POWER SUPPLY SYSTEM AND METHOD INCLUDING POWER GENERATOR AND STORAGE DEVICE

• US 20120069614A1
• Filed: 09/14/2011
• Published: 03/22/2012
• Est. Priority Date: 09/20/2010
• Status: Active Grant

• Current Assignee: Industry Academic Cooperation Foundation
• Original Assignee: Industry Academic Cooperation Foundation
• Inventors: PARK, JUNG-WOOK, Kang, Byung-Kwan, Lee, Hyun-Koo, Kim, Seung-Tak
• Granted Patent: US 8,552,583 B2
• Time in Patent Office: Days
• US Class Current: 363/97
• CPC Class Codes: H02M 3/1582 Buck-boost converters H02M3/1584 takes precedence
• CPC Class Codes: H02M 3/1586 switched with a phase shift, i.e. interleaved

Abstract

The present invention relates to a power supply system and method including a power generator and a storage device. Specifically, the power supply method using a power supply system which includes a power generator, a storage device, a unidirectional converter, and a bidirectional interleaved converter, and in which the other side of the unidirectional converter is connected to the other side of the bidirectional interleaved converter and power is output from the other side of the unidirectional converter, the power supply method comprises measuring one or more of an amount of power generation of the power generator and an amount of power storage of the storage device; forming a power transfer path by analyzing one or more of the amount of power generation and the amount of power storage; and controlling activation of devices on the formed power transfer path.

Claims

1. A power supply system comprising:

a power generator generating electrical energy;

a storage device storing the electrical energy;

an inverter converting a DC power into an AC power and transferring the AC power to a system;

a unidirectional converter connected to the inverter through the other side thereof to transfer power input through one side thereof to the other side thereof with its voltage changed;

a bidirectional interleaved converter connected to the other side of the unidirectional converter through the other side thereof to transfer the power input through one side thereof to the other side thereof through an interleaving method with its voltage changed or to transfer the power input through the other side thereof to the one side thereof through the interleaving method with its voltage changed; and

a path forming device forming a power transfer path between the power generator, the one side of the unidirectional converter, the one side of the bidirectional interleaved converter, and the storage device.

2. The power supply system of claim 1, wherein the path forming device forms a first path for connecting the power generator to the one side of the unidirectional converter and connecting the storage device to the one side of the bidirectional interleaved converter, or a second path for connecting the power generator to the one side of the bidirectional interleaved converter.

3. The power supply system of claim 2, further comprising one or more of

a first sensor measuring an amount of power generation of the power generator;

a second sensor measuring an amount of power storage of the storage device; and

a third sensor measuring an amount of load of the system.

4. The power supply system of claim 3, wherein the path forming device receives one or more measured values of the amount of power generation, the amount of power storage, and the amount of load, and forms the first or second path.

5. The power supply system of claim 4, wherein the path forming device forms the first path if the amount of power storage is equal to or smaller than a minimum amount of power storage.

6. The power supply system of claim 4, wherein the path forming device forms the second path if the amount of power storage exceeds a sufficient amount of power storage.

7. The power supply system of claim 4, wherein the path forming device forms the second path if the amount of power generation exceeds the amount of load.

8. The power supply system of claim 1, wherein the path forming device forms the second path if the amount of power generation is equal to or larger than a predetermined value, and forms the first path if the amount of power generation is smaller than the predetermined value.

9. The power supply system of claim 1, wherein the path forming device comprises:

a first switch unit having a first terminal connected to the power generator and a second terminal connected to the unidirectional converter, and connecting the first terminal to one of the second terminal and a third terminal; and

a second switch unit having a first terminal connected to the storage device, a second terminal connected to the bidirectional interleaved converter, and a third terminal connected to the third terminal of the first switch unit, and connecting the second terminal to one of the first terminal and the third terminal.

10. The power supply system of claim 9, wherein the path forming device connects the first terminal to the second terminal of the first switch unit and connects the first terminal to the second terminal of the second switch unit, or

connects the first terminal to the third terminal of the first switch unit and connects the second terminal to the third terminal of the second switch unit.

11. A power supply system comprising:

a power generator generating electrical energy;

a storage device storing the electrical energy;

an inverter converting a DC power into an AC power and transferring the AC power to a system;

a unidirectional converter connected to the inverter through the other side thereof to transfer power input through one side thereof to the other side thereof with its voltage changed;

a bidirectional interleaved converter connected to the other side of the unidirectional converter through the other side thereof to transfer the power input through one side thereof to the other side thereof through an interleaving method with its voltage changed or to transfer the power input through the other side thereof to the one side thereof through the interleaving method with its voltage changed, and to change the number of current paths for power conversion according to a control signal;

a path forming device forming a power transfer path between the power generator, the one side of the unidirectional converter, the one side of the bidirectional interleaved converter, and the storage device; and

a controller controlling a power transfer direction of the bidirectional interleaved converter, the number of current paths for the power conversion, and forming of a path of the path forming device.

