CN113852134B - Network limited capacity assessment method and device based on power grid operation constraint - Google Patents
Network limited capacity assessment method and device based on power grid operation constraint Download PDFInfo
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Classifications
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- 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 network limited capacity assessment method and device based on power grid operation constraint, wherein the method comprises the following steps: acquiring real-time operation data of a power grid; determining an objective function required for evaluating the network limited capacity of the power grid and a preset constraint condition; the objective function comprises maximizing the total generator set reserve capacity of the power grid, and the constraint conditions comprise upper and lower limit constraints of adjustable output of the generator set, speed constraint of adjustment of the generator set and a plurality of section constraints; and solving an objective function according to the real-time running data of the power grid and the constraint condition, thereby obtaining the real-time minimum network limited capacity of the power grid. According to the method, the maximum value of the total generator set reserve capacity of the power grid is accurately calculated based on the constraint of the sections, the output configuration strategy of each generator set under the maximum reserve capacity and the network limited capacity of each generator set are obtained, and at the moment, the total network limited capacity of the power grid is minimum, so that the power grid can be guided to be optimally scheduled.
Description
Technical Field
The invention relates to the technical field of operation and control of power systems, in particular to a network limited capacity assessment method and device based on power grid operation constraint.
Background
With the gradual perfection of power grid construction, the control principle of the power system is more and more, the control requirement is higher and more, and therefore the limitation of the power system is more and more. In order to keep the supply and demand in the actual operation of the power grid basically balanced, a sufficient standby capacity is generally required to be arranged in response to the possible power loss fault or the situation that the load is larger than the predicted amplitude of the current power system, but the contradiction between the operation standby demand of the current power system and the standby capacity deduction caused by various factors is more obvious, wherein the influence of the network constraint on the standby capacity of the power system is particularly prominent, so that the accurate evaluation of the deduction of the standby capacity under the network constraint is important to the standby capacity evaluation of the power system and the adjustment capability of the power grid standby.
The existing power grid reserve capacity deduction calculation method based on the top meter method does not consider the unit output with negative sensitivity to the sections in the calculation process, and cannot consider the cross influence among all network sections, so that the obtained power generation unit network limited capacity calculation result has larger error, the load supply capacity of the power system is difficult to accurately evaluate, and the safe and reliable supply of the system cannot be ensured.
Disclosure of Invention
Aiming at the technical problems, the invention provides a network limited capacity assessment method and device based on power grid operation constraint, which can accurately calculate and obtain a generator set output configuration strategy under the maximum standby capacity based on a plurality of section constraints, so as to obtain the minimum limited capacity of each generator set.
In view of this, in a first aspect, the present invention provides a network limited capacity assessment method based on grid operation constraints, comprising:
Acquiring real-time operation data of a power grid;
determining an objective function required for evaluating the network limited capacity of the power grid and a preset constraint condition; the objective function comprises maximizing the total generator set reserve capacity of the power grid, and the constraint conditions comprise upper and lower limit constraints of adjustable output of the generator set, speed constraint of adjustment of the generator set and a plurality of section constraints;
and solving the objective function according to the real-time running data of the power grid and the constraint condition, so as to obtain the real-time minimum network limited capacity of the power grid.
Optionally, the maximizing the total generator set standby capacity of the grid is expressed as:
Wherein i represents the number of the generator sets, n represents the number of the generator sets, Representing the real-time output of genset i, P i represents the genset i output when maximum backup capacity is provided.
Optionally, the section constraints are specifically:
Wherein i represents the number of the generator sets, n represents the number of the generator sets, The real-time output of the generator set i is represented, P i represents the output of the generator set i when the maximum standby capacity is provided, j represents the section number, m represents the section number,/>And A j represents the upper and lower limit values of the cross section j,/>, respectivelyThe real-time value of section j is represented, and G ij represents the sensitivity of genset i to section j.
Optionally, the upper and lower limit constraints of the adjustable output of the generator set are specifically:
Wherein i represents the number of the generator set, n represents the number of the generator set, P i represents the output force of the generator set when the maximum standby capacity is provided, And P i represent the upper and lower limits of the generator set i output, respectively.
Optionally, the generating set adjustment rate constraint is specifically:
-T·Vi≤Pi-Pi 0≤T·Vi,i＝1,2,…,n；
Wherein i represents the number of the generator set, n represents the number of the generator set, T represents the calling standby time limit, V i represents the climbing range of the generator set i in unit time, P i represents the output force of the generator set i when the maximum standby capacity is provided, And the real-time output of the generator set i is shown.
Optionally, the constraint further includes: the output adjustment constraint of the generator set is specifically as follows:
Pi-Pi 0>0；
Where i denotes the genset number, P i denotes the genset i out force when maximum backup capacity is provided, And the real-time output of the generator set i is shown.
