Enhancement of Power Quality and Power Flow Evaluation of a Photovoltaic Integrated UPQC System in a Distribution System

The rising awareness of green energy has boosted the use of distributed storage and renewables in networks and microgrids. As a result, the rising use of power electronic devices has significantly contributed to declining power quality (PQ) in distribution networks. The photovoltaic (PV) integrated unified power quality conditioner (UPQC) presented in this paper operating using a flexible compensatory strategy built on the adjustable leaky least mean square (ALLMS) algorithm. This soft-computing approach attains faster convergence by updating parameters iteratively within defined bounds. The ALLMS-based algorithm generates UPQC control signals without needing low-pass filters to clean distorted voltages and currents. It corrects point of common coupling (PCC) current harmonics and low power factor, while maintaining network and PV power balance via the shunt VSC’s feed-forward compensation. It also regulates the DC-link voltage, while the series converter maintains a pure sinusoidal load voltage despite grid sags, swells, or harmonics.