Integrated dynamic simulation of photovoltaic installations and its Low Voltage Ride-Through capability analysis

Low Voltage Ride-Through (LVRT) capability concerning large scale grid-connected photovoltaic (PV) installations was one of the main issue addressed in recent research. In order to test the dynamic grid support ability of the proposed PV power plants in Qinghai Power grid, a completed PV station model and a simplified power system model are used in the simulation work. Scope of this paper is to introduce an integrated design method of PV stations using DIgSILENT Power Factory and Matlab/Simulink. This method enables a fast and effective access to complex PV system modeling and analysis. As indicated by the simulation results, the solar PV inverter with first-order AC filter can remain connected to the grid during fault conditions, and effectively provide reactive power support afterwards. Thus, the LVRT requirements for these PV stations are satisfied.