A method and apparatus for primary frequency regulation control of thermal power units based on frequency edge compensation

Abstract

This invention provides a primary frequency regulation control method and apparatus for thermal power units based on frequency edge compensation, comprising the following steps: inputting the speed deviation signal acquired by the signal acquisition module into the compensation loop and the adder respectively; in the compensation loop, processing the speed deviation signal simultaneously using a frequency edge fluctuation compensation branch and a compensation switching loop; sending the output values ​​of both the frequency edge fluctuation compensation branch and the compensation switching loop to the analog quantity switching function module, and sending the output of the analog quantity switching function module to the adder; inputting the output value of the adder into the frequency regulation output branch for processing and outputting the frequency signal. An increment of 1.5 r / min is added to the original speed deviation to initiate a 10-second primary frequency regulation response, using a response amplitude several times greater to compensate for the previous response deficiency, minimizing the aforementioned primary frequency regulation response omissions.

Description

Technical Field

[0001] This invention relates to the field of thermal power generation technology, and in particular to a method and apparatus for primary frequency regulation control of thermal power units based on frequency edge compensation. Background Technology

[0002] With the significant increase in power transmission from regional power grids and the continuous rise in the proportion of wind power, photovoltaic new energy, and nuclear power in the power structure, the system's rotational inertia and frequency and voltage regulation capabilities are generally declining, weakening the safety foundation. As the main force for power grid frequency regulation and peak shaving, the performance of thermal power generating units is receiving increasing attention. As the primary means of regulating the primary frequency regulation response of the power grid under fault conditions, thermal power units play an increasingly important role in ensuring safety in the new power system. Therefore, the power grid has placed more stringent requirements on the primary frequency regulation performance of thermal power units.

[0003] Currently, the reference frequency used by the power grid to assess the primary frequency regulation performance of thermal power units is the bus frequency of a substation located in the center of the grid. However, the speed signal (generator frequency signal) used for the primary frequency regulation of the generator unit comes from the turbine speed measuring gear or the three-phase bus PT at the generator outlet. These two sources inherently differ. Furthermore, because generator units at different physical nodes in the power grid have different grid frequency characteristics, this leads to timing asynchrony and inherent deviation between the turbine speed signal of the generator unit and the grid reference frequency.

[0004] When the turbine speed of the generator unit fluctuates frequently near the dead zone (1.6 r / min to 2.0 r / min), although the turbine speed deviation has not exceeded the frequency regulation dead zone (±2 r / min), due to the existence of the above-mentioned "different source" situation, the reference frequency in the dispatching WAMS system (primary frequency regulation assessment system) may have exceeded the dead zone. At this time, the DEH system has not triggered the unit's primary frequency regulation action, but the grid's WAMS assessment system has triggered the primary frequency regulation assessment. This leads to the unit's response to some assessment events of the grid being missed.

[0005] The applicant has found at least the following problems in the prior art: the correct operation rate of primary frequency regulation of thermal power units is low, and signal errors can cause response omissions. Summary of the Invention

[0006] The technical problem solved by the embodiments of the present invention is how to improve the correct operation rate of primary frequency regulation of thermal power units and reduce the problem of response omissions caused by signal errors.

[0007] To achieve the above objectives, in one aspect, embodiments of the present invention provide a primary frequency regulation control method for thermal power units based on frequency edge compensation, comprising the following steps:

[0008] The speed deviation signal acquired by the signal acquisition module is input into the compensation circuit and the adder, respectively.

[0009] In the compensation circuit, the speed deviation signal is processed simultaneously by the frequency edge fluctuation compensation branch and the compensation switching circuit;

[0010] The output values ​​of the frequency edge fluctuation compensation branch and the compensation switching loop are sent to the analog quantity switching function module, and the output results of the analog quantity switching function module are sent to the adder.

[0011] The output value of the adder is input into the frequency modulation output branch for processing and output as a frequency signal.

