Thermal power generating unit primary frequency modulation method and device based on signal decomposition

Abstract

The invention provides a thermal power generating unit primary frequency modulation method and device based on signal decomposition, and the method comprises the steps: carrying out the dead-zone processing of a slip, obtaining a slip signal, and obtaining a decomposition signal through the empirical wavelet transformation according to the slip signal; according to the decomposition signal, a primary frequency modulation power variation set value and a primary frequency modulation feed-forward compensation amount are calculated through an unequal rate function and a feed-forward function by using the power change data; according to the primary frequency modulation power variable quantity set value and the primary frequency modulation feed-forward compensation quantity, judging the primary frequency modulation action duration; and performing the primary frequency modulation action according to a comparison result of the primary frequency modulation action duration time and a preset time threshold value.

Description

Technical Field

[0001] The present application relates to the field of power grid management, and in particular to a method and device for primary frequency regulation of a thermal power unit based on signal decomposition. Background Art

[0002] With the rapid development of new energy and the increase in DC power transmission, the power supply structure of the power grid has undergone great changes. The amplitude and frequency of power grid frequency disturbances have gradually increased, and the frequency safety risk has further increased. The primary frequency regulation capability of the unit is an important means to ensure the quality of the power grid frequency. The effect of the primary frequency regulation of the unit is directly related to the stability of the power grid frequency. At the same time, the frequent fluctuations in the grid frequency also bring more assessments to the power plant. As a key factor in supporting the stability of the power grid frequency, the unit must not only support the power grid but also reduce assessments and ensure the safe operation of the unit. Therefore, it is necessary to formulate a primary frequency regulation implementation method that can reduce the frequent primary frequency regulation of the unit and avoid some invalid actions, thereby reducing the disturbance caused to the unit, ensuring the safe operation of the unit, and at the same time improving the primary frequency regulation assessment performance of the unit.

[0003] The existing primary frequency regulation logic scheme. The DEH side slip difference (grid frequency change) is calculated through the unequal rate function F2(x) to obtain the corresponding integrated valve position increment and superimposed on the unit integrated valve position instruction; the CCS side slip difference is calculated through the unequal rate function F1(x) to obtain the corresponding frequency regulation power increment and superimposed on the unit load instruction as the final load target value after the primary frequency regulation action. The primary frequency regulation function is realized under the coordination.

[0004] 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. The existing primary frequency modulation scheme uses closed-loop PID control as the control strategy. For slow frequency signal changes, that is, when the speed change frequency is low, it can achieve better control effects. However, when the speed change frequency is high, the control result will not respond in time, and the control effect is often not ideal. Therefore, it is necessary to process the data of the unit speed so that the control can adapt to the high-frequency changes in speed. In addition, the effective assessment time of the primary frequency modulation of the two rules is 60 seconds. When the primary frequency modulation action lasts for more than 60 seconds, the unit will still adjust with the grid frequency. At this time, it is an invalid action and should be avoided. Summary of the invention

[0005] The purpose of the present application is to provide a method and device for primary frequency regulation of a thermal power unit based on signal decomposition, so as to solve the problem that when the unit frequency exceeds the frequency regulation dead zone, the speed fluctuation frequency is large and the control effect is poor; at the same time, when the effective action of the primary frequency regulation lasts for more than 60 seconds, the primary frequency regulation action is automatically exited to avoid invalid primary frequency regulation.

[0006] To achieve the above-mentioned purpose, the primary frequency regulation method of a thermal power unit based on signal decomposition provided in the present application specifically includes: performing dead-zone processing on the slip to obtain a slip signal, and obtaining a decomposed signal through empirical wavelet transform according to the slip signal; according to the decomposed signal, using the power change data to calculate the primary frequency regulation power change amount setting value and the primary frequency regulation feedforward compensation amount through the unequal rate function and the feedforward function respectively; judging the duration of the primary frequency regulation action according to the primary frequency regulation power change amount setting value and the primary frequency regulation feedforward compensation amount; and performing a primary frequency regulation action by comparing the duration of the primary frequency regulation action with a preset time threshold.

