A control method for primary frequency modulation dead zone of a wind farm energy management platform

Abstract

The application provides a wind farm energy management platform primary frequency modulation dead zone control method, system, terminal and medium, and belongs to the technical field of wind farm energy management and control. The method first determines whether the current frequency modulation is in the primary frequency modulation dead zone test stage through a preset judgment logic, if it is confirmed, the frequency modulation target change value is calculated, and the first target unit meeting the active interval mode is selected based on the value, if the first unit adjustable power meets the requirement and the preset allocated power is not less than the fine adjustment threshold, the power is directly issued to the first target unit. If not, the second unit is selected, and the power distribution and issuance are carried out according to similar conditions, if the sum of the adjustable power of the two units still does not meet the requirement, more units are continuously selected until the sum of the power of the units is equal to the frequency modulation target change value, and the power distribution and issuance decision is completed. The application ensures the stability and efficiency of the wind farm in the frequency modulation process, and improves the intelligent level of energy management.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind farm energy management and control, and particularly relates to a control method and system for primary frequency modulation dead zone of a wind farm energy management platform, a terminal and a medium. BACKGROUND

[0002] In the daily operation and maintenance of power systems, it is crucial to ensure the stability of the grid frequency. As shown in the prior art, the traditional primary frequency modulation strategy mainly relies on the energy management platform (EMS) to receive and process the latest frequency modulation target value, and then issues adjustment instructions to the power of each unit. This strategy can effectively maintain the stability of the grid frequency in most cases, but in some specific situations, especially when the primary frequency modulation dead zone test is performed, the potential problems gradually emerge. Figure 1 In the primary frequency modulation dead zone test, due to the relatively small range of frequency modulation power changes, it may be lower than the coarse adjustment threshold set by the EMS platform. This means that even if the grid frequency changes need to be adjusted, the EMS platform may not be able to issue corresponding dispatch instructions because the power change does not reach its response threshold. This situation not only leads to the inability to adjust the grid frequency in a timely manner, but also further affects the stability and safety of the power system.

[0003] In addition, even if the EMS platform can respond to the frequency modulation instructions of small power changes and issue adjustment instructions to the power of each unit in the entire field, it is often prone to overshoot. Overshoot refers to the adjustment amount of the unit power exceeding the actual need, which not only wastes energy, but also may adversely affect the stable operation of the unit. In particular, in large power systems, the stability of the entire field of units is crucial to the safe operation of the entire grid. The occurrence of overshoot undoubtedly increases the risk of unit failure, thereby threatening the stability and reliability of the grid.

[0004] Therefore, it is necessary to explore a new control adjustment method that can effectively reduce the power fluctuation when the primary frequency modulation dead zone is triggered while ensuring that the power of the entire field can accurately follow the dispatch instructions, thereby improving the stability of the unit.

[0005] SUMMARY In view of the deficiencies in the prior art, the present application proposes a control method and system for primary frequency modulation dead zone of a wind farm energy management platform, a terminal and a medium to solve the technical problems existing in the prior art.

[0006] The technical solution adopted by the present application is as follows:

[0007]

[0008] ​A first aspect of this embodiment provides a method for controlling a primary frequency modulation dead zone of a wind farm energy management platform, wherein the method is applied to a wind power generation energy management system and includes:

[0009] Based on the preset judgment logic, determine whether the current frequency modulation is a frequency modulation dead zone test;

[0010] If it is a single frequency modulation dead zone test, calculate the frequency modulation target change value;

[0011] Based on the frequency regulation target change value, selecting a first target unit that meets the active power interval mode;

[0012] If the adjustable power of the first destination unit is greater than or equal to the frequency regulation target change value, and the preset power allocated to the first destination unit is greater than the fine adjustment threshold corresponding to the first destination unit, the wind power generation energy management system transmits power to the first destination unit;

[0013] If the adjustable power of the first destination unit is less than the frequency regulation target change value, continue to select the second destination unit that meets the active power interval mode;

[0014] If the sum of the adjustable powers of the first destination unit and the second destination unit is greater than or equal to the frequency regulation target change value, and the power preset allocated to the first destination unit is greater than the fine adjustment threshold corresponding to the first destination unit, and the power preset allocated to the second destination unit is greater than the fine adjustment threshold corresponding to the second destination unit, then the wind power generation energy management system delivers power to the first and second destination units;

[0015] If the sum of the adjustable powers of the first destination unit and the second destination unit is greater than or equal to the frequency regulation target change value, and among the powers preset to be allocated to the first destination unit and the powers preset to be allocated to the second destination unit, there is a destination unit whose preset allocated power is less than or equal to its fine-tuning threshold, then the destination units whose preset allocated power is less than or equal to its fine-tuning threshold are eliminated, and the wind power generation energy management system sends power to the destination units whose preset allocated power is greater than its fine-tuning threshold;

[0016] If the sum of the adjustable powers of the first destination unit and the second destination unit is less than the frequency regulation target change value, the wind power generation energy management system repeats the power allocation and issuance decision process for the first destination unit and the second destination unit until the sum of the adjustable powers of several destination units is equal to the frequency regulation target change value and the wind power generation energy management system has completed the power allocation and issuance decision process for several destination units, then the scheduling is ended.

