CN112165093B - Core bottom-protecting net rack construction method and system based on large power grid - Google Patents

Core bottom-protecting net rack construction method and system based on large power grid Download PDF

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CN112165093B
CN112165093B CN202011114552.7A CN202011114552A CN112165093B CN 112165093 B CN112165093 B CN 112165093B CN 202011114552 A CN202011114552 A CN 202011114552A CN 112165093 B CN112165093 B CN 112165093B
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guaranteed
power
load
users
base
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CN112165093A (en
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孙志媛
刘默斯
张炜
李明珀
张翌晖
宋益
窦骞
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • 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
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2111/00—Details relating to CAD techniques
    • G06F2111/04—Constraint-based CAD
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/04—Power grid 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
    • 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]

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Abstract

The invention discloses a core bottom-protecting net rack construction method and a system based on a large power grid, wherein the method comprises the following steps: reading the calculation data of the typical operation mode of the power grid; analyzing the calculation data of the typical operation mode of the power grid to obtain a bottom-guaranteed load range; determining all bottom-guaranteed users in the bottom-guaranteed load range, and acquiring the bottom-guaranteed load quantity of each bottom-guaranteed user in all the bottom-guaranteed users from the calculation data of the typical operation mode of the power grid; determining the output of the guaranteed-under power supply utilized by each guaranteed-under user in all guaranteed-under users based on the guaranteed-under load quantity and the power supply constraint condition of each guaranteed-under user in all guaranteed-under users; and based on the guaranteed-bottom power output utilized by each guaranteed-bottom user in all guaranteed-bottom users, searching a typical operation mode of the power grid by using a mathematical optimization algorithm, and constructing a core guaranteed-bottom grid frame formed by all guaranteed-bottom users. The embodiment of the invention can ensure the accuracy and the high efficiency of the process of constructing the core bottom-protecting net rack under the condition of a given power grid operation mode.

Description

Core bottom-protecting net rack construction method and system based on large power grid
Technical Field
The invention relates to the technical field of electric power, in particular to a core bottom-protecting net rack construction method and system based on a large power grid.
Background
In order to effectively cope with the electric power safety risk under extreme conditions, perfect the electric power system emergency plans under various disaster conditions, ensure the continuous power supply and the quick power restoration of important users under extreme conditions, and reduce the risk of the complete stop of the important users under extreme operation conditions, in recent years, governments of various countries begin to construct a guaranteed-base power grid as a national strategy. The bottom-protected power grid is a set of key circuits and core network structures which are necessary for ensuring that a power supply can safely transmit power to important loads and quickly recover power supply capacity after disasters and the like under special conditions. Aiming at the problem of scientifically constructing a bottom-guaranteed power grid, how to accurately and efficiently determine the optimal scheme of a core bottom-guaranteed network frame of a large power grid on the basis of any operation mode given by a user so as to ensure the safety and reliability of power grid operation is a technical bottleneck to be solved urgently at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a core bottom-protecting net rack construction method and system based on a large power grid, which can ensure the accuracy and high efficiency of the core bottom-protecting net rack construction process under the condition of setting a power grid operation mode and have better practical value.
In order to solve the above problems, the invention provides a core bottom-protecting grid frame construction method based on a large power grid, which comprises the following steps:
reading the calculation data of the typical operation mode of the power grid;
analyzing the calculation data of the typical operation mode of the power grid to obtain a bottom-guaranteed load range;
determining all the guaranteed-base users in the guaranteed-base load range, and acquiring the guaranteed-base load quantity of each guaranteed-base user in all the guaranteed-base users from the power grid typical operation mode calculation data;
determining the guaranteed-under power output utilized by each guaranteed-under user in all guaranteed-under users based on the guaranteed-under load quantity and the power constraint condition of each guaranteed-under user in all guaranteed-under users;
and searching a typical operation mode of the power grid by using a mathematical optimization algorithm based on the guaranteed-bottom power output utilized by each guaranteed-bottom user in all the guaranteed-bottom users, and constructing a core guaranteed-bottom grid frame formed by all the guaranteed-bottom users.
