PMSG Based Standalone Distributed Generation Integrated Universal Active Filtering System

This work presents a strategy for enhancing power quality (PQ) in a standalone distributed generation system (DGS) supplying power to sensitive and nonlinear loads. This system integrates a permanent magnet synchronous generator (PMSG) driven by a hydropower turbine, a solar photovoltaic (PV) array, and a battery storage unit controlled through a universal active filtering system (UAFS). A modified generalized integrator (mGI) control is proposed to enhance PQ by efficiently compensating voltage deviations and suppressing harmonics. Simulation results show that this system reduces total harmonic distortion (THD) of source currents and load voltages to 2.6% and 1.1%, respectively, which are within the IEEE 519 standard limit, even though load current THD is 26.7%. Additionally, the system maintains a constant load voltage amplitude of 220 V despite generator-side fluctuations. During sudden unavailability of solar PV power, battery seamlessly discharges, ensuring uninterrupted operation. System’s performance is validated using a hardware prototype, demonstrating consistent PQ improvement under both steady-state and dynamic conditions. Proposed setup is suitable for standalone DGS applications requiring high-quality power delivery. Moreover, effectiveness of presented system is compared with other control techniques.