[0017] Furthermore, judging whether the current frequency modulation is a frequency modulation dead zone test based on a preset judgment logic includes:

[0018] Obtain the primary frequency modulation target value m of the wind turbine following the frequency issued by the power grid for frequency modulation scheduling, the current full-field initial issued power value P start and the wind farm capacity value n.

[0019] The primary frequency modulation target value m, the current full-field initial issued power value P start and the wind farm capacity value n are brought into the preset judgment logic to determine whether the current frequency modulation is a primary frequency modulation dead zone test.

[0020] Further, the preset judgment logic is expressed as:

[0021]

[0022] Among them, the active control mode C=1 represents normal primary frequency modulation issuance, and the active control mode C=2 represents primary frequency modulation dead zone test.

[0023] Further, the frequency target change value is calculated by the following expression:

[0024] Δt = |m-P start |

[0025] Among them, Δt is the frequency target change value, m is the primary frequency modulation target value, P start is the current full-field initial issued value.

[0026] Further, the adjustable power of a target unit is calculated by the following expression:

[0027] P 可调 = |P y -P max |

[0028] Among them, P 可调 is the adjustable power of the target unit, P y is the active power of the target unit, and P max is the maximum set value of the active power of the target unit.

[0029] Further, the fine adjustment threshold value corresponding to the target unit is calculated by the following expression:

[0030]

[0031] Among them, l is the fine adjustment threshold value, and P e is the rated power of the target unit.

[0032] The second aspect of the embodiment provides a primary frequency modulation dead zone control system of a wind farm energy management platform, the system comprising:

[0033] The frequency modulation judgment module is configured to judge whether the current frequency modulation is a one-time frequency modulation dead zone test based on a preset judgment logic.

[0034] The frequency modulation target calculation module is configured to calculate a frequency modulation target change value if the current frequency modulation is a one-time frequency modulation dead zone test.

[0035] The unit selection module is configured to select a first target unit that meets the active interval mode based on the frequency modulation target change value.

[0036] The power issuing module is configured to issue power to the first target unit if the adjustable power of the first target unit is greater than or equal to the frequency modulation target change value, and the preset power allocated to the first target unit is greater than the fine adjustment threshold corresponding to the first target unit.

[0037] The unit selection module further includes: if the adjustable power of the first target unit is less than the frequency modulation target change value, continue to select a second target unit that meets the active interval mode.

[0038] The power issuing module further includes: if the sum of the adjustable power of the first target unit and the second target unit is greater than or equal to the frequency modulation target change value, and the preset power allocated to the first target unit is greater than the fine adjustment threshold corresponding to the first target unit, and the preset power allocated to the second target unit is greater than the fine adjustment threshold corresponding to the second target unit, issue power to the first and second target units.

[0039] If the sum of the adjustable power of the first target unit and the second target unit is greater than or equal to the frequency modulation target change value, and among the preset power allocated to the first target unit and the preset power allocated to the second target unit, there is a target unit whose preset allocated power is less than or equal to its fine adjustment threshold, the target unit whose preset allocated power is less than or equal to its fine adjustment threshold is excluded, and power is issued to the target unit whose preset allocated power is greater than its fine adjustment threshold.

[0040] The dispatching end judgment module is configured to repeat the power allocation and issuing decision process for the first target unit and the second target unit if the sum of the adjustable power of the first target unit and the second target unit is less than the frequency modulation target change value, until the sum of the adjustable power of a plurality of target units is equal to the frequency modulation target change value and the power allocation and issuing decision process for the plurality of target units is completed, and then end the dispatching.

[0041] The third aspect of the embodiment provides a terminal, including a processor, an input device, an output device and a memory, the processor, the input device, the output device and the memory are connected with each other, wherein the memory is used to store a computer program, the computer program includes program instructions, the processor is configured to call the program instructions, and the method is executed as any one of the first aspect of the embodiment.

[0042] The fourth aspect of the embodiment provides a computer readable storage medium, which stores a computer program, the computer program comprising program instructions, the program instructions causing a processor to execute the method according to any one of the first aspect of the embodiment when executed by the processor.

