ARI and ARID control of virtual synchronous generator for frequency response improvement

Abstract

The modern power system is progressing from a centralised generation having synchronous generators to the distributed generation having the large-scale integration of renewable energy sources. These renewable energy sources are interfaced with the system through the inverter. Due to the inertia-less nature of inverter, the system becomes prone to frequency instability. The virtual synchronous generator control is used to enhance the frequency stability by introducing virtual inertia in the inverter control. The virtual synchronous generator technique provides flexibility to the researchers to regulate swing equation parameters in real-time. Based on this concept, this paper proposes an auto-regulated inertia control as the first contribution to improve the damping effect of virtual synchronous generator control. In the literature, the primary focus is on the inertia control and negligible importance is given to the damping factor control. Therefore, to show the effect of dynamic damping factor, together with dynamic virtual inertia, on the transient stability; an auto-regulated inertia and damping factor control of virtual synchronous generator is proposed as the second contribution. Simulation results of the proposed techniques are compared with the various virtual inertia control techniques in the real-time digital simulator environment. The results show that auto-regulated inertia and damping factor control is the most effective method to provide dynamic frequency support to the microgrid.