[0007] In the above-mentioned primary frequency modulation method of a thermal power unit based on signal decomposition, optionally, obtaining a decomposed signal through empirical wavelet transform according to the slip signal includes: obtaining a low-frequency signal and a medium-high frequency signal through empirical wavelet transform according to the slip signal.

[0008] In the above-mentioned primary frequency regulation method of a thermal power unit based on signal decomposition, optionally, according to the decomposed signal, using the power change data to calculate the primary frequency modulation power change setting value and the primary frequency modulation feedforward compensation through the unequal rate function and the feedforward function respectively, including: analyzing the low-frequency signal and the medium and high-frequency signal through the unequal rate function to obtain the corresponding first power change, and obtaining the second power change corresponding to the differential change according to the differential amount and the gain coefficient of the medium and high-frequency signal; and obtaining the primary frequency modulation power change setting value through amplitude limitation processing according to the first power change and the second power change.

[0009] In the above-mentioned primary frequency regulation method of a thermal power unit based on signal decomposition, optionally, according to the decomposed signal, using the power change data to calculate the primary frequency regulation power change setting value and the primary frequency regulation feedforward compensation through an unequal rate function and a feedforward function respectively, including: analyzing the low-frequency signal and the medium and high frequency signals through a feedforward function to obtain the corresponding first feedforward compensation, and obtaining the second feedforward compensation corresponding to the differential change according to the differential amount and gain coefficient of the medium and high frequency signals; and obtaining the primary frequency regulation feedforward compensation through amplitude limitation processing based on the first feedforward compensation and the second feedforward compensation.

[0010] In the above-mentioned primary frequency regulation method of a thermal power unit based on signal decomposition, optionally, the slip output is reset to zero through a comparison result of the duration of the primary frequency regulation action and a preset time threshold, including: when the duration of the primary frequency regulation action is greater than or equal to the preset time threshold, the primary frequency regulation power change setting value and the primary frequency regulation feedforward compensation amount are reset to zero and the primary frequency regulation action is exited.

[0011] In the above-mentioned primary frequency regulation method of a thermal power unit based on signal decomposition, optionally, the slip output is reset to zero by comparing the duration of the primary frequency regulation action with a preset time threshold, including: when the duration of the primary frequency regulation action is less than the preset time threshold, performing primary frequency regulation control according to the primary frequency regulation power change setting value.

[0012] In the above-mentioned primary frequency regulation method of a thermal power unit based on signal decomposition, optionally, performing primary frequency regulation control according to a primary frequency regulation power change setting value also includes: collecting the duration of a primary frequency regulation action during the primary frequency regulation control process; when the duration of the primary frequency regulation action is greater than or equal to a preset time threshold, setting the primary frequency regulation power change setting value and the primary frequency regulation feedforward compensation amount to zero and exiting the primary frequency regulation action.

[0013] The present application also provides a primary frequency regulation device of a thermal power unit based on signal decomposition, the device comprising a decomposition module, a calculation module, an analysis module and a control module; the decomposition module is used to perform dead zone processing on the slip to obtain a slip signal, and obtain a decomposition signal through empirical wavelet transform according to the slip signal; the calculation module is used to calculate a primary frequency regulation power change amount setting value and a primary frequency regulation feedforward compensation amount through an unequal rate function and a feedforward function according to the decomposition signal using the power change data; the analysis module is used to determine the duration of the primary frequency regulation action according to the primary frequency regulation power change amount setting value and the primary frequency regulation feedforward compensation amount; the control module is used to perform a primary frequency regulation action through a comparison result of the primary frequency regulation action duration and a preset time threshold.

[0014] In the above-mentioned primary frequency regulation device of a thermal power unit based on signal decomposition, optionally, the decomposition module is used to obtain a low-frequency signal and a medium-high frequency signal through empirical wavelet transform according to the slip signal.

[0015] In the above-mentioned primary frequency regulation device of a thermal power unit based on signal decomposition, optionally, the calculation module includes a power calculation unit, which is used to analyze the low-frequency signal and the medium and high-frequency signal through an unequal rate function to obtain a corresponding first power change, and obtain a second power change corresponding to the differential change according to the differential amount and gain coefficient of the medium and high-frequency signal; and obtain a primary frequency regulation power change set value through amplitude limitation processing based on the first power change and the second power change.