Optionally, the power constraint condition is:
Figure BDA0002727826410000021
wherein, PiIs the active output, Q, of the ith generatoriIs the reactive power of the ith generator, uiFor the ith generating set to incorporate the state quantity of the bottom-guaranteed power supply, iPthe lower active power limit for the ith generator,
Figure BDA0002727826410000022
the upper limit of active power for the ith generator, iQthe lower limit of reactive power for the ith generator,
Figure BDA0002727826410000023
is the upper limit of reactive power, Ω, of the ith generatorgIs a generator bus set.
Optionally, the searching for the typical operation mode of the power grid by using the mathematical optimization algorithm, and the constructing of the core bottom-preserving network frame formed by all bottom-preserving users includes:
calculating the load flow betweenness index of each power transmission line in a typical operation mode of a power grid;
and determining an optimal communication path between each guaranteed-base user in all guaranteed-base users and the output of the corresponding guaranteed-base power supply based on a model connectivity constraint condition and the power flow index of each power transmission line.
Optionally, the calculation formula of the load flow betweenness index is as follows:
Figure BDA0002727826410000024
wherein S ismIs the actual output of the generator m, SnIs the actual load capacity, P, of the load node nij,mFlow, P, provided for m pairs of lines ij of the generatorij,nFlow, P, provided for load node n to line ijnFor node flows of load nodes n, PijActive power, P, flowing for line ijLnFor the active load of the load node n,
Figure BDA0002727826410000025
assigning matrix A to reverse orderumnInverse matrix of, PGmAnd G is the active output of the generator m, G is the set of all generators, and L is the set of all load nodes.
Optionally, the constraint condition of model connectivity is:
Figure BDA0002727826410000026
fij≤|Ωd|xij
wherein f isijIs a virtual current, f, flowing from node i to node j via line ijjiFor a virtual current, Ω, flowing from node j to node i via line jibIs the set of all the buses in the model, ΩdSet of all guaranteed users in the model, AsIs the set of all lines in the model, r is the generator node, xijThe state quantities in the core net bottom rack exist for the line ij.
In addition, an embodiment of the present invention further provides a core bottom-protecting grid frame construction system based on a large power grid, where the system includes:
the reading module is used for reading the calculation data of the typical operation mode of the power grid;
the analysis module is used for analyzing the calculation data of the typical operation mode of the power grid to obtain a bottom load protection range;
the acquisition module is used for determining all the guaranteed-base users in the guaranteed-base load range and acquiring the guaranteed-base load quantity of each guaranteed-base user in all the guaranteed-base users from the power grid typical operation mode calculation data;
a determining module, configured to determine, based on the guaranteed base load quantity and the power constraint condition of each guaranteed base user of all guaranteed base users, a guaranteed base power output utilized by each guaranteed base user of all guaranteed base users;
and the building module is used for searching a typical operation mode of the power grid by using a mathematical optimization algorithm based on the guaranteed-bottom power output utilized by each guaranteed-bottom user in all the guaranteed-bottom users, and building a core guaranteed-bottom grid frame formed by all the guaranteed-bottom users.
Optionally, the power constraint condition is:
Figure BDA0002727826410000031
wherein, PiIs the active output, Q, of the ith generatoriIs the reactive power of the ith generator, uiFor the ith generating set to incorporate the state quantity of the bottom-guaranteed power supply, iPthe lower active power limit for the ith generator,
Figure BDA0002727826410000032
the upper limit of active power for the ith generator, iQthe lower limit of reactive power for the ith generator,
Figure BDA0002727826410000033
is the upper limit of reactive power, Ω, of the ith generatorgIs a generator bus set.
Optionally, the building module is configured to calculate a load flow betweenness index of each power transmission line in a typical operation mode of a power grid; and determining an optimal communication path between each guaranteed-base user in all guaranteed-base users and the output of the corresponding guaranteed-base power supply based on model connectivity constraint conditions and the power flow index of each power transmission line.
