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A series capacitance compensation line distance protection method combined with a phase comparison relay

A technology of series capacitor compensation and phase relay, applied in reactive power compensation, emergency protection circuit devices, reactive power adjustment/elimination/compensation, etc., can solve the problems of low protection sensitivity, no sensitivity, insufficient sensitivity, etc., to improve sensitivity , high reliability, easy to achieve effect

Active Publication Date: 2011-12-14
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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AI Technical Summary

Problems solved by technology

One is to avoid the impedance setting value of the distance I section, that is, consider the capacitance reactance ZC of the series compensation capacitor when setting, and set it according to the sum of the line impedance ZL and the capacitance reactance of the series compensation capacitor (ZL-j|ZC|), When the series compensation capacity is large, the protection sensitivity may be very low, or even have no sensitivity; second, the level detection scheme, that is, assuming that the voltage on the series compensation capacitor is always at its overvoltage protection level, the failure before the series compensation capacitor or in the series There is still a problem of insufficient sensitivity of the distance protection when the capacitor is faulty and the series capacitor is bypassed by the air gap
Therefore, the distance protection in the current series capacitor compensation line protection is often withdrawn

Method used

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  • A series capacitance compensation line distance protection method combined with a phase comparison relay
  • A series capacitance compensation line distance protection method combined with a phase comparison relay
  • A series capacitance compensation line distance protection method combined with a phase comparison relay

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Embodiment Construction

[0012] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments.

[0013] When the distance protection of the line is activated, start to calculate the compensation voltage

[0014] U · S = U · m - I · m - Z l - - - ( 1 )

[0015] in and are the voltage and current at the protection installation, respectively. in and are the voltage and current of the fault circuit measured at the protection installation, respectively. If it is a phase-to-phase fault, taking BC fault as an example, That is, the phase-to-phase voltage between phases B and C, is the curre...

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Abstract

The invention discloses a novel series capacitor compensation line distance protection method combined with a phase-comparison relay. Compensation voltage is calculated from the current and voltage value at the protection installation. 2) Phase comparison relay action discrimination: compare the phase according to the calculated compensation voltage and the corresponding positive sequence voltage at the protection installation; 3) Protection logic: if the phase comparison relay operates, then Directly open distance protection without any anti-overrunning measures; if the phase comparison relay fails to operate, it will be put into level detection logic. The invention improves the sensitivity of the distance protection on the basis of reliably preventing overrunning. When the compensation capacitor is installed at the end of the line, the sensitivity of the distance protection is basically not affected by the compensation capacitor, has high reliability and is easy to realize.

Description

technical field [0001] The invention relates to a novel series capacitance compensation line distance protection method combined with a phase-comparison relay, which belongs to the technical field of power system automation. Background technique [0002] Series capacitor compensation is an effective means to improve the economy and reliability of 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 transmission capacity of the line, and also improve the transient stability of the system , Optimizing the power flow of transmission lines. [0003] However, the series compensation capacitor destroys the uniformity of the transmission line impedance, which brings great difficulties to the design of series capacitor compensation line protection, especially ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02J3/18
CPCY02E40/30
Inventor 陈福锋钱国明
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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