A control strategy, equipment, medium and system for super-capacitor coupled thermal power unit

Abstract

The present invention discloses a control strategy, equipment, medium and system for an over-capacity coupled thermal power unit, which belongs to the field of power grid dispatching technology and aims to improve the response accuracy and efficiency of the unit to frequency modulation instructions. The strategy first decomposes the received frequency modulation instruction into a number of sub-frequency modulation instructions of the same time length, so as to manage the output adjustment process of the unit in a more detailed manner. Subsequently, within each sub-frequency modulation instruction cycle, the response error is calculated based on the current sub-instruction, the actual output of the unit and the over-capacity output. Based on this error, the unit output of the next time period is adjusted and corrected in real time to ensure that the unit output can closely follow the changes in the frequency modulation instruction until the entire frequency modulation instruction is executed. This strategy effectively improves the flexibility and accuracy of thermal power units in participating in the power grid frequency modulation process by finely decomposing the frequency modulation instruction and dynamically adjusting the unit output.

Description

Technical Field

[0001] The present invention belongs to the technical field of power grid dispatching, and relates to a control strategy, equipment, medium and system for an ultra-capacitor coupled thermal power unit. Background Art

[0002] In the power system, frequency regulation is an important mechanism to maintain the stable operation of the power grid, and its importance is self-evident. With the increasing demand for electricity and the complexity of the power grid structure, ensuring the stability of the power grid frequency is of vital importance to ensuring the quality of power supply, promoting the healthy development of the power market, and improving user satisfaction.

[0003] The core of the traditional frequency regulation method is that the power dispatching center accurately calculates and issues frequency regulation instructions P to each frequency regulation resource based on the actual deviation of the grid frequency and the predicted load change. J ) as the main frequency regulation force, responding to frequency regulation needs by adjusting its output power; at the same time, the overcapacity equipment (P C ) as an auxiliary means, with its fast response and flexible adjustment capabilities, it further enhances the overall efficiency of the FM system.

[0004] However, in actual operation, P≠P J +P C There is a situation where there is a deviation between the frequency regulation instruction and the actual response frequency regulation amount. This adjustment deviation will directly affect the frequency regulation accuracy, thereby reducing the frequency regulation income of the power plant and the overall operation efficiency of the power grid. Summary of the invention

[0005] The purpose of the present invention is to provide a control strategy, equipment, medium and system for a super-capacitor coupled thermal power unit to solve the problem that there is a deviation between the frequency regulation instruction and the actual response frequency regulation amount, resulting in reduced frequency regulation accuracy.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A first aspect of the present invention provides a control strategy for an ultra-capacitor coupled thermal power unit, comprising the following steps:

[0008] S1, obtaining a frequency modulation instruction, and dividing the frequency modulation instruction into N sub-frequency modulation instructions with the same time length;

[0009] S2, based on each sub-frequency regulation instruction and its corresponding unit output and over-capacity output, calculate the response error, and correct the unit output of the next period based on the response error until the frequency regulation instruction ends.

[0010] Preferably, the response error is calculated based on each sub-frequency modulation instruction and its corresponding unit output and over-capacity output, and the unit output of the next period is corrected based on the response error until the frequency modulation instruction ends. The specific method is:

[0011] Calculate the response error based on each sub-frequency modulation instruction and its corresponding unit output and over-capacity output;

[0012] Decompose the response error to obtain the low-frequency error;

[0013] Based on the low-frequency error, the unit output of the next period is pre-corrected to obtain the corrected unit output of the next period;

[0014] Based on the excess capacity output corresponding to the sub-frequency modulation instruction of the next period and the corrected unit output of the next period, respond to the corresponding sub-frequency modulation instruction;

[0015] The above process is repeated until the frequency modulation instruction ends.

[0016] The error response is:

[0017]

[0018] in, for t Sub-FM instructions for the time period, for t The unit output during the period, for t Excessive output during a period of time.

[0019] Preferably, the decomposition response error is specifically performed by:

[0020]

[0021] in, is the response error in period t, for t Gamma distribution of the probability that the response error for a period is greater than zero; is the decomposition function; represents the integral, and the integral interval is ; for of Power; is the independent variable of the complex domain, is an imaginary unit, Represents the angular frequency.

