Abstract

This paper presents a solar water pumping system with captive energy storage using a synchronous reluctance motor (SYRM). An intermediate boost converter, commonly used to track the peak power of solar photovoltaic array, is eliminated in this system. A voltage source converter is used to drive a SYRM pump drive. A sensorless vector control algorithm is implemented in real-time incorporating the impact of saturation in the motor for control of SYRM. This system provides a cost-effective and reliable solution for an uninterruptable and rated water discharge. The solar water pumping system is used as a power source to achieve full capacity of water delivery regardless of climatic conditions. The solar PV array acts as a primary energy source, whereas the battery storage is used as a backup source. Therefore, the battery storage is discharged only under severe climatic conditions or whenever the solar photovoltaic array is deficient in feeding the water pump. Additionally, it is charged by the solar photovoltaic array whenever the pump operation is suspended or operating at a lower rating. A bidirectional DC converter regulates the charging and discharging control of the battery energy storage by controlling the DC bus voltage. The performance of a SYRM based solar water pumping system with rotor position and speed estimation at varying climate conditions, is tested on a laboratory prototype.

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