Reactive power compensation of grid-connected inverter in vehicle-to-grid application to mitigate balanced grid voltage sag

Abstract

Modernized grid needs ancillary service as a variety of distributed energy resources are connected. Vehicle-to-grid (V2G) application is one of promising distributed energy resources, which enables to transfer bidirectional power between batteries of plug-in electric vehicle and the grid as well as offer ancillary service to the grid. Benefits of V2G application are voltage and frequency regulation, and spinning reserves. To achieve benefits of V2G application, grid-connected inverter (GCI) and its control method are significant. This paper presents control methods of GCI in V2G application to mitigate balanced voltage sag. Voltage sag detector and reactive power compensation are implemented. A 10 kW GCI with output LCL filter and closed-loop control is simulated for V2G application.