Enhancing Power Quality of PV Grid-connected System Through Mantis Shrimp Optimization Algorithm for Optimal DC Bus Voltage Control

The nonlinear and intermittent nature of Photovoltaic (PV) systems introduces dynamic disturbances that negatively impact the stability of the DC bus voltage (Vdc) between PV sources and shunt active power filters (SAPFs). These fluctuations pose significant challenges to the performance of SAPFs, especially when the reference DC bus voltage (Vdc*) is constant and not adapted to the instantaneous operating conditions. In this study, a Perturb and Observe (P&O) algorithm is employed within the PV subsystem to perform Maximum Power Point Tracking (MPPT), further contributing to the time-varying behavior of Vdc. To address this problem, this paper proposes a real-time optimization strategy based on the Mantis Shrimp Optimization Algorithm (MShOA) for continuous Vdc* adjustment. This method relies on real-time Total Harmonic Distortion (THD) feedback to dynamically determine the optimal Vdc*, thereby improving harmonic mitigation and maintaining voltage stability. The effectiveness of the proposed method in accurately determining the optimal reference DC bus voltage (Vdc) has been thoroughly verified through simulation results. Comparative analysis with conventional theoretical methods confirms the superior performance of the MShOA-based strategy in enhancing power quality and reducing THD in dynamic operating environments.