Reduce Leakage Currents in Transformer less PVSystem Connected to Utility Grid with H-Bridge Inverter Topology

Renewable energy is becoming a necessity as alternative forms of energy generation are needed to meet the world's energy demands. In this report, the three main current PV system configurations will be discussed and compared in terms of cost, reliability and performance. There are different topologies introduced in grid connected pv system with transformer and transformer less. There exist transformer between pv array and grid in previously so there exist galvanic isolation. The main problem with using transformer resonance due to thus transformer and harmonics injected in grid because of these DC spillage current infused into the network may cause saturation of core in transformer at distribution side and it cause overheating and failure. Stray capacitance in between pv array and ground the spillage current flow through this. Different inverter topologies reduce leakage currents that are half-bridge and full- bridge topologies, with bipolar pulse width modulation have been proposed. In this project proposed high- efficient topology these generate no common varying mode voltage and require low input voltage as bipolar pwm full bridge. In these bipolar pwm with using LCL filter topology is used to reduce leakage currents between PV array and grid. In these DC-AC inverter displayed with H-Bridge protected Gate Bipolar Semiconductor module which is controlled utilizing bipolar PWM strategy. There using the MPPT Technique of perturb and observe to absorb maximum amount of power from PV system. In these PLL is utilize to keep up synchronize the voltage, current, frequency in phase with the grid. These current and voltage regulators are used to analyze the reference voltage is acquired from the inverter active current and reactive current is zero.By using PI and FUZZY current controller to reduce total harmonic distortion with using fuzzy current controller is better than PI to improve power quality.