CN106529763B - Power distribution system operation analysis method and device - Google Patents

Power distribution system operation analysis method and device Download PDF

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CN106529763B
CN106529763B CN201610865823.XA CN201610865823A CN106529763B CN 106529763 B CN106529763 B CN 106529763B CN 201610865823 A CN201610865823 A CN 201610865823A CN 106529763 B CN106529763 B CN 106529763B
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unit
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CN106529763A (en
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袁修广
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State Grid Corp of China SGCC
Qingdao Power Supply Co of State Grid Shandong Electric Power Co Ltd
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State Grid Corp of China SGCC
Qingdao Power Supply Co of State Grid Shandong Electric Power Co Ltd
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    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0631—Resource planning, allocation, distributing or scheduling for enterprises or organisations
    • G06Q10/06315—Needs-based resource requirements planning or analysis
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

Abstract

The invention provides a method and a device for analyzing the operation of a power distribution system, wherein the method comprises the following steps: dividing a target feeder in a power distribution system into a plurality of units to be tested; acquiring the fault rate of each unit to be tested; generating a power failure loss function of each type of user on the target feeder line according to the power utilization attribute of the user on the target feeder line; respectively calculating the fault parameters of each unit to be tested according to the power failure loss function and the fault rate; and adjusting the unit to be tested according to the fault parameters. According to the technical scheme, the fault rate of the unit to be tested and the economic loss caused by the fault rate are considered, the accuracy of the operation analysis of the power distribution system is improved, and more accurate and clear fault risk reference can be provided for the power distribution dispatching department quickly.

Description

Power distribution system operation analysis method and device
Technical Field
The invention relates to the field of power distribution analysis, in particular to a power distribution system operation analysis method and device.
Background
With the development of the society of people, the relationship between the life of residents and an electric system is more and more close, and in recent years, important power failure accidents occurring in various places and adverse consequences caused by the serious power failure accidents indicate the importance of carrying out system operation analysis on the electric system. The safe and reliable operation of the power utilization system depends on an efficient and accurate operation analysis method, and the existing operation analysis method aiming at the power utilization system mainly comprises the following two methods:
1. and (3) determinacy evaluation: deterministic evaluation is mainly directed to the severity of the accident and does not take into account the possibility of different accidents and operating conditions. The commonly adopted deterministic evaluation methods include sensitivity analysis methods, numerical simulation methods, numerical methods and the like.
2. Probabilistic evaluation: probabilistic methods can be divided into two broad categories, analytical and analog. The probability evaluation can measure the probability of system fault occurrence and the severity probability of accident, however, the probability and the consequences cannot be synthesized, and the analysis evaluation method is difficult to adapt to the system development requirement.
The prior art has the following disadvantages: the existing power utilization system risk assessment method mainly aims at a power transmission system, and is few in operation analysis method specially aiming at the power distribution system, compared with the power transmission system, the power distribution system is more complex in structure, the number of power distribution equipment is larger, the power distribution system is designed in a closed loop mode and operates in an open loop mode, and if the operation analysis method aiming at the power transmission system is applied to the power distribution system, the analysis result is not accurate enough.
Therefore, how to overcome the defect that the operation analysis method in the prior art cannot quickly and accurately acquire weak links in the power distribution system becomes a technical problem to be solved urgently.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is that the operation analysis method in the prior art cannot quickly and accurately acquire weak links in the power distribution system.
In view of this, an aspect of the embodiments of the present invention provides a method for analyzing operation of a power distribution system, including: dividing a target feeder in a power distribution system into a plurality of units to be tested; acquiring the fault rate of each unit to be tested; generating a power failure loss function of each type of user on the target feeder line according to the power utilization attribute of the user on the target feeder line; respectively calculating the fault parameters of each unit to be tested according to the power failure loss function and the fault rate; and adjusting the unit to be tested according to the fault parameters.
