Method and device for controlling primary frequency modulation of thermal power generating unit

Abstract

The invention discloses a control method and device for primary frequency modulation of a thermal power generating unit. The method comprises the steps that whether the current slip of the actual rotating speed and the rated rotating speed of the thermal power generating unit is within the frequency modulation dead zone range or not is judged; if yes, the preset slip is sent to a steam turbine digital electro-hydraulic control system and a coordination control system for thermal power unit control; otherwise, primary frequency modulation action is carried out, extreme value processing is carried out on the current slip to obtain target slip, and the target slip is sent to a steam turbine digital electro-hydraulic control system and a coordination control system to carry out thermal power generating unit control. According to the method, frequent actions of primary frequency modulation of the thermal power generating unit can be reduced, low-frequency oscillation is inhibited to a certain extent, some invalid actions are avoided, disturbance to the thermal power generating unit is reduced, and safe operation of the thermal power generating unit is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power generation units, and in particular to a control method and device for primary frequency modulation of a thermal power generation unit. Background Art

[0002] The primary frequency regulation capability of thermal power units is an important means to ensure the quality of power grid frequency. The effect of the primary frequency regulation of thermal power units is directly related to the stability of power grid frequency. At the same time, the frequent fluctuations of the grid frequency also bring more tests to power plants. As a key factor in supporting the stability of power grid frequency, thermal power units must support the grid while reducing tests and ensuring the safe operation of thermal power units.

[0003] With the rapid development of new energy and the increase in DC power transmission, the power structure of the power grid has changed greatly, the amplitude and frequency of power grid frequency disturbances have gradually increased, and the frequency safety risk has further increased. The existing thermal power units not only have frequent primary frequency modulation actions, but also have some invalid actions, which cause disturbances to the thermal power units and affect the safe operation of the thermal power units. Summary of the invention

[0004] In view of the problems in the prior art, an embodiment of the present invention provides a control method and device for primary frequency modulation of a thermal power unit. The present invention can reduce the frequent actions of primary frequency modulation of the thermal power unit, suppress the occurrence of low-frequency oscillations to a certain extent, and avoid some invalid actions, thereby reducing the disturbance caused to the thermal power unit and ensuring the safe operation of the thermal power unit.

[0005] An embodiment of the present invention provides a method for controlling primary frequency modulation of a thermal power unit, the method comprising:

[0006] Determine whether the current slip between the actual speed and the rated speed of the thermal power unit is within the frequency regulation dead zone;

[0007] If yes, the preset slip is sent to the digital electro-hydraulic control system of the steam turbine and the coordinated control system for thermal power unit control;

[0008] Otherwise, a frequency modulation action is performed, and the current slip is subjected to extreme value processing to obtain a target slip and is sent to the steam turbine digital electro-hydraulic control system and the coordinated control system respectively to control the thermal power unit.

[0009] In one embodiment, performing extreme value processing on the current slip to obtain a target slip specifically includes:

[0010] When the current slip is greater than the frequency modulation dead zone, performing a first logic extreme value processing on the current slip to obtain a first target slip;

[0011] When the current slip is smaller than the frequency modulation dead zone, the current slip is processed to a second logic extreme value to obtain a second target slip.

[0012] In one embodiment, performing a first logic extreme value processing on the current slip to obtain a first target slip specifically includes:

[0013] When the duration of the frequency modulation action does not exceed the effective duration, the maximum value between the current slip and the previous cycle slip is set as the first target slip.

[0014] In one embodiment, performing a second logic extreme value processing on the current slip to obtain a second target slip specifically includes:

[0015] When the duration of the frequency modulation action does not exceed the effective duration, the minimum value between the current slip and the previous cycle slip is set as the second target slip.

[0016] In one embodiment, when the duration of the frequency modulation action exceeds the effective duration, the preset slip is set as the target slip.

[0017] The embodiment of the present invention further provides a control device for primary frequency regulation of a thermal power unit, the device comprising:

[0018] A judgment module is used to judge whether the current slip between the actual speed and the rated speed of the thermal power unit is within the frequency regulation dead zone;

[0019] The control module is used for sending the preset slip to the digital electro-hydraulic control system of the steam turbine and the coordinated control system to control the thermal power unit when the current slip between the actual speed of the thermal power unit and the rated speed is within the frequency modulation dead zone; when the current slip between the actual speed of the thermal power unit and the rated speed is not within the frequency modulation dead zone, performing a frequency modulation action, and performing extreme value processing on the current slip to obtain a target slip and sending it to the digital electro-hydraulic control system of the steam turbine and the coordinated control system to control the thermal power unit.

