Ultra-high voltage AC transformer phase selection, opening and closing control method and device

An ultra-high voltage AC and control method technology, applied in the direction of converting AC power input to AC power output, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., which can solve the complex calculation process and accurate calculation results. In order to achieve the effect of excitation inrush current suppression,
CN110535110AActive Publication Date: 2019-12-03ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +3
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
Publication Date
2019-12-03

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Abstract

The invention relates to the field of transformer intelligent control, in particular to an ultra-high voltage AC transformer phase selection, opening and closing control method and device. The methodcomprises the following steps: detecting the main control phase voltage of the ultra-high voltage AC transformer when receiving an opening command and controlling the three phases of the ultra-high voltage AC transformer to open according to the main control phase voltage, wherein the residual magnetic link of the ultra-high voltage AC transformer is close to or equal to zero after opening; and controlling the three phases of the ultra-high voltage AC transformer to close when receiving a closing command. The three-phase opening and closing of the ultra-high voltage AC transformer are controlled through one-phase voltage to realize that the residual magnetic link of the ultra-high voltage AC transformer is close to or equal to zero after the opening, and the ultra-high voltage AC transformer is controlled to close under the condition of zero residual magnetic link and thus the effect of suppressing the closing impact can be achieved.
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Description

technical field

[0001] The present disclosure relates to the field of intelligent control of transformers, in particular to a method and device for phase selection, opening and closing control of UHV AC transformers. Background technique

[0002] The UHV AC transformer is one of the core components in the UHV power grid. The UHV AC transformer phase selection opening and closing control method is a method of controlling the UHV AC transformer opening and / or closing using the phase selection control technology.

[0003] In the related art, in order to suppress the excitation inrush current generated when the UHV AC transformer is switched on, the UHV AC transformer phase selection opening and closing control method usually includes the following steps: the control device controls the UHV AC transformer to open at any opening time Finally, estimate the residual flux linkage of the UHV AC transformer. The control device determines the closing time according to the estimated re...

Claims

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