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Method, device and system for controlling and protecting serial capacitors

A series capacitor, control and protection technology, used in emergency protection circuit devices, electrical components, etc., can solve problems such as economic loss, current protection misoperation, and refusal to operate, and achieve the effect of improving reliability and safety.

Active Publication Date: 2011-11-16
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since every unreliable current signal sent to the control and protection system will cause the relevant current protection to malfunction or refuse to operate, thus affecting the reliability and safety of the series compensation device protection and causing unnecessary economic losses

Method used

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  • Method, device and system for controlling and protecting serial capacitors
  • Method, device and system for controlling and protecting serial capacitors
  • Method, device and system for controlling and protecting serial capacitors

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Embodiment Construction

[0034] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated.

[0035] figure 1 It is a flow chart of an embodiment of the control and protection method of the series capacitor device of the present invention. Wherein in this embodiment, the series capacitor device includes a plurality of shared node branches, and each shared node branch in the plurality of shared node branches is respectively provided with a current transformer, which is used to control the current transformer on the shared node branch. Current signals are measured, and the plurality of common node branches include bypass breaker branches. Such as figure 1 As shown, the control and protection method of the series capacitor device in this embodiment is as follows:

[0036] Step 101, receiving current signals in multiple common node branches measured by each current transformer at the same sa...

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Abstract

The invention discloses a method, device and system for controlling and protecting serial capacitors. The serial capacitors comprise a plurality of shared node branches, wherein each branch among the plurality of shared node branches is provided with one current transformer which is used for measuring current signals on the branch; and the plurality of shared node branches comprise bypass breaker branches. The method comprises the following steps: receiving current signals which are measured by each current transformer in the plurality of shared node branches at the same sampling time; identifying whether the current signals in the plurality of shared node branches meet the KCL (Kirchhoff's current law); and determining the current signals in the plurality of shared node branches to be incredible when the current signals in the plurality of shared node branches do not meet the KCL, thus locking the current protection of the serial capacitors. The current signals in the plurality of shared node branches in the serial capacitors are judged to be incredible exactly, thus improving the reliability and safety of protection of the serial capacitors.

Description

technical field [0001] The invention relates to an AC power transmission system, in particular to a control and protection method, device and system for a series capacitor device. Background technique [0002] The series capacitor compensation technology (referred to as: series compensation) of the AC transmission system is to connect the power capacitor in series in the AC transmission line to compensate the partial inductive impedance of the AC transmission line, so as to increase the transmission capacity of the line, improve the stability of the system, and save investment. etc. purpose. In long-distance and large-capacity power transmission systems, as the transmission distance increases, its transmission capacity is increasingly limited, and series compensation is one of the important means to solve this problem and improve the power transmission capacity of EHV / UHV transmission lines. One, so it has very huge economic value. At present, series compensation technolog...

Claims

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Application Information

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IPC IPC(8): H02H7/16
CPCH02H7/16
Inventor 戴朝波李锦屏武守远王宇红
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD