Controllable afterflow method and excitation system of magnetic controlled shunt reactor

An excitation system, magnetically controlled technology, applied in the direction of conversion equipment, electrical components, AC power input to AC power output, etc. that can be converted to DC without intermediate conversion, can solve problems such as high overvoltage, rectifier hazards, etc. Achieve the effect of reducing excitation current, convenient control and high reliability

Active Publication Date: 2009-01-14
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

When non-full-phase operation or three-phase trip occurs on the transmission line, high overvoltage may appear at both ends of the open triangle, causing damage to the rectifier

Method used

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  • Controllable afterflow method and excitation system of magnetic controlled shunt reactor
  • Controllable afterflow method and excitation system of magnetic controlled shunt reactor
  • Controllable afterflow method and excitation system of magnetic controlled shunt reactor

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Embodiment Construction

[0011] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0012] Such as figure 1 As shown, the controllable freewheeling branch of the magnetic control shunt reactor of the present invention is composed of thyristor valves connected in parallel at the two poles of the DC bus. The cathode of the thyristor valve is connected to the positive pole of the DC bus, and the anode is connected to the negative pole of the DC bus.

[0013] The controllable freewheeling method of the present invention includes: 1. When the rectifier is in a normal working state, block the trigger pulse of the thyristor valve of the controllable freewheeling branch, and the controllable freewheeling branch is not conducted; When all-phase operation or three-phase tripping occurs, the control circuit (which belongs to the existing mature technology) blocks the trigger pulse of the rectifier and triggers the thyristor valve of the contro...

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Abstract

The invention relates to magnet control type parallel reactor controllable afterflow method and excitation system. The present method comprises following steps: a controllable afterflow branch constituted by thyristor valve parallel to DC bus two pole is installed at magnet control type parallel reactor excitation system, the cathode of thyristor valve is connected with anode of DC bus, the anode of thyristor valve is connected with cathode of DC bus;when rectifier is under normal operation state, DC excitation current, rectifier and excitation branch constitutes loop, thyristor valve of controllable afterflow branch does not conduct; when open phase operation or three phase tripping of transmission line occurs, control circuit locks rectifier and triggers pulse and controllable afterflow branch thyristor valve, controllable afterflow branch conducts and DC exitation current transfers from rectifier to controllable afterflow branch to constitute loop, thyristor valves of rectifier totally shut off. The invention solves the technical problem of magnet control type parallel reactor excitation branch afterflow, which is significant to safety and reliable operation of magnet control type parallel reactor.

Description

technical field [0001] The invention relates to a controllable freewheeling method and system, in particular to a controllable freewheeling method and an excitation system for a magnetically controlled shunt reactor. Background technique [0002] In ultra-high voltage and ultra-high voltage power grids, controllable shunt reactors can effectively solve the contradiction between reactive power compensation and overvoltage limitation. The magnetically controlled shunt reactor controls the magnetic saturation degree of the iron core by changing the magnitude of the DC excitation current, so as to continuously, smoothly and quickly adjust its reactance value, so it has very superior control performance. [0003] The excitation winding of the magnetically controlled shunt reactor is located on the secondary side of the controllable shunt reactor body. The excitation winding is connected into an open triangle, and the two ends of the open triangle are respectively connected to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P13/00H02J3/38
Inventor 邓占锋崔大伟周飞雷晰王轩
Owner CHINA ELECTRIC POWER RES INST
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