A braking method and system for a hydro-generator set

Abstract

This invention discloses a braking method and system for a hydro-generator set, relating to the technical field of the hydropower industry. The braking method continuously acquires braking time-series data when the hydro-generator set is discharging tailwater, and performs data analysis to obtain the operational stability index, environmental correction index, and emission anomaly index at each time point. A comprehensive analysis is then performed to obtain the braking index at each time point. The comprehensive braking index change rate of the hydro-generator set to be braked is obtained through comprehensive analysis of the braking index at each time point. This invention compares the comprehensive braking index change rate with a preset threshold range and takes corresponding braking measures based on the comparison analysis results. This comprehensively and dynamically captures subtle changes under complex operating conditions and accurately identifies the braking timing, thereby avoiding over- or under-braking control and improving the accuracy and real-time performance of braking.

Description

Technical Field

[0001] This invention relates to the field of hydropower technology, specifically to a braking method and system for a hydro-generator set. Background Technology

[0002] Hydropower generator sets are one of the core pieces of equipment in modern hydropower stations, widely used in the process of converting water energy into electrical energy. Their working principle is to use the kinetic or potential energy of water flow to drive the turbine to rotate, which in turn drives the generator to generate electricity. Hydropower generator sets typically include core components such as turbines, generators, speed governors, and control systems. Their operating status directly affects the power generation efficiency, equipment lifespan, and environmental impact of the hydropower station. In the actual operation of hydropower generator sets, in addition to generating electricity, strict control must be exercised over the tailwater, powerhouse, and leakage discharge from the power plant. For example, when the tailwater discharge is abnormal, the hydropower generator set needs to be braked to prevent the discharged tailwater from causing pollution.

[0003] Existing technology, such as the patent application with publication number CN117005981A, discloses a braking control method, device, equipment, and medium for a hydro-generator set. The method includes: in response to receiving a signal to engage the air damper, determining whether the hydro-generator set needs to engage the air damper; if it is determined that the hydro-generator set needs to engage the air damper, first inflating the lower chamber of the air damper to engage the air damper; and in response to receiving a first speed signal, after a first waiting period, first venting the lower chamber of the air damper to deactivate the air damper. Therefore, by determining whether the hydro-generator set needs to engage the air damper upon receiving the signal, the air damper is engaged only when necessary, rather than directly engaging the air damper upon receiving the signal. This effectively avoids accidental engagement of the air damper and improves the engagement / deactivation interlocking logic of the air damper.

[0004] Based on the above findings, the limitations of existing technologies include at least the following problems: existing technologies fail to flexibly adjust to fluctuations in actual operating conditions, such as tailwater discharge, and lack comprehensive analysis of the unit's operating status. They also fail to fully consider the dynamic impact of multiple factors such as operating sequence and environmental conditions, resulting in insufficient accuracy in braking control decisions and difficulty in responding to complex changes in operating conditions in a timely manner. Consequently, the braking process becomes overly mechanized, which can lead to problems such as braking delay or over-braking when abnormal operating environments or complex operating conditions occur, thus hindering the safety and stability of the hydro-generator unit's operation. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a braking method and system for hydro-generator sets, which solves the problems of existing technologies failing to flexibly adjust to fluctuations in actual operating conditions and lacking comprehensive analysis of the unit's operating status.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a braking method for a hydro-generator unit, comprising the following steps: continuously acquiring braking timing data when the hydro-generator unit is discharging tailwater, the braking timing data including operating timing data, environmental timing data, and tailwater discharge timing data; performing data analysis on the braking timing data of the hydro-generator unit to be braked to obtain the operating stability index, environmental correction index, and discharge anomaly index of the hydro-generator unit to be braked at each time point, and performing comprehensive analysis to obtain the braking index of the hydro-generator unit to be braked at each time point; performing comprehensive analysis on the braking index of the hydro-generator unit to be braked at each time point to obtain the comprehensive braking index change rate of the hydro-generator unit to be braked; comparing the comprehensive braking index change rate of the hydro-generator unit to be braked with a preset comprehensive braking index change rate threshold range, and taking corresponding braking measures based on the comparison analysis results; wherein, the specific formula for calculating the braking index of the hydro-generator unit to be braked at each time point is as follows: ;in, The first hydro-generator unit to be braked Braking index at each time point The first hydro-generator unit to be braked The operational stability index at each point in time. The operating coefficients are stored in the database. The first hydro-generator unit to be braked Environmental correction index at a given time point These are environmental coefficients stored in the database. The first hydro-generator unit to be braked Anomaly index of emissions at each time point, The emission coefficients are stored in the database. , 1, 2, 3, ... , The number of time points, It is a natural constant.

[0007] Furthermore, the runtime sequence data includes the unit rotor temperature value, output torque value, shaft diameter pressure value, unit rotor axial force value, water flow pressure disturbance intensity value, turbulence intensity value, and water flow energy difference value at each time point; the environmental time series data includes the external humidity value, external temperature value, external electromagnetic interference value, and external suspended solids concentration value at each time point; and the tailwater discharge time series data includes the discharge pressure value, discharge color value, discharge sediment content value, discharge dissolved gas ratio, and discharge pollution index at each time point.

[0008] Furthermore, the specific steps for obtaining the operational stability index of the hydro-generator unit to be braked at each time point are as follows: Obtain the reference values ​​for the generator unit's rotor temperature, output torque, shaft pressure, rotor axial force, water flow pressure disturbance intensity, turbulence intensity, and head; obtain the reference values ​​for the generator unit's rotor temperature, output torque, shaft pressure, and rotor axial force, as well as the values ​​for each time point. A comprehensive analysis was conducted to obtain the unit fault index of the hydro-generator unit to be braked at each time point. Furthermore, a comprehensive analysis was performed on the reference values ​​of water flow pressure disturbance intensity, turbulence intensity, and head of the hydro-generator unit to be braked, as well as the water flow pressure disturbance intensity, turbulence intensity, and water flow energy difference at each time point, to obtain the water flow stability index of the hydro-generator unit to be braked at each time point. Finally, a comprehensive analysis of the unit fault index and water flow stability index of the hydro-generator unit to be braked at each time point yielded the operational stability index of the hydro-generator unit to be braked at each time point.

