Method and device for diagnosing frequency oscillation of a hydro-turbine governor

Abstract

The present disclosure provides a frequency oscillation diagnosis method and device for a water turbine governor, the method comprising: obtaining monitoring data of the water turbine governor, wherein the monitoring data comprises: a residual voltage frequency value of the governor, a governor gear disc frequency value, a governor power sampling value, a governor power given value and a main pressure distributing valve core displacement value; and determining a frequency oscillation diagnosis result of the water turbine governor according to the monitoring data. By implementing the method of the present disclosure, the artificial cost can be effectively reduced, and the frequency oscillation source of the governor can be accurately and automatically diagnosed, thereby effectively improving the automation level of the equipment.

Description

Technical Field

[0001] This disclosure relates to the technical field of hydropower station governor control system, specifically to a method and apparatus for diagnosing frequency oscillations in a turbine governor. Background Technology

[0002] The turbine governor is a very important automatic regulating device for a turbine. Its function is to control the turbine's flow rate by controlling the opening of the turbine's guide vanes, thereby maintaining the turbine at 100% of its rated speed, i.e., keeping the governor frequency constant at 50Hz.

[0003] In related technologies, the hydropower industry generally uses monitoring systems and manual analysis and comprehensive judgment based on data collected by the speed governor to determine the frequency oscillation of the speed governor.

[0004] This approach is inefficient, requires high labor costs, and cannot accurately identify the corresponding frequency oscillation source. Summary of the Invention

[0005] This disclosure aims to at least partially address one of the technical problems in the related art.

[0006] Therefore, the purpose of this disclosure is to propose a method, device, computer equipment and storage medium for diagnosing the frequency oscillation of a turbine governor, which can effectively reduce labor costs and accurately and automatically diagnose the frequency oscillation source of the governor, thereby effectively improving the automation level of the equipment.

[0007] To achieve the above objectives, the frequency oscillation diagnosis method for a turbine governor proposed in the first aspect of this disclosure includes:

[0008] Acquire monitoring data of the turbine governor, wherein the monitoring data includes: governor residual pressure frequency measurement value, governor gear frequency measurement value, governor power sampling value, governor power setpoint value and main pressure distribution valve core displacement value;

[0009] Based on the monitoring data, the frequency oscillation diagnosis result of the turbine governor is determined.

[0010] To achieve the above objectives, the frequency oscillation diagnostic device for a turbine governor provided in the second aspect of this disclosure includes:

[0011] The acquisition module is used to acquire monitoring data of the turbine governor, wherein the monitoring data includes: governor residual pressure frequency measurement value, governor gear frequency measurement value, governor power sampling value, governor power setpoint value, and main pressure distribution valve core displacement value.

[0012] The determination module is used to determine the frequency oscillation diagnosis result of the turbine governor based on the monitoring data.

[0013] The computer device proposed in the third aspect of this disclosure includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the frequency oscillation diagnosis method for a water turbine governor as proposed in the first aspect of this disclosure.

[0014] The fourth aspect of this disclosure provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a frequency oscillation diagnosis method for a water turbine governor as proposed in the first aspect of this disclosure.

[0015] The fifth aspect of this disclosure provides a computer program product that, when executed by a processor, performs a frequency oscillation diagnosis method for a turbine governor as described in the first aspect of this disclosure.

[0016] The frequency oscillation diagnosis method, apparatus, computer equipment, and storage medium for turbine governors disclosed herein acquire monitoring data of the turbine governor, including: governor residual pressure frequency measurement value, governor gear frequency measurement value, governor power sampling value, governor power setpoint value, and main pressure distribution valve core displacement value. Based on the monitoring data, the frequency oscillation diagnosis result of the turbine governor is determined. This effectively reduces labor costs and accurately and automatically diagnoses the frequency oscillation source of the governor, thus effectively improving the automation level of the equipment.

[0017] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 This is a schematic flowchart of a frequency oscillation diagnosis method for a water turbine governor according to an embodiment of this disclosure;

[0020] Figure 2 This is a schematic flowchart of a frequency oscillation diagnosis method for a water turbine governor according to another embodiment of this disclosure;

[0021] Figure 3 This is a schematic diagram of the structure of a frequency oscillation diagnostic device for a water turbine governor according to an embodiment of this disclosure;

[0022] Figure 4 A block diagram of an exemplary computer device suitable for implementing embodiments of the present disclosure is shown. Detailed Implementation

[0023] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are used only to explain this disclosure, and should not be construed as limiting this disclosure. Rather, embodiments of this disclosure include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0024] Figure 1 This is a schematic flowchart of a frequency oscillation diagnosis method for a turbine governor proposed in one embodiment of this disclosure.