[0016] In the above-mentioned primary frequency regulation device of a thermal power unit based on signal decomposition, optionally, the calculation module includes a compensation calculation unit, which is used to analyze the low-frequency signal and the medium and high frequency signal through a feedforward function to obtain a corresponding first feedforward compensation amount, and obtain a second feedforward compensation amount corresponding to the differential change according to the differential amount and gain coefficient of the medium and high frequency signal; and obtain a primary frequency modulation feedforward compensation amount through amplitude limitation processing based on the first feedforward compensation amount and the second feedforward compensation amount.

[0017] In the above-mentioned primary frequency regulation device of a thermal power unit based on signal decomposition, optionally, the control module includes: when the duration of the primary frequency regulation action is greater than or equal to a preset time threshold, the primary frequency regulation power change setting value and the primary frequency regulation feedforward compensation amount are reset to zero and the primary frequency regulation action is exited; when the duration of the primary frequency regulation action is less than the preset time threshold, a primary frequency regulation control is performed according to the primary frequency regulation power change setting value and the duration of the primary frequency regulation action during the primary frequency regulation control process is collected.

[0018] The present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above method when executing the computer program.

[0019] The present application also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for executing the above method.

[0020] The present application also provides a computer program product, comprising a computer program / instruction, which implements the steps of the above method when executed by a processor.

[0021] The beneficial technical effect of the present application is that it ensures the rapidity and accuracy of the primary frequency regulation action, avoids invalid primary frequency regulation action, can improve the performance indicators of the two detailed assessments of the primary frequency regulation, ensures the stability of the unit and supports the stability of the grid frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application, constitute a part of the present application, and do not constitute a limitation of the present application. In the drawings:

[0023] Figure 1A A schematic flow chart of a method for primary frequency modulation of a thermal power unit based on signal decomposition provided in one embodiment of the present application;

[0024] Figure 1B A schematic diagram of an application flow of a method for primary frequency regulation of a thermal power unit based on signal decomposition provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of a process for obtaining a set value of a primary frequency modulation power variation amount provided in an embodiment of the present application;

[0026] Figure 3 A schematic diagram of a process for obtaining a primary frequency modulation feedforward compensation amount provided in an embodiment of the present application;

[0027] Figure 4A schematic diagram of the structure of a primary frequency modulation device of a thermal power unit based on signal decomposition provided in one embodiment of the present application;

[0028] Figure 5 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0029] The following will describe the implementation methods of the present application in detail in conjunction with the accompanying drawings and embodiments, so that the implementation process of how the present application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that as long as there is no conflict, the various embodiments in the present application and the various features in the embodiments can be combined with each other, and the technical solutions formed are all within the protection scope of the present application.

[0030] In addition, the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be performed in an order different from that shown here.

[0031] Please refer to Figure 1A As shown, the primary frequency modulation method of a thermal power unit based on signal decomposition provided in this application specifically includes:

[0032] S101 performs dead zone processing on the slip to obtain a slip signal, and obtains a decomposed signal through empirical wavelet transform according to the slip signal;

[0033] S102 calculates the primary frequency modulation power variation setting value and the primary frequency modulation feedforward compensation value respectively through the unequal rate function and the feedforward function according to the decomposed signal and the power change data;

[0034] S103 determines the duration of the primary frequency modulation action according to the primary frequency modulation power variation setting value and the primary frequency modulation feedforward compensation amount;

[0035] S104 performs a frequency modulation action by comparing the duration of the frequency modulation action with a preset time threshold.

[0036] Specifically, in actual work, the dead zone processing of the slip to obtain the slip signal is usually set to the difference from the rated speed of plus or minus 2r / min, that is, when the speed difference is within the range of plus or minus 2r / min, the slip is 0, and when the slip exceeds plus or minus 2r / min, the absolute value of the slip is reduced by 2, and the positive and negative values ​​of the slip remain unchanged. Among them, obtaining a decomposed signal through empirical wavelet transform according to the slip signal includes: obtaining a low-frequency signal and a medium-high frequency signal through empirical wavelet transform according to the slip signal. In this way, the slip signal is subjected to empirical wavelet transform, and a frequency modulation control is performed according to the decomposed data. The overall process sequence can be referred to. Figure 1BAs shown, for Figure 1B The specific implementation logic of each step will be described one by one in the subsequent embodiments and will not be described in detail here.

