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Uninterruptible power supply device

A technology of a power supply device and a power supply unit, which is applied in the direction of battery circuit devices, circuit devices, emergency protection circuit devices, etc., and can solve problems such as disregard and inability to perform compensation actions

Pending Publication Date: 2022-01-07
NISSIN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the existing uninterruptible power supply device of the usual commercial power supply method, only the compensation action for instantaneous voltage drop and frequency variation can be performed on the load, and the compensation action for other system abnormalities cannot be performed.
Also, the consideration of system abnormalities is only for loads, but not for energy storage devices

Method used

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Experimental program
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Effect test

no. 1 approach ＞

[0055] Hereinafter, a first embodiment of an uninterruptible power supply device according to the present invention will be described with reference to the drawings.

[0056] The uninterruptible power supply device 100 of the first embodiment is as figure 1 As shown, it is a device of the normal commercial power supply method, which is installed between the commercial power system 10 and the important load 30 , and supplies power to the important load 30 when the commercial power system 10 is abnormal. Furthermore, in addition to the commercial power system 10 , the uninterruptible power supply device 100 may also be installed between the upper power supply side power system of the self-operated line and the important load 30 .

[0057] Here, the commercial power system 10 is a power supply network of a power company (supplier), and includes a power station, a power supply system, and a power distribution system. In addition, the important load 20 is a load for stably supplyi...

no. 2 approach ＞

[0088] Next, a second embodiment of the uninterruptible power supply device of the present invention will be described.

[0089] The uninterruptible power supply device of the second embodiment such as Image 6 As shown, the configuration of the control unit 6 and the operation of the power supply unit 2 are different from the above-described embodiments.

[0090] That is, in the control unit 6 of the second embodiment other than the above-described embodiments, at least one of the system abnormalities detected by the detection units 51 to 57 is a system smaller than the important load 30 or the power supply unit 2 . When the abnormality tolerance exceeds a predetermined threshold value, the power supply unit 2 performs a compensating operation for each system abnormality without turning off the disconnecting switch 3 .

[0091] refer to Figure 7 , the operation of the power supply unit 2 will be described together with the specific opening or closing control of the circuit...

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Abstract

Provided is an uninterruptible power supply device capable of responding to a variety of system abnormalities other than frequency fluctuation and voltage drop including instantaneous voltage drop. An uninterruptible power supply device 100 that is provided between a commercial power system 10 and an essential load 30 and that supplies AC power to the essential load 30, wherein the uninterruptible power supply device 100 is provided with: a power supply unit 2 that has an energy storage device 21 and is connected to a power line L1 for supplying power from the commercial power system 10 to the essential load 30; an open switch 3 for opening / closing the power supply line L1, the open switch 3 being provided on the power line L1 on the commercial-power-system side of the power supply unit 2; a system abnormality detection unit 5 for detecting a system abnormality, which is at least one of voltage rise, phase fluctuation, voltage imbalance, harmonic abnormality, and flicker, in addition to at least one of frequency fluctuation and voltage drop including instantaneous voltage drop, the system abnormality occurring on the commercial-power-system side of the open switch 3; and a control unit 6 that, when the detected system abnormality is equal to or greater than the tolerance of the essential load 30 or the power supply unit 2 against system abnormalities, opens the open switch 3 and supplies AC power from the power supply unit 2 to the essential load 30.

Description

technical field [0001] The invention relates to an uninterruptible power supply device in a usual commercial power supply mode. Background technique [0002] The uninterruptible power supply device of the usual commercial power supply method is a device for compensating for the instantaneous voltage drop or frequency fluctuation of the system voltage of the commercial power system. For example, as shown in Patent Document 1, the power supply unit is connected in parallel with the load. A switch is provided at an upper position, and the power supply unit includes a storage battery and a parallel inverter (inverter). Furthermore, when the system voltage of the commercial power system exceeds a predetermined allowable voltage range, the switch is turned off, and power is supplied to the load from the power storage unit as the energy storage device. [0003] However, in the existing uninterruptible power supply device of normal commercial power supply mode, only the compensatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06H02H7/18H02J3/32
CPCH02H3/50H02H3/46H02H3/48H02H3/253H02H3/20H02J9/062H02J2207/20H02H7/18H02J7/0029H02J7/0063H02J7/02
Inventor 西村荘治河崎吉则宇田怜史
Owner NISSIN ELECTRIC CO LTD