Modelling of photovoltaic power plants and loads for dynamic simulations in power system

This paper presents an effect to power system when high penetration of photovoltaic (PV) power plants are increased in a conventional power system. Firstly, the behaviors of the PV array model are studied before PV power plants are connected to the conventional system represented by the IEEE 39 Bus system. A control system consisting of maximum power point tracking (MPPT) controller, voltage source controller (VSC), DC-DC boost converter and AC-DC inverter is modeled to operate along with other equipment in the system. The simulations are subsequently carried out to observe the effect of different disturbance conditions, i.e. three phase fault as well as tripping of load and generator in the system. The results of PV integration to the system coordinated with different disturbance conditions expose that a greater number of PV in the power system leads to higher power system instability and unreliability.