Long-distance power transmission channel section limit adjustment method and system based on operation mode adjustment

Abstract

The invention discloses a long-distance power transmission channel section limit adjusting method and system based on operation mode adjustment, and the method comprises the steps: giving an auxiliary decision suggestion of a key section through given power grid operation data, historical data of each section of a power grid, section limit and power transmission channel blocking amount, and through blocking amount analysis and light and heavy load analysis; through analysis and calculation, a key section limit adjustment method in a typical operation mode is given, and the purposes of improving the section limit and releasing the transmission capacity of a power transmission channel are achieved.

Description

Technical Field

[0001] The present invention relates to a power grid dispatching method, and in particular to a method and system for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment. Background Art

[0002] In the new power system, the transmission capacity of the power grid, like the power balancing capacity, is one of the key factors restricting the consumption of new energy. With the continuous increase in the scale of new energy access and the continuous construction and operation of ultra-high voltage AC and DC transmission channels, the operating characteristics of long-distance transmission channels are becoming more and more complex. The characteristics of new energy power generation, such as volatility, low controllability and incomplete predictability, are affected by natural factors. This has brought obvious uncertainty factors to long-distance large-scale new energy transmission. The analysis of traditional transmission channels and cross-section restrictions is based on reasonable boundary conditions such as power generation output, load demand, and operation and maintenance arrangements. The uncertainty of new energy power generation makes the determination of the above boundary conditions very difficult. There is a lack of sufficient theoretical and methodological support. The transmission channel has an explosion of uncertain scenario combinations, complex factors restricting the transmission of new energy, and a high level of uncertainty. In order to solve the problems of time-space coordination difficulties in cascade transmission channels, it is urgent to conduct research on typical operating modes and section obstruction factors of cascade transmission channels, and provide corresponding section limit strategies for different typical operating modes; on the other hand, the operating limits of important transmission sections under the typical mode of traditional power grid are conservative, and fail to track the changes in the operation mode of the power grid and adaptively give real-time stable transmission limits. There is a lack of tracking and monitoring capabilities for the stable transmission limits of new energy transmission sections. The model-driven transmission section transmission limit calculation and corresponding regulation and optimization decision-making technology face problems such as a substantial increase in power grid dimensions, poor timeliness of stability verification, and high requirements for algorithm robustness of the optimization model. Summary of the invention

[0003] Purpose of the invention: In view of the above problems, the present invention proposes a method and system for adjusting the section limit of a long-distance transmission channel based on operation mode adjustment, which can track changes in the operation mode of the power grid and adaptively provide real-time stable transmission limits, so as to achieve the purpose of increasing the section limit and releasing the transmission capacity of the transmission channel.

[0004] Technical solution: The technical solution adopted by the present invention is a method for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment, comprising the following steps:

[0005] (1) Collecting operation data of a long-distance transmission channel section, wherein the basic data varies with different operation modes;

[0006] (2) calculating the average real-time power of the cross section according to the operating data;

[0007] (3) calculating the maximum adjustable section limit value based on the operating data and the average real-time power of the section;

[0008] (4) calculating an adjusted section overload rate according to the operating data and the maximum adjustable section limit; wherein the adjusted section overload rate is the ratio between the section real-time maximum active power and the section limit; the section real-time maximum active power is calculated by adding the section real-time active power of transmission to the maximum adjustable section limit;

[0009] (5) If the adjusted section load factor H′ i Lower than or equal to the overload rate index data value H i , the adjustable range is set to the maximum adjustable section limit obtained in step (3); if the adjusted section overload rate H′ i Higher than the overload rate index data value H i , then recalculate the maximum adjustable section limit, the calculation formula is: Vmax i =H i ·L i -P i , where Vmax i H is the maximum adjustable section limit. i is the overload rate index data value, L i is the cross-sectional limit of the long-distance transmission channel section, P i It is the real-time active power transmission of the long-distance transmission channel section.

[0010] The operation data include: section limit data of long-distance transmission channel sections, real-time active power data of long-distance transmission channel sections, historical active power data of long-distance transmission channel sections, section maximum limit data and overload rate index data of long-distance transmission channel sections.

[0011] Calculating the average real-time power of the section according to the operating data includes: calculating the average value of the historical power within the operating time T according to the historical active power of the long-distance transmission channel section to obtain the average real-time power of the section.

[0012] The calculation of the adjusted section overload rate based on the operating data and the maximum adjustable value of the section limit includes: calculating the maximum adjustable value of the section limit based on the operating data and the average real-time power of the section includes: subtracting the average real-time power of the section from the maximum value of the section limit to obtain the maximum adjustable value of the section limit.

[0013] Calculating the adjusted section overload rate based on the operating data and the maximum adjustable value of the section limit includes: calculating the adjusted section overload rate based on the real-time active power data of the long-distance transmission channel section, the maximum adjustable value of the section limit and the section limit data of the long-distance transmission channel section.

[0014] If the maximum adjustable section limit value calculated in step (5) has no positive solution, it is determined that the line is overloaded.

