Power market clearing method and related device considering cross-sectional congestion elastic relaxation

Abstract

The application belongs to the technical field of electric power automation, and discloses a power market clearing method considering cross-section blocking elastic relaxation and a related device; the method comprises the following steps: receiving a power market clearing request, requesting to perform power market clearing; calling a constraint condition to solve a pre-established power market optimization model considering temporary relaxation of key cross-section limits, and obtaining a power market clearing result; and outputting the power market clearing result; wherein the model takes minimum unit purchase cost as an objective function; the constraint conditions comprise: system power balance constraint, unit operation constraint and key cross-section limit relaxation time limit constraint. The application takes into account the characteristics of the cross-section that can withstand short-time overrun, constructs the key cross-section limit relaxation time limit constraint, can fully utilize the power grid power transmission capacity, thereby improving the rationality of the market optimization clearing scheme, effectively dealing with the network blocking situation under the extreme scenario, and improving the power grid safety margin and reducing the power grid safety risk.

Description

Technical Field

[0001] This invention belongs to the field of power automation technology, and specifically relates to a power market clearing method and related apparatus that considers cross-sectional blockage elastic relaxation. Background Technology

[0002] The cross-section is composed of multiple power grid branches. By controlling the power flow of the cross-section, the transmission capacity of the power grid in a certain direction can be limited, thus better ensuring the safe operation of the power grid.

[0003] A transmission section refers to a set of transmission lines connecting two regional power grids, which collectively undertake the task of power transmission between regions. Transmission section exceeding limits refers to the transmission power of a transmission section in a power system exceeding its prescribed limit. Currently, the power grid operation mode determined by market transactions is prone to transmission section exceeding limits, leading to a decrease in grid safety margin. Considering section limit constraints can avoid grid operation risks and is an important means to ensure that market clearing results meet the requirements for safe grid operation. However, current section limits are often designed as fixed limits, and some studies improve convergence by simply relaxing network constraints. Designing section limits as fixed limits can easily lead to network constraints not being met, resulting in non-convergence. Simply improving convergence through network constraint relaxation may lead to prolonged section exceeding limits, posing a risk to grid safety. Summary of the Invention

[0004] The purpose of this invention is to provide a power market clearing method and related apparatus that takes into account the elastic relaxation of cross-sectional blockage, so as to reduce power grid security risks.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a power market clearing method considering cross-sectional blockage elastic relaxation, comprising:

[0007] Receive requests for electricity market clearing and request that electricity market clearing be carried out;

[0008] The pre-established power market optimization model, which considers temporary relaxation of the quota at key sections, is used to solve the constraints to obtain the power market clearing results.

[0009] Output the results of the electricity market clearing;

[0010] The objective function of the pre-established electricity market optimization model that considers temporary relaxation of key section limits is:

[0011]

[0012] in, T Indicates the total number of time periods. IThis represents the total number of generating units. For the unit i At any moment t of efforts, For the unit i At any moment t The cost of purchasing electricity;

[0013] The constraints of the pre-established power market optimization model that considers temporary relaxation of the critical section quota include: system power balance constraints, unit operation constraints, and time limit constraints for the relaxation of the critical section quota.

[0014] A further improvement of the present invention is that the system power balance constraint includes:

[0015]

[0016] In the formula: For a moment t The system load.

[0017] A further improvement of the present invention is that the unit operating constraints include:

[0018]

[0019]

[0020]

[0021] In the formula: , The units The upper and lower limits of output; , The units The upper and lower limits of climbing ability; For the unit i At any moment t+1 of effort.

[0022] A further improvement of this invention is that the key section limit relaxation time constraint includes:

[0023]

[0024]

[0025]

[0026]

[0027]

[0028] In the formula, For at any time t unit i cross section z Sensitivity, For at any time t The sum of the product of the sensitivities of all loads to section z; , These are the upper and lower limits of the transmission power at section z, respectively; m The relaxation coefficient for the critical section limit; It is a constant; , These are integer variables used to determine whether the line power flow exceeds the lower and upper limits of the transmission capacity, respectively. t i Let z be the longest relaxation interval for the critical section z. t a The maximum allowable relaxation time for the critical section z.

