CN112101708A - Expert knowledge fused power grid short circuit safety intelligent decision method and system - Google Patents

Expert knowledge fused power grid short circuit safety intelligent decision method and system Download PDF

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CN112101708A
CN112101708A CN202010758192.8A CN202010758192A CN112101708A CN 112101708 A CN112101708 A CN 112101708A CN 202010758192 A CN202010758192 A CN 202010758192A CN 112101708 A CN112101708 A CN 112101708A
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short
operation mode
circuit
bus
circuit current
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杨学涛
宋墩文
李铮
刘开欣
郁舒雁
马世英
许鹏飞
杜三恩
刘道伟
陈勇
杨红英
冯静
谢家正
赵高尚
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China Electric Power Research Institute Co Ltd CEPRI
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China Electric Power Research Institute Co Ltd CEPRI
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    • 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
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0635—Risk analysis of enterprise or organisation activities
    • 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
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
    • G06Q10/06393—Score-carding, benchmarking or key performance indicator [KPI] analysis
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

Abstract

The invention discloses a power grid short-circuit safety intelligent decision method and system fusing expert knowledge, wherein short-circuit current calculation is carried out according to power grid basic operation mode tide data and a transient stability model to obtain a short-circuit current standard exceeding bus; generating an expert knowledge rule base according to the power flow data of the power grid basic operation mode and the short-circuit current exceeding bus; generating an extended operation mode set according to the power grid basic operation mode trend data and an expert knowledge rule base; according to the extended operation mode set and the transient stability model, carrying out island detection and short-circuit current calculation check on the extended operation mode set to generate a short-circuit safe operation mode set; and calculating short circuit safety evaluation indexes of the short circuit safety operation mode set, generating a short circuit safety optimal operation mode set through screening, and deciding the short circuit safety operation of the power grid by selecting the short circuit safety optimal operation mode in the operation mode set. The problems that in the prior art, the labor cost is high, the number of analysis samples is limited, an optimization decision scheme is difficult to obtain and the like are solved.

Description

Expert knowledge fused power grid short circuit safety intelligent decision method and system
Technical Field
The application relates to the field of power grid analysis and control, in particular to an expert knowledge fused power grid short circuit safety intelligent decision method, and simultaneously relates to an expert knowledge fused power grid short circuit safety intelligent decision system.
Background
The planning of the operation mode of the power grid plays a vital role in ensuring the safe and economic operation of the whole power grid and ensuring the high-quality and reliable power supply of users. With the enhancement of electric connection of a power grid, large-scale new energy access, rapid change of a power grid structure and operation of new electric equipment, the power grid is gradually developed into a multi-source access, high-density and multi-load type network system, the influence of more and more variable factors is faced, and the problem of standard exceeding of short-circuit current becomes more prominent. When the short-circuit safety strategy is made, on one hand, as the structure of the alternating current and direct current power grid is more and more complex, the mode arrangement becomes extremely complicated and complicated, and the amount of information to be processed by workers is greatly increased; on the other hand, aiming at increasingly refined requirements of power grid safe operation management and actual requirements of the power market, the calculation specification of more scene operation modes is developed, for example, short circuit safety analysis of new energy operation modes with different output conditions, a large number of overhaul operation modes, extreme operation modes under special weather conditions and the like is carried out, so that the workload and the working intensity are increased continuously, the working efficiency is low manually according to the conventional working mode, and even the work seems to be insufficient.
The development of software technology and simulation technology provides sufficient conditions for more intelligent operation mode arrangement. Besides more models and more accurate single element models, in the optimization of a simulation calculation module, algorithms such as power flow and short-circuit current are continuously and deeply researched, the operation efficiency of a single processing program is higher, the operation is reliable and stronger, the operation interface mode is more flexible, and more friendly and efficient support is provided for the safe and intelligent decision-making of the power grid short circuit. In the analysis of the short-circuit safety measures of the power grid, a large amount of scanning calculation is involved, and the parallel task requirements are met. In the process of implementing the task parallel, two types of task parallel processing technologies, namely single-machine multi-core parallel and multi-machine multi-core parallel, can be adopted. The hardware technology is taken as an important branch of the computer technology, and through continuous revolution and improvement, the hardware presents trends including smaller volume, more and more precise function, better and more performance, higher and more cost performance and more obvious individuation. Current mainstream memory technologies include magnetic memory, optical memory, and semiconductor memory. When a parallel computing technology is applied to the intelligent arrangement of a complex power grid, the network performance is one of the key factors influencing the computing efficiency, and the transmission bandwidth of hundreds of MHZ (megahertz) and even dozens of THz (multimode and single-mode optical fiber) can be obtained by adopting an optical fiber medium and a high-performance switch.
