CN111276969A - Method, system and medium for calculating rotating reserve capacity of power system by considering coupling relation - Google Patents
Method, system and medium for calculating rotating reserve capacity of power system by considering coupling relation Download PDFInfo
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- CN111276969A CN111276969A CN202010124006.5A CN202010124006A CN111276969A CN 111276969 A CN111276969 A CN 111276969A CN 202010124006 A CN202010124006 A CN 202010124006A CN 111276969 A CN111276969 A CN 111276969A
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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
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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
- H02J3/48—Controlling the sharing of the in-phase component
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Abstract
The invention discloses a method, a system and a medium for calculating the rotating reserve capacity of an electric power system in consideration of a coupling relation, wherein the method comprises the steps of obtaining the operation parameters of the electric power system, substituting the operation parameters into a pre-established unit maximum adjustable output optimization calculation model in consideration of section safety constraints, and solving the unit maximum adjustable output optimization calculation model to obtain the maximum adjustable output of the current whole-network unit; according to the maximum adjustable output z of the current whole network unitmaxAnd actual contribution calculation takes into account the coupled relationship of the rotating reserve capacity of the power system. The invention combines the real-time maximum adjustable output of the unit, the safety constraint of the section and other data to calculate the power saving in real timeThe adjustable rotating reserve capacity and related data in different ranges and different time scales of a network, a regional power grid and the like enable a dispatcher to timely and accurately master the rotating reserve capacity of the power grid and serve for dispatching operation of the power grid.
Description
Technical Field
The invention relates to a power system dispatching operation analysis control technology, in particular to a power system rotating reserve capacity calculation method, a power system rotating reserve capacity calculation system and a power system rotating reserve capacity calculation medium considering a coupling relation.
Background
In the operation process of the power grid, in order to ensure safe and reliable operation of the power grid, a certain spare capacity, particularly a rotary spare capacity, needs to be reserved to deal with accidents such as power failure and the like. The currently common methods for determining the system rotation reserve capacity mainly include: 1. taking a fixed proportion (such as 7-10%) of the annual peak load of the system; 2. and taking the maximum capacity of the single machine in the system. The methods are very simple in calculation, and usually take the condition of meeting the safe and stable operation of the system as the primary consideration, but the coupling problem of the rotating reserve is not fully considered, and the influence of uncertain random factors of the system, such as the structural change of the system or the random property of the power generation of a new energy source unit, on the rotating reserve capacity is less considered.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the invention provides a method, a system and a medium for calculating the rotating reserve capacity of the power system in consideration of the coupling relation, and the method, the system and the medium are used for calculating the rotating reserve capacity of the provincial power grid, the regional power grid and other different ranges and different time scales in real time by combining data such as real-time maximum adjustable output of a unit, section safety constraint and the like, so that a dispatcher can timely and accurately master the rotating reserve capacity of the power grid and serve for dispatching and running of the power grid.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for calculating the rotating reserve capacity of an electric power system by considering the coupling relation comprises the following implementation steps:
1) acquiring operation parameters of the power system, and substituting the operation parameters into a pre-established unit maximum adjustable output optimization calculation model considering section safety constraints;
2) solving the maximum adjustable output optimization calculation model of the unit after the operation parameters are substituted, and obtaining the maximum adjustable output z of the current whole-network unitmax；
3) According to the maximum adjustable output z of the current whole network unitmaxAnd the actual force zrealAnd calculating the rotating reserve capacity of the power system considering the coupling relation.
Optionally, the functional expression of the pre-established unit maximum adjustable output optimization calculation model considering the section safety constraint, which is established in step 1), is as shown in formula (1):
M1:max z＝x1+x2+…+xl(1)
in the above formula, M1Representing a unit maximum adjustable output optimal calculation model considering section safety constraint, wherein z represents the sum of active outputs of the whole network unit, and M1The optimization target of (1) is that the sum of active power output of the whole network unit is the maximum z and the maximum xiAnd expressing the active output of the unit i, wherein i is 1,2, … l, l is the number of the units in the whole network, and the maximum adjustable output of the unit is optimized and calculated by the model M1The constraint conditions comprise the constraint of the upper limit and the lower limit of the active output of the unit and the safety constraint of the power transmission section of the power grid.
