Optimized Control Approach for PMSM-Driven Solar Water Pumping with Improved Stability and Dynamic Response

This paper proposes an optimal power control method to overcome instability of conventional maximum power point tracking (MPPT) in solar water pumping (SWP) system. In SWP, the use of a pump load introduces an inoperable region due to the load coefficient, which can lead to significant power loss. Furthermore, conventional MPPT algorithms rely on fixed step of power variation. To overcome these issues, the proposed method directly regulates power to avoid instability, and unlike conventional MPPT, it dynamically adjusts power variations based on the voltage-current characteristics of the photovoltaic (PV) system. Experimental results validate that the proposed method outperforms existing techniques in terms of tracking performance and overall system stability.