Power grid day-ahead scheduling method and device considering frequency safety, and electronic equipment

Abstract

The invention relates to the technical field of power system scheduling and operation, and provides a power grid day-ahead scheduling method and device considering frequency safety and electronic equipment, and the method comprises the steps: initializing a pre-constructed power grid day-ahead scheduling model which is used for minimizing the cost of a power grid side; initializing a pre-constructed synchronous generator set power standby model, wherein the synchronous generator set power standby model is used for minimizing the cost of the synchronous generator set; establishing a master-slave game model by taking the power grid day-ahead scheduling model as an objective function of a master party and the synchronous generator set power standby model as an objective function of a slave party; and determining the frequency modulation excitation electricity price based on the established master-slave game model. According to the method, a pricing strategy based on the master-slave game is established to excite the synchronous generator set to actively participate in frequency modulation, so that the frequency safety of a power grid is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of power system dispatching and operation, and in particular to a power grid day-ahead dispatching method, device and electronic equipment taking frequency safety into consideration. Background Art

[0002] In the power system, synchronous generators play a vital role, not only providing continuous power supply, but also maintaining the frequency stability of the power grid through frequency regulation services. The stability of the power grid frequency is a key indicator of the reliability of the power system. Any deviation from the nominal frequency may lead to instability of the power system and even cause large-scale power outages.

[0003] Traditional power systems usually rely on the active power output of synchronous generators to regulate the grid frequency. These generators respond to the real-time needs of the grid by adjusting their output to counter load changes or fluctuations on the generation side. However, as power systems become increasingly complex, traditional frequency regulation methods face many challenges. For example, the expansion of the grid, the marketization of electricity, and the continuous growth of electricity demand have put forward higher requirements on the frequency regulation capabilities of synchronous generators.

[0004] In the day-ahead dispatching stage, grid operators need to formulate power generation plans for generators, including determining frequency regulation incentive electricity prices to encourage synchronous generators to participate in frequency regulation. Existing dispatching models often fail to fully consider the importance of frequency security, or lack effective strategies when formulating incentive electricity prices. This may result in synchronous generators lacking sufficient motivation to provide frequency regulation services, or being unable to effectively respond to fluctuations in grid frequency in actual operation. Summary of the invention

[0005] The present invention provides a method, device and electronic equipment for day-ahead dispatching of a power grid taking frequency safety into consideration, so as to solve the defect that the frequency safety of the power grid is not fully considered in the prior art. By establishing a pricing strategy based on the master-slave game, synchronous generator sets are encouraged to actively participate in frequency modulation, thereby ensuring the frequency safety of the power grid.

[0006] The present invention provides a power grid day-ahead dispatching method considering frequency safety, comprising: initializing a pre-constructed power grid day-ahead dispatching model, wherein the power grid day-ahead dispatching model is used to minimize the cost of the power grid, the cost of the power grid includes the no-load operation cost of a synchronous generator set, the power generation cost of the synchronous generator set and the frequency regulation incentive cost of the synchronous generator set, the frequency regulation incentive cost of the synchronous generator set is the product of the weight coefficient of the frequency regulation incentive cost and the frequency regulation incentive electricity price, and operation constraints are pre-set for the power grid dispatching day-ahead model, the operation constraints include the operation constraints of the synchronous generator set, the frequency regulation frequency safety constraints of the power grid after the accident and the incentive electricity price constraints of the power grid; initializing a pre-constructed power reserve model of the synchronous generator set, the power reserve model of the synchronous generator set is used to minimize the cost of the synchronous generator set, the cost of the synchronous generator set is the cost of the frequency regulation capacity reserve of the synchronous generator set minus the product of the power reserve amount of the synchronous generator set and the frequency regulation incentive electricity price; taking the power grid day-ahead dispatching model as the objective function of the master side and the power reserve model of the synchronous generator set as the objective function of the slave side, and establishing a master-slave game model; and determining the frequency regulation incentive electricity price based on the established master-slave game model.