In the conventional offline calculation and analysis, limited by calculation force and time, manual analysis can only be performed on a small amount of typical operation mode data by using special power system calculation software to perform power grid simulation analysis, and then power grid short-circuit safety measures and operation mode plans are adjusted and made by means of empirical knowledge. The method adopts the operation mode determined by taking experience as the leading factor and the verification type simulation calculation, and has the following defects: influence on the mode change is limited by a calculation tool and manual calculation force, and an analysis delay effect exists; under the constraint of professional cognition, the number of obtained running scheme samples is limited, and some calculation analysis indexes and important analysis contents are possibly omitted under the condition that tools are not arranged in an efficient mode, so that more or more optimal and feasible running schemes for ensuring the safety of a power grid are difficult to obtain; even if a plurality of feasible short-circuit safe operation modes are arranged according to experience, no quantifiable screening and evaluating index is established at present.
At present, research and development of power grid operation mode short circuit safety decision-making software are few, and some software provides mode auxiliary analysis functions of fixed algorithms, but from the application angle, the application software is often not in accordance with the actual work flow of a power grid operation mode arrangement worker, the functional interactivity is poor, the practicability is poor, and the decision-making support effect is difficult to be really played.
Disclosure of Invention
The application provides a power grid short-circuit safety intelligent decision-making method and system fusing expert knowledge, and solves the problems that in the prior art, the labor cost is high, the number of analysis samples is limited, the practicability is poor, an optimization decision-making scheme is difficult to obtain, and the like.
The application provides a power grid short circuit safety intelligent decision method fusing expert knowledge, which comprises the following steps:
calculating short-circuit current according to the power flow data of the power grid basic operation mode and the transient stability model to obtain a short-circuit current exceeding bus;
generating an expert knowledge rule base according to the power flow data of the power grid basic operation mode and the short-circuit current exceeding bus;
generating an extended operation mode set according to the power grid basic operation mode trend data and the expert knowledge rule base;
according to the extended operation mode set and the transient stability model, carrying out island detection and short-circuit current calculation check on the extended operation mode set to generate a short-circuit safe operation mode set;
and calculating short circuit safety evaluation indexes of the short circuit safety operation mode set, generating a short circuit safety optimized operation mode set through screening, selecting a short circuit safety optimized operation mode from the short circuit safety optimized operation mode set, and making a decision on the short circuit safety operation of the power grid.
Preferably, the short-circuit current calculation is performed according to the power flow data of the power grid basic operation mode and the transient stability model, and the short-circuit current exceeding bus is obtained, which includes:
calculating short-circuit current according to the power grid basic operation mode tidal current data, the transient stability model and the fault type, and obtaining the actual short-circuit current value of the AC/DC bus; the power grid basic operation mode trend data comprises the following steps: running mode tidal current data of a generator bus, an alternating current/direct current line, a transformer and FACTS equipment; the transient stability model comprises: the system comprises a generator, an excitation system, a power system stabilizer, a speed regulator, a prime mover, new energy, a direct current control system, power electronic equipment and a load transient stability model;
if the short-circuit current of the bus I meets the standard exceeding criterion Ishort.i＞μiIinter.iTaking the bus i as a short-circuit current exceeding bus; wherein Ishort.iIs the actual short-circuit current value of the AC/DC bus Iinter.iFor breaking the current value of the AC/DC bus i, muiThe interruption current coefficient.
Preferably, generating an expert knowledge rule base according to the power flow data of the power grid basic operation mode and the short-circuit current exceeding bus, wherein the expert knowledge rule base comprises the following steps:
setting a voltage range condition, a topological depth condition and the maximum number of the disconnected and connected lines of a single bus according to the short-circuit current exceeding bus;
taking the voltage range condition, the topological depth condition and the maximum number of the connected lines of the single bus as forward rule generating conditions;
collecting the lines meeting the forward rule generating condition to form a forward rule;
forming a generator associated line set, a transformer associated line set and a load associated line set according to the power flow data of the power grid basic operation mode;
forming a reverse rule according to a union set of the generator associated line set, the transformer associated line set and the load associated line set;
and the expert knowledge rule base is formed by the forward rule and the reverse rule together.
