Optimization of Backup Power Automatic Switching Strategy in the Distribution Network with Distributed Photovoltaics

Large-scale distributed photovoltaics (DPs) are connected to the distribution network. when a fault happens in the distribution network, the bus voltage at the fault location cannot immediately decrease to zero due to the existence of DPs, which invalidates the criteria of non-voltage detection and synchronism check and impedes the automatic switching of backup power. Therefore, considering the influence of DPs, this paper puts forward a configuration optimization scheme of backup power automatic switching (BPAS) strategy, which allows the BPAS devices in the distribution network with DPs to conduct non-voltage detection and synchronism check. The example analysis shows that the optimized BPAS strategy can effectively improve the load transfer capacity and reduce the cost of BPAS devices.