[0009] Furthermore, the specific formulas for calculating the unit fault index and operating stability index of the hydro-generator unit to be braked at each time point are as follows: ;in, The first hydro-generator unit to be braked Unit failure index at a given time point The first hydro-generator unit to be braked Unit rotor temperature values ​​at each time point This is the reference value for the rotor temperature of the hydro-generator unit to be braked. The rotor temperature coefficient is stored in the database. The first hydro-generator unit to be braked The output torque value at each time point This is a reference value for the output torque of the hydro-generator unit to be braked. The torque coefficient is stored in the database. The first hydro-generator unit to be braked Shaft diameter pressure values ​​at each time point This is the reference value for the shaft diameter pressure of the hydro-generator unit to be braked. The shaft diameter coefficient is stored in the database. The first hydro-generator unit to be braked The axial force value of the unit rotor at each time point This is a reference value for the axial force of the turbine generator unit rotor before braking. The axial force coefficients are stored in the database. The first hydro-generator unit to be braked The operational stability index at each point in time. The load factor is stored in the database. The first hydro-generator unit to be braked The water flow stability index at a given time point The flow coefficients are stored in the database. , 1, 2, 3, ... , The number of time points, It is a natural constant.

[0010] Furthermore, the specific steps for obtaining the environmental correction index of the hydro-generator unit to be braked at each time point are as follows: Obtain the external humidity reference value and external temperature reference value of the hydro-generator unit to be braked; normalize the external humidity reference value, external temperature reference value, and external humidity, external temperature, external electromagnetic interference, and external suspended matter concentration values ​​of the hydro-generator unit to be braked at each time point; and comprehensively analyze the normalized external humidity reference value, external temperature reference value, and external humidity, external temperature, external electromagnetic interference, and external suspended matter concentration values ​​of the hydro-generator unit to be braked at each time point to obtain the environmental correction index of the hydro-generator unit to be braked at each time point.

[0011] Furthermore, the specific steps for obtaining the emission anomaly index of the hydro-generator unit to be braked at each time point are as follows: Obtain the emission pressure reference value, emission color reference value, emission dissolved gas ratio reference value, and emission pollution reference index of the hydro-generator unit to be braked; and standardize the emission pressure reference value, emission color reference value, emission dissolved gas ratio reference value, emission pollution reference index, as well as the emission pressure value, emission color value, emission sediment content value, emission dissolved gas ratio, and emission pollution index of the hydro-generator unit to be braked at each time point; and comprehensively analyze the standardized emission pressure reference value, emission color reference value, emission dissolved gas ratio reference value, emission pollution reference index, as well as the emission pressure value, emission color value, emission sediment content value, emission dissolved gas ratio, and emission pollution index of the hydro-generator unit to be braked at each time point to obtain the emission anomaly index of the hydro-generator unit to be braked at each time point.

[0012] Furthermore, the specific formula for calculating the emission anomaly index of the hydro-generator unit to be braked at each time point is as follows: ;in, The first hydro-generator unit to be braked Anomaly index of emissions at each time point, The first standardized hydro-generator unit to be braked Emission pressure values ​​at specific time points This refers to the standardized reference value for the discharge pressure of the hydro-generator unit awaiting braking. The emission pressure coefficients are stored in the database. The first standardized hydro-generator unit to be braked Emission chromaticity values ​​at each time point The emission color reference value of the hydro-generator unit to be braked after standardization treatment. These are the chromaticity coefficients stored in the database. The first standardized hydro-generator unit to be braked Sediment content values ​​at each time point The sand content coefficient is stored in the database. The first standardized hydro-generator unit to be braked The ratio of dissolved gases emitted at each time point This refers to the reference value for the dissolved gas ratio in the emissions of the standardized hydro-generator unit awaiting braking. The dissolved gas coefficients are stored in the database. The first standardized hydro-generator unit to be braked Emissions pollution index at a specific time point The emission pollution reference index for the standardized hydro-generator unit awaiting braking is as follows: The pollution coefficient is stored in the database. , 1, 2, 3, ... , The number of time points.

[0013] Furthermore, the specific steps for obtaining the comprehensive braking index change rate of the hydro-generator unit to be braked are as follows: Analyze the change of braking index of the hydro-generator unit to be braked at each time point to obtain the braking index change rate of several adjacent time points of the hydro-generator unit to be braked; and conduct a comprehensive analysis of the braking index change rate of several adjacent time points of the hydro-generator unit to be braked to obtain the comprehensive braking index change rate of the hydro-generator unit to be braked.

[0014] Furthermore, the specific steps for taking corresponding braking measures based on the comparative analysis results are as follows: if the rate of change of the comprehensive braking index of the hydro-generator unit to be braked is lower than the lower limit of the preset threshold range of the comprehensive braking index change rate, the hydro-generator unit will not be braked; if the rate of change of the comprehensive braking index of the hydro-generator unit to be braked is within the preset threshold range of the comprehensive braking index change rate, the first braking measure will be taken; if the rate of change of the comprehensive braking index of the hydro-generator unit to be braked is higher than the upper limit of the preset threshold range of the comprehensive braking index change rate, the second braking measure will be taken.

[0015] A braking system for a hydro-generator unit includes: a data acquisition module, a data analysis module, a comprehensive analysis module, and a braking judgment module. The data acquisition module continuously acquires braking time-series data when the hydro-generator unit is discharging tailwater, including operational time-series data, environmental time-series data, and tailwater discharge time-series data. The data analysis module performs data analysis on the braking time-series data of the hydro-generator unit to be braked, obtaining the operational stability index, environmental correction index, and discharge anomaly index of the hydro-generator unit at each time point, and performs comprehensive analysis to obtain the braking index of the hydro-generator unit at each time point. The comprehensive analysis module performs comprehensive analysis on the braking index of the hydro-generator unit to be braked at each time point, obtaining the comprehensive braking index change rate of the hydro-generator unit to be braked. The braking judgment module compares the comprehensive braking index change rate of the hydro-generator unit to be braked with a preset comprehensive braking index change rate threshold range, and takes corresponding braking measures based on the comparison analysis results.

[0016] The present invention has the following beneficial effects:

[0017] (1) The braking method of the hydro-generator unit continuously acquires braking time sequence data and performs comprehensive analysis when the hydro-generator unit is in the tailwater discharge stage, thereby accurately obtaining the braking index and its rate of change at each time point, and comprehensively reflecting the operating status of the hydro-generator unit. This allows for dynamic capture of subtle changes under complex working conditions, avoids over- or under-braking control, and improves the accuracy and real-time performance of braking, while ensuring the operational safety and stability of the hydro-generator unit.

[0018] (2) The braking method of the hydro-generator unit, by analyzing multi-dimensional data of operation sequence, environmental sequence and tailwater discharge sequence, realizes the comprehensive calculation based on operation stability index, environmental correction index and discharge anomaly index, thereby improving the scientific nature of braking decision and effectively responding to complex situations such as environmental changes and discharge anomalies, thereby reducing equipment wear and extending the service life of the hydro-generator unit.