[0022] Preferably, the unit output of the next period is pre-corrected based on the low-frequency error to obtain the corrected unit output of the next period, and the specific method is:

[0023] Based on the low-frequency error, calculate the unit output compensation for the next period:

[0024]

[0025] in, For the k +1 period unit output compensation, For the k The low-frequency error of the time period, For the i Unit output compensation for the period, For the i The correlation coefficient of the time period, s is the inertia coefficient; represents the summation symbol;

[0026] Based on the unit output compensation of the next period, the unit output of the next period is pre-corrected to obtain the corrected unit output of the next period.

[0027] Preferably, the coefficient of inertia Described as:

[0028]

[0029] No. i Correlation coefficient of time period Described as:

[0030]

[0031] in, e is the Euler number.

[0032] Furthermore, the corrected unit output of the next time period is the sum of the unit output corresponding to the sub-frequency modulation instruction of the next time period and the unit output compensation of the next time period.

[0033] A second aspect of the present invention 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-mentioned super-capacitor coupled thermal power unit control strategy when executing the computer program.

[0034] A third aspect of the present invention 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, the above-mentioned super-capacitor coupled thermal power unit control strategy is implemented.

[0035] A fourth aspect of the present invention provides a super-capacitor coupled thermal power unit control system, comprising:

[0036] A segmentation module is used to obtain a frequency modulation instruction and divide the frequency modulation instruction into N sub-frequency modulation instructions with the same time length;

[0037] The correction module is used to calculate the response error based on each sub-frequency regulation instruction and its corresponding unit output and over-capacity output, and correct the unit output of the next period based on the response error until the frequency regulation instruction ends.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention discloses a control strategy for over-capacity coupled thermal power units. The strategy divides the frequency modulation instruction into a plurality of sub-frequency modulation instructions of the same time length. In each sub-frequency modulation cycle, the response error is calculated according to the actual response of the unit output and the over-capacity output, and the output of the next period is promptly corrected accordingly. This dynamic adjustment mechanism effectively reduces the frequency modulation deviation caused by response delay or uncertainty, significantly improves the frequency modulation accuracy, and ensures that the grid frequency is stable near the rated value.

[0040] Furthermore, the present invention achieves optimal allocation and efficient utilization of resources by subdividing the response error into low-frequency error and high-frequency error, processing the low-frequency error, and adjusting the unit output accordingly; the unit undertakes the task of correcting the low-frequency error with its stable output power, improves the frequency regulation efficiency, extends the service life of the equipment, and reduces the operating cost.

[0041] The control system of the overcapacity coupled thermal power unit of the present invention decomposes the complex frequency modulation instruction into a series of sub-frequency modulation instructions of the same time length and easier to manage through the segmentation module; this segmentation processing method not only simplifies the complexity of the frequency modulation task, but also improves the system's response speed to changes in the frequency modulation instruction; by flexibly adjusting the number and duration of the sub-frequency modulation instructions, the system can better adapt to the fluctuation characteristics of the power grid load and ensure the accurate execution of the frequency modulation instruction; the correction module calculates the response error in real time based on the actual execution effect of each sub-frequency modulation instruction (i.e., the response of the unit output and the overcapacity output), and pre-corrects the unit output for the next time period accordingly; this dynamic adjustment mechanism ensures that the system can quickly identify and correct deviations in the frequency modulation process, thereby improving the real-time correction capability of the frequency modulation accuracy; through continuous iteration of the correction process, the system can gradually approach and achieve the ideal frequency modulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 This is a block diagram of the control strategy of the super-capacitor coupled thermal power unit of the present invention;

[0044] Figure 2 This is a flow chart of the control strategy of the super-capacitor coupled thermal power unit of the present invention;

[0045] Figure 3 This is a block diagram of the control system of the super-capacitor coupled thermal power unit of the present invention.

[0046] Among them, 301-segmentation module; 302-correction module. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and marked in the drawings here can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0050] Terminology explanation:

[0051] 1. Mean absolute percentage error, the English name is Mean Absolute Percentage Error, abbreviated as MAPE.

