Steam turbine control method, device and equipment in thermal power unit and storage medium

Abstract

The application discloses a steam turbine control method, device and equipment in a thermal power unit and a storage medium, relates to the technical field of frequency modulation cooperative control of a thermal power unit, and comprises the following steps: screening an actual measured frequency of a power grid bus and an equivalent frequency of the unit to obtain an effective frequency; obtaining a power grid frequency deviation based on a preset power grid rated frequency and the effective frequency; when the power grid frequency deviation is not located in a preset frequency dead zone range, generating a single frequency modulation output instruction based on the power grid frequency deviation; acquiring an automatic power generation control load instruction; when it is identified that the automatic power generation control load instruction and the single frequency modulation output instruction exist conflicts, adjusting a steam turbine main control instruction generated according to the single frequency modulation output instruction and the automatic power generation control load instruction to drive the steam turbine main control based on a load change amount in the automatic power generation control load instruction. The technical scheme can realize the technical effect that the steam turbine main control completely executes the output instruction according to the single frequency modulation theoretical demand value during single frequency modulation action.

Description

Technical Field

[0001] This application relates to the field of frequency regulation and coordinated control technology for thermal power units, and in particular to a steam turbine control method, device, equipment and storage medium in a thermal power unit. Background Technology

[0002] With the continuous expansion of the power grid and the increasing proportion of renewable energy grid connection, power grid frequency fluctuations are characterized by increased frequency and faster rate of change. Power dispatching agencies are placing increasingly stringent requirements on the single-time frequency regulation response performance of grid-connected units. Simultaneously, the frequency and rate of load command issuance and regulation by Automatic Generation Control (AGC) are also continuously increasing, leading to thermal power units frequently facing simultaneous operation of single-time frequency regulation transient regulation and AGC steady-state load dispatch within the same control cycle.

[0003] Currently, thermal power units generally adopt a control scheme that directly algebraically superimposes AGC load commands and single-frequency regulation output commands before outputting them to the turbine main control unit, without setting priority distinction logic between the two systems. When the AGC load adjustment direction is opposite to the single-frequency regulation action direction, the change in the AGC load command will directly cancel the instantaneous output command of the single-frequency regulation, causing the actual adjustment of the unit to be less than the theoretical requirement value of the single-frequency regulation, resulting in insufficient single-frequency regulation response amplitude and prolonged regulation lag time. At the same time, due to the continuous conflict between the two systems in the adjustment direction, the turbine control valve frequently reverses with small amplitude movements under the action of opposite commands, increasing the mechanical wear of the speed control system. Summary of the Invention

[0004] The main objective of this application is to provide a steam turbine control method, device, equipment, and storage medium for thermal power units, aiming to solve the technical problem of how to ensure the effectiveness of the single frequency regulation output action of the main control of the steam turbine.

[0005] To achieve the above objectives, this application proposes a steam turbine control method for thermal power units, the method comprising: Obtain the equivalent frequency of the generating unit and the measured frequency of the power grid bus; The effective frequencies are obtained by screening the measured frequencies of the power grid bus and the equivalent frequencies of the generating units; The power grid frequency deviation is obtained based on the preset rated frequency and effective frequency of the power grid; When the grid frequency deviation is not within the preset frequency dead zone, a single frequency regulation output command is generated based on the grid frequency deviation. Acquire automatic generation control load commands and identify command conflicts between single frequency regulation output commands and automatic generation control load commands; When a conflict is detected between the automatic generation control load command and the single frequency regulation output command, the turbine main control command is generated based on the single frequency regulation output command and the automatic generation control load command, and the turbine main control command is adjusted based on the load change in the automatic generation control load command. The turbine main control is driven by the adjusted turbine main control commands.

[0006] In one embodiment, the effective frequency is obtained by filtering the measured frequency of the power grid bus and the equivalent frequency of the generating units, including: The real-time deviation value is obtained based on the measured frequency of the power grid bus and the equivalent frequency of the generating unit; When the real-time deviation value is less than or equal to the preset deviation threshold, the unit's equivalent frequency is taken as the effective frequency; When the real-time deviation value is greater than the preset deviation threshold, the equivalent frequency of the unit is inspected to obtain the inspection results; If the test result is "passed", the unit's equivalent frequency will be used as the effective frequency. If the test result is that the test fails, the measured frequency of the power grid bus shall be taken as the effective frequency.

[0007] In one embodiment, when the grid frequency deviation is not within a preset frequency dead zone, a single frequency modulation output command is generated based on the grid frequency deviation, including: When the grid frequency deviation is not within the preset frequency dead zone, obtain the preset speed unequal rate and rated power of the unit; The target power of the unit is obtained based on the preset grid rated frequency, the preset speed unequal rate of the unit, the rated power of the unit and the grid frequency deviation; Based on the unit's target power, a single frequency regulation output command is generated.

[0008] In one embodiment, acquiring automatic generation control load commands and identifying command conflicts between single frequency regulation output commands and automatic generation control load commands includes: Obtain automatic generation control load commands and parse them to obtain load changes; When the effective frequency is less than the preset grid rated frequency and the grid frequency deviation is negative, the power increase direction will be used as the power adjustment direction of a single frequency modulation output command. When the effective frequency is greater than the preset grid rated frequency and the grid frequency deviation is positive, the power reduction direction will be used as the power adjustment direction of a single frequency modulation output command. The direction of load adjustment is determined based on the magnitude of the load change. When the power regulation direction is opposite to the load regulation direction, it is determined that there is a command conflict between the single frequency regulation output command and the automatic generation control load command.

[0009] In one embodiment, the method further includes: When the power regulation direction is consistent with the load regulation direction, it is determined that there is no command conflict between the single frequency regulation output command and the automatic generation control load command; When it is determined that there is no conflict between the single frequency regulation output command and the automatic generation control load command, the turbine main control command is generated based on the single frequency regulation output command and the automatic generation control load command to drive the turbine main control.

[0010] In one embodiment, after obtaining the power grid frequency deviation based on a preset rated power grid frequency and effective frequency, the method further includes: During the process of driving the main control of the steam turbine, the step of obtaining the equivalent frequency of the unit and the measured frequency of the grid bus is returned to the execution to obtain the grid frequency deviation. When the grid frequency deviation is within the preset frequency dead zone range, an automatic generation control load command is obtained; Based on the automatic generation control load command, the turbine main control command is generated to drive the turbine main control.