[0025] It should be noted that the execution subject of the frequency oscillation diagnosis method of the turbine governor in this embodiment is the frequency oscillation diagnosis device of the turbine governor. This device can be implemented by software and / or hardware. The device can be configured in a computer device, which may include, but is not limited to, a terminal, a server, etc. For example, the terminal may be a mobile phone, a handheld computer, etc.

[0026] like Figure 1 As shown, the frequency oscillation diagnosis method for the turbine governor includes:

[0027] S101: Acquire monitoring data of the turbine governor, including: governor residual pressure frequency measurement value, governor gear frequency measurement value, governor power sampling value, governor power setpoint value, and main pressure regulating valve core displacement value.

[0028] Among them, monitoring data can refer to the data obtained by monitoring the status of different dimensions during the operation of the turbine governor.

[0029] Residual pressure frequency measurement is a method for estimating rotor speed by detecting residual pressure pulsations in the hydraulic system of a speed governor. Typically, the hydraulic system of a speed governor generates certain pulsating pressure during operation, and this pulsation is related to the rotor speed. By measuring the frequency of this residual pressure, rotor speed information can be indirectly obtained. Residual pressure frequency measurement is a simple and effective speed monitoring method, particularly suitable for equipment where direct contact with the rotor is not possible.

[0030] Gear frequency measurement is a method of measuring rotor speed by utilizing the number of teeth and rotational frequency of a gear or gear disk. By detecting the number of teeth passing per second on the gear or gear disk and converting this into a frequency signal, the rotor's speed information can be obtained. This method typically requires the installation of sensors to detect the rotation of the gear disk and the processing of the signal to obtain the speed information. Gear frequency measurement is generally used in applications requiring high speed accuracy, providing relatively precise speed data.

[0031] The power sampling value of the speed governor refers to the actual power value collected from the output terminal of the motor or generator. By monitoring the output power of the motor or generator, the speed governor can control and regulate it to meet specific power demands. The power sampling value is typically a power value obtained from data such as current and voltage acquired by sensors or measuring devices, and then calculated or processed.

[0032] The power setpoint of the speed governor refers to the desired power value set by the speed governor system according to needs. When the speed governor system is working, based on the set power requirements, the speed governor compares the power setpoint with the actual power sample value, and then adjusts the speed of the motor or generator through a corresponding feedback control strategy so that the actual power gradually approaches the setpoint.

[0033] The displacement value of the main pressure regulating valve core refers to the offset of the main pressure regulating valve core relative to its zero position, which is one of the important parameters of the governor's working status.

[0034] In this embodiment of the disclosure, when the frequency measurement values ​​of the governor residual pressure, the frequency measurement values ​​of the governor gear disk, the power sampling value of the governor, the power setpoint of the governor, and the displacement value of the main pressure regulating valve core are obtained as monitoring data, reliable data support in multiple dimensions can be provided for the subsequent determination of the frequency oscillation diagnosis results of the turbine governor.

[0035] S102: Determine the frequency oscillation diagnosis result of the turbine governor based on the monitoring data.

[0036] Among them, the frequency oscillation diagnosis results can be used to indicate whether the turbine governor is experiencing frequency oscillation, and the corresponding oscillation source.

[0037] In this embodiment of the disclosure, when determining the frequency oscillation diagnosis result of the turbine governor based on monitoring data, the monitoring data can be processed based on a pre-trained machine learning model to obtain the corresponding frequency oscillation diagnosis result. Alternatively, it can be based on a preset relationship table containing frequency oscillation diagnosis results corresponding to different monitoring data. Or, it can be based on any other possible method to determine the frequency oscillation diagnosis result of the turbine governor based on the monitoring data, without any limitation.

[0038] In this embodiment, by acquiring monitoring data of the turbine governor, including: governor residual pressure frequency measurement value, governor gear frequency measurement value, governor power sampling value, governor power setpoint value, and main pressure distribution valve core displacement value, the frequency oscillation diagnosis result of the turbine governor is determined based on the monitoring data. This effectively reduces labor costs and accurately and automatically diagnoses the frequency oscillation source of the governor, thus effectively improving the automation level of the equipment.

[0039] This disclosure also proposes a diagnostic method for frequency oscillation of a turbine governor, wherein the frequency value of the governor residual pressure is determined based on the following method: determining the unit speed and the number of generator pole pairs; and calculating the frequency value of the governor residual pressure based on the unit speed and the number of generator pole pairs.

