Photovoltaic power system with integrated electric vehicle DC charger and enhanced grid support

Author

Traube, Joshua ; Fenglog Lu ; Maksimovic, Dragan

Author_Institution

Univ. of Colorado, Boulder, CO, USA

fYear

2012

fDate

4-6 Sept. 2012

Abstract

This paper describes a photovoltaic (PV) power system with integrated bidirectional electric vehicle (EV) DC charger. The system enables fast and efficient EV battery charging while providing enhanced grid support by limiting the ramp rate of the PV inverter output power. Charger operation is described in three distinct modes: charging only, charging with grid support, and grid support only. A prototype system consists of a 15 kW grid-tied PV system, a 10 kW, 98% efficient bidirectional DC charger, and a 10 kWh EV battery. Experimental results demonstrate the operating modes, start-up routine, battery state-of-charge (SOC) estimation, and system operation. Simulation results are presented for a worst-case scenario of highly fluctuating PV power output; the vehicle battery is charged in less than 90 minutes while simultaneously reducing the maximum ramp rate of the inverter output power by 30% and the average ramp rate by 93%.

Keywords

battery powered vehicles; invertors; photovoltaic power systems; power grids; secondary cells; EV battery charging; PV inverter; battery state-of-charge estimation; enhanced grid support; grid-tied PV system; integrated bidirectional electric vehicle DC charger; operating modes; photovoltaic power system; power 10 kW; power 15 kW; start-up routine; vehicle battery; Batteries; Inverters; Power generation; System-on-a-chip; Vehicles; Voltage control; energy storage; photovoltaic; vehicle-to-grid;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics and Motion Control Conference (EPE/PEMC), 2012 15th International

Conference_Location

Novi Sad

Print_ISBN

978-1-4673-1970-6

Electronic_ISBN

978-1-4673-1971-3

Type

conf

DOI

10.1109/EPEPEMC.2012.6397399

Filename

6397399