Optionally, the calculation formula of the load flow betweenness index is as follows:
Figure BDA0002727826410000041
wherein S ismIs the actual output of the generator m, SnIs the actual load capacity, P, of the load node nij,mFlow, P, provided for m pairs of lines ij of the generatorij,nFlow, P, provided for load node n to line ijnFor node flows of load nodes n, PijActive power, P, flowing for line ijLnFor the active load of the load node n,
Figure BDA0002727826410000042
assigning matrix A to reverse orderumnInverse matrix of, PGmAnd G is the active output of the generator m, G is the set of all generators, and L is the set of all load nodes.
Optionally, the constraint condition of model connectivity is:
Figure BDA0002727826410000043
fij≤|Ωd|xij
wherein f isijIs a virtual current, f, flowing from node i to node j via line ijjiFor a virtual current, Ω, flowing from node j to node i via line jibIs the set of all the buses in the model, ΩdSet of all guaranteed users in the model, AsIs the set of all lines in the model, r is the generator node, xijThe state quantities in the core net bottom rack exist for the line ij.
In the embodiment of the invention, the calculation data generated in the given power grid operation mode is analyzed, and the relevant operation parameters are extracted by combining the inherent user information and the power supply information of the given power grid operation mode, so that the accuracy and the high efficiency of the core bottom-protecting network frame in the automatic generation process can be ensured, the scientific decision of the core bottom-protecting network frame is ensured, and the method has better practical value.
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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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a core bottom-protecting grid frame construction method based on a large power grid according to an embodiment of the present invention;
fig. 2 is a schematic composition diagram of a core bottom-protecting grid frame construction system based on a large power grid according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for constructing a core bottom-preserving grid structure based on a large power grid according to an embodiment of the present invention, where the method includes the following steps:
s101, reading the calculation data of the typical operation mode of the power grid;
in the embodiment of the present invention, the power grid typical operation mode calculation data actually includes power flow calculation data and stability calculation data, where the power flow calculation data is obtained by introducing basic grid model data formed in the power grid typical operation mode into a set power grid power flow calculation model for calculation, and similarly, the stability calculation data is obtained by introducing basic grid model data formed in the power grid typical operation mode into a set power grid stability calculation model for calculation.
S102, analyzing the calculation data of the typical operation mode of the power grid to obtain a guaranteed base load range;
in the embodiment of the invention, the distribution of the voltages of all the buses in the power grid in the typical operation mode of the power grid can be determined based on the load flow calculation data, partial buses with voltage values within an allowable range are obtained from the distribution, meanwhile, the partial buses are screened based on the stable calculation data, namely, one or more buses with stability lower than a preset threshold value in the partial buses are removed, and finally, a bottom load protection range is determined.
S103, determining all warranty users in the warranty load range, and acquiring the warranty load quantity of each warranty user in all the warranty users from the power grid typical operation mode calculation data;
in the embodiment of the present invention, since a power technician has previously specified all guaranteed-end users in a typical operation mode of a power grid, and each guaranteed-end user in the all guaranteed-end users has unique identifier information, here, based on that a guaranteed-end load range includes guaranteed-end users and ordinary users, all guaranteed-end users with specific identifier information can be collected from the guaranteed-end load range, and the guaranteed-end load quantity of each guaranteed-end user in the all guaranteed-end users is directly called from the calculation data of the typical operation mode of the power grid, where the guaranteed-end load quantity actually includes an active load quantity and a reactive load quantity.
S104, determining the guaranteed-under power output utilized by each guaranteed-under user in all the guaranteed-under users based on the guaranteed-under load quantity and the power constraint condition of each guaranteed-under user in all the guaranteed-under users;
in the embodiment of the present invention, firstly, constraint conditions are set for the power output that each guaranteed-end user of all guaranteed-end users can use as follows:
Figure BDA0002727826410000061
wherein, PiIs the active output, Q, of the ith generatoriIs the reactive power of the ith generator, uiFor the ith generating set to incorporate the state quantity of the bottom-guaranteed power supply, iPthe lower active power limit for the ith generator,
Figure BDA0002727826410000062
the upper limit of active power for the ith generator, iQthe lower limit of reactive power for the ith generator,
Figure BDA0002727826410000063
is the upper limit of reactive power, Ω, of the ith generatorgIs a generator bus set.
