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Fault detection method for direct current power distribution network

A DC distribution network and fault detection technology, which is applied to the fault location, detects faults according to conductor types, and measures electricity. It can solve the problems of insufficient relay protection and fault location of flexible DC distribution networks, and achieve simplified and complex detection. performance, improve accuracy, and improve the effect of detection accuracy

Inactive Publication Date: 2019-11-19
XI AN JIAOTONG UNIV +2
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The application of VSC to the power distribution system of medium and low voltage levels-flexible DC distribution network has become a new research hotspot. my country has established a demonstration project of flexible DC distribution network in Shenzhen, but for the relay protection and protection of flexible DC distribution network Fault location is not enough

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  • Fault detection method for direct current power distribution network
  • Fault detection method for direct current power distribution network
  • Fault detection method for direct current power distribution network

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Embodiment Construction

[0032] Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and is not limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0033] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art should understand that they may use different terms to refer to the same component. The specification and claims do not use differences in nouns as a way of distinguishing components, but use differences in functions of components as a criterion for distinguishing. "Includes" or "comprises" mentioned throughout the spe...

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Abstract

The invention discloses a fault detection method for a direct current power distribution network. The method includes the following steps: voltage and current of positive and negative poles of an rectifier side M and an inverter side N of the direct current power distribution network, modal voltage and modal current are obtained based on the voltage and current, a derivative of the modal voltage based on the modal voltage, equivalent capacitance values of two sides are recognized based on the derivative of the modal voltage, a sampling point is determined when capacitance starts to stabilize,a first point where a modal recognition capacitance value that satisfies a stability interval calculated from continuous multiple points is the sampling point of the capacitance starting to stabilize,the arrival time of traveling waves on both sides is determined, wherein a m-th sampling point on the M side is a point where the capacitance starts to stabilize, then the time when the M-side traveling wave head arrives is the time corresponding to the m sampling point, a n-th sampling point on the N side is the point where the capacitance starts to stabilize, the time when the N-side travelingwave head arrives is the time corresponding to the n sampling point, and the fault distance is positioned based on the time when the traveling waves on the both sides arrive.

Description

technical field [0001] The invention belongs to the technical field of direct current distribution networks, in particular to a fault detection method for direct current distribution networks. Background technique [0002] The power supply and load of the power system are changing. With the increase of new energy penetration rate, the development of power electronic technology and the rapid growth of DC load, the power grid connecting the power supply and load is developing in the direction of DC. Flexible DC power transmission and distribution technology is based on a new type of turn-off switching element and modulation technology, which can decouple active power and reactive power. It has many advantages such as power supply, suitable for asynchronous networking and multi-terminal DC transmission system. At the same time, it has a high application prospect in the fields of new energy grid connection, urban power supply, island power supply, and AC-DC hybrid transmission. ...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 宋国兵张晨浩刘健彭书涛豆敏娜万青陈洁羽
Owner XI AN JIAOTONG UNIV
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