[0019] (3) The braking method of the hydro-generator unit, by comparing the comprehensive braking index change rate with the threshold range, flexibly adopts different braking measures to ensure that the braking mode can match the actual operating state, thereby reducing the braking delay or misjudgment caused by environmental anomalies or emission fluctuations, and optimizing the operating efficiency, thus providing an efficient solution for the braking of hydro-generator units under complex operating conditions.

[0020] (4) The braking system of the hydro-generator unit achieves closed-loop control of the intelligent braking process through continuous data acquisition by the data acquisition module, precise data processing by the analysis module, and the synergistic effect of the comprehensive analysis module and the braking judgment module. This gives it higher adaptability and scalability, and allows for customized adjustments based on the characteristics or operating environment of different hydro-generator units, thereby meeting the braking requirements under various complex working conditions and significantly improving the breadth and flexibility of application.

[0021] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0022] Figure 1 This is a flowchart of a braking method for a hydro-generator set according to the present invention.

[0023] Figure 2 This is a flowchart illustrating the steps of obtaining the operational stability index of the hydro-generator unit to be braked at each time point in the braking method of the hydro-generator unit of the present invention.

[0024] Figure 3 This is a block diagram of a braking system for a hydro-generator set according to the present invention. Detailed Implementation

[0025] The problem addressed in this application's embodiments can be summarized as follows:

[0026] When the hydro-generator unit is in the tailrace discharge state, braking time-series data is continuously acquired, including operating time-series data, environmental time-series data, and tailrace discharge time-series data. The data is analyzed separately to obtain the operating stability index, environmental correction index, and discharge anomaly index at each time point. These indicators are then comprehensively analyzed to derive the braking index at each time point. The braking index at each time point is then analyzed to obtain the comprehensive braking index change rate. This is compared with a preset comprehensive braking index change rate threshold range, and corresponding braking measures are taken based on the analysis results to achieve efficient control of the hydro-generator unit.

[0027] Please see Figure 1 This invention provides a technical solution: a braking method for a hydro-generator unit, comprising the following steps: When the hydro-generator unit is discharging tailwater, continuously acquire braking timing data (in this embodiment, the time interval is 5 minutes, and the braking timing data is used to determine whether the hydro-generator unit needs braking), the braking timing data includes operating timing data, environmental timing data, and tailwater discharge timing data; perform data analysis on the braking timing data of the hydro-generator unit to be braked, obtaining the operating stability index, environmental correction index, and discharge anomaly index of the hydro-generator unit at each time point, and perform comprehensive analysis to obtain the braking index of the hydro-generator unit at each time point (i.e., comprehensively assessing whether the hydro-generator unit needs braking operation during operation); perform comprehensive analysis on the braking index of the hydro-generator unit at each time point to obtain the comprehensive braking index change rate of the hydro-generator unit to be braked; compare the comprehensive braking index change rate of the hydro-generator unit to be braked with a preset comprehensive braking index change rate threshold range, and take corresponding braking measures based on the comparison analysis results; wherein, the specific formula for calculating the braking index of the hydro-generator unit to be braked at each time point is as follows: ;in, The first hydro-generator unit to be braked Braking index at each time point The first hydro-generator unit to be braked The operational stability index at each point in time. The operating coefficients are stored in the database. The first hydro-generator unit to be braked Environmental correction index at a given time point These are environmental coefficients stored in the database. The first hydro-generator unit to be braked Anomaly index of emissions at each time point, The emission coefficients are stored in the database. , 1, 2, 3, ... , The number of time points, It is a natural constant, and in this implementation example, it takes the value 2.71.

[0028] In this implementation example, five time points are used as a monitoring period to determine whether the rate of change of the comprehensive braking index within the monitoring period meets the braking measures, i.e., whether braking operation is required.

[0029] It needs to be explained that, , , The following steps can be taken to obtain the following data: Read the operating stability index, environmental correction index, and emission anomaly index of the hydro-generator unit to be braked at each time point (it should be noted that the operating stability index, environmental correction index, and emission anomaly index are all dimensionless values ​​and can be calculated directly), perform mean analysis, perform summation analysis based on the mean analysis results to obtain the braking sum value, and perform a ratio analysis between the mean analysis results and the braking sum value, using the ratio analysis results as the corresponding coefficients.

[0030] The runtime sequence data includes the unit rotor temperature, output torque, shaft diameter pressure, unit rotor axial force, water flow pressure disturbance intensity, turbulence intensity, and water flow energy difference at each time point. The environmental time series data includes the external humidity, external temperature, external electromagnetic interference, and external suspended solids concentration at each time point. The tailwater discharge time series data includes the discharge pressure, discharge color, discharge sediment content, discharge dissolved gas ratio, and discharge pollution index at each time point.

[0031] The rotor temperature value is the average temperature of all components of the generator rotor in the hydro-generator unit (the rotor is generally composed of a main shaft, rotor core, and magnetic poles, and there is only one rotor). The temperature of each component can be obtained through temperature sensors. It is used to reflect the unit load and to indicate whether the unit is overloaded or has excessive mechanical friction.

[0032] The output torque value is the torsional force transmitted from the turbine rotor to the generator, which can be obtained through a torque sensor and is used to reflect the working faults of the turbine generator set.

[0033] The shaft diameter pressure value is the pressure in the axial direction of the turbine rotor shaft, which can be obtained by a shaft diameter pressure sensor. It is used to reflect the load on the bearings in the turbine generator set, thereby causing wear, overheating or bearing failure.

[0034] The axial force of the turbine rotor is the force acting on the turbine rotor along the rotor axis. It can be obtained by a strain gauge force sensor and is used to reflect the operational stability of the turbine generator unit.

[0035] The water flow disturbance intensity value is the standard deviation of the pressure values ​​of the water flow at different locations of the turbine generator unit. The pressure value at each location can be obtained by a pressure sensor. It is used to reflect the stability of the water flow, and the more stable the water flow, the more stable the unit operation.

[0036] Turbulence intensity is the degree of turbulence in water flow, which can be obtained by turbulence sensors. It is used to reflect the drastic and irregular changes in water flow velocity. The higher the turbulence intensity value, the more severe the instability in the fluid.

[0037] The water flow energy difference refers to the effective energy difference between the water flow from the water source to the turbine inlet. It is a weighted calculation result of the height difference (i.e., the vertical distance difference between the starting point of the water flow and the turbine inlet) and the velocity difference (i.e., the average difference between the water flow velocities at different locations). The height between the starting point of the water flow and the turbine inlet can be obtained by a water level sensor, and the water flow velocity at different locations can be obtained by a flow velocity sensor. The water flow energy difference is used to reflect the impact of water flow stability on the operation of the unit.

