柔性中压直流配电网线路保护方案

发布时间：2018-06-13 12:03

本文选题：直流配电系统 + 直流断路器　；参考：《电力系统自动化》2017年17期

【摘要】：针对"手拉手"多端柔性直流配电系统的中压直流线路,设计了基于通信系统和直流断路器的继电保护方案。首先,介绍了柔性直流配电系统的配置和中压直流系统的故障特性;其次,针对系统危害较大的极间短路故障和小电阻接地故障,依靠电流量信息,根据每一保护安装处的线路电流状态矩阵,设计了能够识别故障类型和故障区间、在5ms内隔离故障的速动保护;针对系统可能出现的大电阻接地故障情况,设计了以电压不平衡量作为启动判据,根据同一保护安装处的正负极不平衡电流状态矩阵,实现故障定位和故障隔离的后备保护;并针对可能出现的保护拒动或通信装置失灵现象设计了第一级远后备保护和第二级远后备保护;还考虑了保护系统和控制系统的配合以保证非故障区域的正常供电。最后,通过PSCAD/EMTDC仿真验证了所提保护方案的有效性。
[Abstract]:A relay protection scheme based on communication system and DC circuit breaker is designed for the middle voltage DC circuit of multi-terminal flexible DC distribution system. Firstly, the configuration of the flexible DC distribution system and the fault characteristics of the medium-voltage DC system are introduced. Secondly, for the inter-pole short-circuit fault and the low-resistance grounding fault, which are harmful to the system, the current information is relied on. According to the line current state matrix of each protection installation, the quick protection which can identify the fault type and fault interval and isolate the fault in 5ms is designed. According to the state matrix of positive and negative pole unbalance current in the same protection installation, the backup protection for fault location and fault isolation is designed with voltage unbalance as the starting criterion. The first stage remote backup protection and the second stage remote backup protection are designed for the possible failure of protection or communication device, and the cooperation of protection system and control system is considered to ensure the normal power supply in the non-fault area. Finally, the effectiveness of the proposed protection scheme is verified by PSCAD / EMTDC simulation.
【作者单位】：河北省分布式储能与微网重点实验室(华北电力大学);
【基金】：国家重点研发计划资助项目(2016YFB0900203) 国家自然科学基金资助项目(51307059) 中央高校基本科研业务费专项资金资助项目(2017MS096)~~
【分类号】：TM773

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