[0052] 2. Hard disk drive, the English name is Hard-Disk Drive, abbreviated as HDD.

[0053] 3. Solid State Drive, the English name is Solid State Disk, abbreviated as SSD.

[0054] 4. Flash drive, the English name is Universal Serial Bus, abbreviated as USB.

[0055] 5. Compact Disc Read-Only Memory, abbreviated as CD-ROM.

[0056] 6. Digital Video Disc, abbreviated as DVD.

[0057] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0058] See also Figure 1 The present invention discloses a control strategy for a super-capacitor coupled thermal power unit, comprising the following steps:

[0059] S1, obtaining a frequency modulation instruction, and dividing the frequency modulation instruction into N sub-frequency modulation instructions with the same time length;

[0060] The power grid dispatch center issues a frequency regulation instruction to the thermal power plant, requiring it to adjust the system frequency to the target value. The instruction includes the direction of the frequency regulation (up or down), the target frequency value, and the completion time requirement.

[0061] After receiving the frequency modulation instruction, the power plant control system first decomposes the frequency modulation instruction into N sub-frequency modulation instructions of the same time length according to the total duration of the frequency modulation instruction and the preset time accuracy.

[0062] S2, based on each sub-frequency regulation instruction and its corresponding unit output and over-capacity output, calculate the response error, and correct the unit output of the next period based on the response error until the frequency regulation instruction ends;

[0063] For each sub-frequency regulation instruction, the control system first preliminarily allocates the unit output and excess capacity output according to the current unit output and the status of the excess capacity energy storage equipment; the unit output is mainly responsible for meeting basic power needs, while the excess capacity output is used to quickly respond to frequency regulation needs.

[0064] At the end of the execution of each sub-frequency modulation instruction, the control system collects the actual frequency change data, compares it with the target frequency of the sub-frequency modulation instruction, and calculates the response error; the response error reflects the deviation between the current frequency modulation measure and the target.

[0065] Based on the response error calculated in the previous step, the unit output for the next period is dynamically adjusted. If the response error is positive (i.e. the actual frequency is higher than the target frequency), the unit output is appropriately reduced; otherwise, it is increased.

[0066] Repeat the above process until all sub-frequency modulation instructions are executed and the system frequency stabilizes and reaches the target value.

[0067] By implementing the super-capacitor coupled thermal power unit control strategy of the present invention, the power plant has demonstrated higher flexibility and accuracy in the process of power grid frequency regulation. Compared with the traditional single unit frequency regulation method, this strategy effectively shortens the frequency regulation response time, reduces the frequency fluctuation amplitude, and improves the stability and power supply quality of the power grid. At the same time, the addition of super-capacitor energy storage equipment also improves the utilization efficiency of energy and reduces the cost of power generation.

[0068] See also Figure 2 The present invention discloses a control strategy for a super-capacitor coupled thermal power unit, comprising the following steps:

[0069] S1, obtaining a frequency modulation instruction, and dividing the frequency modulation instruction into N sub-frequency modulation instructions with the same time length;

[0070] The power grid dispatch center issues a frequency regulation instruction to the thermal power plant, requiring it to adjust the system frequency to the target value. The instruction includes the direction of the frequency regulation (up or down), the target frequency value, and the completion time requirement.

[0071] After receiving the frequency modulation instruction, the power plant control system first decomposes the frequency modulation instruction into N sub-frequency modulation instructions of the same time length according to the total time length of the frequency modulation instruction and the preset time accuracy. In this embodiment, the frequency modulation instruction is divided into 10 intervals.

[0072] S2, based on each sub-frequency regulation instruction and its corresponding unit output and over-capacity output, calculate the response error, and correct the unit output of the next period based on the response error until the frequency regulation instruction ends.

[0073] S201, calculating a response error based on each sub-frequency modulation instruction and its corresponding unit output and over-capacity output;

[0074] For each sub-frequency regulation instruction, the control system first preliminarily allocates the unit output and excess capacity output according to the current unit output and the status of the excess capacity energy storage equipment; the unit output is mainly responsible for meeting basic power needs, while the excess capacity output is used to quickly respond to frequency regulation needs.

