CN118399507A - Power grid standby optimization method, system and equipment considering emergency dispatching flexibility - Google Patents
Power grid standby optimization method, system and equipment considering emergency dispatching flexibility Download PDFInfo
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Abstract
The invention discloses a power grid standby optimization method, system and equipment considering emergency dispatching flexibility, which belong to the technical field of power automation, wherein the optimization method comprises the steps of analyzing the emergency standby demand; obtaining maximum and minimum limit constraints of the emergency standby based on the demand of the emergency standby, and obtaining association constraints between the conventional standby and the emergency standby; and introducing association constraint between normal standby and emergency standby, solving a pre-established unit planning output and standby distribution model, and obtaining unit planning output and standby optimization results of the power grid in a dispatching period. The invention aims at solving the problem that the power balance of the power grid in the dispatching time period cannot be met due to the insufficient flexible capability of the power grid in the dispatching time period, can effectively improve the climbing flexibility of the power grid in the dispatching time period, does not need to design a power generation plan with higher time resolution, and does not obviously increase the complexity of solving calculation.
Description
Technical Field
The invention belongs to the technical field of power automation, and particularly relates to a power grid standby optimization method, system and equipment considering emergency dispatching flexibility.
Background
With the development and development of new power systems and other concepts mainly composed of new energy, new energy in a partial area is becoming a developing subject. In the power grid with high new energy ratio, the power grid has the characteristics of dry climate and less vegetation, and frequent seasonal extreme weather such as sand storm, chill, storm and the like, steep rise and steep drop of new energy output in a short time (such as 5 minutes) are easy to cause, and the conventional standby reservation plan scheme taking 15 minutes or 1 hour as time resolution at present can not effectively cope with the situation of rapid change of new energy output in a short time, so that the effectiveness of taking emergency standby into consideration needs to be increased on the basis of the traditional scheduling plan. How to reserve abundant flexible emergency standby on the basis of considering economy and safety is a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a power grid standby optimization method, a system and equipment considering emergency dispatching flexibility, aiming at the problem that the power balance of a power grid in a dispatching period can not be met due to insufficient flexible capability of the power grid in the dispatching period in the prior art because of steep rising or steep falling of new energy in the dispatching period, and effectively improving the climbing flexibility of the power grid in the dispatching period.
In order to achieve the above purpose, the present invention has the following technical scheme:
in a first aspect, an embodiment of the present invention provides a power grid backup optimization method considering emergency dispatch flexibility, including:
analyzing the emergency standby demand;
obtaining maximum and minimum limit constraints of the emergency standby based on the demand of the emergency standby, and obtaining association constraints between the conventional standby and the emergency standby;
and introducing association constraint between normal standby and emergency standby, solving a pre-established unit planning output and standby distribution model, and obtaining unit planning output and standby optimization results of the power grid in a dispatching period.
As a preferred solution, the step of analyzing the demand of emergency backup is reserved in proportion to the load and the predicted value of new energy, and the expression is as follows:
In the method, in the process of the invention, For normal regular demand of the grid during period t,Negative normal standby demand reserved for the power grid in the t period; Is the serial number of the unit, For the collection of the machine sets,In order for the load set to be a set of loads,In order to be able to take time,Is a unitAt the position ofThe time period is provided for normal provision,Is a unitAt the position ofThe negative regular reserve provided by the time period,The serial number of the new energy unit is represented by W,Power for load d during period t; The power of the new energy unit w in the period t; The reserved proportion is reserved for the normal regulation of the load, The reserved proportion is reserved for the normal regulation of new energy,A proportion is reserved for the load negative normal standby,Reserve proportion for new energy negative routine standby;
In the method, in the process of the invention, Is the maximum positive deviation of the new energy unit w in the period t,Is the maximum negative deviation of the new energy unit w in the period t,For the deviation of the new energy unit w in the scene s in the period t,For the scene number,For a set of scenes to be a scene,Is a unitAt the position ofThe positive emergency reserve provided by the time period,Is a unitAt the position ofThe period provides a negative emergency back-up.
As a preferred solution, the step of obtaining maximum and minimum limit constraints of the emergency standby based on the demand of the emergency standby, and obtaining association constraints between the normal standby and the emergency standby, wherein the association constraint expressions between the normal standby and the emergency standby are as follows:
In the method, in the process of the invention, As the number of emergency back-up periods within a monotonic period,Normal regulation provided for the t-1 period unit i is provided; negative normal standby is provided for the t-1 period unit i.
