Grid Interfacing of Photovoltaic Generating System Through Cascaded Multi-Level Inverter in Distributed System

The power electronics has mainly momentous latest progress is power systems of photovoltaic be becoming extra with the increase in the energy demand in widespread and also reduces the environmental pollution around the world. Out of different structures of multi-level inverters, Cascaded H Bridge (CHB) inverter is more suitable converter for PV applications since each PV panel can act as a separate DC source for each cascade H bridge module. It has many inherent benefits likes: (1) Its modular structure,(2) it can be easily implemented through the series connection of identical H-bridges, (3) generate near sinusoidal voltages with only fundamental frequency switching and finally and (4) no electromagnetic interference or common mode voltages. This flexibility has resulted CHBMLI topology in various applications like medium-voltage industrial drives, electric vehicles and the grid connection of photovoltaic-cell generation systems. The main disadvantages of the cascade multilevel inverters is a need of an isolated dc voltage sources for each H-bridge, due to this reason size of the inverter and cost increases, by virtue of which reliability of the system reduces. This Disadvantage of inverter is the key motivation for the present work .In this paper Cascaded Multilevel inverter for grid inter facing of photovoltaic generating system is presented with reduced dc source to show the benefits of cascade the PV system. The performance of the cascaded multilevel inverter with fundamental switching scheme for different levels is studied through simulation using MATLAB. A Mathematical model for Photo Voltaic system is developed and implemented with the multilevel inverter.of the proposed system.