Flexible high-voltage DC line protection method with current correlation

A high-voltage direct current and line protection technology, applied in the field of power system, can solve the problems of high reliability and rapidity of fault identification, low fault reliability, etc. Effect

Active Publication Date: 2016-08-24
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a current-dependent flexible high-voltage DC line protection method, which calculates the full current signal without compensating the distributed capacitive current

Method used

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  • Flexible high-voltage DC line protection method with current correlation
  • Flexible high-voltage DC line protection method with current correlation
  • Flexible high-voltage DC line protection method with current correlation

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Example Embodiment

[0026] Such as figure 1 As shown, in this embodiment, the current transformer at the entrance of the DC line in the flexible DC transmission system and the current transformer of the capacitor branch are used as fault identification measurement points, and the currents at the entrance of the pole 1 and pole 2 line of the rectifier side and the parallel capacitor branch are collected in real time. i Cable1_r , I C1_r , I Cable2_r , I C2_r And the current i at the entrance of the inverter side line and the parallel capacitor branch Cable1_i , I C1_i , I Cable2_1 , I C2_i , Where: the positive direction of the current is set to figure 1 In the direction indicated by the arrow, M, N, E, and F respectively indicate the location of the fault point outside the DC line area. M, N are located at the connection line between the DC side shunt capacitor and the converter, and E and F are located between the rectifier side and the inverter side. At the AC converter bus.

[0027] When t...

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Abstract

The invention discloses a flexible high-voltage DC line protection method with current correlation. Through sampling current of DC-side shunt capacitor branches and a DC line entry, Pearson correlation coefficients of current of capacitor branches at two sides of the DC system and current at the DC line entry are calculated respectively, calculated correlation coefficients at two sides are finally compared, and thus, DC line fault discrimination is realized. The protection method is simple in operation, the needed sampling frequency is low, the method is not influenced by factors such as data synchronization, a fault type, a fault position, noise interference and a control mode, inner and outer faults in the DC line area can be accurately recognized, and a fault line is protected. The protection method plays an important role in safety operation of the flexible high-voltage DC transmission system.

Description

technical field [0001] The invention relates to a technology in the field of electric power systems, in particular to a current-dependent flexible high-voltage direct current line protection method. Background technique [0002] The flexible direct current transmission system (VSC-HVDC) based on the voltage source converter has the characteristics of independently adjusting active and reactive power, and can supply power to the passive network, which overcomes the essential defects of traditional high-voltage direct current transmission (HVDC), so It is widely used in the field of long-distance transmission of large-scale renewable energy. However, compared with the traditional HVDC transmission system, the flexible DC system lacks the low-voltage current limiting function and mature DC switching devices, and the fault identification and troubleshooting of the DC line has become one of the main factors limiting the development of the flexible DC transmission system. [0003...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/085Y04S10/52
Inventor 刘剑邰能灵范春菊杨亚宇陈实
Owner SHANGHAI JIAO TONG UNIV
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