文章摘要
朱思丞,赵成勇,许建中.含多类型故障限流设备动作的直流电网保护时序配合[J].电力系统自动化. DOI: 10.7500/AEPS20180826003.
ZHU Sicheng,ZHAO Chengyong,XU Jianzhong.Time-sequance Coordination Protection in DC Grid Including Operation of Multi-type Fault Current Limiting Devices[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20180826003.
含多类型故障限流设备动作的直流电网保护时序配合
Time-sequance Coordination Protection in DC Grid Including Operation of Multi-type Fault Current Limiting Devices
DOI:10.7500/AEPS20180826003
关键词: 柔性直流电网  保护时序配合  故障限流器  混合型模块化多电平换流器  直流断路器
KeyWords: HVDC grid  protection timing coordination  fault current limiter (FCL)  hybrid modular multilevel converter  dc circuit breaker (DCCB)
上网日期:2019-04-12
基金项目:
作者单位E-mail
朱思丞 华北电力大学 zsc4572@126.com 
赵成勇 华北电力大学 chengyongzhao@ncepu.edu.cn 
许建中 华北电力大学 xujianzhong@ncepu.edu.cn 
摘要:
      柔性直流电网作为新能源并网的有效手段,要求能够可靠开断直流故障电流。直流电网中配置的多种类型故障限流设备间的故障保护时序配合亟需研究。本文基于直流电网直流线路双极短路故障,研究了故障限流器、直流断路器、半桥全桥混合型模块化多电平换流器以及DC/DC变换器这几类多类型故障限流设备的故障保护时序配合。针对包含环网状以及辐射状结构的复合型多端直流电网系统中的不同区域,配置不同类型的故障限流设备,同时本文采用检测故障电流变化率的方法判断直流断路器是否可靠动作。根据不同的故障区域,提出了相应的故障限流设备间的保护时序配合方案,并且考虑了部分限流设备如直流断路器拒动后其他限流设备的动作逻辑。在PSCAD / EMTDC仿真中验证了本文提出的直流电网中多类型限流设备保护时序的可靠性和有效性。
Abstract:
      As an effective means for renewable energy integration, the flexible HVDC grids require reliable breaking of DC fault currents. The fault protection timing coordination among various fault current limiting devices configured in the DC grid needs to be studied. In this paper, based on the pole-to-pole short circuit faults of HVDC grids, the fault protection timing logics of multi-type fault current-limiting devices such as fault current limiters (FCL), DC circuit breakers (DCCB), DC/DC converters, and hybrid modular multilevel converters composed of half-bridge and full-bridge sub-modules are studied. Various current limiting devices are configured for different areas of the compound multi-terminal HVDC grid system including the meshed network and radial structure. Then, the meth-od of detecting the change rate of the fault currents to determine whether the DCCB is operating reliably. Ac-cording to various fault areas, the timing coordination between fault current-limiting devices is proposed, and the backup timing logics coordination of some current-limiting devices such as the rejecting operation of DCCBs, are provided. The simulation results in PSCAD / EMTDC have validated the reliability and validity of the multi-type current-limiting devices protection timing logics coordination in the compound multi-terminal HVDC grid.
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