In this book shows a novel control approach of a three phase grid connected wind energy conversion system, incorporating a maximum power point tracker for dynamic active power generation jointly with reactive power compensation of distribution utility systems has been presented. Thus the five level multilevel inverter topology were chosen based on what has gone before, even if that topology may not be the best choice for the application. Several multilevel voltage source inverters and their modulation topologies are introduced. The cascaded-inverter with separated dc sources is discussed in detail with results to verify the proposed concepts. The improved capabilities of the grid-connected WECS to rapidly exchange active power with the electric system, simultaneously and independently of the reactive power exchange, permit to greatly enhance the operation and control of the electric system.