Energy storage arrangement, energy storage system and method for operating an energy storage arrangement
View Patent ↗An energy storage arrangement or configuration includes an energy store or storage device which can be connected to an electrical energy supply via a buck converter and a choke device. A boost converter is connected parallel with the energy store and the buck converter. The energy store is configured to be charged to a higher voltage level than the voltage level of the electrical energy supply. An energy storage system having multiple energy storage configurations and a method for operating an energy storage configuration are also provided.
1. An energy storage configuration, comprising:
an energy storage device;
a buck converter and a choke device to be connected between said energy storage device and an electrical energy supply having a voltage level; and
a boost converter connected parallel to said energy storage device and said buck converter;
said energy storage device being configured to be charged to a higher voltage level than the voltage level of the electrical energy supply; and
said choke device configured to guide a current flow from the electrical energy supply to said energy storage device when said boost converter is switched off.
2. The energy storage configuration according to claim 1 , wherein said buck converter has a terminal for a voltage to be stepped down and said terminal is connected to said energy storage device.
3. The energy storage configuration according to claim 1 , wherein said choke device is constructed to act as a controller choke and as a line filter choke.
4. The energy storage configuration according to claim 3 , which further comprises a pre-charging device connected upstream of said choke device.
5. The energy storage configuration according to claim 1 , which further comprises a pre-charging device connected upstream of said energy storage device.
6. The energy storage configuration according to claim 5 , wherein said pre-charging device is connected between said buck converter and said energy storage device.
7. The energy storage configuration according to claim 5 , wherein said pre-charging device has a pre-charging resistor and a pre-charging switching device.
8. The energy storage configuration according to claim 5 , which further comprises an energy storage device switching device connected parallel to said pre-charging device.
9. The energy storage configuration according to claim 1 , which further comprises a safety device connected downstream of said energy storage device.
10. The energy storage configuration according to claim 1 , wherein the electrical energy supply is a rail power supply network.
11. The energy storage configuration according to claim 1 , wherein said energy storage device is a mobile energy storage device of a vehicle.
12. The energy storage configuration according to claim 1 , wherein said energy storage device is a stationary energy storage device.
13. The energy storage configuration according to claim 1 , wherein said energy storage device is at least one of an electrochemical energy storage device or an electrical energy storage device or a pseudocapacitor.
14. An energy storage system, comprising:
a plurality of energy storage configurations according to claim 1 being connected in parallel.
15. The energy storage system according to claim 14 , wherein said choke device is configured to connect all of said parallel-connected energy storage configurations to the electrical energy supply network.
16. The energy storage system according to claim 14 , wherein said choke device is one of a plurality of choke devices each configured to connect a respective one of said parallel-connected energy storage configurations to the electrical energy supply network.
17. A method for operating an energy storage configuration, the method comprising the following steps:
providing an energy storage device, a buck converter having a terminal for a voltage to be stepped down, a choke device and a boost converter, the energy storage device being connected to the terminal of the buck converter, the buck converter and the choke device configured to be connected between the energy storage device and an electrical energy supply, and the boost converter being connected parallel to the energy storage device and the buck converter;
charging the energy storage device by switching on the boost converter to short circuit the electrical energy supply in accordance with its clock rate, limiting a resulting current by using the choke device, switching off the boost converter in accordance with its clock rate, and subsequently guiding a current flow from the electrical energy supply through the choke device and into the energy storage device while the boost converter is switched off; and
discharging the energy storage device by lowering an output voltage of the energy storage device to a voltage level of the electrical energy supply by using the buck converter.
18. The method according to claim 17 , which further comprises using a pre-charging device to pre-charge the energy storage device to the voltage level of the electrical energy supply.