Power grid active regulation method, device, equipment, medium and product

Abstract

This invention provides a method, apparatus, equipment, medium, and product for active power grid regulation. The method includes identifying transmission sections to be regulated that are predicted to experience power exceedance; determining the current static stability reserve coefficient based on the current operating state of the transmission section to be regulated; calculating the stability coefficient sensitivity of the transmission section to be regulated when the current static stability reserve coefficient does not meet the safety margin condition; determining the corrected power upper limit of the transmission section to be regulated based on the sensitivity of the static stability reserve coefficient of the transmission section to the transmission power; and regulating the power grid under constraints including the corrected power upper limit, with the goal of minimizing the power grid regulation cost.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a power grid active regulation method, device, equipment, medium and product. Background Art

[0002] In the context of the accelerated construction of a new power system, a large number of volatile power sources such as high-proportion distributed photovoltaics and wind power are connected to the power grid on a large scale, which changes the operating characteristics of the power system, intensifies the power fluctuations of the transmission section, and significantly increases the risk of over-limit. At the same time, the multi-source interaction of "source-grid-load-storage" is becoming increasingly frequent, and the system operating conditions are becoming more complex. The traditional regulation mode based on static security checking and fixed power limits faces severe challenges. At present, for the problem of power grid power over-limit, it mainly relies on dispatchers to perform post-correction control based on experience, or adopt conservative transmission limits in the day-ahead plan to reserve a safety margin. The former often results in high control costs and even chain risks due to the lag in response; the latter limits the line transmission capacity due to excessive conservatism, reducing the economic efficiency of the power grid operation and the new energy consumption space.

[0003] However, when generating specific control instructions, the existing power grid power over-limit active regulation methods often have difficulty in taking into account both operation safety and economic costs. At present, in order to reserve sufficient safety margins, the dispatching system generally adopts fixed and conservative transmission power limits in the day-ahead plan or online regulation. This constraint on the power upper limit is too rigid and fails to systematically incorporate the static stability reserve situation of the power grid into the online optimization framework for linkage analysis. This results in that during the active regulation process, the system only passively searches for a dispatching plan within a fixed power boundary, ignoring the transmission potential that may still exist in the current actual operating conditions of the power grid; once it is predicted that an over-limit will occur, the system often can only take overly conservative preventive control actions (such as a large reduction in new energy output or load shedding), which not only limits the actual transmission capacity of the line and the new energy consumption space, but also leads to a significant increase in the overall regulation cost, making it difficult to ensure the economy of active regulation. Summary of the Invention

[0004] The present invention provides a power grid active regulation method, device, equipment, medium and product, which is used to solve the technical problem in the prior art that the system can only passively search for a dispatching plan within a fixed power boundary, resulting in a relatively high overall regulation cost.

[0005] This invention provides a method for active power grid regulation, comprising: identifying transmission sections to be regulated that are predicted to experience power exceedance; determining a current static stability reserve coefficient based on the current operating state of the transmission section to be regulated; calculating the stability coefficient sensitivity of the transmission section to be regulated when the current static stability reserve coefficient does not meet the safety margin condition; determining a corrected power upper limit for the transmission section to be regulated based on the sensitivity of the static stability reserve coefficient of the transmission section to the transmission power; and regulating the power grid under constraints including the corrected power upper limit, with the goal of minimizing power grid regulation cost.

[0006] According to the active power grid control method provided by the present invention, the current operating state includes the current power limit and the current transmission power of the transmission section to be controlled at the current operating time.

[0007] According to the active power grid control method provided by the present invention, the step of controlling the power grid with the objective function of minimizing the power grid control cost, under the constraint condition including the modified power upper limit, includes: constructing a safe power range based on a preset lower limit value and upper limit value of the static stability reserve coefficient, and the current transmission power of the transmission section to be controlled; optimizing the modified power upper limit within the safe power range to determine the optimal power upper limit that minimizes the power grid control cost; updating the optimal power upper limit to the constraint condition for economic dispatch solution, and generating a control command for controlling the power grid.