[0012] On the other hand, embodiments of the present invention provide a primary frequency regulation control device for thermal power units based on frequency edge compensation, comprising the following steps:

[0013] The superposition compensation unit is used to input the speed deviation signal acquired by the signal acquisition module into the compensation circuit and the adder respectively;

[0014] The compensation processing unit is used to simultaneously process the speed deviation signal in the compensation circuit by utilizing the frequency edge fluctuation compensation branch and the compensation switching circuit.

[0015] The merging processing unit is used to send the output values ​​of the frequency edge fluctuation compensation branch and the compensation switching loop to the analog quantity switching function module, and send the output results of the analog quantity switching function module to the adder.

[0016] The superposition output unit is used to input the output value of the adder into the frequency modulation output branch for processing and output a frequency signal.

[0017] The above technical solution has the following beneficial effects: By adding a frequency edge fluctuation compensation circuit to the original primary frequency regulation circuit, if the turbine speed fluctuates at the edge of the dead zone for a long time, it is determined that there is a possibility that the power grid assessment frequency has exceeded the frequency regulation dead zone and the power grid assessment system has started the primary frequency regulation assessment. At this time, an increment of 1.5 r / min is added on the original speed deviation to start a primary frequency regulation response for 10 seconds, and the response amplitude is several times larger to make up for the previous response deficiency, thereby minimizing the omission of the above-mentioned primary frequency regulation response. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart of a primary frequency regulation control method for thermal power units based on frequency edge compensation, provided in an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of a primary frequency regulation control device for thermal power units based on frequency edge compensation, provided in an embodiment of the present invention.

[0021] Figure 3 This is a logic block diagram of a primary frequency regulation control method for thermal power units based on frequency edge compensation provided in an embodiment of the present invention.

[0022] Explanation of icon numbers:

[0023] 1. Signal acquisition module; 2. Absolute value calculation module; 3. High / low limit alarm function module; 4. Low alarm function module; 5. High alarm function module; 6. Inverting function module; 7. Delay function module; 8. Pulse function module; 9. Analog quantity switching function module; 10. Analog quantity switching function module; 11. Analog quantity switching function module; 12. Constant amplitude module; 13. Adder; 14. Piecewise function module; 15. Piecewise function module. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The technical solution of the present invention is as follows: In the original primary frequency regulation circuit, a compensation circuit for frequency edge fluctuation is added. If the turbine speed fluctuates at the edge of the dead zone for a long time, an increment of 1.5 r / min is added to the original speed deviation to start a primary frequency regulation response for 10 seconds.

[0026] The specific working principle is as follows:

[0027] When the turbine speed frequency difference (frequency deviation) fluctuates within the range of 1.6 r / min and 2.0 r / min, the output switch quantity 0 of the high / low limit alarm module 3 is processed by the "inverting" module 6 to output switch quantity 1. If the speed deviation fluctuates within the above range for more than 8 seconds, it is predicted that the frequency in the power grid assessment system may have exceeded the primary frequency regulation dead zone. The delay module 7 outputs switch quantity 1, activating the subsequent pulse function module 8, which outputs switch quantity 1 to initiate the primary frequency regulation compensation response. The T1 input terminal of the analog quantity switching module 11 selects an appropriate increment as the output and adds it to the original speed deviation. The value of the increment is selected according to the high / low of the turbine speed. If the turbine speed deviation is greater than 0 r / min, the high alarm module 5 outputs switch quantity 1, and the analog quantity switching module 9 selects 1.5 as the output; otherwise, it selects a constant 0 as the output. If the turbine speed deviation is less than 0 r / min, the low alarm module 4 outputs switch quantity 1, and the analog quantity switching module 10 selects -1.5 as the output. By incrementally superimposing the speed deviation, the speed deviation is brought out of the dead zone, activating a frequency modulation response action that lasts for 10 seconds.

