Charging station for electric vehicles with network stabilization

• US 8,779,720 B2
• Filed: 01/31/2012
• Issued: 07/15/2014
• Est. Priority Date: 08/10/2009
• Status: Active Grant

• Current Assignee: innogy SE (E.ON SE)
• Original Assignee: RWE AG
• Inventors: Gaul, Armin, Diefenbach, Ingo
• Primary Examiner(s): Tso, Edward
• Assistant Examiner(s): PIGGUSH, AARON C
• Application Number:
  US13/362,518
• Publication Number:
  US 20120161704A1
• Time in Patent Office: 896 Days
• Field of Search: 320/104, 320/107, 320/109, 320/134, 320/155
• US Class Current: 320/109
• CPC Class Codes: B60L 53/63 in response to network capacity
• CPC Class Codes: B60L 55/00 Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 3/241 The oscillation concerning frequency
• 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]

Abstract

Charging station for electric vehicles. A network stabilization is achieved by a network frequency measuring device 8 being arranged to acquire a network frequency and to detect a network frequency which deviates from a reference frequency, and a load regulating device 10 being in operational connection with the network frequency device 8 such that, upon a deviation from the reference frequency being detected in the network frequency, the load regulating device 10 regulates the electrical power emitted to an electric vehicle by the charging station 2.

Claims

1. Charging station for electric vehicles, comprising:

a network frequency measuring device, arranged to acquire a network frequency and to detect a deviation in the network frequency from a reference frequency;

a load regulating device in operational connection with the network frequency measuring device such that, upon a deviation from the reference frequency being detected in the network frequency, the load regulating device regulates the electrical power emitted to an electric vehicle by the charging station;

wherein the load regulating device communicates a reduced charging power to the electric vehicle to reduce the electrical power emitted; and

wherein the load regulating device reduces the electrical power emitted by the charging station along a reduction characteristic curve, depending on at least one of the deviation amount detected by the network frequency measuring device, the duration of the deviation, and/or the frequency gradient.

2. Charging station of claim 1, wherein, upon a drop in the network frequency below the reference frequency, the load regulating device reduces the electrical power emitted to the electric vehicle by the charging station.

3. Charging station of claim 2, wherein, to reduce the electrical power emitted, the load regulating device imposes a limit on charging current.

4. Charging station of claim 1, wherein the reduction characteristic curve is depending on at least one of the deviation amount detected by the network frequency measuring device, the duration of the deviation, and/or the frequency gradient.

5. Charging station of claim 1, wherein, upon an increase being detected in the network frequency, the load regulating device increases the electrical power emitted to an electric vehicle by the charging station.

6. Method for operating a charging station for electric vehicles, comprising:

acquisition of a network frequency;

detection of a deviation in the network frequency from a reference frequency;

regulation of electrical power emitted to an electric vehicle by the charging station upon a deviation from the reference frequency being detected in the network frequency;

wherein a load regulating device communicates a reduced charging power to the electric vehicle to reduce the electrical power emitted;

wherein the load regulating device reduces the electrical power emitted by the charging station along a reduction characteristic curve, depending on at least one of the deviation amount detected by a network frequency measuring device, the duration of the deviation, and/or the frequency gradient.

7. Method of claim 6, wherein the regulation of the electrical power emitted to the electric vehicle by the charging station is a reduction or increase.

8. Method of claim 6, wherein, upon a reduction in the charging power being communicated, the electric vehicle reduces a charging current.

9. Method of claim 6, wherein the reduction characteristic curve is determined as a function of at least one of the acquired deviation amount, the duration of the deviation, and/or the frequency gradient.