A single-stage three-phase grid-connected photovoltaic system with fast grid voltage regulation

摘要

On account of its stochastic generation, system voltage fluctuation is one of the impediments to further increase the penetration level of the grid-connected photovoltaic system. However, the reactive power capacity of the photovoltaic inverter can be controlled to regulate the grid voltage. In this paper, the outer current control loop, which is designed in the dq synchronous reference frame, is proposed to give the single-stage three-phase grid-connected photovoltaic system the opportunity to solve the voltage fluctuation problem during the daytime. In order to verify the performance of the presented controller, several simulations are carried out through MATLAB/Simulink in different load, solar power generation and fault conditions.