[0037] Please refer to Figure 2 As shown, in one embodiment of the present application, according to the decomposed signal, using the power change data, respectively, through the unequal rate function and the feedforward function, the primary frequency modulation power change amount setting value and the primary frequency modulation feedforward compensation amount are calculated, which includes:

[0038] S201 analyzes the low frequency signal and the medium and high frequency signal by using an unequal rate function to obtain a corresponding first power change, and obtains a second power change corresponding to the differential change according to the differential amount of the medium and high frequency signal and a gain coefficient;

[0039] S202 obtains a primary frequency modulation power variation setting value through amplitude limitation processing according to the first power variation and the second power variation.

[0040] Please refer to Figure 3 As shown, in one embodiment of the present application, according to the decomposed signal, using the power change data, respectively, through the unequal rate function and the feedforward function, the primary frequency modulation power change amount setting value and the primary frequency modulation feedforward compensation amount are calculated, which includes:

[0041] S301 analyzes the low-frequency signal and the medium-high frequency signal through a feedforward function to obtain a corresponding first feedforward compensation amount, and obtains a second feedforward compensation amount corresponding to the differential change according to the differential amount of the medium-high frequency signal and the gain coefficient;

[0042] S302 obtains a primary frequency modulation feedforward compensation amount through amplitude limitation processing according to the first feedforward compensation amount and the second feedforward compensation amount.

[0043] For details, please refer to Figure 1B As shown, in actual work, the slip signal after the dead zone processing can be subjected to empirical wavelet transform, and the low-frequency signal and the medium-high frequency signal are obtained after the transform, and then the differential of the medium-high frequency signal is calculated; then, the low-frequency signal and the medium-high frequency signal are calculated according to the unequal rate function to obtain the corresponding power change, the differential of the medium-high frequency signal is multiplied by the gain coefficient k1 to obtain the power change corresponding to the differential change, the power change obtained by the above calculation is added and the amplitude is limited to obtain the final primary frequency modulation power change setting value; and, the low-frequency signal and the medium-high frequency signal are calculated according to the feedforward function to obtain the corresponding feedforward compensation, the differential of the medium-high frequency signal is multiplied by the gain coefficient k2 to obtain the feedforward compensation corresponding to the differential change, the feedforward compensation obtained by the above calculation is added and the amplitude is limited to obtain the final primary frequency modulation feedforward compensation.

[0044] In one embodiment of the present application, the slip output is reset to zero by comparing the duration of a frequency modulation action with a preset time threshold, including: when the duration of the frequency modulation action is greater than or equal to the preset time threshold, the power variation setting value of the frequency modulation action and the feedforward compensation value of the frequency modulation action are reset to zero and the frequency modulation action is exited. In another embodiment, the slip output is reset to zero by comparing the duration of a frequency modulation action with a preset time threshold, including: when the duration of the frequency modulation action is less than the preset time threshold, a frequency modulation control is performed according to the power variation setting value of the frequency modulation action; further, the frequency modulation control is performed according to the power variation setting value of the frequency modulation action, including: collecting the duration of the frequency modulation action during the frequency modulation control process; when the duration of the frequency modulation action is greater than or equal to the preset time threshold, the power variation setting value of the frequency modulation action and the feedforward compensation value of the frequency modulation action are reset to zero and the frequency modulation action is exited.

[0045] Specifically, in actual work, it can be determined whether the duration of this frequency modulation action reaches 60 seconds: if it does not reach 60 seconds, follow the above Figure 1B The frequency modulation method in is used for primary frequency modulation control (the slip signal after dead zone processing is subjected to empirical wavelet transform, and low-frequency signal and medium-high frequency signal are obtained after transformation, and then the differential of the medium-high frequency signal is calculated; then, the low-frequency signal and the medium-high frequency signal are calculated according to the unequal rate function to obtain the corresponding power change, and the differential of the medium-high frequency signal is multiplied by the gain coefficient k1 to obtain the power change corresponding to the differential change, and the power change obtained by the above calculation is added and amplitude limiting processing is performed to obtain the final primary frequency modulation power change setting value). If it reaches 60 seconds, the primary frequency modulation power setting value and the feedforward amount are set to 0.

