KR20170026695A - Hybrid energy storage system - Google Patents

Hybrid energy storage system Download PDF

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Publication number
KR20170026695A
KR20170026695A KR1020150120234A KR20150120234A KR20170026695A KR 20170026695 A KR20170026695 A KR 20170026695A KR 1020150120234 A KR1020150120234 A KR 1020150120234A KR 20150120234 A KR20150120234 A KR 20150120234A KR 20170026695 A KR20170026695 A KR 20170026695A
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KR
South Korea
Prior art keywords
power
load
converter
supplied
bidirectional
Prior art date
Application number
KR1020150120234A
Other languages
Korean (ko)
Inventor
백석민
이동주
황동옥
최제왕
최준영
신기엽
Original Assignee
데스틴파워 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 데스틴파워 주식회사 filed Critical 데스틴파워 주식회사
Priority to KR1020150120234A priority Critical patent/KR20170026695A/en
Publication of KR20170026695A publication Critical patent/KR20170026695A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/002—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which a reserve is maintained in an energy source by disconnecting non-critical loads, e.g. maintaining a reserve of charge in a vehicle battery for starting an engine
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems

Abstract

The present invention relates to a hybrid energy storage system, which comprises: a power part which supplies power for supplying power to at least two loads; a switching part which converts to apply each power to at least two loads; a power converting part which includes a bi-directional AC-DC converter, a DC-AC converter, a bi-directional DC-DC converter, and a battery; at least two loads; and a control part.

Description

[0001] HYBRID ENERGY STORAGE SYSTEM [0002]

The present invention relates to a hybrid energy storage system (Hybrid ESS).

Uninterruptible power supply (UPS) is also used to prevent loss of machine and computer information during power outage. It is used in various communication facilities such as satellite communication ground station, power station, communication base station, chemical / fiber plant, test And other stable power supply equipments such as high-tech equipments such as production facilities, bank / securities, LAN / WAN, PC Server, medical equipments, optical equipments such as optical equipments, This is an emergency power supply that continuously supplies power to the load in case the power supplied to the load is not supplied, for example, the voltage of the internal electric circuit is cut off. And is a device for supplying a stable AC power of good quality.

In recent years, when a general power supply or a spare power supply is used, it is a device that prevents power supply malfunction due to voltage fluctuation, frequency fluctuation, instantaneous power failure, transient voltage, etc. and supplies stable power. As the demand for highly reliable systems increases, so does demand.

The energy storage system (ESS) is installed in each link system including power plant, substation, transmission line, etc., where power generated by new and renewable energy such as solar power generation and wind power generation, It is a system that maximizes energy efficiency through selective and efficient use after power saving. It stores idle power at night and uses power stored in daytime when power consumption is high. The need for high-efficiency, low-cost energy storage systems (ESS) is expanding to prepare for power uncertainties caused by various environmental changes such as power outage, Japanese nuclear disaster, and the spread of new and renewable energy.

The energy storage system (ESS) is a system developed to minimize the industrial damage caused by large power outage at the peak of electric power. It stores electric power in the energy storage system (ESS) at light time (light load) , It is common to discharge electric power stored at a high power charge time (maximum load).

In recent years, products that incorporate an uninterruptible power supply (ESS) and an energy storage system (ESS) have been introduced, called a hybrid uninterruptible power supply (hybrid ESS) or hybrid energy storage device (hybrid ESS) Power can be supplied to the load in any situation without power short, it can be driven without power failure, and it can be switched to UPS mode or ESS mode depending on the situation.

However, such a system converts a mode so that one load can be driven without a power failure, and thus there is a limit in being able to manage each situation according to a plurality of loads.

Korean Unexamined Patent Publication No. 10-2015-0008767 (published on Jan. 23, 2015, entitled " Energy Storage System "

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hybrid energy storage device (ESS) including a UPS function for supplying power according to a plurality of loads.

According to an aspect of the present invention, there is provided a hybrid energy storage system including: an AC power source unit for supplying power to a plurality of loads; a switch unit for switching power to be supplied to a plurality of loads; A load 1 connecting a common load, a load 2 connecting an important load, a load 3 connecting a very important load, and a control unit.

According to the embodiment of the present invention, a power conversion device equipped with a UPS function is provided by using a bidirectional AC-DC converter, a bidirectional DC-DC converter, and an inverter to provide power without any interruption And it is possible to switch to the ESS mode or the UPS mode according to the operation, so that various operations can be performed.