Optionally, the maximum adjustable output optimization calculation model M of the unit1The constraint condition of (2) is shown in the formula;
in the above formula, αkiRepresenting the sensitivity coefficient of the unit i output to section k, βkiRepresenting the sensitivity coefficient of the bus load j to the section k, bkRepresenting the transmission power limit, x, of the section kiIndicating the active output of unit i, yjRepresenting the active load, x, of bus ji maxThe capacity of the unit i is shown, i is 1,2, … l, j is 1,2, … m, k is 1,2, … n, l, m and n respectively show the number of the whole network unitsBus load and number of sections.
Optionally, the detailed steps of step 2) include:
2.1) the maximum adjustable output optimization calculation model of the unit after the operation parameters are substituted into a standard matrix;
2.2) solving by adopting a linear programming method aiming at the standard matrix to obtain the maximum adjustable output z of the current whole-network unitmax。
Optionally, the linear programming method employed in step 2.2) is a simplex method.
Optionally, the maximum adjustable output z of the current whole network unit in the step 3) is usedmaxAnd the actual force zrealThe calculation of the rotating reserve capacity of the power system considering the coupling relationship specifically includes: aiming at any unit i, the maximum adjustable output z of the front whole network unit is adjustedmaxAnd the actual output z of the unit irealAnd taking the difference value as the calculated rotating reserve capacity of the power system of the unit i in consideration of the coupling relation.
In addition, the present invention provides a power system rotation reserve capacity calculation system considering a coupling relationship, including:
the parameter substituting program unit is used for acquiring the operating parameters of the power system and substituting the operating parameters into a pre-established unit maximum adjustable output optimal calculation model considering the section safety constraint;
a model solving program unit for solving the maximum adjustable output optimal calculation model of the unit after the operation parameters are substituted to obtain the maximum adjustable output z of the current whole-network unitmax；
A capacity calculation program unit for calculating the maximum adjustable output z of the current whole network unitmaxAnd the actual force zrealAnd calculating the rotating reserve capacity of the power system considering the coupling relation.
In addition, the invention also provides a power system rotating reserve capacity calculation system considering the coupling relationship, which comprises a computer device programmed or configured to execute the steps of the power system rotating reserve capacity calculation method considering the coupling relationship.
In addition, the invention also provides a power system rotating reserve capacity calculation system considering the coupling relationship, which comprises a computer device, wherein a computer program which is programmed or configured to execute the power system rotating reserve capacity calculation method considering the coupling relationship is stored on a memory of the computer device.
Furthermore, the present invention also provides a computer-readable storage medium having stored thereon a computer program programmed or configured to execute the method for calculating a rotating reserve capacity of a power system in consideration of a coupling relationship.
Compared with the prior art, the invention has the following advantages:
1. the method of the invention fully considers the coupling relation of the rotating reserve, introduces the upper and lower limits of the active output of the unit and the safety constraint of the power transmission section of the power grid in establishing the optimization model of the maximum adjustable output of the unit, and ensures that the obtained rotating reserve capacity is more accurate than that of the traditional calculation method, thereby ensuring the safe and reliable operation of the power grid system.
2. The method has wide application objects, is suitable for different objects such as provincial power grids, regional power grids, sections and the like, and is also suitable for the rotating standby calculation of a large-scale wind-solar access system.
Drawings
FIG. 1 is a schematic diagram of a basic flow of a method according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a model for optimizing and calculating the maximum adjustable output of the unit according to the method of the embodiment of the present invention.
