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Double-end direct-current power distribution network distributed region protection method based on current differential state quantity

A DC distribution network and area protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of IGBT and diode irreversible impact, fault current rise, high amplitude, etc., to reduce the scope of fault power outage, strong applicability , The effect of short transmission distance

Active Publication Date: 2020-02-14
SOUTHEAST UNIV +2
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Problems solved by technology

[0003] Purpose of the invention: The purpose of the invention is to solve the problem that the fault current rises rapidly after a short circuit between poles occurs in the DC distribution network, and the amplitude is high, causing irreversible impacts on IGBTs and diodes, and the problems of large-scale power outages caused by traditional protection schemes

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  • Double-end direct-current power distribution network distributed region protection method based on current differential state quantity
  • Double-end direct-current power distribution network distributed region protection method based on current differential state quantity
  • Double-end direct-current power distribution network distributed region protection method based on current differential state quantity

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0032] The present invention proposes a distributed area protection method for double-terminal DC distribution network based on current differential state quantity, which is applicable to double-terminal or multi-terminal DC distribution network under various operating modes. The multi-terminal DC distribution network is taken as an example to illustrate.

[0033] figure 1 It is a double-terminal DC distribution network model, and its AC connection transformer adopts th...

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Abstract

The invention discloses a double-end direct-current power distribution network distributed region protection method based on a current differential state quantity. Firstly, a medium-voltage direct-current bus is used as a boundary to carry out region division on a medium-voltage direct-current line; direct-current voltage and current amplitudes are used as fault characteristic quantities of protection starting, state word definition is carried out on a fault current differential quantity, fault type judgment and region fault positioning are carried out by utilizing the distribution condition of fault current state words, and direct-current circuit breakers at the two ends of a fault region are rapidly disconnected. Only information communication of adjacent sensors is needed, communicationdata are few, the transmission distance is short, faults can be rapidly removed when single-pole short circuit and double-pole short circuit happen to a direct-current line, the applicability is high, and the method can be used for a double-end or multi-end direct-current power distribution network in various operation modes.

Description

technical field [0001] The invention belongs to the field of relay protection for DC distribution networks, and relates to a distributed area protection method for double-terminal DC distribution networks based on current differential state quantities. Background technique [0002] In recent years, with the development of power electronics technology, DC distribution network has become an important development direction of future urban intelligent power distribution due to its advantages such as small output harmonics, large power supply capacity, high reliability, and easy access to distributed power sources. Different from the AC distribution network, when the DC distribution network fails, the fault characteristic quantity presents the characteristics of aperiodicity, nonlinearity, and fast change speed. In terms of protection quickness, the DC distribution network is higher than the AC distribution network. After a short-circuit fault between poles, the DC side capacitor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/268H02H7/262H02H7/263
Inventor 吕家乐陈庆窦晓波王璐瑶杨景刚肖小龙苏伟吴在军
Owner SOUTHEAST UNIV
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