[0029] A further improvement of the present invention is that the key cross-section is obtained through the following steps:

[0030] A power market optimization model with relaxed power flow is constructed; the objective function expression of the power market optimization model with relaxed power flow is:

[0031]

[0032] In the formula: , Cross-sections z The penalty cost of exceeding the upper and lower limits, , Cross-sections z At any moment t The higher the upper limit and the lower the lower limit, the more limited the quantity;

[0033] The constraints of the power market optimization model with relaxed power flow include: system power balance constraints, unit operation constraints, and cross-sectional power flow relaxation constraints.

[0034] The cross-sectional power flow relaxation constraint specifically includes:

[0035]

[0036]

[0037] In the formula: For at any time t unit i cross section z Sensitivity, For at any time t The sum of the product of the sensitivities of all loads to section z; , These are the upper and lower limits of the transmission power at section z, respectively;

[0038] The power market optimization model with relaxed power flow is solved to obtain the cross-sectional power flow results; based on the cross-sectional power flow results, key cross sections are identified to obtain the set of key cross sections.

[0039] A further improvement of this invention is that the step of identifying key sections based on cross-sectional power flow results and obtaining a set of key sections specifically includes:

[0040] Determine whether each section in the sectional power flow results meets the following conditions:

[0041]

[0042] or

[0043]

[0044] The cross sections that meet the above conditions are designated as key cross sections and added to the key cross section set.

[0045] In the formula: The critical section overload threshold; For at any time t unit i cross section Sensitivity; , Cross-sections The upper and lower limits of transmission power.

[0046] A further improvement of the present invention is that it further includes the following steps:

[0047] Control each generating unit in the electricity market to operate in accordance with the electricity market clearing results.

[0048] Secondly, the present invention provides a power market clearing device that considers cross-sectional blockage elastic relaxation, comprising:

[0049] The receiving module is used to receive electricity market clearing requests and request electricity market clearing.

[0050] Call the solver module to solve the pre-established power market optimization model that considers temporary relaxation of the quota at key sections, and obtain the power market clearing results.

[0051] The output module is used to output the electricity market clearing results;

[0052] The objective function of the pre-established electricity market optimization model that considers temporary relaxation of key section limits is:

[0053]

[0054] in, T Indicates the total number of time periods. I This represents the total number of generating units. For the unit i At any moment t of efforts, For the unit i At any moment t The cost of purchasing electricity;

[0055] The constraints of the pre-established power market optimization model that considers temporary relaxation of the critical section quota include: system power balance constraints, unit operation constraints, and time limit constraints for the relaxation of the critical section quota.

[0056] A further improvement of the present invention is that the system power balance constraint includes:

[0057]

[0058] In the formula: For a moment t The system load.

[0059] A further improvement of the present invention is that the unit operating constraints include:

[0060]

[0061]

[0062]

[0063] In the formula: , The units The upper and lower limits of output; , The units The upper and lower limits of climbing ability; For the unit i At any moment t+1 of effort.

[0064] A further improvement of this invention is that the key section limit relaxation time constraint includes:

[0065]

[0066]

[0067]

[0068]

[0069]

[0070] In the formula, For at any time t unit i cross section z Sensitivity, For at any time t The sum of the product of the sensitivities of all loads to section z; , These are the upper and lower limits of the transmission power at section z, respectively; m The relaxation coefficient for the critical section limit; It is a constant; , These are integer variables used to determine whether the line power flow exceeds the lower and upper limits of the transmission capacity, respectively. t i Let z be the longest relaxation interval for the critical section z. t a The maximum allowable relaxation time for the critical section z.

[0071] A further improvement of the present invention is that the key cross-section is obtained through the following steps:

[0072] A power market optimization model with relaxed power flow is constructed; the objective function expression of the power market optimization model with relaxed power flow is:

[0073]

[0074] In the formula: , Cross-sections z The penalty cost of exceeding the upper and lower limits, , Cross-sections z At any moment t The higher the upper limit and the lower the lower limit, the more limited the quantity;

[0075] The constraints of the power market optimization model with relaxed power flow include: system power balance constraints, unit operation constraints, and cross-sectional power flow relaxation constraints.

