Method for operating a charging station

Patent metadata

Field	Value
Publication number	US-2020130527-A1
Application number	US-201816606198-A
Country	US
Kind code	A1
Filing date	Apr 20, 2018
Priority date	Apr 21, 2017
Publication date	Apr 30, 2020
Grant date	—

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.

First claim

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.

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 cent

Assignees

• Wobben Properties Gmbh

Inventors

• Brombach Johannes
• Strafiel Christian
• Pingel Tobias

Classifications

• B60L53/52

  Wind-driven generators · CPC title

• B60L2210/42

  Voltage source inverters · CPC title

• B60L53/54

  Fuel cells · CPC title

• B60L53/67

  Controlling two or more charging stations · CPC title

• H02J7/34

  Parallel operation in networks using both storage and other DC sources, e.g. providing buffering (H02J7/14 takes precedence) · CPC title