CN104376505B - A kind of operation reliability evaluation method of power distribution network in power system - Google Patents

Abstract

The present invention relates to a kind of operation reliability evaluation method of power distribution network in power system, belong to Power System Reliability Analysis technical field.The method is calculated based on each monolithic element health index in power distribution network by the conversion of health index and health index Probability Forms, and the system health index is evaluated with reference to its connected mode.And according to its analysis result, rationally determine the time between overhauls(TBO) of equipment, reduce operation of power networks and electric power apparatus examination expense and improve equipment operational reliability.This method evaluates power distribution network health status in 0 to 10 numerical indication forms, can be that reliability service and the repair schedule formulation of power distribution network are provided fundamental basis.So as to further lift distribution network planning, O＆M and managerial skills, power distribution network asset management system is improved.

Description

A kind of operation reliability evaluation method of power distribution network in power system

Technical field

The present invention relates to a kind of operation reliability evaluation method of power distribution network in power system, belong to Power System Reliability Analysis technical field.

Background technology

Developed countries electric load just enters the phase of growing steadily from the eighties in 20th century substantially, power network scale base This is fixed, and has been enter into and in the mature stage more.The development of power distribution network and management be more concern operational reliability and Economy, advances intellectualized technology, lifts service quality.EA companies of Britain are the adaptation Britain aging peak of large-scale equipment Demand, develop it is a set of " based on condition assessment of power grid Risk Management System ", nowadays the system has been employed for institute of Britain There is Utilities Electric Co., and applied with succeeding in countries such as Canada, the U.S., Australia, Malaysia and Singapore.

Since State Grid Corporation of China of China carried out whole-life cycle fee system comprehensively from 2008, shape is progressively started Account, repair based on condition of component data into super-pressure and high-tension apparatus, repair based on condition of component directive/guide, Diagnostic Examination And Repair of Electric Power Facilities is also progressively from super High pressure and high pressure field extend to field of distribution network.

But system for distribution network of power shortcoming is numerous, be in particular in it is following some：

First, equipment kind is numerous and diverse, manufacture threshold is low and manufacturer is numerous, have a large capacity and a wide range；

Second, master data shortcoming or data accumulation inaccurate, that shortage is long-term；

Third, the level of informatization is not high, it is impossible to realize direct collection, the statistics and analysis of field data；

Fourth, financial management lean degree is not high, the linkage of wealth card thing is not yet reached；

Fifth, multi-source information isolated island poor compatibility；

Sixth, automaticity is low, detection level because single equipment cost is relatively low be ignored the shortcomings of, cause tradition Way to manage do not adapt to develop under the new situation the need for.

By the end of current, in the research work that power distribution network difference department carries out, also it is limited only to provide power distribution network mostly Produce the research of the aspects such as management characteristic, means and Informational support.Have part at present in terms of controller switching equipment rank health index Research, but still the health status research without power distribution network network level.

The content of the invention

The purpose of the present invention is to propose to a kind of operation reliability evaluation method of power distribution network in power system, with power distribution network Based on each monolithic element health index, by the conversion of health index and health index Probability Forms, with reference to its connected mode Study system health index is given a mark, and according to its analysis result, rationally determines the time between overhauls(TBO) of equipment, reduce operation of power networks With electric power apparatus examination expense and improve equipment operational reliability.

The modeling method of power distribution network health index, comprises the following steps in power system proposed by the present invention：

If system for distribution network of power includes a main feeder and multilevel branch feeder line, multilevel branch feeder line has a plurality of respectively, Multiple element is connected with every branch feeder, successively to upper level branch feeder etc. since power distribution network most end level branch feeder Value, detailed process comprises the following steps：

(1) the health index HI of all elements in power distribution network is calculated_ij,HI_ijFor j-th of i-stage The health index value of element, is the Arbitrary Digit between 0 to 10.

Wherein, HI₀Health index when being dispatched from the factory for the element, general value is 0.5；E is natural logrithm, T_ijFor element Run time, can obtain from power distribution network data center；B is ageing equipment index, it is considered that health when equipment life terminates Index is 6.5, and equipment operation time limit T can be dispatched from the factory by equipment and obtain in parameter, substitute into above formula, 6.5=0.5 × e^B×T, can therefrom ask Solve B；

(2) each element health index on power distribution network most end level branch feeder is converted into Probability Forms r by following formula_ij：

Wherein, e is natural logrithm；

(3) using the Series system of fail-safe analysis, it is calculated the equivalent health index of most end level branch feeder Probability Forms r_i：

Wherein, M is the M articles branch feeder in all most end level branch feeders of power distribution network,

(4) the i-stage branch feeder for obtaining of above-mentioned steps (3) is connected to the feedback of (i-1) level branch as an element Line, repeat step (2) and step (3), obtain the equivalent health index Probability Forms of (i-1) level branch feeder；

(5) repeat the above steps (2), (3), (4), until reaching main feeder, obtains the master of the element of cascade connection The equivalent health index Probability Forms r on feeder line road₁；

(6) by following formula, by above-mentioned steps (5) equivalence health index Probability Forms r₁Be converted to health index HI_Always：

With health index HI_AlwaysAs the foundation of the operation reliability evaluation of system for distribution network of power.

The modeling method of power distribution network health index in power system proposed by the present invention, its advantage is：

The inventive method, will for the present situation lacked in current power system to power distribution network network health performance appraisal procedure Topological structure is numerous and diverse, equivalent layer by layer comprising the numerous power distribution network of device, ultimately forms a simple cascaded structure model.Together When, it is contemplated that facility level health index cannot participate in the shortcoming of cascaded structure network analysis, it is proposed that a kind of health index with The conversion computing formula of health index Probability Forms, is used with will easily connect less equipment health index in network each other In the fail-safe analysis of power system, network equipment operation service condition was both considered, network topology structure had been combined again, and And result of calculation is higher with the actual conditions goodness of fit, power system is set to evaluate power distribution network in 0 to 10 numerical indication form Health status, can be that reliability service and the repair schedule formulation of power distribution network are provided fundamental basis.So as to further lift power distribution network Planning, O＆M and managerial skills, improve power distribution network asset management system.

