CN110080921B - Online monitoring and evaluating method and system for main water inlet valve of pumped storage power station - Google Patents
Online monitoring and evaluating method and system for main water inlet valve of pumped storage power station Download PDFInfo
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- CN110080921B CN110080921B CN201910290802.3A CN201910290802A CN110080921B CN 110080921 B CN110080921 B CN 110080921B CN 201910290802 A CN201910290802 A CN 201910290802A CN 110080921 B CN110080921 B CN 110080921B
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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
- F03B11/004—Valve arrangements
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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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- 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
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Abstract
The invention discloses a method and a system for online monitoring and evaluating a main water inlet valve of a pumped storage power station, wherein the method comprises the following steps: analyzing the acquired state information of the main water inlet valve and the state process quantity information of the main water inlet valve to obtain characteristic parameters and an alarm threshold value; monitoring the running state of the main water inlet valve in real time according to the characteristic parameters and the out-of-limit threshold; and scoring the state information and the process quantity information, and evaluating the running state and diagnosing faults of the main water inlet valve and all parts forming the main water inlet valve according to the scoring. According to the method, the scoring standard of the main water inlet valve is established through the expert system and the knowledge base of the main water inlet valve, the operating state of the main water inlet valve and the operating state of each component forming the main water inlet valve are scored, state evaluation and fault diagnosis of the main water inlet valve and the components are realized according to the scoring, a targeted maintenance and overhaul suggestion is provided, and the safety and reliability of the operation of the pumped storage unit and the whole power station are improved.
Description
Technical Field
The invention belongs to the technical field of on-line monitoring and evaluation of a main water inlet valve of a hydroelectric power station, and particularly relates to an on-line monitoring and evaluation method and system of a main water inlet valve of a pumped storage power station.
Background
The pumped storage power station is a hydropower station which pumps water to an upper reservoir at the low ebb of the power load and discharges water to a lower reservoir for power generation at the peak period of the power load, can convert redundant electric energy at the low load of a power grid into high-value electric energy at the peak period of the power grid, is also suitable for frequency modulation and phase modulation, stabilizes the cycle wave and the voltage of a power system, is suitable for emergency standby, and can improve the efficiency of a medium-temperature power station and a nuclear power station of the system. The construction of pumped storage power stations in China starts late, but the quantity and the capacity of the pumped storage power stations are continuously increased due to the high starting point of the after effect, and the technology of the pumped storage power stations in China is in the advanced level in the world at present.
The main water inlet valve of the pumped storage power station is used as important electromechanical equipment of the power station, the upstream is connected with the pressure steel pipe, the downstream is connected with the water inlet volute of the water turbine, and the main water inlet valve is important equipment for ensuring safety under normal production and accident conditions of the pumped storage unit. Compared with the conventional main water inlet valve of the hydroelectric generating set, the main water inlet valve of the pumped storage unit works alternately under various operating conditions, so that the abrasion and vibration of the main water inlet valve part of the pumped storage unit are aggravated and serious consequences are caused more easily, and therefore, the online monitoring of the main water inlet valve of the pumped storage power station has important significance for ensuring the safe and stable operation of the main water inlet valve, is beneficial to timely discovering the fault of the main water inlet valve by workers, carries out maintenance, improves the safety and stability of the whole unit, and reduces economic loss.
However, at present, China only realizes dynamic monitoring and offline analysis aiming at partial characteristic parameters of important working conditions of the main water inlet valve of the pumped storage power station, and does not have the functions of state evaluation and fault diagnosis, maintenance and overhaul suggestions and the like, so that the main water inlet valve can be operated in a potential safety hazard state, even fault causes can not be found in time in the overhaul process, fault sources are found, and the operation safety and reliability of the main water inlet valve are greatly reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an online monitoring and evaluating method and system for a main water inlet valve of a pumped storage power station, and aims to solve the problems that the main water inlet valve of the pumped storage power station can only realize dynamic monitoring and analysis of partial characteristic parameters, can not realize state evaluation and fault diagnosis, and causes low operation safety and reliability of the main water inlet valve.