Preferably, the generating a power outage loss function of each user on the target feeder according to the user electricity utilization attribute on the target feeder comprises: classifying all users according to the user electricity utilization attribute, wherein the user electricity utilization attribute comprises the following steps: one or more of a user power usage characteristic, a user power outage characteristic, and a user production life characteristic; acquiring power failure loss data of each type of user; and respectively fitting according to the relation between the power failure loss data of each type of user and the power failure time of the user to obtain the power failure loss function of each type of user.
Preferably, the calculating the fault parameter of each unit to be tested according to the power outage loss function and the fault rate includes: acquiring the power failure time of the target feeder line and the total power load in the target feeder line caused by the fault of each unit to be tested; calculating the fault loss of each unit to be tested according to the power failure time of the target feeder line, the power failure loss function and the total power load; and respectively multiplying the fault loss of each unit to be tested with the corresponding fault rate to obtain the fault parameter of each unit to be tested.
Preferably, the fault loss is an economic loss.
Preferably, the unit under test includes: switched components and unswitched components.
According to another aspect of the embodiments of the present invention, there is provided a power distribution system operation analysis apparatus, including: the dividing module is used for dividing a target feeder in the power distribution system into a plurality of units to be tested; the acquisition module is used for acquiring the fault rate of each unit to be tested; the generating module is used for generating a power failure loss function of each type of user on the target feeder line according to the user electricity utilization attribute on the target feeder line; the calculation module is used for calculating the fault parameters of each unit to be tested according to the power failure loss function and the fault rate; and the adjusting module is used for adjusting the unit to be tested according to the fault parameters.
Preferably, the generating module comprises: the classification unit is used for classifying all users according to the user electricity utilization attribute, and the user electricity utilization attribute comprises: one or more of a user power usage characteristic, a user power outage characteristic, and a user production life characteristic; the first acquisition unit is used for acquiring the power failure loss data of each type of user; and the fitting unit is used for respectively fitting the power failure loss data of each type of user and the power failure time of the user to obtain the power failure loss function of each type of user.
Preferably, the calculation module comprises: the second acquisition unit is used for acquiring the power failure time of the target feeder line and the total power load in the target feeder line caused by the fault of each unit to be tested; the first calculation unit is used for calculating the fault loss of each unit to be measured according to the power failure time of the target feeder line, the power failure loss function and the total power load; and the second calculation unit is used for multiplying the fault loss of each unit to be tested with the corresponding fault rate to obtain the fault parameter of each unit to be tested.
Preferably, the fault loss is an economic loss.
Preferably, the unit under test includes: switched components and unswitched components.
The technical scheme of the invention has the following advantages:
the invention provides a distribution system operation analysis method, firstly dividing a target feeder line in a distribution system into a plurality of units to be tested, obtaining the fault rate of each unit to be tested, then classifying users on the target feeder line according to different user electricity utilization attributes, obtaining a function (namely a power failure loss function) of the relation between the power failure economic loss and the power failure time of each type of users, finally multiplying the fault rate of different units to be tested and the economic loss generated by the fault of the unit to be tested as the fault parameter of the unit to be tested, in practical application, only summing the fault parameters of each unit to be tested to obtain the fault parameter value of the whole target feeder line or the whole distribution system, further adjusting the unit to be tested in the distribution system according to the fault parameter to ensure the safe operation of the distribution system, compared with the prior art, the method simultaneously considers the fault rate of the unit to be tested and the economic loss caused by the fault rate, the accuracy of the operation analysis of the power distribution system is improved, and more accurate and clear fault risk reference can be rapidly provided for the power distribution dispatching department.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of an operation analysis method of a power distribution system according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a power distribution system according to embodiment 1 of the present invention;
fig. 3 is a block diagram of an apparatus for analyzing operation of a power distribution system according to embodiment 2 of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The present embodiment provides a method for analyzing operation of a power distribution system, which is particularly suitable for risk analysis of operation of the power distribution system, and the following describes the scheme in detail by taking a feeder F1 in the power distribution system as shown in fig. 2 as an example of a target feeder, as shown in fig. 1, the method includes the following steps:
s1: a target feeder (i.e., feeder F1) in a power distribution system is divided into a plurality of units under test, including but not limited to: switched components and unswitched components. Specifically, firstly, the feeder F1 in the power distribution system may be divided into the to-be-tested units by using various switches as boundaries, and the divided regions to be tested and various switches are numbered correspondingly, as shown in fig. 2, the section switch is used as a boundary, and the feeder F1 is divided into 4 regions to be tested (as indicated by a dotted line in fig. 2), where the section switch belongs to a component with a switch, and the 4 regions to be tested are all components without a switch, and both of the components can be used as the to-be-tested units in this embodiment, so that the 4 regions to be tested without a switch can be regarded as 4 equivalent load nodes, and the feeder F1 is converted into a simplified network only consisting of the load nodes and various switches.
