A New Approach for Reactive Power Control of Single Phase Transformerless Inverter to Modify Power Quality in Stand Alone Micro-Grids with Current Leakage Elimination

Nowadays there has been an increasing interest in transformerless inverter for grid-connected photovoltaic (PV) system due to low cost, high efficiency and light weight. One of the reasons describe the grid behavior is capability of reactive power control by inverter. According to the standard VDE-AR-N 4105, grid-tied PV inverter of power rating below 3.68KVA, should attain power factor (PF) from 0.95 leading to 0.95 lagging. Thus this paper present a new topology with ability to eliminate common mode leakage current and do power factor correction. The generation and extinction of this current is analyzed. It’s nice to say that non of open loop structure presented so far, can control the reactive power individualy without any controller. So here a new approach based on proportional – resonant controller with fast response is expressed. Simulations done with active load and RL load show the excellent performance of proposed algorithm. Then proposed inverter with 98 % efficiency is compared with H5, H6 and HERIC inverters.