unbalanced protection method for TCR circuit

A technology of thyristor control and reactor, applied in the direction of automatic disconnection emergency protection device, circuit device, emergency protection circuit device, etc., can solve problems such as system malfunction, three-phase current imbalance, system protection calculation error, etc., to achieve Preserve the effect of accurate and simple structure

Inactive Publication Date: 2009-06-03
BEIJING ARITIME INTELLIGENT CONTROL
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  • Abstract
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AI Technical Summary

Problems solved by technology

instead take as figure 1 According to the acquisition method shown, according to the results of AD sampling, there are the following difficulties in directly judging whether the three-phase current is balanced: (1) The current distortion of the thyristor-controlled reactor circuit in the triangular area is large and contains a large number of characteristic harmonics. The amplitude of the harmonic is the largest, and there is a sampling error when the current AD is sampled; (2) In the case of three-phase unbalanced grid voltage, reactor manufacturing error, trigger pulse error, etc., the system may also have three-phase current unbalanced Happening
The above-mentioned problems will inevitably cause errors in system protection calculations, which may lead to system malfunctions and reduce the safety and reliability of the system.

Method used

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  • unbalanced protection method for TCR circuit
  • unbalanced protection method for TCR circuit
  • unbalanced protection method for TCR circuit

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Embodiment Construction

[0013] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments, but it is not intended to limit the present invention.

[0014] The load of the thyristor-controlled reactor circuit is inductive, and the current lags the voltage by 90 degrees under ideal conditions. When working in a balanced state, the thyristor adjusts the size of the reactor current. The current is mainly the inductive current of the lagging voltage, and there is a small amount of resistive current in the circuit. The measured power value is mainly reactive power, and the active power value is very large. small. When working in an unbalanced state, the three-phase current not only has an unbalanced difference in amplitude, but also the angle between the current and voltage changes, the calculated value of active power increases significantly, and the calculated value of reactive power decreases. The ratio of active power is significantly ...

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Abstract

The method uses ratio of three phase reactive power to three phase active power to judge three phase balance state of system. TCR current is taken from phase current out of trigon.

Description

technical field [0001] The invention relates to an unbalance protection method for a thyristor-controlled reactor (TCR) circuit, in particular to an unbalance protection method for a thyristor-controlled reactor circuit used in medium-voltage power grid governance. Background technique [0002] In the technical scheme of medium-voltage power grid governance, the thyristor-controlled reactor circuit is the most used, and the structure of the circuit is a delta connection. In order to ensure the reliable operation of the thyristor control reactor, it is necessary to have a complete protection function. One of the important protection monitoring items is: when the load is balanced, it is necessary to detect the unbalanced state of the thyristor controlled reactor. The occurrence of this unbalanced state , may be caused by loss of trigger pulse, high voltage breakdown of thyristor valve string, partial damage of reactor and other reasons. Once there is an unbalanced state, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/38H02H7/00
Inventor 杨建宁王俭祝瑾
Owner BEIJING ARITIME INTELLIGENT CONTROL
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