Design and Implementation of New Oscillating Power Compensator With Improved Control Method Applied to Single-Phase Solar Inverter

Abstract

Single-phase power systems inherently exhibit second-harmonic power oscillations, which can degrade photovoltaic (PV) system performance by reducing efficiency, shortening panel lifespan, and increasing AC current harmonic distortion. Conventional compensation techniques often rely on the main inverter topology, require additional passive components, or involve complex control strategies with limited robustness. This paper proposes a fully independent parallel compensator, implemented as a voltage-controlled current source, to effectively suppress PV current ripple. A hybrid control strategy is introduced, combining a proportional-resonant (PR) controller for steady-state error elimination with a Dead-Beat (DB) controller to ensure fast dynamic response. Additionally, a robust LMI-based PR controller is designed to enhance system performance under varying operating conditions. Simulation results demonstrate that the proposed system reduces current ripple from 10 to 0.5 A, offering a simple, efficient, and inverter-independent solution for PV ripple compensation.