Impedance switching device

A single-resistance technology, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems such as safe operation of unfavorable devices, sudden changes in current on grid system impedance, etc.

Inactive Publication Date: 2014-01-22
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the switch is turned off, this structure will cause a sudden change in the current on the impedance of the grid system, thereby generating overvoltage on the rectifier bridge, which is not conducive to the safe operation of the device

Method used

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] image 3 It is the topology structure of Embodiment 1 of the present invention, which is used for single-phase power connection lines. Such as image 3 As shown, the structure of Embodiment 1 of the present invention is as follows: the first switch S1, the second switch S2, the first diode D1 and the second diode D2 form a controllable bridge CB; the first switch S1 and the second switch S2 The anodes of the first diode D1 and the second diode D2 are connected together to form the first DC connection point PD1, the anodes of the first diode D1 and the second diode D2 are connected together to form the second DC connection point PD2, the cathode of the first switch S1 and the second The cathodes of a diode D1 are connected together to form the first AC connection point PA1, the cathodes of the second switch S2 and the cathodes of the se...

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PUM

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Abstract

The invention discloses an impedance switching device. In a bypass state, the impedance switching device presents an almost unimpeded path for a connected circuit without producing any influence on the circuit, and can switch required impedance to the circuit safely and reliably to change the impedance of the circuit when the impedance of the circuit is required to be changed. The impedance switching device is mainly applied to grid power flow control and fault current limitation.

Description

technical field [0001] The invention relates to an impedance switching device. Background technique [0002] Power flow control and fault current limiting are two core technical problems faced by the transmission network. Both power flow control and fault current limiting generally require changing the equivalent impedance of grid current limiting, such as figure 1 The U.S. patent US00542495 "power flow control of transmission lines" shown in the figure, realizes switching of capacitors through thyristors. Due to the use of thyristors, the response speed of this method is slow, and the inductance of the thyristor branch is easily connected in parallel with the switched capacitors. Resonance is not conducive to the safe operation of the device. figure 2 It is a topological structure diagram of Chinese patent CN100452608C "bridge-type short-circuit fault current limiting device with a single self-switch". This patent adopts a structure in which a current-limiting inductor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02H02H9/04
Inventor 郭文勇肖立业戴少涛张志丰
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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