As a preferred scheme, in the step of solving a pre-established unit planning output and standby allocation model to obtain unit planning output and standby optimization results of the power grid in a scheduling period, the unit planning output and standby allocation model considers unit operation cost and provides minimum total cost of standby to establish the following objective function:
wherein T represents a scheduling plan period; Indicating machine set In the time periodIs a force of the (a);、 Respectively represent the units In the time periodThe running cost and the starting cost of the (a) are compared,Is a unitSpare cost of (2);
The constraint conditions of the unit planning output and standby distribution model comprise:
the system balance constraint is expressed as follows:
In the method, in the process of the invention, A load number; d represents a load set; representing the predicted power of the load d in the t period; The predicted power of the new energy unit w in the t period is represented;
The unit combination constraint is expressed as follows:
wherein: The start-stop state of the unit i in the t period is represented, a value of 0 represents the unit stop, and a value of 1 represents the unit start-up; The start-stop state of the unit i-1 in the period t is represented; the machine set i is changed from the stop operation to the running state in the period t, the value is 1, and the rest period is 0; The method comprises the steps that a unit i is changed from operation to off-operation in a period t, the value is 1, and the rest period is 0; For the period number of the time period, Indicating that the unit i is in the periodThe operation is changed from the stop operation to the operation state,Indicating that the unit i is in the periodThe operation is changed into the off-line state,、Respectively representing the minimum continuous start-up time and the minimum continuous stop time of the unit;
the unit output limit value constraint is expressed as follows:
wherein: 、 respectively representing the minimum and maximum output of the unit i;
considering the flexibility constraint of emergency standby unit climbing, the expression is as follows:
In the method, in the process of the invention, Is a unitIn the time period-An output of 1; for the maximum ramp rate of the unit i, The maximum landslide rate of the unit i;
Network constraints, the expression is as follows:
In the method, in the process of the invention, Is the limit of the flow of the line or section l,For the transfer distribution factor of the unit i to the line or section l,For the transfer distribution factor of the load d to the line or section l,The transfer distribution factor of the new energy w to the line or the section l is obtained.
As a preferred scheme, in the step of introducing the association constraint between the conventional standby and the emergency standby, solving the pre-established unit planning output and standby distribution model to obtain the unit planning output and standby optimization result of the power grid in the dispatching period, a digital optimization technology CPLEX solver is adopted to solve the unit planning output and standby distribution model.
In a second aspect, an embodiment of the present invention further provides a power grid backup optimization system considering emergency dispatch flexibility, including:
the emergency standby demand analysis module is used for analyzing the emergency standby demand;
The emergency standby association constraint establishing module is used for obtaining the maximum limit constraint and the minimum limit constraint of the emergency standby based on the demand of the emergency standby and obtaining association constraint between the conventional standby and the emergency standby;
And the unit plan output and reserve distribution solving module is used for introducing the association constraint between the conventional reserve and the emergency reserve, and solving the pre-established unit plan output and reserve distribution model to obtain the unit plan output and reserve optimization result of the power grid in the dispatching period.
As a preferable scheme, the emergency standby demand analysis module is reserved in proportion by combining the load and the new energy predicted value, and the expression is as follows:
In the method, in the process of the invention, For normal regular demand of the grid during period t,Negative normal standby demand reserved for the power grid in the t period; Is the serial number of the unit, For the collection of the machine sets,In order for the load set to be a set of loads,The time period is represented by a time period,Is a unitAt the position ofThe time period is provided for normal provision,Is a unitAt the position ofThe negative regular reserve provided by the time period,The serial number of the new energy unit is represented by W,Power for load d during period t; The power of the new energy unit w in the period t; The reserved proportion is reserved for the normal regulation of the load, The reserved proportion is reserved for the normal regulation of new energy,A proportion is reserved for the load negative normal standby,Reserve proportion for new energy negative routine standby;
In the method, in the process of the invention, Is the maximum positive deviation of the new energy unit w in the period t,Is the maximum negative deviation of the new energy unit w in the period t,For the deviation of the new energy unit w in the scene s in the period t,For the scene number,For a set of scenes to be a scene,Is a unitAt the position ofThe positive emergency reserve provided by the time period,Is a unitAt the position ofThe period provides a negative emergency back-up.
