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Distribution-automation-based power supply reliability evaluation method for distribution system

A technology of power distribution automation and power distribution system, applied in information technology support systems, instruments, data processing applications, etc., can solve the problem that the fault finding time and switching action time cannot be automated, the number and location of terminal installations, and the reliability of power supply cannot adapt Line, can not reflect the power supply reliability of the installation of distribution automation terminals, to achieve the effect of accurate fault finding time and isolation time, accurate power supply reliability, and improved power supply reliability

Inactive Publication Date: 2017-07-07
ECONOMIC TECH RES INST OF STATE GRID ANHUI ELECTRIC POWER
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Problems solved by technology

However, in the existing method, the fault finding time of lines and switching elements is fixed, and the fault finding time and switching action time cannot be changed according to the number and location of automation terminals installed, which cannot reflect the improvement effect of installing power distribution automation terminals on power supply reliability.
[0003] With the popularization of distribution automation, the original method of evaluating the reliability of power supply by using the failure mode and consequence analysis method cannot be adapted to the line where the distribution automation terminal is installed.

Method used

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  • Distribution-automation-based power supply reliability evaluation method for distribution system
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  • Distribution-automation-based power supply reliability evaluation method for distribution system

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specific example

[0050] Such as figure 1 As shown, the system is a test model of an overhead line in a class A power supply area in a certain area. The line length is 3km. Dual power supply. The circuit breaker CB0 at the outlet of the substation has realized three remotes. (Assume that the closing and opening operation times of each switch are equal).

[0051] Taking the load point LD1 as an example, its failure mode consequence analysis table is established, as shown in Table 1:

[0052] Table 1 Failure mode and consequence analysis table of load point LD1 when fully manual

[0053]

[0054] The failure consequence mode analysis is as follows:

[0055] (1) The power failure of bus I0 will affect all the loads of this section of the bus. The outlet circuit breaker CB0 will automatically open the fault for 0.01h, and the contact switch CB1 will be manually closed for 0.3h, totaling 0.31h.

[0056] (2) Power outage due to fault on line I1, fault finding time 0.5*0.5=0.25h, repair time 3...

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Abstract

The invention relates to a distribution-automation-based power supply reliability evaluation method for a distribution system. All fault states, which may occur, of a system are listed; an element fault result analysis is carried out by using a section as a minimum unit of load transferring and each line element as an object, thereby obtaining element fault interruption time; and then reliability index calculation is carried out to obtain a power supply reliability index of a distribution system. The element fault interruption time consists of fault searching time, fault region isolation time, and fault repairing time; the reliability index calculation includes calculation of a system average interruption frequency index (SAIFI) with a unit of times / household.year, a system average interruption duration index (SAIDI) with a unit of hour / household.year, a customer average interruption duration index (CAIDI) with a unit of hour / interruption customer.year, and an ASAI with a unit of percentage. According to the invention, the adaptability to an analysis of reliability of different wiring modes is high and the fault searching time and isolation time become accurate.

Description

technical field [0001] The invention relates to a power supply reliability evaluation method of a power distribution system. In particular, it relates to a distribution automation-based power supply reliability evaluation method for distribution systems. Background technique [0002] At present, in the power supply reliability assessment of power distribution system, the failure mode and effect analysis (FMEA) is usually used to evaluate the power supply reliability of power distribution system. In this method, all possible fault states of the system are firstly listed, and each basic fault event and its consequences are analyzed with the segment as the smallest unit of load transfer and each line element as the object. Then set the failure rate and power outage time of each component in the case of failure in turn, and calculate the power supply reliability index under the current fault respectively, and accumulate the results to obtain the power supply reliability index o...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/06393G06Q50/06Y04S10/50
Inventor 荣秀婷叶彬陈煜李周吴延峰
Owner ECONOMIC TECH RES INST OF STATE GRID ANHUI ELECTRIC POWER
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