And reading the operation parameters of each guaranteed-under power supply in all guaranteed-under power supplies in a typical operation mode of the power grid, wherein the operation parameters comprise a power name, an active output limit value, a reactive output limit value, a generator terminal voltage and the like, at the moment, one or more proper guaranteed-under power supplies are selected for each guaranteed-under user from all guaranteed-under power supplies by combining the line loss rate delta P of the 220kV main power grid according to the guaranteed-under load determined by power technicians from the guaranteed-under load quantity of each guaranteed-under user in the guaranteed-under users, and the output of each guaranteed-under power supply is adjusted to be the product of (1+ delta P) and the guaranteed-under load of the corresponding guaranteed-under user and is associated with the calculation result of the power flow medium index. It should be noted that, because the number of the guaranteed-base power supplies set in the actual operation process of the power grid is far less than the number of the guaranteed-base users, the guaranteed-base power supply matched by each guaranteed-base user of all the guaranteed-base users has an overlapping relationship with other guaranteed-base users, for example, the guaranteed-base user a is matched with the guaranteed-base power supply 1 and the guaranteed-base power supply 2, the guaranteed-base user B is matched with the guaranteed-base power supply 1 and the guaranteed-base power supply 3, and so on.
And S105, searching a typical operation mode of the power grid by using a mathematical optimization algorithm based on the guaranteed-bottom power output utilized by each guaranteed-bottom user in all the guaranteed-bottom users, and constructing a core guaranteed-bottom grid frame formed by all the guaranteed-bottom users.
(1) Calculating a power flow betweenness index of each power transmission line in a typical operation mode of a power grid, wherein a calculation formula of the power flow betweenness index is as follows:
Figure BDA0002727826410000071
Figure BDA0002727826410000072
wherein S ismIs the actual output of the generator m, SnIs the actual load capacity, P, of the load node nij,mFlow, P, provided for m pairs of lines ij of the generatorij,nFlow, P, provided for load node n to line ijnFor node flows of load nodes n, PijActive power, P, flowing for line ijLnFor the active load of the load node n,
Figure BDA0002727826410000073
assigning matrix A to reverse orderumnInverse matrix of, PGmFor the active output of generator m, G is the set of all generators, L is the set of all load nodes, Pn-mFor the power flow generated between the load node n and the generator m,
Figure BDA0002727826410000074
is the set of all load nodes connected to load node n. Note that min (S)m,Sn) Weights representing the unity tidal current medians by actual contribution S from generator mmActual load S with load node nnThe minimum value is obtained as the maximum available transmission power between the generator m and the load node n.
The tidal current index is an index for rating the importance degree of the line, the depth and the breadth of the comprehensive line in power transmission of a power grid are the depth and the breadth, the depth is the power transmission quantity born by each power generation load node pair, and the breadth is the quantity of the line utilized by different power generation load node pairs. In the embodiment of the invention, the contribution of each power transmission line to the whole-network tide transmission can be quantified by solving the obtained tide index of each power transmission line, and the tide index of each power transmission line is arranged based on the principle that the higher the tide index of the line is, the higher the importance degree of the line is, so that power technicians can select the power transmission lines which are as important as possible for the initial building, the strengthening maintenance and the upgrading and transformation of the core bottom-preserving net rack from the economical point of view.
(2) Determining an optimal communication path between each guaranteed-base user and the corresponding guaranteed-base power output based on a model connectivity constraint condition and the power flow index of each power transmission line, wherein the model connectivity constraint condition is as follows:
Figure BDA0002727826410000081
fij≤|Ωd|xij
in the formula (f)ijIs a virtual current, f, flowing from node i to node j via line ijjiFor a virtual current, Ω, flowing from node j to node i via line jibIs the set of all the buses in the model, ΩdSet of all guaranteed users in the model, AsIs the set of all lines in the model, r is the generator node, xijThe state quantities in the core net bottom rack exist for the line ij.