Preferably, the setting of the voltage range condition, the topological depth condition and the maximum number of the disconnected and connected lines of a single bus according to the short-circuit current exceeding bus comprises the following steps:
setting the Voltage Range Condition (V)min,Vmax) In which V ismin、VmaxRespectively setting a lower limit and an upper limit of the voltage grade of the short-circuit current exceeding bus link line;
setting a topological depth condition [ T ]min,Tmax]Wherein T ismin、TmaxRespectively linking the lower limit and the upper limit of the stage number of the epitaxial line, T, of the short-circuit current exceeding the standardmin、TmaxIs an integer;
maximum number of disconnected and connected lines D for arranging single busmaxWherein D ismaxThe selection principle of the strip line is that D in the front is selected according to the sorting of the branch coefficients of the short-circuit current of the bus from large to smallmaxAnd (4) a line.
Preferably, the step of forming the forward rule by collecting the lines satisfying the forward rule generating condition includes:
searching a line set L meeting forward rule generation conditions in basic operation mode trend dataFR，LFRThe number of lines is NLFR；
Line set LFRConstituting a forward rule.
Preferably, the forming of the generator associated line set, the transformer associated line set and the load associated line set according to the power flow data of the power grid basic operation mode includes:
on the basis of the power gridIn the row mode tidal current data, the lines directly linked with the generator bus are searched to form a generator associated line set LGen；
In the power flow data of the power grid basic operation mode, lines directly linked with the transformer are searched to form a transformer associated line set LTran；
In the power flow data of the power grid basic operation mode, the lines directly linked with the load buses are searched to form a load associated line set LLoad。
Preferably, the generating an extended operation mode set according to the power grid basic operation mode trend data and the expert knowledge rule base includes:
removing the line set meeting the reverse rule from the line set meeting the forward rule to form an effective line set LEffe；
Setting the number condition of line breaking combination [ N ]min,Nmax]In which N isminRepresents the lower limit of the number of combinations, NmaxDenotes the upper limit of the number of combinations, Nmin、NmaxIs an integer;
using a combined operation method in mathematics from LEffeIn turn select Nmin,Nmin+1,…,NmaxA line forming a combined set S of line breaksLcut，SLcut＝{S1,S2,…,Si,…,SM}，SiCombined set S for indicating line breakLcutThe ith line on-off combination has the total number of
Figure BDA0002612266410000041
Wherein C represents a combinatorial operation in mathematics;
from SLcutIn the sequence, a line breaking combination S is selectedi(i is 1-M), and searching a line break combination S in the basic operation mode tide dataiCorresponding lines are set to be in an on-off state and stored as extended operation mode power flow data EOi(i is 1 to M) and the extended operation mode set is SEO＝{EO1,EO2,…,EOM}。
Preferably, according to the extended operation mode set and the transient stability model, performing island detection and short-circuit current calculation check on the extended operation mode set to generate a short-circuit safe operation mode set, including:
respectively calculating load flow data of a basic operation mode and load flow data of an extended operation mode by applying a deep search algorithmiThe number of electrical islands (i: 1 to M) is denoted by NLand.Base、NLand.EOi(i＝1～M)；
Calculating the difference N of the electric islands in sequenceLand.Diffi＝NLand.EOi-NLand.BaseIf N is presentLand.DiffiWhen 0, the corresponding EOiBy island detection, EO to be detected by islandiForming a set of topologically efficient ways SRT；
Set S of topologically efficient waysRTEach EO ofiCalculating the short-circuit current to obtain the short-circuit current calculation result, and if the number of the short-circuit current exceeding the standard is 0, the corresponding EOiThrough the safety detection of short-circuit current, the EO detected through the safety detection of short-circuit currentiForm a short-circuit safe operation mode set SSCC。
Preferably, the short-circuit safety evaluation index calculation is performed on the short-circuit safety operation mode set, and the short-circuit safety preferred operation mode set is generated by screening, including:
to SSCCEO of (1)iCalculating the short circuit current evaluation Index (EO) in turni)，
Figure BDA0002612266410000051
Wherein Ishort.i、Iinter.i、μiRespectively showing an actual short-circuit current value, an AC/DC bus i interruption current value and an interruption current coefficient; p represents the total number of the bus bars; lambda [ alpha ]1And λ2Representing the weighting coefficient, to satisfy1+λ21 is ═ 1; max represents taking the maximum value;
for Index (EO)i) From small to largeSorting, taking the front NOptiEach Index (EO)i) Corresponding EOiForm a short-circuit safe preferred operation mode set SOpti。
This application provides a power grid short circuit safety intelligence decision-making system who fuses expert's knowledge simultaneously, includes:
the short-circuit current exceeding bus acquisition module is used for calculating the short-circuit current according to the power flow data of the power grid basic operation mode and the transient stability model to acquire a short-circuit current exceeding bus;
the expert knowledge rule base generation module generates an expert knowledge rule base according to the power flow data of the power grid basic operation mode and the short-circuit current exceeding bus;
the extended operation mode set generation module generates an extended operation mode set according to the power grid basic operation mode trend data and the expert knowledge rule base;
the short-circuit safe operation mode set generation module is used for carrying out island detection and short-circuit current calculation check on the extended operation mode set according to the extended operation mode set and the transient stable model to generate a short-circuit safe operation mode set;
and the short-circuit safety preferred operation mode set generation module is used for calculating short-circuit safety evaluation indexes of the short-circuit safety operation mode set, generating a short-circuit safety preferred operation mode set through screening, selecting a short-circuit safety preferred operation mode from the short-circuit safety preferred operation mode set, and making a decision on the short-circuit safety operation of the power grid.
