Online test method and system for maximum output and temperature rise of pumped storage unit

Abstract

The invention provides a pumped storage unit maximum output and temperature rise online test method and system, and the method comprises the steps: obtaining the operation condition data of a pumped storage unit, and screening out the maximum output record of a power generation condition; screening out a maximum output record of which the operation time length is greater than a set time length, calculating the deviation degree of active power, reactive power and stator current in the record in the time length, if the deviation degree is greater than a threshold value, judging that the record is an invalid experiment record, otherwise, judging that the record is an effective experiment record; calculating the temperature rise of each measuring point in the effective experiment record, if the temperature rise of all the measuring points is smaller than or equal to a temperature threshold value, judging that the experiment record reaches a thermal steady state, and recording the final temperature and the temperature rise value of each measuring point; calculating the maximum value of the stability index of each measuring point on the experimental record reaching the steady state, comparing the maximum value with a standard value, and if all the indexes are in an allowable range, considering that the unit operates stably under the maximum output working condition; and generating a test report including the final temperature rise and stability of each test point in the test condition.

Description

TECHNICAL FIELD

[0001] The present application relates to a pumped storage unit maximum output and temperature rise online test method and system, belonging to the field of performance test of hydroelectric generating unit. BACKGROUND

[0002] Currently, there are some online test systems for performance test of hydroelectric generating unit, mainly applied to conventional hydroelectric generating unit. The technical features of these systems mainly reflect in the following aspects:

[0003] Data acquisition and integration: the system reads the real-time operation data of the hydroelectric generating unit from multiple sources such as power station computer monitoring system and unit condition monitoring system through interface. These data include basic information for efficiency test (such as upstream and downstream water level, power, flow, guide vane opening, etc.) and basic information for stability test (such as vibration, swing, pressure fluctuation of each part of the unit, etc.).

[0004] Steady state condition identification and screening: in order to ensure the effectiveness of test data, the system adopts steady state condition identification algorithm. A typical method is to judge whether the deviation between actual load and set load of the unit within a predetermined time (for example, 10 minutes) is less than a smaller threshold (for example, 3%) continuously. If the condition is met, it is considered that the period is a stable condition, and the operation data of a period (for example, 5 minutes in the middle) is intercepted as an effective test data point.

[0005] Performance index calculation and analysis: based on the screened steady state condition data, the system calculates the unit efficiency under different working condition points according to the head, flow and related efficiency calculation formula. By combining the efficiency data points under different heads, the efficiency characteristic curve of the unit is finally formed, so as to complete the efficiency test.

[0006] Although the above online test system has achieved certain application in conventional hydroelectric generating unit, it has significant limitations in function and applicability, which cannot meet the special test requirements of pumped storage unit. The specific problems are as follows:

[0007] Function loss: the existing system mainly focuses on efficiency and stability test, and completely lacks the function of online test and evaluation of the two key performance indicators of maximum output and temperature rise of the unit. Maximum output test and temperature rise test are mandatory test items for testing the design, manufacturing and installation quality of the unit and ensuring the safe operation of the unit, which still rely on traditional and costly offline test.

[0008] Object not applicable: the operation mode of pumped storage unit is much more complex than that of conventional hydroelectric unit. In addition to power generation conditions, it also includes pumping, power generation and phase modulation, pumping and phase modulation, and various transition conditions. The conversion between working conditions is frequent, the load regulation range is large and the speed is fast, which leads to the opportunity of long-term stable operation of the unit in a certain specific working condition is much less than that of conventional unit.

[0009] Condition recognition is difficult: the existing condition recognition method based on "long-term stable load" is too strict for pumped storage units with variable working conditions, and it is difficult to effectively capture the valuable data window that meets the test conditions. Especially for maximum output and temperature rise test, it has special requirements for the stability and duration of the working condition, and the existing technology cannot accurately identify and define it. This leads to the application gap of online test method in the field of pumped storage units. SUMMARY

[0010] The present application provides a pumped storage unit maximum output and temperature rise online test method and system, which can complete the maximum output and temperature rise test online for pumped storage units, solving the problems disclosed in the background art.