[0046] Please refer to Figure 4 As shown, the present application also provides a primary frequency regulation device of a thermal power unit based on signal decomposition, the device comprising a decomposition module, a calculation module, an analysis module and a control module; the decomposition module is used to perform dead zone processing on the slip to obtain a slip signal, and obtain a decomposition signal through empirical wavelet transform according to the slip signal; the calculation module is used to calculate a primary frequency regulation power change amount setting value and a primary frequency regulation feedforward compensation amount through an unequal rate function and a feedforward function according to the decomposition signal using the power change data; the analysis module is used to determine the duration of the primary frequency regulation action according to the primary frequency regulation power change amount setting value and the primary frequency regulation feedforward compensation amount; the control module is used to perform a primary frequency regulation action through a comparison result between the duration of the primary frequency regulation action and a preset time threshold.

[0047] In the above embodiment, the decomposition module is used to obtain a low-frequency signal and a medium-high frequency signal through an empirical wavelet transform according to the slip signal. The calculation module includes a power calculation unit and a compensation calculation unit. The power calculation unit is used to analyze the low-frequency signal and the medium-high frequency signal through an unequal rate function to obtain a corresponding first power change, and obtain a second power change corresponding to the differential change according to the differential amount and gain coefficient of the medium-high frequency signal; obtain a primary frequency modulation power change setting value through amplitude limitation processing according to the first power change and the second power change. The compensation calculation unit is used to analyze the low-frequency signal and the medium-high frequency signal through a feedforward function to obtain a corresponding first feedforward compensation, and obtain a second feedforward compensation corresponding to the differential change according to the differential amount and gain coefficient of the medium-high frequency signal; obtain a primary frequency modulation feedforward compensation through amplitude limitation processing according to the first feedforward compensation and the second feedforward compensation.

[0048] In another embodiment of the present application, the control module includes: when the duration of the primary frequency modulation action is greater than or equal to a preset time threshold, the primary frequency modulation power change setting value and the primary frequency modulation feedforward compensation amount are reset to zero and the primary frequency modulation action is exited; when the duration of the primary frequency modulation action is less than the preset time threshold, a primary frequency modulation control is performed according to the primary frequency modulation power change setting value and the duration of the primary frequency modulation action during the primary frequency modulation control process is collected.

[0049] Since the principle of solving the problem by the device is similar to that of the primary frequency modulation method of a thermal power unit based on signal decomposition, the implementation of the device can refer to the implementation of the primary frequency modulation method of a thermal power unit based on signal decomposition, and the repeated parts will not be repeated.

[0050] The beneficial technical effect of the present application is that it ensures the rapidity and accuracy of the primary frequency regulation action, avoids invalid primary frequency regulation action, can improve the performance indicators of the two detailed assessments of the primary frequency regulation, ensures the stability of the unit and supports the stability of the grid frequency.

[0051] The present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above method when executing the computer program.

[0052] The present application also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for executing the above method.

[0053] The present application also provides a computer program product, comprising a computer program / instruction, which implements the steps of the above method when executed by a processor.

[0054] like Figure 5As shown, the electronic device 600 may further include: a communication module 110, an input unit 120, an audio processor 130, a display 160, and a power supply 170. It is worth noting that the electronic device 600 does not necessarily have to include Figure 5 In addition, the electronic device 600 may also include Figure 5 For components not shown, reference may be made to the prior art.

[0055] like Figure 5 As shown, the central processor 100 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor devices and / or logic devices. The central processor 100 receives inputs and controls the operations of various components of the electronic device 600.

[0056] The memory 140 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices. The above-mentioned information related to the failure may be stored, and a program for executing the relevant information may also be stored. The CPU 100 may execute the program stored in the memory 140 to implement information storage or processing.

