Influence of the parameter settings of inverter's protection system on isolated grid operation with photovoltaic power station connected

The protection's setting values set according to 《 Technical rules for photovoltaic power station connected to Power Grid for State Grid Corporation of China》 may bring adverse influence to stable operation of the PV station connected to isolated grid with small capacity. The inverter's protection setting of the PV station connected to isolated gird is studied with PSASP software. The simulation results shows that the frequency protection's setting values of the inverters should be adjusted according to the actual frequency characteristics and operation requirements of Ali grid to improve the operational stability and power supply reliability.