[0075] At the end of the execution of each sub-frequency modulation instruction, the control system collects the actual frequency change data, compares it with the target frequency of the sub-frequency modulation instruction, and calculates the response error; the response error reflects the deviation between the current frequency modulation measure and the target.

[0076] The error response is:

[0077] in, for t Sub-FM instructions for the time period, for t The unit output during the period, for tExcessive output during a period of time.

[0078] S202, decomposing the response error to obtain a low-frequency error;

[0079] The calculated response error is further decomposed into low-frequency error. The low-frequency error reflects the long-term, slow-changing regulation deviation of the system. The specific method of decomposing the response error is:

[0080]

[0081] in is the response error, for t Gamma distribution of the probability that the period response error is greater than zero.

[0082] S203, pre-correcting the unit output for the next period based on the low-frequency error to obtain a corrected unit output for the next period;

[0083] The method of pre-correcting the unit output of the next period based on the low-frequency error to obtain the corrected unit output of the next period is as follows:

[0084] Calculate the unit output compensation for the next period:

[0085] in, For the k +1 period unit output compensation, For the k The low-frequency error of the time period, For the i Unit output compensation for the period, For the i The correlation coefficient of the time period, s is the inertia coefficient;

[0086] Based on the unit output compensation of the next period, the unit output of the next period is pre-corrected to obtain the corrected unit output of the next period: the corrected unit output of the next period is the sum of the unit output corresponding to the sub-frequency modulation instruction of the next period and the unit output compensation of the next period.

[0087] S204, responding to the corresponding sub-frequency modulation instruction based on the corrected unit output of the next period and the corrected excess capacity output of the next period;

[0088] S205, iterate the above process until the frequency modulation instruction ends.

[0089] In order to verify the advantages of the control strategy of the super-capacitor coupled thermal power unit proposed in the present invention in practical applications, we designed and implemented a set of comparative experiments. In the experiment, two groups of representative frequency modulation instructions (frequency modulation instruction 1 and frequency modulation instruction 2) were selected, and the traditional control method (that is, the control strategy of the present invention is not adopted) and the control method proposed by the present invention were used to respond to these two groups of frequency modulation instructions. Frequency modulation instruction 1 represents a large load fluctuation, while frequency modulation instruction 2 represents a relatively stable load demand. The mean absolute percentage error (MAPE) is used as a key indicator to measure the actual response accuracy of the dispatch instruction. The results are as follows:

[0090]

[0091] The results show that when faced with large load fluctuations, the average absolute error percentage of the traditional control method reaches 18.8%, indicating that its response accuracy is low and it is difficult to accurately follow the command changes. After adopting the control strategy proposed in the present invention, the average absolute error percentage is significantly reduced to 6.7%, proving the significant advantages of this method in improving the unit's ability to respond to large load fluctuations; in scenarios where load changes are relatively stable, the average absolute error percentage of the traditional method still reaches 7.2%, indicating that its response stability still needs to be improved. The method of the present invention further reduces the average absolute error percentage to 2.1%, demonstrating the ability to maintain high-precision control in a variety of load change scenarios.

[0092] This embodiment provides an electronic device that integrates the control strategy of super-capacitor coupled thermal power units, aiming to achieve precise control of the operating state of thermal power units through efficient computing and data processing capabilities, improve energy utilization efficiency, reduce operating costs, and promote the stable operation of the power system. The device can be any device with computing capabilities such as a personal computer, workstation, server, embedded system, smart terminal, etc.; the device is mainly composed of the following parts: high-performance memory, advanced processor, and computer program pre-installed in the memory and executable on the processor. These components work together to realize the application of the control strategy of super-capacitor coupled thermal power units. The memory includes a high-speed, large-capacity solid-state hard disk (SSD) or dynamic random access memory, etc., which can be used as a medium for storing data.