[0028] If the turbine speed frequency difference (frequency deviation) fluctuates within the range of 1.6 r / min and 2.0 r / min for less than 8 seconds, the first frequency regulation compensation response action will not be initiated.

[0029] This invention provides a primary frequency control method for thermal power units based on frequency edge compensation, such as... Figure 1 As shown, it includes the following steps:

[0030] S101: Input the speed deviation signal acquired by signal acquisition module 1 into the compensation circuit and the adder respectively;

[0031] S102: In the compensation circuit, the speed deviation signal is processed simultaneously by the frequency edge fluctuation compensation branch and the compensation switching circuit.

[0032] S103: Send the output value of the frequency edge fluctuation compensation branch and the output value of the compensation switching circuit to the analog quantity switching function module, and send the output result of the analog quantity switching function module to the adder;

[0033] S104: Input the output value of the adder into the frequency modulation output branch for processing and output the frequency signal.

[0034] In the frequency edge fluctuation compensation branch, when the speed deviation fluctuates in the dead zone for more than a set time, 1.5 r / min is automatically added to the original speed deviation.

[0035] In the frequency edge fluctuation compensation branch:

[0036] The speed deviation signal is processed by the absolute value calculation module 2, and the processing result is sent to the alarm function module.

[0037] After being processed by the alarm function module, the output value of the alarm function module is input into the invert function module;

[0038] The output value of the inverting function module is input into the delay function module;

[0039] The output value of the delay function module is input into the pulse function module;

[0040] The output value of the pulse function module is sent to the analog quantity switching function module for processing.

[0041] Set the alarm function block in the compensation switching loop to 0 r / min. The alarm function blocks include a high alarm function block and a low alarm function block; the setpoints for both the high alarm function block and the low alarm function block are 0 r / min.

[0042] Set the delay function module to 8 seconds and the pulse function module to 10 seconds.

[0043] The present invention also provides a primary frequency control device for thermal power units based on frequency edge compensation, such as... Figure 2 As shown, it includes:

[0044] The superposition compensation unit 21 is used to input the speed deviation signal acquired by the signal acquisition module into the compensation circuit and the adder respectively;

[0045] The compensation processing unit 22 is used to process the speed deviation signal simultaneously using the frequency edge fluctuation compensation branch and the compensation switching circuit in the compensation circuit.

[0046] The merging processing unit 23 is used to send the output value of the frequency edge fluctuation compensation branch and the output value of the compensation switching loop to the analog quantity switching function module, and send the output result of the analog quantity switching function module to the adder.

[0047] The superposition output unit 24 is used to input the output value of the adder into the frequency modulation output branch for processing and output a frequency signal.

[0048] In the compensation processing unit, when the speed deviation fluctuates in the dead zone for a longer than a set time, it automatically adds 1.5 r / min to the original speed deviation.

[0049] Used in frequency edge fluctuation compensation branches:

[0050] The speed deviation signal is processed by the absolute value calculation module, and the processing result is sent to the alarm function module.

[0051] After being processed by the alarm function module, the output value of the alarm function module is input into the invert function module;

[0052] The output value of the inverting function module is input into the delay function module;

[0053] The output value of the delay function module is input into the pulse function module;

[0054] The output value of the pulse function module is sent to the analog quantity switching function module for processing.

[0055] This is used to set the setting value of the alarm function block in the compensation switching loop to 0 r / min.

[0056] This is used to set the delay function module's setpoint to 8 seconds and the pulse function module's setpoint to 10 seconds.

