逆变型分布式电源接入配电网的电流纵联保护研究  

Research on current longitudinal protection of distribution networks connected to inverter interfaced distributed generation

作　　者：施晓蓉[1] 李谟发[2] 周献[2] SHI Xiaorong;LI Mofa;ZHOU Xian(School of Electric and Information Engineering,Hunan Institute of Engineering,Xiangtan 411101,China;School of Wind Energy Engineering,Hunan Electrical College of Technology,Xiangtan 411101,China)

机构地区：[1]湖南工程学院电气与信息工程学院,湖南湘潭411104 [2]湖南电气职业技术学院风能工程学院,湖南湘潭411104

出　　处：《电力科学与技术学报》2023年第5期143-149,共7页Journal of Electric Power Science And Technology

基　　金：湖南省创新型省份科技重大专项(2020GK1013);湖南省教育厅优秀青年项目(22B0955);湖南省自然科学基金(2023JJ60177)。

摘　　要：针对逆变型分布式电源(IIDG)接入的配电网,首先在新的并网规程下,分析了IIDG的故障特性,提出了故障等值模型;然后根据IIDG接入配电网故障时,线路两端故障电流的比值分布情况,指出现有电流纵联保护方案不能准确区分区内外故障与高投资的缺陷,提出一种主保护结合辅助保护的电流纵联保护新方案,辅助保护只需要在主保护不能正确区分区内外故障的情况下进行配置,减少了投资。最后,通过标准的IEEE 33节点线路进行仿真,验证了该方案的可行性,为大量IIDG接入配电网后的保护提供可靠的保障。For the distribution network connected to the inverter interfaced distributed generation(IIDG),The fault characteristics of IIDG is analyzed,and the fault equivalent model is proposed under the new grid connection regulations.And then,according to the ratio distribution of fault currents at both ends of the faulty line when the IIDG is connected to the distribution network,it is pointed out that the existing current longitudinal protection scheme cannot accurately distinguish between internal and external faults and high investment.A new current longitudinal protection scheme combining main protection with auxiliary protection is proposed,which is combined with the main and auxiliary protection,the auxiliary protection only needs to be configured when the main protection cannot correctly distinguish the faults,and its cost decreased.Finally,A standard IEEE 33-node circuit simulation is set up,and the simulation results verified that the new protection scheme is practical and feasible.It provides reliable protection for the distribution network connected with large number of IIDG.

关 键 词：逆变型分布式电源 电流差动保护 配电网 等值模型 保护判据 

分 类 号：TM773[电气工程—电力系统及自动化]