CN112345254B - Method for early warning thrust bearing temperature of pumped storage power station - Google Patents
Method for early warning thrust bearing temperature of pumped storage power station Download PDFInfo
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- CN112345254B CN112345254B CN202011125079.2A CN202011125079A CN112345254B CN 112345254 B CN112345254 B CN 112345254B CN 202011125079 A CN202011125079 A CN 202011125079A CN 112345254 B CN112345254 B CN 112345254B
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- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/008—Measuring or testing arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/06—Bearing arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a method for early warning thrust bearing temperature of a pumped storage power station, and relates to the technical field of pumped storage unit equipment; firstly, reading external IO input data; then processing the input data and filtering abnormal data; judging whether a shutdown order exists according to the input data, if so, returning to the starting step, and if not, performing the subsequent steps; judging whether the signal of the unit rotating speed less than or equal to 0 disappears, if not, returning to the starting step, and if so, executing the subsequent steps; finally, comparing the real-time measured value of the tile temperature with the maximum value of the corresponding moment of the envelope curve graph, if the result is abnormal, the alarm system starts to alarm and records the alarm result into a history library, and if the result is normal, returning to the starting step; the method optimizes the alarm method of the traditional method for thrust bearing temperature based on the fixed threshold out-of-limit, and when the real-time thrust bearing temperature exceeds the operation range, the method can early warn the abnormal operation of the thrust bearing temperature of the pumped storage unit in advance, discover the abnormal operation condition of the thrust bearing temperature in advance and reduce the accident rate.
Description
Technical Field
The invention relates to the technical field of pumped storage unit equipment, in particular to a method for early warning thrust bearing temperature of a pumped storage power station.
Background
The power production equipment of the pumped storage power station is a reversible pump turbine unit, the pumped storage unit is used as important equipment for peak regulation and valley filling which are important to the conformity of a power grid to a center, the safe and stable operation of the pumped storage unit is related to the safety of the power grid, the thrust bearing temperature is an important parameter for directly reflecting whether a thrust bearing operates safely or not, an alarm method with a fixed threshold value out of limit is used in a traditional computer monitoring system, the threshold value set by the alarm method is often higher and is close to a unit bearing temperature protection threshold value, when the threshold value out of limit alarm occurs, the unit is already in an unsafe operation state, the bearing temperature protection is possibly triggered to perform accident shutdown at any time, the processing time of problem left to an operator and a power grid dispatching center is short, and the safe production of the pumped storage unit is not facilitated.
At present, a large number of pumped storage power stations built in China are shut down due to the fact that thrust tile temperature is abnormal, accidents are shut down after tile temperature protection actions, unstable factors are brought to power grid operation, an early warning technology capable of warning the abnormal operation of the pumped storage thrust tile temperature is urgently needed, and at present, no effective method exists in this respect.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for early warning the thrust bearing temperature of a pumped storage power station aiming at the problem that a set is in an unsafe operation state by adopting fixed threshold out-of-limit warning in the prior art.
The invention adopts the following technical scheme for solving the technical problems:
a method for early warning thrust bearing temperature of a pumped storage power station comprises the following steps:
step 1, reading external I/O input data, wherein the reading of the input data comprises the following steps: the state of the unit, the rotating speed of the unit is less than or equal to 0, the temperature of the thrust pad, the temperature of cooling oil of the thrust pad and the shutdown order of the unit;
step 2, carrying out legality processing and filtering processing on the input data, and filtering jittering abnormal data;
step 3, judging whether a unit has a shutdown order currently or not according to the input data, if the unit does not have the shutdown order, executing the subsequent steps, and if the shutdown order exists, returning to the step 1;
step 4, judging whether the signal with the rotating speed of the unit less than or equal to 0 disappears according to the input data, if not, returning to the step 1, and if so, executing the subsequent steps;
step 5, according to input data, searching an envelope curve chart of an oil temperature interval corresponding to the oil temperature S from a thrust tile temperature curve characteristic database by the thrust cooling oil temperature S when the signal disappears when the rotating speed of the unit is less than or equal to 0, comparing a real-time measured value of the thrust tile temperature at the current moment with the maximum value of the moment corresponding to the envelope curve chart, returning to the step 1 if the comparison result is normal, and executing the subsequent steps if the comparison result is abnormal;
and 6, according to input data, according to the thrust cooling oil temperature S when the signal disappears when the rotating speed of the unit is less than or equal to 0, searching an envelope curve chart of an oil temperature interval corresponding to the oil temperature S from a thrust tile temperature curve characteristic database, comparing a real-time measured value of the thrust tile temperature at the current moment with the maximum value of the moment corresponding to the envelope curve chart, returning to the step 1 if the comparison result is normal, and executing subsequent steps if the comparison result is abnormal, performing early warning on the abnormity of the thrust tile temperature and recording the warning time into a historical database.