S2: and acquiring the fault rate of each unit to be tested. Specifically, the method may include the steps of:
step 1: then, the failure times of each line, transformer and each switch on the feeder F1 can be searched from the historical database, so as to obtain the failure rate of each element, as shown in table 1:
TABLE 1 component failure Rate
Figure BDA0001123746250000061
Step 2: respectively calculating the fault rates of 4 regions to be tested according to the fault rates of the elements obtained in the step 1, that is, the fault rate of each region to be tested can be finally obtained, if the region i to be tested of the feeder line F1 contains m lines (excluding the power consumption elements on the lines) and n load branches (both m and n are positive integers), and assuming that the elements in the region i to be tested have a serial logic relationship, the fault rate λ of the region i to be tested can be specifically calculated according to the following formulai：
Figure BDA0001123746250000062
Wherein λ isij、λiklAnd λiktRespectively representing the fault rate of the jth line in the area i to be tested, the fault rate of the line in the kth load branch and the fault rate of the transformer in the kth load branch, wherein the unit is times/year; the failure rate of the unit under test may include: failure rate lambda of area i to be measurediAnd a section switch Si(i 1,2.. gth)) of a fault rate λsi。
S3: and generating a power failure loss function of each type of user on the target feeder line according to the power utilization attribute of the user on the target feeder line. As a preferable scheme, the step S3 includes:
step 1: all subscribers are classified according to subscriber electricity attributes on target feeder F1, including but not limited to: one or more of a consumer power usage characteristic, a consumer power outage characteristic, and a consumer production life characteristic.
Step 2: the power outage loss data of each type of users can be obtained, for example, the users on the feeder F1 can be investigated according to the power utilization characteristics, power outage characteristics and production economic activity characteristics of different types of power users, and the users can be classified according to historical power outage loss data of all users obtained through investigation (for example, the power outage loss can be sudden power failure or actual economic loss caused by power failure for a period of time), for example, the users on the feeder F1 can be classified into 7 types: large users, industrial users, commercial users, agricultural users, residential users, government agencies, office buildings, and data collation is performed as shown in table 2:
TABLE 2 different user units power loss (Yuan/kW)
Figure BDA0001123746250000071
And step 3: and respectively fitting according to the relation between the power failure loss data of each type of user and the power failure time of the user to obtain the power failure loss function of each type of user. For example, according to the data shown in table 2 in step 2, the power outage loss function of each type of user can be fitted by using a least square method, specifically, a least square method can be adopted, and an MATLAB operation tool is used to perform linear, polynomial quadratic, cubic, quartic, quintic function curve fitting on the power outage economic loss of each type of user, so as to finally obtain the optimal fitting function of the power outage economic loss, that is, the power outage loss function, and C is setj(t) (j ═ 1,2,3,4,5,6,7) are respectively the power failure loss function of the major users, the industrial users, the commercial users, the agricultural users, the residential users, the government offices and the office buildings in turn within the power failure time t, and the power failure loss function of each type of users is as follows:
C1＝-0.0441t4+0.7214t3-3.5173t2+9.0905t+4.8745
C2＝0.3063t4-3.4303t3+7.9563t2+33.0203t+7.5725
C3＝0.1458t4-1.3066t3+2.5766t2+40.1085t+1.2358
C4＝-0.0698t4+0.9328t3-3.3671t2+5.5406t+0.2086
C5＝0.0028t4-0.0830t3+1.5976t2+0.9031t-0.0105
C6＝0.1421t4-1.5990t3+5.2969t2+3.4591t+0.1609
C7＝0.0378t5-0.3775t4+3.9303t2+79.1649t+22.5695
s4: and respectively calculating the fault parameters of each unit to be tested according to the power failure loss function and the fault rate. As a preferable scheme, the step S3 may include:
step 1: and acquiring the power failure time of the target feeder line and the total power load in the target feeder line caused by the fault of each unit to be tested. For example, the fault isolation time can be set as t1The time of the fault transfer is t2Fault repair time of riWherein the fault repair time is riCan be calculated according to the following formula:
Figure BDA0001123746250000081
in the above formula, tij、tiklAnd tiktThe fault repairing time of the j-th line in the area i to be tested, the fault repairing time of the line in the k-th load branch and the fault repairing time of the transformer in the k-th load branch are respectively represented, and the unit can be h/time. If the area i to be detected has a fault, the circuit breaker at the outgoing end of the feeder F1 acts, the whole feeder is powered off, and then the disconnecting switches (which can be the section switch S) at the two ends of the area i to be detected are foundi) And isolating the area i to be measured. The load point of the upstream feeder line of the area i to be tested normally supplies power through the bus, so the power failure time t of the load point of the upstream feeder line is equal to the fault isolation time t1Since whether the feeder F1 includes the transfer switch affects the calculation of the power failure time t of different units under test, the power failure time t of different units under test can be calculatedIt may be assumed that the transfer switch variable is α, α ═ 1 indicates that there is a transfer switch, and α ═ 0 indicates that there is no transfer switch. When the switch is switched on, the load point of the downstream feeder line recovers the normal power supply through switching, and the time t of switching the fault is set2The power failure time t of the downstream feeder load point is equal to alpha (t)1+t2)+(1-α)riAnd the power failure time of the area i to be tested is equal to the fault repair time ri(ii) a If it is a section switch SiIn case of failure, section switch S(i-1)And S(i+1)Act to locate the region to be testediAnd i +1 isolation. The power failure time t of the upstream feeder load point of the isolated area to be tested is the fault isolation time t1The power failure time t of the isolated area to be tested is a section switch SiFault repair time r ofsiThe power failure time t of the downstream feeder load point of the isolated area to be tested is alpha (t)1+t2)+(1-α)rsi. The total power load of the feeder F1 can be obtained from a database of the power distribution system, specifically, P can be usedij、Pij′、Pij"(j ═ 1,2,3,4,5,6,7) indicates the upstream feeder load point, the downstream feeder load point, and the total electrical load of the area i under test, respectively.
