MMC型统一电能质量控制器故障分析及保护策略  

Failure Analysis and Protection Strategy for MMC-UPQC

作　　者：陆晶晶 刘正富[2] 张剑 袁敞 肖湘宁 杨用春 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市102206 [2]广东电网公司电力科学研究院,广州市510080

出　　处：《电力建设》2015年第5期31-36,共6页Electric Power Construction

基　　金："十二五"国家科技支撑计划重大项目(2011BAA01B02);中央高校基本科研业务费专项资金资助项目(12QN37)~~

摘　　要：模块化多电平换流器(modular multilevel converter,MMC)拓扑结构引入统一电能质量控制器(unified power quality conditioner,UPQC),既能够提高UPQC的容量又可以提高UPQC的电压等级,从而扩展了UPQC在中压领域的应用,使UPQC具有更加广阔的适用前景。然而当负载侧出现短路故障时,如何合理地操作保证其安全可靠地运行,不仅是系统对装置的要求,更是装置保护自身的要求。针对上述情况提出了应用于MMC型UPQC(MMC-UPQC)故障保护策略制定的原则,采用反并联晶闸管支路与线路断路器之间的动作配合,将串联MMC与故障线路隔离开,最终实现有效保护装置的目的。PSCAD/EMTDC环境下的仿真结果验证了所提方法的有效性及可行性。Applying the topology structure of modular multilevel converter（ MMC） in unified power quality controller（ UPQC） can improve the applicative capacity and voltage level of UPQC,which can expand the application of UPQC in medium voltage field,and make UPQC has wider application prospects. However,when the short-circuit fault occurs on the load side,how to logically operate to ensure the safe and reliable operation of UPQC,is not only the system requirement for the device,but also its own requirement for the device to protect itself. On this basis,this paper presents the principle of fault protection strategy for M M C-UPQC,which adopts the interaction betw een the branch of anti-parallel thyristor and circuit breaker to isolate the M M C in series from the fault line,and ensure the effective protection for the device. The simulation results in PSCAD / EM TDC environment have demonstrated the effectiveness and feasibility of the proposed method.

关 键 词：统一电能质量控制器(UPQC) 模块化多电平换流器(MMC) 故障保护 断路器 反并联晶闸管 

分 类 号：TM76[电气工程—电力系统及自动化]