1 is a diagram illustrating a configuration of a hybrid energy storage device according to an embodiment of the present invention.
2 is a diagram illustrating a detailed configuration of a hybrid energy storage device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

Hereinafter, a hybrid energy storage device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

First, the main functions of a hybrid energy storage device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.

FIG. 1 is a view for explaining a main function of a hybrid energy storage device according to an embodiment of the present invention. Referring to FIG. 1, a power supply unit 10 for supplying power to a plurality of loads, a plurality of loads 40, 50, A power switching unit 30 including a battery, a load 1 40 connecting a general load, a load 2 50 connecting an important load, A load 3 (60) for connecting a very important load, and a controller (70).

FIG. 2 is a diagram for explaining a detailed function of the hybrid energy storage device according to the embodiment of the present invention. Referring to FIG. 2, a power supply unit 10 for supplying power to a plurality of loads, a plurality of loads 40, 50, DC converter 31, a DC-AC converter 32, a bidirectional DC-DC converter 33, and a battery, which are connected in parallel to each other, (30), a load 1 (40) connecting a general load, a load 2 (50) connecting an important load, a load 3 (60) connecting a very important load and a controller (70).

The definitions of the plurality of loads of the present invention can be defined as follows.

Load 1 (40) is a general load that does not become a problem for a certain period of time even if power is not supplied at the time of a power failure.

Load 2 (50) is an important load that must be supplied power from the battery for a certain period of time during a power failure.

The load 3 (60) is a very important load that must be supplied with power until the battery capacity is exhausted from the battery during a power failure.

The bidirectional AC-DC converter 31 has an input terminal connected to the output terminal of the switch unit 20 and an output terminal connected to the input terminals of the DC-AC converter 32 and the bidirectional DC-DC converter 33 at the same time.

The input terminal of the DC-AC converter 32 is connected to the output terminal of the bidirectional AC-DC converter 31 and the output terminal of the bidirectional DC-DC converter 33, and the output terminal is connected to the load 3 (60).

The input terminal of the bidirectional DC-DC converter 33 is connected to the battery 34 and the output terminal is connected to the output terminal of the bidirectional AC-DC converter 31 and the input terminal of the DC-AC converter 32 at the same time.

The bidirectional AC-DC converter 31 receives the input AC power of the power supply unit 20 and converts the AC power to a DC power source to charge the battery 34 via the bidirectional DC-DC converter 33, 32 to the load 3 (60).

The DC-AC converter 32 receives the output of the bidirectional AC-DC converter 31 or the bidirectional DC-DC converter 33 and applies it to the load 3 (60).

The bidirectional DC-DC converter 33 controls the level of the output voltage of the bidirectional AC-DC converter 31 under the control of the controller 70 to convert the voltage into a level capable of charging the battery 34, And adjusts the level of the voltage charged in the battery 34 and outputs it to the DC-AC converter 32 or the bidirectional AC-DC converter 31.

Such a hybrid energy storage system can function as an energy storage device (ESS) or an uninterruptible power supply (UPS) under the control of the controller 70. [

Hereinafter, the operation of the hybrid energy storage system (Hybrid ESS) according to the embodiment of the present invention will be described in detail with reference to FIG.

The hybrid energy storage device of the present invention can be operated in four modes depending on the situation.

The first mode (mode 1) is a charging mode and operates normally. When electricity is normally supplied, the power conversion unit 30 and the load 2 are switched from the power supply unit 10 to the load 1 40 and the load 2 50, Power is supplied regardless.

The load 3 60 is supplied with power from the bidirectional AC-DC converter 31 through the DC-AC converter 32 through the DC-AC converter 32, .

That is, in the first mode, the power supply unit 10 normally powers the load 1 40, the load 2 50, and the load 3 60 while charging the battery 34 at the same time.

In the second mode (mode 2), power is supplied to the load 1 (40) and the load 2 (50) in the power supply unit 10 regardless of the power conversion unit 30, The power supplied from the power supply unit 10 is converted into direct current (DC) from the bidirectional AC-DC converter 31 and applied to the DC-AC converter 32. The applied direct current (DC) AC converter 32 to AC 3 and supplies it to the load 3 60 and at the same time DC is applied to the DC-AC converter 32 through the output terminal of the bidirectional DC-DC converter 33 And the applied direct current is converted to alternating current (AC) in the DC-AC converter 32 and applied to the load 3 (60).

An example of such a case is that when the battery is charged at a time when the electricity rate is inexpensive and is used at a time when the electricity rate is high, the electric bill can be saved.

