基于MMC主动控制的换流变磁通退饱和方法研究  

Study on Desaturation Method for Converter Transformer Magnetic Flux Based on Active Control of MMC

作　　者：胡应宏 卢毅 雷鸣[2] 王一振 胡家睿 王之谦 HU Yinghong;LU Yi;LEI Ming;WANG Yizhen;HU Jiarui;WANG Zhiqian(State Grid Jibei Electric Power Research Institute,Beijing 100045,China;Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin 300072,China)

机构地区：[1]国网冀北电力有限公司电力科学研究院,北京100045 [2]智能电网教育部重点实验室(天津大学),天津300072

出　　处：《电力系统及其自动化学报》2024年第10期89-98,107,共11页Proceedings of the CSU-EPSA

基　　金：国网冀北电力有限公司科技项目(52018K22001C)。

摘　　要：针对真双极柔性直流输电系统中换流变和应涌流衰减缓慢、易持续对模块化多电平换流器造成暂态冲击甚至引发保护误动作的问题,提出一种基于模块化多电平换流器主动控制的换流变磁通退饱和方法。首先,在不增添辅助设备的情况下通过模块化多电平换流器为换流变提供修正电流实现磁通退饱和;然后,分析传统控制器的适应性和所提方法对模块化多电平换流器运行特性的影响,并提出应对措施;最后,基于MATLAB/Simulink进行仿真验证。仿真结果表明,所提方法可以在保证模块化多电平换流器平稳运行的基础上加快和应涌流衰减速度,有效缓解和应涌流对模块化多电平换流器的暂态冲击。In a true bipolar flexible high voltage direct current(HVDC)transmission system,the sympathetic inrush current in a converter transformer is attenuated slowly,which may cause continuous transient impact on a modular multilevel converter(MMC)and even lead to the malfunction of protection devices.To solve this problem,a desaturation method for converter transformer magnetic flux based on the active control of MMC is proposed at first,in which a correction current is provided for the converter transformer through the MMC to achieve magnetic flux desaturation without adding auxiliary equipment.Secondly,the adaptability of traditional controllers and the impact of the proposed method on the MMC’s operation characteristics are analyzed,and the countermeasures are also put forward.Finally,simulation verification is conducted based on MATLAB/Simulink,and simulation results show that the proposed method can accelerate the attenuation speed of sympathetic inrush current and effectively alleviate the transient impact of sympathetic inrush current on the MMC while ensuring the MMC’s stable operation.

关 键 词：柔性高电压直流输电 模块化多电平换流器 和应涌流 磁通退饱和 

分 类 号：TM72[电气工程—电力系统及自动化]