Control method for primary frequency modulation dead zone of wind power plant energy management platform

Abstract

The invention provides a control method and system for a primary frequency modulation dead zone of a wind power plant energy management platform, a terminal and a medium, and belongs to the technical field of wind power plant energy management and control. The method comprises the following steps: firstly, determining whether current frequency modulation is in a primary frequency modulation dead zone test stage through preset judgment logic, if yes, calculating a frequency modulation target change value, selecting a first target unit meeting an active interval mode based on the value, and if adjustable power of the first unit meets requirements and preset distribution power is not smaller than a fine adjustment threshold, selecting a second target unit meeting an active interval mode; and if yes, directly issuing power to the first target unit. And if the sum of the adjustable powers of the two units is not enough, selecting a second unit and carrying out power distribution and issuing according to similar conditions, and if the sum of the adjustable powers of the two units still does not meet the requirement, continuing to select more units until the sum of the powers of the multiple units is equal to the frequency modulation target change value, and completing a power distribution and issuing decision. The stability and efficiency of the wind power plant in the frequency modulation process are ensured, and the intelligent level of energy management is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind farm energy management and control, and in particular to a control method, system, terminal and medium for a primary frequency modulation dead zone of a wind farm energy management platform. Background Art

[0002] In the daily operation and maintenance of the power system, it is crucial to ensure the stability of the power grid frequency. Figure 1 As shown in the figure, the traditional primary frequency regulation strategy mainly relies on the energy management platform (EMS) to receive and process the latest frequency regulation target value, and then adjust the power of each unit. This strategy can effectively maintain the stability of the grid frequency in most cases, but in certain specific situations, especially when conducting a primary frequency regulation dead zone test, its potential problems gradually emerge.

[0003] In a frequency regulation dead zone test, since the change in frequency regulation power is relatively small, it may be lower than the coarse adjustment threshold set by the EMS platform. This means that even if the grid frequency changes and needs to be adjusted, the EMS platform may not be able to issue the corresponding dispatching instructions because the power change does not reach its response threshold. This situation will not only cause the grid frequency to be unable to be adjusted in time, but may also further affect the stability and security of the power system.

[0004] In addition, even if the EMS platform can respond to the frequency modulation instructions of such small power changes and issue adjustments to the unit power throughout the field, overshoot is often prone to occur. Overshoot means that the adjustment of the unit power exceeds the actual need, which not only wastes energy, but may also have an adverse effect on the stable operation of the unit. Especially in large-scale power systems, the stability of all units in the field is crucial to the safe operation of the entire power grid. The emergence of overshoot will undoubtedly increase the risk of unit failure, and thus pose a threat to the stability and reliability of the power grid.

[0005] Therefore, it is urgent to explore a control and adjustment method. This new control and adjustment method needs to effectively reduce the power fluctuation when the frequency regulation dead zone is triggered, while ensuring that the full-field power can accurately follow the dispatch instructions, thereby improving the stability of the unit. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention proposes a control method, system, terminal and medium for the primary frequency modulation dead zone of a wind farm energy management platform to solve the technical problems existing in the prior art.

[0007] The technical solution adopted by the present invention is:

[0008] A first aspect of the present embodiment provides a method for controlling a primary frequency modulation dead zone of an energy management platform of a wind farm, characterized in that the method is applied to a wind power generation energy management system, and the method 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 frequency modulation dead zone test, the frequency modulation target change value is calculated;

[0011] Based on the frequency modulation target change value, selecting a first target unit that meets the active 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 sends 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 sends 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 power preset to be allocated to the first destination unit and the power 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 unit whose preset allocated power is less than or equal to its fine-tuning threshold is eliminated, and the wind power generation energy management system sends power to the destination unit 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 decision-making 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 decision-making process for several destination units, then the scheduling is terminated.

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

[0018] 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;

[0019] 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.

