A Novel Vector Control Scheme for PMSM Driven Encoder-Less Solar Water Pumping System

This work presents a solar photovoltaic (PV) array fed permanent magnet synchronous motor (PMSM) driven single stage solar water pumping (SWP) system. A novel vector control scheme with reduced computational burden due to elimination of speed controller, is proposed here for speed control of PMSM. An adaptive step size perturb and observe maximum power point tracking technique is used to accelerate the response of the system. The back-electro-motive force based technique is used for encoder-less estimation of rotor position. This improves the reliability and reduces the cost of the SWP system. A single stage topology is utilized for reducing the losses and cost associated with intermediate stage DC-DC converter. The applicability of the overall system is validated through a developed laboratory prototype using digital signal processor (DS-1202). Performance of the system has been found to be quite satisfactory under both dynamic and steady state conditions.