CN118032311B

CN118032311B - Power plant running state monitoring system

Info

Publication number: CN118032311B
Application number: CN202410061178.0A
Authority: CN
Inventors: 王可庆; 汪磊; 李鹏; 席万强
Original assignee: Wuxi University
Current assignee: Wuxi University
Priority date: 2024-01-16
Filing date: 2024-01-16
Publication date: 2024-09-20
Anticipated expiration: 2044-01-16
Also published as: CN118032311A

Abstract

The invention relates to the technical field of power plant state monitoring, in particular to a power plant running state monitoring system; the system comprises a data acquisition unit, a state discrimination unit, an analysis discrimination unit, a grading early warning unit and a data calibration unit; according to the invention, the relative vibration signals of the shaft of the monitored equipment are tracked in real time through the data acquisition unit, the real-time vibration frequency diagram is drawn, the vibration law is simply and intuitively displayed, the state discrimination unit and the analysis and judgment unit are used for carrying out statistical analysis on the vibration frequency change trend of the monitored equipment according to the real-time vibration frequency diagram, timely finding out abnormal vibration causes, diagnosing abnormal causes according to the vibration amplitude and direction, accurately monitoring the internal vibration state of the equipment and defects of the supporting structure, carrying out grading output on the diagnosis results through the grading early warning unit, realizing real-time performance of fault finding, carrying out inspection on the diagnosis results through the data calibration unit combined with the actual power generation efficiency, and improving the monitoring accuracy.

Description

Power plant running state monitoring system

Technical Field

The invention relates to the technical field of power plant state monitoring, in particular to a power plant running state monitoring system.

Background

The power plant consists of a turbo generator set, a regenerative system, a boiler, an environment-friendly device, a cooling island, a transformer and other system equipment, and has wide related professional scope and numerous sub-equipment; how to improve the reliability and safety of the power plant unit in the operation process, the method can make accurate judgment in time in the face of the abnormal state of the parameters in the operation process of the unit, and has important significance; the maintenance method of the power plant unit and the equipment is divided into three stages of post maintenance, regular maintenance and state-based maintenance, wherein initially, the post maintenance is the most common mode, with the continuous development of the times, the regular maintenance becomes the main maintenance mode, but the state-based maintenance is developed to the present day to become one of the modes with the highest application frequency, however, in some large-scale power plants, faults influencing the running condition of the unit are various and mostly progressive faults are difficult to find and solve in daily general inspection and spot inspection, and therefore, a need exists for a system capable of realizing timely discovery of potential faults by means of remote state monitoring and fault diagnosis.

Chinese patent application publication No.: CN115933553A discloses a power plant equipment state monitoring system and method, which is technically characterized in that various monitoring data are acquired through a digital control system and transmitted to a data center to be received for diagnosis so as to determine the equipment state of the power plant equipment to be tested; therefore, in the existing power plant state monitoring technology, real-time monitoring of various facilities of a power plant is lacking, fault diagnosis is conducted on the vibration condition of the internal structure and the damage condition of the supporting component, comprehensive monitoring is achieved, real-time monitoring and diagnosis performance is improved, and timeliness and accuracy of fault finding are improved.

Disclosure of Invention

Therefore, the invention provides a power plant running state monitoring system which is used for solving the problem that the accuracy of early warning indication is low due to lack of calibration of running state monitoring results in the prior art.

To achieve the above object, the present invention provides a power plant operating condition monitoring system, comprising,

The data acquisition unit is connected with each vibration acceleration sensor arranged in the tested power plant and used for acquiring shaft relative vibration signals of each turbine generator impeller through the vibration acceleration sensors and drawing a real-time vibration frequency chart according to the shaft relative vibration signals;

the state judging unit is connected with the data acquisition unit and used for judging each monitoring data point in the real-time vibration frequency chart according to the standard displacement fluctuation interval so as to determine whether to correct the real-time vibration frequency chart into a corrected vibration frequency chart;

The analysis judging unit is used for updating the real-time vibration frequency chart into a vibration frequency chart to be analyzed when judging that the monitored data points do not fall into the standard displacement fluctuation interval, calculating the differential vibration frequency according to the vibration frequency chart to be analyzed, and judging the differential vibration frequency according to the first standard vibration frequency and the second standard vibration frequency so as to determine the early warning grade of the steam turbine generator;

the grading early warning unit is respectively connected with the state judging unit and the analysis judging unit and is used for outputting corresponding early warning prompt instructions according to the instructions of the state judging unit and the analysis judging unit;

The data calibration unit is used for correcting and outputting standard running state data according to the real-time power generation efficiency, the early warning prompt level and the real-time efficiency deviation value, wherein the standard running state data comprises a first standard vibration frequency, a second standard vibration frequency and a standard vertical amplitude change rate.

