Solar Array-Energized, Battery-Interfaced Sensored PMBLDC Motor-Propelled Water Pump Utilizing an Enhanced Landsman DC-DC Converter

This paper deals with a solar-driven water pumping system employing a permanent magnet brushless direct current motor (PMBLDC), powered by a solar array generation system (SAGS) to address the challenges of grid unavailability in remote rural areas. To achieve less complex and smooth motor operation, a sensored six-step 120° conduction-based trapezoidal electronic commutation scheme is implemented using a three-phase, twolevel H-bridge voltage source inverter (VSI). Ensuring continuous and reliable pumping operation under varying climatic conditions, a Li-ion battery unit (LiBU) is integrated into the DC-bus, serving as an energy buffer support. For maximum power extraction from the SAGS, an enhanced Landsman DC-DC converter (ELDC) is deployed, controlled by an adaptively step-size adjustment (ASSA) based incremental conductance (INC) MPPT based switching control. This approach overcomes the steady-state error and misinterpretation of MPP caused by fixed step-size limitations, particularly during rapid irradiance fluctuations. The proposed system is modeled and simulated in MATLAB/Simulink (2018b version), and its performance is evaluated under two critical scenarios: rapidly varying solar irradiation and motor stalled operation. The results confirm stable DC-bus voltage regulation, demonstrating the robustness of the control strategy in ensuring consistent power delivery to the motor.