A method and system for controlling a hydroelectric power station unit based on LCU control

Abstract

The application discloses a kind of water power station unit control method and system based on LCU control, it is related to water power station unit control technical field, including: detecting unit starting condition, starting process is carried out;Carry out steady state judgment, judge whether unit exists abnormal condition and carry out corresponding protective measure;According to unit LCU water machine protection tripping matrix and unit LCU program protection tripping matrix, protective measure is carried out to unit.The water power station unit control method based on LCU control provided in the application realizes the accurate control to water power station unit, to improve the control precision of unit, reduce error, improve power generation efficiency, realize the stable control to water power station unit, to improve the stability of unit, reduce the vibration and fluctuation of unit, prolong the service life of unit, to realize the safe control to water power station unit, to guarantee the safe operation of water power station, reduce the possibility of accident occurrence, protect the safety of personnel and equipment.

Description

Technical Field

[0001] This invention relates to the field of hydropower station unit control technology, specifically to a hydropower station unit control method and system based on LCU control. Background Technology

[0002] With the continuous development of industrial control technology and IT technology, the automation system of hydropower stations has evolved from "centralized control and decentralized functions" to "hierarchical distributed control", and then to the currently popular "automation, unmanned operation and intelligence". All of these systems have adopted computer system control to replace the conventional control methods of the past, realizing a centralized monitoring method of "unmanned operation, closed operation and network control", which has greatly improved the automation level and operational efficiency of hydropower stations.

[0003] Currently, industrial control technology and IT technology can seamlessly connect various control devices in hydropower stations through standard and open TCP / IP protocols and gigabit Ethernet technology, enabling high-speed data transmission and real-time control. The operation and control of hydropower station units are becoming increasingly important. Traditional hydropower station unit control methods mainly use PID controllers, but the parameters of this method need to be continuously adjusted and optimized, requiring a lot of time and effort. The response speed is slow, which cannot meet the requirements of high-speed operation, and the stability is poor, making it susceptible to external interference.

[0004] Therefore, there is an urgent need for a hydropower station unit control method based on LCU control, which has high dynamic response capability and high stability, and can realize automatic adjustment of system parameters, thereby reducing human intervention in the system, effectively improving the working performance of the unit, and enhancing the stability of the unit. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the above-mentioned problems, the present invention is proposed.

[0007] Therefore, the technical problem solved by this invention is that existing hydropower station unit control methods mainly use PLC control, which has a slow response speed, cannot meet the requirements of high-speed response, has low reliability, is prone to failure, affects the normal operation of the unit, and has poor flexibility in PLC control, which cannot meet the control requirements in different scenarios.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a hydropower station unit control method based on LCU control, comprising:

[0009] Test the unit's start-up conditions and proceed with the start-up process;

[0010] Perform steady-state assessment to determine if there are any abnormal conditions in the unit and implement corresponding protective measures.

[0011] Based on the unit's LCU water turbine protection trip matrix and the unit's LCU program protection trip matrix, protective measures are implemented for the unit.

[0012] As a preferred embodiment of the LCU-based hydropower station unit control method of the present invention, the detection of unit start-up conditions includes:

[0013] Determine the status of the LCU unit, unit outlet circuit breaker, disconnector, excitation system, governor, governor hydraulic device, butterfly valve and hydraulic system, protection device, braking system, speed device, abnormal signal, PT working position and accident signal. If all of the above statuses pass the test, the unit is considered ready to start. If any one of the tests fails, stop the subsequent tests, diagnose the fault, resolve the fault, and then re-test the start-up conditions.

[0014] As a preferred embodiment of the LCU-based hydropower station unit control method of the present invention, the steady-state determination includes:

[0015] Steady-state judgment during shutdown, no-pressure steady-state judgment, no-load pressurized steady-state judgment, and grid-connected steady-state judgment: During unit operation, various parameters of the unit are monitored and analyzed to determine whether the unit is in a steady-state operating state. If it is determined to be in a non-steady-state state, the unit is shut down for adjustment and maintenance. If it is determined to be in a stable state, the hydropower station unit is operating normally. If the parameter situation cannot be determined, it is reported to the operation and maintenance personnel for testing, determining the cause of the fault, and analyzing the fault log and monitoring data. If the fault log has a solution, steady-state control is implemented. If the fault log does not have a solution, the problem of parameter instability is saved for maintenance personnel to maintain. If the steady-state judgment fails and the speed ≥1%Ne exceeds 10 seconds, it is determined that the unit is creeping, and it is immediately shut down for inspection and maintenance.