[0040] In this embodiment of the disclosure, residual voltage frequency measurement is electrical frequency measurement, and the calculation formula is: f = n * p / 60, where n represents the unit speed and p represents the number of generator pole pairs.

[0041] This disclosure also proposes a diagnostic method for frequency oscillation of a turbine governor, wherein the frequency measurement value of the governor gear disc is determined based on the following method: when the unit is rotating, a pulse signal indicating the unit speed is acquired; and the frequency measurement value of the governor gear disc is determined based on the pulse signal.

[0042] In this embodiment of the disclosure, the gear plate frequency measurement is a mechanical frequency measurement. When the unit rotates, a pulse signal that reflects the unit speed is generated by a proximity switch or photoelectric sensor. Then, the unit speed is obtained by measuring the number of pulses by an intelligent instrument.

[0043] This disclosure also proposes a diagnostic method for frequency oscillation of a turbine governor, wherein the governor power sampling value is determined based on the following method: acquiring a first current signal from a governor power transmitter; determining the current signal range, the power sampling range, and the range of a first intermediate variable, wherein the process of determining the range of the first intermediate variable is related to the correction and compensation process of the governor power sampling value; calculating a first intermediate variable based on the current signal range, the first current signal, and the range of the first intermediate variable; and calculating the governor power sampling value based on the power sampling range, the first intermediate variable, and the range of the first intermediate variable.

[0044] For example, in the embodiments of this disclosure, the power sampling calculation of the speed controller can be based on the following steps:

[0045] (1) Calculation of intermediate variable for speed governor power sampling (i.e., the first intermediate variable mentioned above)

[0046] 1) Obtain the current signal (i.e. the first current signal mentioned above) Ig from the speed controller power transmitter;

[0047] 2) The range of 4 to 20 mA (current signal range) is calibrated as the range of calculated code values ​​(i.e., the range of the first intermediate variable mentioned above) αmin to αmax;

[0048] 3) Formula for calculating the intermediate variable α of the speed governor power sampling (i.e., the first intermediate variable mentioned above):

[0049] α=[(αmax-αmin)*(Ig-4) / (20-4)]+αmin

[0050] (2) Speed ​​Controller Power Sampling Calculation

[0051] 1) The calculated code value range αmin~αmax is calibrated to correspond to the speed controller power sampling range Pgmin~Pgmax;

[0052] 2) Formula for calculating the power sampling of the speed controller:

[0053] Pg=[(Pgmax-Pgmin)*(α-αmin) / (αmax-αmin)]+Pgmin

[0054] (3) Speed ​​Controller Power Sampling Compensation

[0055] For hydro-generator units, the installed capacity is pre-set at the factory, therefore the governor power sampling range Pgmin~Pgmax is not adjustable. 4~20mA is the standard value for converting non-current signals to current signals, i.e., an internationally accepted standard, and cannot be modified. Based on the above calculation formulas, it can be seen that by reasonably adjusting the intermediate variables αmin and αmax, the governor power sampling Pg can be corrected and compensated to compensate for changes caused by errors in the measurement source and signal transmission process.

[0056] This disclosure also proposes a diagnostic method for frequency oscillation of a turbine governor, wherein the governor power setpoint is determined based on the following method: acquiring a second current signal sent from the monitoring system to the turbine governor; determining the current signal range, the power setpoint range, and the range of a second intermediate variable, wherein the process of determining the range of the second intermediate variable is related to the correction and compensation process of the governor power setpoint; calculating the second intermediate variable based on the current signal range, the second current signal, and the range of the second intermediate variable; and calculating the governor power setpoint based on the power setpoint range, the second intermediate variable, and the range of the second intermediate variable.

[0057] For example, in the embodiments of this disclosure, the calculation of the governor power setpoint can be based on the following steps:

[0058] (1) Calculation of intermediate variable for governor power setting (i.e., the second intermediate variable mentioned above)

[0059] 1) The power command signal (i.e., the second current signal mentioned above) sent from the monitoring system to the speed controller is Ic;

[0060] 2) The range of 4 to 20 mA (i.e., the current signal range mentioned above) is calibrated as the range of calculated code values ​​(i.e., the range of the second intermediate variable mentioned above) βmin to βmax;

[0061] 3) Calculation formula for the intermediate variable of governor power setting (i.e., the second intermediate variable mentioned above):

[0062] β=[(βmax-βmin)*(Ic-4) / (20-4)]+βmin

[0063] (2) Calculation of power setpoint for speed controller

[0064] 1) The calculated code value range βmin~βmax is calibrated to correspond to the speed governor power setpoint range Pcmin~Pcmax;

