Current control of inverter based on proportional resonant and harmonic compensation

A new novel current control algorithm of proportional resonant and harmonic compensation based on LCL filter was proposed in this paper,which controlled the fundamental current and compensated the harmonic current components,meanwhile considering the influence of temperature and irradiation intensity upon the photovoltaic array electrical characteristics.The maximum power point tracking technique and power factor correction technique were integrated into the unified control system,and the impact of different proportional gain on the system stability was analyzed.The simulation results indicate that the proposed control algorithm has strong robustness and stability,the injected grid current is in phase with power grid voltage with the unity of power factor,and the obtained THD complies with the stringent standard of IEEE over the distributed power generation connected to power grid.