As a preferred scheme, the association constraint expression between the normal standby and the emergency standby, which is established by the emergency standby association constraint establishing module, is as follows:
In the method, in the process of the invention, As the number of emergency back-up periods within a monotonic period,Normal regulation provided for the t-1 period unit i is provided; negative normal standby is provided for the t-1 period unit i.
As a preferred scheme, the unit planning output and reserve distribution solving module introduces association constraint between regular reserve and emergency reserve, solves a pre-established unit planning output and reserve distribution model, and when obtaining unit planning output and reserve optimization results of a power grid in a dispatching period, the unit planning output and reserve distribution model considers unit operation cost and provides minimum total cost of reserve to establish the following objective function:
wherein: t represents a scheduling plan period; Indicating machine set In the time periodIs a force of the (a);、 Respectively represent the units In the time periodThe running cost and the starting cost of the (a) are compared,Is a unitSpare cost of (2);
The constraint conditions of the unit planning output and standby distribution model comprise:
the system balance constraint is expressed as follows:
In the method, in the process of the invention, A load number; d represents a load set; representing the predicted power of the load d in the t period; The predicted power of the new energy unit w in the t period is represented;
The unit combination constraint is expressed as follows:
wherein: The start-stop state of the unit i in the t period is represented, a value of 0 represents the unit stop, and a value of 1 represents the unit start-up; The start-stop state of the unit i-1 in the period t is represented; the machine set i is changed from the stop operation to the running state in the period t, the value is 1, and the rest period is 0; The method comprises the steps that a unit i is changed from operation to off-operation in a period t, the value is 1, and the rest period is 0; For the period number of the time period, Indicating that the unit i is in the periodThe operation is changed from the stop operation to the operation state,Indicating that the unit i is in the periodThe operation is changed into the off-line state,、Respectively representing the minimum continuous start-up time and the minimum continuous stop time of the unit;
the unit output limit value constraint is expressed as follows:
wherein: 、 respectively representing the minimum and maximum output of the unit i;
considering the flexibility constraint of emergency standby unit climbing, the expression is as follows:
In the method, in the process of the invention, Is a unitIn the time period-An output of 1; for the maximum ramp rate of the unit i, The maximum landslide rate of the unit i;
Network constraints, the expression is as follows:
In the method, in the process of the invention, Is the limit of the flow of the line or section l,For the transfer distribution factor of the unit i to the line or section l,For the transfer distribution factor of the load d to the line or section l,The transfer distribution factor of the new energy w to the line or the section l is obtained.
In a third aspect, an embodiment of the present invention further provides an electronic device, including a processor and a memory, where the processor is configured to execute a computer program stored in the memory to implement the power grid backup optimization method considering the flexibility of emergency dispatch.
Compared with the prior art, the first aspect of the invention has at least the following beneficial effects:
According to the power grid reserve optimization method considering the emergency dispatching flexibility, the maximum limit constraint and the minimum limit constraint of the emergency reserve are established through analyzing the demand quantity of the emergency standby, the association constraint between the conventional reserve and the emergency reserve is further established, the association constraint between the conventional reserve and the emergency reserve is introduced in the process of solving the unit planning output and the reserve distribution model, and then the unit planning output and the reserve optimization result of the power grid in the dispatching period are obtained, so that the flexibility of the power grid is improved. Compared with the existing solving methods based on continuous time planning modeling and the like, the method increases the participation of a flexible unit through the contraction of the standby constraint, achieves the considerable effect of improving the flexibility of the power grid, and can more intuitively display the size of the flexible standby capability of the power grid. The method of the invention only increases the maximum and minimum limit constraints of emergency standby and the association constraint between conventional standby and emergency standby without changing the time resolution of scheduling plan programming, can be matched with the current actual scheduling operation condition, does not need to design a power generation plan with higher time resolution, and has remarkable practical value. According to the method, the unit planning output and the standby optimizing result of the power grid in the dispatching period can be obtained by only introducing the association constraint between the conventional standby and the emergency standby and solving the unit planning output and standby distributing model, the complexity of solving calculation is not obviously increased, the calculating efficiency is basically consistent with that of solving the conventional unit combining model, and the requirement of the operation timeliness of the power grid can be met.
