METHOD FOR OPERATING A CHARGING STATION

• US 20200130527A1
• Filed: 04/20/2018
• Published: 04/30/2020
• Est. Priority Date: 04/21/2017
• Status: Active Grant

• Current Assignee: Wobben Properties Gmbh (Aloys Wobben Stiftung)
• Original Assignee: Wobben Properties Gmbh (Aloys Wobben Stiftung)
• Inventors: BROMBACH, Johannes, STRAFIEL, Christian, PINGEL, Tobias
• Granted Patent: US 11,427,103 B2
• Time in Patent Office: Days
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/42 Voltage source inverters
• CPC Class Codes: B60L 53/52 Wind-driven generators
• CPC Class Codes: B60L 53/53 Batteries
• CPC Class Codes: B60L 53/54 Fuel cells
• CPC Class Codes: B60L 53/63 in response to network capacity
• CPC Class Codes: B60L 53/67 Controlling two or more charging stations
• CPC Class Codes: B60L 8/00 Electric propulsion with power supply from forces of nature, e.g. sun or wind
• CPC Class Codes: H02J 15/00 Systems for storing electric energy mechanical systems therefor F01-F04; in chemical form H01M
• CPC Class Codes: H02J 15/008 using hydrogen as energy vector
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy wind motors F03D
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• 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 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• 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 90/16 : Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y04S 30/12 : Remote or cooperative charging

Abstract

A method for operating a charging station for charging a plurality of electric vehicles, in particular electric cars, wherein the charging station is connected at a grid connection point to an electrical supply grid in order to be supplied with electrical energy from the electrical supply grid via said grid connection point, comprising the steps of drawing electrical energy from the electrical supply grid and charging one or more electric vehicles using the electrical energy drawn from the electrical supply grid, wherein the charging station is controlled in such a way that the electrical supply grid is electrically supported.

Claims

1. A method for comprising:

operating a charging station for charging a plurality of electric vehicles, wherein the charging station is coupled to an electrical supply grid at a grid connection point, wherein the charging station is configured to receive an electrical energy from the electrical supply grid via the grid connection point, wherein the operating comprises;

drawing electrical energy from the electrical supply grid, and

charging one or more electric vehicles using the electrical energy drawn from the electrical supply grid,

wherein the charging station is controlled in such a way that the electrical supply grid is electrically supported.

2. The method as claimed in claim 1,

wherein the drawing of the electrical energy is controlled in such a way that the electrical supply grid is electrically supported.

3. The method as claimed in claim 1,

wherein the drawing of the electrical energy is controlled depending on at least one of:

a grid state or a grid characteristic of the electrical supply grid.

4. The method as claimed in claim 3,

wherein the grid state indicates at least one state of the electrical supply grid selected from the list comprising:

a grid frequency,

a grid frequency change,

a grid voltage,

a grid voltage change, and

a harmonic content of the grid voltage,

wherein the grid characteristic indicates at least one characteristic of the electrical supply grid selected from the list comprising;

a grid sensitivity defined as a voltage response of the electrical supply grid at the grid connection point to a changed power removal of the charging station at the grid connection point, and

a short circuit current ratio defined as a ratio of a maximum short circuit current providable by the electrical supply grid at the grid connection point in relation to a nominal power removable by the charging station.

5. The method as claimed in claim 1, wherein the drawing of electrical energy is controlled depending on power values provided as reference values by one or more external signals.

6. The method as claimed in claim 1, wherein the drawing of the electrical energy is controlled in such a way that power is drawn from the supply grid depending on the grid frequency.

7. The method as claimed in claim 1 further comprising feeding reactive power from or into the supply grid depending on at least one of a grid state or a specification by a grid operator of the supply grid.

8. The method as claimed in claim 1, further comprising:

maintaining the charging station coupled to the supply grid in the event of a grid fault, and removing or feeding electrical power from or into the supply grid depending on at least one of;

a grid state or a specification by a grid operator,

wherein the charging station is controlled in such a way that the charging station draws as much power from the supply grid after the grid fault as the charging station drew immediately before the grid fault.

9. The method as claimed in claim 1, wherein the charging station is controlled in such a way that the charging stations feeds electrical power from an electric storage device of the charging station into the supply grid depending on at least one of:

a grid state or a specification by a grid operator.

10. The method as claimed in claim 1, wherein the charging station provides an instantaneous reserve depending on at least one of:

a grid frequency or a change in the grid frequency, wherein the charging station is configured to;

reduce power instantaneously removed from the supply grid, and

feed power from the electric storage device of the charging station into the supply grid.

