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State labeling method for estimating reliability of distribution network

A state marking and reliability technology, applied in the direction of fault location, etc., can solve problems such as restoring power supply and failure to pass automatic reclosing, and achieve the effect of saving analysis time

Active Publication Date: 2012-07-11
CHINA ELECTRIC POWER RES INST +1
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  • Application Information

AI Technical Summary

Problems solved by technology

The fuse blown and downstream loads are cut off due to instantaneous faults, and the power supply cannot be restored by automatic reclosing

Method used

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  • State labeling method for estimating reliability of distribution network
  • State labeling method for estimating reliability of distribution network
  • State labeling method for estimating reliability of distribution network

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Embodiment Construction

[0060] The present invention "A Topology Analysis and State Marking Method for Distribution Network Reliability Evaluation" considers a series of action sequences of the distribution network after a fault, including fault isolation, distribution network reconfiguration, fault repair, and network topology restoration. Determine the state of each component and load at each step and mark it accordingly, so as to determine the power-off duration of each component and load after the fault occurs, and then accumulate its reliability index. The normally open switch is used when the circuit fails. The switch is momentarily closed to power the circuit.

[0061] Terms used in the present invention, "section": A group of feeder segments bounded by switches. If one of the feeder sections fails, the switch will operate and the entire section will be isolated.

[0062]"Calculation bus": The physical bus must be the calculation bus; the nodes after the switches are merged also form the calc...

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Abstract

The invention provides a state labeling method for estimating the reliability of a distribution network. By the method, the switch-on state of an outage switch and the switch-on state of a normally-open switch in the distribution network can be labeled. Compared with the prior art, the invention has the advantages that: fault analysis time of the distribution network which is operated in real time can be shortened; and the outage duration time of each element and each load after faults can be accurately and quickly determined, so that reliability indexes of the distribution network can be accumulated.

Description

technical field [0001] The invention relates to the field of electric power system and its automation, in particular to a state marking method for reliability evaluation of distribution network. Background technique [0002] Power system reliability assessment methods can be divided into two categories, namely analysis methods and simulation methods. The network structure of the distribution network is radial, which is different from that of the transmission network. Therefore, the reliability assessment of distribution network is commonly used failure mode and effect analysis (FMEA), which belongs to the analysis method. The distribution network reliability evaluation method depends on the actual action sequence after the distribution network fault, and generally includes several steps such as fault occurrence, protection action, fault isolation, network reconstruction, fault repair, and network restoration. Among them, the protection action depends on the protection conf...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 马康刘海涛刘军苏剑
Owner CHINA ELECTRIC POWER RES INST
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