[0015] The present invention proposes a long-distance power transmission channel section limit adjustment system based on operation mode adjustment, including a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the long-distance power transmission channel section limit adjustment method based on operation mode adjustment is implemented.

[0016] The present invention proposes a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method for adjusting the cross-section limit of a long-distance power transmission channel based on operating mode adjustment is implemented.

[0017] The present invention proposes a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the method for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment is implemented.

[0018] The present invention proposes a computer program product, including a computer program and / or instructions, which, when executed by a processor, implements the method for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment.

[0019] Beneficial effects: Compared with the prior art, the present invention has the following advantages: Compared with the conservativeness of the operating limit of the important transmission section of the long-distance transmission channel under the typical mode of the power grid, the present invention calculates the section limit adjustment value of the long-distance transmission channel according to the relevant data of the operating mode, and can track the changes in the power grid operation mode and adaptively give the real-time stable transmission limit, thereby improving the tracking and monitoring capability of the stable transmission limit of the new energy transmission section. The present invention solves the problems encountered in long-distance transmission control, such as the substantial increase in grid dimensions, poor timeliness of stability verification, and high requirements for algorithm robustness of the optimization model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The invention provides a method for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment;

[0021] Figure 2 is a schematic diagram of the power transmission channel and cross-sectional structure in this embodiment 1;

[0022] Figure 3 It is the auxiliary decision-making interface diagram in the auxiliary software for transmission channel obstruction analysis and refined grading regulation. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Example 1

[0025] The flow chart of the method for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment described in the present invention is as follows: Figure 1 This method is used for cross-section limit adjustment of long-distance transmission channels. The schematic diagram of the transmission channel and cross-section structure is shown in Figure 2 As shown: Figure 2 The main line (blue) in the figure is the transmission channel, the blue dot in the middle is the transmission section, and the orange dot refers to other lines or small power stations connected or sent between the transmission sections. This method uses the grid operation data, historical data of each section of the grid, and section limits, and provides auxiliary decision-making suggestions for key sections through obstruction analysis and light and heavy load analysis. The safety range of section limits is the difference between the section limit of the long-distance transmission section and the maximum section limit given by the power dispatching department. It specifically includes the following steps:

[0026] (1) Collecting operation data of long-distance transmission channel sections, wherein the basic data varies with different operation modes; the operation data includes: section limit data set of long-distance transmission channel sections, real-time transmission active power data set of long-distance transmission channel sections, historical transmission active power of long-distance transmission channel sections, section maximum limit data set, and overload rate index data of long-distance transmission channel sections provided by the power dispatching department.

[0027] The overload rate is the ratio of the average active power to the maximum transmission power of the channel. If it does not exceed the overload rate, it is not overloaded. Because of different geographical locations, wiring and other specific conditions, the overload rate may be defined as multiple different values ​​in different transmission sections, such as 80%, 85%, 90%. If it exceeds this value, it is defined as overloaded.

[0028] like Figure 2 As shown in the figure, the transmission channel S consists of transmission sections S1, S2, S3, ..., S n The cross-sectional limit data set L1, L2, ..., L n The maximum cross-sectional limits of each section of the transmission channel S are Pmax1, Pmax2, Pmax3, ..., Pmax n The operation time is T, and the real-time active power of each section of the transmission channel S is P1, P2, P3, ..., P n .

[0029] (2) The historical active power of the long-distance transmission channel section is used to calculate the average value of the historical power within the operating time range T to obtain the average real-time power of the section. In general, the operating time range T will use 1 month of data as the basis. Depending on the season and location, the data within 3 months of operation may also be used as an indicator, generally not exceeding 3 months. The operating time range T can be adjusted as needed.

[0030] The average real-time power of each transmission section during the operation time is calculated by the real-time active power of each section of the transmission channel S, and the average real-time power of each section P1', P2', P3', ..., P n '.

[0031] (3) Calculate the maximum adjustable section limit based on the section maximum limit data set and the section average real-time power.

[0032] The maximum value of the section limit Pmax i Subtract the average real-time power P of the section i ', get the maximum adjustable section limit Vmax i .

[0033] (4) Calculate the adjusted section overload rate based on the real-time active power data set of the long-distance transmission channel section, the maximum adjustable section limit, and the section limit data set of the long-distance transmission channel section. The adjusted section overload rate is the ratio between the real-time maximum active power of the section and the section limit. The real-time maximum active power of the section is calculated by adding the real-time active power of the section to the maximum adjustable section limit.

[0034]

[0035] After calculation, the adjusted cross-section load rate is H1, H2, H3, ... H n .

[0036] (5) If the adjusted section load factor H′ i Lower than the overload rate indicator data value H i , then the adjustable range is set to the cross-section overload rate H′ i The corresponding adjustable range is the maximum adjustable value Vmax of the cross-section limit obtained in step (3). i If the adjusted section load rate H′ i Higher than the overload rate indicator data value H i , then recalculate the maximum adjustable section limit, that is, Vmax i =H i ·L i -P iThe subsequent cross-section adjustment range in the transmission channel is used to calculate the overload rate. The active power adjustment range of the subsequent cross-section after adjustment is the maximum value of each subsequent cross-section that remains below the maximum limit of the cross-section after the actual power is added to the adjustable range.

