Photovoltaic (PV) grid inverter can’t achieve static-error-free track while using conventional proportional integral (PI) and DC component of the current injection problem of grid inverter, for which, PI and quasi-proportional resonant (PR) control strategy of PV grid current optimization is proposed. The fundamentals of PI and quasi-PR controllers are introduced, and the principle and algorithm of quasi-PR are analyzed. Quasi-PR control can achieve static-error-free tracking, and PI and quasi-PR control strategy can suppress the DC component. Results of simulative study with MATLAB/Simulink show that, the static-error-free control of grid-connected current is realized, the phase error introduced by single PI controller is eliminated, the DC component is suppressed, and the excellent grid-connected waveform is achieved.