Integration of Distributed Generation to Microgrid with Virtual Inertia
Vikash Gurugubelli, Arnab Ghosh, Shubhobrata Rudra
Abstract
The frequency is stable in the conventional power system due to kinetic energy stored in the Synchronous Generators (SGs), which can inject sufficient power into the power system network for maintaining the power balance in the system. However, the inertia in the SG inhibits abrupt deviations in frequency and maintains stability. Distributed Generators (DGs) are static and there is no rotating part to store the kinetic energy, and the moment of inertia of the grid is decreased and affects the system stability greatly. A control scheme is applied to the inverter such that the inverter acts like a Virtual Synchronous Generator (VSG). The design of the VSG incorporates the droop characteristics, swing equation, and damping properties of SG. The work proposed here covers the modeling of VSG and operating in both islanding and also grid-connected mode. The simulation results show the effectiveness of the proposed controller.