[0037] (6) The adjustment range of each section after adjustment is 0~Vmax i , the cross-section limit adjustment value given by this method, if there is no positive solution, then this method has no solution. This situation indicates that the calculated average real-time power is overloaded, and no strategy can be given at this time.

[0038] Example 2

[0039] The long-distance transmission channel section limit adjustment system based on operation mode adjustment described in the present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the above-mentioned long-distance transmission channel section limit adjustment method based on operation mode adjustment when executing the computer program. The long-distance transmission channel section limit adjustment system based on operation mode adjustment described in the present invention is a submodule in the transmission channel obstruction analysis and refined grading adjustment auxiliary software, which is used for auxiliary decision-making of long-distance transmission channel section limit adjustment. The software is deployed in various dispatching and control centers in the form of web services, and dispatchers can see it by clicking on it without performing actual distribution and control operations. The auxiliary decision-making interface in the transmission channel obstruction analysis and refined grading adjustment auxiliary software is as follows: Figure 3 As shown, the final output section limit adjustment value is the adjustment value of the section that needs to be adjusted, which is displayed in the auxiliary decision module of the software. For example, it is displayed on the page: "XX section" has an upper limit of "5150".

[0040] Example 3

[0041] In one embodiment, a computer device is provided, including 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 above-mentioned method for adjusting the section limit of a long-distance power transmission channel based on operating mode adjustment is implemented.

[0042] Example 4

[0043] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method for adjusting the section limit of a long-distance power transmission channel based on operation mode adjustment is implemented.

[0044] Example 5

[0045] In one embodiment, a computer program product is provided, including a computer program / instruction, which, when executed by a processor, implements the method for adjusting the section limit of a long-distance power transmission channel based on operation mode adjustment.

[0046] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0047] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0048] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0049] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

Claims

1. A method for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment, characterized in that: The following steps are involved: (1) Collecting operation data of a long-distance transmission channel section, wherein the basic data varies with different operation modes; (2) calculating the average real-time power of the cross section according to the operating data; (3) calculating the maximum adjustable section limit value based on the operating data and the average real-time power of the section; (4) calculating an adjusted section overload rate according to the operating data and the maximum adjustable section limit; wherein the adjusted section overload rate is the ratio between the section real-time maximum active power and the section limit; the section real-time maximum active power is calculated by adding the section real-time active power of transmission to the maximum adjustable section limit; (5) If the adjusted section load factor H′ i Lower than or equal to the overload rate index data value H i , the adjustable range is set to the maximum adjustable section limit obtained in step (3); if the adjusted section overload rate H′ i Higher than the overload rate indicator data value H i , then recalculate the maximum adjustable section limit, the calculation formula is: Vmax i =H i ·L i -P i , where Vmax i H is the maximum adjustable section limit. i is the overload rate index data value, L i is the cross-sectional limit of the long-distance transmission channel section, P i It is the real-time active power transmission of the long-distance transmission channel section.

2. The method for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment according to claim 1 is characterized in that: The operation data include: section limit data of long-distance transmission channel sections, real-time active power data of long-distance transmission channel sections, historical active power data of long-distance transmission channel sections, section maximum limit data and overload rate index data of long-distance transmission channel sections.

3. The method for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment according to claim 2 is characterized in that: Calculating the average real-time power of the section according to the operating data includes: calculating the average value of the historical power within the operating time T according to the historical active power of the long-distance transmission channel section to obtain the average real-time power of the section.

4. The method for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment according to claim 1 is characterized in that: The calculation of the adjusted section overload rate based on the operating data and the maximum adjustable value of the section limit includes: calculating the maximum adjustable value of the section limit based on the operating data and the average real-time power of the section includes: subtracting the average real-time power of the section from the maximum value of the section limit to obtain the maximum adjustable value of the section limit.

5. The method for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment according to claim 1 is characterized in that: Calculating the adjusted section overload rate based on the operating data and the maximum adjustable value of the section limit includes: calculating the adjusted section overload rate based on the real-time active power data of the long-distance transmission channel section, the maximum adjustable value of the section limit and the section limit data of the long-distance transmission channel section.

6. The method for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment according to claim 1 is characterized in that: If the maximum adjustable section limit value calculated in step (5) has no positive solution, it is determined that the line is overloaded.

7. A cross-section limit adjustment system for a long-distance power transmission channel based on operation mode adjustment, 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 computer program, the method for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment according to any one of claims 1 to 6 is implemented.

8. A computer 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 computer program, the method for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment according to any one of claims 1 to 6 is implemented.

9. A 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 adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment according to any one of claims 1 to 6 is implemented.

10. A computer program product comprising a computer program and / or instructions, characterized in that: When the computer program and / or instruction is executed by a processor, the method for adjusting the cross-section limit of a long-distance power transmission channel based on operation mode adjustment described in any one of claims 1 to 6 is implemented.

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