[0020] In one embodiment, the control module includes a first control unit and a second control unit;

[0021] The first control unit is used for:

[0022] When the current slip is greater than the maximum value of the frequency modulation dead zone, the current slip is subjected to a first logic extreme value processing to obtain a first target slip;

[0023] The second control unit is used for:

[0024] When the current slip is less than the minimum value of the frequency modulation dead zone, the current slip is processed into a second logic extreme value to obtain a second target slip.

[0025] In one embodiment, the first control unit is specifically configured to:

[0026] When the duration of the frequency modulation action does not exceed the effective duration, the maximum value between the current slip and the slip in the previous cycle is set as the first target slip.

[0027] In one embodiment, the second control unit is specifically configured to:

[0028] When the duration of the frequency modulation action does not exceed the effective duration, the minimum value between the current slip and the slip in the previous cycle is set as the second target slip.

[0029] In one embodiment, it further includes: a third control unit;

[0030] The third control unit is used for:

[0031] When the duration of the one frequency modulation action exceeds the effective duration, the preset slip is set as the target slip.

[0032] An embodiment of the present invention further provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the above methods when executing the computer program.

[0033] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, any of the above methods is implemented.

[0034] An embodiment of the present invention further provides a computer program product, wherein the computer program product includes a computer program, and when the computer program is executed by a processor, any of the above methods is implemented.

[0035] The embodiment of the present invention provides a control method and device for primary frequency modulation of a thermal power unit, the method comprising: judging whether the current slip between the actual speed and the rated speed of the thermal power unit is within the frequency modulation dead zone; if so, sending the preset slip to the digital electro-hydraulic control system of the steam turbine and the coordinated control system respectively to control the thermal power unit; otherwise, performing a primary frequency modulation action, and performing extreme value processing on the current slip to obtain a target slip and sending it to the digital electro-hydraulic control system of the steam turbine and the coordinated control system respectively to control the thermal power unit. The present invention can reduce the frequent actions of the primary frequency modulation of the thermal power unit, suppress the occurrence of low-frequency oscillation to a certain extent, and avoid some invalid actions, thereby reducing the disturbance caused to the thermal power unit and ensuring the safe operation of the thermal power unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0037] Figure 1 A schematic diagram of a control scheme of an existing thermal power unit in an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of a method for selecting a primary frequency regulation slip of a thermal power unit according to an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of a control method for primary frequency modulation of a thermal power unit in an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of a control device for primary frequency regulation of a thermal power unit in an embodiment of the present invention;

[0041] Figure 5 A schematic diagram of the computer device structure provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0043] In order to facilitate understanding of the technical solution provided by this application, the research background of the technical solution of this application is briefly described below.

[0044] A thermal power unit uses coal, oil or combustible gas as fuel to heat the water in the boiler to increase its temperature, and then uses steam with a certain pressure to drive a turbine to generate electricity.

[0045] like Figure 1 FIG. 1 is a schematic diagram of a control scheme of an existing thermal power unit in an embodiment of the present invention. The difference between the actual speed (grid frequency change) and the rated speed (3000 rpm) of the thermal power unit is taken as Figure 1The slip on the DEH (steam turbine digital electro-hydraulic control system) side is calculated through the unequal rate function F2 (x) to obtain the integrated valve position increment to be acted on and added to the integrated valve position command of the unit as the first frequency modulation action amount; the slip on the CCS (coordinated control system) side is calculated through the unequal rate function F1 (x) to obtain the frequency modulation power increment to be acted on and added to the unit load command of the unit as the final load target value after the first frequency modulation action. The control of the thermal power unit is realized under the coordinated action of DEH and CCS.

