This Paper presents the mit igation of power quality problems using Grid Connected  with PQ vector control algorithm based decoupled current controller algorithm is presented for compensation of loads in a distribution system. The Power Quality Analysis impacts of grid-connected photovoltaic power plant on the harmonic current in the power qual ity aspect of distribution network, Summaries the requirement of harmonic current inject ing in grid caused by photovoltaic power plant which connected in user si de. The grid-connected photovoltaic generation and then analyzes it by build models of photovoltaic generation and power grid.