The implementation process of the invention is as follows: firstly, searching a typical operation mode of a power grid, and listing all communication paths formed between each insurance bottom user and a corresponding insurance bottom power supply in all the insurance bottom users; secondly, the importance degree of each communication path in all the communication paths can be sorted from large to small according to the tide betweenness index of each power transmission line, all the communication paths after sorting are sequentially screened, the optimal communication path which meets the model connectivity constraint condition and has higher importance degree is obtained, so that a core bottom-preserving network frame formed by all bottom-preserving users can be finally constructed, and the normal communication between each bottom-preserving user in all the bottom-preserving users and the corresponding bottom-preserving power supply is ensured.
In addition, based on the core bottom-preserving net rack obtained in step S105, the embodiment of the present invention further provides an optimization and safety and stability check of the core bottom-preserving net rack to ensure the operation support strength of the core bottom-preserving net rack, wherein:
the optimization process for the core bottom-preserving net rack is represented as follows: performing optimal configuration on reactive power output of the core bottom-protection net rack by adopting an existing optimal power flow model (the model takes minimum voltage deviation as a target function), wherein the optimal configuration comprises the configuration of adjusting a capacitor, low impedance, high impedance and reactive power output of each bottom-protection power supply so as to perform fine correction on power grid loss and active power output;
the safety and stability checking process of the optimized core bottom-protecting net rack is represented as follows: respectively calculating a power flow result under the condition that any 220kV line trips, a power flow result under the condition that any 500kV main transformer trips and a power flow result under the condition that any 500kV line trips by adopting the conventional N-1 static safety analysis rapid calculation method, and verifying that the optimized core bottom-preserving net rack has thermal stability according to the power flow results; correspondingly, the existing time domain simulation method is adopted to respectively verify that the time length of the system cuttable fault is 0.12s under the condition that any 220kV line trips, the time length of the system cuttable fault is 0.1s under the condition that any 500kV main transformer trips, and the time length of the system cuttable fault is 0.1s under the condition that any 500kV line trips, so that the optimized core bottom-protecting net rack is guaranteed to have dynamic stability.
Referring to fig. 2, fig. 2 shows a core bottom-protecting grid frame construction system based on a large power grid in an embodiment of the present invention, where the system includes:
the reading module 201 is used for reading the calculation data of the typical operation mode of the power grid;
the analysis module 202 is used for analyzing the calculation data of the typical operation mode of the power grid to obtain a guaranteed base load range;
an obtaining module 203, configured to determine all warranty users in the warranty load range, and obtain the number of warranty loads of each of the all warranty users from the power grid typical operation mode calculation data;
a determining module 204, configured to determine, based on the guaranteed base load quantity of each guaranteed base user of all guaranteed base users and a power constraint condition, a guaranteed base power output utilized by each guaranteed base user of all guaranteed base users, where the power constraint condition is:
Figure BDA0002727826410000091
in the formula, PiIs the active output, Q, of the ith generatoriIs the reactive power of the ith generator, uiFor the ith generating set to incorporate the state quantity of the bottom-guaranteed power supply, iPthe lower active power limit for the ith generator,
Figure BDA0002727826410000092
the upper limit of active power for the ith generator, iQthe lower limit of reactive power for the ith generator,
Figure BDA0002727826410000093
is the upper limit of reactive power, Ω, of the ith generatorgIs a generator bus set.
A building module 205, configured to search, by using a mathematical optimization algorithm, a typical operation mode of a power grid based on the guaranteed-under power output utilized by each guaranteed-under user of all the guaranteed-under users, and build a core guaranteed-under grid frame formed by all the guaranteed-under users.
Specifically, the building module 205 is configured to calculate a power flow betweenness index of each power transmission line in a typical operation mode of a power grid, where a calculation formula of the power flow betweenness index is as follows:
Figure BDA0002727826410000101
wherein S ismIs the actual output of the generator m, SnIs the actual load capacity, P, of the load node nij,mFlow, P, provided for m pairs of lines ij of the generatorij,nFlow, P, provided for load node n to line ijnFor node flows of load nodes n, PijActive power, P, flowing for line ijLnFor the active load of the load node n,
Figure BDA0002727826410000102
assigning matrix A to reverse orderumnInverse matrix of, PGmAnd G is the active output of the generator m, G is the set of all generators, and L is the set of all load nodes.
