Certain investigations on high gain DC DC converters using programmable n level step generator for solar PV systems

Abstract

newline A photovoltaic array has been used to generate electrical energy from solar energy. Despite the abundance of solar energy, the total electricity from Photovoltaic (PV) sources is negligible. The main hindrance to the penetration and reach of solar PV systems is their low efficiency and high capital cost. Since the role of PV arrays is to deliver power, one of the key factors in achieving maximum power output from an array is tracking and holding its Maximum Power Point. Maximum power point varies with temperature, incident solar radiation, and loading conditions. Hence, it must be continuously monitored to react with rapid changes Recent developments in power electronics and power semiconductor devices have improved the power conversion techniques related to renewable energy conversion. DC to DC converters find their way for interconnecting photovoltaic array with load. The switched-mode DC to DC converters possess some of the simplest power electronic circuits that convert one level of electrical voltage into another level through switching action. These converters have been widely used in industry as well as in research.The proposed converter topologies are analyzed mathematically, and their characteristic advantages are highlighted. Presently, fractional order controllers are established for extensive applications in the area of managing DC to DC converter. To manage the output voltage of high gain converter, a Fractional Order Proportional Integral Derivative (FOPID) controller has been employed. Two numbers of linear feedback FOPID controllers, which are capable of regulating both current and voltage in the device, have been employed.When the PV array is connected with load using DC to DC converter, the system may not extract the maximum power from the PV array, as the operating point of the system does not match with the maximum power point of PV characteristics.