计及直流电压控制的MMC换流站阻抗建模及其稳定性分析  

Impedance Characteristic and Integration Stability Research on Modular Multilevel Converter With Consideration of DC Voltage Controller

作　　者：黄通[1] 陈新[1] 张东辉 陈杰[1] HUANG Tong;CHEN Xin;ZHANG Donghui;CHEN Jie(Jiangsu Key Laboratory of New Energy Generation and Power Conversion(Nanjing University of Aeronautics&Astronautics),Nanjing 210016,Jiangsu Province,China)

机构地区：[1]江苏省新能源发电与电能变换重点实验室(南京航空航天大学),江苏省南京市210016

出　　处：《中国电机工程学报》2023年第11期4273-4283,共11页Proceedings of the CSEE

基　　金：国家电网公司科技项目(新能源发电集群接入多端柔性直流输电系统次超同步振荡仿真分析及验证)。

摘　　要：多端柔性直流系统直流母线的动态特性对模块化多电平换流器(modular multilevel converter,MMC)换流站阻抗特性及系统稳定性存在较大的影响,然而目前大多数针对柔性直流系统稳定性分析的研究,将直流侧简化为直流电压源,导致研究结果在某些工况下缺乏实用性。文章采用多谐波线性化方法,建立考虑直流电压控制的MMC序阻抗模型,说明考虑直流电压控制对准确分析并网系统稳定性问题的必要性,讨论直流电压控制参数的影响因素,探究直流电压控制参数的稳定边界条件,并提出两种基于直流电压控制的MMC阻抗优化方法,实现了并网系统稳定性的有效提升。论文在Matlab/Simulink中搭建考虑直流电压控制的MMC-HVDC并网站仿真模型,对其序阻抗模型、并网稳定性分析及阻抗优化与重塑方法进行验证。The dynamic of DC bus has large impacts on the impedance characteristics of MMC and the system stability in a high voltage direct current system.However,most of the current studies on MMC-HVDC system stability simplify the DC side as a DC voltage source,which will lead to the lack of practicality of the research results under certain operating conditions.First,a sequence impedance model considering DC voltage control is developed which can be used to illustrate the necessity of DC voltage control in the MMC-HVDC system stability analysis.Then,the influencing factors of DC voltage control parameters are discussed.The boundary conditions of DC voltage control parameters are given as well.Finally,two methods of MMC impedance optimization based on DC voltage control are proposed to improve the MMC-HVDC system stability effectively.The accuracy of the sequence impedance model and the effectiveness of impedance optimization methods proposed in this paper are verified in Matlab/Simulink.

关 键 词：模块化多电平变换器 序阻抗建模 直流电压控制 稳定性分析 

分 类 号：TM712[电气工程—电力系统及自动化]