[0011] To solve the above technical problems, the technical solution adopted by the present application is:

[0012] A pumped storage unit maximum output and temperature rise online test method:

[0013] Obtain pumped storage unit operation condition data, select the maximum output record of power generation condition, and record the corresponding operation duration, and intercept the relevant measuring point data;

[0014] Select the maximum output record with an operation duration higher than the set duration, calculate the deviation of active power, reactive power and stator current in the duration, and if the deviation is greater than the threshold, it is judged as an invalid experimental record, otherwise it is an effective experimental record;

[0015] Calculate the temperature rise of each measuring point in the effective experimental record, and if the temperature rise of all measuring points is less than or equal to the temperature threshold, it is judged that the experimental record has reached thermal steady state, and the final temperature and temperature rise value of each measuring point are recorded;

[0016] Calculate the maximum value of each measuring point stability index on the experimental record that reaches steady state, and compare it with the standard value, if all indexes are within the allowed range, it is considered that the unit is running stably under maximum output condition;

[0017] Generate a test report including the final temperature rise and stability of each measuring point of the test condition.

[0018] Further, the method for selecting the maximum output record of power generation condition includes:

[0019] Only the operating condition of generating power and actual unit output Pt ≥ Pr rated output is considered. During power verification, if Pt < 0, it indicates the unit is in pumping / pumping phase-changing mode, and the data for this operation is invalid. If Pt ≤ 0.1*Pr, and the unit is in generating phase-changing mode, this is a generating phase-changing record, and the data is invalid. If the unit is in generating mode, and simultaneously... If Pt > Pr, then it is marked as the maximum output record of a single power generation operation.

[0020] Furthermore, methods for selecting the maximum output records under power generation conditions also include:

[0021] Extract the maximum output record for each power generation condition, calculate the operating head H, where H = upstream water level - downstream water level. If H < Hr, where Hr is the rated head, then this record is considered an error and deleted.

[0022] Furthermore, the deviation is calculated as follows:

[0023] ;

[0024] In the formula, P tmax P represents the maximum active power value in this operation record. tave This is the average value.

[0025] Furthermore, the methods for calculating the temperature rise at each measuring point in the valid experimental records include:

[0026] The temperature at the measuring point corresponding to the end time of the experiment is recorded as T. end Iterate through the historical data of the measurement points to find the temperature T corresponding to the last 60 minutes before the end of the recording. end-60 If no temperature data is available for the corresponding timestamp, linear interpolation is used to obtain the corresponding temperature value, and the temperature difference ΔT at each measuring point is calculated. end .

[0027] Furthermore, methods for calculating the temperature rise at each measuring point in valid experimental records also include:

[0028] Measure the voltage U on the rotor slip ring f Simultaneously, the rotor current I is measured at the shunt. f The average temperature rise ΔT of the rotor winding was calculated. end ';

[0029] ;

[0030] In the formula, R1 is the cold-state DC resistance of the rotor winding in Ω. R2 is the hot DC resistance of the rotor winding in Ω; t1 is the winding temperature when R1 is measured in °C; t2 is the average air cooler outlet temperature corresponding to R2 in °C.

[0031] The formula for correcting the temperature rise of the stator winding is:

[0032] ;

[0033] The formula for correcting rotor winding temperature rise is:

[0034] ;

[0035] In the formula, , These are the measured temperature rises of the stator and rotor windings during the test, in K.

[0036] , These are the stator and rotor winding temperature rises (in K) corrected to the rated inlet temperature (or other temperature) of the cooling medium, respectively.

[0037] , These are the inlet temperature and converted temperature (K) during the cooling medium test, respectively.

[0038] K s K r These are the correction coefficients for the temperature rise of the stator and rotor windings, respectively.

[0039] when > The correction factor is positive; otherwise, it is negative.

[0040] Furthermore, it also includes screening measurement points:

[0041] Historical data of measuring points under the same working conditions were extracted, the mean and deviation were calculated, and abnormal measuring points were screened out using hierarchical clustering algorithm and removed from the test records.

[0042] The measuring points are divided into 12 sub-regions according to their installation positions and angles. Each region contains 15 measuring points. After filtering out abnormal measuring points through consistency detection, n valid measuring points remain, where n≤15.

[0043] In each experiment, the measuring point with the largest temperature rise among the n measuring points is selected as the measuring point for the sub-region.

