Small-Signal Stability Analysis of PV-Based Synchronverter Including PV Operating Modes and DC-Link Voltage Controller

Abstract

Virtual Synchronous Generator (VSG) is one of the promising solutions today for integration of renewable energy sources to the grid. The PV power generation is dominating most of the generation in renewable energy. In this scenario, it is imperative to study the combined dynamics of PV source and VSG in grid connection mode. This paper presents a study of such a PV power system which is connected to a grid. The dc-link capacitor is considered as energy storage (ES) element which is generally the case in most of the practical systems. The synchronverter control scheme is taken as a VSG model. The small-signal model is obtained for the system under study which mainly includes PV source and dc-link voltage controller dynamics. From the eigenvalues which are obtained by using the small-signal model, analysis is carried out to find the effect on system dynamics due to the variation in different system parameters. Further, effect of maximum power point (MPP) and non-MPP mode on system dynamics is studied. The proposed model is validated through simulation in PSCAD/EMTDC and Controller Hardware in Loop (CHIL) simulation in Real Time Digital Simulator (RTDS). IEEE