LYU Jiale,YANG Jinggang,CHEN Qing,et al.Distributed Area Protection for DC Distribution Network Based on Current Differential State Variable[J].Automation of Electric Power Systems,2020,44(18):139-146.
LYU Jiale,YANG Jinggang,CHEN Qing,et al.Distributed Area Protection for DC Distribution Network Based on Current Differential State Variable[J].Automation of Electric Power Systems,2020,44(18):139-146. DOI: 10.7500/AEPS20200217003.
Distributed Area Protection for DC Distribution Network Based on Current Differential State Variable
Aiming at the problems of poor selectivity of single-end protection
as well as slow operation speed and strict data synchronization requirements of multi-end protection in the existing DC distribution network
this paper proposes a distributed regional protection method for DC distribution network based on current differential state variable. This method uses the load branch common access point as the boundary to divide the DC lines and uses the current differential as the fault transient characteristics. Adjacent protection devices exchange current differential status words for fault identification and area location
to achieve rapid fault location and isolation. The method only needs the exchange of fault current differential status information between adjacent protection devices. And the strict data synchronization is not required. It can be used for two-end or multi-end DC distribution networks. Simulation results show that the proposed method has fast operation speed and accurate selectivity
and has a certain ability to withstand the distributed capacitance of line and transition resistance.
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