Step 2: and calculating the fault loss of each unit to be tested according to the power failure time t, the power failure loss function and the total power load of the target feeder line. The fault loss here may be an economic loss caused by the fault, and specifically, the fault loss analysis process of different units to be tested on the feeder F1 is as follows:
case 1: if the area i to be tested has a fault, the power failure economic loss of the upstream feeder load point caused by the fault of the area i to be tested is as follows:
Figure BDA0001123746250000091
the power failure economic loss of the downstream feeder load point caused by the fault of the area i to be tested is as follows:
Figure BDA0001123746250000101
the power failure economic loss of the fault of the area i to be tested to the fault is as follows:
Figure BDA0001123746250000102
the fault loss of the area i to be measured is as follows:
Szone(s)＝Si1+Si2+Si3
Case 2: if it is a section switch SiThe power failure economic loss of the upstream feeder load point, the power failure economic loss of the downstream feeder load point and the power failure economic loss generated by the downstream feeder load point are S respectivelysi1、Ssi2And Ssi3(the specific calculation formula is the same as the case 1), the section switch SiThe failure loss of (2) is:
Sswitch with a switch body＝Ssi1+Ssi2+Ssi3。
And step 3: and respectively multiplying the fault loss of each unit to be tested with the corresponding fault rate to obtain the fault parameter of each unit to be tested. Specifically, the fault parameter values of the area i to be measured are as follows:
Ri＝λi×Szone(s)
Section switch SiThe fault parameter values of (a) are:
Rsi＝λsi×Sswitch with a switch body
Further, the fault parameter values of the whole feeder F1 can be obtained as follows:
Figure BDA0001123746250000103
the k and the g respectively represent the number of the regions to be tested of the whole feeder line F1 and the number of the section switches, and the larger the fault parameter is, the larger the fault risk of the system is. As shown in table 3, for the fault parameter values of each unit under test of feeder F1:
TABLE 3 feeder F1 Fault parameter values for regions under test
Figure BDA0001123746250000111
As shown in table 4, for the values of the fault parameters of the sectionalizing switches in feed line F1:
TABLE 4 feeder F1 sectionalizer Fault parameter values
Figure BDA0001123746250000112
S5: and adjusting the unit to be tested according to the fault parameters. Specifically, the element configuration of each unit under test of the feeder F1 may be adjusted according to the fault parameter values of each unit under test and the section switch in the feeder F1 obtained in step S4, such as: as can be seen from table 3, although the failure rate of the area to be measured 3 is greater than that of the area to be measured 2, the failure parameter value is smaller than that of the area to be measured 2, so that the possibility of failure occurrence cannot be considered singly when performing operation analysis of the power distribution system, or the failure severity is simply considered, but the two are combined to be considered comprehensively, and it can be clearly seen from table 3 that the feeder installation switch can well reduce the failure parameter value of the area to be measured, and the switch can be provided for the relevant feeder, so as to reduce the failure risk of the power distribution system and improve the operation safety of the power distribution system. On the other hand, as can be seen from table 4, the fault losses of the different section switches in the feeder F1 are greatly different, but the fault parameter value is relatively small, because the fault rate of the section switches is relatively small, so the fault loss condition and the fault rate are considered in the operation analysis of the power distribution system, and the waste of power risk investment is avoided.
According to the operation analysis method of the power distribution system, the fault parameter value of the feeder F1 is obtained, the fault parameter value of each feeder in the power distribution system can be obtained in the same way, and the fault parameter values of all the feeders are added, so that the fault parameter value of the whole power distribution system can be obtained, the operation analysis of the power distribution system is clear and accurate, and the weak link of the power distribution system is quickly found for adjustment.
According to the operation analysis method of the power distribution system, the fault rates of different units to be tested are multiplied by the economic loss generated by the fault of the unit to be tested to serve as the fault parameter value of the unit to be tested, in practical application, the fault parameter value of the whole target feeder line or the whole power distribution system can be obtained only by summing the fault parameter values of the units to be tested, and then the component composition in the power distribution system is adjusted according to the fault parameter to guarantee the safe operation of the power distribution system.
Example 2
The present embodiment provides an apparatus for analyzing operation of a power distribution system, which is particularly suitable for risk analysis of operation of the power distribution system, and the following describes the scheme in detail by taking one feeder F1 in the power distribution system shown in fig. 2 in embodiment 1 as a target feeder, as shown in fig. 3, including: the dividing module 31, the obtaining module 32, the generating module 33, the calculating module 34 and the adjusting module 35, specifically, the functions of the modules are as follows:
the dividing module 31 is configured to divide a target feeder in the power distribution system into a plurality of units to be tested, which is specifically described in embodiment 1 for the detailed description of step S1.