Detailed Description
As shown in fig. 1, the implementation steps of the method for calculating the rotating reserve capacity of the power system in consideration of the coupling relationship in the present embodiment include:
1) acquiring operation parameters of the power system, and substituting the operation parameters into a pre-established unit maximum adjustable output optimization calculation model considering section safety constraints;
2) solving the maximum adjustable output optimization calculation model of the unit after the operation parameters are substituted, and obtaining the maximum adjustable output z of the current whole-network unitmax；
3) According to the maximum adjustable output z of the current whole network unitmaxAnd the actual force zrealAnd calculating the rotating reserve capacity of the power system considering the coupling relation.
In this embodiment, the functional expression of the pre-established unit maximum adjustable output optimization calculation model considering the section safety constraint in step 1) is as shown in formula (1):
M1:max z＝x1+x2+…+xl(1)
in the above formula, M1Representing a unit maximum adjustable output optimal calculation model considering section safety constraint, wherein z represents the sum of active outputs of the whole network unit, and M1The optimization target of (1) is that the sum of active power output of the whole network unit is the maximum z and the maximum xiAnd expressing the active output of the unit i, wherein i is 1,2, … l, l is the number of the units in the whole network, and the maximum adjustable output of the unit is optimized and calculated by the model M1The constraint conditions comprise the constraint of the upper limit and the lower limit of the active output of the unit and the safety constraint of the power transmission section of the power grid.
In this embodiment, the maximum adjustable output of the unit is optimized and calculated by the model M1The constraint condition of (2) is shown in the formula;
in the above formula, αkiRepresenting the sensitivity coefficient of the unit i output to section k, βkiRepresenting the sensitivity coefficient of the bus load j to the section k, bkRepresenting the transmission power limit, x, of the section kiIndicating the active output of unit i, yjRepresenting the active load, x, of bus ji maxThe capacity of the unit i is shown, i is 1,2, … l, j is 1,2, … m, k is 1,2, … n, l, m, n respectively show the number of full-grid units, the load of the bus and the number of sections. In general, a plurality of power transmission sections or regional virtual sections exist in a practical large-scale power grid system, and even a plurality of sections exist. Therefore, the rotary standby calculation method mainly considers the safety constraint of the section. The influence of the output change of each unit on the active value of each section in the system is different, and the output change of each unit has different influences on the active value of each section in the systemOr both positive and negative differences, the above effect is usually reflected by the sensitivity coefficient of the unit to the section, for example, if the active value of the section i increases by 0.8MW or decreases by 0.8MW for every 1MW output of the unit j, the sensitivity coefficient of the unit to the section is αki0.8 or-0.8.
Referring to fig. 2 and formula (2), the maximum adjustable output optimization calculation model M of the unit1The constraints of (2) further include the following two types of constraints:
1. the safety constraint of the power transmission section of the power grid is in the form of:
2. the active output upper and lower limits of the unit are restricted in the following form:
the active output of each unit of the whole network does not exceed the capacity of the unit and is not a negative value, and the output upper limit of the new energy unit replaces the unit capacity by a predicted value, so the calculation method is also suitable for a system accessed by a large-scale new energy unit.
In this embodiment, the detailed steps of step 2) include:
2.1) the maximum adjustable output optimization calculation model of the unit after the operation parameters are substituted into a standard matrix;
2.2) solving by adopting a linear programming method aiming at the standard matrix to obtain the maximum adjustable output z of the current whole-network unitmax。
In this embodiment, the linear programming method adopted in step 2.2) is a simplex method.
In this embodiment, the maximum adjustable output z of the current whole-network unit in step 3) is obtainedmaxAnd the actual force zrealThe calculation of the rotating reserve capacity of the power system considering the coupling relationship specifically includes: aiming at any unit i, the maximum adjustable output z of the front whole network unit is adjustedmaxAnd the actual output z of the unit irealAnd taking the difference value as a meterAnd calculating the rotating reserve capacity of the power system of the unit i in consideration of the coupling relation.
