混合型MMC系统直流故障穿越性能研究  

Research on DC Fault Ride Through Performance of Hybrid MMC System

作　　者：刘路路[1,2] 胡四全 韩坤宣[1,2] 佳卓 LIU Lu-lu;HU Si-quan;HAN Kun;XUAN Jia-zhuo(XJ Group Corporation,Xuchang 461000,China)

机构地区：[1]许继集团有限公司,河南许昌461000 [2]许继电气股份有限公司,河南许昌461000 [3]国网浙江省电力有限公司,浙江杭州310007

出　　处：《电力电子技术》2020年第2期106-108,共3页Power Electronics

基　　金：国家电网公司总部科技项目(52110417001J)。

摘　　要：针对半桥子模块(HBSM)、全桥子模块(FBSM)及箝位双子模块(CDSM)这3种子模块混合级联模块化多电平换流器(MMC),首先研究了混合型MMC的直流故障机理,此处提出了混合型MMC具备直流故障穿越的约束条件。然后,基于直流电压为±1 200 V、额定容量为20 kVA的21电平混合型MMC系统试验样机,对混合型MMC系统直流故障穿越特性进行研究。试验结果表明,直流故障发生后,混合型MMC系统通过闭锁换流器以阻断短路故障电流,在直流短路故障期间,交流断路器无跳间,且直流短路故障清除后,换流器在10 ms内重新解锁并恢复至稳定运行。The three submodule hybrid cascaded modular multilevel converter(MMC) which composed of half-bridge submodule(HBSM),full-bridge submodule(FBSM) and clamped dual-submodule(CDSM).Firstly,the DC fault mechanism of hybrid MMC is studied and the constraint condition of hybrid MMC with DC fault ride through is proposed.Then a prototype of 21 level hybrid MMC system with DC voltage±1 200 V,rated capacity 20 kVA is developed.The DC fault ride through characteristics of hybrid MMC system are studied.The test results show that,after the DC faults occurs,the hybrid MMC system blocks the short-circuit fault current by blocking the converter,during DC short-circuit faults,no trip for AC circuit breaker and after DC short-circuit fault is cleared,the converter deblock within 10 ms and recovers rated operation state.

关 键 词：模块化多电平换流器 子模块混合级联 故障穿越 

分 类 号：TM46[电气工程—电器]