11. The method as claimed in claim 10, further comprising:

drawing additional power from the supply grid depending on the grid frequency or the change in the grid frequency, wherein the charging station consumes the additional power from the supply grid,

wherein;

the charging station increases the power instantaneously removed from the supply grid to store more power in the electric storage device of the charging station, and increases the power to charge the one or more electric vehicles, and

consumes power in an additional consumer, in a chopper system which guides the electrical power in a targeted manner into a resistance arrangement comprising one or more electrical resistors that are configured to consume the power in a thermal manner.

12. The method as claimed in claim 1, wherein the drawing of electrical energy from the supply grid comprises removing electrical power from the supply grid, the method further comprising:

specifying at least one change limit to limit changes in the electrical power in terms of rate of change, such that at least one of;

a common gradient, an upper limit gradient, or a lower limit gradient are specified to limit a temporal increate or a temporal decrease in the power.

13. The method as claimed in claim 11, wherein the additionally or less required power is provided or taken by at least one measure from the list comprising:

use of the electric storage device of the charging station,

variation in the charging power of the electric vehicle to be charged in each case, and

control of further consumers of the charging station.

14. The method as claimed in claim 1, wherein one or more of the following are controlled using a virtual storage device:

the drawing of electrical energy from the supply grid,

the charging of the electric vehicles,

a control of further consumers of the charging station, and

a feed-in of electrical power into the supply grid,

wherein the virtual storage device takes account of;

an amount of power the charging station is able to provide for charging the electric vehicles and for feed-in to the supply grid, as charged storage capacity, and

an amount of power the charging station is able to take from the supply grid, as chargeable storage capacity.

15. The method as claimed in claim 1, wherein a maximum power to be removed from the supply grid is specifiable in a fixed or variable manner, wherein:

a fixed specification is performed by an external signal by a grid operator, and

a variable specification is performed depending on at least one of;

a grid characteristic or a grid state.

16. The method as claimed in claim 1, wherein at least one of:

at least one operational state of at least one windfarm coupled to the charging station or to the supply grid is taken into account, or

the at least one windfarm is at least partially controlled by the charging station or by an overall control unit superordinate to the charging station and to the at least one windfarm.

17. The method as claimed in claim 1, wherein the charging station and at least one windfarm configured to at least one of:

control a power flow in the supply grid, or

support a voltage regulation in the supply grid.

19. A charging station for charging electric vehicles, wherein the charging station is configured to perform the method as claimed in claim 1.

18. A charging station for charging electric vehicles, wherein the charging station is coupled at a grid connection point to an electrical supply grid in order to be supplied with electrical energy from the electrical supply grid via the grid connection point, the charging station comprising:

an active rectifier or bidirectional inverter configured to draw electrical energy from the electrical supply grid,

a plurality of charging terminals coupled to the active rectifier or the bidirectional inverter, each of the plurality of charging terminals being configured to charge an electric vehicle using the electrical energy drawn from the electrical supply grid, and

a central controller coupled to the plurality of charging terminals and configured to control the charging station, wherein the central controller is configured to control the charging station such that the electrical supply grid is electrically supported.

20. The charging station as claimed in claim 18, further comprising at least one electric storage device coupled to the active rectifier or bidirectional inverter and configured to temporarily store electrical energy therein, wherein the electrical energy is configured to:

to take more power from the supply grid than is instantaneously required to charge electric vehicles as required by the temporary storage,

use energy stored in the electric storage device as required to provide more power than is instantaneously removed from the supply grid in order to charge the electric vehicles, and

feed power into the supply grid.

21. The charging station as claimed in claim 18, comprising at least one consumer, wherein the consumer is configured to consume power in the event more power is removed from the supply grid than is instantaneously required to charge the electric vehicles,

wherein the central controller is configured to control the at least one consumer.

22. The charging station as claimed in claim 21, wherein the at least one consumer is selected from the list comprising:

a chopper system configured to guide electrical power in a targeted manner into a resistance arrangement comprising one or more electrical resistors in order to thereby consume additional power in a thermal manner,

a conversion device configured to convert electrical power into a gas, and

an electrolyzer.

23. The charging station as claimed in claim 18, wherein the charging station is coupled:

via a direct electric line for the exchange of electrical power via an intermediate DC voltage circuit, or

via the supply grid to a windfarm, and is prepared to coordinate the control of the charging station with a control of the windfarm.