In order to achieve the above object, the present invention provides, in one aspect, an online monitoring and evaluation method for a main water inlet valve of a pumped storage power station, including:
(1) acquiring the state information of the main water inlet valve under all working conditions, and acquiring the state process quantity information of the main water inlet valve under all working conditions from the unit monitoring system;
(2) analyzing the collected state information and process quantity information to obtain characteristic parameters and an alarm threshold;
(3) monitoring the running state of the main water inlet valve in real time according to the characteristic parameters and the out-of-limit threshold;
(4) scoring the state information and the process quantity information, and evaluating the running state and diagnosing faults of the main water inlet valve and all parts forming the main water inlet valve according to the scoring;
wherein the main water inlet valve state information includes: working sealing pressure, maintenance sealing pressure, valve body vibration, valve body displacement, expansion joint displacement and main water inlet valve environmental noise.
Further, the step (2) specifically includes:
(2.1) amplifying, filtering and isolating the acquired state information of the main water inlet valve; the processed state information and the processed process quantity information form sample data;
(2.2) extracting a mean value and a peak value of the sample data, wherein the mean value and the peak value are used as trend characteristic parameters, and the peak value is used as an alarm threshold value;
(2.3) carrying out Fourier transform on the sample data to obtain a frequency value as a frequency spectrum characteristic parameter; the trend characteristic parameter and the spectrum characteristic parameter constitute the characteristic parameter.
Further, the step (4) specifically includes:
(4.1) analyzing the correlation among various items of state information, if | rho | > 1, taking one item as effective state information, and if 0< | rho | <1, taking both items as effective state information to be evaluated; wherein rho is a correlation coefficient between various pieces of state information;
(4.2) scoring the single effective state information according to a scoring standard;
(4.3) obtaining a comprehensive score of the running state of the main water inlet valve according to the single state information score and the corresponding weight;
wherein, the weight of the single effective information is the sum of the scores of the single effective information under all the working conditions/the score of the effective information under all the working conditions;
(4.4) evaluating the operation states of all parts forming the main water inlet valve according to the single state information scores;
and (4.5) comprehensively evaluating the running state of the main water inlet valve according to the comprehensive score.
Preferably, the scoring criteria in step (4.2) are:
section of will
And
each is divided into 5 intervals, the corresponding scores are 80, 85, 90, 95, 100, 95, 90, 85 and 80 in sequence, and if the sample data is not in the intervals, the score is set as 0;
wherein x isminIs the minimum value, x, of the single-item state information under all the working conditionsmaxThe maximum value of the single state information under all the working conditions.
Preferably, the step (4.4) is specifically:
when the single item of state information is scored to be zero, the component corresponding to the item of state information is in fault;
when the single item of state information score is lower than 90 minutes, the corresponding component running state is not good;
when the single item of state information scores higher than 90 minutes, the corresponding component operates well.
Preferably, the step (4.5) is specifically:
when the comprehensive score is higher than 90 minutes, the overall running state of the main water inlet valve is good;
when the comprehensive score is lower than 90 minutes, the overall running state of the main water inlet valve is not good.
In another aspect, the present invention provides an online monitoring and evaluating system for a main water inlet valve, comprising:
the state acquisition subsystem is used for acquiring the state information of the main water inlet valve under all the working conditions and acquiring the state process quantity information of the main water inlet valve under all the working conditions from the unit monitoring system;
the information integration subsystem is used for analyzing the acquired state information of the main water inlet valve and the state process quantity information of the main water inlet valve to obtain characteristic parameters and an alarm threshold value;
the monitoring subsystem is used for monitoring the running state of the main water inlet valve in real time according to the characteristic parameters and the out-of-limit threshold;
and the state evaluation subsystem is used for grading the state information and the process quantity information and carrying out operation state evaluation and fault diagnosis on the main water inlet valve and all parts forming the main water inlet valve according to the grade.
Wherein the main water inlet valve state information includes: working sealing pressure, maintenance sealing pressure, valve body vibration, valve body displacement, expansion joint displacement and main water inlet valve environmental noise.
Further, the main water inlet valve status process quantity information comprises: the pressure behind the valve, the pressure in front of the valve, the flow rate of the main valve, the sealing on-off state, the opening and closing times of the main water inlet valve, the emergency closing times of the main water inlet valve and the opening and closing time of the main water inlet valve.
