摘要
分布式电源(distributed generation,DG)的并网运行改变了传统单辐射式供电网络结构,同时潮流和负荷电流的双向流动影响了电力系统的安全稳定运行。针对分布式新能源接入10 kV配电网场景下的线路保护适应性进行分析,根据分布式电源接入位置不同,理论分析了新能源电源接入造成的助增电流、外汲电流、反向电流等对配电网现有保护的影响,明晰了分布式电源容量对保护性能的影响,量化了10 kV配电网保护性能边界条件,对于后续的保护配置方案以及保护新原理的研究提供理论支撑。仿真结果验证了保护适应性分析的正确性。
Distributed generation(DG)connected to a power network has changed the traditional single-radiation power supply network structure,while the two-way power flow and load current affect the safe and stable operation of power systems.In this study,the line protection adaptability under the scenario of DG connected to a 10 kV distribution network is analyzed.Based on the different locations of distributed generation,the effects of the infeed current,outflow current,and reverse current on the existing protection of the distribution network are analyzed theoretically.The effect of the power capacity of DG on the protection performance is clarified.Moreover,the protection performance boundary conditions of a 10 kV distribution network are quantified.This study provides theoretical support for subsequent research on protection configuration schemes and new protection principles.The simulation results verify the accuracy of the protection adaptability analysis.
作者
袁兆祥
张翼
聂铭
李猛
和敬涵
YUAN Zhaoxiang;ZHANG Yi;NIE Ming;LI Meng;HE Jinghan(State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China;State Grid Corporation of China,Beijing 100031,China;School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《电力建设》
CSCD
北大核心
2024年第2期49-57,共9页
Electric Power Construction
基金
国家电网有限公司科技项目“面向新型电力系统的配电网二次系统规划设计关键技术研究”(5400-202256273A-2-0-XG)。
关键词
分布式电源(DG)
10
kV配电网
保护适应性
边界条件
distributed generation(DG)
10 kV distribution network
protection adaptability
boundary conditions
