Photovoltaic supplied grid-tie three-phase inverter with active power injection and reactive harmonic current compensation capability

There has been increased attention in the industry to solve consumer related power quality problems using photovoltaic based grid-tie inverters. The main idea here is to integrate active power filter features on the control algorithm of conventional on-grid photo-voltaic (PV) inverters. However, such products have not yet matured broadly in the market and calls for more research. In this study, we show a simple and effective method to suppress grid current harmonics during pushing the harvested power from PVs to the grid. The proposed grid-tie inverter can also support reactive power requirement on the load side. Moreover, the performance of the proposed control strategy is compared with the conventional grid-tie PV inverter. The proposed system is modelled using MATLAB/Simulink and also tested in real-time environment. Results are then presented as a verification of the studied system.