基于模块化多电平换流器的限流式统一潮流控制器的设计  

Unified Power Flow Controller Design with Fault Current Limiting Based on Modular Multilevel Converters

作　　者：周洋[1] 江道灼[1] 陈峰[1] 唐伟佳 胡鹏飞[1] 尹瑞[1] 

机构地区：[1]浙江大学电气工程学院,杭州市310027

出　　处：《电力建设》2015年第5期7-13,共7页Electric Power Construction

基　　金：国家高技术研究发展计划项目(863计划)(2012AA050402);浙江省重点科技创新团队项目(2010R50004)~~

摘　　要：传统基于电压源换流器(voltage source controller,VSC)的统一潮流控制器(unified power flow controller,UPFC)开关频率高、输出电压谐波大、电压等级低,同时在运行过程中也有遭受短路故障的可能性和风险,特别是在大容量高电压的场合下,极易造成器件的损坏。将模块化多电平换流器(modular multilevel converter,MMC)引入UPFC中,同时改进MMC的控制策略以适应所提拓扑的要求,同时由于MMC的引入,短路故障的风险进一步加大,因此在M M C-UPFC的基础上设计了限流模块,该限流模块能在系统短路故障下有效地抑制短路电流,且该限流器在正常工作情况下并不会给线路增加负担。整个UPFC的拓扑具有模块化程度高、谐波小、容量扩展、短路快速限流等特点,该文所设计的拓扑增加了系统的可靠性、安全性和经济性。Traditional unified power flow controller（ UPFC） based on voltage source controller（VSC） has high switch frequency,obvious voltage harmonic and lower voltage level. Meanw hile,UPFC has big risk and possibility to suffer the short circuit fault,which can cause the damage to device,especially in the situation of large capacity and high voltage.Thus,this paper applied modular multilevel converter（ M M C） in the UPFC,and improved the control strategy of M M C to meet the requirements of the proposed topology,but the system might suffer larger risk of short circuit fault. So this paper also designed the current limiting module based on M M C-UPFC,which could effectively restrain the short-circuit current in the short circuit fault,w ithout increasing any burden to the system in the normal condition. In all,the topology of entire UPFC system has advantages of higher modularity level,smaller harmonic wave,capacity extension,rapid current-limiting in short circuit fault and so on,which can increase system＇s reliability,safety and economy for the designed topology.

关 键 词：柔性交流输电系统 统一潮流控制器(UPFC) 故障限流 模块化多电平换流器(MMC) 

分 类 号：TM76[电气工程—电力系统及自动化]