The obtaining module 32 is configured to obtain a failure rate of each unit to be tested, which is specifically described in detail in step S2 in embodiment 1.
The generating module 33 is configured to generate a power outage loss function for each type of user on the target feeder according to the user electricity consumption attribute on the target feeder, specifically refer to the detailed description of step S3 in embodiment 1.
The calculating module 34 is configured to calculate the fault parameter of each unit to be tested according to the power outage loss function and the fault rate, specifically refer to the detailed description of step S4 in embodiment 1.
The adjusting module 35 is configured to adjust the unit to be tested according to the fault parameter, specifically refer to the detailed description of step S5 in embodiment 1.
As a preferable scheme, the generating module 33 includes: the classifying unit 331 is configured to classify all users according to user electricity consumption attributes, where the user electricity consumption attributes include: one or more of a user power usage characteristic, a user power outage characteristic, and a user production life characteristic; a first obtaining unit 332, configured to obtain power outage loss data of each type of user; and the fitting unit 333 is configured to respectively fit the power outage loss data of each type of user to the power outage time of the user to obtain a power outage loss function of each type of user. See in particular the detailed description of the preferred embodiment of step S3 in example 1.
As a preferred solution, the calculation module 34 includes: a second obtaining unit 341, configured to obtain the power outage time of the target feeder and the total power load in the target feeder caused when each unit to be tested fails; the first calculating unit 342 is configured to calculate, according to the power outage time of the target feeder, the power outage loss function, and the total power load, a fault loss of each unit to be measured; the second calculating unit 343 is configured to multiply the fault loss of each unit under test with the corresponding fault rate, respectively, to obtain a fault parameter value of each unit under test. See in particular the detailed description of the preferred embodiment of step S4 in example 1.
As a preferred scheme, the failure loss is economic loss; the unit under test includes: switched components and unswitched components. See in particular the detailed description in example 1.
The distribution system operation analysis device that this embodiment provided, through multiplying the fault rate of the unit that awaits measuring of difference with the economic loss that the unit trouble that awaits measuring produced, as the fault parameter value of the unit that awaits measuring, in practical application, only need sum the fault parameter value of each unit that awaits measuring, can obtain the fault parameter value of whole target feeder or whole distribution system, and then constitute according to the component of fault parameter in to the distribution system and adjust, in order to guarantee the safe operation of distribution system, compare with prior art, the fault rate of the unit that awaits measuring and the economic loss that brings are considered simultaneously to the method, distribution system operation analysis's accuracy has been improved, can provide more accurate, clear fault risk reference for distribution department's dispatch fast.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (6)

1. A method for analyzing the operation of a power distribution system, comprising:
dividing a target feeder in a power distribution system into a plurality of units to be tested;
acquiring the fault rate of each unit to be tested;
generating a power failure loss function of each type of user on the target feeder line according to the power utilization attribute of the user on the target feeder line;
respectively calculating the fault parameters of each unit to be tested according to the power failure loss function and the fault rate;
adjusting the unit to be tested according to the fault parameter, specifically adjusting the component composition of each unit to be tested of the target feeder line according to the obtained fault parameter values of each unit to be tested and the section switch in the target feeder line;
the generating of the power outage loss function of each user on the target feeder line according to the user electricity utilization attribute on the target feeder line comprises:
classifying all users according to the user electricity utilization attribute, wherein the user electricity utilization attribute comprises the following steps: one or more of a user power usage characteristic, a user power outage characteristic, and a user production life characteristic;
acquiring power failure loss data of each type of user;
the method for acquiring the fault rate of each unit to be tested comprises the following steps:
searching the fault times of each line, transformer and each switch on the target feeder line from a historical database, and further acquiring the fault rate of each element; according to the obtainingRespectively calculating the fault rate of the area to be tested according to the fault rate of each element, finally obtaining the fault rate of each area to be tested, and specifically calculating the fault rate lambda of the area i to be tested according to the following formulai：
Figure FDA0002551713670000011
The device comprises a target feeder line, a region i to be tested of the target feeder line, a load circuit and a load circuit, wherein the region i to be tested of the target feeder line comprises m lines and n load branches, m and n are positive integers, and elements in the region i to be tested have a serial logic relationship; lambda [ alpha ]ij、λiklAnd λiktRespectively representing the fault rate of the jth line in the area i to be tested, the fault rate of the line in the kth load branch and the fault rate of the transformer in the kth load branch, wherein the unit is times/year;
the failure rates of the units under test include: failure rate lambda of area i to be measurediAnd a section switch SiFailure rate of (A)siWherein i 1,2.. g;
the step of respectively calculating the fault parameters of each unit to be tested according to the power failure loss function and the fault rate comprises the following steps:
acquiring the power failure time of the target feeder line and the total power load in the target feeder line caused by the fault of each unit to be tested;
calculating the fault loss of each unit to be tested according to the power failure time of the target feeder line, the power failure loss function and the total power load;
respectively multiplying the fault loss of each unit to be tested with the corresponding fault rate to obtain a fault parameter of each unit to be tested;
the method specifically comprises the following steps:
if the area i to be tested has a fault, the power failure economic loss of the upstream feeder load point caused by the fault of the area i to be tested is as follows:
Figure FDA0002551713670000021
wherein j is 1,2,3,4,5,6,7，PijThe total power load of an upstream feeder load point of the area to be tested is obtained;
the power failure economic loss of the downstream feeder load point caused by the fault of the area i to be tested is as follows:
Figure FDA0002551713670000022
wherein, CjAs a loss function for the jth user, t1To set the fault isolation time, t2For the provision of time for a fault, riAlpha is a supply switch variable P 'for reasons of fault repair time'ijThe total power load of the downstream feeder load point;
the power failure economic loss of the fault of the area i to be tested to the fault is as follows:
Figure FDA0002551713670000023
wherein, P "ijThe total power load of the area i to be measured;
the fault loss of the area i to be measured is as follows:
Sunit cell＝Si1+Si2+Si3
If the section switch Si is in fault, the power failure economic loss of the upstream feeder load point, the power failure economic loss of the downstream feeder load point and the power failure economic loss generated by the section switch Si are respectively Ssi1、Ssi2And Ssi3Then, the fault loss of the section switch Si is:
Sswitch with a switch body＝Ssi1+Ssi2+Ssi3
Respectively multiplying the fault loss of each unit to be tested with the corresponding fault rate to obtain a fault parameter of each unit to be tested; specifically, the fault parameter values of the area i to be measured are as follows:
Ri＝λi×Sunit cell
The fault parameter values of the section switch Si are as follows:
Rsi＝λsi×Sswitch with a switch body
Further, the fault parameter values of the whole feeder line are:
Figure FDA0002551713670000024
and k and g respectively represent the number of the units to be tested of the whole feeder line and the number of the section switches.
2. The power distribution system operation analysis method of claim 1, wherein the fault loss is an economic loss.
3. The power distribution system operation analysis method according to any one of claims 1 to 2, wherein the unit under test includes: switched components and unswitched components.