[0076] The cross-sectional power flow relaxation constraint specifically includes:

[0077]

[0078]

[0079] In the formula: For at any time t unit i cross section z Sensitivity, For at any time t The sum of the product of the sensitivities of all loads to section z; , These are the upper and lower limits of the transmission power at section z, respectively;

[0080] The power market optimization model with relaxed power flow is solved to obtain the cross-sectional power flow results; based on the cross-sectional power flow results, key cross sections are identified to obtain the set of key cross sections.

[0081] A further improvement of this invention is that the step of identifying key sections based on cross-sectional power flow results and obtaining a set of key sections specifically includes:

[0082] Determine whether each section in the sectional power flow results meets the following conditions:

[0083]

[0084] or

[0085]

[0086] The cross sections that meet the above conditions are designated as key cross sections and added to the key cross section set.

[0087] In the formula: The critical section overload threshold; For at any time t unit i cross section Sensitivity; , Cross-sections The upper and lower limits of transmission power.

[0088] A further improvement of the present invention is that it also includes: a control module;

[0089] The control module is used to control each generating unit in the electricity market to operate in accordance with the electricity market clearing results.

[0090] Thirdly, the present invention provides an electronic device including a processor and a memory, the processor being configured to execute a computer program stored in the memory to implement the aforementioned electricity market clearing method considering cross-sectional blockage elastic relaxation.

[0091] Fourthly, the present invention provides a computer-readable storage medium storing at least one instruction that, when executed by a processor, implements the power market clearing method considering cross-sectional blockage elastic relaxation.

[0092] Compared with the prior art, the present invention has the following beneficial effects:

[0093] This invention provides a power market clearing method considering the elastic relaxation of key section blockages, comprising: receiving a power market clearing request and requesting power market clearing; invoking constraints to solve a pre-established power market optimization model considering temporary relaxation of key section limits, obtaining the power market clearing result; and outputting the power market clearing result; wherein, the objective function of the pre-established power market optimization model considering temporary relaxation of key section limits is: ;in, T Indicates the total number of time periods. I This represents the total number of generating units. For the unit i At any moment t of efforts, For the unit i At any moment t The electricity purchase cost; the constraints of the pre-established electricity market optimization model considering temporary relaxation of key section limits include: system power balance constraints, unit operation constraints, and key section limit relaxation time constraints. This invention provides an electricity market clearing method considering elastic relaxation of section congestion. Taking into account the characteristic that sections can withstand short-term limit exceedances, a key section limit relaxation time constraint is constructed. This fully utilizes the power transmission capacity of the power grid, thereby improving the rationality of the market optimization clearing scheme, effectively coping with network congestion in extreme scenarios, while simultaneously increasing the power grid safety margin and reducing power grid safety risks.

[0094] Furthermore, cross-sectional quota relaxation modeling requires the introduction of a large number of integer variables, significantly increasing the solution burden of the electricity market optimization and clearing model. This invention proposes a method for constructing a key cross-section set, which can significantly and accurately reduce the scale of integer variables in the model, and significantly improve the model solution efficiency while maintaining high computational accuracy. Attached Figure Description

[0095] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0096] Figure 1 A flowchart illustrating a power market clearing method considering cross-sectional blockage elastic relaxation, provided for an embodiment of the present invention;

[0097] Figure 2 A flowchart illustrating a power market clearing method considering cross-sectional blockage elastic relaxation, provided for another embodiment of the present invention;

[0098] Figure 3 A flowchart illustrating a power market clearing method considering cross-sectional blockage elastic relaxation, provided for another specific embodiment of the present invention;

[0099] Figure 4 A schematic diagram of a power market clearing device considering cross-sectional blockage elastic relaxation is provided for an embodiment of the present invention;

[0100] Figure 5 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0101] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0102] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0103] Please see Figure 1 As shown, this embodiment of the invention provides a power market clearing method considering cross-sectional blockage elastic relaxation, comprising the following steps:

[0104] Step S1: Construct a power market optimization model with relaxed power flow and obtain a set of key sections.