[0038] The discharge pressure value is the pressure at the tailwater discharge outlet, which can be obtained through a pressure sensor and is used to reflect blockages in the drainage system.

[0039] The discharge chromaticity value is the color concentration of the effluent, which can be measured by a colorimeter (its working principle is: comparing the measured absorption spectrum with the reference value of the standard chromaticity unit, and converting it into a specific chromaticity unit according to the absorption situation through the built-in calculation model). It is used to reflect the degree of pollution of the discharged effluent.

[0040] The sediment content in the discharge is the concentration of suspended particulate matter in the effluent, which can be obtained through a sediment content sensor. A high sediment content will lead to water quality deterioration.

[0041] The emission dissolved gas ratio is the average of the concentrations of dissolved gases (such as carbon dioxide, nitrogen, methane, etc.). The concentration of each dissolved gas can be obtained by electrochemical sensors and is used to reflect the potential impact of emissions on the surrounding environment. For example, a high dissolved gas ratio can have a negative impact on aquatic organisms and water quality.

[0042] The tailwater discharge pollution index is obtained by acquiring the dissolved oxygen concentration, ammonia nitrogen concentration, and heavy metal concentration of the discharged water at each time point, and then performing a weighted average to obtain the tailwater discharge pollution index.

[0043] Specifically, such as Figure 2As shown, the specific steps for obtaining the operational stability index of the hydro-generator unit to be braked at each time point are as follows: Obtain the reference values ​​for the generator unit's rotor temperature, output torque, shaft pressure, rotor axial force, water flow pressure disturbance intensity, turbulence intensity, and head; [Further details on these parameters are needed for accurate translation.] A comprehensive analysis was conducted to obtain the unit fault index of the hydro-generator unit to be braked at each time point. Furthermore, a comprehensive analysis was performed on the reference values ​​of water flow pressure disturbance intensity, turbulence intensity, and head of the hydro-generator unit to be braked, as well as the water flow pressure disturbance intensity, turbulence intensity, and water flow energy difference at each time point, to obtain the water flow stability index of the hydro-generator unit to be braked at each time point. Finally, a comprehensive analysis of the unit fault index and water flow stability index of the hydro-generator unit to be braked at each time point yielded the operational stability index of the hydro-generator unit to be braked at each time point.

[0044] The method for obtaining the reference value of the rotor temperature of the hydro-generator unit to be braked is as follows: obtain the historical rotor temperature values ​​of the hydro-generator unit at several historical time points, perform moving average processing, and obtain the reference value of the rotor temperature.

[0045] Furthermore, the reference values ​​for output torque, shaft diameter pressure, unit rotor axial force, water flow pressure disturbance intensity, turbulence intensity, head, and unit rotor temperature are obtained in the same way.

[0046] The specific formulas for calculating the unit fault index and operating stability index of the hydro-generator unit to be braked at each time point are as follows: ;in, The first hydro-generator unit to be braked Unit failure index at a given time point The first hydro-generator unit to be braked Unit rotor temperature values ​​at each time point This is the reference value for the rotor temperature of the hydro-generator unit to be braked. The rotor temperature coefficient is stored in the database. The first hydro-generator unit to be braked The output torque value at each time point This is a reference value for the output torque of the hydro-generator unit to be braked. The torque coefficient is stored in the database. The first hydro-generator unit to be braked Shaft diameter pressure values ​​at each time point Reference value for shaft diameter pressure of the hydro-generator unit to be braked. The shaft diameter coefficient is stored in the database. The first hydro-generator unit to be braked The axial force value of the unit rotor at each time point This is a reference value for the axial force of the turbine generator unit rotor before braking. The axial force coefficients are stored in the database. The first hydro-generator unit to be braked The operational stability index at each point in time. The load factor is stored in the database. The first hydro-generator unit to be braked The water flow stability index at a given time point The flow coefficients are stored in the database. , 1, 2, 3, ... , The number of time points, It is a natural constant, and in this implementation example, it takes the value 2.71.

[0047] It should be explained that the calculation logic and formula for the water flow stability index and the unit failure index of the hydro-turbine generator unit at each time point before braking are consistent.

[0048] , , , The following steps can be taken: First, obtain historical data and determine the initial influence weights of each variable on the unit failure index through statistical regression analysis. Then, use sensitivity analysis to adjust the range of coefficient values ​​to evaluate the stability and applicability of these parameters to the formula output. Next, further fit the weights through model optimization (such as machine learning algorithms) to ensure that the formula can accurately reflect the actual unit failures.

[0049] , The following steps can be taken to obtain the following: Read the unit fault index and water flow stability index of the braking hydro-generator unit at each time point (it should be noted that the unit fault index and water flow stability index are dimensionless values ​​and can be calculated directly), perform mean analysis, perform summation analysis based on the mean analysis results to obtain the load sum value, perform ratio analysis between the mean analysis results and the load sum value respectively, and use the ratio analysis results as the corresponding coefficients.

[0050] This implementation plan combines mechanical and hydrodynamic factors to comprehensively cover the main factors affecting the operational stability of hydro-generator units, thus avoiding the limitations of a single indicator and ensuring the comprehensiveness and accuracy of the unit's operational stability evaluation. By analyzing the operating parameters at each time point, the plan provides real-time assessment of unit operational stability, offering a basis for rapid response. Using reference values ​​(such as the moving average of historical unit operating data) as a benchmark, the plan effectively compares the current operating status, ensuring the relativity and scientific nature of the evaluation indicators and making abnormal fluctuations more intuitive. Finally, through statistical regression analysis and sensitivity analysis of historical data, the plan ensures that each coefficient in the formula is derived from actual operating data, accurately reflecting the impact of each parameter on unit operational stability. Furthermore, by utilizing sensitivity analysis and model optimization (such as machine learning algorithms), the plan dynamically adjusts the weights for different hydro-generator units or operating conditions, enhancing the formula's universality and adaptability. This avoids the bias caused by fixed coefficients and improves the accuracy of the algorithm under different environments and operating conditions.

[0051] Specifically, the steps for obtaining the environmental correction index of the hydro-generator unit to be braked at each time point are as follows: Obtain the external humidity reference value and external temperature reference value of the hydro-generator unit to be braked; normalize the external humidity reference value, external temperature reference value, and external humidity, external temperature, external electromagnetic interference, and external suspended matter concentration values ​​of the hydro-generator unit to be braked, as well as at each time point (i.e., remove units); and comprehensively analyze the normalized external humidity reference value, external temperature reference value, and external humidity, external temperature, external electromagnetic interference, and external suspended matter concentration values ​​of the hydro-generator unit to be braked, to obtain the environmental correction index of the hydro-generator unit to be braked at each time point.

