Enhancing Power Quality in Grid- Connected PV Systems Using New Integral Backstepping Control Validated via PIL Co-Simulation

In the context of the growing global demand for clean and sustainable energy, advanced control strategies for renewable energy systems play a crucial role in improving efficiency, reliability, and grid integration. This paper addresses these challenges by proposing a novel nonlinear integral backstepping control (NIBC) approach for a grid-connected photovoltaic (PV) system with dual functionality. The proposed control scheme is designed to regulate the maximum power point (MPP), current, and DC-link voltage loops, ensuring a stable DC bus voltage while enabling continuous and optimal energy extraction from the PV array. By incorporating power exchange rules with the utility grid into the energy management strategy, effective DC bus voltage regulation is achieved under varying operating conditions. The proposed approach enhances grid power quality by maintaining low harmonic distortion, fast dynamic response, high power factor, and strong robustness, even in the presence of nonlinear loads. Furthermore, the system’s performance is evaluated under fluctuating solar irradiation to demonstrate the effectiveness and resilience of the control strategy. To validate its practical feasibility, a Processor-in-the-Loop (PIL) co-simulation using a C2000 LaunchXL-F28379D digital signal processing (DSP) platform is conducted, highlighting the potential of the proposed method to support the reliable and efficient integration of renewable energy sources into modern power grids.