It will be appreciated that the advantages of the second to third aspects may be found in the relevant description of the first aspect, and are not described in detail herein.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a power grid standby optimization method considering the flexibility of emergency dispatch in the embodiment of the invention;
FIG. 2 is a schematic diagram of the association between a normal standby and an emergency standby according to an embodiment of the present invention;
FIG. 3 is a block diagram of a power grid backup optimization system taking into account the flexibility of emergency dispatch in the embodiment of the invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
Considering the flexible climbing capability of the power system in a dispatching period is widely focused, but how to consider emergency reserve with higher flexibility on the basis of conventional reserve and analyze the interrelation of the emergency reserve is a technical problem to be further solved. In order to accurately describe the output change in the period, the existing continuous time modeling-based unit combination model is solved by establishing an electric power system operation optimization model on a continuous time domain, but the method generally needs to interpolate a continuous time track by adopting at least a 3-order Bernstein polynomial, which leads to a significant increase in the number of decision variables, a significant reduction in the calculation efficiency and difficulty in meeting the actual requirements. Therefore, the application provides an optimal scheduling method of the power system, which takes emergency standby reservation into account.
Specifically, referring to fig. 1, the power grid standby optimization method taking into consideration the flexibility of emergency dispatch according to the embodiment of the present invention includes:
s1, analyzing the emergency standby demand;
s2, obtaining maximum and minimum limit constraints of the emergency standby based on the demand of the emergency standby, and obtaining association constraints between the conventional standby and the emergency standby;
s3, introducing association constraint between normal standby and emergency standby, and solving a pre-established unit planning output and standby distribution model to obtain unit planning output and standby optimization results of the power grid in a dispatching period.
In a possible implementation manner, when the emergency standby demand analysis is performed in step S1, according to the rules of the national standard GB/T38969-2020 "rules of electric power system technology" that new energy such as wind power and solar power generation are installed in more areas, a certain load standby capacity needs to be additionally set by combining the output characteristics of the new energy and the proportion of participating in balance.
（1）
（2）
（3）
（4）
In the method, in the process of the invention,For normal regular demand of the grid during period t,Negative normal standby demand reserved for the power grid in the t period; Is the serial number of the unit, For the collection of the machine sets,In order for the load set to be a set of loads,In order to be able to take time,Is a unitAt the position ofThe time period is provided for normal provision,Is a unitAt the position ofThe negative regular reserve provided by the time period,The serial number of the new energy unit is represented by W,Power for load d during period t; The power of the new energy unit w in the period t; The reserved proportion is reserved for the normal regulation of the load, The reserved proportion is reserved for the normal regulation of new energy,A proportion is reserved for the load negative normal standby,Reserve proportion for new energy negative routine standby;
Aiming at emergency standby, the embodiment of the invention mainly generates S scenes based on emergency dispatching resolution through the statistical information of the new energy prediction errors, the new energy output in the scenes does not exceed the new energy prediction error interval obtained by the formulas (1) and (2), and the integral requirement of the power grid on emergency standby is obtained through the maximum value of the scenes.
（5）
（6）
（7）
（8）
In the method, in the process of the invention,Is the maximum positive deviation of the new energy unit w in the period t,Is the maximum negative deviation of the new energy unit w in the period t,For the deviation of the new energy unit w in the scene s in the period t,For the scene number,For a set of scenes to be a scene,Is a unitAt the position ofThe positive emergency reserve provided by the time period,Is a unitAt the position ofThe period provides a negative emergency back-up.
In one possible implementation, referring to fig. 2, the association constraint expression between the normal standby and the emergency standby established in step S2 is as follows:
（9）
（10）
（11）
（12）
In the method, in the process of the invention, As the number of emergency back-up periods within a monotonic period,Normal regulation provided for the t-1 period unit i is provided; negative normal standby is provided for the t-1 period unit i.
In one possible implementation, step S3 introduces association constraints between regular reserve and emergency reserve in the pre-established unit planning output and reserve distribution model, and builds a unit combination overall model that takes into account the emergency reserve constraints.
