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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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  • 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 and calculating the differential value of voltage and current, and overcomes the problem of using a single temporary State information detects defects with low fault reliability; without synchronization, the reliability and rapidity of fault discrimination are high

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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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Embodiment Construction

[0026] Such as figure 1 As shown, in this embodiment, the shunt at the entrance of the DC line and the current transformer of the capacitor branch in the flexible DC transmission system are used as the fault discrimination measurement points, and the currents at the entrances of the pole 1 and pole 2 lines on the rectification 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 middle 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 parallel capacitor on the DC side and the converter, and E, F are located at the connection line between the rectifier side and the inverter side. At the AC commut...

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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...

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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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