[0065] 2) Formula for calculating the power setpoint of the speed governor:

[0066] Pc=[(Pcmax-Pcmin)*(β-βmin) / (βmax-βmin)]+Pcmin

[0067] (3) Speed ​​controller power setpoint compensation

[0068] For hydro-generator units, the installed capacity is set at the factory, therefore the governor power setpoint range Pcmin to Pcmax is not adjustable. 4–20mA is the standard value for converting non-current signals to current signals, which is an internationally accepted standard and cannot be modified. Based on the above calculation formulas, it can be seen that by reasonably adjusting the intermediate variables βmin and βmax, the governor power setpoint Pc can be corrected and compensated to compensate for changes caused by errors in the measurement source and signal transmission process.

[0069] This disclosure also proposes a diagnostic method for frequency oscillation of a turbine governor, wherein the displacement value of the main pressure regulating valve core is determined based on the following method: acquiring a third current signal from a main pressure regulating valve core displacement sensor; determining the current signal range, the valve core displacement range, and the range of a third intermediate variable, wherein the process of determining the range of the third intermediate variable is related to the correction and compensation process of the main pressure regulating valve core displacement value; calculating a third intermediate variable based on the current signal range, the third current signal, and the range of the third intermediate variable; and calculating the main pressure regulating valve core displacement value based on the valve core displacement range, the third intermediate variable, and the range of the third intermediate variable.

[0070] For example, in this embodiment of the disclosure, the calculation of the displacement value of the main pressure regulating valve core can be based on the following steps:

[0071] (1) Calculation of intermediate variable of valve core displacement of the main pressure distribution valve of the speed governor (i.e., the third intermediate variable mentioned above)

[0072] 1) Obtain the current signal (i.e., the third current signal mentioned above) Is through the displacement sensor of the main pressure regulating valve core;

[0073] 2) The range of 4 to 20 mA (i.e., the current signal range mentioned above) is calibrated as the range of calculated code values ​​(i.e., the range of the third intermediate variable mentioned above) θmin to θmax;

[0074] 3) Calculation formula for the intermediate variable of the valve core displacement of the main pressure regulating valve of the speed controller (i.e., the third intermediate variable mentioned above):

[0075] θ=[(θmax-θmin)*(Is-4) / (20-4)]+θmin

[0076] (2) Calculation of valve core displacement of the main pressure distribution valve of the speed controller

[0077] 1) The calculated code value range θmin~θmax is calibrated to correspond to the valve core displacement range Smin~Smax of the main pressure distribution valve of the speed governor;

[0078] 2) Formula for calculating the displacement of the main pressure distribution valve core of the speed controller:

[0079] S=[(Smax-Smin)*(θ-θmin) / (θmax-θmin)]+Smin

[0080] (3) Valve core displacement compensation of the main pressure distribution valve of the speed controller

[0081] For the main pressure regulating valve of the speed governor, its fully open and fully closed positions are pre-set at the factory and therefore cannot be adjusted. 4–20mA is the standard value for converting a non-current signal to a current signal, which is an internationally accepted standard and cannot be modified. Based on the above calculation formulas, it can be seen that by reasonably adjusting the intermediate variables θmin and θmax, the displacement S of the main pressure regulating valve core of the speed governor can be corrected and compensated for changes caused by errors in the measurement source and signal transmission process.

[0082] Figure 2 This is a flowchart illustrating a frequency oscillation diagnosis method for a turbine governor according to another embodiment of this disclosure.

[0083] like Figure 2 As shown, the frequency oscillation diagnosis method for the turbine governor includes:

[0084] S201: Obtain monitoring data of the turbine governor, including: governor residual pressure frequency measurement value, governor gear frequency measurement value, governor power sampling value, governor power setpoint value, and main pressure regulating valve core displacement value.

[0085] For a detailed description of S201, please refer to the above embodiments, which will not be repeated here.

[0086] S202: If the monitoring data meets the first preset condition within the preset time period, then the turbine governor is determined to be a residual pressure frequency oscillation.

[0087] The first preset condition includes:

[0088] The frequency measurement value of the residual voltage of the speed controller is greater than or equal to the first threshold n times consecutively;

[0089] The frequency measurement value of the residual voltage of the speed controller is less than or equal to the second threshold n times consecutively;

[0090] The frequency measurement value of the speed governor's gear disc is always greater than or equal to the third threshold and less than or equal to the fourth threshold;

[0091] The changes in the displacement value of the main pressure regulating valve core are always synchronized with the changes in the power feedback waveform of the speed controller, and no oscillation occurs.