The following objective function is established with consideration of the unit operation cost and the minimum total cost for providing standby:
（13）
wherein T represents a scheduling plan period; Indicating machine set In the time periodIs a force of the (a);、 Respectively represent the units In the time periodThe running cost and the starting cost of the (a) are compared,Is a unitSpare cost of (2);
The constraint conditions include:
the system balance constraint is expressed as follows:
（14）
In the method, in the process of the invention, A load number; d represents a load set; representing the predicted power of the load d in the t period; The predicted power of the new energy unit w in the t period is represented;
The unit combination constraint is expressed as follows:
（15）
（16）
（17）
wherein: The start-stop state of the unit i in the t period is represented, a value of 0 represents the unit stop, and a value of 1 represents the unit start-up; The start-stop state of the unit i-1 in the period t is represented; the machine set i is changed from the stop operation to the running state in the period t, the value is 1, and the rest period is 0; The method comprises the steps that a unit i is changed from operation to off-operation in a period t, the value is 1, and the rest period is 0; For the period number of the time period, Indicating that the unit i is in the periodThe operation is changed from the stop operation to the operation state,Indicating that the unit i is in the periodThe operation is changed into the off-line state,、Respectively representing the minimum continuous start-up time and the minimum continuous stop time of the unit;
the unit output limit value constraint is expressed as follows:
（18）
（19）
wherein: 、 respectively representing the minimum and maximum output of the unit i;
considering the flexibility constraint of emergency standby unit climbing, the expression is as follows:
（20）
（21）
In the method, in the process of the invention, Is a unitIn the time period-An output of 1; for the maximum ramp rate of the unit i, The maximum landslide rate of the unit i;
Network constraints, the expression is as follows:
（22）
In the method, in the process of the invention, Is the limit of the flow of the line or section l,For the transfer distribution factor of the unit i to the line or section l,For the transfer distribution factor of the load d to the line or section l,The transfer distribution factor of the new energy w to the line or the section l is obtained.
The unit combination integral model considering emergency standby constraint belongs to a mixed integer programming problem, and can be solved by adopting optimization solving software.
Referring to fig. 3, the embodiment of the invention further provides a power grid standby optimization system considering emergency dispatching flexibility, which includes:
the emergency standby demand analysis module is used for analyzing the emergency standby demand;
The emergency standby association constraint establishing module is used for obtaining the maximum limit constraint and the minimum limit constraint of the emergency standby based on the demand of the emergency standby and obtaining association constraint between the conventional standby and the emergency standby;
And the unit plan output and reserve distribution solving module is used for introducing the association constraint between the conventional reserve and the emergency reserve, and solving the pre-established unit plan output and reserve distribution model to obtain the unit plan output and reserve optimization result of the power grid in the dispatching period.
In one possible implementation, the emergency standby demand analysis module performs reservation in proportion to the load and the new energy prediction value, where the expression is as follows:
In the method, in the process of the invention, For normal regular demand of the grid during period t,Negative normal standby demand reserved for the power grid in the t period; Is the serial number of the unit, For the collection of the machine sets,In order for the load set to be a set of loads,The time period is represented by a time period,Is a unitAt the position ofThe time period is provided for normal provision,Is a unitAt the position ofThe negative regular reserve provided by the time period,The serial number of the new energy unit is represented by W,Power for load d during period t; The power of the new energy unit w in the period t; The reserved proportion is reserved for the normal regulation of the load, The reserved proportion is reserved for the normal regulation of new energy,A proportion is reserved for the load negative normal standby,Reserve proportion for new energy negative routine standby;
In the method, in the process of the invention, Is the maximum positive deviation of the new energy unit w in the period t,Is the maximum negative deviation of the new energy unit w in the period t,For the deviation of the new energy unit w in the scene s in the period t,For the scene number,For a set of scenes to be a scene,Is a unitAt the position ofThe positive emergency reserve provided by the time period,Is a unitAt the position ofThe period provides a negative emergency back-up.
In one possible implementation, the association constraint expression between the regular standby and the emergency standby established by the emergency standby association constraint establishment module is as follows:
In the method, in the process of the invention, As the number of emergency back-up periods within a monotonic period,Normal regulation provided for the t-1 period unit i is provided; negative normal standby is provided for the t-1 period unit i.