[0008] According to the active power grid control method provided by the present invention, determining the upper limit of the corrected power of the transmission section to be controlled based on the sensitivity of the static stability reserve coefficient of the transmission section to be controlled to the transmission power includes: determining the historical transmission power and the historical static stability reserve coefficient at historical operating times; determining the sensitivity based on the current transmission power, the current static stability reserve coefficient, the historical transmission power, and the historical static stability reserve coefficient; and determining the upper limit of the corrected power according to the current transmission power, the current static stability reserve coefficient, a preset lower limit of the static stability reserve coefficient, and the sensitivity.

[0009] The active power grid control method provided by the present invention further includes: when the current static stability reserve coefficient meets the safety margin condition, determining the current power upper limit of the transmission section to be controlled as the corrected power upper limit.

[0010] According to the active power grid control method provided by the present invention, the constraints also include generation-load balance constraints, upper and lower limits of unit output constraints, and unit ramping constraints.

[0011] The present invention also provides an active power grid control device, comprising: an identification module for identifying transmission sections to be controlled that are predicted to experience power exceedance; a reserve coefficient determination module for determining a current static stability reserve coefficient based on the current operating state of the transmission section to be controlled; a sensitivity determination module for calculating the stability coefficient sensitivity of the transmission section to be controlled when the current static stability reserve coefficient does not meet the safety margin condition; a power upper limit correction module for determining a corrected power upper limit for the transmission section to be controlled based on the sensitivity of the static stability reserve coefficient of the transmission section to the transmission power; and a control module for controlling the power grid under constraints including the corrected power upper limit, with the goal of minimizing the power grid control cost.

[0012] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the active power grid control method as described above.

[0013] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the active power grid control method as described above.

[0014] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the active power grid control method as described above.

[0015] The present invention provides a method, apparatus, equipment, medium, and product for active power grid regulation. First, it identifies and predicts transmission sections that will exceed power limits, and assesses the current static stability reserve coefficient based on their current operating state to perceive the grid's safety margin in real time. Further, when the safety margin does not meet preset conditions, it calculates the sensitivity of the static stability reserve coefficient to transmission power and determines a corrected power upper limit for the transmission section to be regulated based on this sensitivity, thereby transforming the traditional fixed transmission limit into a dynamic elastic boundary based on the real-time operating conditions of the power grid. Finally, this corrected power upper limit is used as a constraint and substituted into a model with the objective function of minimizing power grid regulation costs for joint optimization regulation of the power grid. Under the premise of ensuring the static stability safety baseline of the system, it adaptively releases the transmission potential of the lines, reducing unnecessary preventative control actions, thus achieving proactive prevention and control of limit exceedance risks at a lower cost, balancing the safety of power grid operation with the economy of active regulation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 The flowchart of the active control method for power grid is illustrated schematically; Figure 2 The flowchart illustrates a process for regulating the power grid with the objective function of minimizing grid regulation costs, under constraints including the aforementioned modified power limit. Figure 3 The schematic diagram illustrates a structural block diagram of an example of an active power grid control device according to the present invention; Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0019] In existing technologies, the system passively seeks scheduling schemes only within a fixed power boundary, ignoring the remaining transmission potential of the system under the current operating conditions while ensuring safety. This leads to excessive preventative control actions and makes it difficult to guarantee the economy of proactive regulation.

[0020] Figure 1 The flowchart of the active control method for the power grid is illustrated schematically.

[0021] like Figure 1 As shown, the method includes operations S110~S150.

[0022] In operation S110, identify the transmission sections to be regulated that are predicted to experience power overruns.

[0023] Power exceeding the limit refers to the real-time or predicted power of a transmission section or line exceeding the preset transmission power limit during operation. This limit is usually set based on the static thermal stability limit of the equipment or the safety and stability requirements of the system.