The application provides an expert knowledge fused power grid short circuit safety intelligent decision method and system, short circuit current calculation is carried out according to power grid basic operation mode trend data and a transient stability model, and a short circuit current standard exceeding bus is obtained; generating an expert knowledge rule base consisting of forward rules and reverse rules according to the power flow data of the power grid basic operation mode and the short-circuit current exceeding bus; generating an extended operation mode set according to the power grid basic operation mode trend data and the expert knowledge rule base; according to the extended operation mode set and the transient stability model, carrying out island detection and short-circuit current calculation check on the extended operation mode set to generate a short-circuit safe operation mode set; and calculating short circuit safety evaluation indexes of the short circuit safety operation mode set, generating a short circuit safety optimized operation mode set through screening, and deciding the short circuit safety operation of the power grid by selecting the short circuit safety optimized operation mode in the operation mode set. The problems that in the prior art, labor cost is high, the number of analysis samples is limited, practicability is poor, an optimization decision scheme is difficult to obtain and the like are solved.
Drawings
FIG. 1 is a schematic flow chart of an expert knowledge-fused power grid short-circuit safety intelligent decision method provided by the present application;
fig. 2 is a schematic structural diagram of an expert knowledge-fused power grid short-circuit safety intelligent decision-making system provided by the application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.
The method provided by the application is explained in detail below with reference to the flow diagram of the expert knowledge-fused power grid short-circuit safety intelligent decision method provided by fig. 1.
And S101, calculating short-circuit current according to the power flow data of the power grid basic operation mode and the transient stability model, and obtaining a short-circuit current exceeding bus.
Before a short-circuit current exceeding bus is obtained, calculation analysis data needs to be selected from existing data, and data in a basic operation mode power flow data file and a transient stability model file are selected from the existing data.
Then, the short-circuit current calculation is performed based on the operation mode. And calculating short-circuit current according to the power grid basic operation mode tidal current data, the transient stability model and the fault type, and obtaining the actual short-circuit current value of the AC/DC bus. The method can be based on SCCPC software (electric power system analysis software), load flow data and a transient stability model of a basic operation mode are input, fault types are set to be three-phase short circuit and single-phase short circuit, the short circuit current of the whole network is scanned and calculated, and the actual short circuit current value of the AC/DC bus is generated.
Based on the actual short-circuit current value of the AC/DC bus (the actual short-circuit current value of the marked bus I is I)short.i) And the AC/DC bus interruption current value (the interruption current value corresponding to the marked bus I is I)inter.i) And the interruption current coefficient (the interruption current coefficient corresponding to the marking bus i is mu)i) The criterion for extracting the short-circuit current exceeding bus is as follows: i isshort.i＞μiIinter.iIf the short-circuit current of the bus I meets the standard exceeding criterion Ishort.i＞μiIinter.iTaking the bus i as a short-circuit current exceeding bus; wherein Ishort.iIs the actual short-circuit current value of the AC/DC bus Iinter.iFor breaking the current value of the AC/DC bus i, muiThe interruption current coefficient.
The power grid basic operation mode trend data comprises the following steps: running mode tidal current data of a generator bus, an alternating current/direct current line, a transformer and FACTS equipment; the transient stability model comprises: the system comprises a generator, an excitation system, a power system stabilizer, a speed regulator, a prime motor, new energy, a direct current control system, power electronic equipment and a load transient stability model.
And S102, generating an expert knowledge rule base according to the power flow data of the power grid basic operation mode and the short-circuit current exceeding bus.