[0007] According to a power grid day-ahead dispatching method considering frequency safety provided by the present invention, the frequency modulation incentive electricity price is determined based on an established master-slave game model, including: obtaining the optimal solution of the frequency modulation incentive electricity price through the power grid day-ahead dispatching model; determining the optimal solution of the power reserve amount of the synchronous generator set according to the optimal solution of the frequency modulation incentive electricity price and the power reserve model of the synchronous generator set; judging whether convergence has occurred according to the difference between the optimal solution of the power reserve amount and the weight coefficient of the frequency modulation incentive cost and a pre-set convergence threshold; if converged, terminating the iteration and outputting the optimal solution of the frequency modulation incentive electricity price; if not converged, setting the weight coefficient of the frequency modulation incentive cost equal to the optimal solution of the power reserve amount, and continuing to iterate to determine the frequency modulation incentive electricity price.

[0008] According to a power grid day-ahead dispatching method considering frequency safety provided by the present invention, the post-accident power grid frequency regulation safety constraint is set according to the decision power shortage, and the post-accident power grid frequency regulation safety constraint includes the post-accident power grid primary frequency regulation safety constraint and the post-accident power grid secondary frequency regulation safety constraint.

[0009] According to a power grid day-ahead scheduling method considering frequency safety provided by the present invention, the operating constraints also include renewable energy site operating constraints and power grid operating constraints; wherein the renewable energy site operating constraints include that the grid-connected power value of the renewable energy site is less than the power generation power value of the renewable energy site; and the power grid operating constraints include capacity constraints of transmission lines and power grid power balance constraints.

[0010] According to a method for day-ahead dispatching of a power grid taking frequency safety into consideration provided by the present invention, the dispatching of the power grid has a multi-stage characteristic, and the day-ahead dispatching model of the power grid is divided into a plurality of intraday time periods. The cost of the power grid includes the cost of the power grid in each intraday time period, and the cost of the synchronous generator set includes the cost of the synchronous generator set in each intraday time period. The operating constraints also include affine mapping constraints of decision variables, and the decision variables include the active output of the synchronous generator set and the generated power of the renewable energy station.

[0011] The present invention also provides a power grid day-ahead dispatching device taking frequency safety into consideration, comprising: a first initialization module, configured to initialize a pre-constructed power grid day-ahead dispatching model, wherein the power grid day-ahead dispatching model is used to minimize the cost of the power grid, the cost of the power grid includes the no-load operation cost of the synchronous generator set, the power generation cost of the synchronous generator set and the frequency regulation incentive cost of the synchronous generator set, the frequency regulation incentive cost of the synchronous generator set is the product of the weight coefficient of the frequency regulation incentive cost and the frequency regulation incentive electricity price, and operation constraints are pre-set for the power grid dispatching day-ahead model, the operation constraints include the operation constraints of the synchronous generator set, the frequency safety constraints of the power grid frequency regulation after the accident and the incentive electricity price constraints of the power grid; a second initialization module, configured to initialize a pre-built power reserve model of a synchronous generator set, the power reserve model of the synchronous generator set is used to minimize the cost of the synchronous generator set, the cost of the synchronous generator set is the cost of the frequency regulation capacity reserve of the synchronous generator set minus the product of the power reserve of the synchronous generator set and the frequency regulation incentive electricity price; an establishment module, configured to use the day-ahead dispatch model of the power grid as the objective function of the master side, the power reserve model of the synchronous generator set as the objective function of the slave side, and establish a master-slave game model; a determination module, configured to determine the frequency regulation incentive electricity price based on the established master-slave game model.

[0012] According to a power grid day-ahead dispatching device considering frequency safety provided by the present invention, the determination module is further configured to: obtain the optimal solution of the frequency modulation incentive electricity price through the power grid day-ahead dispatching model; determine the optimal solution of the power reserve amount of the synchronous generator set according to the optimal solution of the frequency modulation incentive electricity price and the power reserve model of the synchronous generator set; judge whether convergence is achieved according to the difference between the optimal solution of the power reserve amount and the weight coefficient of the frequency modulation incentive cost and a pre-set convergence threshold; if converged, end the iteration and output the optimal solution of the frequency modulation incentive electricity price; if not converged, make the weight coefficient of the frequency modulation incentive cost equal to the optimal solution of the power reserve amount, and continue to iterate to determine the frequency modulation incentive electricity price.

[0013] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements any of the above-mentioned methods for day-ahead scheduling of a power grid taking frequency safety into consideration.

[0014] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for day-ahead scheduling of a power grid taking frequency safety into consideration as described in any one of the above is implemented.

[0015] The present invention also provides a computer program product, comprising a computer program, which, when executed by a processor, implements any of the above-mentioned methods for day-ahead scheduling of a power grid taking frequency safety into consideration.