[0044] A second aspect of the present invention provides an online testing system for the maximum output and temperature rise of a pumped storage unit, comprising:

[0045] The data acquisition module is used to acquire the operating condition data of the pumped storage unit, filter out the maximum output record of the power generation condition, record the corresponding running time, and extract relevant measurement point data.

[0046] The data filtering module is used to filter out the maximum output records with a running time longer than the set time, calculate the active power, reactive power, and stator current deviation of the records within the time. If the deviation is greater than the threshold, it is judged as an invalid experimental record; otherwise, it is a valid experimental record.

[0047] The temperature rise calculation module is used to calculate the temperature rise of each measuring point in the valid experimental record. If the temperature rise of all measuring points is less than or equal to the temperature threshold, it is determined that the experimental record has reached thermal steady state, and the final temperature and temperature rise value of each measuring point are recorded.

[0048] The stability index module is used to calculate the maximum value of the stability index at each measuring point on the experimental record after reaching steady state, and compare it with the standard value. If all indexes are within the allowable range, the unit is considered to be operating stably under the maximum output condition.

[0049] The test report generation module is used to generate test reports that include the final temperature rise and stability of each measuring point under the test conditions.

[0050] A third aspect of the present invention provides a computer-readable storage medium for storing one or more programs, characterized in that: the one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any of the methods described above.

[0051] A fourth aspect of the present invention provides a computing device, comprising:

[0052] One or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs include instructions for performing any of the methods described above.

[0053] The beneficial effects achieved by this invention are as follows:

[0054] This invention transforms the traditional offline test, which originally required shutdown, grid coordination, and a large amount of manpower and resources, into an online evaluation that can be automatically completed during normal unit operation, greatly reducing test costs and avoiding power generation losses caused by the test.

[0055] This invention addresses the challenges of variable operating modes and the scarcity of stable operating conditions in pumped-storage units by designing a multi-dimensional, hierarchical operating condition identification model that integrates "operating status + power + head." This model can accurately and efficiently capture valuable testing opportunities from complex operating data, solving the fundamental problem of poor applicability of traditional methods to pumped-storage units.

[0056] This invention appropriately relaxes the requirements for operating time, making it more consistent with the actual operating conditions of pumped-storage units. Simultaneously, by introducing data processing methods such as stability deviation calculation, dynamic data cleaning, and optimal measurement point selection, the accuracy and reliability of the test results are effectively guaranteed.

[0057] By deploying this method, power plants can periodically and automatically acquire data on the maximum output and temperature rise of their units, forming long-term performance trends. This provides strong data support for understanding the health status of units, assessing equipment aging, predicting potential faults, and optimizing maintenance strategies, thus promoting the development of power plant operation and maintenance towards a more intelligent and refined direction. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the maximum output test data screening process of the present invention;

[0059] Figure 2 This is a schematic diagram of the test process for maximum output and temperature rise of the present invention. Detailed Implementation

[0060] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0061] This invention provides an online test method for the maximum output and temperature rise of a pumped storage unit, comprising the following steps: 1. Identification of test conditions and data acquisition of the pumped storage unit;

[0062] Given the highly variable operating conditions of pumped-storage units, the operating condition identification process must simultaneously consider operating head, operating conditions, and operating load. Specifically:

[0063] like Figure 1 As shown, the system acquires unit operation and status monitoring data based on the power plant data platform. The current unit status is determined based on analog data points, such as "shutdown, power generation, power generation phase adjustment, pumping phase adjustment, pumping, undetermined state," etc. The corresponding time for each status is obtained (assuming a status value of 1 represents the unit's power generation state). For a single power generation record, the start time of the "1" and the time of the "1" value change are recorded, and the time difference between the two is calculated, which is the duration of this power generation operation, t. 发电 .

[0064] To avoid unit state point errors, active power correction is introduced. Considering that the proposed test is a maximum output and temperature rise test, it is assumed that only the generating state is considered, and the actual unit output Pt ≥ Pr (rated output) is considered. During power verification, if Pt < 0, it indicates that the unit is in pumping / pumping phase modulation mode, and the data for this operation is invalid. If Pt ≤ 0.1*Pr, and the unit state is generating phase modulation, then this is a generating phase modulation record, and the data is invalid. If the unit is in generating state, and simultaneously... If Pt > Pr, then it is marked as the maximum output record of a single power generation operation.

