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Traveling-wave differential protection method suitable for series capacitor compensation circuit

A series capacitor compensation and differential protection technology, applied in the field of traveling wave differential protection scheme, can solve the problem that the traveling wave differential scheme cannot be directly applied to series compensation lines, etc., and achieve high sensitivity, strong practicability, and good phase selection tripping effect of ability

Active Publication Date: 2011-06-08
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] The series compensation line is no longer a uniform transmission line as a whole, and the traditional traveling wave differential scheme cannot be directly applied to the series compensation line

Method used

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  • Traveling-wave differential protection method suitable for series capacitor compensation circuit
  • Traveling-wave differential protection method suitable for series capacitor compensation circuit
  • Traveling-wave differential protection method suitable for series capacitor compensation circuit

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Embodiment Construction

[0021] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0022] The traveling wave differential protection method applicable to the series capacitor compensation circuit of the present invention includes the following steps:

[0023] (1) After the protection is activated, start to calculate the current of each mode flowing into the series capacitor compensation device from both sides of the line. Let the three-phase current and voltage sampled by the protection on this side be i m a , I m b , I m c And u m a , U m b , U m c , Using the phase-to-mode conversion method to convert the current and voltage of each phase to the current i in each mode domain m x And voltage u m x , X=0, α, β represent each mode component. The phase-to-mode conversion can use the Karenbull conversion; the current i in each mode domain can also be obtained according to the current and voltage of each phase on the opposite side n x And v...

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Abstract

The invention discloses a traveling-wave differential protection method suitable for a series capacitor compensation circuit. The method comprises the steps: 1) current calculation under a mold domain, calculating mold currents im<x> and in<x> flowing into a series capacitor device from onside and offside; 2) establishment of differential equation; 3) resolution of differential currents, utilizing the reverse transformation of phase molds to solve vectors icd<phi> of the differential currents of each fault phase and each non-fault phase; 4) action judgment of a differential relay: utilizing the fault-phase action amount as braking, and adding an appropriate fixing threshold. The invention can effectively solve the effect of capacitor current on differential protection of long-distance transmission lines, can be well suitable for the series capacitor compensation circuit, and enhances the sensitivity of differential protection.

Description

Technical field [0001] The invention relates to a traveling wave differential protection scheme suitable for series capacitor compensation lines, and belongs to the technical field of power system automation. Background technique [0002] Series capacitance compensation is an effective means to improve the economy and reliability of the transmission system. Its main function is to improve the transmission capacity of the power system by controlling the power flow; improve the stability of the power system; improve the voltage quality and reactive power balance; reduce the line loss of the system, increase the line transmission capacity, and improve the transient stability of the system , Optimize the role of power transmission line flow. [0003] The series compensation capacitor changes the uniformity of the transmission line impedance and brings many problems to the longitudinal protection and distance protection. The longitudinal current differential protection is basically not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/14
Inventor 钱国明陈福锋
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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