[0024] According to embodiments of the present invention, historical operating data can be input into pre-trained short-term load forecasting and renewable energy output forecasting models (such as forecasting models based on LSTM or GCN) to generate power demand and power output curves for each node within a predetermined future time period. Based on the aforementioned forecast data, the future operating state of the power grid can be simulated, thereby identifying potential power limit exceedance risks in advance. When a power limit exceedance risk is predicted for a certain section, that section can be identified as a transmission section to be regulated.

[0025] In operation S120, the current static stability reserve coefficient is determined based on the current operating status of the transmission section to be regulated.

[0026] The static stability reserve factor is a quantitative indicator that measures the operating distance or safety margin of a power system under a given operating condition from static instability (such as power angle loss or voltage collapse).

[0027] According to an embodiment of the present invention, the current operating state can refer to the set of electrical parameters of the transmission section to be regulated at the current moment when the regulation assessment is being performed.

[0028] For example, given the current operating state, including the current power limit of the transmission section to be regulated at the current operating moment and the current transmission power, the current static stability reserve coefficient can be calculated using the following formula: (1) in, The static stability reserve coefficient at time t , This is the current power limit. Let be the current transmission power of the i-th transmission section at time t.

[0029] In operation S130, when the current static stability reserve coefficient does not meet the safety margin condition, calculate the stability coefficient sensitivity of the transmission section to be regulated.

[0030] According to an embodiment of the present invention, the safety margin condition includes the case where the static stability reserve coefficient is greater than or equal to a preset lower limit value of the static stability reserve coefficient.

[0031] For example, in In this case, the stability coefficient sensitivity of the transmission section to be regulated is calculated. Among them, This is the lower limit of the preset static stability reserve coefficient.

[0032] When the current static stability reserve coefficient does not meet the safety margin condition, the stability coefficient sensitivity can be calculated using the following formula. : (2) in, and These represent the static stability reserve coefficient and the transmission power of the transmission section to be regulated at time t-1, respectively.

[0033] In operation S140, the upper limit of the corrected power of the transmission section to be regulated is determined based on the sensitivity of the static stability reserve coefficient of the transmission section to the transmission power.

[0034] According to an embodiment of the present invention, the modified power limit refers to a dynamic power threshold that balances system security and transmission potential, obtained by adjusting the initial power limit previously set by the power grid based on the real-time security status of the power grid.

[0035] According to an embodiment of the present invention, the deviation between the current static stability reserve coefficient and the lower limit of the static stability reserve coefficient can be determined. Then, using sensitivity as a conversion factor, the deviation is converted into a corresponding power adjustment increment. Finally, the current transmission power is compensated or corrected based on the obtained power adjustment increment, thereby determining a corrected power upper limit that ensures the system's static stability reserve coefficient is exactly within a preset safety range.

[0036] In operation S150, the grid is regulated with the objective function of minimizing grid regulation costs, under constraints including a modified power limit.

[0037] According to an embodiment of the present invention, with the goal of minimizing power grid regulation costs, the following formula can be used: (3) in, To reduce the cost of power grid regulation, The number of time periods within the scheduling duration; A collection of generators; For generator sets At any moment of efforts, This is a generator set. At any moment Operating costs in the next time period. For nodes At any moment The amount of load removed, This is the penalty factor. Typically, the operating cost of a generating unit is a quadratic function: (4) in , and It is the fuel cost coefficient of the generator.

[0038] In one illustrative embodiment, the upper limit of the corrected power for the transmission section to be regulated is determined based on the sensitivity of the static stability reserve coefficient of the transmission section to the transmission power. This includes: determining the historical transmission power and historical static stability reserve coefficient at historical operating times; determining the sensitivity based on the current transmission power, the current static stability reserve coefficient, the historical transmission power, and the historical static stability reserve coefficient; and determining the upper limit of the corrected power based on the current transmission power, the current static stability reserve coefficient, a preset lower limit of the static stability reserve coefficient, and the sensitivity.