[0057] The present invention provides a primary frequency regulation control device for thermal power units based on frequency edge compensation, comprising: a signal acquisition module, an absolute value calculation module, a high / low limit alarm function module, a high limit alarm function module, a low limit alarm module, an inversion operation module, a delay function module, a pulse function module, a ninth analog quantity switching function module, a tenth analog quantity switching function module, an eleventh analog quantity switching function module, a constant assignment module, an adder, a fourteenth piecewise function module, and a fifteenth piecewise function module. The signal acquisition module is connected to the absolute value calculation module, the high-limit alarm module, the low-limit alarm module, and the adder, respectively. The absolute value calculation module is connected to the high / low-limit alarm module. The output of the high / low-limit alarm module is connected to the "invert" calculation module. The "invert" module is connected to the delay function block. The delay function block is connected to the pulse function block. The high alarm module is connected to the switching switch input terminal X of the ninth analog quantity switching module, and the analog quantity input terminals T1 and T2 of the ninth analog quantity switching module are assigned values ​​of 1.5 and 0, respectively. The low alarm module is connected to the switching switch input terminal X of the tenth analog quantity switching module. The analog input terminal T1 of the tenth analog switching module is directly assigned a value of -1.5. The output terminal of the ninth analog switching module is connected to the input terminal T2 of the tenth analog switching module. The pulse output module is connected to the switching switch input terminal X of the eleventh analog switching module. The output terminal of the tenth analog switching module is connected to the analog input terminal T1 of the eleventh analog switching module, and the input terminal T2 is directly assigned a value of 0. The output terminal of the eleventh analog switching module is connected to the adder input terminal X2, and the signal acquisition module is connected to the adder input terminal X1. The output terminal of the adder is connected to the fourteenth / fifteenth piecewise function blocks respectively.

[0058] The alarm function block includes a high alarm function block and a low alarm function block; the setpoints for both the high alarm function block and the low alarm function block are 0 r / min.

[0059] The high / low limit alarm function module has a high alarm setting of 2.0 r / min and a low alarm setting of 1.6 r / min.

[0060] The delay function module is set to 8 seconds.

[0061] The pulse function module is set to 10 seconds.

[0062] The fourteenth segment function module is the primary frequency regulation function on the DEH side. Its output is determined by the speed deviation, speed inequality, and frequency regulation upper and lower limits. The output is the opening increment of the turbine speed regulating valve. All parameters are set according to relevant regulations.

[0063] The fifteenth segment function module is the primary frequency modulation function on the CCS side. Its output is determined by the speed deviation, speed inequality, and frequency modulation upper and lower limits. The output is the increment of the power setpoint. All parameters are set according to relevant regulations.

[0064] This invention adds a frequency edge fluctuation compensation circuit to the original primary frequency regulation circuit. If the turbine speed fluctuates at the edge of the dead zone for a long time, it is determined that there is a possibility that the power grid assessment frequency has exceeded the frequency regulation dead zone and the power grid assessment system has started the primary frequency regulation assessment. At this time, an increment of 1.5 r / min is added to the original speed deviation to start a 10-second primary frequency regulation response. The response amplitude is several times larger to make up for the previous response deficiency and minimize the omission of the primary frequency regulation response.

[0065] Example 1:

[0066] This invention provides a primary frequency control method for thermal power units based on frequency edge compensation, such as... Figure 3 As shown, the logic block diagram includes a signal acquisition module 1, an absolute value calculation module 2, a high / low limit alarm function module 3, a low alarm function module 4, a high alarm module 5, an inversion function module 6, a delay function module 7, a pulse function module 8, an analog quantity switching function module 9, an analog quantity switching function module 10, an analog quantity switching function module 11, a constant amplitude module 12, an adder 13, a piecewise function module 14, and a piecewise function module 15. All of these modules are software algorithm function modules.