[0016] The method, device and electronic equipment for day-ahead dispatching of a power grid taking frequency safety into consideration provided by the present invention encourage synchronous generator sets to actively participate in frequency regulation by establishing a pricing strategy based on a master-slave game, thereby ensuring the frequency safety of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a flow chart of the method for day-ahead dispatching of a power grid taking frequency safety into consideration provided by the present invention.

[0019] Figure 2 It is a structural schematic diagram of a power grid day-ahead dispatching device considering frequency safety provided by the present invention.

[0020] Figure 3 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0023] The following is a brief explanation of the terms involved in the present invention.

[0024] Combine the following Figure 1-Figure 3 The present invention describes a method, device and electronic equipment for day-ahead scheduling of a power grid taking frequency safety into consideration.

[0025] Figure 1 : is a flow chart of a method for day-ahead dispatching of a power grid considering frequency safety provided by the present invention, such as Figure 1 As shown, the method includes the following: Step 101: Initialize a pre-built day-ahead dispatch model for a power grid.

[0026] In this embodiment, the day-ahead dispatch model of the power grid is used to minimize the cost of the power grid, and the cost of the power grid includes the no-load operation cost of the synchronous generator set, the power generation cost of the synchronous generator set, and the frequency regulation incentive cost of the synchronous generator set. The frequency regulation incentive cost of the synchronous generator set is the product of the weight coefficient of the frequency regulation incentive cost and the frequency regulation incentive electricity price. The day-ahead model of the power grid dispatch is pre-set with operation constraints, and the operation constraints include the operation constraints of the synchronous generator set, the frequency safety constraints of the power grid frequency regulation after the accident, and the incentive electricity price constraints of the power grid. According to actual needs, initializing the pre-built day-ahead dispatch model of the power grid may include automatically obtaining the parameters required by the model through the existing power system or by setting the user interface, preparing the environment required for the model operation, and the like. The incentive electricity price constraints of the power grid can be set according to the actual situation of the power grid operation, for example, the range or threshold of the incentive electricity price can be set for each time period.

[0027] The operating constraints of synchronous generator sets can be set according to the actual situation of synchronous generator sets. For example, they can include start-stop state constraints, environmental and regulatory constraints, maintenance and overhaul constraints, upper and lower limits of unit output, and climbing constraints. Taking the upper and lower limits of unit output and climbing constraints as an example, the set, number, and index of the intraday time periods considered are , and , the set, number and index of synchronous generator sets are , and . Synchronous generator set In the period The upper and lower limits of the unit output and the climbing constraints need to be met. The following formula can be used as a reference:

[0028] in, Indicates the start and stop status variable of the synchronous generator set. Indicates time period Synchronous generator sets The meritorious contribution. and It's the crew The lower and upper bounds of the active power, and They are the uphill climbing speed and the downhill climbing speed respectively.

[0029] In day-ahead dispatching, the power grid needs to decide the operating status of each device under normal operation and decide the frequency regulation incentive electricity price. When considering renewable energy stations and adjusting them in different time periods, the set, number and index of renewable energy stations are , and , the day-ahead dispatch model of the power grid can be modeled as follows:

[0030] in, and Synchronous generator sets The no-load operation cost and unit power generation cost, For time period Synchronous generator sets The weight coefficient of the frequency regulation incentive cost. In the above model, the variable The optimal solution is , Indicates the start and stop state variables of the synchronous generator set. Indicates time period Synchronous generator sets The meritorious contribution.

[0031] Step 102: Initialize a pre-built synchronous generator set power reserve model.

[0032] In this embodiment, the synchronous generator set power reserve model is used to minimize the cost of the synchronous generator set. The cost of the synchronous generator set is the cost of the synchronous generator set for frequency regulation capacity reserve minus the product of the power reserve of the synchronous generator set and the frequency regulation incentive electricity price. , its decision model for frequency regulation capacity reserve, that is, the synchronous generator power reserve model, can be modeled as follows:

[0033] in, , It is a synchronous generator set The upper limit of the power reserve, About The cost function is is the variable in the power grid day-ahead dispatch model The optimal solution of . In the above model, the variables The optimal solution is , It is a synchronous generator set The power reserve.

[0034] Step 103: Taking the day-ahead dispatch model of the power grid as the objective function of the master and the power reserve model of the synchronous generator set as the objective function of the slave, a master-slave game model is established.

