High Performance Stand Alone Solar PV System with High Gain, High Efficiency Front End DC-DC Converter and Bi-Directional Quadratic buck-boost DC-DC Converter for Low Input Voltage Solar PV Applications

Solar Photovoltaic (PV) has emerged as a major contender to serve as an alternative energy source and is currently playing a leading role in supporting the existing conventional power generation systems. Several solar PV systems require a high gain front end dc-dc converter. Conventional dc-dc converters can offer limited gain and their efficiency drops as the gain requirement increases. This paper proposes a novel 3-φ stand-alone solar PV system configuration that uses high gain, high efficiency dc-dc converters both in the forward power stages. Also Bidirectional dc-dc converter is a vital part of standalone solar Photo-Voltaic (PV) systems for interfacing the battery. The use of low voltage PV and battery sources are enabled by High voltage gain converters. Partial shading and parasitic capacitance effects on the PV source is also reduced. Reduction in battery life due to overcharging and deep discharging issues has been minimised by obviating series connection of a large number of battery modules. MPPT has been employed to extract maximum power from solar panel. For the stable and reliable system operation, Inverter output voltage is regulated by controlling the modulation index of sinusoidal pulse width modulation. By regulating the DC link voltage the active power demand is controlled. All the simulation results of this work are presented. The model is developed and applied in the MATLAB / Simulink environment, based on the mathematical and electrical models developed for the proposed system.