[0067] The signal acquisition module is connected to the absolute value calculation module, the high-limit alarm module, the low-limit alarm module, and the adder, respectively; the absolute value calculation module is connected to the high / low-limit alarm module; the output of the high / low-limit alarm module is connected to the "invert" calculation module; the invert module is connected to the delay function block; the delay function block is connected to the pulse function block; the high alarm module 5 is connected to the switching switch input terminal X of the ninth analog quantity switching module, and the analog quantity input terminals T1 and T2 of the ninth analog quantity switching module are assigned values ​​of 1.5 and 0, respectively; the low alarm module 4 is connected to the switching switch input terminal X of the tenth analog quantity switching module, and the... The analog input terminal T1 of the tenth analog switching module is directly assigned a value of -1.5. The output terminal of the ninth analog switching module is connected to the input terminal T2 of the tenth analog switching module. The pulse output module is connected to the switching switch input terminal X of the eleventh analog switching module. The output terminal of the tenth analog switching module is connected to the analog input terminal T1 of the eleventh analog switching module, and the input terminal T2 is directly assigned a value of 0. The output terminal of the eleventh analog switching module is connected to the input terminal X2 of the adder, and the signal acquisition module is connected to the input terminal X1 of the adder. The output terminal of the adder is connected to the fourteenth / fifteenth piecewise function blocks respectively.

[0068] The specific working principle is as follows:

[0069] When the turbine speed frequency difference (frequency deviation) fluctuates within the range of 1.6 r / min and 2.0 r / min, the output switch quantity 0 of the high / low limit alarm module 3 is processed by the "inverting" module 6 to output switch quantity 1. If the speed deviation fluctuates within the above range for more than 8 seconds, it is predicted that the frequency in the power grid assessment system may have exceeded the primary frequency regulation dead zone. The delay module 7 outputs switch quantity 1, activating the subsequent pulse function module 8, which outputs switch quantity 1 to initiate the primary frequency regulation compensation response. The T1 input terminal of the analog quantity switching module 11 selects an appropriate increment as the output and adds it to the original speed deviation. The value of the increment is selected according to the high / low of the turbine speed. If the turbine speed deviation is greater than 0 r / min, the high alarm module 5 outputs switch quantity 1, and the analog quantity switching module 9 selects 1.5 as the output; otherwise, it selects a constant 0 as the output. If the turbine speed deviation is less than 0 r / min, the low alarm module 4 outputs switch quantity 1, and the analog quantity switching module 10 selects -1.5 as the output. By incrementally superimposing the speed deviation, the speed deviation is brought out of the dead zone, activating a frequency modulation response action that lasts for 10 seconds.

[0070] If the turbine speed frequency difference (frequency deviation) fluctuates within the range of 1.6 r / min and 2.0 r / min for less than 8 seconds, the first frequency regulation compensation response action will not be initiated.

[0071] Specific examples:

[0072] The high / low limit alarm function module 3 in the attached diagram has a high alarm setting of 1.6 r / min and a low alarm setting of 2.0 r / min.

[0073] The high alarm function block 5 and the low alarm function block 4 are both set to 0 r / min.

[0074] The delay function module 7 in the attached diagram is set to 8 seconds.

[0075] The pulse function module 8 is set to 10 seconds.

[0076] The "GBT 30370-2022 Guidelines for Primary Frequency Regulation Test and Performance Acceptance of Thermal Power Generating Units" stipulates that the primary frequency regulation dead zone of thermal power generating units is ±2r / min (±0.033Hz), meaning that thermal power generating units only respond when the grid frequency exceeds the dead zone of ±2r / min (±0.033Hz).

[0077] If at a certain moment, the turbine speed of a thermal power unit fluctuates within the range of greater than 3001.6 r / min (50.027 Hz) and less than 3002 r / min (50.033 Hz) (speed deviation within the range of greater than 1.6 r / min and less than 2.0 r / min), and if the grid reference frequency in the primary frequency regulation assessment system is 50.04 Hz at this time, exceeding the primary frequency regulation dead zone of 50 ± 0.033 Hz, the grid assessment system has already initiated the primary frequency regulation assessment. For the primary frequency regulation circuit of a thermal power unit without added "edge fluctuation compensation", it is unable to effectively respond to the above-mentioned frequency regulation event.