[0011] In one embodiment, obtaining the unit's equivalent frequency and the measured frequency of the power grid bus includes: The measured frequency of the power grid bus output by the external frequency acquisition device and the real-time speed of the turbine shaft are acquired by the local turbine speed probe. The real-time rotational speed of the turbine shaft is converted to obtain the unit's equivalent frequency.

[0012] Furthermore, to achieve the above objectives, this application also proposes a steam turbine control device for a thermal power unit, which includes: The input module is used to obtain the unit's equivalent frequency and the measured frequency of the power grid bus. The filtering module is used to filter the measured frequency of the power grid bus and the equivalent frequency of the generating unit to obtain the effective frequency; The deviation module is used to obtain the power grid frequency deviation based on the preset rated frequency and effective frequency of the power grid; The generation module is used to generate a single frequency regulation output command based on the grid frequency deviation when the grid frequency deviation is not within the preset frequency dead zone range. The conflict module is used to acquire automatic generation control load commands and identify command conflicts between single frequency regulation output commands and automatic generation control load commands. The adjustment module is used to generate turbine main control commands based on the single frequency regulation output command and the automatic generation control load command when a conflict is detected between the automatic generation control load command and the single frequency regulation output command, and to adjust the turbine main control commands based on the load change in the automatic generation control load command. The output module is used to drive the turbine main control based on the adjusted turbine main control instructions.

[0013] In addition, to achieve the above objectives, this application also proposes a steam turbine control device for a thermal power unit, the device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the steam turbine control method for a thermal power unit as described above.

[0014] In addition, to achieve the above objectives, this application also proposes a storage medium that is a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the steps of the steam turbine control method in a thermal power unit as described above.

[0015] In addition, to achieve the above objectives, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the steam turbine control method in a thermal power unit as described above.

[0016] One or more technical solutions proposed in this application have at least the following technical effects: The process involves acquiring the equivalent frequency of the generating unit and the measured frequency of the grid bus; filtering the measured frequency of the grid bus and the equivalent frequency of the generating unit to obtain the effective frequency; obtaining the grid frequency deviation based on the preset grid rated frequency and the effective frequency; generating a single frequency regulation output command based on the grid frequency deviation when the grid frequency deviation is not within the preset frequency dead zone; acquiring the automatic generation control load command and identifying command conflicts between the single frequency regulation output command and the automatic generation control load command; and identifying conflicts between the automatic generation control load command and the single frequency regulation output command. At the same time, the turbine main control command is generated based on the single frequency regulation output command and the automatic generation control load command, and the turbine main control command is adjusted based on the load change in the automatic generation control load command. The technical means of driving the turbine main control based on the adjusted turbine main control command eliminates the superposition and cancellation effect of the reverse regulation of the automatic generation control load change on the single frequency regulation output command, solves the technical problem of ensuring the effectiveness of the single frequency regulation output action of the turbine main control, and realizes the technical effect of the turbine main control fully executing the output command according to the theoretical demand value of the single frequency regulation during the single frequency regulation action. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without any creativity or effort.

[0019] Figure 1 This is a flowchart illustrating an embodiment of the steam turbine control method for thermal power units in this application. Figure 2 This is a flowchart illustrating Embodiment 2 of the steam turbine control method for thermal power units in this application; Figure 3 This is a simplified flowchart illustrating Embodiment 2 of the steam turbine control method for thermal power units in this application. Figure 4 This is a schematic diagram of the module structure of the steam turbine control device in a thermal power unit according to an embodiment of this application; Figure 5 This is a schematic diagram of the equipment structure of the hardware operating environment involved in the steam turbine control method of the thermal power unit in the embodiments of this application.

[0020] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0022] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0023] The main solution of this application embodiment is as follows: Obtain the equivalent frequency of the generating unit and the measured frequency of the power grid bus; filter the measured frequency of the power grid bus and the equivalent frequency of the generating unit to obtain an effective frequency; obtain the power grid frequency deviation based on the difference between the preset rated frequency of the power grid and the effective frequency; if the power grid frequency deviation is not within the preset frequency dead zone, generate a single frequency regulation output command based on the power grid frequency deviation; obtain an automatic generation control load command and identify command conflicts between the single frequency regulation output command and the automatic generation control load command; when a conflict is identified between the automatic generation control load command and the single frequency regulation output command, generate a turbine main control command based on the single frequency regulation output command and the automatic generation control load command, and adjust the turbine main control command based on the load change in the automatic generation control load command; drive the turbine main control based on the adjusted turbine main control command.

[0024] In this embodiment, for ease of description, the steam turbine control system in a thermal power unit will be used as the main execution subject in the following description.

[0025] To address the technical challenge of ensuring the effectiveness of a single frequency regulation output action by the turbine main control system, this application provides a solution that eliminates the superimposed offsetting effect of the automatic generation control load change in reverse regulation on the single frequency regulation output command. This solves the technical problem of ensuring the effectiveness of the single frequency regulation output action by the turbine main control system and achieves the technical effect of ensuring that the turbine main control system fully executes the output command according to the theoretical demand value of the single frequency regulation during the single frequency regulation action.

[0026] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device capable of performing the above functions, such as a steam turbine control system in a thermal power unit. The following description uses a steam turbine control system in a thermal power unit as an example to illustrate this embodiment and the subsequent embodiments.

[0027] Based on the above, this application provides a steam turbine control method for thermal power units, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the steam turbine control method for thermal power units in this application.

[0028] In this embodiment, the turbine control method in the thermal power unit includes steps S10 to S70: Step S10: Obtain the unit's equivalent frequency and the measured frequency of the power grid bus; It should be noted that the power grid bus is the common connection node between the thermal power unit and the power system. The thermal power unit feeds its output electrical energy into the power grid through the common connection node. The unit's equivalent frequency refers to the electrical frequency value obtained by converting the real-time mechanical speed of the turbine shaft according to the pole-logarithmic relationship. In this embodiment, the unit's equivalent frequency can be obtained by collecting the real-time speed of the turbine shaft from the local speed probe, dividing it by the rated speed, and then multiplying it by the rated power grid frequency. This frequency reflects the electrical frequency corresponding to the current actual rotational speed of the turbine rotor.

[0029] The measured frequency of the power grid bus refers to the actual operating frequency of the power grid obtained directly from the secondary side of the generator outlet voltage transformer or the secondary side of the power grid bus voltage transformer through an external frequency acquisition device.

