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A hybrid fault location method and device for distribution network based on PMU

A technology of fault location and distribution network, applied in the directions of fault location, fault detection by conductor type, system integration technology, etc., to achieve the effect of high precision and high fault location.

Inactive Publication Date: 2019-02-15
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of the above methods can achieve high-precision fault location under various uncertain factors such as different short-circuit fault types, fault resistance, and fault distance.

Method used

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  • A hybrid fault location method and device for distribution network based on PMU
  • A hybrid fault location method and device for distribution network based on PMU
  • A hybrid fault location method and device for distribution network based on PMU

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Embodiment Construction

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] Embodiments of the invention: figure 1 It is a structural diagram of a 10KV power distribution system. BRK represents the outlet circuit breaker of the substation, S1~S4 represent the subsection switches equipped with feeder terminal units (FTU) on the main line, and S5~S7 represent subsections without feeder terminal units (FTU) on the branch feeders. Section switches, FI1~FI3 represent the fault indicator (FI) installed at the head end of the distribution feeder, and a synchronized phasor measurement unit (PMU) is installed at the substation and the end of the main feeder, and the substation is used as an information processing substation. PMU1 and PMU2 provide a second pulse signal and a time tag through the GPS receiver. The time can be...

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Abstract

The invention discloses a power distribution network mixed fault range finding method and device based on PMUs. The device is provided with an information processing substation in a transformer station; each section switch on a main trunk is provided with an FTU; the first terminal of each branch line is provided with an FI; meanwhile the transformer station and the rear end of the main trunk are both provided with a PUM; the PMUs on two sides both perform real-time communication with a satellite perform through a GPS receiver, and transmit electric quantity information before and after faults to the information processing substation in real time; the FTU and the FI are in connection with a transformer substation through a radio communication channel. Based on a mode of firstly determining a segment and secondly performing distance finding, the device and method perform accurate fault range finding of a power distribution network by employing a PMU-based mixed fault range finding method, i.e., the combination of a PMU-based double-ended synchronization phasor method and a single-ended impedance method, thereby eliminating pseudo fault points and realizing high precision fault range finding.

Description

technical field [0001] The invention relates to a PMU-based hybrid fault distance measurement method and device for a power distribution network, and belongs to the technical field of power grid fault distance measurement. Background technique [0002] In 2011, the research on major smart grid projects deployed by the Ministry of Science and Technology in the field of advanced energy technology in the National High-tech Research and Development Program (863 Program) was fully launched. As an important part of the smart grid, the smart distribution network is the source and power to promote the development of the smart grid, and it is also a key technical field for the construction of the smart grid. The typical feature of smart distribution network operation control is to realize self-healing control. One of the key technologies of smart distribution network self-healing control is to realize fault location, network reconfiguration and power supply recovery under fault condi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086Y02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 刘永军刘敏周伟余辛印然
Owner GUIZHOU UNIV
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