Stability and Power Quality Improvement for Grid- Connected Photovoltaic Systems using Proportional Resonant Controller

In this paper control of the PV array connected to the grid is investigated. Two-stage inverters are controlled in order to achieve MPPT from PV array, transfer energy to the grid without perturbation of the grid stability, as well as improving power quality at the PCC using Optimized Perturbation and Observation (OP&O) and decoupled control, which is based on Proportional Resonance Control (PRC) respectively. The performance of the proposed control algorithms are tested using Matlab/Simulink under extreme cases as, presence of nonlinear load and climate condition change.