[0039] According to an embodiment of the present invention, historical transmission power and the corresponding system transmission power upper limit can be determined from a historical database, and the historical static reserve coefficient for the corresponding historical time can be determined based on the historical transmission power and the system transmission power upper limit.

[0040] For example, the stability coefficient sensitivity at the current moment can be obtained according to equation (2). And the upper limit of the corrected power can be obtained according to the following formula. : (5) According to embodiments of the present invention, constraints may include: (6) Figure 2 The flowchart illustrates a process for regulating the power grid with the objective function of minimizing grid regulation costs, under constraints including a modified power limit.

[0041] like Figure 2 As shown, operation S150 includes operations S210~S230.

[0042] In operation S210, a safe power range is constructed based on the preset lower limit and upper limit of the static stability reserve coefficient, as well as the current transmission power of the transmission section to be regulated.

[0043] For example, the safe power range can be represented in the following form: (7) in, This is the preset lower limit value of the static stability reserve coefficient; This is the preset upper limit value of the static stability reserve coefficient; This represents the optimal power limit.

[0044] This safe power range clarifies the safe range for adjusting the power limit, thus ensuring that the optimal power limit obtained through optimization retains a safe reserve capacity that is not lower than the bottom line, while not exceeding the maximum allowable reasonable margin.

[0045] In operation S220, the modified power upper limit is optimized within the safe power range to determine the optimal power upper limit that minimizes the grid regulation cost.

[0046] For example, the upper limit of the corrected power can be adjusted by iterating step by step within the safe power range according to a preset step size to determine the optimal upper limit of the power. Alternatively, the optimal upper limit of the power can be found based on the already determined upper limit of the corrected power by using a genetic algorithm or a particle swarm optimization algorithm.

[0047] According to an embodiment of the present invention, the optimal power limit also needs to satisfy the following condition: (8) (9) in, This represents the set of constraints that must be satisfied.

[0048] In operation S230, the optimal power limit is updated to the constraints to solve for economic dispatch and generate control commands for regulating the power grid.

[0049] According to embodiments of the present invention, constraints may include: (10) By optimizing within the safe power range to obtain the optimal power limit that minimizes grid control costs, transmission potential can be fully released while ensuring safety, thereby minimizing the control costs caused by load shedding or reducing unit output.

[0050] In one illustrative embodiment, the method further includes determining the current power limit of the transmission section to be regulated as the modified power limit, provided that the current static stability reserve coefficient meets the safety margin condition.

[0051] In one illustrative embodiment, the constraints also include generation-load balance constraints, unit output upper and lower limit constraints, and unit ramping constraints.

[0052] According to an embodiment of the present invention, the power generation-load balance constraint is as follows: (11) in, For generator set, For load aggregation, This is a collection of routes. For load At any moment The predicted value, For the line at time The loss.

[0053] According to an embodiment of the present invention, the upper and lower limits of the unit output are constrained as follows: (12) For the unit The upper limit of output, Indicates the lower limit of output.

[0054] According to an embodiment of the present invention, the unit ramp-up constraint is as follows: (13) in, For generator sets Maximum downhill climbing rate, For generator sets The maximum uphill climbing rate should be calculated by varying the selected time scale.

[0055] The active power grid control device provided by the present invention is described below. The active power grid control device described below and the active power grid control method described above can be referred to in correspondence.

[0056] Figure 3 The diagram illustrates a structural block diagram of an example of an active power grid control device according to the present invention.

[0057] like Figure 3 As shown, the power grid active control device 300 includes an identification module 310, a reserve coefficient determination module 320, a sensitivity determination module 330, a power upper limit correction module 340, and a control module 350.

[0058] The identification module 310 is used to identify the transmission section to be regulated that is predicted to exceed the power limit.

[0059] The reserve coefficient determination module 320 is used to determine the current static stability reserve coefficient based on the current operating status of the transmission section to be regulated.

