VEHICLE-TO-GRID SYSTEM WITH POWER LOSS COMPENSATION

• US 20150255985A1
• Filed: 03/05/2014
• Published: 09/10/2015
• Est. Priority Date: 03/05/2014
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan North America Incorporated (Nissan Motor Co., Ltd.)
• Inventors: Higashi, Kazuyuki
• Granted Patent: US 9,630,511 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60L 53/67 Controlling two or more charging stations
• CPC Class Codes: H02J 3/322 the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
• CPC Class Codes: H02J 3/46 Controlling of the sharing of output between the generators, converters, or transformers
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y04S 10/126 the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]
• CPC Class Codes: Y04S 10/14 Energy storage units

Abstract

A vehicle-to-grid system connected to a power grid includes a first vehicle group of one or more vehicles connected to the power grid, a second vehicle group of one or more vehicles connected to the power grid, and a vehicle-to-grid controller. The vehicle-to-grid controller causes each vehicle from the second vehicle group to supply electrical power to the power grid at a nominal frequency and at an adjusted amplitude, and causes each vehicle from the first vehicle group to supply electrical power to the power grid at an adjusted frequency that is different than the nominal frequency and at a nominal amplitude that is different than the adjusted amplitude.

Claims

1. A vehicle-to-grid system connected to a power grid, comprising:

a first vehicle group of one or more vehicles connected to the power grid;

a second vehicle group of one or more vehicles connected to the power grid; and

a vehicle-to-grid controller that causes each vehicle from the second vehicle group to supply electrical power to the power grid at a nominal frequency and at an adjusted amplitude, and causes each vehicle from the first vehicle group to supply electrical power to the power grid at an adjusted frequency that is different than the nominal frequency and at a nominal amplitude that is different than the adjusted amplitude.

2. The vehicle-to-grid system of claim 1, wherein the electrical power supplied by the first vehicle group, when combined with the electrical power supplied by the second vehicle group, defines combined electrical power having the nominal frequency.

3. The vehicle to grid system of claim 1, wherein the nominal frequency is a multiple of the adjusted frequency.

4. The vehicle-to-grid system of claim 1, wherein the adjusted frequency is lower than the nominal frequency.

5. The vehicle-to-grid system of claim 1, wherein each vehicle from the first vehicle group supplies electrical power to the power grid using a low frequency waveform, each vehicle from the second vehicle group supplies electrical power to the power grid using a nominal frequency waveform, and a single half-cycle of the low frequency waveform corresponds to one or more full cycles of the nominal frequency waveform.

6. The vehicle-to-grid system of claim 5, wherein the low frequency waveform has a positive half-cycle and a negative half-cycle, the nominal frequency waveform has a reduced minimum power value relative to the low frequency waveform during the positive half-cycle of the low frequency waveform, and the nominal frequency waveform has an increased maximum power value relative to the low frequency waveform during the negative half-cycle of the low frequency waveform.

7. The vehicle-to-grid system of claim 1, wherein each vehicle from the first vehicle group has a respective first transmission distance with respect to the power grid, each vehicle from the second vehicle group has a respective second transmission distance with respect to the power grid, and the respective first transmission distance is greater than the respective second transmission distance.

8. The vehicle-to-grid system of claim 1, wherein each vehicle from the first vehicle group and each vehicle from the second vehicle group includes an on-board charging system that receives commands from the vehicle-to-grid controller.

9. The vehicle-to-grid system of claim 8, wherein the on-board charging system of each vehicle from the first vehicle group and each vehicle from the second vehicle group receives the commands from the vehicle-to-grid controller via at least one of a wired communications link or a wireless communications link.

10. The vehicle to grid system of claim 1, wherein each vehicle from the first vehicle group and each vehicle from the second vehicle group is connected to a respective off-board vehicle charging station that receives commands from the vehicle-to-grid controller.

11. The vehicle-to-grid system of claim 10, wherein the respective off-board vehicle charging station for each vehicle from the first vehicle group and each vehicle from the second vehicle group receives the commands from the vehicle-to-grid controller via at least one of a wired communications link or a wireless communications link.

12. A method for coordinating supply of electrical power to a power grid, comprising:

transmitting a first command to each vehicle from a first vehicle group that, when processed, causes each vehicle from the first vehicle group to supply electrical power to the power grid at a nominal frequency and at an adjusted amplitude; and

transmitting a second command to each vehicle from a second vehicle group that, when processed, causes each vehicle from the second group to supply electrical power to the power grid at an adjusted frequency that is different than the nominal frequency and at a nominal amplitude that is different than the adjusted amplitude.

13. The method of claim 12, further comprising:

determining a transmission distance for each of a plurality of vehicles; and

assigning each vehicle from the plurality of vehicles to one of the first vehicle group or the second vehicle group based on the respective transmission distance for each vehicle.

14. The method of claim 12, wherein the electrical power supplied by the first vehicle group, when combined with the electrical power supplied by the second vehicle group, defines combined electrical power having the nominal frequency.

15. The method of claim 12, wherein the nominal frequency is a multiple of the adjusted frequency.

16. The method of claim 12, wherein the adjusted frequency is lower than the nominal frequency.

17. A system for coordinating supply of electrical power from a first vehicle group of one or more vehicles that are connected to a power grid and a second vehicle group of one or more vehicles that are connected to the power grid, the system comprising:

a vehicle-to-grid controller that is operable to;

determine a transmission distance for each of a plurality of vehicles,

assign each vehicle from the plurality of vehicles to one of the first vehicle group or the second vehicle group based on the respective transmission distance for each vehicle,

transmit a first command to each vehicle from the first vehicle group that, when processed, causes each vehicle from the first vehicle group to supply electrical power to the power grid at a nominal frequency and at an adjusted amplitude, and

transmit a second command to each vehicle from the second vehicle group that, when processed, causes each vehicle from the second group to supply electrical power to the power grid at an adjusted frequency that is different than the nominal frequency and at a nominal amplitude that is different than the adjusted amplitude.

18. The system of claim 17, wherein the electrical power supplied by the first vehicle group, when combined with the electrical power supplied by the second vehicle group, defines combined electrical power having the nominal frequency.

19. The vehicle to grid system of claim 17, wherein the nominal frequency is a multiple of the adjusted frequency.

20. The vehicle-to-grid system of claim 17, wherein the adjusted frequency is lower than the nominal frequency.