This step is used for rule base generation. The expert knowledge rule base comprises a forward rule and a reverse rule, and the forward rule is generated by the following steps:
according to the condition that the short-circuit current exceeds the standard bus, the voltage range condition, the topological depth condition and the maximum number of the disconnected and connected lines of a single bus are set, the method comprises the following steps: setting the Voltage Range Condition (V)min,Vmax) In which V ismin、VmaxRespectively setting a lower limit and an upper limit of the voltage grade of the short-circuit current exceeding bus link line; setting a topological depth condition [ T ]min,Tmax]Wherein T ismin、TmaxAre short-circuit electricity respectivelyLower and upper limits of the number of stages, T, of bus-linked epitaxial linesmin、TmaxIs an integer; maximum number of disconnected and connected lines D for arranging single busmaxWherein D ismaxThe selection principle of the strip line is that D in the front is selected according to the sorting of the branch coefficients of the short-circuit current of the bus from large to smallmaxA line;
taking the voltage range condition, the topological depth condition and the maximum number of the connected lines of the single bus as forward rule generating conditions;
and (4) collecting the lines meeting the forward rule generation condition to form a forward rule. Searching a line set L meeting forward rule generation conditions in basic operation mode trend dataFR，LFRThe number of lines is NLFR；
Line set LFRConstituting a forward rule.
The steps of the reverse rule generation are as follows:
forming a generator associated line set, a transformer associated line set and a load associated line set according to the power flow data of the power grid basic operation mode; in the power flow data of the power grid basic operation mode, the lines directly linked with the generator buses are searched to form a generator associated line set LGen(ii) a In the power flow data of the power grid basic operation mode, lines directly linked with the transformer are searched to form a transformer associated line set LTran(ii) a In the power flow data of the power grid basic operation mode, the lines directly linked with the load buses are searched to form a load associated line set LLoad；
According to the union of generator-related line set, transformer-related line set and load-related line set, i.e. LGen∪LTran∪LLoadAnd forming a reverse rule.
And finally, forming an expert knowledge rule base by the forward rule and the reverse rule.
And S103, generating an extended operation mode set according to the power grid basic operation mode trend data and the expert knowledge rule base.
This step is used for the extended run mode set generation.
Removing the line sets meeting the reverse rule from the line sets meeting the forward rule to form an effective line set LEffeI.e. LEffe＝LFR-LGen∪LTran∪LLoad；
Setting the number condition of line breaking combination [ N ]min,Nmax]In which N isminRepresents the lower limit of the number of combinations, NmaxDenotes the upper limit of the number of combinations, Nmin、NmaxIs an integer;
using a combined operation method in mathematics from LEffeIn turn select Nmin,Nmin+1,…,NmaxA line forming a combined set S of line breaksLcut，SLcut＝{S1,S2,…,Si,…,SM}，SiCombined set S for indicating line breakLcutThe ith line on-off combination has the total number of
Figure BDA0002612266410000081
Wherein C represents a combinatorial operation in mathematics;
from SLcutIn the sequence, a line breaking combination S is selectedi(i is 1-M), and searching a line break combination S in the basic operation mode tide dataiCorresponding lines are set to be in an on-off state and stored as extended operation mode power flow data EOi(i is 1 to M) and the extended operation mode set is SEO＝{EO1,EO2,…,EOM}。
And step S104, according to the extended operation mode set and the transient stability model, carrying out island detection and short-circuit current calculation check on the extended operation mode set to generate a short-circuit safe operation mode set.
The method is used for generating a short-circuit safe operation mode set.
Respectively calculating load flow data of a basic operation mode and load flow data of an extended operation mode by applying a deep search algorithmiThe number of electrical islands (i: 1 to M) is denoted by NLand.Base、NLand.EOi(i＝1～M)；
Calculating the difference N of the electric islands in sequenceLand.Diffi＝NLand.EOi-NLand.BaseIf N is presentLand.DiffiWhen 0, the corresponding EOiBy island detection, EO to be detected by islandiForming a set of topologically efficient ways SRT；
Set S of topologically efficient waysRTEach EO ofiCalculating the short-circuit current to obtain the short-circuit current calculation result, and if the number of the short-circuit current exceeding the standard is 0, the corresponding EOiThrough the safety detection of short-circuit current, the EO detected through the safety detection of short-circuit currentiForm a short-circuit safe operation mode set SSCC。
And S105, short circuit safety evaluation index calculation is carried out on the short circuit safety operation mode set, a short circuit safety preferred operation mode set is generated through screening, a short circuit safety preferred operation mode is selected from the short circuit safety preferred operation mode set, and decision is carried out on the short circuit safety operation of the power grid.
This step is used for short circuit safety preferred operation mode set generation.
