KR20140075472A - Grid connected off line ac ups - Google Patents

Grid connected off line ac ups Download PDF

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Publication number
KR20140075472A
KR20140075472A KR1020120143849A KR20120143849A KR20140075472A KR 20140075472 A KR20140075472 A KR 20140075472A KR 1020120143849 A KR1020120143849 A KR 1020120143849A KR 20120143849 A KR20120143849 A KR 20120143849A KR 20140075472 A KR20140075472 A KR 20140075472A
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KR
South Korea
Prior art keywords
voltage
phase
power supply
power
output
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KR1020120143849A
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Korean (ko)
Inventor
임완수
양현열
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주식회사 피플웍스
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Priority to KR1020120143849A priority Critical patent/KR20140075472A/en
Publication of KR20140075472A publication Critical patent/KR20140075472A/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
    • H02J9/04—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
    • H02J9/062—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 for AC powered loads

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Inverter Devices (AREA)

Abstract

According to a preferred embodiment of the present invention, disclosed is a grid connected offline uninterruptable alternating current power supply device capable of supplying stable power without disconnection of power to a load at a grid power blackout and when a current is supplied after the blackout. The grid connected offline uninterruptable alternating current power supply device according to a preferred embodiment of the present invention comprises: a first voltage and phase detecting unit to detect a voltage size and a phase of power inputted from a grid; a direct current-alternating current inverter to convert a direct current voltage inputted from a battery to an alternating current voltage; a grid switch to output or block the power inputted from the gird; a control unit to control operations of the direct current-alternating current inverter and the grid switch; and a second voltage and phase detecting unit to detect a voltage size and a phase of an uninterruptable power supply device.

Description

Grid Connected Offline AC Uninterruptible Power Supply {GRID CONNECTED OFF LINE AC UPS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grid-connected off-line uninterruptible ac power source apparatus, and more particularly, to a grid-connected off-line uninterruptible ac power source apparatus capable of supplying a stable power source to a load even after power-

An uninterruptible power supply (UPS) is generally divided into an online AC uninterruptible power supply (UPS) and an offline AC uninterruptible power supply (OFF line AC UPS).

1 and 2 show an exemplary configuration diagram of the online AC uninterruptible power supply 100 and the offline AC uninterruptible power supply 200, respectively.

As can be seen from Fig. 1, the on-line AC uninterruptible power supply 100 has many power conversion steps, which results in lower efficiency as compared with the off-line AC uninterruptible power supply 200 and has a complicated circuit. In addition, although the off-line AC uninterruptible power supply 200 has a high efficiency and a simple circuit, it is disadvantageously cut off due to a power cut-off phenomenon in a power failure.

When the problem of power failure of the offline AC uninterruptible power supply 200 is solved, it is possible to develop a high efficiency, lightweight and low cost uninterruptible power supply device than other ac uninterruptible power supply devices or DC uninterruptible power supply devices.

Japanese Laid-Open Patent Application No. 10-2008-0079042 discloses a method of stably supplying an emergency power source when the system power source is a commercial power source. However, when power is supplied after power failure, the emergency power source supplies power to the system power source Is not disclosed.

SUMMARY OF THE INVENTION The present invention has as its object to solve the technical problems as described above, and it is an object of the present invention to provide a grid-connected off-line uninterruptible ac power supply apparatus capable of supplying a stable power source without interruption of power supply during power- And the like.

A grid-connected off-line uninterruptible ac power supply according to a preferred embodiment of the present invention includes a first voltage and a phase detector for detecting a voltage magnitude and a phase of a power source input from a system; A DC-AC conversion inverter for converting a DC voltage input from the battery into an AC voltage; A system switch capable of outputting or interrupting a power input from the system; A control unit for controlling operations of the DC-AC conversion inverter and the system switch; A second voltage and phase detector for detecting an output voltage magnitude and phase of the uninterruptible power supply unit or the DC-AC conversion inverter; And a charger for charging the battery using a power source input from the system.

The control unit receives the information from the first voltage and phase detector and the second voltage and phase detector and generates the voltage of the same phase and frequency as the power supplied from the system to be generated by the DC- AC inverter so as to control the DC-AC inverter.