[0035] In this embodiment, the master-slave game is a non-cooperative game model involving two participants, one as a leader (master) and the other as a follower (slave). In this model, the leader makes a decision first, and the follower makes its own optimal response after observing the leader's decision. This game model has the characteristics of asymmetry, dynamics, repeatability and learning.

[0036] Step 104: Determine the frequency regulation incentive electricity price based on the established master-slave game model.

[0037] In this embodiment, considering that the power grid and the synchronous generator set belong to different interest entities: the power grid first formulates an incentive electricity price and publishes it to the synchronous generator set, and then the synchronous generator set decides the power range of frequency regulation based on its own benefits. Through the master-slave game model, an equilibrium solution can be found through iteration, namely the Stackelberg-Nash equilibrium. In this equilibrium state, the power grid can purchase the required electricity at the lowest cost, and the generator set can also obtain the maximum benefit while providing frequency regulation services.

[0038] The power grid day-ahead dispatching method considering frequency security provided by the present invention encourages synchronous generator sets to actively participate in frequency modulation by establishing a pricing strategy based on master-slave game, thereby ensuring the frequency security of the power grid.

[0039] In some optional implementations, the frequency modulation incentive electricity price is determined based on an established master-slave game model, including: obtaining the optimal solution of the frequency modulation incentive electricity price through the power grid day-ahead dispatch model; determining the optimal solution for the power reserve of the synchronous generator set based on the optimal solution of the frequency modulation incentive electricity price and the power reserve model of the synchronous generator set; judging whether convergence has occurred based on the difference between the optimal solution of the power reserve and the weight coefficient of the frequency modulation incentive cost and a pre-set convergence threshold; if converged, terminating the iteration and outputting the optimal solution of the frequency modulation incentive electricity price; if not converged, setting the weight coefficient of the frequency modulation incentive cost equal to the optimal solution of the power reserve, and continuing to iterate to determine the frequency modulation incentive electricity price.

[0040] In this implementation, the convergence threshold can be set at the initialization stage. For example, the convergence threshold is set to , if the formula: If it is established, the iteration ends and the optimal solution of the frequency regulation incentive electricity price is output. Otherwise, let , continue to iterate to find the equilibrium solution. The difference between the optimal solution of the power reserve and the weight coefficient of the frequency modulation incentive cost is selected for convergence judgment, ensuring that the optimal solution of the weight coefficient and the power reserve gradually stabilizes during the iteration process. In addition, the convergence can also be judged based on data such as the difference between the iterative solutions.

[0041] In some optional implementations, the frequency safety constraints of the power grid frequency regulation after the accident are set according to the decision power shortage, and the frequency safety constraints of the power grid frequency regulation after the accident include the primary frequency safety constraints of the power grid after the accident and the secondary frequency safety constraints of the power grid after the accident. The primary frequency regulation and secondary frequency regulation are common frequency regulation methods of the power grid. In actual operation, if there are other frequency regulation methods in the power grid, the frequency safety constraints of the power grid frequency regulation can also be set according to the frequency regulation method.

[0042] In the power system, the frequency safety constraints of the primary frequency regulation of the power grid after an accident refer to a series of measures and technical requirements taken to maintain the power grid frequency stability within a safe range after a power grid accident. These constraints ensure that the power grid can quickly return to a stable state after a disturbance, preventing excessive frequency deviations from causing wider power outages or system collapse.

[0043] As an example, the primary frequency regulation security constraints of the power grid after the accident may include the power shortage in the power grid , it is necessary to satisfy the maximum frequency change rate constraint, the maximum frequency deviation constraint and the quasi-steady-state frequency deviation constraint, and their expressions can be as follows:

[0044] in, is the time of the lowest frequency point after the accident, and its expression is as follows:

[0045] in,

[0046] in, is the maximum frequency change rate allowed by the power grid, is the maximum frequency deviation safety threshold, is the quasi-steady-state deviation safety threshold. , , , All synchronous generators in the period The aggregate inertia time constant, aggregate equivalent damping coefficient, aggregate power droop coefficient and aggregate reheat coefficient of the synchronous generator set The inertia time constant , equivalent damping coefficient , power droop coefficient and reheat coefficient The relationship is as follows:

[0047] in, is the base value of the aggregation parameter, It is during the period The weight coefficient used in the aggregation.

