to study the stability of voltage source converter(VSC)in a weak gird,impedance models in three dimensions are established,which are multiple-input-multiple-output(MIMO)model in AC side dimension,single-input-single-output(SISO)model in control-loop dimension and SISO model in DC side dimension.Based on the established models,the d-q axis coupling mechanism of VSC under a weak grid condition and its influence on system stability are analyzed.Furthermore,the relationship between grid strength,constant power load and system stability is studied.The Nyquist curves and pole-zero map illustrate the consistency of the impedance models in system stability assessment under different dimensions.The feature of each model is further analyzed.

关 键 词：弱电网 耦合机理 多输入多输出系统 单输入单输出系统 恒功率负载 

分 类 号：TM46[电气工程—电器] TM712