[0043] From the above technical solution, the beneficial technical effects of the present application are as follows:

[0044] 1. The optimized energy management platform control logic of the present application, when identifying the primary frequency modulation dead zone state trigger, will adaptively find the unit that meets the power change, effectively reducing the participation of the unit in the dead zone frequency modulation, maximizing the control variable, and adjusting the power with the least unit, thereby improving the stability of the unit in the frequency modulation state. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0046] Figure 1 The original primary frequency modulation scheduling flowchart in the prior art of the present application;

[0047] Figure 2 The primary frequency modulation dead zone test logic diagram of the embodiment of the present application;

[0048] Figure 3 The system schematic diagram of the embodiment of the present application;

[0049] Figure 4 The terminal schematic diagram of the embodiment of the present application. DETAILED DESCRIPTION

[0050] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0051] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meaning understood by the skilled person in the field to which the present application belongs.

[0052] EMBODIMENT

[0053] The embodiment provides a control method for the primary frequency modulation dead zone of the wind farm energy management platform, as shown in Figure 2 The method comprises the following steps:

[0054] Based on the preset judgment logic, it is judged whether the current frequency modulation is a primary frequency modulation dead zone test, specifically:

[0055] The primary frequency modulation target value m of the wind turbine following the frequency issued by the power grid for frequency modulation scheduling, the current full-field initial issued power value P start and the wind farm capacity value n are obtained.

[0056] The primary frequency modulation target value m, the current full-field initial issued power value P start and the wind farm capacity value n are brought into the preset judgment logic to judge whether the current frequency modulation is a primary frequency modulation dead zone test.

[0057] The preset judgment logic is represented as:

[0058]

[0059] Among them, the active control mode C=1 represents normal primary frequency modulation issuance, and the active control mode C=2 represents primary frequency modulation dead zone test.

[0060] In an embodiment, if the primary frequency modulation target value m, the current full-field initial issued power value P start and the wind farm capacity value n are brought into the preset judgment logic, it is judged that the current frequency modulation is not a primary frequency modulation dead zone test, and then the primary frequency modulation is normally issued.

[0061] In an embodiment, if the primary frequency modulation target value m, the current full-field initial issued power value P start and the wind farm capacity value n are brought into the preset judgment logic, it is judged that the current frequency modulation is a primary frequency modulation dead zone test; then the frequency modulation target change value is calculated through the following expression:

[0062] Δt = |m-P start |

[0063] Among them, Δt is the frequency modulation target change value, m is the primary frequency modulation target value, P start is the current full-field initial issued value.

[0064] Based on the frequency modulation target change value, a first target unit that meets the active interval mode=1, i.e., can normally generate power, is selected.

[0065] If the adjustable power of the first target unit is greater than or equal to the frequency modulation target change value, and the preset power allocated to the first target unit is greater than the fine adjustment threshold value corresponding to the first target unit, the wind power energy management system issues power to the first target unit.

[0066] If the adjustable power of the first target unit is less than the frequency modulation target change value, a second target unit that meets the active interval mode=1, i.e., can normally generate power, is continuously selected.

[0067] If the sum of the adjustable powers of the first destination unit and the second destination unit is greater than or equal to the frequency regulation target change value, and the power preset allocated to the first destination unit is greater than the fine adjustment threshold corresponding to the first destination unit, and the power preset allocated to the second destination unit is greater than the fine adjustment threshold corresponding to the second destination unit, then the wind power generation energy management system delivers power to the first and second destination units;

[0068] If the sum of the adjustable powers of the first destination unit and the second destination unit is greater than or equal to the frequency regulation target change value, and among the powers preset to be allocated to the first destination unit and the powers preset to be allocated to the second destination unit, there is a destination unit whose preset allocated power is less than or equal to its fine-tuning threshold, then the destination units whose preset allocated power is less than or equal to its fine-tuning threshold are eliminated, and the wind power generation energy management system sends power to the destination units whose preset allocated power is greater than its fine-tuning threshold;

[0069] If the sum of the adjustable powers of the first destination unit and the second destination unit is less than the frequency regulation target change value, the wind power generation energy management system repeats the power allocation and issuance decision process for the first destination unit and the second destination unit until the sum of the adjustable powers of several destination units is equal to the frequency regulation target change value and the wind power generation energy management system has completed the power allocation and issuance decision process for several destination units, then the scheduling is ended.

[0070] Specifically, the adjustable power of a single target unit is calculated using the following expression:

[0071] P 可调 =|P y -P max |

[0072] Among them, P 可调 is the adjustable power of the target unit, P y is the active power that the target unit should generate, P max It is the maximum setting value of active power of the target unit.

