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NOVEL VOLTAGE STABILITY ANALYSIS OF A GRID CONNECTED �?? PHOTOVOLTIC SYSTEM

C.Gnanavel K. Vanchinathan

In the recent decades to meet the future energy demands and to give quality and pollution free supply to the growing environment conscious population, the present world attention is to go in for natural energy sources. The problem will be compounded due to fast depletion of fossil fuel deposits, quality of fuels and above all the environmental degradation caused by the use of conventional energy sources. The alternatives to the conventional energy sources are environment friendly and pollution free renewable energy sources. A conventional grid connected photo voltaic system with a battery energy storage system uses a maximum power point tracker for extracting maximum solar power. The dc/ac inverter translates the input dc voltage into an ac voltage. Thus the system structure and control becomes complicated. The proposed method is a grid connected photovoltaic system with a simpler structure that provides the function of a parallel power factor corrector. The maximum power point tracker serves as a charger too, tracking the maximum solar power controlled by fuzzy logic controller. The dc/ac inverter is capable of bidirectional power transfer. When either the solar power or the stored energy of the batteries is sufficient, the inverter provides all or a part of the load power. Solar electricity is not produced at night and is much reduced in cloudy conditions. Thus a storage or complementary power system is required. Solar power is pollution-free, production end-wastes and emissions are manageable using existing pollution controls. PV installations can operate for many years with little maintenance or intervention after their initial set-up and their operating costs are low when compared to existing power technologies.