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Double-power-supply switching device control method for inhibiting magnetizing inrush current of load transformer

A technology of dual power switching and excitation inrush current, which is applied in the direction of circuit devices, emergency power supply arrangements, AC network circuits, etc., can solve problems such as excitation inrush current, achieve the effect of eliminating excitation inrush current and increasing power outage time

Pending Publication Date: 2021-04-13
WUHAN SECOND SHIP DESIGN & RES INST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] And when the backup power supply is an energy storage device, when there is a load transformer on the load side, a serious excitation inrush current phenomenon will also occur during the switching process

Method used

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  • Double-power-supply switching device control method for inhibiting magnetizing inrush current of load transformer
  • Double-power-supply switching device control method for inhibiting magnetizing inrush current of load transformer
  • Double-power-supply switching device control method for inhibiting magnetizing inrush current of load transformer

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Embodiment Construction

[0042] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0043] Such as figure 1 Shown is a dual power supply circuit (or switching device) applied to the present invention, which includes a first branch and a second branch, the first branch is connected to a grid power supply, such as a three-phase 10kV grid power supply, grid power supply The switching control is carried out through the common power switch, and the second branch is connected to the battery, the inverter and the backup power switch.

[0044] Under normal circumstances, in order to save costs, each backup branch should provide backup power supply support for multiple normal power supply branches, such as Figure 10 As shown, that is, the storage battery and the inverter should be connected in parallel with the independent grid power supply of different power ...

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Abstract

The invention discloses a double-power-supply switching device control method for inhibiting magnetizing inrush current of a load transformer. The control method is used for switching control of a double-power-supply switching device. The method comprises the following steps of (1) monitoring a power grid power supply, (2) judging whether the power grid power supply has a fault or not, (3) if the power grid power supply fails, stopping the driving signal of the frequently-used power supply switch, (4) detecting whether the frequently-used power switch is turned off or not, and (5) when the frequently-used power supply switch is turned off, turning on the standby power supply switch.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a control method for a dual power supply switching device for suppressing the excitation inrush current of a load transformer. Background technique [0002] As energy storage devices are more and more widely used in power grids, dual power switching devices are not limited to using grid power as a backup power source. The backup power supply adopts the energy storage device, firstly, it can avoid the situation that the two power grids are cut off at the same time and the load has to be powered off, and it can control the quality of the power generated by the energy storage device, so as to ensure that the load can have higher quality power supply. [0003] However, when the backup power source is an energy storage device and there is a load transformer on the load side, a serious excitation inrush current phenomenon will also occur during the switching process. For the above p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06H02J3/00
CPCH02J9/062H02J3/0073Y04S20/20Y02B70/30
Inventor 何宇邢小平于帅鄢伦雷秉霖汪永茂田杰耿攀陈涛罗伟魏华
Owner WUHAN SECOND SHIP DESIGN & RES INST
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