柔性直流电网超高速保护方案研究

发布时间：2018-08-28 09:30

【摘要】：柔性直流电网发生直流短路故障时,为保障非故障线路持续正常运行,需要快速隔离故障线路。传统柔性直流输电线路保护动作时间过长,无法满足速动性要求。为此首先对柔性直流电网直流短路故障特性进行分析,得到超高速保护动作时间指标;然后借鉴常规直流超高速保护策略,考虑直流线路故障与直流母线故障的甄别方法,提出一种适用于柔直电网的超高速保护方案,采用行波保护、电压突变量保护与电流突变量保护相结合的方式实现直流短路故障的快速检测和定位,利用双端线路故障检测结果实现保护动作快速出口,能够满足直流短路故障保护的快速性要求。最后在PSCAD/EMTDC中搭建仿真模型对超高速保护方案进行了仿真验证。
[Abstract]:When DC short circuit fault occurs in flexible DC power network, it is necessary to isolate the fault line quickly in order to ensure the continuous normal operation of non-fault line. The operation time of the traditional flexible DC transmission line protection is too long, which can not meet the requirement of quick motion. For this reason, the characteristics of DC short circuit fault of flexible DC power network are analyzed firstly, and the operation time index of super high speed protection is obtained, and then the identification method of DC line fault and DC bus fault is considered by reference to the conventional DC super high speed protection strategy. An ultra-high speed protection scheme suitable for flexible and straight power system is proposed. The combination of traveling wave protection, voltage sudden change protection and current abrupt change protection is used to detect and locate DC short circuit fault quickly. Using the fault detection result of double terminal line to realize the fast exit of protection action, it can meet the requirement of DC short circuit fault protection. Finally, a simulation model is built in PSCAD/EMTDC to verify the super-high-speed protection scheme.
【作者单位】：许继电气股份有限公司;西安许继电力电子技术有限公司;
【基金】：国家重点研发计划项目(柔性直流工程成套设计与系统集成及其工程示范应用,2016YFB0900905)~~
【分类号】：TM721.1

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