Method and apparatus for transmitting electrical power

• US 9,876,353 B2
• Filed: 09/09/2013
• Issued: 01/23/2018
• Est. Priority Date: 10/17/2012
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Eckert, Bernd, Krauter, Gisbert, Faye, Ian
• Primary Examiner(s): Jager, Ryan
• Application Number:
  US14/436,507
• Publication Number:
  US 20160172853A1
• Time in Patent Office: 1,597 Days
• Field of Search: 307 52
• CPC Class Codes: B60L 53/14 Conductive energy transfer
• CPC Class Codes: B60L 53/51 Photovoltaic means
• CPC Class Codes: B60L 53/52 Wind-driven generators
• CPC Class Codes: B60L 53/63 in response to network capacity
• CPC Class Codes: B60L 53/65 involving identification of vehicles or their battery types
• CPC Class Codes: H02J 2310/12 The local stationary network supplying a household or a building
• CPC Class Codes: H02J 3/00 Circuit arrangements for ac mains or ac distribution networks
• CPC Class Codes: H02J 3/14 by switching loads on to, or off from, network, e.g. progressively balanced loading
• CPC Class Codes: H02M 7/00 Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• 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: Y02T 90/167 Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
• 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 20/222 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 30/14 Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Abstract

The present invention relates to a method (40) for transmitting electrical power between an energy supply grid (16) and an energy consumer (12) or energy producer (12) which is coupled to the energy supply grid (16), wherein at least one electrical variable of the energy supply grid (16) is detected, wherein a discrepancy between the electrical variable and a rated variable of the energy supply grid (16) which is associated with the electrical variable is determined, wherein the power transmission is controlled on the basis of the discrepancy, and wherein the electrical variable is a mains frequency and/or a mains voltage of the energy supply grid (16) and the rated variable is a rated frequency and/or rated voltage of the energy supply grid (16).

Claims

1. A method for transmitting electrical power between an energy supply grid and an energy consumer or energy generation unit coupled to the energy supply grid, the method comprising:

detecting a line frequency of the energy supply grid,

measuring a mains voltage of the energy supply grid,

determining a discrepancy between the line frequency and a rated frequency of the energy supply grid which is assigned to the line frequency,

defining a control range between a first and a second threshold value for the line frequency, the rated frequency being outside the control range,

controlling the power transmission within the control range on the basis of the discrepancy, and

when the discrepancy exceeds the control range, interrupting the power transmission on the basis of the measured mains voltage.

2. The method as claimed in claim 1, wherein the transmitted power in the control range is decreased continuously as the discrepancy increases.

3. The method as claimed in claim 1, wherein the transmitted power in the control range is increased continuously as the discrepancy decreases.

4. The method as claimed in claim 1, wherein a second control range between a third and a fourth threshold value for the line frequency is defined in which the power transmission is changed on the basis of the line frequency, wherein the rated frequency is between the second control range and the first control range.

5. The method as claimed in claim 4, wherein the transmitted power in the second control range is increased continuously as the discrepancy increases.

6. The method as claimed in claim 4, wherein the transmitted power in the second control range is decreased continuously as the discrepancy decreases.

7. The method as claimed in claim 1, wherein the threshold values for the line frequency are fixed on the basis of the rated frequency.

8. The method as claimed in claim 1, wherein the rated frequency is determined on the basis of the detected line frequency.

9. The method as claimed in claim 1, wherein the power is transmitted from the energy supply grid to the energy consumer, and wherein the first control range is defined below the rated frequency.

10. The method as claimed in claim 1, wherein the power is transmitted from the energy generation unit to the energy supply grid, and wherein the first control range is defined above the rated frequency.

11. The method as claimed in claim 1, wherein the control of the power transmission is switched off on the basis of an operating condition of the power transmission.

12. An apparatus for transmitting electrical power between an energy supply grid and an energy consumer or energy generation unit coupled to the energy supply grid, the apparatus comprising:

a detection unit for detecting a line frequency of the energy supply grid and a mains voltage of the energy supply grid,

an evaluation unit for determining a discrepancy between the line frequency and a rated frequency of the energy supply grid assigned to the line frequency, and

a control unit configured to

define a control range between a first and a second threshold value for the line frequency, the rated frequency being outside the control range,

control the power transmission within the control range on the basis of the discrepancy, and

when the discrepancy exceeds the control range, interrupting the power transmission on the basis of the measured mains voltage.

13. The apparatus as claimed in claim 12, wherein a control range between a first and a second threshold value of the line frequency is defined, wherein the rated frequency is outside the control range, and wherein the control unit is designed to decrease the transmitted power in the control range continuously as the discrepancy increases.