[0046] However, the existing solutions have the following disadvantages:

[0047] First of all, the two rules mainly have the following assessment indicators: 15-second output response index; 30-second output response index; power contribution index. In the existing thermal power unit primary frequency regulation scheme, the slip changes in real time with the grid frequency, and the benchmark slip values ​​of each index assessed by the two rules are taken as the extreme value of the grid frequency in the effective action of the primary frequency regulation. The existing scheme fails to meet this requirement. Even if some patent schemes have a method of taking the extreme value of the slip within 2.1rpm with a small disturbance, under the situation of fully absorbing new energy, the frequency and amplitude of frequency fluctuations in the grid frequency have greatly increased, and the frequency disturbance amplitude often exceeds 2.1rpm, that is, the existing schemes are very likely to cause the qualified rate of each response index of the primary frequency regulation of thermal power units to decrease. In addition, the slip changes in real time with the grid frequency, and the unit is also adjusted in real time. As the slip rises and falls, the load of the primary frequency regulation response also rises and falls, and the disturbance will be more frequent, which increases the instability of the unit to a certain extent, and there are also grid accidents with low-frequency oscillations. There are two more details. The effective assessment time for a frequency regulation is 60 seconds. When a frequency regulation action lasts for more than 60 seconds, it is invalid but the unit will still adjust with the grid frequency. This situation should be avoided.

[0048] To solve the above problems, Figure 3 As shown, an embodiment of the present invention provides a control method for primary frequency modulation of a thermal power unit, the method comprising:

[0049] Determine whether the current slip between the actual speed and the rated speed of the thermal power unit is within the frequency regulation dead zone;

[0050] If yes, the preset slip is sent to the digital electro-hydraulic control system of the steam turbine and the coordinated control system for thermal power unit control;

[0051] Otherwise, a frequency modulation action is performed, and the current slip is subjected to extreme value processing to obtain a target slip and is sent to the steam turbine digital electro-hydraulic control system and the coordinated control system respectively to control the thermal power unit.

[0052] Specifically, the present invention pre-processes the input slip of the existing primary frequency modulation and then inputs it into the steam turbine digital electro-hydraulic control system and the coordinated control system to control the thermal power unit. The pre-processing is to first determine whether the current slip between the actual speed and the rated speed of the thermal power unit is within the frequency modulation dead zone range ([-2, +2]). When the current slip between the actual speed and the rated speed of the thermal power unit is within the frequency modulation dead zone range, the current slip is set to the preset slip (0) and sent to the steam turbine digital electro-hydraulic control system and the coordinated control system respectively to control the thermal power unit. At this time, it is an invalid action of the primary frequency modulation, that is, it can avoid the invalid action of the primary frequency modulation to a certain extent and reduce the frequent action of the primary frequency modulation; when the current slip between the actual speed and the rated speed of the thermal power unit is not within the frequency modulation dead zone range, it is necessary to perform an effective action of the primary frequency modulation, and the current slip is subjected to extreme value processing to obtain the target slip and sent to the steam turbine digital electro-hydraulic control system and the coordinated control system respectively to control the thermal power unit. The extreme value processing of the current slip can meet the selection of the network frequency extreme value during the effective action of the primary frequency modulation. That is, when a frequency modulation is effective, the response of the thermal power unit is only adjusted according to the extreme value. When the grid frequency changes below the extreme value, the thermal power unit will no longer adjust with the grid frequency change. That is, when the grid frequency amplitude decreases, as long as it is in effective action, the unit will not follow the callback response. In this way, the thermal power unit has only one-way action and no oscillation response, ensuring the stable operation of the unit until the frequency modulation action is completed.

[0053] In one embodiment, performing extreme value processing on the current slip to obtain a target slip specifically includes:

[0054] When the current slip is greater than the frequency modulation dead zone, performing a first logic extreme value processing on the current slip to obtain a first target slip;

[0055] When the current slip is smaller than the frequency modulation dead zone, the current slip is processed to a second logic extreme value to obtain a second target slip.

[0056] Specifically, when the current slip is greater than the maximum value of the frequency modulation dead zone (for example, 2 revolutions), the current slip is subjected to a first logical extreme value processing (a method for selecting a positive extreme value) to obtain a first target slip; when the current slip is less than the minimum value of the frequency modulation dead zone (for example, -2 revolutions), the current slip is subjected to a second logical extreme value processing (a method for selecting a negative extreme value) to obtain a second target slip.