The building module 205 is further configured to determine an optimal communication path between each guaranteed-base user of all guaranteed-base users and the corresponding guaranteed-base power output based on a model connectivity constraint condition and the power flow index of each power transmission line, where the model connectivity constraint condition is:
Figure BDA0002727826410000103
fij≤|Ωd|xij
in the formula (f)ijIs a virtual current, f, flowing from node i to node j via line ijjiFor a virtual current, Ω, flowing from node j to node i via line jibIs the set of all the buses in the model, ΩdSet of all guaranteed users in the model, AsIs the set of all lines in the model, r is the power generationMachine node, xijThe state quantities in the core net bottom rack exist for the line ij.
For the specific implementation of each module in the system, please refer to the method flowchart and specific implementation content shown in fig. 1, which are not described herein again.
In the embodiment of the invention, the calculation data generated in the given power grid operation mode is analyzed, and the relevant operation parameters are extracted by combining the inherent user information and the power supply information of the given power grid operation mode, so that the accuracy and the high efficiency of the core bottom-protecting network frame in the automatic generation process can be ensured, the scientific decision of the core bottom-protecting network frame is ensured, and the method has better practical value.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
The core bottom-protecting net rack construction method and system based on the large power grid provided by the embodiment of the invention are described in detail, a specific example is adopted in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A core bottom-protecting net rack construction method based on a large power grid is characterized by comprising the following steps:
reading the calculation data of the typical operation mode of the power grid;
analyzing the calculation data of the typical operation mode of the power grid to obtain a bottom-guaranteed load range;
determining all the guaranteed-base users in the guaranteed-base load range, and acquiring the guaranteed-base load quantity of each guaranteed-base user in all the guaranteed-base users from the power grid typical operation mode calculation data;
determining the guaranteed-under power output utilized by each guaranteed-under user in all guaranteed-under users based on the guaranteed-under load quantity and the power constraint condition of each guaranteed-under user in all guaranteed-under users;
and searching a typical operation mode of the power grid by using a mathematical optimization algorithm based on the guaranteed-bottom power output utilized by each guaranteed-bottom user in all the guaranteed-bottom users, and constructing a core guaranteed-bottom grid frame formed by all the guaranteed-bottom users.
2. The core bottom-preserving grid structure building method based on the large power grid according to claim 1, wherein the power supply constraint condition is as follows:
Figure FDA0002727826400000011
wherein, PiIs the active output, Q, of the ith generatoriIs the reactive power of the ith generator, uiFor the ith generating set to incorporate the state quantity of the bottom-guaranteed power supply, iPthe lower active power limit for the ith generator,
Figure FDA0002727826400000012
the upper limit of active power for the ith generator, iQthe lower limit of reactive power for the ith generator,
Figure FDA0002727826400000013
is the upper limit of reactive power, Ω, of the ith generatorgIs a generator bus set.
3. The method for constructing the core bottom-preserving grid frame based on the large power grid according to claim 1, wherein the step of searching the typical operation mode of the power grid by using a mathematical optimization algorithm to construct the core bottom-preserving grid frame formed by all bottom-preserving users comprises the following steps:
calculating the load flow betweenness index of each power transmission line in a typical operation mode of a power grid;
and determining an optimal communication path between each guaranteed-base user in all guaranteed-base users and the output of the corresponding guaranteed-base power supply based on a model connectivity constraint condition and the power flow index of each power transmission line.
4. The core bottom-protecting grid structure construction method based on the large power grid as claimed in claim 3, wherein the calculation formula of the load flow betweenness index is as follows:
Figure FDA0002727826400000021
wherein S ismIs the actual output of the generator m, SnIs the actual load capacity, P, of the load node nij,mFlow, P, provided for m pairs of lines ij of the generatorij,nFlow, P, provided for load node n to line ijnFor node flows of load nodes n, PijActive power, P, flowing for line ijLnFor the active load of the load node n,
Figure FDA0002727826400000022
assigning matrix A to reverse orderumnInverse matrix of, PGmAnd G is the active output of the generator m, G is the set of all generators, and L is the set of all load nodes.