As a further preferred scheme of the method for warning the thrust bearing temperature of the pumped storage power station, the generation steps of the thrust bearing temperature curve characteristic database are as follows:
step 1, extracting a thrust tile temperature historical curve from startup to shutdown from a computer monitoring system periodically, automatically or manually;
step 2, inquiring all thrust tile temperature rise curves in a time period according to the time period through a historical library inquiry interface of a computer monitoring system, and storing inquiry results into a temporary characteristic library;
step 3, screening data, removing a curve of accident shutdown of the unit, removing a curve of temperature exceeding a threshold value of a monitoring system, removing a curve of bad quality of temperature, and removing a curve of jump of temperature change exceeding 10 ℃ in one second before and after the temperature of the unit;
step 4, classifying all screened curves by taking the temperature S of the cooling oil of the thrust bearing when the signal disappears and the rotating speed of the starting rotating speed of the unit is less than or equal to 0 ℃ from 0 ℃ and taking 3 ℃ as an interval;
step 5, performing data organization on all curves in each interval, calculating the maximum value and the minimum value of the curve at each time T, and forming an envelope curve chart of each thrust pad cooling oil temperature interval with the abscissa as time T and the ordinate as the thrust pad temperature T;
and 6, finally generating a thrust tile temperature curve characteristic database.
As a further preferable scheme of the method for early warning the thrust bearing temperature of the pumped storage power station, the corresponding oil temperature interval in the step 5 takes 3 ℃ as an interval.
As a further preferable scheme of the method for early warning the thrust bearing temperature of the pumped storage power station, the corresponding oil temperature interval in the step 6 takes 6 ℃ as an interval.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the invention is different from the traditional method, adopts an alarm method that the fixed threshold value is out of limit, and because the threshold value is set to be too high, the unit is in an unsafe operation state when the alarm is given;
2. the method comprises the steps of establishing a thrust bearing temperature characteristic database of the pumped storage unit, monitoring and obtaining parameters of thrust bearing temperature and thrust cooling oil temperature of the pumped storage unit, and tracking the change of the bearing temperature in the whole process from the starting-up to the operating mode working condition to the stopping working condition of the pumped storage unit;
3. the invention is convenient for realizing early warning when the temperature of the pumped storage thrust bearing is abnormal, reduces the risk of the operation of the pumped storage power station and improves the warning efficiency.
Drawings
FIG. 1 is a general flow chart of the present invention;
FIG. 2 is a flow chart of the present invention for generating thrust pad temperature curve characteristic data;
FIG. 3 is a temporary feature library of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a method for early warning thrust bearing temperature of a pumped storage power station includes the following steps:
step 1, reading external I/O input data, wherein the reading of the input data comprises the following steps: the state of the unit, the rotating speed of the unit is less than or equal to 0, the temperature of the thrust pad, the temperature of cooling oil of the thrust pad and the shutdown order of the unit;
step 2, carrying out legality processing and filtering processing on the input data, and filtering jittered abnormal data;
step 3, judging whether a unit has a shutdown order currently or not according to the input data, if the unit does not have the shutdown order, executing the subsequent steps, and if the shutdown order exists, returning to the step 1;
step 4, judging whether the signal with the rotating speed of the unit being less than or equal to 0 disappears according to the input data, if not, returning to the step 1, and if so, executing the subsequent steps;
step 5, according to input data, searching an envelope curve chart of an oil temperature interval [ n ℃, n ℃ +3 ℃) corresponding to the oil temperature S (S is more than or equal to N ℃ +3 ℃) from a thrust tile temperature curve characteristic database by the thrust cooling oil temperature S when the signal disappears when the rotating speed of the unit is less than or equal to 0, comparing a real-time measured value of the thrust tile temperature at the current moment with the maximum value of the moment corresponding to the envelope curve chart, if the comparison result is normal, returning to the step 1, and if the comparison result is abnormal, executing the subsequent steps;
and 6, searching an envelope curve chart of an oil temperature interval [ n ℃, n ℃ +6 ℃) corresponding to the oil temperature S (S is more than or equal to S and less than n ℃ +3 ℃) from the thrust tile temperature curve characteristic database according to the input data and the thrust cooling oil temperature S when the signal disappears when the rotating speed of the unit is less than or equal to 0, comparing the real-time measured value of the thrust tile temperature at the current moment with the maximum value of the moment corresponding to the envelope curve chart, returning to the step 1 if the comparison result is normal, and executing subsequent steps if the comparison result is abnormal, performing early warning on the abnormity of the thrust tile temperature and recording the warning time into a history database.