[0048] As an example, the secondary frequency regulation safety constraint of the power grid after the accident may include the power shortage after the power grid accident. It needs to be compensated by synchronous generators, with the following constraints:

[0049] in, and Synchronous generator sets The power reserve and the upper limit of the power reserve.

[0050] In some optional implementations, the operation constraints may also include renewable energy site operation constraints and power grid operation constraints; wherein, the renewable energy site operation constraints include that the grid-connected power value of the renewable energy site is less than the power generation power value of the renewable energy site; the power grid operation constraints include the capacity constraints of the transmission lines and the balance constraints of the power grid. The randomness and uncertainty of renewable energy sites pose great challenges to the frequency security of the power grid. In the power grid, synchronous generators with frequency support capabilities are widely connected. Reasonable scheduling of synchronous generators in the power grid to actively participate in frequency support can significantly improve the frequency security of the power grid.

[0051] In this implementation, based on the time-sharing regulation, the set, quantity and index of renewable energy stations are recorded as , and . Time Renewable energy sites The following constraints need to be met:

[0052] in, It is a renewable energy site In the period The grid-connected power value, It is the time period Renewable energy sites Power generation value.

[0053] In addition, renewable energy site operating constraints can also be set according to the actual operating conditions of the renewable energy sites, such as output volatility, output limits, grid connection technical requirements, etc.

[0054] For the grid operation constraints, the set, number and index of transmission lines are respectively , and . Let the set, number and index of loads be , and . Then the time period Transmission lines The capacity constraints are as follows:

[0055] in, , and It is a synchronous generator , Renewable energy sites and load Relative transmission line The transfer factor is load In the period The power value, It is a transmission line Power transfer capacity, time period The power balance constraint of the power grid can be shown as follows:

[0056] In addition, grid operation constraints can also take into account factors such as grid upgrade and maintenance plans, power quality, grid interconnection and transmission.

[0057] In some optional implementations, the grid's dispatch has a multi-stage characteristic. The grid's day-ahead dispatch model is divided into multiple intraday time periods. The grid's cost includes the grid's cost for each intraday time period. The synchronous generator set's cost includes the synchronous generator set's cost for each intraday time period. The operating constraints also include affine mapping constraints on decision variables, and the decision variables include the active output of the synchronous generator set and the generated power of the renewable energy station.

[0058] As an example, consider the intraday period collection, quantity and index respectively. , and In order to ensure the causality of power system dispatching decisions, the active output of synchronous generator sets and the power generation capacity of renewable energy sites The following constraints need to be met:

[0059] in, and The variables are about The constant term coefficient and the linear term coefficient of ; and The variables are about The constant term coefficient and the linear term coefficient of .

[0060] This implementation takes into account the multi-stage characteristics of power grid dispatching and proposes a multi-stage dispatching method based on affine functions, which is more consistent with the actual physical system and provides a basis for achieving more accurate dispatching decisions.

[0061] The following is a description of the power grid day-ahead dispatching device considering frequency safety provided by the present invention. The power grid day-ahead dispatching device considering frequency safety described below and the power grid day-ahead dispatching method considering frequency safety described above can be referenced to each other.

[0062] Figure 2 A schematic diagram of the structure of a power grid day-ahead dispatching device considering frequency safety provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, it specifically includes: a first initialization module 201, which is configured to initialize a pre-built power grid day-ahead dispatch model, wherein the power grid day-ahead dispatch model is used to minimize the cost of the power grid, and the cost of the power grid includes the no-load operation cost of the synchronous generator set, the power generation cost of the synchronous generator set, and the frequency regulation incentive cost of the synchronous generator set. The frequency regulation incentive cost of the synchronous generator set is the product of the weight coefficient of the frequency regulation incentive cost and the frequency regulation incentive electricity price. The power grid dispatch day-ahead model is pre-set with operation constraints, and the operation constraints include the operation constraints of the synchronous generator set, the frequency safety constraints of the power grid frequency regulation after the accident, and the incentive electricity price constraints of the power grid; a second initialization module 201 is configured to initialize a pre-built power grid day-ahead dispatch model, wherein the power grid day-ahead dispatch model is used to minimize the cost of the power grid, and the cost of the power grid includes the no-load operation cost of the synchronous generator set, the power generation cost of the synchronous generator set, and the frequency regulation frequency safety constraints of the power grid after the accident, and the incentive electricity price constraints of the power grid; The initialization module 202 is configured to initialize a pre-built synchronous generator set power reserve model, which is used to minimize the cost of the synchronous generator set. The cost of the synchronous generator set is the cost of the synchronous generator set for frequency regulation capacity reserve minus the product of the power reserve of the synchronous generator set and the frequency regulation incentive electricity price; the establishment module 203 is configured to use the power grid day-ahead dispatch model as the objective function of the master side and the synchronous generator set power reserve model as the objective function of the slave side to establish a master-slave game model; the determination module 204 is configured to determine the frequency regulation incentive electricity price based on the established master-slave game model.