[0057] In one embodiment, performing a first logic extreme value processing on the current slip to obtain a first target slip specifically includes:

[0058] When the duration of the frequency modulation action does not exceed the effective duration, the maximum value between the current slip and the previous cycle slip is set as the first target slip.

[0059] In one embodiment, performing a second logic extreme value processing on the current slip to obtain a second target slip specifically includes:

[0060] When the duration of the frequency modulation action does not exceed the effective duration, the minimum value between the current slip and the previous cycle slip is set as the second target slip.

[0061] Specifically, Figure 2 The figure shows a schematic diagram of a method for selecting a slip of a thermal power unit in a primary frequency regulation according to an embodiment of the present invention, which includes steps 1 and 2. Step 1 is specifically described as follows: The method for selecting a positive extreme value is based on the real-time slip and Figure 2 The slip after processing takes the maximum value, marked as Figure 2 Y value in step 1; the negative extreme value is selected by real-time slip and Figure 2 The slip after processing takes the minimum value, marked as Figure 2 N value in link 1; when the real-time slip is higher than 2rpm (frequency modulation dead zone), link 1 sends Y value; otherwise link 1 sends N value.

[0062] In one embodiment, when the duration of the frequency modulation action exceeds the effective duration, the preset slip is set as the target slip.

[0063] Specifically, when a frequency regulation action lasts longer than the effective duration (i.e. the preset assessment duration of the unit, for example, 60 seconds), the frequency regulation action will be automatically exited. Because actions exceeding the effective duration are invalid actions, the unit does not need to continue to follow the fluctuation of the grid frequency, which can avoid invalid frequency regulation and make the unit run safer and more stable.

[0064] like Figure 2 As shown in the figure, the function of part 2 is to exit the frequency modulation function when the frequency modulation action exceeds the effective assessment time ( Figure 2 Specific description of link 2: if the frequency modulation is activated once and lasts for 60 seconds (effective assessment time of frequency modulation once), the output is the output value of link 1; if the frequency modulation is activated once and lasts for more than 60 seconds, the slip output is 0, that is, the frequency modulation function is exited; if the frequency modulation is not activated once, the slip output is 0.

[0065] The present invention obtains the current slip between the actual speed and the rated speed of the thermal power unit at fixed intervals and performs the above-mentioned preprocessing operation on it. Figure 2In the middle link 1, 2 turns are used to define the direction of extreme value selection, that is, the maximum value of the real-time slip sent by 2 turns and the slip finally output by link 2 in the previous cycle, and the minimum value of the real-time slip sent by 2 turns and the slip finally output by link 2 in the previous cycle. When the real-time slip is between -2 turns and 2 turns, the final output of link 2 is 0; when the real-time slip exceeds [-2, +2] turns and lasts for more than 60 seconds, the final output of link 2 is 0; when the real-time slip exceeds [-2, +2] turns and lasts for less than 60 seconds, it is an effective frequency modulation action, and the output is the value sent by link 1.

[0066] The specific examples are as follows:

[0067] When the real-time slip is within [-2, +2] revolutions, no frequency modulation is required, and the output of link 2 is 0 at this time; if the real-time slip is 1.5 revolutions, the logic of link 1 is lower than 2 revolutions, and the output is 1.5 revolutions and the initial output value of link 2, whichever is smaller, that is, 0 revolutions are sent; if the real-time speed is -1.5 revolutions, the logic of link 1 is lower than 2 revolutions, and the output is -1.5 revolutions and the initial output value of link 2, whichever is smaller, that is, -1.5 revolutions are sent.

[0068] When the real-time slip exceeds 2 revolutions, a frequency modulation action is performed. At this time, the output of link 2 is the value sent by link 1 (0 if it exceeds 60 seconds). If the real-time speed is 3 revolutions, the logic of link 1 is higher than 2 revolutions, and the output is 3 revolutions and the link 2 output value 0 (the output of the previous cycle is defined as 0) takes the maximum value of 3 revolutions as the output value of link 2 in the current cycle; when the real-time slip in the next cycle is 2.5 revolutions, the link 1 output is 2.5 revolutions and the link 2 output value 3 revolutions takes the maximum value and sends out 3 revolutions (taking the extreme value effect); when the real-time slip in the next cycle is 3.5 revolutions, the link 1 output is 3.5 revolutions and the link 2 output value 3 revolutions takes the maximum value and sends out 3.5 revolutions.

