A bidirectional battery charger for electric vehicles with V2G and V2H capability and active and reactive power control

A bidirectional battery charger using a three-phase voltage source inverter (VSI) is presented to be employed in plug-in electric vehicle applications enabling Vehicle-to-Grid (V2G) and Vehicle-to-Home (V2H) functionality with simultaneous active and reactive power control. The charger is controlled by a grid supervising unit with voltage droop control, providing it with P (active) and Q (reactive) power requests, and is responsible of reporting back its available power reserves (apparent power). In V2G mode the grid voltage is observed and a current controller on the d-q coordinate system together with the three phase inverter can transfer energy in both directions. Also reactive power compensation, inductive or capacitive, is possible. Asymmetries on the grid load can also be compensated by slight modifications of the control regime. Further, in V2H mode, the charger system can be seen as the master grid-forming generator responsible to provide a stable voltage at the network frequency. A proper synchronization strategy is presented as well, to guarantee smooth reconnection with the power grid. The proposed architecture is modeled in Simulink and aims the realization in existing electric vehicle and smart grid prototypes of the Siemens AG.

[1]  Hui Zhang,et al.  Three-phase grid-connected photovoltaic system with SVPWM current controller , 2009, 2009 IEEE 6th International Power Electronics and Motion Control Conference.

[2]  Leon M. Tolbert,et al.  Effects of V2G reactive power compensation on the component selection in an EV or PHEV bidirectional charger , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[3]  Leon M. Tolbert,et al.  Examination of a PHEV bidirectional charger system for V2G reactive power compensation , 2010, 2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[4]  J. G. Pinto,et al.  Assessment of a battery charger for Electric Vehicles with reactive power control , 2012, IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society.

[5]  E. Ortjohann,et al.  Grid-Forming Three-Phase Inverters for Unbalanced Loads in Hybrid Power Systems , 2006, 2006 IEEE 4th World Conference on Photovoltaic Energy Conference.

[6]  Subhashish Bhattacharya,et al.  Multi-function bi-directional battery charger for plug-in hybrid electric vehicle application , 2009, 2009 IEEE Energy Conversion Congress and Exposition.

[7]  Mithat Can Kisacikoglu,et al.  Vehicle-to-grid (V2G) Reactive Power Operation Analysis of the EV/PHEV Bidirectional Batt ery Charger , 2013 .

[8]  Paul C. Krause,et al.  Analysis of electric machinery , 1987 .

[9]  L. Chang,et al.  SVPWM-based current controller with grid harmonic compensation for three-phase grid-connected VSI , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).