Energy storage device for an electrical AC voltage grid

Patent metadata

Field	Value
Publication number	US-10110061-B2
Application number	US-201615245927-A
Country	US
Kind code	B2
Filing date	Aug 24, 2016
Priority date	Aug 25, 2015
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

An energy storage device for storing energy for a stationary AC voltage grid includes a control device; and at least two switching units. Each switching unit includes multiple storage elements for storing a part of the energy, a converter having an AC voltage connection for connection to the AC voltage grid and a DC voltage connection, and a multiplexer switching device electrically connected with the DC voltage connection of the converter and with one of the storage elements via a respective storage connection. The multiplexer switching device is configured to select one of the storage connections in dependence on a selection signal generated by the control device and to electrically connect only the one storage connection selected by multiplexer switching device with the DC voltage connection of the converter. The control device is configured to control the converter of each of the at least two switching units so as to gradually reduce an energy flow between the AC voltage grid and a first one of the switching units and to correspondingly increase an energy flow between the DC voltage grid and at least one second one of the switching units until the energy flow between the AC voltage grid and the first switching unit is reduced to zero.

First claim

What is claimed is:

1. An energy storage device for storing energy for a stationary AC voltage grid that includes at least one user and/or at least one regenerative energy source, said energy storage device comprising:
a control device; and
at least two switching units, each comprising multiple storage elements for storing a part of the energy, a converter having an AC voltage connection for connection to the AC voltage grid and a DC voltage connection, and a multiplexer switching device electrically connected with the DC voltage connection of the converter and with one of the storage elements via a respective storage connection, wherein the multiplexer switching device is configured to select one of the storage connections in dependence on a selection signal generated by the control device and to electrically connect only the one storage connection selected by multiplexer switching device with the DC voltage connection of the converter,
wherein the control device is configured to control the converter of each of the at least two switching units so as to gradually reduce an energy flow between the AC voltage grid and a first one of the switching units and to correspondingly increase an energy flow between the AC voltage grid and at least one second one of the switching units until the energy flow between the AC voltage grid and the first switching unit is reduced to zero.

2. The energy storage device of claim 1 , wherein the control device is configured to generate another selection signal after the energy flow between the AC voltage grid and the first switching unit is reduced to zero, and wherein the multiplexer switching device selects another storage element in the first switching unit as a function of the another selection signal.

3. The energy storage device of claim 1 , wherein each storage element has a monitoring device for determining respective operating state data of the storage element, and wherein the control device is configured to generate the selection signal in dependence on the operating state data of all storage elements so that a wear criterion for all storage elements is satisfied.

4. The energy storage device of claim 3 , wherein the operating state data include at least one state variable of the respective storage element selected from the group consisting of an age, a wear, a number of cycles, a state of charge, a residual capacity and a temperature.

5. The energy storage device of claim 3 , wherein the control device is configured to adjust a target voltage value in a voltage regulator of the converter in dependence on the operating state data of the storage element connected to the selected storage connection.

6. The energy storage device of claim 1 , further comprising a receiving device for receiving environmental data, wherein the control device is configured to generate the selection signal in dependence on the environmental data, to thereby take a future availability of a regenerative energy source into account and/or to compensate a future unavailability of a regenerative energy.

7. The energy storage device of claim 6 , wherein the environmental data are parameters of an external network and/or weather data.

8. The energy storage device of claim 1 , further comprising a detection device, wherein a network connection for connection of an electrical supply network is connected with the AC voltage grid via the detection device, wherein the detection device is configured to determine at least one electrical variable regarding an electrical external energy exchanged between the supply network and the AC voltage grid, and wherein the control device is configured to control each converter in dependence on the at least one electrical variable so that a balance of the exchanged external energy satisfies a predetermined minimizing criterion.

9. The energy storage device of claim 1 , wherein each multiplexer switching device has at least one mechanical switch and/or at least one transistor for selecting the storage element.

10. The energy storage device of claim 1 , wherein each storage element has at least one of a battery, a dual layer capacitor, a fuel cell, a flywheel storage and an emergency generator.

11. The energy storage device of claim 10 , wherein the battery is a vehicle high-voltage battery.

12. The energy storage device of claim 1 , further comprising at least one communication bus for connection of a battery internal battery control unit of a vehicle high-voltage battery, wherein the control device is configured to perform a restbus simulation on the battery control unit, said restbus simulation including a communication with at least one simulated control device of a moor vehicle.

Assignees

• Audi Ag

Inventors

• Hinterberger Michael
• Hellenthal Berthold
• Opitz Uwe

Classifications

• H02J7/56

  Active balancing, e.g. using capacitor-based, inductor-based or DC-DC converters · CPC title

• H02J7/82 Primary

  Control of state of charge [SOC] · CPC title

• H02M7/68

  by static converters · CPC title

• H02J3/18

  Arrangements for adjusting, eliminating or compensating reactive power in networks · CPC title

• H02J13/0006 Primary

  Electricity · mapped topic