Power control system for energy storage devices, and control device and control method thereof

Patent metadata

Field	Value
Publication number	US-10097001-B2
Application number	US-201615052209-A
Country	US
Kind code	B2
Filing date	Feb 24, 2016
Priority date	Feb 26, 2015
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

Disclosed is a power control system for a plurality of energy storage devices, including: a first converter configured to perform a voltage conversion, the first converter having one end connected to a first power system and another end connected to a direct current (DC) linker; a second converter configured to perform a voltage conversion, the second converter having one end connected to a second power system and another end connected to the DC linker; a first energy storage device configured to store electric energy; a direct current-to-direct current (DC-DC) converter configured to perform a voltage conversion, the DC-DC converter having one end connected to the first energy storage device and another end connected to the DC linker; a second energy storage device connected to the DC linker and configured to store electric energy, and a control device.

First claim

What is claimed is:

1. A control device of a power control system for a plurality of energy storage devices including a first converter configured to perform a voltage conversion, the first converter having one end connected to any one of a first power system and a renewable energy source and another end connected to a direct current (DC) linker; a second converter configured to perform a voltage conversion, the second converter having one end connected to a second power system and another end connected to the DC linker; a first energy storage device configured to store electric energy; a direct current-to-direct current (DC-DC) converter configured to perform a voltage conversion, the DC-DC converter having one end connected to the first energy storage device and another end connected to the DC linker; and a second energy storage device connected to the DC linker and configured to store electric energy,
wherein the control device is configured to control a voltage of the first converter and a voltage of the second converter based on a voltage of the second energy storage device, and
wherein the control device comprises a reference marker configured to calculate reference power of the second energy storage device based on power of the first converter and power of the second converter and adjust a voltage of the DC linker based on the calculated reference power.

2. The control device of claim 1 , wherein the control device comprises a first controller configured to control the first converter and a second controller configured to control the second converter.

3. The control device of claim 1 , wherein the control device controls a voltage of the other end of the second converter connected to the DC linker based on the voltage of the second energy storage device and controls a voltage of the other end of the first converter connected to the DC linker based on the voltage of the other end of the second converter.

4. The control device of claim 1 , wherein the renewable energy source of the power control system is any one of a wind turbine power source, a photovoltaic source, a solar heat source, and a fuel cell.

5. The control device of claim 1 , wherein the voltage of the second energy storage device varies depending on a state of charge (SOC).

6. A power control system for a plurality of energy storage devices, the power control system comprising:
a first converter configured to perform a voltage conversion, the first converter having one end connected to any one of a first power system and a renewable energy source and another end connected to a direct current (DC) linker;
a second converter configured to perform a voltage conversion, the second converter having one end connected to a second power system and another end connected to the DC linker;
a first energy storage device configured to store electric energy;
a direct current-to-direct current (DC-DC) converter configured to perform a voltage conversion, the DC-DC converter having one end connected to the first energy storage device and another end connected to the DC linker;
a second energy storage device connected to the DC linker and configured to store electric energy; and
a control device configured to control a voltage of the first converter and a voltage of the second converter based on a voltage of the second energy storage device,
wherein the control device comprises a reference marker configured to calculate reference power of the second energy storage device based on power of the first converter and power of the second converter and adjust a voltage of the DC linker based on the calculated reference power.

7. The power control system of claim 6 , wherein the control device comprises a first controller configured to control the first converter and a second controller configured to control the second converter.

8. The power control system of claim 6 , wherein the control device controls a voltage of the other end of the second converter connected to the DC linker based on the voltage of the second energy storage device and controls a voltage of the other end of the first converter connected to the DC linker based on the voltage of the other end of the second converter.

9. The power control system of claim 6 , wherein the renewable energy source of the power control system is any one of a wind turbine power source, a photovoltaic source, a solar heat source, and a fuel cell.

10. The power control system of claim 6 , wherein the voltage of the second energy storage device varies depending on a state of charge (SOC).

11. A control method of a power control system for a plurality of energy storage devices including a first converter configured to perform a voltage conversion, the first converter having one end connected to any one of a first power system and a renewable energy source and another end connected to a direct current (DC) linker; a second converter configured to perform a voltage conversion, the second converter having one end connected to a second power system and another end connected to the DC linker; a first energy storage device configured to store electric energy; a direct current-to-direct current (DC-DC) converter configured to perform a voltage conversion, the DC-DC converter having one end connected to the first energy storage device and another end connected to the DC linker; and a second energy storage device connected to the DC linker and configured to store electric energy, the control method comprising:
setting a reference voltage of the second energy storage device;
setting a voltage of the other end of the second converter based on the set reference voltage of the second energy storage device;
setting a voltage of the other end of the first converter based on the set voltage of the other end of the second converter;
calculating, by a control device of the power control system, reference power of the second energy storage device based on power of the first converter and power of the second converter; and
adjusting, by the control device, a voltage of the DC linker based on the calculated reference power.

12. The control method of claim 11 , wherein the renewable energy source of the power control system is any one of a wind power source, a photovoltaic source, a solar heat source, and a fuel cell.

Assignees

• Univ Yonsei Iacf

Inventors

• Hur Kyeon
• SHIM Jaewoong

Classifications

• H02J3/36 Primary

  Arrangements for transfer of electric power between AC networks via high-voltage DC [HVDC] links; Arrangements for transfer of electric power between generators and networks via HVDC links · CPC title

• H02J3/381

  Dispersed generators · CPC title

• Y02E70/30

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

• Y04S10/126

  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 title

• Y02E60/60

  Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD] · CPC title