Electric Power System Stabilization by Virtual Inertia and Fast Grid Frequency Support of Grid-Following Virtual Synchronous Generator

Abstract

The Virtual Synchronous Generator (VSG) can give virtual inertia and imitate primary control of the synchronous generator. This paper focuses on grid-following (GFL) type VSG for easy parallel operation compared to voltage source inverter. The grid frequency support of GFL-VSG can be achieved by controlling active power output using frequency deviation. However, this control causes the delay because of feedback for the virtual inertia. This paper proposes the GFL-VSG with the parallel installation of the governor and swing equation to reduce the delay. The numerical simulation was carried out to verify its effect and grid frequency support of the proposed GFL-VSG. The result shows that grid frequency support by GFL-VSG is faster compared with the conventional method, and the gate frequency is more stable with multiple several VSGs.