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Active power distribution network fault positioning method based on feeder line marking method and impedance method

A technology of distribution network fault and location method, which is applied to the fault location, detects faults by conductor type, and measures electricity. effect, the effect of reducing the time of voltage and current

Active Publication Date: 2021-10-01
YANGZHOU DEYUN ELECTRICAL EQUIP GRP CO LTD
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the existing technology that the distribution network feeder section is easily affected by distortion information when it relies solely on the matrix algorithm for positioning, and is easily affected by factors such as transition resistance and line branches when relying solely on the impedance method, it is prone to false fault points. The invention provides an active distribution network fault location method based on the feeder marking method-impedance method, which can avoid the location error phenomenon caused by the existence of distortion information, and also avoid the time-consuming location of the fault point and the location of multiple pseudo-faults Insufficient point

Method used

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  • Active power distribution network fault positioning method based on feeder line marking method and impedance method
  • Active power distribution network fault positioning method based on feeder line marking method and impedance method
  • Active power distribution network fault positioning method based on feeder line marking method and impedance method

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Embodiment

[0090] An overall flowchart of an active distribution network fault location method based on the opportunity feeder marking method-impedance method includes the following steps:

[0091] Step 1: Real-time upload of distribution network information

[0092] During the initialization process, the upload of distribution network system information is completed, which includes distribution network topology, feeder parameters, load conditions, fault indicator status information, and node voltage and current values ​​detected by the PMU.

[0093] This implementation example Figure 8 As shown, the system side voltage selects the rated voltage 10.5kV of the 10kV distribution network, and the source impedance value is R s = 0.126Ω, X s =0.004H. The distributed power source selects a photovoltaic power source with an output of 1.5kW / 230V, the active power load on the feeder is 4MW, and the power factor is 0.95. The line adopts the distributed parameter model, and the positive sequen...

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Abstract

The invention discloses an active power distribution network fault positioning method based on a feeder line marking method and an impedance method. The positioning method comprises the following steps: step 1, uploading active power distribution network system information to a data processing center; step 2, establishing a fault event; step 3, traversing the state of the fault indicator in the fault event by adopting a depth-first search algorithm, marking the feeder state in a chart form by utilizing a feeder marking method according to the state information of the fault indicator, and judging that the feeder with the maximum fault index value is a fault feeder; and step 4, establishing an impedance mathematical model of the fault feeder, solving a fault point by adopting an impedance method to obtain positioning of the fault point, and the method has better fault tolerance compared with a matrix algorithm. Meanwhile, the impedance method is adopted on the fault feeder line, so that the positioning efficiency is greatly improved, and the practical value is very good.

Description

technical field [0001] The invention relates to the technical field of power grid fault location, in particular to a power grid fault location method. Background technique [0002] With the depletion of fossil energy and the deteriorating environmental problems, new energy power generation has gradually penetrated into the distribution network. Such penetration has greatly changed the operation mode of the distribution network and put forward new challenges for the safe and stable operation of the distribution network. challenge. Nowadays, with people's continuous demands on the quality of production and life, safe, continuous and stable distribution network power supply is very important. For this reason, many scholars have conducted long-term research on how to realize distribution network fault location. With the continuous advancement of distribution network automation, how to realize the effective location of faults in the distribution network with distributed power ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 王占山万富康徐长华朱宝俊刘明凯王琳张弛
Owner YANGZHOU DEYUN ELECTRICAL EQUIP GRP CO LTD
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