Specifically, the control unit controls the output voltage of the DC-AC conversion inverter to be smaller than the voltage magnitude of the power source inputted from the system while the system power is normally supplied. Also, the control unit controls the DC-AC conversion inverter to output a voltage of a standard voltage level of the system power source while the system power source is in the blackout state.

The control unit compares the phase of the voltage of the system power supply and the phase of the output voltage of the DC-AC conversion inverter when the system power supply is changed from the power saving state to the power supply state, To be in phase with the phase of the voltage of the system power supply. Specifically, the matching of the voltage of the system by the control unit and the output voltage of the DC-AC conversion inverter is performed by changing the frequency of the output AC voltage of the DC-AC conversion inverter.

That is, when the phase of the output AC voltage of the DC-AC conversion inverter is higher than the phase of the system voltage, the phase of the DC voltage of the DC- - controlling the frequency of the output AC voltage of the AC inverter to be lower than the frequency of the system voltage and, when the phase of the output AC voltage of the DC-AC inverter is slower than the phase of the system voltage, And controlling the frequency of the output AC voltage to be higher than the frequency of the system voltage.

Further, the control unit turns on the system switch when the phase of the system voltage matches the phase of the output voltage of the DC-AC conversion inverter.

According to the grid-connected off-line uninterruptible ac power supply apparatus of one preferred embodiment of the present invention, a stable power source can be supplied to the load at the time of power failure of the system power source and power supply after power failure.

1 is a block diagram of an online AC uninterruptible power supply.
2 is a configuration diagram of a conventional offline AC uninterruptible power supply.
Fig. 3 is an illustration of a breakdown voltage of a power source supplied to a load by a conventional offline AC uninterruptible power supply. Fig.
4 is a configuration diagram of a grid-connected off-line AC uninterruptible power supply apparatus according to a preferred embodiment of the present invention
Fig. 5A is an illustration of a voltage without interruption of the power supplied to the load by the off-line ac uninterruptible power supply of the present invention. Fig.
FIGS. 5B and 5C show the first and second embodiments of the DC-AC conversion inverter 320 tracking the phase of the system.

Hereinafter, a grid-connected off-line uninterruptible ac power supply according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

It should be understood that the following embodiments of the present invention are only for embodying the present invention and do not limit or limit the scope of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

First, the problem of the conventional offline AC uninterruptible power supply 200 of FIG. 2 will be described in detail.

2, the conventional off-line AC uninterruptible power supply apparatus 200 turns on the system switch 240 so that the system power is normally supplied and the AC power is converted into the DC power The battery charger 230 is used to charge the battery.

In addition, the conventional offline AC uninterruptible power supply 200 drives a DC-AC converter 220 that detects DC power when the system power is cut off and converts the DC power of the battery into AC power, Supply. In this process, the system switch 240 is turned off at the time of a power failure, and the system switch 240 is turned on when the system power is again supplied. At this time, A power source different from the power source of the system is supplied to the load, that is, the load device is unstable.

That is, as shown in FIG. 3, when the power is switched from the energized state to the power-off state, the power supply interruption occurs at time t1. When the power supply is switched to the energized state, the power supply interruption occurs at the time t2.

4 is a configuration diagram of the grid-connected off-line AC uninterruptible power supply 300 according to a preferred embodiment of the present invention.

4, the grid-connected off-line AC uninterruptible power supply 300 according to the preferred embodiment of the present invention includes a DC-AC inverter 320, a charger 330, a system switch 340, A first voltage and phase detector 350, a second voltage and phase detector 360, and a controller 370.

The DC-AC conversion inverter 320 serves to convert a DC voltage input from the battery into an AC voltage. In addition, the charger 330 converts the AC power from the system to a DC power using a power source input from the system to charge the battery. The system switch 340 of the present invention plays a role of outputting or interrupting the power input from the system.

Also, the first voltage and phase detector 350 detects the magnitude and phase of the voltage of the power source inputted from the system. The second voltage and phase detector 360 detects the output voltage magnitude and phase of the uninterruptible power supply 300 or the DC-AC inverter 320 of the present invention.

The controller 370 receives the information from the first voltage and phase detector 350 and the second voltage and the phase detector 360 and controls the operation of the DC-AC inverter 320 and the system switch 340 .

Hereinafter, the operation of the control unit 370 of the present invention will be described in more detail.