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

[0021]

[0022] Among them, the active power control mode C=1 indicates that the primary frequency modulation is sent normally, and the active power control mode C=2 indicates the primary frequency modulation dead zone test.

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

[0024] Δt=|mP start |

[0025] Among them, Δt is the frequency modulation target change value, m is the primary frequency modulation target value, P start This is the initial value issued for the entire venue.

[0026] Furthermore, the adjustable power of a single destination unit is calculated using 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 that the target unit should generate, P max It is the maximum setting value of active power of the target unit.

[0029] Furthermore, the fine-tuning threshold corresponding to the target unit is calculated using the following expression:

[0030]

[0031] Among them, l is the fine-tuning threshold, P e The rated power of the target unit.

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

[0033] Frequency modulation judgment module: Based on the preset judgment logic, it determines whether the current frequency modulation is a frequency modulation dead zone test;

[0034] Frequency modulation target calculation module: if it is a frequency modulation dead zone test, the frequency modulation target change value is calculated;

[0035] A unit selection module: based on the frequency regulation target change value, selects a first target unit that meets the active interval mode;

[0036] Power sending module: 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, then send the power to the first destination unit;

[0037] 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;

[0038] The power delivery module further includes: 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, then delivering power to the first and second destination groups;

[0039] 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 to be allocated to the first destination group and the powers preset to be allocated to the second destination group, there is a destination group whose preset allocated power is less than or equal to its fine adjustment threshold, then the destination group whose preset allocated power is less than or equal to its fine adjustment threshold is eliminated, and power is delivered to the destination group whose preset allocated power is greater than its fine adjustment threshold;

[0040] 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 decision-making 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 decision-making process for several destination groups has been completed, then the scheduling is ended.

[0041] A third aspect of 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, and the processor is configured to call the program instructions to execute any method described in the first aspect of this embodiment.

[0042] A fourth aspect of this embodiment provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, wherein the computer program includes program instructions, and when the program instructions are executed by a processor, the processor executes the method as described in any one of the first aspects of this embodiment.

[0043] It can be seen from the above technical solution that the beneficial technical effects of the present invention are as follows:

[0044] 1. The optimized energy management platform control logic of the present invention will adaptively search for units that meet the power change when a frequency regulation dead zone state is identified to be triggered, effectively reducing the participation of the units in the dead zone frequency regulation, maximizing the possible control variables, and using the least units for power regulation, thereby improving the stability of the units in the frequency regulation state. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0046] Figure 1 It is a flow chart of the original primary frequency modulation dispatching in the prior art of the present invention;

[0047] Figure 2 This is a logic diagram of a primary frequency modulation dead zone test according to an embodiment of the present invention;

[0048] Figure 3 A schematic diagram of a system according to an embodiment of the present invention;

[0049] Figure 4 Schematic diagram of a terminal according to an embodiment of the present invention. DETAILED DESCRIPTION

[0050] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0051] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0052] Example

[0053] This embodiment provides a method for controlling the primary frequency modulation dead zone of a wind farm energy management platform, such as Figure 2 As shown, the method includes:

[0054] Based on the preset judgment logic, determine whether the current frequency modulation is a frequency modulation dead zone test. Specifically:

[0055] 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;

[0056] 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.

[0057] The preset judgment logic is expressed as:

[0058]

[0059] Among them, the active power control mode C=1 indicates that the primary frequency modulation is sent normally, and the active power control mode C=2 indicates the primary frequency modulation dead zone test.

[0060] In one embodiment, if based on the primary frequency modulation target value m and the current initial power value P for the entire field start and the wind farm capacity value n are brought into the preset judgment logic, and it is determined that the current frequency regulation is not a frequency regulation dead zone test, and the primary frequency regulation is issued normally.

[0061] In one embodiment, if based on the primary frequency modulation target value m and the current initial power value P for the entire field start and wind farm capacity value n, are brought into the preset judgment logic to determine that the current frequency regulation is a frequency regulation dead zone test; the frequency regulation target change value is calculated through the following expression:

[0062] Δt=|mP start |

[0063] Among them, Δt is the frequency modulation target change value, m is the primary frequency modulation target value, P start This is the initial value issued for the entire venue.

