交直流混合配电网继电保护研究综述

直流配电网能友好兼容各类分布式电源和直流负载,与现有的交流配电网构成交直流混合配电网是应对能源危机、环境污染的有效手段,但缺少可靠、稳定的继电保护技术是制约交直流混合配电网发展的重要因素。概述了国内外交直流混合配电网继电保护的研究现状。总结了直流配电网的结构、故障特性、保护原理等方面的研究,进而对交直流混合配电网的故障特性以及交直流相互作用对保护配置的影响进行分析。同时总结国内外对交直流换流器继电保护的研究。最后对交直流混合配电网继电保护技术的研究方向进行展望。

Review on relay protection of AC/DC hybrid distribution grids

The DC distribution grid can access friendly various types of distributed power supplies and DC loads. It is an effective means to deal with energy crisis and environmental pollution by forming AC-DC hybrid distribution grids with existing AC distribution grids. However, the lack of reliable and stable relay protection technology is an important factor that restricts the development of hybrid AC/DC distribution grids. The purpose of this paper is to outline the research status of relay protection for domestic and foreign DC hybrid power distribution grids. It summarizes the research on the structure, fault characteristics and protection principles of DC distribution grids, and then analyzes the fault characteristics of AC/DC hybrid distribution grids and the influence of AC-DC interactions on the protection configuration. At the same time, the research on the relay protection of AC/ DC converters is summarized. Finally, the research direction of relay protection technology for AC/DC hybrid power distribution grid is prospected. This work is supported by National Key Research and Development Program of China (No. 2017YFB0903205) and Science and Technology Plan of Guangdong Province (No. 2017A010104023).