[0016] As a preferred embodiment of the hydropower station unit control method based on LCU control described in this invention, the shutdown steady-state judgment includes: the unit outlet circuit breaker GCB is open, the unit speed is <1%Ne, and the unit voltage Uab is <1KV.

[0017] The no-voltage steady-state judgment includes the tripping of the unit's outlet circuit breaker GCB, the unit speed > 95%Ne, and the unit voltage Uab < 1KV.

[0018] The no-load and voltage steady-state judgment includes the tripping of the unit's outlet circuit breaker, the unit speed > 95%Ne, and the unit voltage Uab > 9.5KV;

[0019] The grid-connected steady-state judgment includes the unit's outlet circuit breaker being closed, the unit speed being >95%Ne, and the unit voltage Uab being >9.5KV.

[0020] As a preferred embodiment of the hydropower station unit control method based on LCU control described in this invention, the unit LCU turbine protection trip matrix includes: turbine accident shutdown and turbine emergency shutdown.

[0021] When the unit's bearing temperature is too high and the electrical protection trips, the protection trip type is water turbine accident shutdown.

[0022] When the water turbine is judged to have stopped due to an accident and the shear pin is broken, the protection trip type is water turbine emergency shutdown.

[0023] As a preferred embodiment of the LCU-based hydropower station unit control method described in this invention, the unit LCU program protection trip matrix includes:

[0024] When a water turbine protection failure occurs and the unit's voltage fluctuation exceeds the threshold, the protection trip type is programmed accident shutdown.

[0025] When a program-induced shutdown occurs and the shear pin breaks, the protection trip type is program-based emergency shutdown.

[0026] As a preferred embodiment of the LCU-based hydropower station unit control method of the present invention, the unit protection measures include:

[0027] Install overcurrent, overvoltage, undervoltage, temperature, and leakage current protectors. When the water cooling system of the hydropower station unit detects an abnormality, activate the LCU water turbine protection trip matrix for protection.

[0028] When the hydropower station unit control system detects an abnormality, it activates the LCU program protection trip matrix for protection.

[0029] When other systems of the hydropower station unit malfunction, the installed protectors, the unit LCU turbine protection trip matrix, and the unit LCU program protection trip matrix are activated to attempt to resolve the malfunction. If the malfunction is resolved, the malfunction details are recorded in the fault log. When the same malfunction occurs again, the same protection trip matrix is ​​used for protection.

[0030] Another objective of this invention is to provide a hydropower station unit control system based on LCU control, which can solve the problems of insufficient safety and stability of the unit through more comprehensive and precise control and protection of the unit, and ensure the normal operation of the hydropower station.

[0031] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a hydropower station unit control system based on LCU control, comprising:

[0032] Data acquisition module, data processing module, remote monitoring module, data storage module;

[0033] As a preferred embodiment of the hydropower station unit control system based on LCU control described in this invention, the data acquisition module is a data acquisition device used to collect unit operating status, water level, and water pressure data through sensors and other equipment, and transmit the data to the data processing module.

[0034] As a preferred embodiment of the LCU-based hydropower station unit control system described in this invention, the data processing module is a device for processing acquired data, used to process and analyze the data acquired by the data acquisition module, determine whether there are any abnormalities in the unit, and perform control and protection.

[0035] As a preferred embodiment of the hydropower station unit control system based on LCU control described in this invention, the remote monitoring module is a device for monitoring and operating the unit, used to realize remote monitoring and control of the data processing module.

[0036] In a preferred embodiment of the LCU-based hydropower station unit control system described in this invention, the data storage module is a device for evaluating the operating status and is used to transfer data from the data acquisition module.

[0037] The data processing module and the remote monitoring module store the data and processing results for subsequent data analysis and assessment of the unit's operating status.

[0038] A computer device includes a memory and a processor, the memory storing a computer program, characterized in that the processor executes the computer program to implement the steps of the method described above.

[0039] A computer-readable storage medium having a computer program stored thereon, characterized in that the computer program, when executed by a processor, implements the steps of the method described above.