The control unit 370 of the present invention controls the DC-AC conversion inverter 320 so that the DC-AC conversion inverter 320 can generate a voltage having the same phase and frequency as the power supplied from the system.

The controller 370 of the present invention controls the output voltage of the DC-AC inverter 320 to be smaller than the voltage magnitude of the power source inputted from the system while the system power is normally supplied, AC inverter 320 outputs a voltage of a standard voltage magnitude of the system power supply while the DC power supply is in the ON state. That is, even when the system power is normally supplied, the DC-AC inverter 320 outputs a voltage of the same phase and frequency as that of the system power supply, but outputs only a voltage lower than the system power. Since the phase and frequency of the voltage are the same as those of the system power supply when the system power supply is out of power, only the magnitude of the voltage is the same as the standard voltage level of the system power supply, The break phenomenon does not occur.

5A is an exemplary diagram of a voltage supplied to a load that does not cause a power interruption even after a power interruption due to power-on by the grid-connected off-line AC uninterruptible power supply 300 of the present invention, and even after power failure. 5B and 5C are the first and second embodiments of the DC-AC inverter 320 for tracking the phase of the system.

Next, when the system power supply is changed from the electrostatic state to the energized state, the control unit 370 of the present invention compares the phase of the voltage of the system power supply and the phase of the output voltage of the DC-AC inverter 320, And controls the phase of the output voltage of the AC inverter 320 to match the phase of the voltage of the system power supply.

Specifically, the system voltage by the control unit 370 and the phase of the output voltage of the DC-AC inverter 320 are matched by changing the frequency of the output AC voltage of the DC-AC inverter 320 .

That is, the coincidence between the voltage of the system by the control unit 370 of the present invention and the output voltage of the DC-AC conversion inverter is determined by the phase of the output AC voltage of the DC-AC conversion inverter 320 And the frequency of the output AC voltage of the DC-AC inverter 320 is controlled to be lower than the frequency of the system voltage when the phase of the DC voltage is faster than the phase of the system voltage. That is, if the frequency of the output AC voltage of the DC-AC inverter 320 is controlled to be lower than the frequency of the system voltage and becomes equal to the phase of the system voltage, the frequency of the output AC voltage of the DC- Of the frequency of the signal.

5C, when the phase of the output AC voltage of the DC-AC inverter 320 is slower than the phase of the system voltage, the frequency of the output AC voltage of the DC- The frequency of the output AC voltage of the DC-AC inverter 320 becomes equal to the frequency of the system voltage.

The control unit 370 of the present invention controls the system switch 340 when the system voltage is changed from the electrostatic state to the energized state when the system voltage matches the output voltage of the DC- And controls the output voltage of the DC-AC inverter 320 to be smaller than the voltage magnitude of the power source input from the system.

According to the present invention, even when the system power supply is changed from the electrostatic state to the energized state, the stable power can be supplied to the load without interruption of the power supply as shown in Figs. 5A to 5C by the control of the controller 370 .

As described above, according to the grid-connected off-line uninterruptible ac power supply device 300 of the preferred embodiment of the present invention, it is possible to supply a stable power source without interruption of power supply during power failure and power supply after power failure, .

100: Online AC Uninterruptible Power Supply
110: AC-DC converter 120: DC-AC conversion inverter
130: Charger
200: Configuration diagram of a conventional offline AC uninterruptible power supply
220: DC-AC inverter 230: Charger
240: System switch
300: grid-connected off-line AC uninterruptible power supply of the present invention
320: DC-AC inverter 330: Charger
340: system switch 350: first voltage and phase detector
360: second voltage and phase detector 370:

Claims (12)

