柔性直流配网极间故障控制保护策略与主设备参数配合研究

发布时间：2018-02-15 13:24

本文关键词： 柔性直流配电网保护配置直流线路极间故障　出处：《电力系统保护与控制》2016年21期 　论文类型：期刊论文

【摘要】：直流配电网在改善供电可靠性和电能质量、实现分布式电源无扰并网以及城市直流负荷接入等方面,相比交流配网有较大优势。然而直流线路具有故障电流上升速度快、峰值大的特点,极易损坏换流器件及设备绝缘,因此,对直流线路的故障处理提出了较高的要求。基于MMC的柔性直流配电网可以通过接地方式的设计实现直流线路单极故障穿越,而危害更大的极间短路故障尚无很好的处理方法。以背靠背典型两端直流配电网为例,分析了直流线路极间短路故障时的暂态特性及其对交流系统、换流器及直流侧的影响。分析了极间故障时的控制保护策略及其与主要设备参数的配合关系。在电磁暂态仿真软件PSCAD/EMTDC下进行了直流线路极间短路故障的仿真研究,验证了该控制保护配置与主设备参数配合策略的正确性。
[Abstract]:The DC distribution network has great advantages over AC distribution network in improving the reliability and quality of power supply, realizing the distributed power supply without disturbance and connecting to the city DC load. However, the DC line has a fast rise speed of fault current. High peak value, easy to damage converter devices and equipment insulation, therefore, This paper puts forward higher requirements for the fault treatment of DC line. The flexible DC distribution network based on MMC can realize the unipolar fault traversing of DC line through the design of grounding mode. However, there is no good way to deal with the more harmful inter-pole short-circuit fault. Taking the typical back-to-back typical two-terminal DC distribution network as an example, the transient characteristics of the inter-pole short-circuit fault of DC line and its effect on AC system are analyzed. The effects of converter and DC side are analyzed. The control protection strategy and its coordination with the main equipment parameters are analyzed. The simulation research of the short-circuit fault between the poles of DC line is carried out under the electromagnetic transient simulation software PSCAD/EMTDC. The correctness of the control protection configuration and the main equipment parameter matching strategy is verified.
【作者单位】：北京四方继保自动化股份有限公司;深圳供电局电力技术研究中心;
【基金】：国家863课题“紧凑化多端柔性直流配电网控制保护关键技术”(2015AA050103)~~
【分类号】：TM721.1

【相似文献】