Circuit arrangement

Patent metadata

Field	Value
Publication number	US-9627890-B2
Application number	US-201214348683-A
Country	US
Kind code	B2
Filing date	Aug 29, 2012
Priority date	Sep 29, 2011
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A circuit arrangement has a bidirectional AC/DC converter connected to a first side of a DC/DC converter at a DC side of the AC/DC converter via first electric switch. The AC/DC converter is connected to a second side of the DC/DC converter at the DC side of the AC/DC converter via a second electric switch. The first side of the DC/DC converter is connected to a third electric switch and can be connected to an energy storing device via said switch. The second side of the DC/DC converter is connected to a fourth electric switch and can be connected to an energy generating device via said switch. The AC/DC converter can be connected to the electric supply grid at the AC side of the AC/DC converter. A control device controls the switches and the converters.

First claim

The invention claimed is:

1. A circuit arrangement for a variable interconnection of energy generation and storage devices, comprising:
a bidirectional AC-to-DC converter having a DC side and an AC side, the AC side being connected to an electrical supply grid;
a first electrical switch connected to the DC side of the AC-to-DC converter;
a DC-to-DC converter having first and second sides, the first side of the DC-to-DC converter being connected to the DC side of the AC-to-DC converter via the first electrical switch;
a second electrical switch which connects the DC side of the AC-to-DC converter to the second side of the DC-to-DC converter;
a third electrical switch connected to the first side of the DC-to-DC converter;
an energy storage device connected to the first side of the DC-to-DC converter via the third electrical switch;
a fourth electrical switch connected to the second side of the DC-to-DC converter;
an energy generation device connected to the second side of the DC-to-DC converter via the fourth switch; and
a control device to selectively actuate the electrical switches and the converters.

2. The circuit arrangement as claimed in claim 1 , wherein the DC-to-DC converter is a bidirectional DC-to-DC converter.

3. The circuit arrangement as claimed in claim 1 , wherein
the DC-to-DC converter is configured to be unidirectional,
a fifth electrical switch is connected to the second side of the DC-to-DC converter, and
the second side of the DC-to-DC converter is connected to the energy storage device via the fifth electrical switch.

4. The circuit arrangement as claimed in claim 3 , wherein
the control device closes the fifth and first electrical switches and opens the second through fourth electrical switches, such that a current path connects the energy storage device via the DC-to-DC converter and the AC-to-DC converter to the electrical supply grid, in order to feed electrical energy stored in the energy storage device back to the electrical supply grid.

5. The circuit arrangement as claimed in claim 3 , wherein the control device closes the third and fourth electrical switches and opens the first, second and fifth electrical switches in order to feed the energy storage device from the energy generation device.

6. The circuit arrangement as claimed in claim 5 , wherein the control device closes the fourth and first electrical switches and opens the second, third and fifth electrical switches in order to feed energy generated in the energy generation device back to the electrical supply grid.

7. The circuit arrangement as claimed in claim 6 , wherein the control device comprises an optimization unit, configured to compute optimum actuation of the electrical switches taking into consideration predeterminable boundary conditions, wherein the boundary conditions comprise at least one type of information selected from the group consisting of:
outputs as low as possible for current drawn from the electrical supply grid,
intakes as high as possible for current fed back to the electrical supply grid,
electricity price fixed by an energy supplier,
electricity price statistically varying based on time of day,
controlling use of the energy storage device,
weather forecast, and
controlling state of charge of the energy storage device.

8. The circuit arrangement as claimed in claim 5 , wherein the control device closes the second and the third electrical switches and opens the first, fourth and fifth electrical switches in order to charge the energy storage device from the supply grid.

9. The circuit arrangement as claimed in claim 8 , wherein the control device comprises an optimization unit, configured to compute optimum actuation of the electrical switches taking into consideration predeterminable boundary conditions, wherein the boundary conditions comprise at least one type of information selected from the group consisting of:
outputs as low as possible for current drawn from the electrical supply grid,
intakes as high as possible for current fed back to the electrical supply grid,
electricity price fixed by an energy supplier,
electricity price statistically varying based on time of day,
controlling use of the energy storage device,
weather forecast, and
controlling state of charge of the energy storage device.

10. The circuit arrangement as claimed in claim 3 , wherein the control device closes the fourth and first electrical switches and opens the second, third and fifth electrical switches in order to feed energy generated in the energy generation device back to the electrical supply grid.

11. The circuit arrangement as claimed in claim 3 , wherein the control device closes the second and the third electrical switches and opens the first, fourth and fifth electrical switches in order to charge the energy storage device from the supply grid.

12. The circuit arrangement as claimed in claim 1 , wherein the control device comprises an optimization unit, configured to compute optimum actuation of the electrical switches taking into consideration predeterminable boundary conditions, wherein the boundary conditions comprise at least one type of information selected from the group consisting of:
outputs as low as possible for current drawn from the electrical supply grid,
intakes as high as possible for current fed back to the electrical supply grid,
electricity price fixed by an energy supplier,
electricity price statistically varying based on time of day,
controlling use of the energy storage device,
weather forecast, and
controlling state of charge of the energy storage device.

Assignees

• Buchstaller Dominic
• Reinschke Johannes
• Siemens Ag

Inventors

• Buchstaller Dominic
• Reinschke Johannes

Classifications

• H02J7/35

  with light sensitive cells · CPC title

• H02J3/381 Primary

  Dispersed generators · CPC title

• Y02E70/30

  Systems combining energy storage with energy generation of non-fossil origin · CPC title

• H02J2101/24

  Photovoltaics · CPC title

• Y10T307/305

  Cross-Sectional Technologies · mapped topic