Brief description of the drawings

Fig. 1 is the simple power distribution system network structure chart that the inventive method is related to.

Fig. 2 is the Equivalent Simplification schematic diagram of the power distribution network most end level branch feeder in the inventive method.

In Fig. 1 and Fig. 2,1 is main feeder, and 2 is one-level branch feeder, and 3 is two grades of branch feeders.

Specific embodiment

Power distribution network is often to be made up of with branch feeder and its element being connected main feeder, and the inventive method is referred to System for distribution network of power comprising a main feeder and a plurality of branch feeder, its structure by main feeder 1 as shown in figure 1, first, opened Begin search, the branch feeder on main feeder that will be searched, one-level branch feeder 2 and two grades of branch feeders 3 in such as Fig. 1 and its The element (including disconnecting switch, section switch, fuse, branch line etc.) of connection is divided into same layer, while finding branch's feedback Whether line also includes subordinate's branch feeder, and network layer statistics is obtained by searching for layer by layer.

The modeling method of power distribution network health index, comprises the following steps in power system proposed by the present invention：

If system for distribution network of power includes a main feeder and multilevel branch feeder line, multilevel branch feeder line has a plurality of respectively, Multiple element is connected with every branch feeder, successively to upper level branch feeder etc. since power distribution network most end level branch feeder Value, detailed process comprises the following steps：

(1) health index of all elements in power distribution network is calculatedHI_ijIt is i-stage jth The health index value of individual element, is the Arbitrary Digit between 0 to 10.

Wherein, HI₀Health index when being dispatched from the factory for the element, general value is 0.5；E is natural logrithm, T_ijFor element Run time, can obtain from power distribution network data center；B is ageing equipment index, it is considered that health when equipment life terminates Index is 6.5, and equipment operation time limit T can be dispatched from the factory by equipment and obtain in parameter, substitute into above formula, 6.5=0.5 × e^B×T, can therefrom ask Solve B；

(2) each element health index on power distribution network most end level branch feeder is converted into Probability Forms r by following formula_ij：

Wherein, e is natural logrithm；

(3) using the Series system of fail-safe analysis, it is calculated the equivalent health index of most end level branch feeder Probability Forms r_i：

Wherein, M is the M articles branch feeder in all most end level branch feeders of power distribution network,

(4) the i-stage branch feeder for obtaining of above-mentioned steps (3) is connected to the feedback of (i-1) level branch as an element Line, repeat step (2) and step (3), obtain the equivalent health index Probability Forms of (i-1) level branch feeder, such as Fig. 2 institutes Show；

(5) repeat the above steps (2), (3), (4), until reaching main feeder, obtains the master of the element of cascade connection The equivalent health index Probability Forms r on feeder line road₁；

(6) by following formula, by above-mentioned steps (5) equivalence health index Probability Forms r₁Be converted to health index HI_Always：

With health index HI_AlwaysAs the foundation of the operation reliability evaluation of system for distribution network of power.In general, HI_Always Numerical value is smaller, and the operational reliability degree for representing system for distribution network of power is higher.

Claims (1)

1. in a kind of power system power distribution network operation reliability evaluation method, it is characterised in that the method is comprised the following steps：

If system for distribution network of power includes a main feeder and multilevel branch feeder line, multilevel branch feeder line has a plurality of branch to present respectively Line, multiple element is connected with every branch feeder, is presented to upper level branch successively since power distribution network most end level branch feeder Line is equivalent, and detailed process comprises the following steps：

(1) the health index HI of all elements in power distribution network is calculated_ij,HI_ijIt is j-th element of i-stage Health index value, is the Arbitrary Digit between 0 to 10；

Wherein, HI₀Health index when being dispatched from the factory for the element, general value is 0.5；E is natural logrithm, T_ijFor element has run Time, obtained from power distribution network data center, B is ageing equipment index, health index is 6.5 when equipment life terminates, equipment fortune Row time limit T is dispatched from the factory by equipment and obtain in parameter, substitutes into above formula, i.e. 6.5=0.5 × e^B×T, therefrom solve B；

(2) each element health index on power distribution network most end level branch feeder is converted into Probability Forms r by following formula_ij：

$r_{ij}=1-e^{-{\left(\frac{{\mathrm{HI}}_{ij}-10}{{\mathrm{HI}}_{ij}}\right)}^2}$

Wherein, e is natural logrithm；

(3) using the Series system of fail-safe analysis, it is calculated the equivalent health index probability of most end level branch feeder Form r_i：

$r_i=\underset{j\∈M}{\Π}{r}_{ij}$

Wherein, M is the M articles branch feeder in all most end level branch feeders of power distribution network,

(4) the i-stage branch feeder for being obtained using above-mentioned steps (3) is connected to (i-1) level branch feeder as an element, Repeat step (2) and step (3), obtain the equivalent health index Probability Forms of (i-1) level branch feeder；

(5) repeat the above steps (2), (3), (4), until reaching main feeder, obtains the main feeder of the element of cascade connection The equivalent health index Probability Forms r on road₁；

(6) by following formula, by above-mentioned steps (5) equivalence health index Probability Forms r₁Be converted to health index HI_Always：

With health index HI_AlwaysAs the foundation of the operation reliability evaluation of system for distribution network of power.