Experimental Validation of the VSG in a Local Autonomous Power-Electronics-Based Microgrid

Abstract

Parallel operation of voltage source inverters (VSIs) is a considerable topic for the autonomous power-electronics- based microgrids (APEBMGs). In this paper, the modeling, stability analysis, and experimental evaluation of parallel-tied three phase VSIs based on the virtual synchronous generator (VSG) control strategy are investigated. The proposed VSG method usually comprises the active and reactive power calculations, the mathematical model of the VSG, the virtual impedance loop, as well as the inner voltage and current control dual loops. By using the proposed power calculations utilizing the delayed-signal cancellation with multiple notch filters (DSC- MNFs) for filtering noises, the VSG model, and the virtual impedance design based on the dc component elimination with a cascaded general integrator (DCE-CGI) scheme, an accurate and fast power sharing is achieved. Experimental results of a local APEBMG are used to illustrate the effectiveness and performance of the parallel-tied VSI system.