As shown in fig. 2, the generating step of the characteristic database of the thrust pad temperature curve is as follows:
step 1, extracting a thrust tile temperature historical curve from startup to shutdown from a computer monitoring system periodically, automatically or manually;
step 2, inquiring all thrust tile temperature rise curves in a time period according to the time period through a historical library inquiry interface of a computer monitoring system, and storing inquiry results into a temporary characteristic library, as shown in figure 3;
step 3, screening data, removing a curve of accident shutdown of the unit, removing a curve of temperature exceeding a threshold value of a monitoring system, removing a curve of bad quality of temperature, and removing a curve of jump of temperature change exceeding 10 ℃ in one second before and after the temperature of the unit;
step 4, classifying all screened curves by taking the temperature S of the cooling oil of the thrust bearing when the signal disappears and the rotating speed of the starting rotating speed of the unit is less than or equal to 0 ℃ from 0 ℃ and taking 3 ℃ as an interval;
step 5, performing data organization on all curves in each interval, calculating the maximum value and the minimum value of the curve at each time T, and forming an envelope curve chart of each thrust pad cooling oil temperature interval with the abscissa as time T and the ordinate as the thrust pad temperature T;
and 6, finally generating a thrust tile temperature curve characteristic database.
And 3 ℃ is taken as an interval of the corresponding oil temperature interval in the step 5.
And 6 ℃ is taken as an interval of the corresponding oil temperature interval in the step 6.
The historical data based on thrust tile temperature during unit operation generates a curve characteristic database of thrust tile temperature during unit normal operation, and the curve from the start to the stop of the unit is extracted from historical data in a computer monitoring system, wherein each curve comprises three variables which are respectively T, T and S, and the variable T is: starting time with the signal disappearance of the unit 'rotating speed less than or equal to 0' as a starting point; the variable T is: t is a real-time temperature measurement value at the moment of the thrust tile temperature T; and S is the measured value of the cooling oil temperature of the thrust pad when the signal of which the rotating speed is less than or equal to 0 disappears. Classifying the curves as an interval from 0 ℃ to 3 ℃ every time the temperature of the cooling oil of the thrust pad is increased, performing data compilation on all the curves in each interval, calculating the maximum value and the minimum value of the curve at each time T, forming an envelope curve chart of each cooling oil temperature interval of the thrust pad with the abscissa as time T and the ordinate as the temperature T of the thrust pad, and finally generating a characteristic database of the curve of the thrust pad.
When a signal of a starting rotation speed of the unit, namely the rotation speed of the unit is less than or equal to 0, disappears, an envelope curve graph (n is less than or equal to S and less than n +3) of a temperature interval [ n ℃, n ℃ and +3 ℃) corresponding to the thrust pad cooling oil temperature S is found in a thrust pad temperature curve characteristic database, the maximum value of the envelope curve graph at the time t and the real-time measured value of the thrust pad temperature at the time t are compared in real time, and when the real-time measured value of the thrust pad temperature is greater than the maximum value of the envelope curve graph at the time t and greater than the temperature of [ n ℃, n ℃ and 3 ℃, n ℃ and 6 ℃, early warning is carried out.