[0052] The specific formula for calculating the environmental correction index of the hydro-generator unit to be braked at each time point is as follows: ;in, The first of the hydro-generator units to be braked Environmental correction index at a given time point The first hydro-generator unit to be braked External humidity values ​​at each time point The first hydro-generator unit to be braked External humidity reference values ​​at specific time points The humidity coefficient is stored in the database. The first hydro-generator unit to be braked External temperature values ​​at each time point This is the external temperature reference value for the hydro-generator unit to be braked. The temperature coefficients stored in the database. The first hydro-generator unit to be braked External electromagnetic interference values ​​at each time point These are the interference coefficients stored in the database. The first hydro-generator unit to be braked External suspended matter concentration values ​​at each time point The suspended matter coefficient is stored in the database. The interaction coefficients are stored in the database. 1, 2, 3, ... , The number of time points.

[0053] It needs to be explained that in the formula... The superposition effect of external humidity, external temperature, external electromagnetic interference, and external suspended matter concentration values ​​after normalization is used to prevent the environmental correction index from being too high or too low.

[0054] and , , , , Specifically, the following steps can be taken: obtain historical environmental time series data, perform statistical regression analysis, quantify the specific impact of each factor on environmental modification, and thus fit the initial weight values. Secondly, use sensitivity analysis to adjust the range of values ​​of the corresponding coefficients to ensure the stability and rationality of the model. Based on the actual situation, correct and optimize the initially fitted coefficients, and finally determine the corresponding coefficient values.

[0055] This implementation plan considers and comprehensively analyzes various external environmental factors (such as humidity, temperature, electromagnetic interference, and suspended solids concentration) to effectively assess the degree of interference of environmental conditions on unit performance. This avoids the bias caused by a single indicator, making the environmental correction index results more representative and applicable, and thus more comprehensively reflecting the impact of the external environment on unit operation. Furthermore, normalization eliminates unit differences between different physical quantities, allowing data to be compared and analyzed on a unified scale. This reduces computational complexity and improves data comparability and analytical accuracy. Secondly, the environmental correction index is calculated at each time point. Based on real-time monitoring data, the dynamic changes in the external environment are flexibly reflected, thereby optimizing the unit's control strategy, improving the unit's adaptability to environmental changes, reducing operational risks, and providing support for intelligent control. Finally, statistical regression analysis of historical time-series data is introduced to quantify the specific impact of each factor on environmental correction from historical data, and initial weight values ​​are fitted. Based on real data analysis, the interference of human subjective judgment is reduced. Finally, by accurately calculating the environmental correction index, the unit's operating parameters are optimized to avoid operational anomalies or equipment damage, thereby improving the safety and reliability of unit operation and reducing the probability of failure.

[0056] Specifically, the steps for obtaining the emission anomaly index of the hydro-generator unit to be braked at each time point are as follows: Obtain the emission pressure reference value, emission color reference value, emission dissolved gas ratio reference value, and emission pollution reference index of the hydro-generator unit to be braked; and standardize (i.e., remove units) the emission pressure reference value, emission color reference value, emission dissolved gas ratio reference value, emission pollution reference index of the hydro-generator unit to be braked, as well as the emission pressure value, emission color value, emission sediment content value, emission dissolved gas ratio, and emission pollution index at each time point; and comprehensively analyze the standardized emission pressure reference value, emission color reference value, emission dissolved gas ratio reference value, emission pollution reference index of the hydro-generator unit to be braked, as well as the emission pressure value, emission color value, emission sediment content value, emission dissolved gas ratio, and emission pollution index at each time point to obtain the emission anomaly index of the hydro-generator unit to be braked at each time point.

[0057] The reference values ​​for emission pressure, emission color, emission dissolved gas ratio, and emission pollution index of the hydro-generator unit at each time point before braking are obtained in the same way as the reference values ​​for the unit's rotor temperature.

[0058] The specific formula for calculating the emission anomaly index of the hydro-generator unit to be braked at each time point is as follows: ;in, The first hydro-generator unit to be braked Anomaly index of emissions at each time point, The first standardized hydro-generator unit to be braked Emission pressure values ​​at specific time points This refers to the standardized reference value for the discharge pressure of the hydro-generator unit awaiting braking. The emission pressure coefficients are stored in the database. The first standardized hydro-generator unit to be braked Emission chromaticity values ​​at each time point The emission color reference value of the hydro-generator unit to be braked after standardization treatment. These are the chromaticity coefficients stored in the database. The first standardized hydro-generator unit to be braked Sediment content values ​​at each time point The sand content coefficient is stored in the database. The first standardized hydro-generator unit to be braked The ratio of dissolved gases emitted at each time point This refers to the reference value for the dissolved gas ratio in the emissions of the standardized hydro-generator unit awaiting braking. The dissolved gas coefficients are stored in the database. The first standardized hydro-generator unit to be braked Emissions pollution index at a specific time point The emission pollution reference index for the standardized hydro-generator unit awaiting braking is as follows: The pollution coefficient is stored in the database. , 1, 2, 3, ... , The number of time points.

[0059] It needs to be explained that, , , , , The following steps can be taken to obtain the following: Read the sediment content values ​​of the hydro-generator unit to be braked at each time point after standardization, perform mean analysis to obtain the mean sediment content, and read the reference values ​​of emission pressure, emission color, emission dissolved gas ratio, and emission pollution index of the hydro-generator unit to be braked after standardization. At the same time, combine the mean sediment content with the summation analysis to obtain the anomaly sum value. Then, perform a ratio analysis between the reference values ​​of emission pressure, emission color, emission sediment content, emission dissolved gas ratio, and emission pollution index of the hydro-generator unit to be braked after standardization and the anomaly sum value, and use the ratio analysis results as the corresponding coefficients.

[0060] The following is a specific implementation example for calculating the emission anomaly index of the hydro-generator unit to be braked at each time point. The available data includes emission pressure values, emission color values, emission sediment content values, emission dissolved gas ratios, and emission pollution indices at five time points. Specific data are shown in Tables 1 and 2.

[0061] Table 1. Data Example of Tailwater Discharge Timing Data for Hydro-generator Units to be Braked

[0062] Discharge pressure value (kPa) Emission color value (CU) Sediment content in emissions (mg / L) Dissolved gas emission ratio Emission pollution index (mg / L) Time point 1 120.00 10.00 15.00 0.04 0.03 Time point 2 125.00 10.60 16.50 0.05 0.05 Time point 3 129.00 11.20 17.60 0.04 0.06 Time point 4 126.00 10.40 16.36 0.05 0.05 Time point 5 121.00 10.60 15.69 0.05 0.04

[0063] Table 2. Example of reference data for tailwater discharge timing data of hydro-generator units to be braked.

