PV fed Synchronous Reluctance Motor Driven Water Pumping System with Grid Integration and Seamless Operability

Abstract

This paper deals with the control of a single-phase grid-connected solar photovoltaic (SPV) based synchronous reluctance motor (SynRM) driven water pumping system with seamless mode transition and power quality improvement capability. The presented system provides an uninterruptable power supply to the dedicated water pump and domestic loads even under grid absence by transferring control to the standalone mode. As a result, the smooth transition from grid-connected operation (GCO) to standalone operation (SAO) and vice versa provides higher system reliability. A second-order generalized integrator with frequency lock loop (SOGI-FLL) based control algorithm with SPV feedforward term is utilized for the voltage source converter (VSC) in GC operation. The net active component of load current is extracted by the SOGI-FLL current control. Furthermore, to reduce cost and complexity while increasing drive reliability, a sensorless flux estimation-based technique is used to estimate rotor position in order to develop SynRM control. The effectiveness of the presented control scheme for a single-phase PV grid synchronized water pumping system is demonstrated using the test results from the lab-based prototype.