Dual Control of Single-Phase Grid-Connected PV System for Harmonics Mitigation

The widespread adaptation of distributed generations (DGs), such as solar photovoltaic (PV) systems, wind generation etc., is rapidly becoming a necessity in response to rising energy demands. Imbalance of DC input and AC output powers causes grid voltage imbalance at the end of DC-link voltage in a single-phase two-stage grid-connected PV system. The power quality is compromised by this voltage imbalance. One issue brought on by double-frequency oscillations, and grid-voltage imbalance is a harmonic disruption in the grid-injected current. This paper's objective is to design dual controllers to reduce harmonic distortion at the grid side by extracting maximum power output from the PV array via the Maximum Power Point Tracking (MPPT) algorithm. All of the modellings are done in the MATLAB/SIMULINK environment. The controllers used to reduce harmonic distortion and boost power quality are demonstrated by simulation results to be effective.