[0105] The power market optimization model with relaxed power flow ensures that the power market will not fail to converge due to the inability to eliminate power flow exceeding the limit at the cross-section. The objective function includes the unit's electricity purchase cost and the penalty function for relaxing the power flow exceeding the limit at the cross-section, ensuring the convergence of the model. The specific expression of the objective function is as follows:

[0106] (1)

[0107] In the formula: T Indicates the total number of time periods. I This represents the total number of generating units. For the unit i At any moment t of efforts, For the unit i At any moment t The cost of electricity purchase is a piecewise linear function. , Cross-sections z The penalty cost of exceeding the upper and lower limits, , Cross-sections z At any moment t The higher the upper limit and the lower the lower limit, the more limited the quantity.

[0108] Constraints of the power market optimization model with relaxed power flow:

[0109] 1) System power balance constraints:

[0110] (2)

[0111] In the formula: For a moment t The system load.

[0112] 2) Unit operating constraints:

[0113] (3)

[0114] (4)

[0115] (5)

[0116] In the formula: , The units The upper and lower limits of output. , The units The upper and lower limits of climbing ability; For the unit i At any moment t+1 of effort.

[0117] 3) Cross-sectional tidal current relaxation constraint:

[0118] (6)

[0119] (7)

[0120] In the formula: For at any time t unit i cross section z Sensitivity, For at any time t The sum of the product of the sensitivities of all loads to section z; , These represent the upper and lower limits of the transmission power at section z, respectively.

[0121] The power market optimization model with relaxed power flow is a mixed integer programming problem that can be solved using optimization software such as CPLEX to obtain cross-sectional power flow results.

[0122] Forming a set of key cross sections Z α , Z α cross section zα The following conditions must be met:

[0123] (8)

[0124] or

[0125] (9)

[0126] In the formula: The critical section overload threshold can be set to 0.8; For at any time t unit i cross section Sensitivity, For at any time t All loads on the cross section The product of sensitivity; , Cross-sections The upper and lower limits of transmission power.

[0127] Step S2: Construct the critical section limit relaxation time constraint:

[0128] (10)

[0129] (11)

[0130] (12)

[0131] (13)

[0132] In the formula, For a very large constant, such as 10000 or 1000000; , These are integer variables used to determine whether the line power flow exceeds the lower and upper limits of the transmission capacity, respectively. For example, if the line power flow exceeds the transmission capacity limit, then It will be limited to 0, otherwise, It will be limited to 1; For example, if the line power flow exceeds the transmission capacity limit, then It will be limited to 0, otherwise, It will be limited to 1.

[0133] Therefore, it can be based on and The value of determines whether the line has undergone short-term capacity expansion (a value of 0 indicates short-term capacity expansion). Furthermore, considering that transmission lines can only undergo short-term capacity expansion and that there should be a certain cooling interval after the expansion, a constraint on the relaxation time of the critical section limit is finally established.

[0134] (14)

[0135] In the formula, m The relaxation coefficient for the critical section limit; t i Let z be the longest relaxation interval for the critical section z. t a The maximum allowable relaxation time for the critical section z.

[0136] Step S3: Construct an electricity market optimization model that considers temporary relaxation of quotas at key sections, and solve for the clearing scheme.

[0137] The objective function of the electricity market optimization model considering temporary relaxation of critical section limits is as follows:

[0138] Unlike formula (1), only the unit's electricity purchase cost is considered, as follows:

[0139] (15)

[0140] Constraints of the electricity market optimization model considering temporary relaxation of critical section limits:

[0141] Considering constraints (2)-(5) and (10)-(14), for those not in the critical section set Z α cross section z β Relaxation cannot be performed, as follows:

[0142] (16)

[0143] (17)

[0144] The above model is a mixed integer programming problem, which can be solved using optimization software such as CPLEX to obtain the optimized output results for each unit.

[0145] Please see Figure 2 As shown, this embodiment of the invention provides a power market clearing method considering cross-sectional blockage elastic relaxation, including:

[0146] S100: Receive electricity market clearing request and request electricity market clearing;

[0147] S200: Call the constraints to solve the pre-established power market optimization model that considers temporary relaxation of the quota at key sections, and obtain the power market clearing results.

[0148] S300, outputting the results of the electricity market clearing;

[0149] The objective function of the pre-established electricity market optimization model that considers temporary relaxation of key section limits is:

[0150]

[0151] in, T Indicates the total number of time periods. I This represents the total number of generating units. For the unit i At any moment t of efforts, For the unit i At any moment t The cost of purchasing electricity;

[0152] The constraints of the pre-established power market optimization model that considers temporary relaxation of the critical section quota include: system power balance constraints, unit operation constraints, and time limit constraints for the relaxation of the critical section quota.