To SSCCEO of (1)iCalculating the short circuit current evaluation Index (EO) in turni)，
Figure BDA0002612266410000091
Wherein Ishort.i、Iinter.i、μiRespectively representing an actual short-circuit current value, an AC/DC bus blocking current value and a blocking current coefficient of an AC/DC bus; p represents the total number of the bus bars; lambda [ alpha ]1And λ2Representing the weighting coefficient, to satisfy1+λ21 is ═ 1; max represents taking the maximum value;
for Index (EO)i) Sorting from small to large, taking the front NOpti(wherein N isOptiDone by manual configuration) Index (EO)i) Corresponding EOiForm a short-circuit safe preferred operation mode set SOpti。
And finally, selecting a short-circuit safe preferred operation mode from the operation modes in a centralized manner, and making a decision on the short-circuit safe operation of the power grid.
The method of the present invention is briefly described below by taking a certain actual grid example data as an example.
Selecting a basic operation mode power flow data DAT file and a transient stability model SWI file; calculating the short-circuit current of the basic operation mode, and extracting to obtain 3 short-circuit current standard exceeding buses:
serial number Name of bus Short-circuit current (kA) Interrupting current (kA) Coefficient of interruption current
1 JSZ21230 54.9574 50 1
2 JXB21230 51.4893 50 1
3 JQH21230 51.2604 50 1
The rule base conditions are set as follows:
voltage Range Condition setting (V)min,Vmax) (200,250), the topology depth condition sets [ T [min,Tmax]＝[1,2]The number of the lines which are connected with the single bus in the way of breaking at most is set Dmax2; line open/close combination number condition setting [ N ]min,Nmax]＝[1,2]；
Expanding the operation mode set to generate 210 groups of modes according to the conditions of the rule base;
generating 12 groups of modes by the island detection and short-circuit safe operation mode set;
calculating short circuit current evaluation indexes, and screening and generating a short circuit safety preferred operation mode set, wherein the short circuit safety preferred operation mode set comprises 3 groups of modes:
serial number Name of mode Evaluation index of short circuit current
1 JSZ21230_JXX21230_2_JSZ21230_JXX21230_1 0.4866
2 JQH21230_JSZ21230_2_JQH21230_JSZ21230_1 0.5376
3 JHJ21230_JQH21230_2_JHJ21230_JQH21230_1 0.5428
So far, 3 modes of the short-circuit safety preferred operation mode set are obtained through screening.
Based on the same inventive concept, the present application also provides an expert knowledge fused power grid short circuit safety intelligent decision system, as shown in fig. 2, comprising:
the short-circuit current exceeding bus acquisition module is used for calculating the short-circuit current according to the power flow data of the power grid basic operation mode and the transient stability model to acquire a short-circuit current exceeding bus;
the expert knowledge rule base generation module generates an expert knowledge rule base according to the power flow data of the power grid basic operation mode and the short-circuit current exceeding bus;
the extended operation mode set generation module generates an extended operation mode set according to the power grid basic operation mode trend data and the expert knowledge rule base;
the short-circuit safe operation mode set generation module is used for carrying out island detection and short-circuit current calculation check on the extended operation mode set according to the extended operation mode set and the transient stable model to generate a short-circuit safe operation mode set;
and the short-circuit safety preferred operation mode set generation module is used for calculating short-circuit safety evaluation indexes of the short-circuit safety operation mode set, generating a short-circuit safety preferred operation mode set through screening, selecting a short-circuit safety preferred operation mode from the short-circuit safety preferred operation mode set, and making a decision on the short-circuit safety operation of the power grid.
Preferably, the method further comprises the following steps: and the calculation analysis data selection module is used for selecting data in the load flow data file and the transient stability model file of the basic operation mode from the existing data. Compared with the prior art, the method and the system provided by the application have the beneficial effects that:
(1) the patent establishes a set of expert knowledge-fused power grid operation mode short circuit safety intelligent decision method, generates more comprehensive massive operation modes by automatically processing complex power grid information, and realizes intelligent power grid operation mode short circuit safety decision;
(2) the whole power grid operation mode short circuit safety intelligent decision process is divided into a plurality of clear layers, and the next layer utilizes the result of the previous layer, so that the decision process is a progressive decision process and an automatic operation mode optimization process is also realized;
(3) an expert knowledge rule base is provided and established, and the application of the rule base can effectively simulate an expert decision process to obtain a calculation result which is more in line with the actual power grid on one hand and reduce the sample processing quantity in the operation mode arrangement process on the other hand;
(4) the method has the advantages that the optimal indexes for establishing the short circuit safety decision of the power grid operation mode are provided, and through index screening, screening bases can be given clearly, so that operation mode personnel can make reference to the decision conveniently;
(5) the patent constructs a power grid operation mode short circuit safety intelligent decision-making system, the application of the patent can greatly reduce the actual workload and the calculation burden of workers, the rapidity, the comprehensiveness, the accuracy and the effectiveness of mode arrangement work are improved, the power grid calculation analysis means is enhanced, and the power grid safety operation level is improved. The problems that in the prior art, labor cost is high, the number of analysis samples is limited, practicability is poor, an optimization decision scheme is difficult to obtain and the like are solved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.

