A transmission network model with synchronization inversion interface was built,which is based on the WSCC (Western Systems Coordinating Council) 9-Bus system. The synchronization inversion interface model simulated the connection of micro grid and superior grid and the support of micro grid for frequency and voltage of superior grid. The results show when the active and reactive load encounter a sudden change,the superior transmission system can realize the in-situ balance of active and reactive power, as well as the stabilization of the system voltage's magnitude and frequency, with the help of the access of micro grid. Furthermore, the simulation of the micro-grid system model can be achieved within the laboratory conditions, that is low-voltage and low-capacity conditions. All the simulation algorithms and the results have been verified in the PSCAD / EMTDC software and dynamic simulation lab.%文中基于美国西部联合电网(Western Systems Coordinating Council,WSCC)3机9节点系统,建立了1个带有逆变并网接口的输电网模型,并利用逆变并网接口模型模拟了微电网与上级输电网的连接,对微电网对上级电网电压与频率的支持情况进行了数字仿真.仿真结果表明在上级输电网的有功与无功负荷发生突变时,微电网的接入使上级输电系统的有功与无功功率能够实现就地平衡,并保持系统频率与电压幅值的稳定.整个微电网系统仿真环境设定均按照实验室所能达到的低电压低容量条件下完成.文中所有仿真算法及结果均在PSCAD/EMTDC软件环境及动态模拟实验室中得到验证.
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