High-voltage direct current transmission line self-adaptive travelling wave protection method

A technology for traveling wave protection and transmission lines, which is applied to circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., and can solve problems such as traveling wave protection malfunctions

Inactive Publication Date: 2014-02-12
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When an external fault occurs, the protection measurement point can still measure a relatively high voltage change rate

Method used

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  • High-voltage direct current transmission line self-adaptive travelling wave protection method
  • High-voltage direct current transmission line self-adaptive travelling wave protection method
  • High-voltage direct current transmission line self-adaptive travelling wave protection method

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Embodiment Construction

[0061] Combine below figure 1 Specifically explaining this embodiment, the implementation method of adaptive traveling wave protection of HVDC transmission lines in this embodiment includes the following steps:

[0062] S1. Power on the relay protection device;

[0063] S2. Assign a value to the start-up value of traveling wave protection △ initial , the starting setting of traveling wave protection is the voltage change rate when the midpoint of the line is grounded with high resistance;

[0064] S3. Measure the local line voltage u, current i and opposite pole line current i op ;

[0065] S4. Calculate the local voltage change rate du / dt, the voltage change Du, the current change Di and the opposite current change Di op :

[0066]

[0067]

[0068] Assume Y ( X , T ) n = Y n - ...

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Abstract

The invention discloses a high-voltage direct current transmission line self-adaptive travelling wave protection method. The method includes the following steps that a relay protection device is powered on; a value is assigned to a travelling wave protection starting constant value delta initial; the voltage u and the current i of a pole line and the current iop of an antipole line are measured; the pole voltage change ratio du/dt, the pole voltage change amount Du, the pole current change amount Di and the antipole current change amount Diop are calculated; whether a starting criterion du/dt > delta initial is met or not is judged; the voltage ratio and relevant parameters are calculated; a voltage change ratio protection constant value delta r-set and a voltage change amount protection constant value delta v-set are calculated according to the voltage ratio; whether du/dtmax > delta r-set and Dumax > delta v-set are met or not is judged; whether on the rectification side, Dimax > Diop_max and Dimax > 0.1 or on the inversion side, Dimin < Diop_min and Dimin < -0.1 is met or not is judged; if yes, starting is protection. The method is high in sensitivity and antijamming capability, engineering realization is easy to achieve, faulty lines of direct current transmission lines can be rapidly determined, and the misjudgment phenomenon is not prone to occur.

Description

technical field [0001] The invention relates to the field of direct current transmission of power systems, in particular to a method for adaptive traveling wave protection of high-voltage direct current transmission lines. Background technique [0002] The actual transmission distance of HVDC transmission projects generally exceeds 1000km. Therefore, the transmission corridor environment is complex, and the probability of short circuit and lightning strike faults is extremely high. Actual operating experience shows that 90% of line faults are instantaneous faults. After the instantaneous fault line protection operates correctly, de-ionization and fault restart can be performed to restore the system operation. Therefore, as the main protection of DC line protection, traveling wave protection plays an important role in the stable operation of DC lines. [0003] The existing traveling wave protection of DC transmission lines can be divided into two technical routes: voltage tr...

Claims

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Application Information

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IPC IPC(8): H02H9/00
Inventor 郑伟周全张楠王钢李海锋武霁阳
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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