Grid Connected Inverters influence on power quality of Smart Grid

The performance of the Grid Connected Inverters (GCIs) (like windmill and large central PV converters) is extremely important related to stable and safety operation of a "Smart Grid" SG. These inverters\´ control features not only cover the renewable energy conversion and active power feeding into the utility grid but furthermore they cover the helping of the grid voltage stabilization, supporting with reactive power of the grid in case of voltage dips. The GCIs support to meet the power quality standards by means of their fast acting of control abilities. Decentralized suppliers must contribute to the control of the grid by delivering active and reactive power. This paper gives an overview on the necessary features of GCIs, the inverter limitations and introduces some simulation results.