[0057] The input unit 120 provides input to the CPU 100. The input unit 120 is, for example, a key or a touch input device. The power supply 170 is used to provide power to the electronic device 600. The display 160 is used to display display objects such as images and text. The display may be, for example, an LCD display, but is not limited thereto.

[0058] The memory 140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), a SIM card, etc. It may also be a memory that saves information even when the power is off, can be selectively erased, and is provided with more data, examples of which are sometimes referred to as EPROMs, etc. The memory 140 may also be some other type of device. The memory 140 includes a buffer memory 141 (sometimes referred to as a buffer). The memory 140 may include an application / function storage unit 142, which is used to store application programs and function programs or processes for executing the operation of the electronic device 600 through the central processor 100.

[0059] The memory 140 may also include a data storage unit (data 143) for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit (driver 144) of the memory 140 may include various drivers for communication functions of the electronic device and / or for executing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0060] The communication module 110 is a transmitter / receiver 110 that transmits and receives signals via an antenna 111. The communication module (transmitter / receiver) 110 is coupled to the central processor 100 to provide input signals and receive output signals, which may be the same as the case of a conventional mobile communication terminal.

[0061] Based on different communication technologies, multiple communication modules 110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module and / or a wireless LAN module. The communication module (transmitter / receiver) 110 is also coupled to a speaker 131 and a microphone 132 via an audio processor 130 to provide an audio output via the speaker 131 and receive an audio input from the microphone 132, thereby realizing a common telecommunication function. The audio processor 130 may include any suitable buffer, decoder, amplifier, etc. In addition, the audio processor 130 is also coupled to the central processor 100, so that the sound can be recorded on the local machine through the microphone 132, and the sound stored on the local machine can be played through the speaker 131.

[0062] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0063] The present application is described with reference to the flowchart and / or block diagram of the method, device (system) and computer program product according to the embodiment of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, and the combination of the process and / or box in the flowchart and / or block diagram can be realized 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 produce a device for realizing the function specified in one process or multiple processes in the flowchart and / or one box or multiple boxes in the block diagram.

[0064] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0065] These computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0066] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A primary frequency modulation method for a thermal power unit based on signal decomposition, characterized in that: The method comprises: Performing dead zone processing on the slip to obtain a slip signal, and obtaining a decomposed signal through empirical wavelet transform according to the slip signal; According to the decomposed signal, the power change data is used to calculate the primary frequency modulation power change amount setting value and the primary frequency modulation feedforward compensation amount through the unequal rate function and the feedforward function respectively; Determine the duration of the primary frequency modulation action according to the primary frequency modulation power variation setting value and the primary frequency modulation feedforward compensation amount; A frequency modulation action is performed by comparing the duration of a frequency modulation action with a preset time threshold.

2. The method for primary frequency modulation of a thermal power unit based on signal decomposition according to claim 1, characterized in that: Obtaining a decomposed signal through empirical wavelet transform according to the slip signal includes: obtaining a low-frequency signal and a medium-high frequency signal through empirical wavelet transform according to the slip signal.

3. The method for primary frequency modulation of a thermal power unit based on signal decomposition according to claim 2, characterized in that: According to the decomposed signal and using the power change data, respectively, calculating the primary frequency modulation power change amount setting value and the primary frequency modulation feedforward compensation amount through the unequal rate function and the feedforward function includes: Analyze the low-frequency signal and the medium-high frequency signal by using an unequal rate function to obtain a corresponding first power change, and obtain a second power change corresponding to the differential change according to the medium-high frequency signal differential amount and the gain coefficient; The primary frequency modulation power variation setting value is obtained through amplitude limitation processing according to the first power variation and the second power variation.

4. The method for primary frequency modulation of a thermal power unit based on signal decomposition according to claim 2, characterized in that: According to the decomposed signal and using the power change data, respectively, calculating the primary frequency modulation power change amount setting value and the primary frequency modulation feedforward compensation amount through the unequal rate function and the feedforward function includes: Analyze the low-frequency signal and the medium-high frequency signal through a feedforward function to obtain a corresponding first feedforward compensation amount, and obtain a second feedforward compensation amount corresponding to the differential change according to the differential amount of the medium-high frequency signal and the gain coefficient; The primary frequency modulation feedforward compensation amount is obtained by amplitude limiting processing according to the first feedforward compensation amount and the second feedforward compensation amount.