The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;
secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the invention, only the structures related to the disclosed embodiments are referred to, other structures can refer to common designs, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;
and finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (2)
1. The method for early warning the thrust bearing capacity temperature of the pumped storage power station is characterized by comprising the following steps of:
step 1, reading external I/O input data, wherein the reading of the input data comprises the following steps: the state of the unit, the rotating speed of the unit is less than or equal to 0, the temperature of the thrust pad, the temperature of cooling oil of the thrust pad and the shutdown order of the unit;
step 2, carrying out legality processing and filtering processing on the input data, and filtering jittering abnormal data;
step 3, judging whether a unit has a unit halt order or not at present according to the input data, if not, executing the subsequent step, and if so, returning to the step 1;
step 4, judging whether the signal with the rotating speed of the unit less than or equal to 0 disappears according to the input data, if not, returning to the step 1, and if so, executing the subsequent steps;
step 5, according to input data, cooling the oil temperature S by the thrust pad when the signal disappears when the rotating speed of the unit is less than or equal to 0, searching an envelope curve chart of an oil temperature interval [ n ℃, n ℃ +3 ℃) corresponding to the oil temperature S from a thrust pad temperature curve characteristic database, comparing a real-time measured value of the thrust pad temperature at the current moment with the maximum value of the moment corresponding to the envelope curve chart, returning to the step 1 if the comparison result is normal, and executing the subsequent steps if the comparison result is abnormal;
and 6, according to input data, according to the oil temperature S of the cooling oil of the thrust bearing when the signal disappears when the rotating speed of the unit is less than or equal to 0, searching an envelope curve graph of an oil temperature interval [ n ℃, n ℃ and +6 ℃) corresponding to the oil temperature S from a characteristic database of the thrust bearing temperature curve, comparing a real-time measured value of the thrust bearing temperature at the current moment with the maximum value of the moment corresponding to the envelope curve graph, returning to the step 1 if the comparison result is normal, and executing subsequent steps if the comparison result is abnormal, performing early warning on the abnormity of the thrust bearing temperature and recording the warning time into a historical database.
2. The method for warning thrust bearing temperature of pumped storage power stations according to claim 1, wherein the thrust bearing temperature curve feature database is generated by the following steps:
step 1, extracting a thrust tile temperature historical curve from startup to shutdown from a computer monitoring system periodically, automatically or manually;
step 2, inquiring all thrust tile temperature rise curves in the time period according to the time period through a historical library inquiry interface of the computer monitoring system, and storing inquiry results into a temporary feature library;
step 3, screening data, removing a curve of accident shutdown of the unit, removing a curve of thrust bearing temperature exceeding a threshold value of a computer monitoring system, removing a curve of bad quality of temperature, and removing a curve of jump when the temperature change of one second before and after the thrust bearing temperature exceeds 10 ℃;
step 4, classifying all screened curves by taking the temperature S of the cooling oil of the thrust bearing when the signal disappears and the rotating speed of the starting rotating speed of the unit is less than or equal to 0 ℃ from 0 ℃ and taking 3 ℃ as an interval;
step 5, performing data organization on all curves in each interval, calculating the maximum value and the minimum value of the curve of the thrust bearing temperature T at each time T, and forming an envelope curve chart of which the abscissa of each thrust bearing cooling oil temperature interval is time T and the ordinate is the thrust bearing temperature T;
and 6, finally generating a thrust tile temperature curve characteristic database.
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- 2020-10-20 CN CN202011125079.2A patent/CN112345254B/en active Active
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Effective date of registration: 20220412 Address after: 100032 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Applicant after: STATE GRID CORPORATION OF CHINA Applicant after: STATE GRID NEW ENERGY HOLDING CO.,LTD. Applicant after: JIANGXI HONGPING PUMPED STORAGE Co.,Ltd. Applicant after: NANJING NARI WATER CONSERVANCY AND HYDROPOWER TECHNOLOGY Co.,Ltd. Address before: 100000 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Applicant before: STATE GRID CORPORATION OF CHINA Applicant before: STATE GRID XINYUAN Co.,Ltd. Applicant before: JIANGXI HONGPING PUMPED STORAGE Co.,Ltd. |
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