[0030] It should be understood that by synchronously acquiring two independent frequency signals, step S10 can provide backup input from another signal source when a single frequency signal source experiences signal distortion or loss due to sensor failure, signal cable breakage, or electromagnetic interference. This avoids the failure of a single frequency signal to enable the frequency modulation function, thereby improving the reliability of the single frequency modulation input signal.

[0031] In one feasible implementation, step S10 may include steps S11-S12: Step S11: Obtain the measured frequency of the power grid bus output by the external frequency acquisition device and the real-time speed of the turbine shaft acquired by the local turbine speed probe; convert the real-time speed of the turbine shaft to obtain the unit's equivalent frequency.

[0032] An external frequency acquisition device refers to a frequency measurement device that is independently installed at the generator set outlet or the power grid bus side. This device is connected to the electrical secondary circuit through a voltage transformer, isolates and transforms the high voltage signal into a low voltage analog signal, performs zero-crossing detection or phase-locked loop calculation, and outputs a digital or analog signal that reflects the actual operating frequency of the power grid.

[0033] A turbine local speed probe is a non-contact sensor installed near the turbine shaft. This probe usually uses the principles of eddy current effect or magnetoresistive effect to detect the rotational pulse signal of gears or gear discs on the shaft.

[0034] The real-time rotational speed of the turbine shaft refers to the actual number of rotations per minute of the turbine rotor during operation, measured in revolutions per minute (r / min).

[0035] It is understandable that the pulse frequency output by the turbine local speed probe is proportional to the shaft speed, and the real-time speed value can be calculated by measuring the number of pulses per unit time.

[0036] Step S12: Convert the real-time rotational speed of the turbine shaft to obtain the unit's equivalent frequency.

[0037] The real-time rotational speed of the turbine shaft refers to the actual rotational speed of the turbine rotor at the current moment, measured in revolutions per minute (r / min).

[0038] The equivalent frequency of a generator unit refers to the electrical frequency value obtained by converting the real-time mechanical speed of the turbine shaft according to the pole-pair relationship of the generator unit, and the unit is Hertz (Hz).

[0039] It is understandable that for a steam turbine generator set operating in grid connection, there is a fixed proportional relationship between the rotor speed and the output electrical frequency. That is, the electrical frequency is equal to the rotor speed divided by the rated speed and then multiplied by the rated grid frequency. Therefore, the equivalent frequency of the unit can be obtained by substituting the collected real-time speed value into this proportional relationship.

[0040] Step S20: Filter the measured frequency of the power grid bus and the equivalent frequency of the generating unit to obtain the effective frequency; It should be noted that the effective frequency refers to the frequency value selected from the two redundant frequency signals and deemed accurate and reliable by quality judgment. This value serves as the input reference for subsequent single frequency modulation command calculations.

[0041] It should be understood that since the two frequency signals may deviate under certain operating conditions or one of them may be distorted, performing step S20 to optimize and distinguish the two signals can avoid introducing abnormal frequency values ​​into the single frequency modulation calculation loop, thereby improving the calculation accuracy of the single frequency modulation control command.

[0042] In one feasible implementation, step S20 may include steps S21 to S25: Step S21: Based on the measured frequency of the power grid bus and the equivalent frequency of the generating unit, obtain the real-time deviation value; The real-time deviation value refers to the numerical difference between the measured frequency of the power grid bus and the equivalent frequency of the generating unit at the same time.

[0043] Understandably, the real-time deviation value obtained by subtracting the two signals is used to determine whether the two frequency signals are consistent; the smaller the deviation value, the higher the reliability of the two signals.

[0044] Step S22: When the real-time deviation value is less than or equal to the preset deviation threshold, the unit's equivalent frequency is taken as the effective frequency. The preset deviation threshold refers to the maximum allowable deviation between two frequency signals. This threshold is usually set to 0.03Hz and is used to determine whether the two signals are in a consistent state.

[0045] The effective frequency refers to the frequency value selected as the input reference for a single frequency modulation.

[0046] Understandably, when the deviation between the two frequency signals is within the allowable range, it means that both signals are in normal working condition. In this case, the unit equivalent frequency, which directly reflects the unit's rotational speed, is selected as the effective frequency, as this signal has a faster dynamic response speed.

[0047] Step S23: When the real-time deviation value is greater than the preset deviation threshold, the equivalent frequency of the unit is inspected to obtain the inspection result. Quality inspection refers to the process of judging the quality of the unit's equivalent frequency signal, which includes a comprehensive evaluation of the signal's rate of change, amplitude range, and continuity.

[0048] The inspection result refers to the signal quality judgment conclusion output after the quality inspection is completed, including two states: inspection passed and inspection failed.

[0049] It is understandable that when the deviation between two signals exceeds the allowable range, it indicates that at least one signal is abnormal. In this case, the quality of the two signals needs to be judged separately to determine the source of the fault signal.

[0050] Step S24: When the inspection result is "inspection passed", the unit's equivalent frequency is taken as the effective frequency. Passing the inspection means that the equivalent frequency signal of the unit has been confirmed by quality judgment to have a rate of change that does not exceed the limit, an amplitude that is within the normal range, and a continuous signal without jumps.

[0051] The effective frequency refers to the frequency value selected as the input reference for a single frequency modulation.

[0052] Understandably, when the equivalent frequency signal quality of the unit is qualified, even if there is a deviation between the two signals, the faster-responding local speed signal will be used first to ensure the fast response characteristics of a single frequency adjustment.

[0053] Step S25: If the test result is that the test fails, the measured frequency of the power grid bus shall be taken as the effective frequency.

[0054] The inspection failed because the equivalent frequency signal of the unit was confirmed to have abnormalities such as excessively fast rate of change, excessive amplitude, or signal interruption after quality judgment.

[0055] The measured frequency of the power grid bus refers to the frequency signal obtained from the power grid bus side through an external frequency acquisition device. This signal is not affected by the failure of the turbine body sensor.

[0056] Understandably, when the equivalent frequency signal quality of the generator unit is unqualified, it automatically and seamlessly switches to the measured frequency of the power grid bus as the effective frequency to ensure that the frequency input signal of a single frequency modulation is not interrupted.

[0057] Step S30: Based on the preset rated frequency and effective frequency of the power grid, obtain the power grid frequency deviation; It should be noted that the preset grid rated frequency refers to the standard operating frequency specified by the power system, which is 50 Hz in the Chinese power grid. Grid frequency deviation refers to the difference between the effective frequency and the preset grid rated frequency.