[0065] To eliminate the inherent error of the power measurement points, a correction for operating head is introduced. The maximum output record for each power generation condition is extracted, and the operating head H (operating head = upstream water level - downstream water level) is calculated. If H < Hr (Hr is the rated head), the record is considered erroneous and deleted.

[0066] The system acquires the start and end times corresponding to the maximum output record for each power generation condition, and extracts relevant measurement point data from the computer monitoring system, including operating head, active power, reactive power, stator voltage, stator current, collector ring temperature, upper guide bearing temperature, lower guide bearing temperature, water guide bearing temperature, thrust bearing temperature, thrust oil temperature, stator core, stator coil, stator winding, rotor winding, and air cooler cold air. Simultaneously, it extracts data from the condition monitoring system, including upper guide sway, lower guide sway, water guide sway, upper and lower frame vibration, top cover vibration, and tailrace pressure pulsation.

[0067] 2. Temperature rise test procedure;

[0068] According to relevant test procedures, during the maximum output and temperature rise tests of hydropower units, in order to achieve a "thermal steady state," the unit must maintain the same operating conditions for at least 2 hours, while the temperature rise of each component must not exceed 2K. Because pumped-storage units frequently adjust their operating conditions, the duration of a single unit operation rarely exceeds 2 hours. To collect relevant test data, the unit's operating time limit has been reduced to 1.5 hours, and the logic for determining stable operating conditions has been optimized. The specific processing steps are as follows:

[0069] like Figure 2 As shown, (1) obtain the aforementioned records, calculate the runtime of each record, and if the runtime is greater than 1.5h, retain it; otherwise, delete the record.

[0070] (2) Calculate the deviation of active power, reactive power, and stator current in the test record during this period. If the deviation is >5%, the record is considered invalid. The deviation calculation method is as follows (taking active power as an example):

[0071] ;

[0072] In the formula, P tmaxP represents the maximum active power value in this operation record. tave This is the average value.

[0073] Based on the above steps, further screen valid test records, and determine the corresponding operating head and P for each record. tave The combination corresponds to the test conditions recorded.

[0074] Next, the temperature rise at each measuring point will be calculated to determine whether the equipment is in a "thermal steady state." The specific process is as follows:

[0075] (1) Record the temperature at the measuring point corresponding to the end time of the test as T. end Iterate through the historical data of the measurement points to find the temperature T corresponding to the last 60 minutes before the end of the recording. end-60 If no temperature data is available for the corresponding timestamp, linear interpolation is used to obtain the corresponding temperature value, and the temperature difference ΔT at each measuring point is calculated. end .

[0076] (2) The temperature rise formula for some measuring points needs to be corrected. The rotor winding temperature rise is measured by the resistance method, specifically by measuring the voltage U on the rotor slip ring. f Simultaneously, the rotor current I is measured at the shunt. f The average temperature rise ΔT of the rotor winding was calculated as follows. end '.

[0077] ;

[0078] In the formula, R1 is the cold-state DC resistance of the rotor winding in Ω. ;

[0079] R2 is the hot DC resistance of the rotor winding in Ω;

[0080] t1 is the winding temperature / °C when R1 is measured, which is usually equal to the ambient temperature at that time;

[0081] t2 is the average air outlet temperature of the air cooler corresponding to R2, in °C.

[0082] (3) The formula for correcting the temperature rise of the stator winding is:

[0083] ;

[0084] The formula for correcting rotor winding temperature rise is:

[0085] ;

[0086] , These are the measured temperature rises of the stator and rotor windings during the test, in K.

[0087] , These are the stator and rotor winding temperature rises (in K) corrected to the rated inlet temperature (or other temperature) of the cooling medium, respectively.

[0088] , These are the inlet temperature and converted temperature (K) during the cooling medium test, respectively.

[0089] K s K r These are the correction coefficients for the temperature rise of the stator and rotor windings, respectively. When > The correction factor is positive; otherwise, it is negative.