5. The large power grid-based core bottom-preserving grid structure building method according to claim 3, wherein the model connectivity constraint condition is as follows:
Figure FDA0002727826400000023
fij≤|Ωd|xij
wherein f isijIs a virtual current, f, flowing from node i to node j via line ijjiFor a virtual current, Ω, flowing from node j to node i via line jibIs the set of all the buses in the model, ΩdSet of all guaranteed users in the model, AsIs the set of all lines in the model, r is the generator node, xijThe state quantities in the core net bottom rack exist for the line ij.
6. A core bottom-protecting net rack construction system based on a large power grid is characterized by comprising:
the reading module is used for reading the calculation data of the typical operation mode of the power grid;
the analysis module is used for analyzing the calculation data of the typical operation mode of the power grid to obtain a bottom load protection range;
the acquisition module is used for determining all the guaranteed-base users in the guaranteed-base load range and acquiring the guaranteed-base load quantity of each guaranteed-base user in all the guaranteed-base users from the power grid typical operation mode calculation data;
a determining module, configured to determine, based on the guaranteed base load quantity and the power constraint condition of each guaranteed base user of all guaranteed base users, a guaranteed base power output utilized by each guaranteed base user of all guaranteed base users;
and the building module is used for searching a typical operation mode of the power grid by using a mathematical optimization algorithm based on the guaranteed-bottom power output utilized by each guaranteed-bottom user in all the guaranteed-bottom users, and building a core guaranteed-bottom grid frame formed by all the guaranteed-bottom users.
7. The large power grid-based core grid-protected architecture system according to claim 6, wherein the power supply constraints are:
Figure FDA0002727826400000031
wherein, PiIs the active output, Q, of the ith generatoriIs the reactive power of the ith generator, uiFor the ith generating set to incorporate the state quantity of the bottom-guaranteed power supply, iPthe lower active power limit for the ith generator,
Figure FDA0002727826400000032
the upper limit of active power for the ith generator, iQthe lower limit of reactive power for the ith generator,
Figure FDA0002727826400000033
is the upper limit of reactive power, Ω, of the ith generatorgIs a generator bus set.
8. The core bottom-protecting grid structure building system based on the large power grid according to claim 6, wherein the building module is used for calculating a power flow betweenness index of each power transmission line in a typical operation mode of the power grid; and determining an optimal communication path between each guaranteed-base user in all guaranteed-base users and the output of the corresponding guaranteed-base power supply based on model connectivity constraint conditions and the power flow index of each power transmission line.
9. The core bottom-protecting grid structure building system based on the large power grid as claimed in claim 8, wherein the calculation formula of the load flow betweenness index is as follows:
Figure FDA0002727826400000041
wherein S ismIs the actual output of the generator m, SnIs the actual load capacity, P, of the load node nij,mFlow, P, provided for m pairs of lines ij of the generatorij,nIs negativeLoad node n to the power flow, P, provided by line ijnFor node flows of load nodes n, PijActive power, P, flowing for line ijLnFor the active load of the load node n,
Figure FDA0002727826400000042
assigning matrix A to reverse orderumnInverse matrix of, PGmAnd G is the active output of the generator m, G is the set of all generators, and L is the set of all load nodes.
10. The large power grid-based core grid structure construction system according to claim 8, wherein the model connectivity constraints are:
Figure FDA0002727826400000043
fij≤|Ωd|xij
wherein f isijIs a virtual current, f, flowing from node i to node j via line ijjiFor a virtual current, Ω, flowing from node j to node i via line jibIs the set of all the buses in the model, ΩdSet of all guaranteed users in the model, AsIs the set of all lines in the model, r is the generator node, xijThe state quantities in the core net bottom rack exist for the line ij.
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