In one possible implementation manner, the unit planning output and reserve allocation solving module introduces a correlation constraint between a normal reserve and an emergency reserve, solves a pre-established unit planning output and reserve allocation model, and when a unit planning output and reserve optimization result of a power grid in a scheduling period is obtained, the unit planning output and reserve allocation model considers the unit running cost and the minimum total cost for providing reserve to establish the following objective function:
wherein: t represents a scheduling plan period; Indicating machine set In the time periodIs a force of the (a);、 Respectively represent the units In the time periodThe running cost and the starting cost of the (a) are compared,Is a unitSpare cost of (2);
The constraint conditions of the unit planning output and standby distribution model comprise:
the system balance constraint is expressed as follows:
In the method, in the process of the invention, A load number; d represents a load set; representing the predicted power of the load d in the t period; The predicted power of the new energy unit w in the t period is represented;
The unit combination constraint is expressed as follows:
wherein: The start-stop state of the unit i in the t period is represented, a value of 0 represents the unit stop, and a value of 1 represents the unit start-up; The start-stop state of the unit i-1 in the period t is represented; the machine set i is changed from the stop operation to the running state in the period t, the value is 1, and the rest period is 0; The method comprises the steps that a unit i is changed from operation to off-operation in a period t, the value is 1, and the rest period is 0; For the period number of the time period, Indicating that the unit i is in the periodThe operation is changed from the stop operation to the operation state,Indicating that the unit i is in the periodThe operation is changed into the off-line state,、Respectively representing the minimum continuous start-up time and the minimum continuous stop time of the unit;
the unit output limit value constraint is expressed as follows:
wherein: 、 respectively representing the minimum and maximum output of the unit i;
considering the flexibility constraint of emergency standby unit climbing, the expression is as follows:
In the method, in the process of the invention, Is a unitIn the time period-An output of 1; for the maximum ramp rate of the unit i, The maximum landslide rate of the unit i;
Network constraints, the expression is as follows:
In the method, in the process of the invention, Is the limit of the flow of the line or section l,For the transfer distribution factor of the unit i to the line or section l,For the transfer distribution factor of the load d to the line or section l,The transfer distribution factor of the new energy w to the line or the section l is obtained.
Another embodiment of the present invention also proposes an electronic device comprising a processor and a memory, the processor being configured to execute a computer program stored in the memory to implement the grid backup optimization method taking into account the flexibility of the emergency dispatch.
Another embodiment of the present invention also proposes a computer readable storage medium storing at least one instruction which, when executed by a processor, implements the grid backup optimization method taking into account the flexibility of emergency dispatch.
The computer program comprises computer program code which may be in source code form, object code form, executable file or in some intermediate form, etc. The computer readable storage medium may include: any entity or device, medium, usb disk, removable hard disk, magnetic disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier wave signals, telecommunications signals, software distribution media, and the like capable of carrying the computer program code. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals. For convenience of description, the foregoing disclosure shows only those parts relevant to the embodiments of the present invention, and specific technical details are not disclosed, but reference is made to the method parts of the embodiments of the present invention. The computer readable storage medium is non-transitory and can be stored in a storage device formed by various electronic devices, and can implement the execution procedure described in the method according to the embodiment of the present invention.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flowchart and/or block of the flowchart illustrations and/or block diagrams, and combinations of flowcharts 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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. A power grid backup optimization method taking into account emergency dispatch flexibility, comprising:
analyzing the emergency standby demand;
obtaining maximum and minimum limit constraints of the emergency standby based on the demand of the emergency standby, and obtaining association constraints between the conventional standby and the emergency standby;
and introducing association constraint between normal standby and emergency standby, solving a pre-established unit planning output and standby distribution model, and obtaining unit planning output and standby optimization results of the power grid in a dispatching period.
2. The power grid reserve optimizing method considering emergency dispatch flexibility according to claim 1, wherein the step of analyzing the demand of emergency reserve is reserved in proportion to the load and the new energy forecast value, and the expression is as follows:
In the method, in the process of the invention, For normal regular demand of the grid during period t,Negative normal standby demand reserved for the power grid in the t period; Is the serial number of the unit, For the collection of the machine sets,In order for the load set to be a set of loads,In order to be able to take time,Is a unitAt the position ofThe time period is provided for normal provision,Is a unitAt the position ofThe negative regular reserve provided by the time period,The serial number of the new energy unit is represented by W,Power for load d during period t; The power of the new energy unit w in the period t; The reserved proportion is reserved for the normal regulation of the load, The reserved proportion is reserved for the normal regulation of new energy,A proportion is reserved for the load negative normal standby,Reserve proportion for new energy negative routine standby;
In the method, in the process of the invention, Is the maximum positive deviation of the new energy unit w in the period t,Is the maximum negative deviation of the new energy unit w in the period t,For the deviation of the new energy unit w in the scene s in the period t,For the scene number,For a set of scenes to be a scene,Is a unitAt the position ofThe positive emergency reserve provided by the time period,Is a unitAt the position ofThe period provides a negative emergency back-up.