[0058] It should be understood that since the triggering conditions and output of a single frequency regulation depend on the degree of deviation of the grid frequency from the rated value, calculating the grid frequency deviation in step S30 can provide a basis for judging whether to engage a single frequency regulation and calculating the required adjustment amount.

[0059] In one feasible implementation, steps S30 may be followed by steps S31 to S33: S31, during the process of driving the main control of the steam turbine, return to execute the step of obtaining the equivalent frequency of the unit and the measured frequency of the grid bus to obtain the grid frequency deviation; The main control of the turbine drive system refers to the process of sending command signals to the turbine speed control system to control the opening of the turbine control valve to change the unit's output power.

[0060] Understandably, during normal operation of the unit, frequency signal acquisition and frequency deviation calculation need to be continuously and cyclically executed in order to monitor changes in grid frequency in real time and ensure that the single frequency regulation function can be put into operation immediately when needed.

[0061] S32: When the grid frequency deviation is within the preset frequency dead zone range, an automatic generation control load command is obtained. The preset frequency dead zone range refers to the pre-set frequency deviation range. Within this range, the frequency adjustment function will not operate to avoid excessive adjustment. It is usually set to ±0.033 Hz.

[0062] Automatic generation control load command refers to the remote power setpoint issued by the power grid dispatch center to the generator unit through the dispatch automation system. This command includes the target load value.

[0063] It is understandable that when the grid frequency deviation is within the dead zone, it means that the degree of frequency deviation is still within the allowable non-operation range of regulation. At this time, there is no need to engage in single frequency regulation, and the unit only needs to follow the AGC load command.

[0064] S33 generates turbine main control commands based on automatic generation control load commands to drive turbine main control.

[0065] Automatic generation control load command refers to the target power value issued by the power grid dispatch center to the generating unit.

[0066] The main control command of the steam turbine refers to the comprehensive control signal that is ultimately output to the steam turbine speed control system.

[0067] Understandably, when there is no need for a single frequency regulation operation, the turbine main control command is equal to the AGC load command, and the unit operates according to the dispatch setting value.

[0068] Step S40: When the grid frequency deviation is not within the preset frequency dead zone range, generate a single frequency regulation output command based on the grid frequency deviation.

[0069] It should be noted that a single frequency regulation output command refers to a power regulation command calculated according to a preset speed inequality function when the grid frequency deviates from the rated value beyond the dead zone, used to correct the unit output to suppress the frequency deviation.

[0070] It should be understood that since the magnitude of the power grid frequency deviation directly determines the amplitude of the required frequency regulation output, step S40 calculates the single frequency regulation output command based on the specific value of the frequency deviation, which can achieve precise adjustment so that the frequency regulation output is greater when the frequency deviation is greater.

[0071] In one feasible implementation, step S40 may include steps S41 to S43: Step S41: When the grid frequency deviation is not within the preset frequency dead zone range, obtain the preset speed unequal rate and rated power of the unit. The preset speed unequal rate of the unit refers to the slope parameter of the static characteristic curve of the turbine speed control system. It represents the percentage change in unit power corresponding to a 1% change in frequency. This value is usually set to 4%~5%.

[0072] The rated power of a generator set refers to the maximum power that the generator set can continuously output under rated operating conditions. This value is determined by the design parameters of the turbine and the generator.

[0073] Understandably, the speed variability and rated power are two core parameters for calculating a single frequency modulation output command. The former determines the frequency modulation response sensitivity, while the latter determines the baseline magnitude of the frequency modulation output.

[0074] Step S42: Based on the preset grid rated frequency, the preset unit speed unequal rate, the unit rated power and the grid frequency deviation, the target power of the unit is obtained; The preset grid rated frequency refers to the standard operating frequency value specified by the power system.

[0075] The unit's preset speed unequal rate is a setting parameter of the governor's static characteristic curve.

[0076] The rated power of a generator set is its maximum continuous output power as designed.

[0077] The power grid frequency deviation is the difference between the effective frequency and the rated frequency.

[0078] The target power of the unit refers to the theoretical output value that the unit needs to achieve, calculated according to the formula for single frequency regulation. The formula for single frequency regulation is:

[0079] In the formula, This represents the target power of the unit corresponding to the effective frequency f. This indicates the power grid frequency deviation, which is the difference between the effective frequency and the preset rated power grid frequency. Indicates the preset rated frequency of the power grid. Indicates the preset speed variability of the generator set. This indicates the rated power of the generator unit.

[0080] Understandably, by substituting the above parameters into the single frequency regulation calculation formula, the target power value that the unit should achieve after a single frequency regulation action can be obtained.

[0081] Step S43: Generate a single frequency regulation output command based on the unit's target power.

[0082] The target power of the unit refers to the theoretical output value of the unit calculated based on the frequency deviation.

[0083] A single frequency modulation output command refers to a power increment adjustment signal generated by comparing the target power of the unit with the current actual power.

[0084] It is understandable that a single frequency regulation output command is essentially the difference between the target power and the current power, and this difference is the amount of adjustment that the unit needs to increase or decrease.

[0085] Step S50: Obtain the automatic generation control load command and identify command conflicts between the single frequency regulation output command and the automatic generation control load command.

[0086] It should be noted that the automatic generation control load command refers to the target load value of the generating units issued by the power grid dispatch center.

[0087] Command conflict identification refers to the process of determining whether the power adjustment direction required by a single frequency regulation output command is opposite to the adjustment direction of the automatic generation control load command.

[0088] Understandably, by comparing the output commands of the two systems, it is possible to determine whether there is a reverse adjustment conflict, providing a basis for decision-making on whether to perform conflict handling subsequently.

[0089] It should be understood that since the direction of a single frequency modulation output command depends on the sign of the frequency deviation, while the direction of an AGC load command depends on the difference between the load setpoint issued by the dispatcher and the current value, and the two are generated by completely independent control logic, performing step S50 to identify the conflict between the two commands can promptly detect reverse adjustment conditions, thereby preventing the AGC command from canceling the single frequency modulation output.

[0090] Step S60: When a conflict is detected between the automatic generation control load command and the single frequency regulation output command, a turbine main control command is generated based on the single frequency regulation output command and the automatic generation control load command, and the turbine main control command is adjusted based on the load change in the automatic generation control load command.