[0078] Suppose that at a certain moment, the turbine speed of the thermal power unit is 3001.8 r / min, and the speed deviation is -1.8 r / min. If the grid reference frequency in the primary frequency regulation assessment system is 50.04 Hz at this time, and a primary frequency regulation circuit for the thermal power unit with "edge fluctuation compensation" is added, after the speed deviation remains at 3001.8 r / min for more than 8 seconds, the delay module 7 outputs a switch quantity 1, and then the pulse module 8 outputs a high-level signal for ten seconds, activating the "edge compensation" circuit. The analog quantity switching module 11 selects input terminal T1 as the output. Since the turbine speed deviation at this moment is less than 0 r / min, the output of analog switching module 10 is -1.5. The output of analog switching module 10 is used as the T1 input of analog switching module 11. Therefore, the output of analog switching module 11 is -1.5. Adder 13 adds the output (speed deviation) of signal acquisition module 1 to -1.5. Its output (-1.8-1.5=-3.3) is simultaneously connected to piecewise function 14 / 15. The frequency modulation dead zone is greater than -2 r / min, and a frequency modulation response is initiated.

[0079] If, at a certain moment, the turbine speed of a thermal power unit is greater than 2998.2 r / min, and the speed deviation is 1.8 r / min, and if the grid reference frequency in the primary frequency regulation assessment system is 49.96 Hz, and an "edge fluctuation compensation" primary frequency regulation circuit for the thermal power unit is added, after the speed deviation remains at 2998.2 r / min for more than 8 seconds, the delay module 7 outputs a switch quantity 1, and subsequently the pulse module 8 outputs a high-level signal for ten seconds, activating the "edge compensation" circuit. The analog quantity switching module 11 selects input terminal T1 as the output. Since the turbine speed deviation at this moment is greater than 0 r / min, the output of analog switching module 9 is 1.5, and the output of analog switching module 10 is also 1.5. The output of analog switching module 10 serves as the T1 input of analog switching module 11. Therefore, the output of analog switching module 11 is 1.5 at this time. Adder 13 adds the output (speed deviation) of signal acquisition module 1 to 1.5, and its output (1.81.5=-3.3) is simultaneously connected to piecewise function 14 / 15, exceeding the frequency regulation dead zone of ±2 r / min, and the unit's primary frequency regulation response is initiated.

[0080] This invention adds a frequency edge fluctuation compensation circuit to the original primary frequency regulation circuit. If the turbine speed fluctuates at the edge of the dead zone for a long time, it is determined that there is a possibility that the power grid assessment frequency has exceeded the frequency regulation dead zone and the power grid assessment system has started the primary frequency regulation assessment. At this time, an increment of 1.5 r / min is added to the original speed deviation to start a 10-second primary frequency regulation response. The response amplitude is several times larger to make up for the previous response deficiency and minimize the omission of the primary frequency regulation response.

[0081] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0082] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features of the single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the invention.

[0083] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed herein.

[0084] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described in this application are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0085] Those skilled in the art will also understand that the various illustrative logical blocks, units, and steps listed in the embodiments of the present invention can be implemented by electronic hardware, computer software, or a combination of both. To clearly demonstrate the interchangeability of hardware and software, the functions of the various illustrative components, units, and steps described above have been generally described. Whether such functionality is implemented through hardware or software depends on the specific application and the overall system design requirements. Those skilled in the art can implement the described functions using various methods for each specific application, but such implementation should not be construed as exceeding the scope of protection of the embodiments of the present invention.

[0086] The various illustrative logic blocks or units described in the embodiments of this invention can be implemented or operate the described functions using a general-purpose processor, digital signal processor, application-specific integrated circuit (ASIC), field-programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. The general-purpose processor can be a microprocessor; alternatively, it can be any conventional processor, controller, microcontroller, or state machine. The processor can also be implemented using a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration.

[0087] The steps of the methods or algorithms described in the embodiments of this invention can be directly embedded in hardware, a software module executed by a processor, or a combination of both. The software module can be stored in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium in the art. Exemplarily, the storage medium can be connected to the processor so that the processor can read information from and write information to the storage medium. Optionally, the storage medium can also be integrated into the processor. The processor and storage medium can be housed in an ASIC, which can be housed in a user terminal. Optionally, the processor and storage medium can also be housed in different components of the user terminal.