[0092] In this embodiment of the disclosure, the first threshold can be 50.1Hz, the second threshold can be 49.9Hz, the third threshold can be 49.95Hz, and the fourth threshold can be 50.05Hz. Of course, each threshold can also be flexibly configured according to the application scenario, and there is no limitation thereto.

[0093] In other words, in this embodiment of the present disclosure, when the residual pressure frequency measurement oscillates continuously, the gear disc frequency measurement does not oscillate, and the main pressure regulating valve core displacement change and the power feedback waveform change are always synchronized and do not oscillate, it can be determined that the speed controller is experiencing residual pressure frequency measurement oscillation. At this time, the speed controller can cut the gear disc frequency measurement.

[0094] S203: If the monitoring data meets the second preset condition within the preset time period, the frequency oscillation diagnosis result of the turbine governor is determined to be the frequency oscillation of the gear disc.

[0095] The second preset condition includes:

[0096] The frequency measurement value of the speed regulator's gear disc is greater than or equal to the first threshold n times consecutively;

[0097] The frequency measurement value of the speed regulator's gear plate is less than or equal to the second threshold n times consecutively;

[0098] The residual voltage frequency measurement value of the speed governor is always greater than or equal to the third threshold and less than or equal to the fourth threshold;

[0099] The changes in the displacement value of the main pressure regulating valve core are always synchronized with the changes in the power feedback waveform of the speed controller, and no oscillation occurs.

[0100] In other words, in this embodiment of the present disclosure, when the gear disc frequency measurement oscillates continuously, the residual pressure frequency measurement does not oscillate, and the main pressure regulating valve core displacement change and the power feedback waveform change are always synchronized and do not oscillate, it can be determined that the speed controller is experiencing gear disc frequency measurement oscillation. At this time, the speed controller can switch off the residual pressure frequency measurement.

[0101] S204: If the monitoring data meets the third preset condition within the preset time period, the frequency oscillation diagnosis result of the turbine governor is determined to be governor system oscillation.

[0102] The third preset condition includes:

[0103] The power dead zone of the speed controller remained unchanged;

[0104] The number of times the target difference exceeds the power dead zone is greater than or equal to 2n, where the target difference is the absolute value of the difference between the speed governor power sample value and the speed governor power setpoint.

[0105] The S-waveform of the main pressure regulating valve core displacement value shows peaks more than or equal to n times.

[0106] The S-waveform of the main pressure regulating valve core displacement value shows a trough more than or equal to n times.

[0107] After the speed controller vibrates due to power feedback, the residual voltage frequency measurement and the gear disc frequency measurement oscillate simultaneously.

[0108] In other words, in this embodiment of the present disclosure, when the governor power setpoint remains essentially unchanged, the power dead zone Pgif remains unchanged, the governor power feedback waveform fluctuates continuously, the main pressure regulating valve core displacement change is always synchronized with the power feedback waveform change, and after the governor power feedback vibration has lasted for a period of time, when the governor residual pressure frequency measurement and the gear disc frequency measurement oscillate simultaneously, it can be determined that the governor system is experiencing frequency oscillation. At this time, the governor can be switched to manual control.

[0109] S205: If the monitoring data meets the fourth preset condition within the preset time period, the frequency oscillation diagnosis result of the turbine governor is determined to be power system oscillation.

[0110] The fourth preset condition includes:

[0111] The frequency of continuous fluctuations in the power command waveform of the speed controller precedes that of the power feedback waveform.

[0112] The power dead zone of the speed controller remained unchanged;

[0113] The number of times the target difference exceeds the power dead zone is greater than or equal to 2n, where the target difference is the absolute value of the difference between the speed governor power sample value and the speed governor power setpoint.

[0114] The S-waveform of the main pressure regulating valve core displacement value shows peaks more than or equal to n times.

[0115] The S-waveform of the main pressure regulating valve core displacement value shows a trough more than or equal to n times.

[0116] The residual pressure frequency measurement and the gear disc frequency measurement oscillate simultaneously with the power feedback of the speed controller.

[0117] In other words, in this embodiment of the present disclosure, when the frequency of continuous fluctuations in the power command waveform of the speed controller precedes that of the power feedback, the power dead zone Pgif remains unchanged, the displacement change of the main pressure distribution valve core is always synchronized with the change of the power feedback waveform, and then the frequency measurement of the residual pressure of the speed controller and the frequency measurement of the gear disc oscillate simultaneously, it can be determined that the speed controller is experiencing power system oscillation leading to frequency oscillation. At this time, the speed controller can be switched to manual control.