In a second aspect, the present invention provides a network limited capacity assessment device based on grid operation constraints, comprising:
the acquisition module is used for acquiring real-time operation data of the power grid;
The determining module is used for determining an objective function required to be used for evaluating the network limited capacity of the power grid and a preset constraint condition; the objective function comprises maximizing the total generator set reserve capacity of the power grid, and the constraint conditions comprise upper and lower limit constraints of adjustable output of the generator set, speed constraint of adjustment of the generator set and a plurality of section constraints;
the evaluation module is used for solving the objective function according to the real-time operation data of the power grid and the constraint condition, so as to obtain the real-time minimum network limited capacity of the power grid;
optionally, the section constraints are specifically:
Wherein i represents the number of the generator sets, n represents the number of the generator sets, The real-time output of the generator set i is represented, P i represents the output of the generator set i when the maximum standby capacity is provided, j represents the section number, m represents the section number,/>And A j represents the upper and lower limit values of the cross section j,/>, respectivelyThe real-time value of section j is represented, and G ij represents the sensitivity of genset i to section j.
In a third aspect, the present invention provides a data processing apparatus comprising a processor coupled to a memory, the memory storing a program, the program being executable by the processor to cause the data processing apparatus to perform the network limited capacity assessment method of the first aspect based on grid operation constraints.
In a fourth aspect, the present invention also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a network limited capacity assessment method based on grid operation constraints as described in the first aspect above.
Compared with the prior art, the invention has the beneficial effects that:
The network limited capacity assessment method based on the power grid operation constraint adopts a global optimization algorithm, comprehensively considers full constraint adjustment to obtain the optimal solution of the generator set output providing the maximum standby capacity, further derives the minimum network limited capacity, can provide more accurate guiding information for power grid optimization scheduling, and ensures reliable power supply.
On the other hand, the complex constraint of multi-section coupling is introduced into the optimization model, so that the problem of neglecting the cross-section negative sensitivity unit and the cross influence among a plurality of network sections in the top-surface method is solved.
Correspondingly, the invention further provides a network limited capacity assessment device, equipment and a computer medium based on the power grid operation constraint.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a network limited capacity assessment method based on grid operation constraints provided by an embodiment of the present invention;
Fig. 2 is a block diagram of a network limited capacity assessment device based on a power grid operation constraint according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the prior art, the top meter method and the average sensitivity method are used for evaluating the limited condition of single sections one by one, and finally the network limited capacity sum is obtained based on simple algebraic addition and subtraction, but in the actual dispatching regulation and control process of the power grid, repeated adjustment is often needed between different coupling sections to achieve the state of unit output and load balance, the process is actually an optimization process based on multi-section coupling, and the local section sequencing logic used in the prior art cannot accurately evaluate the spare capacity of the power generation side.
In this regard, as shown in fig. 1, one embodiment of the present invention provides a network limited capacity assessment method based on a power grid operation constraint, including the steps of:
s1: and acquiring real-time operation data of the power grid.
In this embodiment, the power grid real-time operation data may be obtained by a power grid operation control system (Operation Control System, OCS), which specifically includes real-time output data of the generator set, line section data, and the like.
S2: determining an objective function required for evaluating the network limited capacity of the power grid and a preset constraint condition; the objective function comprises maximizing the total generator set reserve capacity of the power grid, and the constraint conditions comprise upper and lower limit constraints of adjustable output of the generator set, speed constraint of adjustment of the generator set and a plurality of section constraints.
In this embodiment, the minimum network limited deduction evaluation considering the real-time running reserve capacity of the power grid is actually an optimization problem of the maximum reserve capacity of the power grid total generator set under the constraint of multiple sections, so this embodiment proposes a reserve optimization model based on linear programming, whose objective function is to maximize the reserve capacity of the generator set, namely: the maximum standby capacity which can be regulated out of the generator set in the set time is specifically expressed as follows:
Wherein i represents the number of the generator sets, n represents the number of the generator sets, Representing the real-time output of the generator set i, P i represents the output of the generator set i when the maximum standby capacity is provided, it being understood that P i is a decision variable of the standby optimization model.
Considering that the standby capacity of the generator set is the largest, the network limited capacity is the smallest, so the minimum network limited capacity of the power system can be deduced through the optimization problem, and the method is specifically expressed as:
In the method, in the process of the invention, The upper limit of the output force of the generator set i is represented, T represents the standby time limit of the call, and V i represents the climbing range of the generator set i in unit time.
It will be appreciated that the present invention evaluates network limited capacity based on grid real-time operational constraint data, and therefore does not require an increase in power balance constraints in maximizing the generator set backup capacity calculation.
