EMTP Model of Grid Connected PV System

Photovoltaic energy is one of the attractive candidates for green power generation. This paper investigates the connection of a solar photovoltaic (PV) system into an AC grid by modeling the system in Electromagnetics Transients Program (EMTP-RV). In this model, the popular single diode PV cell electrical model, based on the Shockley diode equation is used. Also, the two most commonly used Maximum Power Point Tracking techniques (MPPT), namely, Perturb and Observe (P&O) and Incremental Conductance (IC) are developed and compared. The direct control strategy employs a simple PI controller for the active/reactive power. However, it suffers from coupling of the two controllers and any change in one affects the other. Simulation results are presented to demonstrate the impact of sudden changes in atmospheric conditions and other disturbances on system performance. The simulation study performed shows that the system is robust against faults and other disturbances