[0060] The sensitivity determination module 330 is used to calculate the stability coefficient sensitivity of the transmission section to be regulated when the current static stability reserve coefficient does not meet the safety margin condition. The power upper limit correction module 340 is used to determine the corrected power upper limit of the transmission section to be regulated based on the sensitivity of the static stability reserve coefficient of the transmission section to the transmission power. The control module 350 is used to control the power grid with the objective function of minimizing the power grid control cost, under constraints including a modified power limit.

[0061] Figure 4 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4As shown, the electronic device may include a processor 410, a communications interface 420, a memory 430, and a communication bus 440. The processor 410, communications interface 420, and memory 430 communicate with each other via the communication bus 440. The processor 410 can call logic instructions stored in the memory 430 to execute the aforementioned active power grid control method.

[0062] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0063] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the active power grid control method provided by the above methods.

[0064] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the active power grid control methods provided by the above methods.

[0065] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0066] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0067] 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for active control of a power grid, characterized in that, include: Identify and predict the power limit exceedance of the transmission sections to be regulated; Based on the current operating status of the transmission section to be regulated, determine the current static stability reserve coefficient; If the current static stability reserve coefficient does not meet the safety margin condition, calculate the stability coefficient sensitivity of the transmission section to be regulated. Based on the sensitivity of the static stability reserve coefficient of the transmission section to be regulated to the transmission power, the upper limit of the corrected power of the transmission section to be regulated is determined. The grid is regulated with the goal of minimizing grid regulation costs, under constraints including the aforementioned modified power limit.

2. The active power grid control method according to claim 1, characterized in that, The current operating status includes the current power limit and current transmission power of the transmission section to be regulated at the current operating moment.

3. The active power grid control method according to claim 2, characterized in that, The regulation of the power grid, with the objective function of minimizing grid control costs, under constraints including the modified power upper limit, includes: Based on the preset lower limit and upper limit of the static stability reserve coefficient, and the current transmission power of the transmission section to be regulated, a safe power range is constructed. Within the safe power range, the modified power upper limit is optimized to determine the optimal power upper limit that minimizes the power grid regulation cost; The optimal power limit is updated to the constraints to solve for economic dispatch, generating control commands for regulating the power grid.

4. The active power grid control method according to claim 2, characterized in that, The determination of the corrected power upper limit of the transmission section to be regulated, based on the sensitivity of the static stability reserve coefficient of the transmission section to the transmission power, includes: Determine the historical transmission power and historical static stability reserve coefficient at historical operating times; The sensitivity is determined based on the current transmission power, the current static stability reserve coefficient, the historical transmission power, and the historical static stability reserve coefficient. The upper limit of the corrected power is determined based on the current transmission power, the current static stability reserve coefficient, the preset lower limit of the static stability reserve coefficient, and the sensitivity.

5. The active power grid control method according to claim 1, characterized in that, Also includes: If the current static stability reserve coefficient meets the safety margin condition, the current power upper limit of the transmission section to be regulated is determined as the corrected power upper limit.

6. The active power grid control method according to claim 1, characterized in that, The constraints also include power generation-load balance constraints, unit output upper and lower limit constraints, and unit ramping constraints.

7. A power grid active control device, characterized in that, include: The identification module is used to identify the transmission sections to be regulated that are predicted to exceed power limits; The reserve coefficient determination module is used to determine the current static stability reserve coefficient based on the current operating status of the transmission section to be regulated. The sensitivity determination module is used to calculate the stability coefficient sensitivity of the transmission section to be regulated when the current static stability reserve coefficient does not meet the safety margin condition. The power upper limit correction module is used to determine the corrected power upper limit of the transmission section to be regulated based on the sensitivity of the static stability reserve coefficient of the transmission section to the transmission power. The control module is used to control the power grid with the objective function of minimizing the power grid control cost, under constraints including the modified power limit.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the active power grid control method as described in any one of claims 1 to 6.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the active power grid control method as described in any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the active power grid control method as described in any one of claims 1 to 6.

Images