3. The power grid reserve optimization method considering emergency dispatch flexibility according to claim 2, wherein the step of obtaining maximum and minimum limit constraints of the emergency reserve based on the demand of the emergency reserve, obtaining association constraints between the regular reserve and the emergency reserve, and the association constraint expression between the regular reserve and the emergency reserve is as follows:
In the method, in the process of the invention, As the number of emergency back-up periods within a monotonic period,Normal regulation provided for the t-1 period unit i is provided; negative normal standby is provided for the t-1 period unit i.
4. The power grid reserve optimization method considering emergency dispatching flexibility according to claim 3, wherein in the step of solving a pre-established unit planning output and reserve distribution model to obtain unit planning output and reserve optimization results of the power grid in a dispatching period, the unit planning output and reserve distribution model considers unit operation cost and provides minimum total cost of reserve to establish the following objective function:
wherein T represents a scheduling plan period; Indicating machine set In the time periodIs a force of the (a);、 Respectively represent the units In the time periodThe running cost and the starting cost of the (a) are compared,Is a unitSpare cost of (2);
The constraint conditions of the unit planning output and standby distribution model comprise:
the system balance constraint is expressed as follows:
In the method, in the process of the invention, A load number; d represents a load set; representing the predicted power of the load d in the t period; The predicted power of the new energy unit w in the t period is represented;
The unit combination constraint is expressed as follows:
wherein: The start-stop state of the unit i in the t period is represented, a value of 0 represents the unit stop, and a value of 1 represents the unit start-up; The start-stop state of the unit i-1 in the period t is represented; the machine set i is changed from the stop operation to the running state in the period t, the value is 1, and the rest period is 0; The method comprises the steps that a unit i is changed from operation to off-operation in a period t, the value is 1, and the rest period is 0; For the period number of the time period, Indicating that the unit i is in the periodThe operation is changed from the stop operation to the operation state,Indicating that the unit i is in the periodThe operation is changed into the off-line state,、Respectively representing the minimum continuous start-up time and the minimum continuous stop time of the unit;
the unit output limit value constraint is expressed as follows:
wherein: 、 respectively representing the minimum and maximum output of the unit i;
considering the flexibility constraint of emergency standby unit climbing, the expression is as follows:
In the method, in the process of the invention, Is a unitIn the time period-An output of 1; for the maximum ramp rate of the unit i, The maximum landslide rate of the unit i;
Network constraints, the expression is as follows:
In the method, in the process of the invention, Is the limit of the flow of the line or section l,For the transfer distribution factor of the unit i to the line or section l,For the transfer distribution factor of the load d to the line or section l,The transfer distribution factor of the new energy w to the line or the section l is obtained.
5. The power grid reserve optimization method considering emergency dispatching flexibility according to claim 4, wherein in the step of solving a pre-established unit planning output and reserve distribution model to obtain unit planning output and reserve optimization results of the power grid in a dispatching period, a digital optimization technology CPLEX solver is adopted to solve the unit planning output and reserve distribution model.
6. A grid backup optimization system that accounts for emergency dispatch flexibility, comprising:
the emergency standby demand analysis module is used for analyzing the emergency standby demand;
The emergency standby association constraint establishing module is used for obtaining the maximum limit constraint and the minimum limit constraint of the emergency standby based on the demand of the emergency standby and obtaining association constraint between the conventional standby and the emergency standby;
And the unit plan output and reserve distribution solving module is used for introducing the association constraint between the conventional reserve and the emergency reserve, and solving the pre-established unit plan output and reserve distribution model to obtain the unit plan output and reserve optimization result of the power grid in the dispatching period.
