Distributed generation grid integration using virtual synchronous generator with adoptive virtual inertia

Virtual Synchronous Generator (VSG) is a control scheme applied to the inverter of a distributed generating unit in order to support power system stability by imitating the behavior of a synchronous machine. The VSG design of our research incorporates the swing equation of synchronous machine to express a virtual inertia property. Unlike a real synchronous machine, the parameters of the swing equation of VSG can be selected real-time to enhance the fast response of the virtual machine in tracking the steady-state frequency. Based on this concept, the VSG with adoptive moment of inertia and the negative moment of inertia idea is introduced newly. The idea is supported by simulation and experimental results which indicate remarkable performance in fast damping of frequency oscillations.