[0091] It should be noted that conflict refers to a situation where the adjustment direction of the automatic generation control load command is opposite to the adjustment direction of the single frequency regulation output command.

[0092] Load change refers to the change in the automatic generation control load command within the current control cycle relative to the previous control cycle.

[0093] Understandably, in the event of command conflicts, deducting the load change from the turbine main control command in the automatic generation control load command can eliminate the superimposed impact of the change on the single frequency regulation output command, so that the command finally output to the turbine main control only contains the output demand for a single frequency regulation.

[0094] It should be understood that, since only the dynamic changes of the AGC command are deducted while the basic load setting of the AGC is retained, step S60 can isolate the reverse regulation interference of the AGC during a single frequency regulation operation while maintaining the unit load from deviating significantly from the dispatch setting.

[0095] Step S70: Drive the turbine main control based on the adjusted turbine main control command.

[0096] It should be noted that the adjusted turbine main control command refers to the final output command formed after deducting the AGC reverse load change.

[0097] The main control of the steam turbine refers to the speed control system of the steam turbine. After receiving instructions, it controls the hydraulic servo valve to change the opening of the regulating valve, thereby adjusting the steam flow and changing the unit output.

[0098] Understandably, the adjusted turbine main control command eliminates the offsetting effect of the reverse AGC change, and the change in unit output after driving the turbine main control is completely equal to the adjustment amount required by the single frequency regulation output command.

[0099] It should be understood that since the interference of reverse AGC change has been removed from the final output command to the turbine main control, step S70 enables the turbine main control to fully execute the output adjustment according to the theoretical demand value of a single frequency regulation.

[0100] This embodiment provides a steam turbine control method for thermal power units, which involves acquiring the unit's equivalent frequency and the measured frequency of the power grid bus; filtering the measured frequency of the power grid bus and the unit's equivalent frequency to obtain the effective frequency; obtaining the power grid frequency deviation based on the preset rated frequency and effective frequency of the power grid; generating a single-cycle frequency regulation output command based on the power grid frequency deviation when the power grid frequency deviation is not within the preset frequency dead zone; acquiring the automatic generation control load command and identifying command conflicts between the single-cycle frequency regulation output command and the automatic generation control load command; and identifying conflicts between the automatic generation control load command and the single-cycle frequency regulation command. When output commands conflict, a turbine main control command is generated based on the single-frequency regulation output command and the automatic generation control load command. The turbine main control command is then adjusted based on the load change in the automatic generation control load command. This technical means of driving the turbine main control based on the adjusted turbine main control command eliminates the superimposed cancellation effect of the reverse-regulated automatic generation control load change on the single-frequency regulation output command. This solves the technical problem of how to ensure the effectiveness of the single-frequency regulation output action of the turbine main control, and achieves the technical effect that the turbine main control fully executes the output command according to the theoretical demand value of the single-frequency regulation during the single-frequency regulation action.

[0101] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 2 Step S50 of the steam turbine control method in a thermal power unit also includes steps S51 to S55: Step S51: Obtain the automatic generation control load command and parse the automatic generation control load command to obtain the load change. It should be noted that the automatic generation control load command refers to the target load value of the generating units issued by the power grid dispatch center.

[0102] The load change refers to the difference between the AGC load command value obtained at the current moment and the AGC load command value obtained at the previous control cycle. This difference reflects the adjustment range and direction of the AGC command within the current cycle.

[0103] It is understandable that by calculating the difference between the AGC load commands of two consecutive control cycles, the dynamic change of the AGC command can be obtained. This change is then used for directional comparison with a single frequency modulation output command.

[0104] Step S52: When the effective frequency is less than the preset grid rated frequency and the grid frequency deviation is negative, the power increase direction is taken as the power adjustment direction of the single frequency modulation output command. It should be noted that the power adjustment direction refers to the direction of power change required by a single frequency modulation output command.

[0105] It is understandable that when the effective frequency is less than the preset grid rated frequency, it means that the grid is currently in a low-frequency operation state. At this time, the grid frequency deviation is negative. According to the negative feedback regulation principle of single frequency regulation, the turbine generator set needs to increase its output to prevent the frequency from continuing to drop. Therefore, the direction of increasing power is taken as the power regulation direction of the single frequency regulation output command.

[0106] Step S53: When the effective frequency is greater than the preset grid rated frequency and the grid frequency deviation is positive, the power reduction direction is taken as the power adjustment direction of the single frequency modulation output command.

[0107] It is understandable that when the effective frequency is greater than the preset grid rated frequency, it means that the grid is currently operating at a high frequency. At this time, the grid frequency deviation is positive. According to the negative feedback regulation principle of single frequency regulation, the turbine generator set needs to reduce its output to prevent the frequency from continuing to rise. Therefore, the power reduction direction is taken as the power regulation direction of the single frequency regulation output command.

[0108] Step S54: Based on the magnitude of the load change, the load adjustment direction is obtained.

[0109] It should be noted that the load adjustment direction refers to the load change direction required by the AGC command. When the load change is positive, it is the direction of increasing load, and when the load change is negative, it is the direction of decreasing load.

[0110] It is understandable that when the power adjustment direction is opposite to the load adjustment direction, if the two commands are directly superimposed, the AGC change will cancel out the output of a single frequency regulation. Therefore, this operating condition needs to be identified as a command conflict to trigger subsequent processing.

[0111] Step S55: When the power regulation direction is opposite to the load regulation direction, it is determined that there is a command conflict between the single frequency regulation output command and the automatic generation control load command.

[0112] It should be noted that the opposite direction of power regulation and load regulation refers to a situation where a single frequency regulation output command requires the unit to increase power while an AGC command requires the unit to reduce load, or a single frequency regulation output command requires the unit to reduce power while an AGC command requires the unit to increase load. Command conflict refers to the operating condition where two control systems output regulation commands in opposite directions at the same time.

[0113] It is understandable that when the power adjustment direction is opposite to the load adjustment direction, if the two commands are directly superimposed, the AGC change will cancel out the output of a single frequency regulation. Therefore, this operating condition needs to be identified as a command conflict to trigger subsequent processing.

[0114] It should be understood that since the single frequency regulation output command is determined by the grid frequency deviation and the AGC command is determined by the dispatch economic dispatch strategy, the two are generated by different reasons and control physical quantities. Therefore, by comparing the two regulation directions in step S55, the conflicting conditions that require the activation of priority protection can be accurately identified, thereby avoiding the interference of the reverse AGC command with the normal operation of the single frequency regulation.