[0118] In this embodiment, by acquiring monitoring data of the turbine governor, including: governor residual pressure frequency measurement value, governor gear frequency measurement value, governor power sampling value, governor power setpoint value, and main pressure distribution valve core displacement value, if the monitoring data meets a first preset condition within a preset time period, the turbine governor is determined to be experiencing residual pressure frequency oscillation. If the monitoring data meets a second preset condition within a preset time period, the frequency oscillation diagnosis result of the turbine governor is determined to be gear frequency oscillation. If the monitoring data meets a third preset condition within a preset time period, the frequency oscillation diagnosis result of the turbine governor is determined to be governor system oscillation. If the monitoring data meets a fourth preset condition within a preset time period, the frequency oscillation diagnosis result of the turbine governor is determined to be power system oscillation. Thus, the oscillation source corresponding to the governor can be accurately and quickly determined, so as to take corresponding countermeasures in a timely manner, which can effectively improve the stability and safety of the system.

[0119] In the embodiments disclosed above, a new method for diagnosing governor frequency oscillations was designed based on research into the phenomenon of governor frequency oscillations. This method can accurately and automatically diagnose the source of governor frequency oscillations, effectively improving the automation level of the equipment. Simultaneously, the governor can automatically handle emergency situations without human intervention, reducing the workload of maintenance personnel. By reasonably adjusting the governor calculation code value (intermediate variable), corrections and compensations are made for the governor power setpoint, power feedback, and main pressure regulating valve core displacement. This increases the precision and accuracy of the governor power setpoint, power feedback, and main pressure regulating valve core position in control. It fills the gap in the hydropower industry where the frequency oscillation of turbine governors cannot be directly determined, and has important guiding significance for improving the safe and stable operation of hydro-generator units in the industry. This technology is suitable for widespread application throughout the industry.

[0120] Figure 3 This is a schematic diagram of the structure of a frequency oscillation diagnostic device for a water turbine governor according to an embodiment of this disclosure.

[0121] like Figure 3 As shown, the frequency oscillation diagnostic device 30 for the turbine governor includes:

[0122] The acquisition module 301 is used to acquire monitoring data of the turbine governor, including: governor residual pressure frequency measurement value, governor gear frequency measurement value, governor power sampling value, governor power setpoint value and main pressure regulating valve core displacement value.

[0123] The determination module 302 is used to determine the frequency oscillation diagnosis result of the turbine governor based on the monitoring data.

[0124] It should be noted that the aforementioned explanation of the frequency oscillation diagnosis method for the turbine governor also applies to the frequency oscillation diagnosis device for the turbine governor in this embodiment, and will not be repeated here.

[0125] In this embodiment, by acquiring monitoring data of the turbine governor, including: governor residual pressure frequency measurement value, governor gear frequency measurement value, governor power sampling value, governor power setpoint value, and main pressure distribution valve core displacement value, the frequency oscillation diagnosis result of the turbine governor is determined based on the monitoring data. This effectively reduces labor costs and accurately and automatically diagnoses the frequency oscillation source of the governor, thus effectively improving the automation level of the equipment.

[0126] Figure 4 A block diagram of an exemplary computer device suitable for implementing embodiments of the present disclosure is shown. Figure 4 The computer device 12 shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments disclosed herein.

[0127] like Figure 4 As shown, the computer device 12 is represented in the form of a general-purpose computing device. The components of the computer device 12 may include, but are not limited to: one or more processors or processing units 16, system memory 28, and a bus 18 connecting different system components (including system memory 28 and processing unit 16).

[0128] Bus 18 represents one or more of several bus architectures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus architectures. Examples of these architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnect (PCI) bus.

[0129] Computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by computer device 12, including volatile and non-volatile media, removable and non-removable media.

[0130] Memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM) 30 and / or cache memory 32. Computer device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 34 may be used to read and write non-removable, non-volatile magnetic media (…). Figure 4 Not shown; usually referred to as a "hard drive".

[0131] although Figure 4 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk") and an optical disc drive for reading and writing to a removable non-volatile optical disc (e.g., a compact disc read-only memory (CD-ROM), a digital video disc read-only memory (DVD-ROM), or other optical media) may be provided. In these cases, each drive may be connected to bus 18 via one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of this disclosure.

[0132] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28. Such program modules 42 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. Program modules 42 typically perform the functions and / or methods described in the embodiments of this disclosure.

