含三相并网逆变器的新型电力系统故障特性研究  

Research on Fault Characteristics of Novel Power Systems with Three-Phase Grid-Connected Inverters

作　　者：沈位军 SHEN Weijun(Gong′an County Power Supply Company,State Grid Hubei Electric Power Co.,Ltd.,Gong′an 434000,Hubei Province,China)

机构地区：[1]国网湖北省电力有限公司公安县供电公司,湖北公安434000

出　　处：《电力与能源》2024年第6期701-704,共4页Power & Energy

摘　　要：随着新能源发电系统装机容量的持续增长,当电网发生故障时,新能源发电系统的输出电流特性与传统发电机组存在较大差异,这会影响继电保护系统动作,进而危害电力系统安全。在分析了三相并网逆变器拓扑、数学模型、控制策略的基础上,讨论了当电网发生短路故障时并网逆变器输出的故障电流特性,并考虑了新能源发电技术的低电压穿越能力。最后搭建仿真模型验证了推导的并网逆变器输出故障电流模型的有效性。As the installed capacity of new energy power generation systems continues to increase,there is a sig-nificant difference between the fault current characteristics of traditional generator units and those of new energy power generation systems when a fault occurs in the grid.This difference affects the operation of the relay protec-tion system,thus threatening the safety of the power system.Based on an analysis of the topology,mathematical model,and control strategy of three-phase grid-connected inverters,this paper discusses the fault current charac-teristics of the grid-connected inverter when a short-circuit fault occurs in the grid,considering the low-voltage ride-through capability of new energy power generation technology.Finally,a simulation model is built to verify the effectiveness of the derived fault current model of the grid-connected inverter.

关 键 词：三相并网逆变器 故障电流 新型电力系统 

分 类 号：TM464[电气工程—电器]