[0115] In one feasible implementation, the method further includes steps S551-S552: Step S551: When the power regulation direction is consistent with the load regulation direction, determine that there is no command conflict between the single frequency regulation output command and the automatic generation control load command. The direction of power regulation is consistent with the direction of load regulation, which means that when a single frequency regulation output command requires an increase in power, the AGC command also requires an increase in load, or when a single frequency regulation output command requires a decrease in power, the AGC command also requires a decrease in load.

[0116] The absence of command conflict means that the two control systems have the same adjustment direction. In this case, the two commands can be superimposed normally without canceling each other out.

[0117] It is understandable that when the two commands adjust in the same direction, they both point to the same direction of power change. When superimposed, they only result in the unit increasing the adjustment amount in that direction. There is no problem of mutual cancellation, so there is no need to execute conflict handling logic.

[0118] Step S552: When it is determined that there is no command conflict between the single frequency regulation output command and the automatic generation control load command, a turbine main control command is generated based on the single frequency regulation output command and the automatic generation control load command to drive the turbine main control.

[0119] The single frequency modulation output command is a power regulation signal calculated based on the grid frequency deviation.

[0120] Automatic generation control load commands are the target load values ​​for generating units issued by the power grid dispatch center.

[0121] The main control command of the steam turbine refers to the comprehensive control signal that is ultimately output to the steam turbine speed control system.

[0122] Understandably, when there is no command conflict, the single frequency regulation output command and the AGC load command are directly superimposed and used as the main control command output of the turbine. This satisfies the single frequency regulation response requirements and simultaneously tracks the AGC load dispatch command.

[0123] This embodiment provides a turbine control method for thermal power units. It acquires automatic generation control load commands and parses these commands to obtain load changes. When the effective frequency is less than the preset grid rated frequency and the grid frequency deviation is negative, the power increase direction is used as the power adjustment direction of the single frequency regulation output command. When the effective frequency is greater than the preset grid rated frequency and the grid frequency deviation is positive, the power decrease direction is used as the power adjustment direction of the single frequency regulation output command. Based on the magnitude of the load change, the load adjustment direction is obtained. When the power adjustment direction is opposite to the load adjustment direction, it is determined that there is a conflict between the single frequency regulation output command and the automatic generation control load command. Because the logic of triggering conflict handling only when the directions are opposite after direction discrimination is adopted, the problem of erroneous triggering of interlocking when the adjustment directions are consistent, leading to unnecessary intervention of the AGC load tracking function, is avoided. This solves the technical problem of how to accurately identify whether there is a reverse conflict between the single frequency regulation command and the AGC command, thereby achieving a precise control effect of only performing interlocking operation when it is truly necessary to isolate reverse interference and maintaining normal superposition output when the directions are consistent.

[0124] For example, to help understand the implementation flow of the steam turbine control method in a thermal power unit obtained by combining this embodiment with the above-described embodiment one, please refer to... Figure 3 , Figure 3 A simplified flowchart of a steam turbine control method in a thermal power unit is provided, specifically: Two independent frequency signals are simultaneously acquired by a dual-channel frequency acquisition unit: one is the signal from the power grid frequency acquisition device, and the other is the unit equivalent frequency signal obtained by converting the real-time turbine speed into a frequency. Both frequency signals are sent to a dual-channel frequency signal optimization logic unit 2. This unit performs real-time deviation calculation and quality judgment on the two signals, selecting the effective frequency as the input benchmark for subsequent calculations. Based on this, the method calculates the power grid frequency deviation based on the preset rated power grid frequency and the effective frequency, and sends this frequency deviation to the speed inequality function calculation unit 3. When the frequency deviation exceeds the preset frequency dead zone range, it is converted by the speed inequality function (i.e., the single-frequency regulation standard calculation formula) to generate the single-frequency regulation original command 4.

[0125] While generating the original single-frequency regulation command, the method acquires the automatic generation control load command issued by the dispatch center in real time through the AGC command acquisition unit 5, and calculates the AGC load change within the current control cycle. Subsequently, the adjustment direction discrimination logic 6 compares and discriminates the power adjustment direction required by the single-frequency regulation output command with the load adjustment direction of the AGC load command. When the discrimination result is that the two adjustment directions are consistent, the conventional command superposition logic 7 is executed, and the single-frequency regulation output command and the AGC load command are directly superimposed as the turbine main control command output. When the discrimination result is that the two adjustment directions are opposite, it is determined that there is a command conflict, triggering the main control command deduction logic 8, deducting the AGC load change from the turbine main control command, eliminating the offsetting effect of the reverse AGC change on the single-frequency regulation output command, and then outputting the optimized turbine main control command 9 to drive the turbine main control.

[0126] After the turbine main control command is output, the method continuously performs frequency regulation status judgment 10, monitoring in real time whether the grid frequency has returned to the preset frequency dead zone range. When the frequency has not yet returned to the dead zone, the process returns to the dual-channel frequency acquisition unit 1 to restart the next control cycle, keeping the single frequency regulation priority logic continuously effective; when the frequency has returned to the dead zone range, it indicates that the single frequency regulation action has ended, at which point the deduction logic is canceled and the normal command superposition mode is restored. Through the cyclic execution of the above process, this method realizes the complete control logic of automatically identifying and blocking the reverse AGC load change during the entire process of a single frequency regulation action and automatically restoring normal AGC tracking after the frequency regulation ends. Among them, the dual-channel frequency signal optimization ensures the reliability of the input signal, the speed inequality function calculation ensures the accurate calculation of frequency regulation output, the direction discrimination and dynamic deduction logic eliminate the interference of AGC commands on the single frequency regulation output, and the frequency regulation status judgment ensures the smooth switching between the two control modes.

[0127] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the steam turbine control method in the thermal power unit of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0128] This application also provides a steam turbine control device for thermal power units; please refer to [reference needed]. Figure 4 The steam turbine control device in the thermal power unit includes: Input module 10 is used to obtain the unit's equivalent frequency and the measured frequency of the power grid bus; The filtering module 20 is used to filter the measured frequency of the power grid bus and the equivalent frequency of the generating unit to obtain the effective frequency; Deviation module 30 is used to obtain the power grid frequency deviation based on the preset rated frequency and effective frequency of the power grid; The generation module 40 is used to generate a single frequency regulation output command based on the power grid frequency deviation when the power grid frequency deviation is not within the preset frequency dead zone range. The conflict module 50 is used to acquire automatic generation control load commands and identify command conflicts between single frequency regulation output commands and automatic generation control load commands. The adjustment module 60 is used to generate a turbine main control command based on the single frequency regulation output command and the automatic generation control load command when a conflict is detected between the automatic generation control load command and the single frequency regulation output command, and to adjust the turbine main control command based on the load change in the automatic generation control load command. Output module 70 is used to drive the turbine main control based on the adjusted turbine main control instructions.

