Simulation Models and Stability of PV Grid-Connected Power System Based on PSASP

In order to analyze the reliability and stability of PV grid-connected power system, a dynamic model of grid-connected PV power station was developed under PSASP environment. By using the User-Defined Model (UDM) of the PSASP, the photovoltaic array model, inverter model, DC–DC booster model, MPPT controller model and storage battery system model were designed, which were suitable for engineering application. Finally, based on a western isolated grid with PV power station connected, the effect of power grid trend by PV station in different output and different power factor, and the transient stability under the change of the sunshine intensity, and three-phase short-circuit fault were studied. Simulation analysis results indicated that the energy storage battery can maintain grid power balance and a constant voltage reduce the oscillation of the system after faults. The accuracy of model was proved through simulation analysis and the PV grid-connected power system was validated stable.