New type series compensated line subsynchronous resonance damping and short-circuit current limiting device

A short-circuit current limiting, subsynchronous resonance technology, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc.

Inactive Publication Date: 2014-03-26
HARBIN PATEERN SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a novel series-compensated line sub-synchronous resonance damping and short-circuit current limiting device using switching transformer technology to solve the above-mentioned low reliability , the problem of poor practicality

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  • New type series compensated line subsynchronous resonance damping and short-circuit current limiting device
  • New type series compensated line subsynchronous resonance damping and short-circuit current limiting device

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Embodiment Construction

[0018] A new type of sub-synchronous resonance damping and short-circuit current limiting device for series-compensated lines using switching transformer TK technology such as figure 1 Shown: including operating circuit breaker K1, series compensation capacitor C, current-limiting reactor L, overvoltage suppressor ZnO, bypass switch K4, switching transformer TK, thyristor SCR, isolation switches K2 and K3; the switching transformer TK original The left end of the side winding is connected to the isolating switch K2, and the right end of the primary winding of the switching transformer TK is connected to the isolating switch K3; the two ends of each single-phase winding of the switching transformer TK are connected with two positive and negative parallel thyristors SCR; two isolating switches The other ends of K2 and K3 are respectively connected to the two ends of the series compensation capacitor C; the overvoltage suppressor ZnO and the bypass switch K4 are also connected to...

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Abstract

The invention relates to a new type series compensated line subsynchronous resonance damping and short-circuit current limiting device adopting the switch transformer technology, and pertains to the technical field of power electronics, wherein the reliability and practicability of the circuit can be greatly improved by adopting the switch transformer technology. According to the device, the series capacitor compensation function can be realized when the power supply line is in normal conditions to improve the system transmission capacity; and the subsynchronous resonance damping function can be realized when the line is in subsynchronous resonance conditions, and the short-circuit current limiting function can be realized when the line is in short-circuit failure conditions to make the series compensated line electric transmission line operate stably and reliably.

Description

technical field [0001] The invention relates to a novel sub-synchronous resonance damping and short-circuit current limiting device for series-compensated lines, which belongs to the technical field of power electronics. The effect of limiting the short-circuit current makes the series compensation circuit more practical and reliable. Background technique [0002] 1. The inductive reactance of the long-distance transmission line is relatively large, and the voltage drop of the inductive reactance reduces the terminal voltage of the line, which affects the transmission capacity. The series capacitor compensation can offset the influence of the line inductive reactance, increase the transmission capacity, and reduce voltage fluctuations. Fixed capacitor series compensation has been used for a long time, but fixed series compensation will cause sub-synchronous resonance, which will damage the shafting of the generator. [0003] The sub-synchronous resonance is produced by the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02H9/02
Inventor 潘政春李天昊
Owner HARBIN PATEERN SCI & TECH
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