12. The power supply system of claim 11, wherein the path forming device forms a first path for connecting the power generator to the one side of the unidirectional converter and connecting the storage device to the one side of the bidirectional interleaved converter, or a second path for connecting the power generator to the one side of the bidirectional interleaved converter according to the control signal of the controller.

13. The power supply system of claim 11, wherein the controller adjusts the number of current paths for the power conversion of the bidirectional interleaved converter according to the amount of power generation of the power generator or the amount of power storage of the storage device.

14. The power supply system of claim 13, wherein the path forming device comprises:

a first switch unit having a first terminal connected to the power generator and a second terminal connected to the unidirectional converter, and connecting the first terminal to one of the second terminal and a third terminal; and

a second switch unit having a first terminal connected to the storage device, a second terminal connected to the bidirectional interleaved converter, and a third terminal connected to the third terminal of the first switch unit, and connecting the second terminal to one of the first terminal and the third terminal.

15. A power supply method using a power supply system which includes a power generator, a storage device, a unidirectional converter, and a bidirectional interleaved converter, and in which the other side of the unidirectional converter is connected to the other side of the bidirectional interleaved converter and power is output from the other side of the unidirectional converter, the power supply method comprising:

measuring one or more of an amount of power generation of the power generator and an amount of power storage of the storage device;

forming a power transfer path by analyzing one or more of the amount of power generation and the amount of power storage; and

controlling activation of devices on the formed power transfer path.

16. The power supply method of claim 15, wherein the path forming step forms one path of a first path for connecting the power generator to the one side of the unidirectional converter to transfer the power;

a second path for connecting the power generator to an input terminal of the unidirectional converter and connecting the one side of the bidirectional interleaved converter to the storage device to transfer the power; and

a third path for connecting the power generator to the one side of the bidirectional interleaved converter to transfer the power.

17. The power supply method of claim 15, wherein the controlling step changes the number of current paths for the power conversion of the bidirectional interleaved converter according to the amount of power generation or the amount of power storage in the case where the bidirectional interleaved converter is provided on the formed power transfer path.

18. A power supply system comprising:

a power generator generating electrical energy;

a storage device storing the electrical energy;

an inverter converting a DC power into an AC power and transferring the AC power to a system;

a first converter connected to the inverter to transfer input power to the inverter with its voltage changed;

a second converter which is connected to the inverter, is arranged in parallel to the first converter, and transfers input power to the inverter with its voltage changed, or transfers power input through the inverter to the storage device with its voltage changed;

a path forming device forming a power transfer path between the power generator, the first converter, the second converter, and the storage device; and

a controller controlling a power transfer direction of the second converter, the number of current paths for power conversion, and formation of a path of the path forming device.

19. The power supply system of claim 18, wherein the first converter transfers power by using at least one of a unidirectional converter, a bidirectional converter, a unidirectional interleaved converter and a bidirectional interleaved converter.

20. The power supply system of claim 18, wherein the second converter transfers power in both directions by using at least one of a bidirectional converter and a bidirectional interleaved converter.

21. The power supply system of claim 18, further comprising at least one of

a first sensor measuring an amount of power generation of the power generator;

a second sensor measuring an amount of power storage of the storage device; and

a third sensor measuring an amount of load of the system.

22. The power supply system of claim 21, wherein the path forming device connects the power generator with the first converter and connects the storage device with the second converter if the amount of power storage exceeds a predetermined minimum amount of power storage and is equal to or smaller than a predetermined maximum amount of power storage, and the amount of power generation exceeds the amount of load.

23. The power supply system of claim 21, wherein the path forming device connects the power generator with the first converter and connects the storage device with the second converter if the amount of power storage is equal to or larger than a predetermined minimum amount of power storage and is smaller than a predetermined maximum amount of power storage, and the amount of load exceeds the amount of power generation.

24. The power supply system of claim 21, wherein the path forming device connects the power generator with at least one of the first converter and the second converter if the amount of power storage is equal to or smaller than a predetermined minimum amount of power storage, and the amount of load exceeds the amount of power generation.

25. The power supply system of claim 21, wherein the path forming device connects the power generator with at least one of the first converter and the second converter if the amount of power storage is equal to or larger than a predetermined maximum amount of power storage, and the amount of power generation exceeds the amount of load.

26. The power supply system of claim 21, wherein the path forming device connects the power generator with the first converter and connects the storage device with the second converter if the amount of power storage is equal to or smaller than a predetermined minimum amount of power storage, and the amount of power generation exceeds the amount of load.

27. The power supply system of claim 21, wherein the path forming device connects the power generator with the first converter and connects the storage device with the second converter if the amount of power storage is equal to or larger than a predetermined maximum amount of power storage, and the amount of load exceeds the amount of power generation.

28. The power supply system of claim 21, wherein the path forming device connects the storage device with at least one of the first converter and the second converter if the amount of power generation is insufficient to supply power to the system.

29. The power supply system of claim 21, wherein the controller changes the number of the current paths based on the amount of power generation or the amount of power storage.