[0064] Based on the frequency regulation target change value, selecting a first target unit that satisfies the active interval mode = 1, that is, can generate electricity normally;

[0065] 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 sends power to the first destination unit;

[0066] If the adjustable power of the first target unit is less than the frequency regulation target change value, then continue to select the second target unit that satisfies the active interval mode = 1, that is, can generate electricity normally;

[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 sends 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 power preset to be allocated to the first destination unit and the power 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 unit whose preset allocated power is less than or equal to its fine-tuning threshold is eliminated, and the wind power generation energy management system sends power to the destination unit 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 decision-making 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 decision-making process for several destination units, then the scheduling is terminated.

[0070] Specifically, the adjustable power of a single destination 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 The rated power of the target unit.

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

[0077] Frequency modulation determination module 101: based on preset determination logic, determines whether the current frequency modulation is a frequency modulation dead zone test;

[0078] Frequency modulation target calculation module 102: if it is a frequency modulation dead zone test, then calculate the frequency modulation target change value;

[0079] The unit selection module 103: based on the frequency regulation target change value, selects a first target unit that meets the active power interval mode;

[0080] The power sending module 104 sends power to the first destination unit 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;

[0081] The unit selection module 103 further includes: if the adjustable power of the first target unit is less than the frequency regulation target change value, continue to select a second target unit that meets the active power interval mode;

[0082] The power delivery module 104 further includes: 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, then delivering power to the first and second destination groups;

[0083] 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 to be allocated to the first destination group and the powers preset to be allocated to the second destination group, there is a destination group whose preset allocated power is less than or equal to its fine adjustment threshold, then the destination group whose preset allocated power is less than or equal to its fine adjustment threshold is eliminated, and power is delivered to the destination group whose preset allocated power is greater than its fine adjustment threshold;

[0084] Scheduling end judgment module 105: 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 decision-making 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 decision-making process for several destination groups has been completed, then the scheduling is ended.

[0085] like Figure 4As shown, this embodiment provides a terminal, including 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 part or all of the steps described in a method for controlling a primary frequency regulation dead zone of an energy management platform of a wind farm 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 part or all of the steps described in a method for controlling a primary frequency modulation dead zone of an energy management platform in a wind farm 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 replace some or all of the technical features therein by equivalents. 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 specification 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 frequency modulation dead zone test, the frequency modulation target change value is calculated; Based on the frequency modulation target change value, selecting a first target unit that meets the active 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 sends 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 sends 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 power preset to be allocated to the first destination unit and the power 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 unit whose preset allocated power is less than or equal to its fine-tuning threshold is eliminated, and the wind power generation energy management system sends power to the destination unit 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 decision-making 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 decision-making process for several destination units, then the scheduling is terminated.

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 judging whether the current frequency modulation is a frequency modulation dead zone test based on the 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 sent normally, and the active power control mode C=2 indicates the primary frequency modulation dead zone test.

4. 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 frequency modulation target change value is calculated by the following expression: Δt=|m-P start | Among them, Δt is the frequency modulation target change value, m is the primary frequency modulation target value, P start This is the initial value issued for the entire venue.

5. 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 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 value of the corresponding target unit: Among them, l is the fine-tuning threshold, P e 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 unit selection module: based on the frequency regulation target change value, selects a first target unit that meets the active interval mode; Power sending module: 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, then send 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: 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, then 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 among the powers preset to be allocated to the first destination group and the powers preset to be allocated to the second destination group, there is a destination group whose preset allocated power is less than or equal to its fine adjustment threshold, then the destination group whose preset allocated power is less than or equal to its fine adjustment threshold is eliminated, and power is delivered to the destination group whose preset allocated power is greater than its fine adjustment 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 decision-making 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 decision-making 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 comprises 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, and 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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