Specifically, constraint conditions of the standby optimization model provided in this embodiment include upper and lower limit constraints of adjustable output of the generator set, adjustment rate constraints of the generator set, and a plurality of section constraints.
Wherein, the section constraints are specifically expressed as:
wherein j represents a section number, and m represents the number of effective sections of the OCS system; and A j represents the upper and lower limit values of the cross section j,/>, respectively Representing the real-time value of the section j, wherein all three parameters can be read through an OCS system; g ij represents the sensitivity of the generator set i to the cross section j, and is read from the sensitivity of the driver set to the cross section.
The upper and lower limit constraints of the adjustable output of the generator set are specifically expressed as follows:
In the method, in the process of the invention, And P i respectively represent the upper and lower limits of the output force of the generator set i, namely the maximum and minimum output force adjustable by the generator set, specifically the upper and lower limits of the residual power output value of the generator set, and can be specifically read through an OCS system.
The generator set regulation rate constraint is specifically expressed as:
-T·Vi≤Pi-Pi 0≤T·Vi,i＝1,2,…,n；
The constraint is used for describing the maximum output and the minimum output of the generator set after the speed is regulated in a specified time; wherein T represents the calling standby time limit, and can be specifically set to 10 minutes or 30 minutes according to the running requirement of the power grid.
V i represents the climbing range of the generator set i in unit time, and in this embodiment, the variable V i unit is represented as MW/min, and specifically, the variable V i unit can be obtained by reading the set account data of the OCS system.
Specifically, to prevent the optimization problem from being solved, a relaxation variable may be added to the section constraint described above.
In another embodiment, consider that the emergency back-up is mainly to cope with the situation that high power shortage occurs and the system frequency is low; in an actual service scene, when the system has a large low cycle, the working behavior of a dispatcher is to immediately increase the output of a callable unit, rather than by firstly pressing the output of the unit down, releasing the section space and then adjusting the rest units.
Based on the above, the invention adds a new constraint condition in the standby optimization model: the output adjustment constraint of the generator set is specifically expressed as:
Pi-Pi 0>0；
Where i denotes the genset number, P i denotes the genset i out force when maximum backup capacity is provided, And the real-time output of the generator set i is shown.
After the constraint that the unit output is only increased and not decreased is added, the calculated standby point is the output which can be directly increased without adjusting and optimizing under the condition of the currently determined unit output and section load.
S3: and solving the objective function according to the real-time running data of the power grid and the constraint condition, so as to obtain the real-time minimum network limited capacity of the power grid.
The network limited capacity is specifically the backup capacity deduction of the power system under the network constraint, and the real-time minimum network limited capacity of the power grid can be obtained through calculation of the maximum generator set backup capacity.
From a microscopic point of view, the deduction of the spare capacity is quantized, so that the actual spare capacity of the power system can be accurately estimated; and the minimum network limited capacity estimated by the invention can provide effective support for optimizing the standby regulation scheme of the power grid on a macroscopic scale.
Compared with the existing power grid optimization model, the objective function and constraint conditions of the standby optimization model provided by the embodiment of the invention are linear, the constraint of a power flow equation is effectively reduced, and the decision variable of the model is only set to be the output of the starting generator set when the standby capacity is maximum, so that the solving process is simpler and faster, and the computing efficiency is higher.
According to the network limited capacity assessment method based on the power grid operation constraint, which is provided by the embodiment of the invention, the adjustable output of the generator set is comprehensively considered based on the current multi-section and the output of the generator set, so that the limited capacity of each generator set is obtained, the maximization of the standby capacity of the power system is realized, and the accuracy of the limited capacity result obtained by the model calculation is higher.
Referring to fig. 2, another embodiment of the present invention further provides a network limited capacity assessment device based on a power grid operation constraint, which includes an acquisition module 101, a determination module 102, and an assessment module 103.
The acquisition module 101 is used for acquiring real-time operation data of the power grid.
The determining module 102 is configured to determine an objective function required for evaluating a network limited capacity of the power grid, and a preset constraint condition; the objective function comprises maximizing the total generator set reserve capacity of the power grid, and the constraint conditions comprise upper and lower limit constraints of adjustable output of the generator set, speed constraint of adjustment of the generator set and a plurality of section constraints.
The evaluation module 103 is configured to solve the objective function according to the real-time operation data of the power grid and the constraint condition, so as to obtain a real-time minimum network limited capacity of the power grid.
The content of information interaction and execution process between the modules in the above-mentioned device, because the content is based on the same concept as the method embodiment of the first aspect of the present invention, the specific content can be referred to the description in the method embodiment of the present invention, and the description is omitted herein.
The above described embodiments of the apparatus are merely illustrative, wherein the modules illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may be distributed over a plurality of network elements. Some or all of the units may be selected according to actual needs to achieve the purpose of the method of this embodiment.
