In more than one non-interconnect inverters composed of microgrid systerm,it should be accurated and detected rapidly of inverter output voltage phase in order to avoid the circular current.When the inverters output voltage distortion or asymmetry,the traditional PLL technology by the influence of high harmonics and negative sequence voltage component lead to oscillation frequency and inaccurate phase detection. This paper puts forward a kind of new SPLL model based on Reduced Order Resonant (ROR) combined with Second Order Generalized Integral (SOGI).By used this technique, it can effectively eliminate high harmonics and extract positive sequence component to from the fundamental voltage of the achieve respond quickly, small fluctuations and the accurate phase. The simulation results the feasibility of the method by MATLAB/Simulink.