Further, the main fill valve information integration subsystem, comprising: the system comprises a signal processing module, a data analysis module, a data storage module and a chart display module;
the signal processing module is used for amplifying, filtering and isolating the acquired state information of the main water inlet valve; the processed state information and the processed process quantity information form sample data;
the data analysis module is used for extracting a mean value and a peak value of the sample data, taking the mean value and the peak value as trend characteristic parameters, and taking the peak value as an alarm threshold value; the system is also used for carrying out Fourier transform on the sample data and taking the obtained frequency value as a frequency spectrum characteristic parameter; the characteristic parameters comprise the trend characteristic parameters and the spectrum characteristic parameters.
The chart display module is used for displaying the sample data oscillogram and a spectrogram obtained by Fourier transform;
and the data storage module is used for storing sample data, characteristic parameters and out-of-limit data.
Further, the state evaluation subsystem includes: the system comprises an effective state information acquisition module, a single item grading module, a comprehensive grading module, a component state evaluation module and a main water inlet valve overall state evaluation module;
the effective state information acquisition module is used for analyzing the correlation among various pieces of state information, if | rho | > is 1, one of the items is taken as effective state information, and if | rho | <1 > is 0, both the items are taken as effective state information to be evaluated; wherein rho is a correlation coefficient between various pieces of state information;
the single item scoring module is used for scoring the single item effective state information according to a scoring standard;
the comprehensive scoring module is used for obtaining comprehensive scoring of the running state of the main water inlet valve according to the scoring of the single state information and the corresponding weight;
the component state evaluation module is used for evaluating the running states of all components forming the main water inlet valve according to the single state information scores;
and the overall evaluation module of the main water inlet valve is used for comprehensively evaluating the overall running state of the main water inlet valve according to the comprehensive score.
Further, the scoring criteria are:
section of will
And
each is divided into 5 intervals, the corresponding scores are 80, 85, 90, 95, 100, 95, 90, 85 and 80 in sequence, and if the sample data is not in the intervals, the score is set as 0;
wherein x isminIs the minimum value, x, of the single-item state information under all the working conditionsmaxThe maximum value of the single-item state information under all the working conditions.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
(1) the invention collects the state information of the main water inlet valve through the sensor, realizes the dynamic monitoring and analysis of a plurality of parameters under all working conditions of the main water inlet valve, and effectively improves the safety and the reliability of the operation of the pumped storage unit and the whole power station.
(2) According to the invention, the operation state of the main water inlet valve and the operation states of all parts forming the main water inlet valve are graded according to the professional system and the knowledge base of the main water inlet valve, and the state evaluation and fault diagnosis are carried out on the main water inlet valve and the parts according to the grading, so that a targeted maintenance and overhaul suggestion is provided, and a good foundation is laid for the safe and reliable operation of the main water inlet valve and the promotion of the construction of an intelligent power plant.
Drawings
Fig. 1 is a schematic flow chart of an online monitoring and evaluation method for a main water inlet valve of a pumped storage power station according to an embodiment of the present invention;
FIG. 2 is a flow chart of scoring criteria setting;
FIG. 3 is a schematic view of a process for evaluating the condition of the main fill valve and the various components that make up the main fill valve;
fig. 4 is a schematic structural view of an online monitoring and evaluating system for a main water inlet valve of a pumped storage power station according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a main water inlet valve on-line monitoring and evaluating device of the pumped storage power station;
the system comprises a valve body vibration sensor, a valve front working maintenance sealing pressure sensor, a main water inlet valve, a noise sensor, a telescopic joint, an on-line monitoring and evaluation system industrial control cabinet, a signal wiring groove, a valve rear working maintenance sealing pressure sensor, a concrete buttress, a telescopic joint displacement sensor, a valve body vibration sensor, a valve front working maintenance sealing pressure sensor, a main water inlet valve and a noise sensor, wherein the telescopic joint 1, the industrial control cabinet 2, the signal wiring groove 3, the valve rear working maintenance sealing.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a first embodiment of the present invention provides an online monitoring and evaluation method for a main water inlet valve of a pumped storage power station, including:
(1) acquiring the state information of the main water inlet valve under all working conditions, and acquiring the state process quantity information of the main water inlet valve under all working conditions from the unit monitoring system;
specifically, state information including working sealing pressure, overhauling sealing pressure, valve body vibration, valve body displacement, expansion joint displacement, noise and the like under all working conditions of a main water inlet valve of the pumped storage power station is collected through a sensor; meanwhile, state process quantity information including valve back pressure, main valve flow, valve front pressure, sealing on-off state, main water inlet valve opening and closing times, main water inlet valve emergency closing times, main water inlet valve opening and closing time and the like under all working conditions is obtained from the unit monitoring system; all working conditions of the main water inlet valve comprise: the method comprises the following steps of water pump starting, a water pump, water pump braking, water pump power-off, water pump load shedding, water reversing pump, water turbine starting, a water turbine, water turbine braking and water turbine load shedding, and the phase adjustment is equal.
