Abstract: The microgrid contains a large number of inverter based distributed generators (IBDGs), whose operation control and fault characteristics are different from that of traditional synchronous generators. The inverter control mode of IBDG is analyzed. The simulation models of different operation control modes (grid-connected operation and islanding operation) of IBDG in the microgrid are established on the DIgSILENT simulation software. The fault characteristics of both IBDG side and distribution line side, and the influences on the fault protection under different operation control modes are analyzed and compared, which provides the basis for the protection strategy of the distributed power microgrid.

Key words: Inverter based distributed generator (IBDG), microgrid modeling, islanding operation, fault simulation

摘要： 微网中含有大量的逆变型分布式电源（IBDG），其运行控制及故障特性与传统同步发电机不同。分析了IBDG的逆变器控制方式，在DIgSILENT仿真软件上建立了微网在不同运行控制模式（并网、孤岛）下IBDG的控制模型。分析了在不同控制下线路发生短路故障时IBDG侧与线路侧的故障特性，比较分析了微网不同运行控制模式下故障保护受到的影响，为含IBDG的微网保护策略提供依据。

关键词: 逆变型分布式电源, 微网建模, 孤岛运行, 故障仿真