Two-stage Voltage Control Method in Photovoltaic Poverty Alleviation Areas

Abstract

Lots of distributed photovoltaic grid-connected in photovoltaic poverty alleviation areas is the main reason for the voltage limit of the distribution network with low voltage. Therefore, this paper proposes a two-stage method that controls voltagewith the photovoltaic storage system. The first stage adopts the distributed control of the photovoltaic inverter. When the light is sufficient, the inverter works in MPPT mode, and at night it works in STATCOM mode. The utilization rate of the inverter is the consistent goal. If the voltage is still not within the safety threshold, enter the distributed-local coordinated control of energy storage in phase two, and control the charging and discharging rate by combining the consistency target of the energy storage utilization rate and SoC local information. In Matlab/Simulink, a low-voltage power distribution system for photovoltaic poverty alleviation areas was built, and the simulation results show that the voltage over-limit problem in this area has been effectively solved.