[0063] In some optional implementations, the determination module 204 is further configured to: obtain the optimal solution of the frequency modulation incentive electricity price through the power grid day-ahead dispatch model; determine the optimal solution of the power reserve of the synchronous generator set based on the optimal solution of the frequency modulation incentive electricity price and the power reserve model of the synchronous generator set; judge whether convergence is achieved based on the difference between the optimal solution of the power reserve and the weight coefficient of the frequency modulation incentive cost and a pre-set convergence threshold; if converged, end the iteration and output the optimal solution of the frequency modulation incentive electricity price; if not converged, set the weight coefficient of the frequency modulation incentive cost equal to the optimal solution of the power reserve, and continue to iterate to determine the frequency modulation incentive electricity price.

[0064] In some optional implementations, the frequency safety constraints of the power grid frequency regulation after the accident are set according to the decision power shortage. The frequency safety constraints of the power grid frequency regulation after the accident include the primary frequency safety constraints of the power grid frequency regulation after the accident and the secondary frequency safety constraints of the power grid frequency regulation after the accident.

[0065] In some optional implementations, the operating constraints also include renewable energy site operating constraints and power grid operating constraints; wherein, the renewable energy site operating constraints include that the grid-connected power value of the renewable energy site is less than the generated power value of the renewable energy site; the power grid operating constraints include capacity constraints of transmission lines and power grid power balance constraints.

[0066] In some optional implementations, the grid's dispatch has a multi-stage characteristic. The grid's day-ahead dispatch model is divided into multiple intraday time periods. The grid's cost includes the grid's cost for each intraday time period. The synchronous generator set's cost includes the synchronous generator set's cost for each intraday time period. The operating constraints also include affine mapping constraints on decision variables, and the decision variables include the active output of the synchronous generator set and the generated power of the renewable energy station.

[0067] The power grid day-ahead dispatching device considering frequency safety provided by the present invention encourages synchronous generator sets to actively participate in frequency regulation by establishing a pricing strategy based on master-slave game, thereby ensuring the frequency safety of the power grid.

[0068] Figure 3 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 3 As shown, the electronic device may include: a processor 310 , a communications interface 320 , a memory 330 and a communication bus 340 , wherein the processor 310 , the communications interface 320 , and the memory 330 communicate with each other via the communication bus 340 . The processor 310 can call the logic instructions in the memory 330 to execute the power grid day-ahead scheduling method considering frequency safety, the method comprising: initializing a pre-constructed power grid day-ahead scheduling model, wherein the power grid day-ahead scheduling model is used to minimize the cost of the power grid, the cost of the power grid includes the no-load operation cost of the synchronous generator set, the power generation cost of the synchronous generator set and the frequency regulation incentive cost of the synchronous generator set, the frequency regulation incentive cost of the synchronous generator set is the product of the weight coefficient of the frequency regulation incentive cost and the frequency regulation incentive electricity price, and operation constraints are pre-set for the power grid scheduling day-ahead model, the operation constraints include the operation constraints of the synchronous generator set, the frequency safety constraints of the power grid frequency regulation after the accident and the incentive electricity price constraints of the power grid; initializing a pre-constructed power reserve model of the synchronous generator set, the power reserve model of the synchronous generator set is used to minimize the cost of the synchronous generator set, the cost of the synchronous generator set is the cost of the frequency regulation capacity reserve of the synchronous generator set minus the product of the power reserve of the synchronous generator set and the frequency regulation incentive electricity price; taking the power grid day-ahead scheduling model as the objective function of the master side and the power reserve model of the synchronous generator set as the objective function of the slave side, and establishing a master-slave game model; determining the frequency regulation incentive electricity price based on the established master-slave game model.

