Fast Electromagnetic Transient Simulation Model of Photovoltaic Power System

Because of the converter power electronic equipment, photovoltaic (PV) power system electromagnetic transient simulation is small step and slow. For practical simulation of large-scale PV power system, it is essential to have numerically efficient models. Based on the principle of PWM modulation, the simplified equivalent AC-DC controlled source model by averaged switching function was established and the unified averaged equivalent DC-DC model in the discontinuous conduction mode (DCM) and continuous conduction mode (CCM) was proposed. And the convert normal operation and the low-voltage-ride-through control strategies were also researched. Finally, the fast electromagnetic transient simulation model of PV power system based on the averaged convert models with control strategies was established based on PSCAD/EMTDC simulation software, and the model validation was carried out from model correctness, simulation step adaptability and simulation speed.