[0133] Computer device 12 can also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), and with one or more devices that enable human interaction with the computer device 12, and / or with any device that enables the computer device 12 to communicate with one or more other computing devices (e.g., network card, modem, etc.). This communication can be performed via input / output (I / O) interface 22. Furthermore, computer device 12 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 20. As shown, network adapter 20 communicates with other modules of computer device 12 via bus 18. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0134] The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, such as implementing the frequency oscillation diagnosis method for the turbine governor mentioned in the foregoing embodiments.

[0135] To implement the above embodiments, this disclosure also proposes a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the frequency oscillation diagnosis method for a water turbine governor as proposed in the foregoing embodiments of this disclosure.

[0136] To implement the above embodiments, this disclosure also proposes a computer program product that, when the instruction processor in the computer program product is executed, performs the frequency oscillation diagnosis method for a water turbine governor as proposed in the foregoing embodiments of this disclosure.

[0137] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0138] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

[0139] It should be noted that in the description of this disclosure, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0140] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.

[0141] It should be understood that various parts of this disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0142] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0143] Furthermore, the functional units in the various embodiments of this disclosure can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0144] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0145] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0146] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A method for diagnosing frequency oscillations in a hydro turbine governor, characterized in that, include: Acquire monitoring data of the turbine governor, wherein the monitoring data includes: governor residual pressure frequency measurement value, governor gear frequency measurement value, governor power sampling value, governor power setpoint value and main pressure distribution valve core displacement value; Based on the monitoring data, the frequency oscillation diagnosis result of the turbine governor is determined; The step of determining the frequency oscillation diagnosis result of the turbine governor based on the monitoring data includes: If the monitoring data meets a first preset condition within a preset time period, then the turbine governor is determined to be in residual pressure frequency oscillation mode, wherein the first preset condition includes: The residual pressure frequency measurement value of the speed controller is greater than or equal to the first threshold and appears continuously n times; The residual pressure frequency measurement value of the speed controller is less than or equal to the second threshold and occurs continuously n times; The frequency measurement value of the speed regulator's gear disc is always greater than or equal to the third threshold and less than or equal to the fourth threshold; The change in the displacement value of the main pressure regulating valve core is always synchronized with the change in the power feedback waveform of the speed controller, and no oscillation occurs. The step of determining the frequency oscillation diagnosis result of the turbine governor based on the monitoring data includes: If the monitoring data meets the second preset condition within a preset time period, then the frequency oscillation diagnosis result of the turbine governor is determined to be a toothed disc frequency oscillation, wherein the second preset condition includes: The frequency measurement value of the speed regulator's gear disc is greater than or equal to the first threshold and appears continuously n times; The frequency measurement value of the speed regulator's gear disc is less than or equal to the second threshold and occurs continuously n times; The residual voltage frequency measurement value of the speed controller is always greater than or equal to the third threshold and less than or equal to the fourth threshold. The change in the displacement value of the main pressure regulating valve core is always synchronized with the change in the power feedback waveform of the speed controller, and no oscillation occurs.

2. The method as described in claim 1, characterized in that, The residual voltage frequency measurement value of the speed controller is determined based on the following method: Determine the unit speed and the number of generator pole pairs; The frequency value of the residual voltage of the governor is calculated based on the unit speed and the number of generator pole pairs.

3. The method as described in claim 1, characterized in that, The frequency measurement value of the speed regulator gear disc is determined based on the following method: While the unit is rotating, a pulse signal indicating the unit's speed is acquired; The frequency value of the speed regulator gear plate is determined based on the pulse signal.

4. The method as described in claim 1, characterized in that, The speed controller power sampling value is determined based on the following method: Obtain the first current signal from the speed controller power transmitter; The range of the current signal, the range of the power sampling, and the range of the first intermediate variable are determined, wherein the process of determining the range of the first intermediate variable is related to the correction and compensation process of the power sampling value of the speed controller; The first intermediate variable is calculated based on the current signal range, the first current signal, and the first intermediate variable range; The power sampling value of the speed controller is calculated based on the power sampling range, the first intermediate variable, and the range of the first intermediate variable.

5. The method as described in claim 1, characterized in that, The power setpoint of the speed controller is determined based on the following method: Acquire the second current signal sent by the monitoring system to the turbine governor; The range of the current signal, the range of the power setpoint, and the range of the second intermediate variable are determined, wherein the process of determining the range of the second intermediate variable is related to the correction and compensation process of the power setpoint of the speed controller; The second intermediate variable is calculated based on the current signal range, the second current signal, and the second intermediate variable range. The power setpoint of the speed controller is calculated based on the power setpoint range, the second intermediate variable, and the range of the second intermediate variable.