[0129] The steam turbine control device for thermal power units provided in this application, employing the steam turbine control method in the above embodiments, can solve the technical problem of ensuring the effectiveness of the single frequency regulation output action of the steam turbine main control. Compared with the prior art, the beneficial effects of the steam turbine control device for thermal power units provided in this application are the same as those of the steam turbine control method for thermal power units provided in the above embodiments, and other technical features in the steam turbine control device for thermal power units are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0130] In one embodiment, the input module 10 is also used to acquire the measured frequency of the power grid bus output by the external frequency acquisition device and the real-time speed of the turbine shaft acquired by the turbine local speed probe. The real-time rotational speed of the turbine shaft is converted to obtain the unit's equivalent frequency.

[0131] In one embodiment, the screening module 20 is also used to obtain the real-time deviation value between the measured frequency of the power grid bus and the equivalent frequency of the generating unit; When the real-time deviation value is less than or equal to the preset deviation threshold, the unit's equivalent frequency is taken as the effective frequency; When the real-time deviation value is greater than the preset deviation threshold, the equivalent frequency of the unit is inspected to obtain the inspection results; If the test result is "passed", the unit's equivalent frequency will be used as the effective frequency. If the test result is that the test fails, the measured frequency of the power grid bus shall be taken as the effective frequency.

[0132] In one embodiment, the deviation module 30 is further configured to return to the step of obtaining the equivalent frequency of the unit and the measured frequency of the power grid bus during the process of driving the main control of the steam turbine, so as to obtain the power grid frequency deviation; When the grid frequency deviation is within the preset frequency dead zone range, an automatic generation control load command is obtained; Based on the automatic generation control load command, the turbine main control command is generated to drive the turbine main control.

[0133] In one embodiment, the generation module 40 is further configured to obtain the preset speed unequal rate and rated power of the unit when the grid frequency deviation is not within the preset frequency dead zone range. The target power of the unit is obtained based on the preset grid rated frequency, the preset speed unequal rate of the unit, the rated power of the unit and the grid frequency deviation; Based on the unit's target power, a single frequency regulation output command is generated.

[0134] In one embodiment, the conflict module 50 is further configured to acquire automatic generation control load instructions and parse the automatic generation control load instructions to obtain the load change amount; When the effective frequency is less than the preset grid rated frequency and the grid frequency deviation is negative, the power increase direction will be used as the power adjustment direction of a single frequency modulation output command. When the effective frequency is greater than the preset grid rated frequency and the grid frequency deviation is positive, the power reduction direction will be used as the power adjustment direction of a single frequency modulation output command. The direction of load adjustment is determined based on the magnitude of the load change. When the power regulation direction is opposite to the load regulation direction, it is determined that there is a command conflict between the single frequency regulation output command and the automatic generation control load command.

[0135] In one embodiment, the output module 70 is further configured to determine that there is no command conflict between the single frequency modulation output command and the automatic generation control load command when the power adjustment direction is consistent with the load adjustment direction; When it is determined that there is no conflict between the single frequency regulation output command and the automatic generation control load command, the turbine main control command is generated based on the single frequency regulation output command and the automatic generation control load command to drive the turbine main control.

[0136] This application provides a steam turbine control device for a thermal power unit, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the steam turbine control method for a thermal power unit as described in Embodiment 1 above.

[0137] refer to Figure 5A schematic diagram of the structure of a steam turbine control device suitable for implementing the embodiments of this application is shown. The steam turbine control device in the thermal power unit in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), tablets, PMPs (Portable Media Players), vehicle terminals (e.g., vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 5 The turbine control equipment shown in the thermal power unit is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0138] like Figure 5 As shown, the turbine control equipment in a thermal power unit may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to programs stored in read-only memory (ROM) 1002 or programs loaded from storage device 1003 into random access memory (RAM) 1004. RAM 1004 also stores various programs and data required for the operation of the turbine control equipment in the thermal power unit. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via bus 1005. Input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to I / O interface 1006: input devices 1007 including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices 1008 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 1003 including, for example, magnetic tapes, hard disks, etc.; and communication devices 1009. Communication device 1009 allows the turbine control equipment in a thermal power unit to exchange data with other devices wirelessly or via wired communication. Although the figure shows turbine control equipment in a thermal power unit with various systems, it should be understood that it is not required to implement or possess all the systems shown. More or fewer systems may be implemented or possessed alternatively.

[0139] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0140] The steam turbine control equipment for thermal power units provided in this application, employing the steam turbine control method in the above embodiments, can solve the technical problem of ensuring the effectiveness of single frequency regulation output action of the main control of the steam turbine. Compared with the prior art, the beneficial effects of the steam turbine control equipment for thermal power units provided in this application are the same as those of the steam turbine control method for thermal power units provided in the above embodiments, and other technical features of the steam turbine control equipment for thermal power units are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0141] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0142] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0143] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, which can be used to execute the steam turbine control method in the thermal power unit described in the above embodiments.

[0144] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), or any suitable combination thereof.

[0145] The aforementioned computer-readable storage medium may be included in the turbine control equipment of a thermal power unit; or it may exist independently and not be assembled into the turbine control equipment of a thermal power unit.

[0146] The aforementioned computer-readable storage medium carries one or more programs. When these programs are executed by the turbine control equipment in a thermal power unit, the turbine control equipment in the thermal power unit causes the following: it acquires the unit's equivalent frequency and the measured frequency of the power grid bus; it filters the measured frequency of the power grid bus and the unit's equivalent frequency to obtain an effective frequency; it obtains the power grid frequency deviation based on the difference between the preset rated power grid frequency and the effective frequency; when the power grid frequency deviation is not within the preset frequency dead zone, it generates a single-cycle frequency regulation output command based on the power grid frequency deviation; it acquires an automatic generation control load command and performs command conflict identification between the single-cycle frequency regulation output command and the automatic generation control load command; when a conflict is identified between the automatic generation control load command and the single-cycle frequency regulation output command, it generates a turbine main control command based on the single-cycle frequency regulation output command and the automatic generation control load command, and adjusts the turbine main control command based on the load change in the automatic generation control load command; and it drives the turbine main control based on the adjusted turbine main control command.

