An indirect matrix converter-based unified power quality conditioner for a PV inverter with enhanced power quality functionality

This paper introduces an Indirect Matrix Converter (IMC)-based Unified Power Quality Conditioner topology for a Photovoltaic (PV) system and sensitive load, with enhanced Power Quality functionalities. In particular, the proposed system is able to compensate grid voltage sags, swells and harmonics in the sensitive load, and non-linear load current harmonics in the Low-Voltage (LV) grid, in addition to the common PV inverter functionalities. The modulation of the shunt converter is developed specifically to control the PV array current and the grid currents amplitude, as opposed to the common IMC modulation methods. The IMC modulation is synchronized with the series inverter modulation in order for the system to operate as a whole. Simulation results are presented to confirm the proper operation of the system under a variety of operating conditions.