[0040] The beneficial effects of this invention are as follows: The LCU-based hydropower station unit control method provided by this invention achieves precise control of the hydropower station unit, thereby improving the control accuracy, reducing errors, and increasing power generation efficiency. Using LCU-controlled hydropower station units enables stable control, thereby improving unit stability, reducing vibration and fluctuations, extending unit service life, and achieving safe control of the hydropower station unit. This ensures the safe operation of the hydropower station, reduces the possibility of accidents, and protects the safety of personnel and equipment. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0042] Figure 1 A flowchart illustrating an overall process for a hydropower station unit control method based on LCU control, as provided in one embodiment of the present invention.

[0043] Figure 2 An overall structural diagram of a hydropower station unit control system based on LCU control is provided for the second embodiment of the present invention;

[0044] Figure 3 This is a comparison chart of the unit creep state judgment speed under different conditions provided by the fourth embodiment of the present invention, which is a hydropower station unit control method based on LCU control.

[0045] Figure 4 This is a voltage comparison diagram for judging the creep state of a hydropower station unit under different conditions, provided in the fourth embodiment of the present invention, which is a control method for hydropower station units based on LCU control.

[0046] Figure 5 This is a comparison chart of the shutdown steady-state judgment speed under different conditions for a hydropower station unit control method based on LCU control provided in the fourth embodiment of the present invention;

[0047] Figure 6 This is a comparison diagram of the steady-state shutdown judgment voltage under different conditions for a hydropower station unit control method based on LCU control provided in the fourth embodiment of the present invention;

[0048] Figure 7 A comparison diagram of rotational speed under different conditions for determining unpressurized steady state, no-load pressurized steady state, and grid-connected steady state in a hydropower station unit control method based on LCU control provided in the fourth embodiment of the present invention;

[0049] Figure 8 The fourth embodiment of the present invention provides a voltage comparison diagram of no-load voltage steady-state judgment and grid-connected steady-state judgment under different conditions for a hydropower station unit control method based on LCU control. Detailed Implementation

[0050] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0051] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0052] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0053] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0054] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] Example 1

[0057] Reference Figure 1As an embodiment of the present invention, a hydropower station unit control method based on LCU control is provided, comprising:

[0058] Test the unit's start-up conditions and proceed with the start-up process.

[0059] Perform steady-state assessment to determine if there are any abnormalities in the unit and implement corresponding protective measures.

[0060] Based on the unit's LCU water turbine protection trip matrix and the unit's LCU program protection trip matrix, protective measures are implemented for the unit.

[0061] The start-up conditions of the unit are tested by checking the status of the LCU unit, the unit outlet circuit breaker, the disconnect switch, the excitation system, the speed governor, the speed governor hydraulic device, the butterfly valve and hydraulic system, the protection device, the braking system, the speed device, the abnormal signals, the PT working position and the fault signal. If all of the above statuses pass the test, the start-up preparation is considered complete. If any one of the tests fails, the subsequent tests are stopped, the fault is diagnosed, and the start-up conditions are tested again after the fault is resolved.

[0062] The LCU unit is in automatic control mode, the LCU power switch is closed, the LCU water turbine circuit power supply is normal, and there are no alarms from the synchronizing unit.

[0063] Unit outlet circuit breaker: The control mode is remote control, the spring is already energized, and it is in the open position.

[0064] Disconnect switch: Unit outlet disconnect switch, control method is remote control, closed position, unit neutral point disconnect switch, closed position, unit outlet grounding switch, open position.

[0065] Excitation system: The DC power supply of the regulating cabinet is normal, the excitation system is normal, there are no comprehensive faults in the excitation system, the regulator is fault-free, the power bridge is not disengaged, and the control mode is remote and not manual.

[0066] Speed ​​controller: Control mode is remote and not manual, no power loss alarm signal, no speed controller emergency stop alarm.

[0067] Speed ​​controller hydraulic device: Low oil level signal in no-pressure oil tank, low oil pressure signal in no-pressure oil tank accident, low oil level signal in no-return oil tank, no fault in soft start of oil pump, automatic control mode of butterfly valve, normal power supply to solenoid valve of hydraulic station.