(2) Analyzing the collected state information and process quantity information to obtain characteristic parameters and an alarm threshold;
specifically, the step (2) specifically includes:
(2.1) amplifying, filtering and isolating the acquired state information of the main water inlet valve; the processed state information and the processed process quantity information form sample data;
(2.2) drawing a sample data waveform graph, and extracting a mean value and a peak value, wherein the mean value and the peak value are used as trend characteristic parameters for trend prediction of the next time period, and the peak value is used as an alarm threshold value;
(2.3) carrying out Fourier transform on the sample data, and using the obtained frequency value as a frequency spectrum characteristic parameter for frequency spectrum analysis; the trend characteristic parameter and the spectrum characteristic parameter constitute the characteristic parameter.
(3) Monitoring the running state of the main water inlet valve in real time according to the characteristic parameters and the out-of-limit threshold;
specifically, when the state information exceeds the alarm threshold, out-of-limit alarm information is sent.
(4) Scoring the state information and the process quantity information, and evaluating the running state and diagnosing faults of the main water inlet valve and all parts forming the main water inlet valve according to the scoring;
specifically, the step (4) specifically includes:
(4.1) analyzing the correlation among various items of state information, if | rho | > 1, taking one item as effective state information, and if 0< | rho | <1, taking both items as effective state information to be evaluated; wherein rho is a correlation coefficient between various pieces of state information;
(4.2) As shown in FIG. 2, the interval is divided according to the technical guide rule, the regulation, the knowledge base of the main water inlet valve and the expert experience
And
each is divided into 5 intervals, the corresponding scores are 80, 85, 90, 95, 100, 95, 90, 85 and 80 in sequence, and if the sample data is not in the intervals, the score is set as 0; taking the obtained information as a scoring standard to score the single effective state information;
wherein x isminIs the minimum value, x, of the single-item state information under all the working conditionsmaxThe maximum value of the single-item state information under all the working conditions.
(4.3) obtaining a comprehensive score of the running state of the main water inlet valve according to the single state information score and the corresponding weight; wherein, the weight of the single effective information is the sum of the scores of the single effective information under all the working conditions/the score of the effective information under all the working conditions;
(4.4) evaluating the operation states of all parts forming the main water inlet valve according to the single state information scores; when the single item of state information is scored to be zero, the component corresponding to the item of state information is considered to be in fault; when the single item of state information score is lower than 90 minutes, the corresponding component is considered to be in poor operation state; and when the single item of state information is scored to be higher than 90 minutes, the corresponding component is considered to be in good operation state.
(4.5) evaluating the running state of the main water inlet valve according to the comprehensive score, and considering that the whole main water inlet valve is in a good state when the comprehensive score is higher than 90 minutes; when the comprehensive score is lower than 90 minutes, the main water inlet valve is considered to be poor in whole or have component faults.