Claims (10)

1. An expert knowledge fused power grid short circuit safety intelligent decision method is characterized by comprising the following steps:
calculating short-circuit current according to the power flow data of the power grid basic operation mode and the transient stability model to obtain a short-circuit current exceeding bus;
generating an expert knowledge rule base according to the power flow data of the power grid basic operation mode and the short-circuit current exceeding bus;
generating an extended operation mode set according to the power grid basic operation mode trend data and the expert knowledge rule base;
according to the extended operation mode set and the transient stability model, carrying out island detection and short-circuit current calculation check on the extended operation mode set to generate a short-circuit safe operation mode set;
and calculating short circuit safety evaluation indexes of the short circuit safety operation mode set, generating a short circuit safety optimized operation mode set through screening, selecting a short circuit safety optimized operation mode from the short circuit safety optimized operation mode set, and making a decision on the short circuit safety operation of the power grid.
2. The method of claim 1, wherein the short-circuit current calculation is performed according to the power flow data of the power grid basic operation mode and the transient stability model to obtain the short-circuit current exceeding bus, and the method comprises the following steps:
calculating short-circuit current according to the power grid basic operation mode tidal current data, the transient stability model and the fault type, and obtaining the actual short-circuit current value of the AC/DC bus; the power grid basic operation mode trend data comprises the following steps: running mode tidal current data of a generator bus, an alternating current/direct current line, a transformer and FACTS equipment; the transient stability model comprises: the system comprises a generator, an excitation system, a power system stabilizer, a speed regulator, a prime mover, new energy, a direct current control system, power electronic equipment and a load transient stability model;
if the short-circuit current of the bus I meets the standard exceeding criterion Ishort.i＞μiIinter.iTaking the bus i as a short-circuit current exceeding bus; wherein Ishort.iIs the actual short-circuit current value of the AC/DC bus Iinter.iFor breaking the current value of the AC/DC bus i, muiThe interruption current coefficient.
3. The method of claim 1, wherein generating an expert knowledge rule base based on grid base operation mode power flow data and the short circuit current exceeding bus comprises:
setting a voltage range condition, a topological depth condition and the maximum number of the disconnected and connected lines of a single bus according to the short-circuit current exceeding bus;
taking the voltage range condition, the topological depth condition and the maximum number of the connected lines of the single bus as forward rule generating conditions;
collecting the lines meeting the forward rule generating condition to form a forward rule;
forming a generator associated line set, a transformer associated line set and a load associated line set according to the power flow data of the power grid basic operation mode;
forming a reverse rule according to a union set of the generator associated line set, the transformer associated line set and the load associated line set;
and the expert knowledge rule base is formed by the forward rule and the reverse rule together.
4. The method of claim 3, wherein setting a voltage range condition, a topology depth condition and a maximum number of open and close connected lines of a single bus according to the bus with the over-standard short-circuit current comprises:
setting the Voltage Range Condition (V)min,Vmax) In which V ismin、VmaxRespectively setting a lower limit and an upper limit of the voltage grade of the short-circuit current exceeding bus link line;
setting a topological depth condition [ T ]min,Tmax]Wherein T ismin、TmaxRespectively linking the lower limit and the upper limit of the stage number of the epitaxial line, T, of the short-circuit current exceeding the standardmin、TmaxIs an integer;
maximum number of disconnected and connected lines D for arranging single busmaxWherein D ismaxThe selection principle of the strip line is that D in the front is selected according to the sorting of the branch coefficients of the short-circuit current of the bus from large to smallmaxAnd (4) a line.
5. The method of claim 3, wherein forming the forward rule from the set of lines satisfying the forward rule generation condition comprises:
searching a line set L meeting forward rule generation conditions in basic operation mode trend dataFR，LFRThe number of lines is NLFR；
Line set LFRConstituting a forward rule.