[0088] In one or more exemplary designs, the functions described in the embodiments of the present invention can be implemented in hardware, software, firmware, or any combination of these three. If implemented in software, these functions can be stored on a computer-readable medium or transmitted on a computer-readable medium in the form of one or more instructions or code. Computer-readable media include computer storage media and communication media that facilitate the transfer of computer programs from one place to another. Storage media can be any available media that can be accessed by a general-purpose or special-purpose computer. For example, such computer-readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store program code in the form of instructions or data structures and other forms that can be read by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Furthermore, any connection can be suitably defined as a computer-readable medium, for example, if the software is transmitted from a website, server or other remote resource via a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wirelessly, such as infrared, wireless and microwave, it is also included in the defined computer-readable medium. The disks and discs mentioned include compressed disks, laser discs, optical discs, DVDs, floppy disks, and Blu-ray discs. Disks typically copy data magnetically, while disks typically copy data optically using lasers. Combinations of the above can also be contained in computer-readable media.

[0089] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. 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 within the scope of protection of the present invention.

Claims

1. A primary frequency regulation control method for thermal power units based on frequency edge compensation, characterized in that, Includes the following steps: The speed deviation signal acquired by the signal acquisition module is input into the compensation circuit and the adder, respectively. In the compensation circuit, the speed deviation signal is processed simultaneously by the frequency edge fluctuation compensation branch and the compensation switching circuit; The output values ​​of the frequency edge fluctuation compensation branch and the compensation switching loop are sent to the analog quantity switching function module, and the output results of the analog quantity switching function module are sent to the adder. The output value of the adder is input into the frequency modulation output branch for processing and output as a frequency signal; In the frequency edge fluctuation compensation branch, when the speed deviation fluctuates in the dead zone for more than a set time, 1.5 r / min is automatically added to the original speed deviation. In the frequency edge fluctuation compensation branch: The speed deviation signal is processed by the absolute value calculation module, and the processing result is sent to the alarm function module. After being processed by the alarm function module, the output value of the alarm function module is input into the invert function module; The output value of the inverting function module is input into the delay function module; The output value of the delay function module is input into the pulse function module; The output value of the pulse function module is sent to the analog quantity switching function module for processing. Set the alarm function block setting in the compensation switching loop to 0 r / min; Set the delay function module to 8 seconds and the pulse function module to 10 seconds.

2. A primary frequency control device for thermal power units based on frequency edge compensation, characterized in that, include: The superposition compensation unit is used to input the speed deviation signal acquired by the signal acquisition module into the compensation circuit and the adder respectively; The compensation processing unit is used to simultaneously process the speed deviation signal in the compensation circuit by utilizing the frequency edge fluctuation compensation branch and the compensation switching circuit. The merging processing unit is used to send the output values ​​of the frequency edge fluctuation compensation branch and the compensation switching loop to the analog quantity switching function module, and send the output results of the analog quantity switching function module to the adder. The superposition output unit is used to input the output value of the adder into the frequency modulation output branch for processing and output a frequency signal; In the compensation processing unit, when the speed deviation fluctuates in the dead zone for more than a set time, 1.5 r / min is automatically added to the original speed deviation. Used in frequency edge fluctuation compensation branches: The speed deviation signal is processed by the absolute value calculation module, and the processing result is sent to the alarm function module. After being processed by the alarm function module, the output value of the alarm function module is input into the invert function module; The output value of the invert function module is input into the delay function module; The output value of the delay function module is input into the pulse function module; The output value of the pulse function module is sent to the analog quantity switching function module for processing. Used to set the set value of the alarm function block in the compensation switching loop to 0 r / min; This is used to set the delay function module's setpoint to 8 seconds and the pulse function module's setpoint to 10 seconds.

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