[0068] Butterfly valve and hydraulic system: The butterfly valve is in automatic control mode, the power supply of the hydraulic station solenoid valve is normal, the oil pump is automatic and fault-free, the oil level in the hydraulic station tank is not too low, the mechanical lock is disengaged, the maintenance seal is disengaged, the guide vane is fully closed, the butterfly valve is not fully open, there is no LCU emergency valve closing signal, there is no accidental low oil pressure, and there is no valve opening failure.

[0069] Protection devices: No alarm signal from the main generator protection device, no alarm signal from the backup generator protection device.

[0070] Braking system: The temperature measuring brake panel has no AC or DC power alarms, but the brake air source is pressurized.

[0071] Speed ​​measurement device: No fault alarm signal from the gear disc speed measuring device, no fault alarm signal from the residual pressure speed measuring device.

[0072] Abnormal signals: The oil temperature of each bearing is normal, the bearing bearing pad temperature is normal, there is no low signal for the upper and lower guide oil levels, no high signal for the water guide oil level, no high or excessively high signal for the top cover water level, and the guide vanes are fully closed.

[0073] Work location: The work location is the designated location.

[0074] Accident signal status: No unit accident shutdown action signal, no unit emergency shutdown action signal, no shear pin shearing signal.

[0075] Steady-state assessment includes: shutdown steady-state assessment, no-load and pressureless steady-state assessment, no-load and pressurized steady-state assessment, and grid-connected steady-state assessment. During unit operation, various parameters of the unit are monitored and analyzed to determine whether the unit is in a steady-state operating state. If it is determined to be unsteady, the unit is shut down for adjustment and maintenance. If it is determined to be in a stable state, the hydropower station unit is operating normally. If the parameter situation cannot be determined, it is reported to the operation and maintenance personnel for testing, determining the cause of the fault, and analyzing the fault log and monitoring data. If the fault log has a solution, steady-state control is implemented. If the fault log does not have a solution, the problem of parameter instability is saved for maintenance personnel to maintain. If the steady-state assessment fails and the speed ≥1%Ne exceeds 10 seconds, it is determined that the unit is creeping, and it is immediately shut down for inspection and maintenance.

[0076] The shutdown steady-state judgment includes: the unit's outlet circuit breaker GCB is open, the unit speed is <1%Ne, and the unit voltage Uab is <1KV.

[0077] The no-voltage steady-state judgment includes the tripping of the unit's outlet circuit breaker GCB, the unit speed > 95%Ne, and the unit voltage Uab < 1KV.

[0078] The no-load and voltage steady-state judgment includes the tripping of the unit's outlet circuit breaker, the unit speed > 95%Ne, and the unit voltage Uab > 9.5KV.

[0079] The grid-connected steady-state judgment includes the unit's outlet circuit breaker being closed, the unit speed being >95%Ne, and the unit voltage Uab being >9.5KV.

[0080] The unit's LCU water turbine protection trip matrix includes: water turbine accident shutdown and water turbine emergency shutdown.

[0081] When the unit's bearing temperature is too high and the electrical protection trips, the protection trip type is water turbine accident shutdown.

[0082] When the water turbine is judged to have stopped due to an accident and the shear pin is broken, the protection trip type is water turbine emergency shutdown.

[0083] The unit's LCU program protection trip matrix includes: when a water turbine protection failure occurs and the unit's voltage fluctuation exceeds the threshold, the protection trip type is program failure shutdown.

[0084] When a program-induced shutdown occurs and the shear pin breaks, the protection trip type is program-based emergency shutdown.

[0085] Protective measures for the generating units include: installing overcurrent, overvoltage, undervoltage, temperature, and leakage current protectors; and activating the LCU water turbine protection trip matrix to protect the generating units when an abnormality is detected in the water cooling system.

[0086] When the hydropower station's unit control system detects an anomaly, it activates the LCU program to protect the trip matrix.

[0087] When other systems of the hydropower station unit malfunction, the installed protectors, the unit LCU turbine protection trip matrix, and the unit LCU program protection trip matrix are activated to attempt to resolve the malfunction. If the malfunction is resolved, the malfunction details are recorded in the fault log. When the same malfunction occurs again, the same protection trip matrix is ​​used for protection.

[0088] Example 2

[0089] Reference Figure 2 As one embodiment of the present invention, a hydropower station unit control system based on LCU control is provided, comprising:

[0090] Data acquisition module 100, data processing module 200, remote monitoring module 300, data storage module 400.