[0093] The present invention also discloses a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the control strategy of the super-capacitor coupled thermal power unit is implemented; the storage medium of the present invention is a non-volatile or readable and writable data storage device, which is designed to store and retain computer program instructions. The storage medium can be, but is not limited to, a hard disk drive (HDD), a solid-state drive (SSD), a flash drive (such as a USB flash drive), an optical disk (such as a CD-ROM, a DVD), a virtual storage space in a cloud storage service, or any other medium that can store and allow a computer to access and execute program codes. The computer program stored on the computer-readable storage medium is specially designed to implement the control strategy of the super-capacitor coupled thermal power unit. The program contains all the algorithms, logics and data structures required to implement the control strategy, and can guide the processor to monitor, analyze and control the operating status of the thermal power unit in real time.

[0094] See also Figure 3 The present invention also discloses a super-capacitor coupled thermal power unit control system, comprising:

[0095] The segmentation module 301 is used to obtain the frequency modulation instruction and divide the frequency modulation instruction into N sub-frequency modulation instructions with the same time length;

[0096] The correction module 302 is used to calculate the response error based on each sub-frequency regulation instruction and its corresponding unit output and over-capacity output, and correct the unit output of the next period based on the response error until the frequency regulation instruction ends.

[0097] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control strategy for super-capacitor coupled thermal power units, characterized in that: The following steps are involved: S1, obtaining a frequency modulation instruction, and dividing the frequency modulation instruction into N sub-frequency modulation instructions with the same time length; S2, based on each sub-frequency regulation instruction and its corresponding unit output and over-capacity output, calculate the response error, and correct the unit output of the next period based on the response error until the frequency regulation instruction ends. The specific method is as follows: Calculate the response error based on each sub-frequency modulation instruction and its corresponding unit output and over-capacity output; Decompose the response error to obtain the low-frequency error; Based on the low-frequency error, the unit output of the next period is pre-corrected to obtain the corrected unit output of the next period. The specific method is as follows: Based on the low-frequency error, calculate the unit output compensation for the next period: in, For the k +1 period unit output compensation, For the k The low-frequency error of the time period, For the i Unit output compensation for the period, For the i The correlation coefficient of the time period, is the coefficient of inertia; represents the summation symbol; Based on the unit output compensation of the next period, the unit output of the next period is pre-corrected to obtain the corrected unit output of the next period; Based on the excess capacity output corresponding to the sub-frequency modulation instruction of the next period and the corrected unit output of the next period, respond to the corresponding sub-frequency modulation instruction; The above process is repeated until the frequency modulation instruction ends.

2. The control strategy for super-capacitor coupled thermal power units according to claim 1 is characterized in that: The response error is: in, for t Sub-frequency modulation instructions for the time period, for t The unit output during the period, for t Excessive output during a period of time; for t The response error of the time period.

3. The control strategy for super-capacitor coupled thermal power units according to claim 1 is characterized in that: The decomposition response error is specifically: in, is the response error in period t, for t Gamma distribution of the probability that the response error of a period is greater than zero; is the decomposition function; represents the integral, and the integral interval is ; for of Power; is the independent variable of the complex domain, is an imaginary unit, Represents the angular frequency.

4. The control strategy for super-capacitor coupled thermal power units according to claim 1 is characterized in that: Inertia coefficient Described as: No. i Correlation coefficient of time period Described as: in, e is the Euler number.

5. The control strategy for super-capacitor coupled thermal power units according to claim 1 is characterized in that: The corrected unit output of the next period is the sum of the unit output corresponding to the sub-frequency modulation instruction of the next period and the unit output compensation of the next period.

6. An electronic device, characterized in that: It comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the control strategy of the super-capacitor coupled thermal power unit as claimed in any one of claims 1 to 5 when executing the computer program.

7. 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 control strategy of the super-capacitor coupled thermal power unit according to any one of claims 1 to 5 is implemented.

8. A super-capacitor coupled thermal power unit control system, based on the super-capacitor coupled thermal power unit control strategy of claim 1, comprising: A segmentation module is used to obtain a frequency modulation instruction and divide the frequency modulation instruction into N sub-frequency modulation instructions with the same time length; The correction module is used to calculate the response error based on each sub-frequency regulation instruction and its corresponding unit output and over-capacity output, and correct the unit output of the next period based on the response error until the frequency regulation instruction ends.

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