Flexible DC power distribution network monopolar grounding fault identification and fault protection method

A flexible DC power distribution and single-pole ground fault technology, which is applied to the protection of fault current, fault location, emergency protection circuit devices, etc., can solve the problems of inability to accurately detect single-pole ground faults, and improve the reliability of power supply sex, the effect of rapid isolation

Active Publication Date: 2017-05-24
XUJI GRP +2
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Problems solved by technology

[0004] The purpose of the present invention is to provide a flexible DC distribution network unipolar ground fault identification

Method used

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  • Flexible DC power distribution network monopolar grounding fault identification and fault protection method
  • Flexible DC power distribution network monopolar grounding fault identification and fault protection method
  • Flexible DC power distribution network monopolar grounding fault identification and fault protection method

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Embodiment Construction

[0041] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0042] An embodiment of a single-pole ground fault protection method for a flexible DC distribution network of the present invention includes the following steps:

[0043] 1) Obtain the ground voltage of the positive and negative DC bus bars, and obtain the inter-electrode voltage change rate of the positive and negative DC bus bars;

[0044] 2) When the absolute value of the voltage change rate between the poles of the positive and negative DC bus bars is greater than the first comparison limit, the pulse width t 1 milliseconds, and the absolute value of the sum of the positive DC bus-to-ground voltage and the negative DC bus-to-ground voltage is greater than the second comparison limit, and when the duration greater than the second comparison limit exceeds the time limit, it is determined that the current A single-pole ground fault occurs...

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Abstract

The invention relates to a flexible DC power distribution network monopolar grounding fault identification and fault protection method. Positive and negative DC bus voltage to the ground is acquired, and the interpolar voltage change rate of positive and negative DC buses is acquired; and when the absolute value of the interpolar voltage change rate of the positive and negative DC buses is greater than a first comparison limit, pulse broadens t1 millisecond and the absolute value of the sum of the positive DC bus voltage to the ground and the negative DC bus voltage to the ground is greater than a second comparison limit and the time of duration exceeds a time limit, the judgment result indicates a monopolar grounding fault. According to the method, the monopolar grounding fault bus can be rapidly identified, and rapid isolation of the fault bus can be realized by tripping the DC circuit breaker of the grounding fault DC bus so as to enhance the power supply reliability of a DC power distribution network.

Description

technical field [0001] The invention belongs to the field of power electronics technology and DC power distribution, and in particular relates to a single-pole grounding fault identification and fault protection method of a flexible DC power distribution network. Background technique [0002] The multi-terminal flexible DC power distribution system refers to a flexible DC power distribution system composed of more than two VSCs (voltage source converters) under the same DC network frame, and the DC side of the converter port is connected to each other in parallel or in series. Compared with the traditional two-level or three-level VSC, the modular multilevel converter (MMC) has the advantages of easy expansion, small harmonic distortion, low switching loss, and strong fault handling ability, and has become a flexible DC distribution network. One of the preferred converter topologies. [0003] At present, the identification and elimination of DC single-pole ground faults are...

Claims

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Application Information

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IPC IPC(8): G01R31/02H02H7/26
CPCG01R31/52H02H7/268G01R19/12G01R31/086H02H3/16H02H3/445Y04S10/52
Inventor 张爱玲彭忠李少华李泰荆雪记周金萍苏匀赵静马小婷胡永昌苏进国李艳梅
Owner XUJI GRP
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