[0090] (4) Considering the large number of temperature measuring points on some components of the unit (e.g., a total of 180 temperature measuring points on the stator coil), if all measuring points are used for calculation, the system load will be too high. Therefore, it is necessary to screen the measuring points, specifically:

[0091] ① Conduct regular consistency analysis of measurement point data (not during the operation of the test system). Specifically, extract historical data of measurement points under the same working conditions, calculate the mean and deviation, use hierarchical clustering algorithm to screen out abnormal measurement points, and remove them from the test records.

[0092] ② Divide the measuring points into 12 sub-regions according to their installation positions and angles. Each region contains 15 measuring points. After filtering out abnormal measuring points through consistency detection, n valid measuring points remain (n≤15).

[0093] ③ In each experiment, the measuring point with the largest temperature rise among the n measuring points is selected as the measuring point for the sub-region.

[0094] 5) If all temperature measuring points ΔT end If the temperature is ≤2℃, the operation record is considered to have reached thermal steady state, and the final temperature and temperature rise of each component are recorded. Otherwise, the equipment is considered to have failed to reach thermal stability during this operation, and the test is not completed.

[0095] 3. Maximum output test procedure

[0096] On the record confirming the effectiveness of the temperature rise test (i.e., reaching thermal steady state), a stability assessment of the maximum output test is conducted simultaneously.

[0097] like Figure 2 As shown, dynamic data cleaning: For high-frequency dynamic data such as vibration, sway, and pressure pulsation, the "3σ criterion" or similar statistical methods are used for preprocessing to remove extreme outliers caused by interference.

[0098] Stability index calculation: Based on the cleaned data, calculate the peak-to-peak value (or maximum value) of each stability measurement point during the test period.

[0099] Standard compliance assessment: The calculated stability indicators (such as upper guide sway, frame vibration, etc.) are compared with the limits specified in national standards or industry specifications such as "Basic Technical Conditions for Hydropower Turbines" (GB / T 15468). If all indicators are within the allowable range, the unit is considered to be operating stably under maximum output conditions. If any indicators exceed the limits, the test record must be marked with abnormal information.

[0100] 4. Generation of test results

[0101] If the test is successful, the system automatically generates a structured test report, including: test conditions (average head, average power, etc.), final temperature rise of each key component (after correction), maximum values ​​of each stability index and their comparison with standard limits, and any stability exceedances are recorded. This report is stored in a historical database for long-term trend analysis of unit performance and health status assessment. If the test is unsuccessful, the reason for the failure is recorded (e.g., failure to reach thermal steady state).

[0102] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

[0103] A computer-readable storage medium storing one or more programs, the programs including instructions that, when executed by a computing device, cause the computing device to perform an online test method for the maximum output and temperature rise of a pumped storage unit.

[0104] A computing device includes one or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs include instructions for performing an online test method for the maximum output and temperature rise of a pumped storage unit.

[0105] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0106] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0107] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0108] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0109] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A method for online testing of maximum output and temperature rise of a pumped storage unit, characterized in that: Obtain operating data of pumped storage units, filter out the maximum output records under power generation conditions, record the corresponding running time, and extract relevant measurement point data; The maximum output records with a running time longer than the set time are selected. The active power, reactive power, and stator current deviation of the records within the set time are calculated. If the deviation is greater than the threshold, the records are judged as invalid experimental records; otherwise, they are valid experimental records. Calculate the temperature rise at each measuring point in the valid experimental record. If the temperature rise at all measuring points is less than or equal to the temperature threshold, it is determined that the experimental record has reached thermal steady state. Record the final temperature and temperature rise value at each measuring point. The maximum values ​​of stability indices at each measuring point are calculated from the experimental records after reaching steady state and compared with the standard values. If all indices are within the allowable range, the unit is considered to be operating stably under maximum output conditions. Generate a test report that includes the final temperature rise and stability at each measuring point under the test conditions.

2. The online test method for maximum output and temperature rise of pumped storage units according to claim 1, characterized in that: Methods for selecting the maximum power output records under power generation conditions include: Only the operating condition of generating power and actual unit output Pt ≥ Pr rated output is considered. During power verification, if Pt < 0, it indicates the unit is in pumping / pumping phase-changing mode, and the data for this operation is invalid. If Pt ≤ 0.1*Pr, and the unit is in generating phase-changing mode, this is a generating phase-changing record, and the data is invalid. If the unit is in generating mode, and simultaneously... If Pt > Pr, then it is marked as the maximum output record of a single power generation operation.