The coupling characteristic of the rotating reserve capacity is mainly embodied in two aspects: the electric energy service provided by the unit is tightly coupled with the rotary standby service by being limited by the self operating characteristics of the unit; limited by network transmission capabilities, a tight coupling between spinning reserve and network security constraints. When the rotating reserve capacity is accurately calculated on the basis of safe and stable operation of the system, the coupling problem of the rotating reserve must be fully considered, namely two important constraints are introduced: the upper and lower limits of the generator set are restricted, and the actual output condition of the generator set is limited by the capacity of the generator set or the maximum or minimum technical output. The cross-section safety constraint influences that the requirement of network safety constraint must be considered for the arranged rotating spare capacity, and the problem that the reserved rotating spare capacity is unavailable due to network transmission limitation cannot occur. Generally, the output of the whole network unit cannot reach the unit capacity at the same time under the influence of section safety constraint.
In summary, in this embodiment, the adjustable rotation reserve capacities and related data of different ranges and different time scales of the provincial power grid, the regional power grid and the like are calculated in real time by combining the data of the unit such as the real-time maximum adjustable output, the section safety constraint, the sensitivity coefficient and the like, so that a dispatcher can timely and accurately master the rotation reserve capacity of the power grid to serve for the dispatching operation of the power grid.
In addition, the present embodiment also provides a power system rotation reserve capacity calculation system considering the coupling relationship, including:
the parameter substituting program unit is used for acquiring the operating parameters of the power system and substituting the operating parameters into a pre-established unit maximum adjustable output optimal calculation model considering the section safety constraint;
a model solving program unit for solving the maximum adjustable output optimal calculation model of the unit after the operation parameters are substituted to obtain the maximum adjustable output z of the current whole-network unitmax；
A capacity calculation program unit for calculating the maximum adjustable output z of the current whole network unitmaxAnd the actual force zrealCalculating testAnd the power system rotation reserve capacity considering the coupling relation.
In addition, the present embodiment further provides a coupling relationship considered power system rotating reserve capacity calculation system, which includes a computer device programmed or configured to execute the steps of the coupling relationship considered power system rotating reserve capacity calculation method of the present embodiment. In addition, the present embodiment further provides a coupling relationship considered power system rotating reserve capacity calculation system, which includes a computer device, where a memory of the computer device stores a computer program programmed or configured to execute the aforementioned coupling relationship considered power system rotating reserve capacity calculation method of the present embodiment. Furthermore, the present embodiment also provides a computer-readable storage medium, which stores thereon a computer program programmed or configured to execute the aforementioned power system rotating reserve capacity calculating method in consideration of the coupling relationship of the present embodiment.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A method for calculating the rotating reserve capacity of an electric power system by considering the coupling relation is characterized by comprising the following implementation steps:
1) acquiring operation parameters of the power system, and substituting the operation parameters into a pre-established unit maximum adjustable output optimization calculation model considering section safety constraints;
2) solving the maximum adjustable output optimization calculation model of the unit after the operation parameters are substituted, and obtaining the maximum adjustable output z of the current whole-network unitmax；
3) According to the maximum adjustable output z of the current whole network unitmaxAnd the actual force zrealAnd calculating the rotating reserve capacity of the power system considering the coupling relation.
2. The method for calculating the rotating reserve capacity of the power system in consideration of the coupling relationship according to claim 1, wherein the functional expression of the pre-established unit maximum adjustable output optimization calculation model considering the section safety constraint, established in the step 1), is as shown in formula (1):
M1:max z＝x1+x2+…+xl(1)
in the above formula, M1Representing a unit maximum adjustable output optimal calculation model considering section safety constraint, wherein z represents the sum of active outputs of the whole network unit, and M1The optimization target of (1) is that the sum of active power output of the whole network unit is the maximum z and the maximum xiAnd expressing the active output of the unit i, wherein i is 1,2, … l, l is the number of the units in the whole network, and the maximum adjustable output of the unit is optimized and calculated by the model M1The constraint conditions comprise the constraint of the upper limit and the lower limit of the active output of the unit and the safety constraint of the power transmission section of the power grid.