[0091] The data acquisition module 100 is a device for acquiring data, used to collect data on the unit's operating status, water level, and water pressure through sensors and other equipment, and transmit the data to the data processing module 200.

[0092] The data processing module 200 is a device for processing acquired data. It is used to process and analyze the data collected by the data acquisition module 100, determine whether there are any abnormalities in the unit, and perform control and protection.

[0093] The remote monitoring module 300 is a device for monitoring and operating the unit, used to realize remote monitoring and control of the data processing module 200.

[0094] The data storage module 400 is a device for evaluating the operating status. It stores the data and processing results from the data acquisition module 100, the data processing module 200, and the remote monitoring module 300 for subsequent data analysis and evaluation of the unit's operating status.

[0095] Example 3

[0096] One embodiment of the present invention differs from the previous two embodiments in that:

[0097] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0098] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0099] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0100] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in 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.

[0101] Example 4

[0102] Reference Figure 3-8 As an embodiment of the present invention, a hydropower station unit control method based on LCU control is provided. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiment.

[0103] In this embodiment, a specific application experiment of the method of the present invention was conducted. Under the same pre-set experimental environment, five sets of experiments were carried out on the existing conventional method and the method of this embodiment, respectively. The specific experimental results are shown in Tables 1 and 2.

[0104] Table 1. Comparison of Fault Diagnosis Time (Unit: seconds)

[0105] Group Traditional Method 1 Traditional Method 2 Traditional Method 3 This method 1 65 40 70 28 2 61 45 73 31 3 62 43 76 33 4 59 42 71 30 5 60 41 75 29 Average time 61.4 42.2 73 30.2

[0106] Table 2 Comparison of Fault Detection Accuracy

[0107]

[0108]

[0109] As shown in Table 1, the minimum fault diagnosis time for traditional method 1 is 59s, and the average time is 61.4s; the minimum fault diagnosis time for traditional method 2 is 40s, and the average time is 42.2s; the minimum fault diagnosis time for traditional method 3 is 70s, and the average time is 73s; and the fault diagnosis time for the method of this invention is 28s, and the average time is 30.2s.

[0110] The maximum latency of the proposed method is lower than that of traditional methods, which proves that the proposed method is effective and reduces the detection waiting time.

[0111] As shown in Table 2, the detection accuracy of traditional method 1 is the lowest at 85.7% and the average accuracy is 87.12%, the detection accuracy of traditional method 2 is the lowest at 79.5% and the average accuracy is 84.54%, the detection accuracy of traditional method 3 is the lowest at 84.8% and the average accuracy is 87.78%, and the detection accuracy of the method of this invention is the lowest at 96.5% and the average accuracy is 97.84%. The detection accuracy of the method in this invention is higher than that of traditional methods, which proves that the method in this invention reduces operation and maintenance management costs, improves detection quality, and reduces labor costs.

[0112] The comparative experiments above demonstrate that the method of this invention significantly reduces latency compared to existing technologies, thus reducing the time spent; at the same time, it greatly reduces the error rate while maintaining real-time performance.

[0113] For the algorithm in the above embodiments, the probability of occurrence is used as an evaluation variable to measure the accuracy of the algorithm.

[0114] from Figure 3-4 It can be seen that when the rated speed exceeds 1%, the probability of unit creep is 97%, and unit creep is likely to occur. Statistical analysis of the time when the rated speed exceeds 1% shows that when the rated speed exceeds 1% for more than 10 seconds, the probability of creep is 98%, which is finally determined as the condition for judging unit creep.

[0115] from Figure 5-6 It can be seen that when the rated speed is less than 1%, the accuracy rate of judging the steady state of the shutdown is 97%, and when the unit voltage Uab is less than 1KV, the final accuracy rate of judging the steady state of the machine is 99%.

[0116] from Figures 7-8 It can be seen that when the rated speed exceeds 95%, the accuracy rate for judging the no-load steady state, the no-load pressurized steady state, and the grid-connected steady state is 96%. Combined with the unit voltage, when the unit voltage Uab < 1KV, the accuracy rate for judging the no-load steady state is 97%, and when the unit voltage Uab > 9.5KV, the accuracy rate for judging the no-load pressurized steady state and the grid-connected steady state is 98%.