[0153] In one specific embodiment, the system power balance constraint includes:

[0154]

[0155] In the formula: For a moment t The system load.

[0156] In one specific implementation, the unit operating constraints include:

[0157]

[0158]

[0159]

[0160] In the formula: , The units The upper and lower limits of output; , The units The upper and lower limits of climbing ability; For the unit i At any moment t+1 of effort.

[0161] In one specific implementation, the critical section limit relaxation time constraint includes:

[0162]

[0163]

[0164]

[0165]

[0166]

[0167] In the formula, For at any time t unit i cross section z Sensitivity, For at any time t The sum of the product of the sensitivities of all loads to section z; , These are the upper and lower limits of the transmission power at section z, respectively; m The relaxation coefficient for the critical section limit; It is a constant; , These are integer variables used to determine whether the line power flow exceeds the lower and upper limits of the transmission capacity, respectively. t i Let z be the longest relaxation interval for the critical section z. t a The maximum allowable relaxation time for the critical section z.

[0168] In one specific embodiment, the key section is obtained through the following steps:

[0169] A power market optimization model with relaxed power flow is constructed; the objective function expression of the power market optimization model with relaxed power flow is:

[0170]

[0171] In the formula: , Cross-sections z The penalty cost of exceeding the upper and lower limits, , Cross-sections z At any moment t The higher the upper limit and the lower the lower limit, the more limited the quantity;

[0172] The constraints of the power market optimization model with relaxed power flow include: system power balance constraints, unit operation constraints, and cross-sectional power flow relaxation constraints.

[0173] The cross-sectional power flow relaxation constraint specifically includes:

[0174]

[0175]

[0176] In the formula: For at any time t unit i cross section z Sensitivity, For at any time t The sum of the product of the sensitivities of all loads to section z; , These are the upper and lower limits of the transmission power at section z, respectively;

[0177] The power market optimization model with relaxed power flow is solved to obtain the cross-sectional power flow results; based on the cross-sectional power flow results, key cross sections are identified to obtain the set of key cross sections.

[0178] In one specific embodiment, the step of identifying key sections based on cross-sectional power flow results and obtaining a set of key sections specifically includes:

[0179] Determine whether each section in the sectional power flow results meets the following conditions:

[0180]

[0181] or

[0182]

[0183] The cross sections that meet the above conditions are designated as key cross sections and added to the key cross section set.

[0184] In the formula: The critical section overload threshold; For at any time t unit i cross section Sensitivity; , Cross-sections The upper and lower limits of transmission power.

[0185] Please see Figure 3 As shown, in one specific embodiment, the following steps are also included:

[0186] S4. Control each generating unit in the electricity market to operate according to the electricity market clearing results.

[0187] Please see Figure 4As shown, an embodiment of the present invention provides a power market clearing device that considers cross-sectional blockage elastic relaxation, comprising:

[0188] The receiving module is used to receive electricity market clearing requests and request electricity market clearing.

[0189] Call the solver module to solve the pre-established power market optimization model that considers temporary relaxation of the quota at key sections, and obtain the power market clearing results.

[0190] The output module is used to output the electricity market clearing results;

[0191] The objective function of the pre-established electricity market optimization model that considers temporary relaxation of key section limits is:

[0192]

[0193] in, T Indicates the total number of time periods. I This represents the total number of generating units. For the unit i At any moment t of efforts, For the unit i At any moment t The cost of purchasing electricity;

[0194] The constraints of the pre-established power market optimization model that considers temporary relaxation of the critical section quota include: system power balance constraints, unit operation constraints, and time limit constraints for the relaxation of the critical section quota.

[0195] Please see Figure 5 As shown, an embodiment of the present invention provides an electronic device 100 for implementing a power market clearing method that takes into account cross-sectional blockage elastic relaxation; the electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.