4. An apparatus for analyzing operation of a power distribution system, comprising:
the dividing module is used for dividing a target feeder in the power distribution system into a plurality of units to be tested;
the acquisition module is used for acquiring the fault rate of each unit to be tested;
the generating module is used for generating a power failure loss function of each type of user on the target feeder line according to the user electricity utilization attribute on the target feeder line;
the calculation module is used for calculating the fault parameters of each unit to be tested according to the power failure loss function and the fault rate;
the adjusting module is used for adjusting the units to be tested according to the fault parameters, specifically, adjusting the component composition of each unit to be tested of the target feeder line according to the obtained fault parameter values of each unit to be tested and the section switch in the target feeder line;
the generation module comprises:
the classification unit is used for classifying all users according to the user electricity utilization attribute, and the user electricity utilization attribute comprises: one or more of a user power usage characteristic, a user power outage characteristic, and a user production life characteristic;
the first acquisition unit is used for acquiring the power failure loss data of each type of user;
the method for acquiring the fault rate of each unit to be tested comprises the following steps:
searching the fault times of each line, transformer and each switch on the target feeder line from a historical database, and further acquiring the fault rate of each element; respectively calculating the fault rate of the area to be tested according to the obtained fault rate of each element, finally obtaining the fault rate of each area to be tested, and specifically calculating the fault rate lambda of the area i to be tested by the following formulai：
Figure FDA0002551713670000031
The device comprises a target feeder line, a region i to be tested of the target feeder line, a load circuit and a load circuit, wherein the region i to be tested of the target feeder line comprises m lines and n load branches, m and n are positive integers, and elements in the region i to be tested have a serial logic relationship; lambda [ alpha ]ij、λiklAnd λiktRespectively representing the fault rate of the jth line in the area i to be tested, the fault rate of the line in the kth load branch and the fault rate of the transformer in the kth load branch, wherein the unit is times/year;
the failure rates of the units under test include: failure rate lambda of area i to be measurediAnd a section switch SiFailure rate of (A)siWherein i 1,2.. g;
the fitting unit is used for respectively fitting the power failure loss data of each type of user and the power failure time of the user to obtain the power failure loss function of each type of user;
the calculation module comprises:
the second acquisition unit is used for acquiring the power failure time of the target feeder line and the total power load in the target feeder line caused by the fault of each unit to be tested;
the first calculation unit is used for calculating the fault loss of each unit to be measured according to the power failure time of the target feeder line, the power failure loss function and the total power load;
the second calculation unit is used for multiplying the fault loss of each unit to be tested with the corresponding fault rate to obtain a fault parameter of each unit to be tested;
the method specifically comprises the following steps:
if the area i to be tested has a fault, the power failure economic loss of the upstream feeder load point caused by the fault of the area i to be tested is as follows:
Figure FDA0002551713670000041
wherein j is 1,2,3,4,5,6,7, PijThe total power load of an upstream feeder load point of the area to be tested is obtained;
the power failure economic loss of the downstream feeder load point caused by the fault of the area i to be tested is as follows:
Figure FDA0002551713670000042
wherein, CjAs a loss function for the jth user, t1To set the fault isolation time, t2For the provision of time for a fault, riAlpha is a supply switch variable P 'for reasons of fault repair time'ijThe total power load of the downstream feeder load point;
the power failure economic loss of the fault of the area i to be tested to the fault is as follows:
Figure FDA0002551713670000043
wherein, P "ijThe total power load of the area i to be measured;
the fault loss of the area i to be measured is as follows:
Sunit cell＝Si1+Si2+Si3
If the section switch Si is in failure, the power failure economic loss of the upstream feeder load point and the power failure economic loss of the downstream feeder load point are causedThe loss and the power failure economic loss generated by the loss are respectively Ssi1、Ssi2And Ssi3Then, the fault loss of the section switch Si is:
Sswitch with a switch body＝Ssi1+Ssi2+Ssi3
Respectively multiplying the fault loss of each unit to be tested with the corresponding fault rate to obtain a fault parameter of each unit to be tested; specifically, the fault parameter values of the area i to be measured are as follows:
Ri＝λi×Sunit cell
The fault parameter values of the section switch Si are as follows:
Rsi＝λsi×Sswitch with a switch body
Further, the fault parameter values of the whole feeder line are:
Figure FDA0002551713670000051
and k and g respectively represent the number of the units to be tested of the whole feeder line and the number of the section switches.
5. The power distribution system operation analysis device of claim 4, wherein the fault loss is an economic loss.
6. The power distribution system operation analysis device according to any one of claims 4 to 5, wherein the unit under test includes: switched components and unswitched components.
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