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

Patent metadata

Field	Value
Publication number	US-2016254665-A1
Application number	US-201615052209-A
Country	US
Kind code	A1
Filing date	Feb 24, 2016
Priority date	Feb 26, 2015
Publication date	Sep 1, 2016
Grant date	—

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 new 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.

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 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.

4 . 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 a 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.

5 . The control device of claim 1 , wherein the new 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.

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

7 . 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 new 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 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.

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

9 . The power control system of claim 7 , 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.

10 . The power control system of claim 7 , wherein the control device controls a voltage of the other end of the second converter connected to the DC linker based on avoltage 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.

11 . The power control system of claim 7 , wherein the new 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.

12 . The power control system of claim 7 , wherein the voltage of the second energy storage device varies depending on a state of charge (SOC).

13 . 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 new 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 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; and setting a voltage of the other end of the first converter based on the set voltage of the other end of the second converter.

14 . The control method of claim 13 , wherein the new 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

• Industry-Academic Cooperation Foundation Yonsei Univ

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

• 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

• H02J3/381

  Dispersed generators · CPC title