3. The method for calculating rotating reserve capacity of power system according to claim 2, wherein the model M for calculating maximum adjustable output of the unit is optimized1The constraint condition of (2) is shown in the formula;
in the above formula, αkiRepresenting the sensitivity coefficient of the unit i output to section k, βkiRepresenting the sensitivity coefficient of the bus load j to the section k, bkRepresenting the transmission power limit, x, of the section kiIndicating the active output of unit i, yjRepresenting the active load, x, of bus ji maxThe capacity of the unit i is shown, i is 1,2, … l, j is 1,2, … m, k is 1,2, … n, l, m, n respectively show the number of full-grid units, the load of the bus and the number of sections.
4. The coupling-considered power system rotating reserve capacity calculation method according to claim 1, wherein the detailed step of step 2) includes:
2.1) the maximum adjustable output optimization calculation model of the unit after the operation parameters are substituted into a standard matrix;
2.2) solving by adopting a linear programming method aiming at the standard matrix to obtain the maximum adjustable output z of the current whole-network unitmax。
5. The coupling-considered power system rotating reserve capacity calculation method according to claim 4, wherein the linear programming method adopted in the step 2.2) is a simplex method.
6. The method for calculating the rotating reserve capacity of the power system in consideration of the coupling relation as claimed in claim 1, wherein the step 3) is performed according to the maximum adjustable output z of the current grid-wide unitmaxAnd the actual force zrealThe calculation of the rotating reserve capacity of the power system considering the coupling relationship specifically includes: aiming at any unit i, the maximum adjustable output z of the front whole network unit is adjustedmaxAnd the actual output z of the unit irealAnd taking the difference value as the calculated rotating reserve capacity of the power system of the unit i in consideration of the coupling relation.
7. A power system rotating reserve capacity calculation system considering a coupling relationship, characterized by comprising:
the parameter substituting program unit is used for acquiring the operating parameters of the power system and substituting the operating parameters into a pre-established unit maximum adjustable output optimal calculation model considering the section safety constraint;
a model solving program unit for solving the maximum adjustable output optimal calculation model of the unit after the operation parameters are substituted to obtain the maximum adjustable output z of the current whole-network unitmax；
A capacity calculation program unit for calculating the maximum adjustable output z of the current whole network unitmaxAnd the actual force zrealAnd calculating the rotating reserve capacity of the power system considering the coupling relation.
8. A coupling-considered rotating reserve capacity calculation system for an electric power system, comprising a computer device, wherein the computer device is programmed or configured to perform the steps of the coupling-considered rotating reserve capacity calculation method for an electric power system according to any one of claims 1 to 6.
9. A coupling-considered rotating reserve capacity calculation system for an electric power system, comprising a computer device, wherein a memory of the computer device stores a computer program programmed or configured to perform the coupling-considered rotating reserve capacity calculation method for an electric power system according to any one of claims 1 to 6.
10. A computer-readable storage medium having stored thereon a computer program programmed or configured to perform the method of calculating rotational reserve capacity of an electric power system in consideration of a coupling relationship according to any one of claims 1 to 6.
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| CN112421609A (en) * | 2020-10-16 | 2021-02-26 | 中国南方电网有限责任公司 | Method, system, device and medium for measuring reserve capacity of power generation side of power system |
| CN112751366A (en) * | 2020-12-25 | 2021-05-04 | 深圳供电局有限公司 | Coordination control method for thermal power deep peak regulation grid-connection-leaving provincial units |
| CN113452017A (en) * | 2021-06-24 | 2021-09-28 | 广东电网有限责任公司 | Method, system, equipment and storage medium for analyzing available spare capacity of unit |
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Application publication date: 20200612 |