[0064] Emission pressure value (g / cm3) Emission color value (mm) Dissolved gas emission ratio Pollution index (°C) 110.00 10.50 0.04 0.03

[0065] Standardize the data in Tables 1 and 2 respectively to obtain the following data examples:

[0066] Table 3. Data Example of Tailwater Discharge Timing Data of Hydro-generator Units to be Braked after Standardization Processing

[0067] Standardized emission pressure values Standardized emission color values Standardized treatment of sediment content in emissions Standardized treatment of dissolved gas ratio in emissions Standardized emission pollution index Time point 1 0.54 0.23 0.38 0.26 0.59 Time point 2 0.57 0.25 0.42 0.30 0.62 Time point 3 0.61 0.31 0.45 0.26 0.66 Time point 4 0.58 0.23 0.40 0.30 0.62 Time point 5 0.55 0.24 0.39 0.30 0.60

[0068] Table 4. Example of reference data for the tailwater discharge timing data of the hydro-generator unit to be braked after standardization.

[0069] Standardized emission pressure values Standardized emission color values Standardized treatment of dissolved gas ratio in emissions Standardized emission pollution index 0.54 0.24 0.26 0.59

[0070] The emission pressure coefficient stored in the database is approximately 0.26.

[0071] The chromaticity coefficient stored in the database is approximately 0.13.

[0072] The sand content coefficient stored in the database is approximately 0.20.

[0073] The dissolved gas coefficient stored in the database is approximately 0.12.

[0074] The pollution coefficient stored in the database is approximately 0.29.

[0075] Substituting the above coefficients and the data from Tables 3 and 4 into the specific formula for calculating the emission anomaly index of the hydro-generator unit to be braked at each time point, we obtain:

[0076] The emission anomaly index of the hydro-generator unit at time point 1 before braking = ≈0.75;

[0077] The emission anomaly index of the hydro-generator unit at time point 2 before braking = ≈0.61;

[0078] The emission anomaly index of the hydro-generator unit at time point 3 before braking = ≈0.69;

[0079] The emission anomaly index of the hydro-generator unit at time point 4 before braking = ≈0.65;

[0080] The emission anomaly index of the hydro-generator unit at time point 5 before braking = ≈0.64.

[0081] This implementation plan comprehensively analyzes multiple indicators such as emission pressure, color, dissolved gas ratio, sediment content, and pollution index to fully assess the emissions of the hydro-generator unit. This allows for accurate identification of the true cause of emission anomalies, enabling precise braking. Furthermore, the standardization of emission indicators eliminates unit differences between different physical quantities, improving the comparability of data analysis. Data from different dimensions is converted into unitless standard values, facilitating comparison and analysis within the same calculation model and avoiding calculation deviations caused by unit differences. This results in more accurate emission anomaly index results. Simultaneously, the emission anomaly index is calculated based on each time point, enabling real-time monitoring of emission status and rapid response to sudden anomalies. Secondly, comprehensive analysis of multiple reference values ​​and actual values ​​more accurately assesses emission anomalies. Reference values ​​are used as benchmarks to help determine whether the actual emission status deviates from the normal range, thus determining whether the unit needs braking. Finally, combining time-point data allows analysis of the persistence of emission anomalies, enabling timely detection and handling of anomalies. This reduces losses caused by equipment overload or abnormal operation, extending equipment lifespan.

[0082] Specifically, the steps to obtain the comprehensive braking index change rate of the hydro-generator unit to be braked are as follows: Analyze the change of braking index of the hydro-generator unit to be braked at each time point to obtain the braking index change rate of several adjacent time points of the hydro-generator unit to be braked; and conduct a comprehensive analysis of the braking index change rate of several adjacent time points of the hydro-generator unit to be braked to obtain the comprehensive braking index change rate of the hydro-generator unit to be braked.

[0083] The formulas for calculating the rate of change of braking index and the rate of change of comprehensive braking index at several adjacent time points of the hydro-generator unit to be braked are as follows: ;in, The first hydro-generator unit to be braked Rate of change of braking index at adjacent time points in a group The first hydro-generator unit to be braked Braking index at each time point The first hydro-generator unit to be braked Braking index at each time point The rate of change of the comprehensive braking index of the hydro-generator unit to be braked. The first hydro-generator unit to be braked Weighting coefficients for adjacent time points in a group The first hydro-generator unit to be braked Rate of change of braking index at adjacent time points in a group The first hydro-generator unit to be braked Weighting coefficients for adjacent time points in a group , 1, 2, 3, ... , The number of adjacent time points. 1, 2, 3, ... , The number of time points, and 1.

[0084] It needs to be explained that, , The following steps can be used to obtain: [The text abruptly ends here, likely due to an incomplete sentence or a formatting , The summation analysis of the rate of change of the braking index at adjacent time points in the group yields the results of the first... The group braking index changes and values, then the first , The rate of change of the braking index at adjacent time points in the group were respectively compared with the first The changes and values ​​of the group braking index are analyzed by proportion, and the results of the proportion analysis are the corresponding weighting coefficients.

[0085] In this implementation scheme, the braking performance trend of the hydro-generator unit is dynamically monitored by calculating and comprehensively analyzing the rate of change of the braking index at different time points. Short-term fluctuations are captured based on the rate of change of adjacent time points, reflecting the real-time operating status of the equipment. By calculating the comprehensive rate of change, it is possible to identify whether braking is required. By calculating weighting coefficients, the rate of change of the comprehensive braking index is stratified according to the rate of change, highlighting the impact of key time periods. At the same time, weighted comprehensive analysis of multiple sets of rates of change can effectively smooth the deviation caused by short-term abnormal fluctuations. Finally, by analyzing multiple time points and the number of adjacent time points, a more comprehensive rate of change of the braking index is obtained. By analyzing the rate of change of multiple time points, the results are avoided due to abnormal data in a single time period, thereby improving the robustness and reliability of the results.

[0086] Specifically, the steps for taking corresponding braking measures based on the comparative analysis results are as follows: If the rate of change of the comprehensive braking index of the hydro-generator unit to be braked is lower than the lower limit (i.e., minimum value) of the preset comprehensive braking index change rate threshold range, the hydro-generator unit will not be braked; if the rate of change of the comprehensive braking index of the hydro-generator unit to be braked is within the preset comprehensive braking index change rate threshold range, the first braking measure is taken (i.e., slow braking, adjusting the guide vane opening, gradually reducing the water flow rate; slowing down the rate of decrease in unit speed to avoid damage to the equipment from impact shutdown); if the rate of change of the comprehensive braking index of the hydro-generator unit to be braked is higher than the upper limit (i.e., maximum value) of the preset comprehensive braking index change rate threshold range, the second braking measure is taken (i.e., rapid braking, closing the guide vanes, cutting off the water flow channel; activating a rapid braking device, such as electromagnetic braking, to force shutdown; simultaneously adjusting the tailwater discharge system to rapidly reduce tailwater pressure and avoid collapse).