[0069] In addition, the logic instructions in the above-mentioned memory 330 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0070] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the power grid day-ahead scheduling method considering frequency safety provided by the above methods, the method including: initializing a pre-constructed power grid day-ahead scheduling model, wherein the power grid day-ahead scheduling model is used to minimize the cost of the power grid, and the cost of the power grid includes the no-load operation cost of the synchronous generator set, the power generation cost of the synchronous generator set, and the frequency regulation incentive cost of the synchronous generator set, and the frequency regulation incentive cost of the synchronous generator set is the product of the weight coefficient of the frequency regulation incentive cost and the frequency regulation incentive electricity price. , operation constraints are pre-set for the day-ahead model of power grid dispatching, and the operation constraints include operation constraints of synchronous generator sets, safety constraints of power grid frequency regulation after accidents, and incentive electricity price constraints of the power grid; a pre-built power reserve model of synchronous generator sets is initialized, and the power reserve model of synchronous generator sets is used to minimize the cost of the synchronous generator sets, and the cost of the synchronous generator sets is the cost of frequency regulation capacity reserve of the synchronous generator sets minus the product of the power reserve of the synchronous generator sets and the frequency regulation incentive electricity price; the day-ahead dispatch model of the power grid is taken as the objective function of the master side, and the power reserve model of the synchronous generator sets is taken as the objective function of the slave side, and a master-slave game model is established; the frequency regulation incentive electricity price is determined based on the established master-slave game model.

[0071] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to execute the power grid day-ahead dispatching method considering frequency safety provided by the above-mentioned methods, the method comprising: initializing a pre-constructed power grid day-ahead dispatching model, wherein the power grid day-ahead dispatching model is used to minimize the cost of the power grid, the cost of the power grid includes the no-load operation cost of the synchronous generator set, the power generation cost of the synchronous generator set and the frequency regulation incentive cost of the synchronous generator set, the frequency regulation incentive cost of the synchronous generator set is the product of the weight coefficient of the frequency regulation incentive cost and the frequency regulation incentive electricity price, and the power grid dispatching model is pre-set for the day-ahead dispatching model. The operation constraints include the operation constraints of synchronous generator sets, the frequency safety constraints of power grid frequency regulation after accidents and the incentive electricity price constraints of the power grid; the pre-built power reserve model of synchronous generator sets is initialized, and the power reserve model of synchronous generator sets is used to minimize the cost of the synchronous generator sets, and the cost of the synchronous generator sets is the cost of the frequency regulation capacity reserve of the synchronous generator sets minus the product of the power reserve of the synchronous generator sets and the frequency regulation incentive electricity price; the power grid day-ahead dispatching model is used as the objective function of the master side, and the power reserve model of the synchronous generator sets is used as the objective function of the slave side, and a master-slave game model is established; the frequency regulation incentive electricity price is determined based on the established master-slave game model.

[0072] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0073] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for day-ahead dispatching of a power grid considering frequency security, characterized in that: include: Initialize a pre-built day-ahead dispatch model for a power grid, wherein the day-ahead dispatch model for a power grid is used to minimize the cost of the power grid, and the cost of the power grid includes the no-load operation cost of the synchronous generator set, the power generation cost of the synchronous generator set, and the frequency regulation incentive cost of the synchronous generator set, and the frequency regulation incentive cost of the synchronous generator set is the product of the weight coefficient of the frequency regulation incentive cost and the frequency regulation incentive electricity price, and operation constraints are pre-set for the day-ahead dispatch model for a power grid, and the operation constraints include the operation constraints of the synchronous generator set, the frequency safety constraints of the power grid frequency regulation after an accident, and the incentive electricity price constraints of the power grid; Initialize a pre-built synchronous generator set power reserve model, wherein the synchronous generator set power reserve model is used to minimize the cost of the synchronous generator set, wherein the cost of the synchronous generator set is the cost of the synchronous generator set performing frequency regulation capacity reserve minus the product of the power reserve amount of the synchronous generator set and the frequency regulation incentive electricity price; The power grid day-ahead dispatch model is used as the objective function of the master party, and the synchronous generator set power reserve model is used as the objective function of the slave party to establish a master-slave game model; The frequency regulation incentive electricity price is determined based on the established master-slave game model.