[0069] When the real-time slip exceeds -2 revolutions, a frequency modulation action is performed. At this time, the output of link 2 is the value sent by link 1 (0 if it exceeds 60 seconds). If the real-time speed is -3 revolutions, the logic of link 1 is lower than 2 revolutions, and the output is -3 revolutions and the link 2 output value 0 (the previous cycle is defined as 0) takes the minimum value of -3 revolutions as the output value of link 2 in the current cycle; when the real-time slip in the next cycle is -2.5 revolutions, the link 1 output is -2.5 revolutions and the link 2 output value -3 revolutions, and then -3 revolutions are sent after taking the minimum value (taking the extreme value effect); when the real-time slip in the next cycle is -3.5 revolutions, the link 1 output is -3.5 revolutions and the link 2 output value -3 revolutions take the minimum value and then -3.5 revolutions are sent.

[0070] The present invention allows the slip to change unidirectionally and always takes the extreme value as the effective action value until the primary frequency modulation action is completed, thereby greatly reducing the frequent disturbance of the primary frequency modulation of the unit and suppressing the occurrence of low-frequency oscillation to a certain extent; when the effective action of the primary frequency modulation exceeds the assessment time (that is, the effective duration, such as 60 seconds), the primary frequency modulation is exited to avoid invalid response actions of the unit, reduce the disturbance risk of the unit, and ensure the safe operation of the unit; the slip is selected to be consistent with the assessment slip, thereby improving the primary frequency regulation assessment index of the unit.

[0071] The present invention also provides a control device for primary frequency regulation of a thermal power unit, as described in the following embodiments. Since the principle of the device to solve the problem is similar to that of the above method, the implementation of the device can refer to the implementation of the above method, and the repeated parts will not be repeated.

[0072] like Figure 4 As shown, an embodiment of the present invention further provides a control device for primary frequency regulation of a thermal power unit, the device comprising:

[0073] A judgment module is used to judge whether the current slip between the actual speed and the rated speed of the thermal power unit is within the frequency regulation dead zone;

[0074] The control module is used for sending the preset slip to the digital electro-hydraulic control system of the steam turbine and the coordinated control system to control the thermal power unit when the current slip between the actual speed of the thermal power unit and the rated speed is within the frequency modulation dead zone; when the current slip between the actual speed of the thermal power unit and the rated speed is not within the frequency modulation dead zone, performing a frequency modulation action, and performing extreme value processing on the current slip to obtain a target slip and sending it to the digital electro-hydraulic control system of the steam turbine and the coordinated control system to control the thermal power unit.

[0075] In one embodiment, the control module includes a first control unit and a second control unit;

[0076] The first control unit is used for:

[0077] When the current slip is greater than the maximum value of the frequency modulation dead zone, the current slip is subjected to a first logic extreme value processing to obtain a first target slip;

[0078] The second control unit is used for:

[0079] When the current slip is less than the minimum value of the frequency modulation dead zone, the current slip is processed into a second logic extreme value to obtain a second target slip.

[0080] In one embodiment, the first control unit is specifically configured to:

[0081] When the duration of the frequency modulation action does not exceed the effective duration, the maximum value between the current slip and the slip in the previous cycle is set as the first target slip.

[0082] In one embodiment, the second control unit is specifically configured to:

[0083] When the duration of the frequency modulation action does not exceed the effective duration, the minimum value between the current slip and the slip in the previous cycle is set as the second target slip.

[0084] In one embodiment, it further includes: a third control unit;

[0085] The third control unit is used for:

[0086] When the duration of the one frequency modulation action exceeds the effective duration, the preset slip is set as the target slip.

[0087] The present invention allows the slip to change unidirectionally and always takes the extreme value as the effective action value until the primary frequency modulation action is completed, thereby greatly reducing the frequent disturbance of the primary frequency modulation of the unit and suppressing the occurrence of low-frequency oscillation to a certain extent; when the effective action of the primary frequency modulation exceeds the assessment time (for example, 60 seconds), the primary frequency modulation is exited to avoid invalid response action of the unit, reduce the disturbance risk of the unit, and ensure the safe operation of the unit; the slip is selected to be consistent with the assessment slip, thereby improving the assessment index of the primary frequency regulation of the unit.