3. The online test method for maximum output and temperature rise of pumped storage units according to claim 2, characterized in that: Methods for selecting the maximum output records under power generation conditions also include: Extract the maximum output record for each power generation condition, calculate the operating head H, where H = upstream water level - downstream water level. If H < Hr, where Hr is the rated head, then this record is considered an error and deleted.

4. The online test method for maximum output and temperature rise of pumped storage units according to claim 1, characterized in that: The deviation calculation method is as follows: ； In the formula, P tmax P represents the maximum active power value in this operation record. tave This is the average value.

5. The online test method for maximum output and temperature rise of pumped storage units according to claim 1, characterized in that: The methods for calculating the temperature rise at each measuring point in the valid experimental records include: The temperature at the measuring point corresponding to the end time of the experiment is recorded as T. end Iterate through the historical data of the measurement points to find the temperature T corresponding to the last 60 minutes before the end of the recording. end-60 If no temperature data is available for the corresponding timestamp, linear interpolation is used to obtain the corresponding temperature value, and the temperature difference ΔT at each measuring point is calculated. end .

6. The online test method for maximum output and temperature rise of pumped storage units according to claim 5, characterized in that: Methods for calculating the temperature rise at each measuring point in valid experimental records also include: Measure the voltage U on the rotor slip ring f Simultaneously, the rotor current I is measured at the shunt. f The average temperature rise ΔT of the rotor winding was calculated. end '; ； In the formula, R1 is the cold-state DC resistance of the rotor winding in Ω. R2 is the hot DC resistance of the rotor winding in Ω; t1 is the winding temperature when R1 is measured in °C; t2 is the average air cooler outlet temperature corresponding to R2 in °C. The formula for correcting the temperature rise of the stator winding is: ； The formula for correcting rotor winding temperature rise is: ； In the formula, , These are the measured temperature rises of the stator and rotor windings during the test, in K. , These are the stator and rotor winding temperature rises (in K) corrected to the rated inlet temperature (or other temperature) of the cooling medium, respectively. , These are the inlet temperature and converted temperature (K) during the cooling medium test, respectively. K s K r These are the correction coefficients for the temperature rise of the stator and rotor windings, respectively. when > The correction factor is positive; otherwise, it is negative.

7. The online test method for maximum output and temperature rise of pumped storage units according to claim 1, characterized in that, This also includes screening measurement points: Historical data of measuring points under the same working conditions were extracted, the mean and deviation were calculated, and abnormal measuring points were screened out using hierarchical clustering algorithm and removed from the test records. The measuring points are divided into 12 sub-regions according to their installation positions and angles. Each region contains 15 measuring points. After filtering out abnormal measuring points through consistency detection, n valid measuring points remain, where n≤15. In each experiment, the measuring point with the largest temperature rise among the n measuring points is selected as the measuring point for the sub-region.

8. An online testing system for the maximum output and temperature rise of a pumped storage unit, characterized in that, include: The data acquisition module is used to acquire the operating condition data of the pumped storage unit, filter out the maximum output record of the power generation condition, record the corresponding running time, and extract relevant measurement point data. The data filtering module is used to filter out the maximum output records with a running time longer than the set time, calculate the active power, reactive power, and stator current deviation of the records within the time. If the deviation is greater than the threshold, it is judged as an invalid experimental record; otherwise, it is a valid experimental record. The temperature rise calculation module is used to calculate the temperature rise of each measuring point in the valid experimental record. If the temperature rise of all measuring points is less than or equal to the temperature threshold, it is determined that the experimental record has reached thermal steady state, and the final temperature and temperature rise value of each measuring point are recorded. The stability index module is used to calculate the maximum value of the stability index at each measuring point on the experimental record after reaching steady state, and compare it with the standard value. If all indexes are within the allowable range, the unit is considered to be operating stably under the maximum output condition. The test report generation module is used to generate test reports that include the final temperature rise and stability of each measuring point under the test conditions.

9. A computer-readable storage medium for storing one or more programs, characterized in that: The one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any of the methods according to claims 1 to 7.

10. A computing device, characterized in that, include: One or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the methods according to claims 1 to 7.

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