SPV array fed SRM driven water pumping system utilizing dual output SEPIC converter

In this paper, the topology of a single switch, single input and dual output SEPIC (Single Ended Primary Inductance Converter) is utilized for proposed SPV (Solar Photovoltaic) based water pumping system employing SRM (Switched Reluctance Motor). The proposed DC-DC converter has advantages of conventional SEPIC including capability to provide the efficient voltage balancing of DC link capacitors of a mid-point converter of SRM. Therefore, it eliminates the need of extra efforts to balance the DC link voltage across DC link capacitors and makes the proposed water pumping system cost effective and simple. A unique approach of variable DC link operation of SRM drive with an electronic commutation for switches of a mid-point converter is used with the elimination of current sensors at motor side which results in reduction in cost and losses of the system. The characteristic of providing dual output voltages with no polarity reversal and having features like minimal active components and low noise operation makes proposed dual output SEPIC suitable for solar water pumping using SRM drive. For increasing the efficiency of pumping system, an incremental conductance (InC) based MPPT technique is used to feed a SRM drive.