[0073] Specifically, the fine-tuning threshold corresponding to the target unit is calculated using the following expression:

[0074]

[0075] Among them, l is the fine-tuning threshold, P e is the rated power of the target unit.

[0076] like Figure 3 As shown, this embodiment provides a control system for the primary frequency regulation dead zone of a wind farm energy management platform, the system comprising:

[0077] The frequency modulation judgment module 101 judges whether the current frequency modulation is a one-time frequency modulation dead zone test based on a preset judgment logic.

[0078] The frequency modulation target calculation module 102 calculates a frequency modulation target change value if it is a one-time frequency modulation dead zone test.

[0079] The unit selection module 103 selects a first target unit that meets the active interval mode based on the frequency modulation target change value.

[0080] The power issuing module 104 issues power to the first target unit if the adjustable power of the first target unit is greater than or equal to the frequency modulation target change value, and the preset power allocated to the first target unit is greater than the fine adjustment threshold value corresponding to the first target unit.

[0081] The unit selection module 103 further comprises: if the adjustable power of the first target unit is less than the frequency modulation target change value, a second target unit that meets the active interval mode is continuously selected.

[0082] The power issuing module 104 further comprises: if the sum of the adjustable power of the first target unit and the second target unit is greater than or equal to the frequency modulation target change value, and the preset power allocated to the first target unit is greater than the fine adjustment threshold value corresponding to the first target unit, and the preset power allocated to the second target unit is greater than the fine adjustment threshold value corresponding to the second target unit, power is issued to the first and second target units.

[0083] If the sum of the adjustable power of the first target unit and the second target unit is greater than or equal to the frequency modulation target change value, and among the preset power allocated to the first target unit and the preset power allocated to the second target unit, there is a target unit whose preset allocated power is less than or equal to its fine adjustment threshold value, the target unit whose preset allocated power is less than or equal to its fine adjustment threshold value is eliminated, and power is issued to the target unit whose preset allocated power is greater than its fine adjustment threshold value.

[0084] The dispatching end judgment module 105 repeats the power allocation and issuing decision process for the first target unit and the second target unit if the sum of the adjustable power of the first target unit and the second target unit is less than the frequency modulation target change value, until the sum of the adjustable power of a plurality of target units is equal to the frequency modulation target change value and the power allocation and issuing decision process for the plurality of target units is completed, then the dispatching is ended.

[0085] As Figure 4As shown, this embodiment provides a terminal, including a processor, an input device, an output device and a memory, wherein the processor, input device, output device and memory are interconnected, wherein the memory is used to store a computer program, and the computer program includes program instructions. The processor is configured to call the program instructions and execute part or all of the steps described in a method for controlling the primary frequency regulation dead zone of a wind farm energy management platform provided in this embodiment.

[0086] This embodiment also provides a computer-readable storage medium, which stores a computer program. The computer program includes program instructions. When the program instructions are executed by a processor, the processor executes some or all of the steps described in the method for controlling the primary frequency regulation dead zone of a wind farm energy management platform provided in this embodiment.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A method for controlling the primary frequency modulation dead zone of a wind farm energy management platform, characterized in that: The method is applied to a wind power generation energy management system, and the method comprises: Based on the preset judgment logic, determine whether the current frequency modulation is a frequency modulation dead zone test; If it is a single frequency modulation dead zone test, calculate the frequency modulation target change value; Based on the frequency regulation target change value, selecting a first target unit that meets the active power interval mode; If the adjustable power of the first destination unit is greater than or equal to the frequency regulation target change value, and the preset power allocated to the first destination unit is greater than the fine adjustment threshold corresponding to the first destination unit, the wind power generation energy management system transmits power to the first destination unit; If the adjustable power of the first destination unit is less than the frequency regulation target change value, continue to select the second destination unit that meets the active power interval mode; If the sum of the adjustable powers of the first destination unit and the second destination unit is greater than or equal to the frequency regulation target change value, and the power preset allocated to the first destination unit is greater than the fine adjustment threshold corresponding to the first destination unit, and the power preset allocated to the second destination unit is greater than the fine adjustment threshold corresponding to the second destination unit, then the wind power generation energy management system delivers power to the first and second destination units; If the sum of the adjustable powers of the first destination unit and the second destination unit is greater than or equal to the frequency regulation target change value, and among the powers preset to be allocated to the first destination unit and the powers preset to be allocated to the second destination unit, there is a destination unit whose preset allocated power is less than or equal to its fine-tuning threshold, then the destination units whose preset allocated power is less than or equal to its fine-tuning threshold are eliminated, and the wind power generation energy management system sends power to the destination units whose preset allocated power is greater than its fine-tuning threshold; If the sum of the adjustable powers of the first destination unit and the second destination unit is less than the frequency regulation target change value, the wind power generation energy management system repeats the power allocation and issuance decision process for the first destination unit and the second destination unit until the sum of the adjustable powers of several destination units is equal to the frequency regulation target change value and the wind power generation energy management system has completed the power allocation and issuance decision process for several destination units, then the scheduling is ended.