The embodiment of the invention provides an online monitoring and evaluating system for a main water inlet valve of a pumped storage power station, which comprises:
the state acquisition subsystem is used for acquiring the state information of the main water inlet valve under all the working conditions and acquiring the state process quantity information of the main water inlet valve under all the working conditions from the unit monitoring system;
the information integration subsystem is used for analyzing the acquired state information of the main water inlet valve and the state process quantity information of the main water inlet valve to obtain characteristic parameters and an alarm threshold value;
the monitoring subsystem is used for monitoring the running state of the main water inlet valve in real time according to the characteristic parameters and the out-of-limit threshold;
and the state evaluation subsystem is used for grading the state information and the process quantity information and carrying out operation state evaluation and fault diagnosis on the main water inlet valve and all parts forming the main water inlet valve according to the grade.
Wherein the main water inlet valve state information includes: working sealing pressure, maintenance sealing pressure, valve body vibration, valve body displacement, expansion joint displacement and main water inlet valve environmental noise.
The main water inlet valve state process quantity information comprises: the pressure behind the valve, the pressure in front of the valve, the flow rate of the main valve, the sealing on-off state, the opening and closing times of the main water inlet valve, the emergency closing times of the main water inlet valve and the opening and closing time of the main water inlet valve.
The information integration subsystem comprises: the device comprises a signal processing module, a data analysis module, a data storage module and a chart display module;
the signal processing module is used for amplifying, filtering and isolating the acquired state information of the main water inlet valve; the processed state information and the processed process quantity information form sample data;
the data analysis module is used for extracting a mean value and a peak value of the sample data, taking the mean value and the peak value as trend characteristic parameters, and taking the peak value as an alarm threshold value; the system is also used for carrying out Fourier transform on the sample data and taking the obtained frequency value as a frequency spectrum characteristic parameter; the characteristic parameters comprise the trend characteristic parameters and the spectrum characteristic parameters;
the chart display module is used for displaying the sample data oscillogram and a spectrogram obtained by Fourier transform;
and the data storage module is used for storing sample data, characteristic parameters and out-of-limit data.
The state evaluation subsystem includes: the system comprises an effective state information acquisition module, a single item grading module, a comprehensive grading module, a component state evaluation module and a main water inlet valve overall state evaluation module;
the effective state information acquisition module is used for analyzing the correlation among various pieces of state information, if | rho | > is 1, one of the items is taken as effective state information, and if | rho | <1 > is 0, both the items are taken as effective state information to be evaluated; wherein rho is a correlation coefficient between various pieces of state information;
the single item scoring module is used for scoring the single item effective state information according to a scoring standard;
the comprehensive scoring module is used for obtaining comprehensive scoring of the running state of the main water inlet valve according to the scoring of the single state information and the corresponding weight;
the component state evaluation module is used for evaluating the running states of all components forming the main water inlet valve according to the single state information scores;
and the integral evaluation module of the main water inlet valve is used for evaluating the integral running state of the main water inlet valve according to the comprehensive score.
In the embodiment of the present invention, the detailed implementation manner of each subsystem and module may refer to the description in the corresponding method embodiment, and the embodiment of the present invention will not be repeated.
The third embodiment of the invention provides an online monitoring and evaluating device for a main water inlet valve of a pumped storage power station, a physical diagram of which is shown in fig. 5, and the online monitoring and evaluating device comprises: the system comprises a telescopic joint 1, an industrial control cabinet 2 of an online monitoring and evaluating system, a signal wiring groove 3, a valve rear working overhaul sealing pressure sensor 4, a concrete buttress 5, a telescopic joint displacement sensor 6, a valve body displacement sensor 7, a valve body vibration sensor 8, a valve front working overhaul sealing pressure sensor 9, a main water inlet valve 10 and a noise sensor 11;
the online monitoring and evaluation system industrial control cabinet 2 is the online monitoring and evaluation system provided in the second embodiment;
the signal wiring groove 3 is used for wiring the signal cables of the sensors;
the post-valve working maintenance sealing pressure sensor 4 is a contact sensor of L OG402 type, is used for monitoring post-valve working sealing pressure and maintenance sealing pressure, and is connected with a mechanical pressure gauge by a three-way joint.