[0196] The memory 101 can be used to store the computer program 103. The processor 102 implements the steps of the electricity market clearing method considering cross-sectional blockage elastic relaxation described in the embodiment by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device 100 (such as audio data), etc. In addition, the memory 101 may include non-volatile memory, such as hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0197] The at least one processor 102 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 may be a microprocessor or any conventional processor. The processor 102 is the control center of the electronic device 100, connecting various parts of the electronic device 100 via various interfaces and lines.

[0198] The memory 101 in the electronic device 100 stores multiple instructions to implement a power market clearing method that takes into account cross-sectional blockage elastic relaxation, and the processor 102 can execute the multiple instructions to implement:

[0199] Receive requests for electricity market clearing and request that electricity market clearing be carried out;

[0200] The pre-established power market optimization model, which considers temporary relaxation of the quota at key sections, is used to solve the constraints to obtain the power market clearing results.

[0201] Output the results of the electricity market clearing;

[0202] The objective function of the pre-established electricity market optimization model that considers temporary relaxation of key section limits is:

[0203]

[0204] in, T Indicates the total number of time periods. I This represents the total number of generating units. For the unit i At any moment t of efforts, For the unit i At any moment t The cost of purchasing electricity;

[0205] The constraints of the pre-established power market optimization model that considers temporary relaxation of the critical section quota include: system power balance constraints, unit operation constraints, and time limit constraints for the relaxation of the critical section quota.

[0206] If the modules / units integrated in the electronic device 100 are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, and a read-only memory (ROM).

[0207] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can 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, etc.) containing computer-usable program code.

[0208] This 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 block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can 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, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0209] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0210] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0211] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A power market clearing method considering cross-sectional blockage elastic relaxation, characterized in that, include: Receive requests for electricity market clearing and request that electricity market clearing be carried out; The pre-established power market optimization model, which considers temporary relaxation of the quota at key sections, is used to solve the constraints to obtain the power market clearing results. Output the results of the electricity market clearing; The objective function of the pre-established electricity market optimization model that considers temporary relaxation of key section limits is: in, T Indicates the total number of time periods. I This represents the total number of generating units. For the unit i At any moment t of efforts, For the unit i At any moment t The cost of purchasing electricity; The constraints of the pre-established power market optimization model that considers temporary relaxation of the key section quota include: system power balance constraints, unit operation constraints, and key section quota relaxation time constraints. The key section limit relaxation time constraint includes: In the formula, For at any time t unit i cross section z Sensitivity, For at any time t The sum of the product of the sensitivities of all loads to section z; , These are the upper and lower limits of the transmission power at section z, respectively; m The relaxation coefficient for the critical section limit; It is a constant; , These are integer variables used to determine whether the line power flow exceeds the lower and upper limits of the transmission capacity, respectively. t i The longest relaxation interval for the critical section z is given by the limit. t a The maximum allowable relaxation time for the critical section z; The key cross-section is obtained through the following steps: A power market optimization model with relaxed power flow is constructed; the objective function expression of the power market optimization model with relaxed power flow is: In the formula: , Cross-sections z The penalty cost of exceeding the upper and lower limits, , Cross-sections z At any moment t The higher the upper limit and the lower the lower limit, the more limited the quantity; The constraints of the power market optimization model with relaxed power flow include: system power balance constraints, unit operation constraints, and cross-sectional power flow relaxation constraints. The cross-sectional power flow relaxation constraint specifically includes: In the formula: For at any time t unit i cross section z Sensitivity, For at any time t The sum of the product of the sensitivities of all loads to section z; , These are the upper and lower limits of the transmission power at section z, respectively; The power market optimization model with relaxed power flow is solved to obtain the cross-sectional power flow results; based on the cross-sectional power flow results, key cross sections are identified to obtain the set of key cross sections.

2. The electricity market clearing method considering cross-sectional blockage elastic relaxation according to claim 1, characterized in that, The system power balance constraints include: In the formula: For a moment t The system load.

3. The electricity market clearing method considering cross-sectional blockage elastic relaxation according to claim 1, characterized in that, The unit operating constraints include: In the formula: , The units The upper and lower limits of output; , The units The upper and lower limits of climbing ability; For the unit i At any moment t+1 of effort.