[0087] In this implementation plan, by conducting a graded analysis of the comprehensive braking index change rate, different braking strategies can be adopted to accurately match the braking scheme to the actual situation. For example, slow braking within the threshold range can reduce equipment load and avoid mechanical shock caused by excessively rapid shutdown. When the change rate exceeds the upper limit of the threshold, rapid braking measures are taken to prevent serious failures or safety accidents. Secondly, based on the real-time analysis of the comprehensive braking index change rate, the system can quickly respond to changes in equipment operating status, ensure stable system operation, adapt to rapid changes in operating status, and take appropriate measures in a timely manner to prevent the equipment status from evolving from a minor abnormality to a serious failure. Finally, by adopting different levels of braking measures, the system can maximize equipment operating efficiency while ensuring safety. For example, slow braking is performed when the change rate is within the threshold range to achieve equipment protection without affecting operating efficiency. This allows for the rational selection of braking measures, thereby reducing maintenance and repair costs caused by excessive braking or fault shutdown.

[0088] Please see Figure 3 This invention provides a technical solution: a braking system for a hydro-generator unit, comprising: a data acquisition module, a data analysis module, a comprehensive analysis module, and a braking judgment module; the data acquisition module is used to continuously acquire braking time-series data when the hydro-generator unit is discharging tailwater, the braking time-series data including operating time-series data, environmental time-series data, and tailwater discharge time-series data; the data analysis module is used to perform data analysis on the braking time-series data of the hydro-generator unit to be braked, to obtain the operating stability index, environmental correction index, and discharge anomaly index of the hydro-generator unit to be braked at each time point, and to perform comprehensive analysis to obtain the braking index of the hydro-generator unit to be braked at each time point; the comprehensive analysis module is used to perform comprehensive analysis on the braking index of the hydro-generator unit to be braked at each time point, to obtain the comprehensive braking index change rate of the hydro-generator unit to be braked; the braking judgment module is used to compare and analyze the comprehensive braking index change rate of the hydro-generator unit to be braked with a preset comprehensive braking index change rate threshold range, and to take corresponding braking measures based on the comparison and analysis results.

[0089] In summary, this application has at least the following effects:

[0090] By continuously acquiring braking timing data and conducting comprehensive analysis when the hydro-generator unit is discharging tailwater, the braking index and its rate of change can be accurately obtained at each time point, thereby comprehensively reflecting the operating status of the hydro-generator unit. This allows for dynamic capture of subtle changes under complex operating conditions and avoids over- or under-braking control, thereby improving the accuracy and real-time performance of braking, while ensuring the operational safety and stability of the hydro-generator unit.

[0091] By analyzing multidimensional data on operating sequence, environmental time series, and tailwater discharge time series, a comprehensive calculation based on the operating stability index, environmental correction index, and discharge anomaly index is achieved. This improves the scientific nature of braking decisions and effectively addresses complex situations such as environmental changes and discharge anomalies, thereby reducing equipment wear and extending the service life of the hydro-generator unit.

[0092] By comparing the rate of change of the comprehensive braking index with the threshold range, different braking measures can be flexibly adopted to ensure that the braking method can match the actual operating conditions. This reduces braking delays or misjudgments caused by environmental anomalies or emission fluctuations, optimizes operating efficiency, and provides an efficient solution for braking of hydro-generator units under complex operating conditions.

[0093] Through continuous data acquisition by the data acquisition module, precise data processing by the analysis module, and the synergistic effect of the comprehensive analysis module and the braking judgment module, closed-loop control of the intelligent braking process is achieved. This results in higher adaptability and scalability, and customized adjustments can be made according to the characteristics or operating environment of different hydro-generator units, thereby meeting the braking requirements under various complex working conditions and significantly improving the breadth and flexibility of applications.