The telescopic joint displacement sensor 6 is an M L33 series non-contact sensor and is used for monitoring the displacement of the telescopic joint, angle steel is selected as a manufacturing material of a bracket, a structure of the telescopic joint sensor bracket is designed, and the distance between a sensor mounting hole and a measured plane is required to be 78 mm;
the valve body displacement sensor 7 is a non-contact sensor of M L33 series and is used for monitoring the displacement of a valve body, angle steel is selected as a manufacturing material of a support, a telescopic joint sensor support structure is designed, a sensor mounting hole is required to be 78mm away from a measured plane, 2 measuring sensors are respectively used for measuring the displacement in the X, Y direction, the direction of a ball valve base in the X direction (along the water flow direction) is perpendicular to the direction of the water flow pointing to the valve body, and is in the Y direction, and particularly, the diagonal lines of the ball valve base are provided with the same symmetrical measuring points of the displacement of the valve body.
The valve body vibration sensor 8 is a PCB-622B01 single-shaft type contact sensor for monitoring the vibration of the valve body, wherein 3 measuring sensors point to the valve body and respectively measure the vibration in the X, Y, Z direction: the ball valve base is arranged in the X direction (along the water flow direction), the Y direction (vertical to the water flow direction) and the Z direction (vertical to the buttress direction); in particular, the diagonals of the valve body have the same valve body vibration symmetrical measuring point arrangement.
The pre-valve working maintenance sealing pressure sensor 9 is a contact type sensor of L OG402, is used for monitoring the pre-valve working sealing pressure and the maintenance sealing pressure, and is connected with a mechanical pressure gauge by a three-way joint.
The noise sensor 11 is a PCB-130a24 type non-contact noise sensor for monitoring ambient noise.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. An on-line monitoring and evaluating method for a main water inlet valve of a pumped storage power station is characterized by comprising the following steps:
(1) analyzing the acquired state information of the main water inlet valve and the state process quantity information of the main water inlet valve to obtain characteristic parameters and an alarm threshold value;
(2) monitoring the running state of the main water inlet valve in real time according to the characteristic parameters and the alarm threshold value;
(3) scoring the state information and the process quantity information, and evaluating the running state and diagnosing faults of the main water inlet valve and all parts forming the main water inlet valve according to the scoring; the step (3) specifically comprises:
(3.1) analyzing the correlation among various items of state information, taking one item as effective state information if | rho | ═ 1, and taking both items as effective state information to be evaluated if 0< | rho | < 1; wherein rho is a correlation coefficient between various pieces of state information;
(3.2) scoring the single effective state information according to a scoring standard;
(3.3) obtaining a comprehensive score of the running state of the main water inlet valve according to the single effective state information score and the corresponding weight; wherein, the single effective state information weight is the sum of the scores of the single effective state information under all the working conditions and the scores of the effective state information under all the working conditions;
(3.4) evaluating the running states of all parts forming the main water inlet valve according to the single effective state information scores;
(3.5) comprehensively evaluating the running state of the main water inlet valve according to the comprehensive score;
wherein the main water inlet valve state information includes: working sealing pressure, maintenance sealing pressure, valve body vibration, valve body displacement, expansion joint displacement and main water inlet valve environmental noise.
2. The on-line monitoring and evaluating method for the main water inlet valve of the pumped-storage power station as claimed in claim 1, wherein the step (1) specifically comprises:
(1.1) amplifying, filtering and isolating the acquired state information of the main water inlet valve; the processed state information and the processed process quantity information form sample data;
(1.2) extracting a mean value and a peak value of the sample data, wherein the mean value and the peak value are used as trend characteristic parameters, and the peak value is used as an alarm threshold value;
(1.3) carrying out Fourier transform on the sample data to obtain a frequency value as a frequency spectrum characteristic parameter; the trend characteristic parameter and the spectrum characteristic parameter constitute the characteristic parameter.
3. The pumped-storage power station main water inlet valve on-line monitoring and evaluation method as claimed in claim 1, wherein the scoring criterion in the step (3.2) is:
section of will
And
each is divided into 5 intervals, the corresponding scores are 80, 85, 90, 95, 100, 95, 90, 85 and 80 in sequence, and if the sample data is not in the intervals, the score is set as 0;
wherein x isminIs the minimum value, x, of single effective state information under all working conditionsmaxThe maximum value of the single effective state information under all the working conditions.