Further, the data acquisition unit comprises,

The tracking monitoring module is used for converting the shaft relative vibration signals into operation state data of each turbine generator impeller, wherein the operation state data comprise real-time horizontal vibration amplitude, real-time horizontal vibration displacement, real-time rotation speed and real-time vertical vibration amplitude;

the spectrogram drawing module is used for drawing a time-dependent change curve of each monitoring data point in a preset tracking monitoring period according to the relative vibration signal of the shaft to generate a real-time vibration frequency chart corresponding to the steam turbine generator, wherein the real-time vibration frequency chart comprises a real-time horizontal vibration amplitude;

The state discrimination unit comprises a state discrimination unit, wherein the state discrimination unit comprises,

The spectrogram judging module is used for judging each monitoring data point in the real-time vibration frequency chart according to the standard displacement fluctuation interval of the steam turbine generator;

And the spectrogram correction module is used for acquiring the real-time rotation speed and the real-time vibration frequency chart of the impeller of the steam turbine generator when the spectrogram judgment module determines that each monitoring data point falls in the standard displacement fluctuation interval, and obtaining a corrected vibration frequency chart by correcting the real-time vibration frequency chart.

Further, the analysis determination unit includes,

The frequency multiplication analysis module is used for calculating real-time frequency multiplication tolerance and real-time vibration frequency according to the corrected vibration frequency chart when the spectrogram discrimination module determines that each monitoring data point falls in the standard displacement fluctuation interval, and comparing the standard frequency multiplication tolerance with the real-time frequency multiplication tolerance to determine whether the real-time rotation speed is matched with the real-time vibration frequency;

The spectrogram updating module is used for drawing a time-dependent change curve of each monitoring data point which does not fall into the standard displacement fluctuation interval when the spectrogram judging module determines that the monitoring data point does not fall into the standard displacement fluctuation interval, and generating a vibration frequency chart to be analyzed corresponding to the steam turbine generator;

The level analysis module is used for calculating a differential vibration frequency according to the vibration frequency diagram to be analyzed when the spectrogram discrimination module determines that the monitored data point does not fall into the standard displacement fluctuation interval, judging the differential vibration frequency according to the first standard vibration frequency and the second standard vibration frequency, judging that the real-time horizontal vibration amplitude is larger than the standard horizontal vibration amplitude when the differential vibration frequency is judged to be between the first standard vibration frequency and the second standard vibration frequency, and judging the real-time vertical vibration amplitude change rate according to the standard vertical vibration amplitude change rate when the real-time vertical vibration amplitude is smaller than the standard vertical vibration amplitude so as to determine the early warning level of the turbogenerator;

And the reason analysis module is used for comparing the real-time horizontal vibration amplitude with the real-time vertical vibration amplitude when the difference vibration frequency is judged to be larger than the second standard vibration frequency so as to analyze the reason of the vibration abnormality.

Further, for any turbo generator, the frequency multiplication analysis module obtains real-time vibration frequency of the turbo generator according to the corrected vibration frequency chart, multiplies the real-time vibration frequency by a fundamental frequency recognition factor to obtain corrected vibration frequency, calculates real-time rotation speed minus absolute value of the corrected vibration frequency to obtain real-time frequency multiplication tolerance, and judges the real-time frequency multiplication tolerance according to standard frequency multiplication tolerance;

When the frequency multiplication analysis module judges that the real-time frequency multiplication tolerance is smaller than the standard frequency multiplication tolerance, the real-time rotation speed is determined to be matched with the real-time vibration frequency, and a primary early warning prompt instruction is generated and sent to the grading early warning unit for indication;

when the real-time frequency multiplication tolerance is larger than or equal to the standard frequency multiplication tolerance, the frequency multiplication analysis module determines that the real-time rotation speed is not matched with the real-time vibration frequency, and the grade analysis module determines the real-time horizontal vibration amplitude according to the first standard horizontal vibration amplitude and the second standard horizontal vibration amplitude so as to determine the running state of the turbogenerator.

Further, for any turbo generator, the level analysis module obtains the number of monitoring data points in the vibration frequency chart to be analyzed and records the number as the number of difference points, calculates the percentage of the number of the difference points to the total sampling points in the tracking monitoring period, obtains the difference vibration frequency, and judges the difference vibration frequency according to the first standard vibration frequency and the second standard vibration frequency;

When the level analysis module judges that the differential vibration frequency is smaller than the first standard vibration frequency, determining that the running state of the steam turbine generator is normal, generating a first-level early warning prompt instruction, and sending the first-level early warning prompt instruction to the level early warning unit for indication;

When the level analysis module judges that the differential vibration frequency is between the first standard vibration frequency and the second standard vibration frequency, the level analysis module judges the real-time horizontal vibration amplitude according to the standard horizontal vibration amplitude so as to determine the running state of the steam turbine generator;

And when the level analysis module judges that the differential vibration frequency is larger than the second standard vibration frequency, the reason analysis module compares the real-time horizontal vibration amplitude with the real-time vertical vibration amplitude so as to analyze the vibration abnormality reason.