[0094] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0095] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method of braking a hydroelectric generating unit, characterized by, Includes the following steps: When the hydro-generator unit is in the tailwater discharge stage, braking timing data is continuously acquired. The braking timing data includes running timing data, environmental timing data, and tailwater discharge timing data. The runtime timing data includes the unit rotor temperature, output torque, shaft diameter pressure, unit rotor axial force, water flow pressure disturbance intensity, turbulence intensity, and water flow energy difference at each time point. The environmental timing data includes the external humidity, external temperature, external electromagnetic interference, and external suspended solids concentration at each time point. The tailwater discharge timing data includes the discharge pressure, discharge color, discharge sediment content, discharge dissolved gas ratio, and discharge pollution index at each time point. Data analysis was performed on the braking time sequence data of the hydro-generator unit to be braked to obtain the operating stability index, environmental correction index, and emission anomaly index of the hydro-generator unit to be braked at each time point. A comprehensive analysis was then performed to obtain the braking index of the hydro-generator unit to be braked at each time point. The specific steps for obtaining the operational stability index of the hydro-generator unit to be braked at each time point are as follows: Obtain reference values ​​for the rotor temperature, output torque, shaft diameter pressure, rotor axial force, water flow pressure disturbance intensity, turbulence intensity, and head of the hydro-generator unit to be braked; By comprehensively analyzing the reference values ​​of rotor temperature, output torque, shaft pressure, and axial force of the hydro-generator unit to be braked, as well as the rotor temperature, output torque, shaft pressure, and axial force values ​​at each time point, the unit's fault index at the corresponding time point is obtained. The reference values ​​of water flow pressure disturbance intensity, turbulence intensity, and head of the hydro-generator unit to be braked, as well as the water flow pressure disturbance intensity, turbulence intensity, and water flow energy difference at each time point, are comprehensively analyzed to obtain the water flow stability index at the corresponding time point. The unit fault index and water flow stability index of the hydro-generator unit to be braked are comprehensively analyzed at each time point to obtain its corresponding operational stability index. The specific steps for obtaining the environmental correction index of the hydro-generator unit to be braked at each time point are as follows: Obtain the external humidity reference value and external temperature reference value of the hydro-generator unit to be braked; The external humidity reference value, external temperature reference value, and external humidity value, external temperature value, external electromagnetic interference value, and external suspended matter concentration value of the hydro-generator unit to be braked are normalized. The normalized external humidity reference value, external temperature reference value, external humidity value, external electromagnetic interference value, and external suspended matter concentration value of the hydro-generator unit to be braked are comprehensively analyzed to obtain the environmental correction index at the corresponding time point. The specific steps for obtaining the emission anomaly index of the hydro-generator unit to be braked at each time point are as follows: Obtain reference values ​​for the discharge pressure, discharge color, discharge dissolved gas ratio, and discharge pollution index of the hydro-generator unit to be braked; The emission pressure reference value, emission color reference value, emission dissolved gas ratio reference value, emission pollution reference index of the hydro-generator unit to be braked, as well as the emission pressure value, emission color value, emission sediment content value, emission dissolved gas ratio, and emission pollution index at each time point are standardized. The emission pressure reference value, emission color reference value, emission dissolved gas ratio reference value, emission pollution reference index of the standardized hydro-turbine generator unit to be braked, as well as the emission pressure value, emission color value, emission sediment content value, emission dissolved gas ratio, and emission pollution index at each time point, are comprehensively analyzed to obtain the emission anomaly index at the corresponding time point. The specific formula for calculating the unit failure index of the hydro-generator unit under braking at each time point is as follows: ; in, , , , , The following are the hydro-generator units to be braked in sequence. The unit's fault index, rotor temperature, output torque, shaft pressure, and rotor axial force at each time point are recorded. , , , The reference values, in order, are the rotor temperature, output torque, shaft diameter pressure, and rotor axial force of the hydro-generator unit to be braked. , , , The parameters stored in the database are, in order: rotor temperature coefficient, torque coefficient, shaft diameter coefficient, and axial force coefficient. By comprehensively analyzing the braking index of the hydro-generator unit to be braked at each time point, the rate of change of the comprehensive braking index of the hydro-generator unit to be braked is obtained. The comprehensive braking index change rate of the hydro-generator unit to be braked is compared and analyzed with the preset comprehensive braking index change rate threshold range, and corresponding braking measures are taken based on the comparison and analysis results. The specific formula for calculating the braking index of the hydro-generator unit to be braked at each time point is as follows: ； in, The first hydro-generator unit to be braked Braking index at each time point The first hydro-generator unit to be braked The operational stability index at each point in time. The operating coefficients are stored in the database. The first hydro-generator unit to be braked Environmental correction index at a given time point These are environmental coefficients stored in the database. The first hydro-generator unit to be braked Anomaly index of emissions at each time point, The emission coefficients are stored in the database. , 1, 2, 3, ... , The number of time points, It is a natural constant.

2. The braking method for a hydro-generator set according to claim 1, characterized in that, The specific formula for calculating the operating stability index of the hydro-generator unit to be braked at each time point is as follows: ;in, The first hydro-generator unit to be braked The operational stability index at each point in time. The load factor is stored in the database. The first hydro-generator unit to be braked Unit failure index at a given time point The first hydro-generator unit to be braked The water flow stability index at a given time point The flow coefficients are stored in the database. , 1, 2, 3, ... , The number of time points, It is a natural constant.

3. The braking method for a hydro-generator set according to claim 1, characterized in that, The specific formula for calculating the emission anomaly index of the hydro-generator unit to be braked at each time point is as follows: ; in, The first hydro-generator unit to be braked Anomaly index of emissions at each time point, The first standardized hydro-generator unit to be braked Emission pressure values ​​at specific time points This refers to the standardized reference value for the discharge pressure of the hydro-generator unit awaiting braking. The emission pressure coefficients are stored in the database. The first standardized hydro-generator unit to be braked Emission chromaticity values ​​at each time point The emission color reference value of the hydro-generator unit to be braked after standardization treatment. These are the chromaticity coefficients stored in the database. The first standardized hydro-generator unit to be braked Sediment content values ​​at each time point The sand content coefficient is stored in the database. The first standardized hydro-generator unit to be braked The ratio of dissolved gases emitted at each time point This refers to the reference value for the dissolved gas ratio in the emissions of the standardized hydro-generator unit awaiting braking. The dissolved gas coefficients are stored in the database. The first standardized hydro-generator unit to be braked Emissions pollution index at a specific time point The emission pollution reference index for the standardized hydro-generator unit awaiting braking is as follows: The pollution coefficient is stored in the database. , 1, 2, 3, ... , The number of time points.

4. The braking method for a hydro-generator set according to claim 1, characterized in that, The specific steps for obtaining the rate of change of the comprehensive braking index of the hydro-generator unit to be braked are as follows: The braking index of the hydro-generator unit to be braked is analyzed at each time point to obtain the rate of change of braking index of the hydro-generator unit at several adjacent time points. Furthermore, a comprehensive analysis was conducted on the rate of change of braking index at several adjacent time points of the hydro-generator unit to be braked, resulting in the comprehensive rate of change of braking index of the hydro-generator unit to be braked.

5. The braking method for a hydro-generator set according to claim 1, characterized in that, The specific steps for taking corresponding braking measures based on the comparative analysis results are as follows: If the rate of change of the comprehensive braking index of the hydro-generator unit to be braked is lower than the lower limit of the preset threshold range of the rate of change of the comprehensive braking index, the hydro-generator unit will not brake. If the rate of change of the comprehensive braking index of the hydro-generator unit to be braked is within the preset threshold range of the rate of change of the comprehensive braking index, then the first braking measure shall be taken. If the rate of change of the comprehensive braking index of the hydro-generator unit to be braked is higher than the upper limit of the preset threshold range of the rate of change of the comprehensive braking index, then a second braking measure shall be taken.

6. A braking system for a hydro-generator set, employing the braking method for a hydro-generator set according to any one of claims 1-5, characterized in that, include: Data acquisition module, data analysis module, comprehensive analysis module, braking judgment module; The data acquisition module is used to continuously acquire braking timing data when the hydro-generator unit is discharging tailwater. The braking timing data includes running timing data, environmental timing data, and tailwater discharge timing data. The data analysis module is used to perform data analysis on the braking time sequence data of the hydro-generator unit to be braked, to obtain the operating stability index, environmental correction index, and emission anomaly index of the hydro-generator unit to be braked at each time point, and to perform comprehensive analysis to obtain the braking index of the hydro-generator unit to be braked at each time point. The comprehensive analysis module is used to perform a comprehensive analysis of the braking index of the hydro-generator unit to be braked at each time point, and to obtain the comprehensive braking index change rate of the hydro-generator unit to be braked. The braking judgment module is used to compare and analyze the rate of change of the comprehensive braking index of the hydro-generator unit to be braked with the preset threshold range of the rate of change of the comprehensive braking index, and take corresponding braking measures based on the comparison and analysis results.

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