WL-QHTGM-Based Adaptive Control of Grid-Connected PV System for Solar Water Pumping with PMSM Drive

This paper presents an efficient solar water pumping system(SWP) that is driven by a permanent magnet synchronous motor (PMSM) drive with a grid-connected photovoltaic (PV) system. This system utilizes a voltage source converter (VSC) regulated by widely linear Quaternion Hyperbolic Tangent German-McClure (WL-QHTGM) algorithm to maintain stable power exchange among PV source, grid, and connected non-linear loads incorporated at point of shared coupling. PMSM drive is connected to DC link with an intermediate voltage source inverter (VSI). MATLAB/Simulink is used to model and simulate this system at three critical operating conditions: variations in solar irradiation, unbalanced load conditions, and changes in PMSM reference speed. PMSM successfully maintains desired speed and torque in all scenarios, ensuring continuous and efficient water pumping. Furthermore, nonlinear load is fed stably, and WLQHTGM algorithm effectively regulates power flow, maintaining smooth interaction among PV source, grid and connected loads. Results validate system capacity to maintain consistent performance across a range of operational scenarios, highlighting effectiveness of WL-QHTGM algorithm for VSC control and robustness of vector control for PMSM speed regulation.