6. The method as described in claim 1, characterized in that, The displacement value of the main pressure regulating valve core is determined based on the following method: The third current signal is obtained from the valve core displacement sensor of the main pressure regulating valve; The range of the current signal, the range of the valve core displacement, and the range of the third intermediate variable are determined, wherein the process of determining the range of the third intermediate variable is related to the correction and compensation process of the valve core displacement value of the main pressure regulating valve; The third intermediate variable is calculated based on the current signal range, the third current signal, and the third intermediate variable range. The valve core displacement value of the main pressure regulating valve is calculated based on the valve core displacement range, the third intermediate variable, and the range of the third intermediate variable.

7. The method as described in claim 1, characterized in that, The step of determining the frequency oscillation diagnosis result of the turbine governor based on the monitoring data includes: If the monitoring data meets a third preset condition within a preset time period, then the frequency oscillation diagnosis result of the turbine governor is determined to be governor system oscillation, wherein the third preset condition includes: The power dead zone of the speed controller remained unchanged; The number of times the target difference exceeds the power dead zone is greater than or equal to 2n, wherein the target difference is the absolute value of the difference between the speed controller power sample value and the speed controller power setpoint; The S-waveform of the main pressure regulating valve core displacement value shows a peak number greater than or equal to n. The S-waveform of the main pressure regulating valve core displacement value shows a trough more than or equal to n times. After the speed controller vibrates due to power feedback, the residual voltage frequency measurement and the gear disc frequency measurement oscillate simultaneously.

8. The method as described in claim 1, characterized in that, The step of determining the frequency oscillation diagnosis result of the turbine governor based on the monitoring data includes: If the monitoring data meets a fourth preset condition within a preset time period, then the frequency oscillation diagnosis result of the turbine governor is determined to be power system oscillation, wherein the fourth preset condition includes: The frequency of continuous fluctuations in the power command waveform of the speed controller precedes that of the power feedback waveform. The power dead zone of the speed controller remained unchanged; The number of times the target difference exceeds the power dead zone is greater than or equal to 2n, wherein the target difference is the absolute value of the difference between the speed controller power sample value and the speed controller power setpoint; The S-waveform of the main pressure regulating valve core displacement value shows a peak number greater than or equal to n. The S-waveform of the main pressure regulating valve core displacement value shows a trough more than or equal to n times. The residual pressure frequency measurement and the gear disc frequency measurement oscillate simultaneously with the power feedback of the speed controller.

9. A diagnostic device for frequency oscillation of a turbine governor, characterized in that, include: The acquisition module is used to acquire monitoring data of the turbine governor, wherein the monitoring data includes: governor residual pressure frequency measurement value, governor gear frequency measurement value, governor power sampling value, governor power setpoint value, and main pressure distribution valve core displacement value. The determination module is used to determine the frequency oscillation diagnosis result of the turbine governor based on the monitoring data; The determining module is specifically used for: If the monitoring data meets a first preset condition within a preset time period, then the turbine governor is determined to be in residual pressure frequency oscillation mode, wherein the first preset condition includes: The residual pressure frequency measurement value of the speed controller is greater than or equal to the first threshold and appears continuously n times; The residual pressure frequency measurement value of the speed controller is less than or equal to the second threshold and occurs continuously n times; The frequency measurement value of the speed regulator's gear disc is always greater than or equal to the third threshold and less than or equal to the fourth threshold; The change in the displacement value of the main pressure regulating valve core is always synchronized with the change in the power feedback waveform of the speed controller, and no oscillation occurs. The determining module is further configured to: If the monitoring data meets the second preset condition within a preset time period, then the frequency oscillation diagnosis result of the turbine governor is determined to be a toothed disc frequency oscillation, wherein the second preset condition includes: The frequency measurement value of the speed regulator's gear disc is greater than or equal to the first threshold and appears continuously n times; The frequency measurement value of the speed regulator's gear disc is less than or equal to the second threshold and occurs continuously n times; The residual voltage frequency measurement value of the speed controller is always greater than or equal to the third threshold and less than or equal to the fourth threshold. The change in the displacement value of the main pressure regulating valve core is always synchronized with the change in the power feedback waveform of the speed controller, and no oscillation occurs.

10. A computer device, characterized in that, include: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-8.

11. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, in, The computer instructions are used to cause the computer to perform the method according to any one of claims 1-8.

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