A first voltage and a phase detector for detecting a voltage magnitude and a phase of a power source input from the system;
A DC-AC conversion inverter for converting a DC voltage input from the battery into an AC voltage;
A system switch capable of outputting or interrupting a power input from the system; And
And a control unit for controlling operation of the DC-AC conversion inverter and the system switch. The method according to claim 1,
The uninterruptible power supply unit includes:
And a second voltage and phase detector for detecting an output voltage magnitude and phase of the uninterruptible power supply or the DC-AC conversion inverter. The method according to claim 1,
The uninterruptible power supply unit includes:
And a charger for charging the storage battery using a power source input from the system. 3. The method of claim 2,
Wherein,
And the information from the first voltage and phase detector and the information from the second voltage and phase detector is inputted to the grid-connected offline uninterruptible ac power supply. 5. The method of claim 4,
Wherein,
Wherein the DC-AC conversion inverter controls the DC-AC conversion inverter so that the DC-AC conversion inverter generates a voltage having the same phase and frequency as the power supplied from the system. 6. The method according to any one of claims 1 to 5,
Wherein,
Wherein the control unit controls the output voltage of the DC-AC conversion inverter to be smaller than the voltage magnitude of the power source inputted from the system while the system power is normally supplied. 6. The method according to any one of claims 1 to 5,
Wherein,
Wherein the controller controls the DC-AC conversion inverter to output a voltage of a standard voltage level of the system power source while the system power source is in the blackout state. 6. The method according to any one of claims 2 to 5,
Wherein,
And a control unit for comparing the phase of the voltage of the system power supply and the phase of the output voltage of the DC-AC conversion inverter when the system power supply is changed from the power-saving state to the power- And the voltage of the power source is controlled so as to coincide with the phase of the voltage of the power source. 9. The method of claim 8,
Wherein the matching of the voltage of the system by the control unit and the output voltage of the DC-AC conversion inverter is performed by changing the frequency of the output AC voltage of the DC-AC conversion inverter. Uninterrupted AC power supply. 9. The method of claim 8,
And the phase of the system voltage by the control unit and the output voltage of the DC-AC conversion inverter coincide with each other when the phase of the output AC voltage of the DC-AC conversion inverter is higher than the phase of the system voltage, And the frequency of the output AC voltage of the conversion inverter is lower than the frequency of the system voltage. 9. The method of claim 8,
And the phase of the system voltage by the control unit and the output voltage of the DC-AC conversion inverter coincide with each other when the phase of the output AC voltage of the DC-AC conversion inverter is slower than the phase of the system voltage, And the frequency of the output alternating-current voltage of the conversion inverter is controlled to be higher than the frequency of the system voltage. 10. The method of claim 9,
Wherein,
And turns on the system switch when the voltage of the system matches the phase of the output voltage of the DC-AC conversion inverter.
KR1020120143849A 2012-12-11 2012-12-11 Grid connected off line ac ups KR20140075472A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105634108A (en) * 2014-11-06 2016-06-01 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 Off-line type uninterrupted power source
US10291041B2 (en) 2015-12-02 2019-05-14 Samsung Electronics Co., Ltd. Power supply system having lithium battery
KR20200072961A (en) * 2015-05-28 2020-06-23 한성에스앤아이 주식회사 Uninterruptible power supply apparatus and method thereof
KR102162298B1 (en) * 2020-03-19 2020-10-06 주식회사 이온 Ups equipped with automatic switching function for 3 way operating modes based on line power source state
CN112673543A (en) * 2020-05-15 2021-04-16 华为技术有限公司 Uninterruptible power supply system and driving method thereof

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105634108A (en) * 2014-11-06 2016-06-01 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 Off-line type uninterrupted power source
CN105634108B (en) * 2014-11-06 2020-03-13 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 Off-line uninterrupted power supply
KR20200072961A (en) * 2015-05-28 2020-06-23 한성에스앤아이 주식회사 Uninterruptible power supply apparatus and method thereof
US10291041B2 (en) 2015-12-02 2019-05-14 Samsung Electronics Co., Ltd. Power supply system having lithium battery
KR102162298B1 (en) * 2020-03-19 2020-10-06 주식회사 이온 Ups equipped with automatic switching function for 3 way operating modes based on line power source state
CN112673543A (en) * 2020-05-15 2021-04-16 华为技术有限公司 Uninterruptible power supply system and driving method thereof
EP3961856A4 (en) * 2020-05-15 2022-07-20 Huawei Digital Power Technologies Co., Ltd. Uninterruptible power system and driving method therefor
JP2023501626A (en) * 2020-05-15 2023-01-18 ファーウェイ デジタル パワー テクノロジーズ カンパニー リミテッド Uninterruptible power supply and method for driving uninterruptible power supply
CN112673543B (en) * 2020-05-15 2023-12-29 华为数字能源技术有限公司 Uninterruptible power supply system and driving method thereof

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