2. The method for day-ahead dispatching of a power grid considering frequency safety according to claim 1, characterized in that: The method of determining the frequency regulation incentive electricity price based on the established master-slave game model includes: Obtaining the optimal solution of the frequency regulation incentive electricity price through the power grid day-ahead dispatch model; Determine the optimal solution for the power reserve amount of the synchronous generator set according to the optimal solution for the frequency regulation incentive electricity price and the power reserve model of the synchronous generator set; Determining whether convergence occurs according to a difference between the optimal solution of the power reserve amount and the weight coefficient of the frequency modulation incentive cost and a preset convergence threshold; If convergence occurs, the iteration is terminated and the optimal solution of the frequency modulation incentive electricity price is output; If it does not converge, the weight coefficient of the frequency regulation incentive cost is set equal to the optimal solution of the power reserve, and the frequency regulation incentive electricity price is determined by continuing iteration.

3. The method for day-ahead dispatching of a power grid considering frequency safety according to claim 1, characterized in that: The post-accident power grid frequency regulation safety constraint is set according to the decision power shortage. The post-accident power grid frequency regulation safety constraint includes the post-accident power grid primary frequency regulation safety constraint and the post-accident power grid secondary frequency regulation safety constraint.

4. The method for day-ahead dispatching of a power grid considering frequency safety according to claim 1, characterized in that: The operating constraints also include renewable energy site operating constraints and power grid operating constraints; wherein, the renewable energy site operating constraints include that the grid-connected power value of the renewable energy site is less than the power generation power value of the renewable energy site; the power grid operating constraints include capacity constraints of transmission lines and power grid power balance constraints.

5. The method for day-ahead dispatching of a power grid considering frequency safety according to claim 4, characterized in that: The dispatch of the power grid has a multi-stage characteristic. The day-ahead dispatch model of the power grid is divided into multiple daily time periods. The cost of the power grid includes the cost of the power grid in each daily time period. The cost of the synchronous generator set includes the cost of the synchronous generator set in each daily time period. The operating constraints also include affine mapping constraints of decision variables, and the decision variables include the active output of the synchronous generator set and the generated power of the renewable energy station.

6. A day-ahead dispatching device for a power grid taking frequency safety into consideration, characterized in that: include: A first initialization module is configured to initialize a pre-built day-ahead dispatch model of a power grid, wherein the day-ahead dispatch model of the power grid is used to minimize the cost of the power grid, and the cost of the power grid includes the no-load operation cost of the synchronous generator set, the power generation cost of the synchronous generator set, and the frequency regulation incentive cost of the synchronous generator set, and the frequency regulation incentive cost of the synchronous generator set is the product of the weight coefficient of the frequency regulation incentive cost and the frequency regulation incentive electricity price, and operation constraints are pre-set for the day-ahead dispatch model of the power grid, and the operation constraints include the operation constraints of the synchronous generator set, the frequency safety constraints of the power grid frequency regulation after the accident, and the incentive electricity price constraints of the power grid; A second initialization module is configured to initialize a pre-built synchronous generator set power reserve model, wherein the synchronous generator set power reserve model is used to minimize the cost of the synchronous generator set, wherein the cost of the synchronous generator set is the cost of the synchronous generator set performing frequency regulation capacity reserve minus the product of the power reserve amount of the synchronous generator set and the frequency regulation incentive electricity price; An establishment module is configured to establish a master-slave game model by taking the power grid day-ahead dispatch model as the objective function of the master and the synchronous generator set power reserve model as the objective function of the slave; The determination module is configured to determine the frequency regulation incentive electricity price based on the established master-slave game model.

7. The day-ahead dispatching device for a power grid considering frequency safety according to claim 6, characterized in that: The determining module is further configured to: Obtaining the optimal solution of the frequency regulation incentive electricity price through the power grid day-ahead dispatch model; Determine the optimal solution for the power reserve amount of the synchronous generator set according to the optimal solution for the frequency regulation incentive electricity price and the power reserve model of the synchronous generator set; Determining whether convergence occurs according to a difference between the optimal solution of the power reserve amount and the weight coefficient of the frequency modulation incentive cost and a preset convergence threshold; If convergence occurs, the iteration is terminated and the optimal solution of the frequency modulation incentive electricity price is output; If it does not converge, the weight coefficient of the frequency regulation incentive cost is set equal to the optimal solution of the power reserve, and the frequency regulation incentive electricity price is determined by continuing iteration.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the day-ahead dispatching method for a power grid taking frequency security into consideration as described in any one of claims 1 to 5 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for day-ahead dispatching of a power grid taking into account frequency security as described in any one of claims 1 to 5 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for day-ahead dispatching of a power grid taking into account frequency security as described in any one of claims 1 to 5 is implemented.

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