In a third aspect, the present invention provides a data processing apparatus comprising a processor coupled to a memory, the memory storing a program, the program being executable by the processor to cause the data processing apparatus to perform the network limited capacity assessment method of the first aspect based on grid operation constraints.
In a fourth aspect, the present invention also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a network limited capacity assessment method based on grid operation constraints as described in the first aspect above.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in the embodiments may be accomplished by computer programs to instruct related hardware, where the programs may be stored in a computer readable storage medium, and where the programs may include the processes of the embodiments of the methods described above when executed. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random-access Memory (Random Access Memory, RAM), or the like.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (4)
1. A network limited capacity assessment method based on grid operation constraints, comprising:
Acquiring real-time operation data of a power grid;
determining an objective function required for evaluating the network limited capacity of the power grid and a preset constraint condition; wherein the objective function includes maximizing the total genset backup capacity of the grid Wherein, the method comprises the steps of, wherein,Representing the number of the generator set,/>Representing the number of generator sets,/>Representing genset/>Real-time output,/>Representing genset/>, when maximum backup capacity is providedOutput; the constraint conditions comprise upper and lower limit constraints of adjustable output of the generator set; Wherein/>Representing the number of the generator set,/>Representing the number of generator sets,/>Representing genset/>, when maximum backup capacity is providedOutput,/>And/>Respectively represent the generator set/>Upper and lower limits of force; generating set adjustment rate constraint/>; Wherein/>Representing the number of the generator set,/>Representing the number of generator sets,/>Indicating call-out standby time limit,/>Representing genset/>Climbing range per unit time,/>Representing genset/>, when maximum backup capacity is providedOutput,/>Representing genset/>Real-time output; a plurality of section constraints; Wherein/>Representing the number of the generator set,/>Representing the number of generator sets,/>Representing genset/>Real-time output,/>Representing genset/>, when maximum backup capacity is providedOutput,/>Representing section number,/>Representing the number of sections,/>And/>Respectively represent the cross section/>Upper and lower limit value of/>Representing the section/>Is used to determine the real-time value of (c),Representing genset/>To the section/(I)Sensitivity of (2); generating set output adjustment constraint/>; Wherein/>Representing the number of the generator set,/>Representing genset/>, when maximum backup capacity is providedOutput,/>Representing genset/>Real-time output;
and solving the objective function according to the real-time running data of the power grid and the constraint condition, so as to obtain the real-time minimum network limited capacity of the power grid.
2. A network limited capacity assessment device based on grid operation constraints, comprising:
the acquisition module is used for acquiring real-time operation data of the power grid;
The determining module is used for determining an objective function required to be used for evaluating the network limited capacity of the power grid and a preset constraint condition; wherein the objective function includes maximizing the total genset backup capacity of the grid Wherein/>Representing the number of the generator set,/>Representing the number of generator sets,/>Representing genset/>Real-time output,/>Representing genset/>, when maximum backup capacity is providedOutput; the constraint condition comprises upper and lower limit constraint of adjustable output of the generator set/>; Wherein/>Representing the number of the generator set,/>Representing the number of generator sets,/>Representing genset/>, when maximum backup capacity is providedOutput,/>And/>Respectively represent the generator set/>Upper and lower limits of force; generating set adjustment rate constraint/>; Wherein/>Representing the number of the generator set,/>Representing the number of generator sets,/>Indicating call-out standby time limit,/>Representing genset/>Climbing range per unit time,/>Representing genset/>, when maximum backup capacity is providedOutput,/>Representing genset/>Real-time output; a plurality of section constraints; Wherein/>Representing the number of the generator set,/>Representing the number of generator sets,/>Representing genset/>Real-time output,/>Representing genset/>, when maximum backup capacity is providedOutput,/>Representing section number,/>Representing the number of sections,/>And/>Respectively represent the cross section/>Upper and lower limit value of/>Representing the section/>Is used to determine the real-time value of (c),Representing genset/>To the section/(I)Sensitivity of (2); generating set output adjustment constraint/>; Wherein/>Representing the number of the generator set,/>Representing genset/>, when maximum backup capacity is providedOutput,/>Representing genset/>Real-time output;
And the evaluation module is used for solving the objective function according to the real-time operation data of the power grid and the constraint condition, so as to obtain the real-time minimum network limited capacity of the power grid.
3. A data processing apparatus, comprising:
A processor coupled to a memory, the memory storing a program for execution by the processor to cause the data processing apparatus to perform the grid-operation constraint-based network limited capacity assessment method of claim 1.
4. A computer storage medium storing computer instructions for performing the network limited capacity assessment method based on grid operation constraints of claim 1.
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