7. The grid backup optimization system considering emergency dispatch flexibility of claim 6, wherein the emergency backup demand analysis module reserves in proportion to the load and the new energy forecast value, and the expression is as follows:
In the method, in the process of the invention, For normal regular demand of the grid during period t,Negative normal standby demand reserved for the power grid in the t period; Is the serial number of the unit, For the collection of the machine sets,In order for the load set to be a set of loads,The time period is represented by a time period,Is a unitAt the position ofThe time period is provided for normal provision,Is a unitAt the position ofThe negative regular reserve provided by the time period,The serial number of the new energy unit is represented by W,Power for load d during period t; The power of the new energy unit w in the period t; The reserved proportion is reserved for the normal regulation of the load, The reserved proportion is reserved for the normal regulation of new energy,A proportion is reserved for the load negative normal standby,Reserve proportion for new energy negative routine standby;
In the method, in the process of the invention, Is the maximum positive deviation of the new energy unit w in the period t,Is the maximum negative deviation of the new energy unit w in the period t,For the deviation of the new energy unit w in the scene s in the period t,For the scene number,For a set of scenes to be a scene,Is a unitAt the position ofThe positive emergency reserve provided by the time period,Is a unitAt the position ofThe period provides a negative emergency back-up.
8. The grid backup optimization system taking into account emergency dispatch flexibility of claim 7, wherein the association constraint expression between regular and emergency backups established by the emergency backup association constraint establishment module is as follows:
In the method, in the process of the invention, As the number of emergency back-up periods within a monotonic period,Normal regulation provided for the t-1 period unit i is provided; negative normal standby is provided for the t-1 period unit i.
9. The power grid reserve optimization system considering emergency dispatching flexibility according to claim 8, wherein the unit planning output and reserve allocation solving module introduces a correlation constraint between a conventional reserve and an emergency reserve, solves a pre-established unit planning output and reserve allocation model, and when obtaining a unit planning output and reserve optimization result of a power grid in a dispatching period, the unit planning output and reserve allocation model establishes the following objective function considering unit operation cost and total cost for providing reserve:
wherein: t represents a scheduling plan period; Indicating machine set In the time periodIs a force of the (a);、 Respectively represent the units In the time periodThe running cost and the starting cost of the (a) are compared,Is a unitSpare cost of (2);
The constraint conditions of the unit planning output and standby distribution model comprise:
the system balance constraint is expressed as follows:
In the method, in the process of the invention, A load number; d represents a load set; representing the predicted power of the load d in the t period; The predicted power of the new energy unit w in the t period is represented;
The unit combination constraint is expressed as follows:
wherein: The start-stop state of the unit i in the t period is represented, a value of 0 represents the unit stop, and a value of 1 represents the unit start-up; The start-stop state of the unit i-1 in the period t is represented; the machine set i is changed from the stop operation to the running state in the period t, the value is 1, and the rest period is 0; The method comprises the steps that a unit i is changed from operation to off-operation in a period t, the value is 1, and the rest period is 0; For the period number of the time period, Indicating that the unit i is in the periodThe operation is changed from the stop operation to the operation state,Indicating that the unit i is in the periodThe operation is changed into the off-line state,、Respectively representing the minimum continuous start-up time and the minimum continuous stop time of the unit;
the unit output limit value constraint is expressed as follows:
wherein: 、 respectively representing the minimum and maximum output of the unit i;
considering the flexibility constraint of emergency standby unit climbing, the expression is as follows:
In the method, in the process of the invention, Is a unitIn the time period-An output of 1; for the maximum ramp rate of the unit i, The maximum landslide rate of the unit i;
Network constraints, the expression is as follows:
In the method, in the process of the invention, Is the limit of the flow of the line or section l,For the transfer distribution factor of the unit i to the line or section l,For the transfer distribution factor of the load d to the line or section l,The transfer distribution factor of the new energy w to the line or the section l is obtained.
10. An electronic device comprising a processor and a memory, the processor being configured to execute a computer program stored in the memory to implement the grid backup optimization method of any one of claims 1 to 5 that takes into account emergency dispatch flexibility.
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| CN104638662A (en) * | 2015-01-28 | 2015-05-20 | 广西大学 | Conventional unit adjusting power allocating method for coping with random fluctuation of multi-region new energy source power |
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| CN114243796A (en) * | 2021-12-13 | 2022-03-25 | 中国电力科学研究院有限公司 | Method and system for determining regional reserved reserve capacity of regional interconnected power grid |
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