[0117] Based on the experimental results, when the rotational speed ≥ 1%Ne exceeds 10 seconds, it is determined that the unit is in creep mode; when the unit speed < 1%Ne and the unit voltage Uab < 1KV, it is determined to be in a shutdown steady state; when the unit speed > 95%Ne and the unit voltage Uab < 1KV, it is determined to be in an idling, no-pressure steady state; when the unit speed > 95%Ne and the unit voltage Uab > 9.5KV, it is determined to be in an no-load, pressurized steady state; and when the unit speed > 95%Ne and the unit voltage Uab > 9.5KV, it is determined to be in a grid-connected steady state.

[0118] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for controlling a hydroelectric generating unit based on LCU control, characterized in that, include: Test the unit's start-up conditions and proceed with the start-up process; Perform steady-state assessment to determine if there are any abnormal conditions in the unit and implement corresponding protective measures. Based on the unit's LCU water turbine protection trip matrix and the unit's LCU program protection trip matrix, protective measures are implemented for the unit. The steady-state determination includes: Steady-state judgment during shutdown, no-pressure steady-state judgment during idling, pressurized steady-state judgment under no-load, and grid-connected steady-state judgment: During unit operation, various parameters of the unit are monitored and analyzed to determine whether the unit is in a steady-state operating state. If it is determined to be in a non-steady-state state, the unit is shut down for adjustment and maintenance. If it is determined to be in a stable state, the hydropower station unit is operating normally. If the parameter situation cannot be determined, it is reported to the operation and maintenance personnel for testing, determining the cause of the fault, and analyzing the fault log and monitoring data. If the fault log has a solution, steady-state control is implemented. If the fault log does not have a solution, the problem of parameter inability to determine the cause is saved for maintenance personnel to maintain. If the steady-state judgment fails and the speed ≥1%Ne exceeds 10 seconds, it is determined that the unit creep has occurred, and the unit is immediately shut down for inspection and maintenance. The shutdown steady-state judgment includes: the unit's output circuit breaker GCB is open, the unit speed is <1%Ne, and the unit voltage Uab is <1KV; The no-voltage steady-state judgment includes the tripping of the unit's outlet circuit breaker GCB, the unit speed > 95%Ne, and the unit voltage Uab < 1KV. The no-load and voltage steady-state judgment includes the tripping of the unit's outlet circuit breaker, the unit speed > 95%Ne, and the unit voltage Uab > 9.5KV; The grid-connected steady-state judgment includes the following conditions: the unit's outlet circuit breaker is closed, the unit speed is >95%Ne, and the unit voltage Uab is >9.5KV. The unit's LCU water turbine protection trip matrix includes: water turbine accident shutdown and water turbine emergency shutdown; When the unit's bearing temperature is too high and the electrical protection trips, the protection trip type is water turbine accident shutdown. When the water turbine is judged to be shut down due to an accident and the shear pin is sheared, the protection trip type is water turbine emergency shutdown; The unit LCU program protection trip matrix includes: When a water turbine protection failure occurs and the unit's voltage fluctuation exceeds the threshold, the protection trip type is programmed accident shutdown. When a program-induced shutdown occurs and the shear pin breaks, the protection trip type is program-emergency shutdown. The measures to protect the generator unit include: Install overcurrent, overvoltage, undervoltage, temperature, and leakage current protectors. When the water cooling system of the hydropower station unit detects an abnormality, activate the LCU water turbine protection trip matrix for protection. When the hydropower station unit control system detects an abnormality, it activates the LCU program protection trip matrix for protection. When other systems of the hydropower station unit malfunction, the installed protectors, the unit LCU turbine protection trip matrix, and the unit LCU program protection trip matrix are activated to attempt to resolve the malfunction. If the malfunction is resolved, the malfunction details are recorded in the fault log. When the same malfunction occurs again, the same protection trip matrix is ​​used for protection.

2. The LCU control based hydro power plant generator control method as claimed in claim 1, wherein, The startup conditions for the testing unit include: Determine the status of the LCU unit, unit outlet circuit breaker, disconnector, excitation system, governor, governor hydraulic device, butterfly valve and hydraulic system, protection device, braking system, speed device, abnormal signal, PT working position and accident signal. If all of the above statuses pass the test, the unit is considered ready to start. If any one of the tests fails, stop the subsequent tests, diagnose the fault, resolve the fault, and then re-test the start-up conditions.

3. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 2.

4. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 2.

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