[0088] The embodiment of the present invention also provides a computer device, such as Figure 5 The figure is a structural block diagram of a computer device provided by an embodiment of the present invention, including a memory, a processor, and a computer program stored in the memory and running on the processor, and the processor implements any of the above methods when executing the computer program.

[0089] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements any of the above methods when executed by a processor.

[0090] An embodiment of the present invention further provides a computer program product, wherein the computer program product includes a computer program, and when the computer program is executed by a processor, any of the above methods is implemented.

[0091] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0092] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks 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 produce 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.

[0093] 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.

[0094] 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.

[0095] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A control method for primary frequency modulation of a thermal power unit, characterized in that: include: Determine whether the current slip between the actual speed and the rated speed of the thermal power unit is within the frequency regulation dead zone; If yes, the preset slip is sent to the digital electro-hydraulic control system of the steam turbine and the coordinated control system for thermal power unit control; Otherwise, a frequency modulation action is performed, and the current slip is subjected to extreme value processing to obtain a target slip and is sent to the steam turbine digital electro-hydraulic control system and the coordinated control system respectively to control the thermal power unit.

2. The method according to claim 1, characterized in that: The step of performing extreme value processing on the current slip to obtain a target slip specifically includes: When the current slip is greater than the frequency modulation dead zone, performing a first logic extreme value processing on the current slip to obtain a first target slip; When the current slip is smaller than the frequency modulation dead zone, the current slip is processed to a second logic extreme value to obtain a second target slip.

3. The method according to claim 2, characterized in that: The step of performing first logic extreme value processing on the current slip to obtain a first target slip specifically includes: When the duration of the frequency modulation action does not exceed the effective duration, the maximum value between the current slip and the previous cycle slip is set as the first target slip.

4. The method according to claim 2, characterized in that: The step of performing a second logic extreme value processing on the current slip to obtain a second target slip specifically includes: When the duration of the frequency modulation action does not exceed the effective duration, the minimum value between the current slip and the previous cycle slip is set as the second target slip.

5. The method according to claim 3 or 4, characterized in that: When the duration of the one frequency modulation action exceeds the effective duration, the preset slip is set as the target slip.

6. A control device for primary frequency modulation of a thermal power unit, characterized in that: include: A judgment module is used to judge whether the current slip between the actual speed and the rated speed of the thermal power unit is within the frequency regulation dead zone; The control module is used for sending the preset slip to the digital electro-hydraulic control system of the steam turbine and the coordinated control system to control the thermal power unit when the current slip between the actual speed of the thermal power unit and the rated speed is within the frequency modulation dead zone; when the current slip between the actual speed of the thermal power unit and the rated speed is not within the frequency modulation dead zone, performing a frequency modulation action, and performing extreme value processing on the current slip to obtain a target slip and sending it to the digital electro-hydraulic control system of the steam turbine and the coordinated control system to control the thermal power unit.

7. The device according to claim 6, characterized in that The control module includes a first control unit and a second control unit; The first control unit is used for: When the current slip is greater than the maximum value of the frequency modulation dead zone, the current slip is subjected to a first logic extreme value processing to obtain a first target slip; The second control unit is used for: When the current slip is less than the minimum value of the frequency modulation dead zone, the current slip is processed into a second logic extreme value to obtain a second target slip.

8. The device according to claim 7, characterized in that The first control unit is specifically used for: When the duration of the frequency modulation action does not exceed the effective duration, the maximum value between the current slip and the slip in the previous cycle is set as the first target slip.

9. The device according to claim 7, characterized in that: The second control unit is specifically used for: When the duration of the frequency modulation action does not exceed the effective duration, the minimum value between the current slip and the slip in the previous cycle is set as the second target slip.

10. The device according to claim 8 or 9, characterized in that: Also includes: A third control unit; The third control unit is used for: When the duration of the one frequency modulation action exceeds the effective duration, the preset slip is set as the target slip.

11. 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 according to any one of claims 1 to 5 is implemented.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

13. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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