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Method for protecting transient state energy of DC power transmission line

A DC transmission line, transient protection technology, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as insufficient sensitivity, unreliable line protection, and incorrect action of DC transmission line traveling wave protection

Inactive Publication Date: 2012-05-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, existing traveling wave protection is susceptible to interference from transient phenomena such as lightning, commutation failure, and AC side faults, making line protection unreliable
, and there is also insufficient sensitivity when the line is grounded with high impedance
In addition, in actual engineering, it sometimes happens that the traveling wave protection action of DC transmission line does not operate correctly

Method used

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  • Method for protecting transient state energy of DC power transmission line
  • Method for protecting transient state energy of DC power transmission line
  • Method for protecting transient state energy of DC power transmission line

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Embodiment

[0020] figure 1 Shown is the ±800kV UHVDC transmission system model. In this model, the power transmission capacity is 5000MW, the reactive power compensation capacity of the rectification side and the inverter side are 3000MVAr and 3040MVAr respectively; control and alpha min The limit is composed of two parts. The inverter side is equipped with constant current control and constant turn-off angle control. In addition, both sides are equipped with low-voltage current limiting (VDCOL) control, and the inverter side is also equipped with current deviation control (CEC); two-pole DC line L1 and L2 are six-split conductors with a designed power transmission distance of 1438km; 300mH smoothing reactors L are installed on both sides of the line S ;DC filter F dc For 12 / 24 double tuned filter. right figure 1 The UHV DC transmission system shown, the transient energy protection method of the DC transmission line, includes the following steps:

[0021] Step 1: Collect the inst...

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Abstract

The invention provides a method for protecting transient state energy of a DC power transmission line. .The corresponding energy transmission characteristics of the line are different under various operating rated load conditions and failure conditions and the obvious differentiation characteristics on the low-frequency transmitted energy are possessed for the DC line. Based on the principle and the low-frequency transient state break variable energy of the DC power transmission line, the method realizes the identification of failures in a region and the protection, has absolute selectivity, is free of lightning strike interference and influences of electromagnetic coupling of lines of both poles and commutation failure, and in case of grounding failure with high resistance, the enough sensibility is still possessed.

Description

technical field [0001] The invention relates to the protection technology of direct current transmission lines, in particular to a method for utilizing the low-frequency transient mutation energy of the direct current transmission line to realize the identification of faults in the area for protection. Background technique [0002] my country has a vast territory. With the rapid development of economic construction, long-distance power transmission across regions has become inevitable. Compared with AC transmission, DC transmission is more suitable for long-distance high-power transmission system. Therefore, in recent years, my country has greatly accelerated the construction of DC transmission projects. The direct current transmission system can realize fast and multi-mode regulation, which plays a very important role in the safe operation of the entire AC and direct current system. As one of the main components of the DC transmission system, the DC transmission line has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 王钢李海锋罗建斌
Owner SOUTH CHINA UNIV OF TECH
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