4. The on-line monitoring and evaluation method for the main water inlet valve of the pumped storage power station as claimed in claim 1, wherein the step (3.4) is specifically as follows:
when the single item of effective state information is scored to be zero, the component corresponding to the item of state information is in fault;
when the single effective state information score is lower than 90 minutes, the corresponding component running state is not good;
when the single item of effective state information is scored to be higher than 90 minutes, the corresponding component is in good operation state.
5. The on-line monitoring and evaluation method for the main water inlet valve of the pumped storage power station as claimed in claim 1, wherein the step (3.5) is specifically as follows:
when the comprehensive score is higher than 90 minutes, the overall running state of the main water inlet valve is good;
when the comprehensive score is lower than 90 minutes, the overall running state of the main water inlet valve is not good.
6. The utility model provides a pumped storage power station main water intaking valve on-line monitoring evaluation system which characterized in that includes:
the information integration subsystem is used for analyzing the acquired state information of the main water inlet valve and the state process quantity information of the main water inlet valve to obtain characteristic parameters and an alarm threshold value;
the monitoring subsystem is used for monitoring the running state of the main water inlet valve in real time according to the characteristic parameters and the alarm threshold value;
the state evaluation subsystem is used for scoring the state information and the process quantity information, and carrying out operation state evaluation and fault diagnosis on the main water inlet valve and all parts forming the main water inlet valve according to the score; the state evaluation subsystem includes: the system comprises an effective state information acquisition module, a single item grading module, a comprehensive grading module, a component state evaluation module and a main water inlet valve overall state evaluation module;
the effective state information acquisition module is used for analyzing the correlation among various pieces of state information, taking one item as effective state information if | rho | is 1, and taking the two items as effective state information to be evaluated if 0< | rho | < 1; wherein rho is a correlation coefficient between various pieces of state information;
the single item scoring module is used for scoring the single item effective state information according to a scoring standard;
the comprehensive scoring module is used for obtaining comprehensive scoring of the running state of the main water inlet valve according to the scoring of the single effective state information and the corresponding weight;
the component state evaluation module is used for evaluating the running states of all components forming the main water inlet valve according to the single effective state information score;
the integral evaluation unit of the main water inlet valve is used for evaluating the integral running state of the main water inlet valve according to the comprehensive score;
wherein the main water inlet valve state information includes: working sealing pressure, maintenance sealing pressure, valve body vibration, valve body displacement, expansion joint displacement and main water inlet valve environmental noise.
7. The on-line monitoring and evaluating system for the main water inlet valve of the pumped-storage power station as claimed in claim 6, wherein the information integration subsystem comprises: the device comprises a signal processing module and a data analysis module;
the signal processing module is used for amplifying, filtering and isolating the acquired state information; the processed state information and the processed process quantity information form sample data;
the data analysis module is used for extracting a mean value and a peak value of the sample data, taking the mean value and the peak value as trend characteristic parameters, and taking the peak value as an alarm threshold value; the system is also used for carrying out Fourier transform on the sample data and taking the obtained frequency value as a frequency spectrum characteristic parameter; the trend characteristic parameter and the spectrum characteristic parameter constitute the characteristic parameter.
8. The on-line monitoring and evaluating system for the main water inlet valve of the pumped-storage power station as claimed in claim 6, wherein the scoring criteria are:
section of will
And
each divided into 5 sections, and evaluated correspondinglyThe scores are sequentially 80, 85, 90, 95, 100, 95, 90, 85 and 80, and if the sample data is not in the interval, the score is set as 0;
wherein x isminIs the minimum value, x, of single effective state information under all working conditionsmaxThe maximum value of the single effective state information under all the working conditions.
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| CN110738400A (en) * | 2019-09-20 | 2020-01-31 | 江苏欣皓测试技术有限公司 | System health assessment method and device, electronic equipment and storage medium |
| CN111122150A (en) * | 2020-01-08 | 2020-05-08 | 中国电建集团华东勘测设计研究院有限公司 | Water inlet ball valve hydraulic self-excited vibration monitoring processing device and method for pumped storage power station |
| CN113027658B (en) * | 2021-03-24 | 2022-08-02 | 华中科技大学 | Real-time state evaluation method for water turbine runner and application thereof |
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