采用MMC变流器的VSC-HVDC系统故障态研究  

Research on the VSC-HVDC System Using Modular Multilevel Converters Under Fault Condition

作　　者：刘钟淇 宋强[2] 刘文华[2] 

机构地区：[1]国电龙源电气有限公司,北京100097 [2]清华大学,北京100084

出　　处：《电力电子技术》2010年第9期69-71,共3页Power Electronics

基　　金：电力系统及发电设备控制和仿真国家重点实验室项目(SKLD09M27)~~

摘　　要：在交流侧系统电压发生不对称故障时,对基于模块化多电平变流器(MMC)的轻型直流输电系统(VSC-HVDC)的控制进行了研究。基于MMC的系统数学模型,针对故障系统中存在零序电流通路的特点,提出了故障时的系统正负零序控制器。为在故障时尽量保持原有有功功率的传输,并保证故障电流满足系统安全运行的条件,提出了故障时的系统有功功率控制策略。通过仿真软件PSCAD/EMTDC验证了所提控制器和控制策略的有效性。This paper researches the control method of the VSC -HVDC system based on modular multilevel converter（MMC） when the unbalanced fault of AC voltage occurred.Based on the mathematic model of the MMC system,considering the existence of zero-sequence path in the faulty system,the decoupled positive-negative-zero sequence controller is proposed.To maintain the transmission of the most active power,while ensure the faulty current meet the conditions of safely operation of the system,the active power control strategy under fault condition is proposed.By simulation software PSCAD/EMTDC,the effectiveness of the proposed controller and control strategy are testified.

关 键 词：轻型直流输电系统 模块化多电平变流器 控制器 

分 类 号：TM46[电气工程—电器]