A Resilient Multi-Resonant Controller for Standalone and Grid-Connected PV System

Despite the fast integration of photovoltaic (PV) plants into the power grid, advanced current controllers must be implemented in grid-tied power converters to effectively inject high-quality current that is synced with grid voltage. This study describes the modeling and design of a digital multi-resonant controller that provides high-quality current. The innovation comes from developing control more effectively than standard ways. As a result, practical engineers discover a simple, fast, reliable, and precise control mechanism. The proposed 5-kVA photovoltaic system can efficiently inject active and reactive power while being robust to imbalance conditions. Synchronization is accomplished by the use of a phase-locked loop (PLL) with a synchronous reference frame (SRF), which performs well even when the grid is deformed or nonideal. The built controller's functionality and efficacy are evaluated using simulations with PSIM and Code Composer Studio, as well as Hardware in Loop (HIL) experiments with Typhoon 402 and TMS32F28335. The designed controller is tested in both grid-connected and independent variants under a wide range of disturbances, distortions, and non-ideal conditions. The simulation and HIL results corroborate the suggested controller's durability, speed, robustness, and efficacy when compared to a finely tuned classic proportional resonant (PR) controller.