[0147] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0148] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation that may be implemented in systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0149] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0150] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., computer programs) for executing the turbine control method in the above-described thermal power unit, thereby solving the technical problem of how to ensure the effectiveness of a single frequency regulation output action of the turbine main control. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as the beneficial effects of the turbine control method in the thermal power unit provided in the above embodiments, and will not be repeated here.

[0151] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the steam turbine control method in a thermal power unit as described above.

[0152] The computer program product provided in this application solves the technical problem of ensuring the effectiveness of a single frequency regulation output action of the steam turbine main control system. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the steam turbine control method in the thermal power unit provided in the above embodiments, and will not be repeated here.

[0153] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A steam turbine control method for a thermal power unit, characterized in that, The method includes: Obtain the equivalent frequency of the generating unit and the measured frequency of the power grid bus; The effective frequency is obtained by filtering the measured frequency of the power grid bus and the equivalent frequency of the generating unit; The power grid frequency deviation is obtained based on the difference between the preset rated power grid frequency and the effective frequency. If the power grid frequency deviation is not within the preset frequency dead zone range, a single frequency modulation output command is generated based on the power grid frequency deviation. Obtain automatic power generation control load instructions and identify command conflicts between the single frequency regulation output instructions and the automatic power generation control load instructions; When a conflict is detected between the automatic generation control load command and the single frequency regulation output command, a turbine main control command is generated based on the single frequency regulation output command and the automatic generation control load command, and the turbine main control command is adjusted based on the load change in the automatic generation control load command. The turbine main control is driven by the adjusted turbine main control commands.

2. The method as described in claim 1, characterized in that, The process of filtering the measured frequency of the power grid bus and the equivalent frequency of the generating unit to obtain the effective frequency includes: The real-time deviation value is obtained based on the measured frequency of the power grid bus and the equivalent frequency of the generating unit; When the real-time deviation value is less than or equal to the preset deviation threshold, the unit's equivalent frequency is taken as the effective frequency; When the real-time deviation value is greater than the preset deviation threshold, the equivalent frequency of the unit is subjected to quality inspection to obtain the inspection result; When the test result is "passed", the equivalent frequency of the unit is taken as the effective frequency. If the test result is that the test fails, the measured frequency of the power grid bus shall be taken as the effective frequency.

3. The method as described in claim 1, characterized in that, When the grid frequency deviation is not within the preset frequency dead zone, generating a single frequency modulation output command based on the grid frequency deviation includes: When the grid frequency deviation is not within the preset frequency dead zone range, the preset speed unequal rate and rated power of the unit are obtained; The target power of the unit is obtained based on the preset grid rated frequency, the preset unit speed unequal rate, the unit rated power and the grid frequency deviation; Based on the target power of the unit, a single frequency regulation output command is generated.

4. The method as described in claim 1, characterized in that, The step of acquiring the automatic generation control load command and identifying command conflicts between the single frequency regulation output command and the automatic generation control load command includes: Obtain the automatic generation control load command and parse the automatic generation control load command to obtain the load change. When the effective frequency is less than the preset grid rated frequency and the grid frequency deviation is negative, the power increase direction is taken as the power adjustment direction of the single frequency modulation output command; When the effective frequency is greater than the preset grid rated frequency and the grid frequency deviation is positive, the power reduction direction is taken as the power adjustment direction of the single frequency modulation output command; The direction of load adjustment is determined based on the magnitude of the load change. When the power adjustment direction is opposite to the load adjustment direction, it is determined that there is a command conflict between the single frequency regulation output command and the automatic generation control load command.

5. The method as described in claim 4, characterized in that, The method further includes: When the power adjustment direction is consistent with the load adjustment direction, it is determined that there is no command conflict between the single frequency regulation output command and the automatic generation control load command; When it is determined that there is no command conflict between the single frequency regulation output command and the automatic generation control load command, a turbine main control command is generated based on the single frequency regulation output command and the automatic generation control load command to drive the turbine main control.

6. The method according to any one of claims 1 to 5, characterized in that, After obtaining the power grid frequency deviation based on the difference between the preset rated power grid frequency and the effective frequency, the method further includes: During the process of driving the main control of the steam turbine, the step of obtaining the equivalent frequency of the unit and the measured frequency of the power grid bus is returned to execute to obtain the power grid frequency deviation. When the grid frequency deviation is within the preset frequency dead zone range, an automatic generation control load command is obtained; Based on the automatic power generation control load command, a turbine main control command is generated to drive the turbine main control.

7. The method according to any one of claims 1 to 5, characterized in that, The acquisition of the unit's equivalent frequency and the measured frequency of the power grid bus includes: The measured frequency of the power grid bus output by the external frequency acquisition device and the real-time speed of the turbine shaft are acquired by the local turbine speed probe. The real-time rotational speed of the turbine shaft is converted to obtain the unit's equivalent frequency.

8. A steam turbine control device for a thermal power unit, characterized in that, The device includes: The input module is used to obtain the unit's equivalent frequency and the measured frequency of the power grid bus. The filtering module is used to filter the measured frequency of the power grid bus and the equivalent frequency of the generating unit to obtain the effective frequency; The deviation module is used to obtain the power grid frequency deviation based on the difference between the preset rated power grid frequency and the effective frequency. The generation module is used to generate a single frequency regulation output command based on the power grid frequency deviation when the power grid frequency deviation is not within the preset frequency dead zone range. The conflict module is used to acquire automatic generation control load commands and identify command conflicts between the single frequency regulation output command and the automatic generation control load command. The adjustment module is used to generate a turbine main control command based on the automatic generation control load command and the single frequency regulation output command when a conflict is detected between the automatic generation control load command and the single frequency regulation output command, and to adjust the turbine main control command based on the load change in the automatic generation control load command. The output module is used to drive the turbine main control based on the adjusted turbine main control instructions.

9. A steam turbine control device for a thermal power unit, characterized in that, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the steam turbine control method in a thermal power unit as described in any one of claims 1 to 6.

10. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the steam turbine control method in a thermal power unit as described in any one of claims 1 to 6.

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