Oscillation Damping Reduction Methodology for Distributed Generator Using VSG

The Distributed generators are connected to grid by power inverters. These includes photovoltaic, wind turbine and gas cogeneration system have attracted more attention than in the past. The power inverters used in DG's are generally controlled by a phase -locked loop (PLL) in order to synchronize with the grid. The capacity of inverters is increased day by day. That will be affected the stability of the power system. So, this new concept of virtual synchronous generator which is used to control inverters to behave likes a real synchronous generator. The VSG can produce virtual inertia from energy storage during a short operation time, and the active power can be produced by a VSG similar to a synchronous generator. In this paper, using the VSG the oscillation should be damp for DG. The method is confirmed analytically and verified through computer simulations.