5. The method for primary frequency modulation of a thermal power unit based on signal decomposition according to claim 1, characterized in that: The comparison result of a frequency modulation action duration and a preset time threshold is used to reset the slip output to zero, including: When the duration of the primary frequency modulation action is greater than or equal to a preset time threshold, the primary frequency modulation power variation setting value and the primary frequency modulation feedforward compensation amount are reset to zero and the primary frequency modulation action is exited.

6. The method for primary frequency modulation of a thermal power unit based on signal decomposition according to claim 1, characterized in that: The comparison result of a frequency modulation action duration and a preset time threshold is used to reset the slip output to zero, including: When the duration of the primary frequency modulation action is less than a preset time threshold, a primary frequency modulation control is performed according to a primary frequency modulation power variation setting value.

7. The method for primary frequency modulation of a thermal power unit based on signal decomposition according to claim 6, characterized in that: The primary frequency modulation control according to the primary frequency modulation power variation setting value also includes: Collect the duration of a frequency modulation action during a frequency modulation control process; When the duration of the primary frequency modulation action is greater than or equal to a preset time threshold, the primary frequency modulation power variation setting value and the primary frequency modulation feedforward compensation amount are reset to zero and the primary frequency modulation action is exited.

8. A primary frequency modulation device for a thermal power unit based on signal decomposition, characterized in that: The device comprises a decomposition module, a calculation module, an analysis module and a control module; The decomposition module is used to perform dead zone processing on the slip to obtain a slip signal, and obtain a decomposition signal through empirical wavelet transform according to the slip signal; The calculation module is used to calculate the primary frequency modulation power change amount setting value and the primary frequency modulation feedforward compensation amount respectively through the unequal rate function and the feedforward function according to the decomposed signal and the power change data; The analysis module is used to determine the duration of the primary frequency modulation action according to the primary frequency modulation power variation setting value and the primary frequency modulation feedforward compensation amount; The control module is used to perform a frequency modulation action according to a comparison result between a duration of a frequency modulation action and a preset time threshold.

9. The primary frequency modulation device of a thermal power unit based on signal decomposition according to claim 8, characterized in that: The decomposition module is used to obtain a low-frequency signal and a medium-high frequency signal according to the slip signal through empirical wavelet transformation.

10. The primary frequency modulation device of a thermal power unit based on signal decomposition according to claim 9, characterized in that: The calculation module includes a power calculation unit, which is used to analyze the low-frequency signal and the medium and high-frequency signal through an unequal rate function to obtain a corresponding first power change, and obtain a second power change corresponding to the differential change according to the differential amount and gain coefficient of the medium and high-frequency signal; and obtain a primary frequency modulation power change setting value through amplitude limitation processing based on the first power change and the second power change.

11. The primary frequency modulation device of a thermal power unit based on signal decomposition according to claim 9, characterized in that: The calculation module includes a compensation calculation unit, which is used to analyze the low-frequency signal and the medium and high-frequency signal through a feedforward function to obtain a corresponding first feedforward compensation amount, and obtain a second feedforward compensation amount corresponding to the differential change according to the differential amount and gain coefficient of the medium and high-frequency signal; and obtain a primary frequency modulation feedforward compensation amount through amplitude limitation processing based on the first feedforward compensation amount and the second feedforward compensation amount.

12. The primary frequency modulation device of a thermal power unit based on signal decomposition according to claim 8, characterized in that: The control module comprises: When the duration of the primary frequency modulation action is greater than or equal to the preset time threshold, the primary frequency modulation power variation setting value and the primary frequency modulation feedforward compensation amount are reset to zero and the primary frequency modulation action is exited; When the duration of the primary frequency modulation action is less than the preset time threshold, a primary frequency modulation control is performed according to the primary frequency modulation power variation setting value and the duration of the primary frequency modulation action during the primary frequency modulation control process is collected.

13. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 7 is implemented.

14. 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 7 is implemented.

15. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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