2. A method for controlling the primary frequency modulation dead zone of a wind farm energy management platform according to claim 1, characterized in that: The step of determining whether the current frequency modulation is a frequency modulation dead zone test based on a preset judgment logic includes: Obtain the frequency modulation target value m of the wind turbine generator set following the frequency modulation dispatched by the power grid and the current initial power value P of the entire field start and wind farm capacity value n; The primary frequency modulation target value m, the current initial power value P of the entire field start and the wind farm capacity value n are brought into the preset judgment logic to determine whether the current frequency regulation is a frequency regulation dead zone test.

3. A method for controlling the primary frequency modulation dead zone of a wind farm energy management platform according to claim 2, characterized in that: The preset judgment logic is expressed as: Among them, the active power control mode C=1 indicates that the primary frequency modulation is normally delivered, and the active power control mode C=2 indicates that the primary frequency modulation dead zone test is performed.

4. The method for controlling the primary frequency modulation dead zone of the wind farm energy management platform according to claim 2, characterized in that: The frequency modulation target change value is calculated using the following expression: Δt=|m-P start | Among them, Δt is the frequency modulation target change value, m is the frequency modulation target value, P start This is the initial value issued to the entire venue.

5. The method for controlling the primary frequency modulation dead zone of the wind farm energy management platform according to claim 1, characterized in that: Use the following expression to calculate the adjustable power of a single destination unit: P 可调 =|P y -P max | Among them, P 可调 is the adjustable power of the target unit, P y is the active power that the target unit should generate, P max It is the maximum setting value of active power of the target unit.

6. A method for controlling the primary frequency modulation dead zone of a wind farm energy management platform according to claim 1, characterized in that: Use the following expression to calculate the fine-tuning threshold corresponding to the target unit: Among them, l is the fine-tuning threshold, P e is the rated power of the target unit.

7. A control system for the primary frequency modulation dead zone of a wind farm energy management platform, characterized in that: The system comprises: Frequency modulation judgment module: Based on the preset judgment logic, it determines whether the current frequency modulation is a frequency modulation dead zone test; Frequency modulation target calculation module: If it is a frequency modulation dead zone test, the frequency modulation target change value is calculated; A generator selection module: based on the frequency regulation target change value, selects a first target generator that meets the active power interval mode; A power delivery module: if the adjustable power of the first destination unit is greater than or equal to the frequency regulation target change value, and the power preset to be allocated to the first destination unit is greater than the fine adjustment threshold corresponding to the first destination unit, then delivering the power to the first destination unit; The unit selection module further includes: if the adjustable power of the first target unit is less than the frequency regulation target change value, continuing to select a second target unit that meets the active power interval mode; The power delivery module further includes: delivering power to the first and second destination groups if the sum of the adjustable powers of the first destination group and the second destination group is greater than or equal to the frequency regulation target change value, and the power preset allocated to the first destination group is greater than the fine adjustment threshold corresponding to the first destination group, and the power preset allocated to the second destination group is greater than the fine adjustment threshold corresponding to the second destination group; If the sum of the adjustable powers of the first destination group and the second destination group is greater than or equal to the frequency regulation target change value, and among the powers preset for the first destination group and the powers preset for the second destination group, there is a destination group whose preset allocated power is less than or equal to its fine-tuning threshold, then the destination groups whose preset allocated power is less than or equal to its fine-tuning threshold are eliminated, and power is delivered to the destination groups whose preset allocated power is greater than its fine-tuning threshold; Scheduling end judgment module: If the sum of the adjustable powers of the first destination group and the second destination group is less than the frequency regulation target change value, the power allocation and issuance decision process for the first destination group and the second destination group is repeated until the sum of the adjustable powers of several destination groups is equal to the frequency regulation target change value and the power allocation and issuance decision process for several destination groups has been completed, then the scheduling is ended.

8. A terminal, characterized in that: The method comprises a processor, an input device, an output device and a memory, wherein the processor, the input device, the output device and the memory are interconnected, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is configured to call the program instructions to execute the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, wherein the computer program includes program instructions. When the program instructions are executed by a processor, the processor is caused to perform the method according to any one of claims 1 to 6.

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