The third mode (mode 3) is another example of the demand management mode. In the power supply section 10, power can be supplied only to the load 1 (40) regardless of the power conversion section 30, Power is not supplied through the power supply unit 10 and the power charged in the battery 34 is supplied to the load 2 50 and the load 3 60 via the bidirectional DC- The load 2 50 is supplied with a direct current through the bidirectional DC-DC converter 33, and the supplied direct current is converted from the bidirectional AC-DC converter 31 into an AC, AC converter 32 through the output terminal of the bidirectional DC-DC converter 33 and the supplied DC is supplied to the DC-AC converter 32 (AC) and supplied to the load 3 (60).

An example of such a case is to prevent a power failure due to a power peak when the power source of the power source unit 10 is unstable or when power is likely to reach a peak value.

The fourth mode (mode 4) is an emergency mode. At this time, no power is supplied from the power supply unit 10, and power is supplied to the load 2 50 and the load 3 60 only by the power of the battery 34.

In this case, the power charged in the battery 34 is supplied to the load 2 50 and the load 3 60 via the bidirectional DC-DC converter 33. The load 2 50 is a bidirectional DC-DC DC converter 31 is converted into AC and supplied to the load 2 50. At the same time, the output of the bidirectional DC-DC converter 33 is supplied to the load 2 (DC) is supplied to the DC-AC converter 32 through the DC-AC converter 32, and the supplied direct current is converted into alternating current (AC) in the DC-AC converter 32 and supplied to the load 3 (60).

An example of such a case is to supply power to the load 2 50 and the load 3 60 from the battery in an emergency mode in which the power source 10 is no longer supplied due to a fault such as a short circuit, Thereby preventing the supply of power to an important load from being interrupted.

The direction of discharge of the power conversion unit 30 according to each mode may be variously changed according to the control of the control unit 70. [

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

10: power supply unit 20: switch unit
30: Power converter 31: Bi-directional AC-AC converter
32: DC-AC conversion unit 33: Bi-directional DC-DC converter
34: Battery 40: Load 1
50: load 2 60: load 3
70:

Claims (2)

A power supply for supplying power to at least two loads,
A switch unit for switching power to be applied to at least two loads,
A power conversion unit including a bidirectional AC-DC converter, a DC-AC converter, a bidirectional DC-DC converter and a battery,
At least two loads, and
The control unit
Lt; / RTI > The method according to claim 1,
The at least two loads are divided into a load 1, a load 2 and a load 3,
Load 1 is a general load that does not become a problem for a certain period of time even if power is not supplied at the time of power failure,
Load 2 is an important load that must be supplied from the battery for a certain period of time during a power failure,
And the load 3 is a very important load that must be supplied with power until the capacity of the battery is exhausted from the battery during a power failure.
KR1020150120234A 2015-08-26 2015-08-26 Hybrid energy storage system KR20170026695A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190032999A (en) 2017-09-20 2019-03-28 에스퓨얼셀(주) Renewable energy hybrid power generation system, and power generation method therefor
KR20190061497A (en) * 2017-11-28 2019-06-05 엘에스산전 주식회사 An energy storage system
KR20200003586A (en) * 2018-07-02 2020-01-10 충북대학교 산학협력단 Controller of Hybrid Uninterruptible Power Supply including Energy Storage System
KR20200022082A (en) 2018-08-22 2020-03-03 에스퓨얼셀(주) Renewable energy hybrid power generation system, and power generation method therefor
US20230049346A1 (en) * 2021-08-12 2023-02-16 Delta Electronics, Inc. Ground fault detection apparatus and method of detecting ground fault

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150008767A (en) 2013-07-15 2015-01-23 엘지이노텍 주식회사 Energy storage system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150008767A (en) 2013-07-15 2015-01-23 엘지이노텍 주식회사 Energy storage system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190032999A (en) 2017-09-20 2019-03-28 에스퓨얼셀(주) Renewable energy hybrid power generation system, and power generation method therefor
KR20190061497A (en) * 2017-11-28 2019-06-05 엘에스산전 주식회사 An energy storage system
KR20200003586A (en) * 2018-07-02 2020-01-10 충북대학교 산학협력단 Controller of Hybrid Uninterruptible Power Supply including Energy Storage System
KR20200022082A (en) 2018-08-22 2020-03-03 에스퓨얼셀(주) Renewable energy hybrid power generation system, and power generation method therefor
US20230049346A1 (en) * 2021-08-12 2023-02-16 Delta Electronics, Inc. Ground fault detection apparatus and method of detecting ground fault
US11754638B2 (en) * 2021-08-12 2023-09-12 Delta Electronics, Inc. Ground fault detection apparatus and method of detecting ground fault

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