6. The method of claim 3, wherein forming a generator-related line set, a transformer-related line set, and a load-related line set from grid-based operating mode power flow data comprises:
in the power flow data of the power grid basic operation mode, the lines directly linked with the generator buses are searched to form a generator associated line set LGen；
In the power flow data of the power grid basic operation mode, lines directly linked with the transformer are searched to form a transformer associated line set LTran；
In the power flow data of the power grid basic operation mode, the lines directly linked with the load buses are searched to form a load associated line set LLoad。
7. The method of claim 1, wherein generating an extended operation mode set based on grid base operation mode flow data and the expert knowledge rule base comprises:
removing the line set meeting the reverse rule from the line set meeting the forward rule to form an effective line set LEffe；
Setting the number condition of line breaking combination [ N ]min,Nmax]In which N isminRepresents the lower limit of the number of combinations, NmaxDenotes the upper limit of the number of combinations, Nmin、NmaxIs an integer;
using a combined operation method in mathematics from LEffeIn turn select Nmin,Nmin+1,…,NmaxA line forming a combined set S of line breaksLcut，SLcut＝{S1,S2,…,Si,…,SM}，SiCombined set S for indicating line breakLcutThe ith line on-off combination has the total number of
Figure FDA0002612266400000031
Wherein C represents a combinatorial operation in mathematics;
from SLcutIn the sequence, a line breaking combination S is selectedi(i is 1-M), and searching a line break combination S in the basic operation mode tide dataiCorresponding lines are set to be in an on-off state and stored as extended operation mode power flow data EOi(i is 1 to M) and the extended operation mode set is SEO＝{EO1,EO2,…,EOM}。
8. The method according to claim 1, wherein performing island detection and short-circuit current calculation check of the extended operation mode set according to the extended operation mode set and the transient stability model to generate a short-circuit safe operation mode set comprises:
respectively calculating load flow data of a basic operation mode and load flow data of an extended operation mode by applying a deep search algorithmiThe number of electrical islands (i: 1 to M) is denoted by NLand.Base、NLand.EOi(i＝1～M)；
Calculating the difference N of the electric islands in sequenceLand.Diffi＝NLand.EOi-NLand.BaseIf N is presentLand.DiffiWhen 0, the corresponding EOiBy island detection, EO to be detected by islandiForming a set of topologically efficient ways SRT；
Set S of topologically efficient waysRTEach EO ofiCalculating the short-circuit current to obtain the short-circuit current calculation result, and if the number of the short-circuit current exceeding the standard is 0, the corresponding EOiThrough the safety detection of short-circuit current, the EO detected through the safety detection of short-circuit currentiForm a short-circuit safe operation mode set SSCC。
9. The method according to claim 1, wherein the short-circuit safety evaluation index calculation is performed on the short-circuit safety operation mode set, and the short-circuit safety preferred operation mode set is generated by screening, and comprises the following steps:
to SSCCEO of (1)iCalculating the short circuit current evaluation Index (EO) in turni)，
Figure FDA0002612266400000032
Wherein Ishort.i、Iinter.i、μiRespectively showing an actual short-circuit current value, an AC/DC bus i interruption current value and an interruption current coefficient; p represents the total number of the bus bars; lambda [ alpha ]1And λ2Representing the weighting coefficient, to satisfy1+λ21 is ═ 1; max represents taking the maximum value;
for Index (EO)i) Sorting from small to large, taking the front NOptiEach Index (EO)i) Corresponding EOiForm a short-circuit safe preferred operation mode set SOpti。
10. The utility model provides a fuse electric wire netting short circuit safety intelligence decision-making system of expert's knowledge which characterized in that includes:
the short-circuit current exceeding bus acquisition module is used for calculating the short-circuit current according to the power flow data of the power grid basic operation mode and the transient stability model to acquire a short-circuit current exceeding bus;
the expert knowledge rule base generation module generates an expert knowledge rule base according to the power flow data of the power grid basic operation mode and the short-circuit current exceeding bus;
the extended operation mode set generation module generates an extended operation mode set according to the power grid basic operation mode trend data and the expert knowledge rule base;
the short-circuit safe operation mode set generation module is used for carrying out island detection and short-circuit current calculation check on the extended operation mode set according to the extended operation mode set and the transient stable model to generate a short-circuit safe operation mode set;
and the short-circuit safety preferred operation mode set generation module is used for calculating short-circuit safety evaluation indexes of the short-circuit safety operation mode set, generating a short-circuit safety preferred operation mode set through screening, selecting a short-circuit safety preferred operation mode from the short-circuit safety preferred operation mode set, and making a decision on the short-circuit safety operation of the power grid.
CN202010758192.8A 2020-07-31 2020-07-31 Expert knowledge fused power grid short circuit safety intelligent decision method and system Pending CN112101708A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112736871A (en) * 2020-12-24 2021-04-30 国网浙江省电力有限公司电力科学研究院 Method and system for finely checking short-circuit current of transformer substation of 220kV or below

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112736871A (en) * 2020-12-24 2021-04-30 国网浙江省电力有限公司电力科学研究院 Method and system for finely checking short-circuit current of transformer substation of 220kV or below

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