4. The electricity market clearing method considering cross-sectional blockage elastic relaxation according to claim 1, characterized in that, The step of identifying key sections based on cross-sectional power flow results and obtaining a set of key sections specifically includes: Determine whether each section in the sectional power flow results meets the following conditions: or The cross sections that meet the above conditions are designated as key cross sections and added to the key cross section set. In the formula: The critical section overload threshold; For at any time t unit i cross section Sensitivity; , Cross-sections The upper and lower limits of transmission power.

5. The electricity market clearing method considering cross-sectional blockage elastic relaxation according to claim 1, characterized in that, It also includes the following steps: Control each generating unit in the electricity market to operate in accordance with the electricity market clearing results.

6. A power market clearing device considering cross-sectional blocking elastic relaxation, characterized in that, include: The receiving module is used to receive electricity market clearing requests and request electricity market clearing. Call the solver module to solve the pre-established power market optimization model that considers temporary relaxation of the quota at key sections, and obtain the power market clearing results. The output module is used to output the electricity market clearing results; The objective function of the pre-established electricity market optimization model that considers temporary relaxation of key section limits is: in, T Indicates the total number of time periods. I This represents the total number of generating units. For the unit i At any moment t of efforts, For the unit i At any moment t The cost of purchasing electricity; The constraints of the pre-established power market optimization model that considers temporary relaxation of the key section quota include: system power balance constraints, unit operation constraints, and key section quota relaxation time constraints. The key section limit relaxation time constraint includes: In the formula, For at any time t unit i cross section z Sensitivity, For at any time t The sum of the product of the sensitivities of all loads to section z; , These are the upper and lower limits of the transmission power at section z, respectively; m The relaxation coefficient for the critical section limit; It is a constant; , These are integer variables used to determine whether the line power flow exceeds the lower and upper limits of the transmission capacity, respectively. t i The longest relaxation interval for the critical section z is given by the limit. t a The maximum allowable relaxation time for the critical section z; The key cross-section is obtained through the following steps: A power market optimization model with relaxed power flow is constructed; the objective function expression of the power market optimization model with relaxed power flow is: In the formula: , Cross-sections z The penalty cost of exceeding the upper and lower limits, , Cross-sections z At any moment t The higher the upper limit and the lower the lower limit, the more limited the quantity; The constraints of the power market optimization model with relaxed power flow include: system power balance constraints, unit operation constraints, and cross-sectional power flow relaxation constraints. The cross-sectional power flow relaxation constraint specifically includes: In the formula: For at any time t unit i cross section z Sensitivity, For at any time t The sum of the product of the sensitivities of all loads to section z; , These are the upper and lower limits of the transmission power at section z, respectively; The power market optimization model with relaxed power flow is solved to obtain the cross-sectional power flow results; based on the cross-sectional power flow results, key cross sections are identified to obtain the set of key cross sections.

7. The electricity market clearing device considering cross-sectional blockage elastic relaxation according to claim 6, characterized in that, The system power balance constraints include: In the formula: For a moment t The system load.

8. The electricity market clearing device considering cross-sectional blockage elastic relaxation according to claim 6, characterized in that, The unit operating constraints include: In the formula: , The units The upper and lower limits of output; , The units The upper and lower limits of climbing ability; For the unit i At any moment t+1 of effort.

9. The electricity market clearing device considering cross-sectional blockage elastic relaxation according to claim 6, characterized in that, The step of identifying key sections based on cross-sectional power flow results and obtaining a set of key sections specifically includes: Determine whether each section in the sectional power flow results meets the following conditions: or The cross sections that meet the above conditions are designated as key cross sections and added to the key cross section set. In the formula: The critical section overload threshold; For at any time t unit i cross section Sensitivity; , Cross-sections The upper and lower limits of transmission power.

10. The electricity market clearing device considering cross-sectional blockage elastic relaxation according to claim 6, characterized in that, Also includes: Control module; The control module is used to control each generating unit in the electricity market to operate in accordance with the electricity market clearing results.

11. An electronic device, characterized in that, It includes a processor and a memory, the processor being used to execute a computer program stored in the memory to implement the electricity market clearing method considering cross-sectional blockage elastic relaxation as described in any one of claims 1 to 5.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one instruction that, when executed by a processor, implements the electricity market clearing method considering cross-sectional blockage elastic relaxation as described in any one of claims 1 to 5.

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