求翻译：微网和配电网（大电网）并网时，配电网的容量比微网容量大很多，模型一般用一个容量无限大的理想源代替，通过母线电压电流功率检测判断微网与主配电网是否发生故障或者电能质量是否满足要求，进而通过开断与闭合微网并网开关（PCC）实现微网孤网与并网切换，其PSCAD系统仿真图如图2所示是什么意思？

Micro-network and distribution network (grid) grid, with grid capacity than the micro-grid capacity much larger, the model tends to be used an infinite capacity ideal source instead of through the bus voltage and current power detector to determine whether micro-network with the main distribution ne

Micro-networks and power distribution network (grid) and Internet distribution network, the capacity than the Mini-network capacity is much larger than a general model, with a capacity of infinite source, desired by bus voltage and current power test whether micro-web as the main power distribution

When the micro net and the distribution network (big electrical network) incorporates, the distribution network capacity are greatly very more than the micro net capacity, the model replaces generally with a capacity infinitely great ideal source, judges the micro net and the main distribution netwo

Micro-network and distribution network (large grid) grid-connected Shi, distribution grid of capacity than micro-network capacity large many, model General with a capacity unlimited large of ideal source instead of, through bus voltage current power detection judgment micro-network and main distribu