MMC控制器小信号稳定性判据研究  

Research on a small-signal stability criterion for MMC controller

作　　者：伍双喜 刘洋 朱誉 王姗 郑乐 WU Shuangxi;LIU Yang;ZHU Yu;WANG Shan;ZHENG Le(Eletric Power Dispatching and Control Center of Guangdong Power Grid Co.,Ltd,Guangzhou 510030,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(NCEPU),Beijing 102206,China)

机构地区：[1]广东电网有限责任公司电力调度控制中心,广州510030 [2]新能源电力系统全国重点实验室(华北电力大学),北京102206

出　　处：《浙江电力》2024年第8期36-46,共11页Zhejiang Electric Power

基　　金：南方电网公司科技项目(GDKJXM20220335);国家自然科学基金(52307095)。

摘　　要：基于MMC(模块化多电平换流器)的高压直流输电广泛应用于大规模新能源外送,然而MMC控制器的惯性滞后特性可能带来小信号稳定性问题。首先,分析同步发电机的机械惯性,类比提出适用于MMC控制器的惯性二阶统一表达式。然后,基于MMC闭环控制器的动态特性和惯性滞后特性,提出连接弱电网的MMC控制器的小信号稳定性判据。最后,通过对双侧MMC并网系统的仿真分析,验证了所提稳定性判据的正确性。High voltage direct current(HVDC)transmission based on modular multilevel converter(MMC)is widely used in large-scale renewable energy delivery.However,the lagged inertia of MMC controllers may under⁃mine the small-signal stability.Firstly,the mechanical inertia of synchronous generators is analyzed,and a second-order unified expression of inertia applicable to MMC controller is proposed.Secondly,based on the dynamic and in⁃ertial delay of MMC closed-loop controller,a small-signal stability criterion for MMC controller connected to weak power grid is presented.Finally,through simulation analysis of a double-side MMC grid-connected system,the cor⁃rectness of the proposed stability criterion is validated.

关 键 词：模块化多电平换流器 闭环控制器 控制器惯性 控制器增益 小信号稳定性 

分 类 号：TM46[电气工程—电器] TP273[自动化与计算机技术—检测技术与自动化装置]