KY Based DC-DC Converter for Standalone Photovoltaic Water Pumping System Employing Four Switch BLDC Drive

Abstract

Solar based water pumping system is getting a broad consideration, since solar energy is found to be the best solution for the existing conventional energy resources. Moreover solar PV (Photovoltaic) fed water pumping is favored technique within the remote regions for different applications. In this paper KY based DC-DC converter fed water pumping system with BLDC (Brushless DC motor) is proposed. Voltage ripple reduction is one of the main advantages of KY converter with a high transient response. For tracking the maximum power under various irradiation conditions P&O Perturb and Observe) based MPPT (Maximum Power Point Technique) technique is employed by varying the duty ratio of KY converter. Instead of six switch VSI (Voltage Source Inverter), four switch VSI is employed, where cost saving is accomplished by decreasing the number of inverter power switches. A BLDC motor is connected to drive the centrifugal pump, since it has advantageous feature while connecting to that of PV generator.