Further, when the level analysis module judges that the differential vibration frequency is larger than the second standard vibration frequency, the cause analysis module marks the acquisition point corresponding to the monitoring data point in the vibration frequency diagram to be analyzed as the acquisition point to be analyzed, compares the real-time horizontal vibration amplitude with the real-time vertical vibration amplitude,

When the reason analysis module judges that the real-time horizontal vibration amplitude is larger than the real-time vertical vibration amplitude, determining horizontal vibration abnormality, generating a four-level early warning prompt instruction and sending the horizontal vibration abnormality instruction to the grading early warning unit for indication;

When the reason analysis module judges that the real-time horizontal vibration amplitude is equal to the real-time vertical vibration amplitude, a four-level early warning prompt instruction is generated and sent to the grading early warning unit for indication;

and when the reason analysis module judges that the real-time horizontal vibration amplitude is smaller than the real-time vertical vibration amplitude, determining that the vertical vibration is abnormal, generating a four-level early warning prompt instruction and sending the vertical vibration abnormal instruction to the grading early warning unit for indication.

Further, when the level analysis module judges that the differential vibration frequency is between the first standard vibration frequency and the second standard vibration frequency or the frequency multiplication analysis module judges that the real-time frequency multiplication tolerance is more than or equal to the standard frequency multiplication tolerance, the level analysis module marks the acquisition points corresponding to the monitoring data points in the vibration frequency diagram to be analyzed as the acquisition points to be analyzed, the data acquisition unit acquires the real-time horizontal vibration amplitude corresponding to each acquisition point to be analyzed, judges each real-time horizontal vibration amplitude according to the standard horizontal vibration amplitude,

When the level analysis module judges that the real-time horizontal vibration amplitude is smaller than or equal to the standard horizontal vibration amplitude, the operation state of the steam turbine generator is determined to be normal, and a first-level early warning prompt instruction is generated and sent to the level early warning unit for indication;

When the level analysis module judges that the real-time horizontal vibration amplitude is larger than the standard horizontal vibration amplitude, the real-time vertical vibration amplitude is judged according to the standard vertical vibration amplitude so as to determine whether a four-level early warning prompt instruction is generated and sent to the level early warning unit for indication;

further, when the level analysis module judges that the real-time horizontal vibration amplitude is larger than the standard horizontal vibration amplitude, the level analysis module obtains the corresponding acquisition points to be analyzed as forecast prompt points, the level analysis module obtains the real-time vertical vibration amplitude corresponding to the forecast prompt points through the data acquisition unit, judges the real-time vertical vibration amplitude according to the standard vertical vibration amplitude,

When the level analysis module judges that the real-time vertical vibration amplitude is smaller than the standard vertical vibration amplitude, judging the real-time vertical vibration amplitude change rate according to the standard vertical vibration amplitude change rate so as to determine the early warning level of the steam turbine generator;

and when the level analysis module judges that the real-time vertical vibration amplitude is larger than or equal to the standard vertical vibration amplitude, generating a four-level early warning prompt instruction and sending the four-level early warning prompt instruction to the level early warning unit for indication.

Further, when the level analysis module judges that the real-time vertical vibration amplitude is smaller than the standard vertical vibration amplitude, the data acquisition unit acquires another real-time vertical vibration amplitude passing through a preset acquisition interval by taking the acquisition point to be analyzed as a starting point, calculates the real-time vertical vibration amplitude change rate, judges the real-time vertical vibration amplitude change rate according to the standard vertical vibration amplitude change rate, and selectively generates a secondary early warning prompt instruction or a tertiary early warning prompt instruction to be sent to the level early warning unit for indication;

further, the data calibration unit obtains the real-time power generation amount of the tested power plant and the real-time steam flow of the turbine generator to be calibrated, calculates the ratio of the real-time power generation amount to the real-time steam flow, marks the real-time power generation efficiency, subtracts the real-time power generation efficiency from the standard power generation efficiency to obtain a real-time efficiency deviation value, calculates the ratio of the real-time efficiency deviation value to the real-time power generation efficiency, and marks the real-time power generation deviation rate;

For any turbo generator to be calibrated, the data calibration unit acquires a corresponding standard power generation deviation rate range and a real-time efficiency deviation value to judge based on the early warning prompt grade result of the turbo generator to be calibrated by the grading early warning unit so as to determine whether to correct the standard running state data of the turbo generator to be calibrated.

Compared with the prior art, the invention has the beneficial effects that the data acquisition unit is arranged, the shaft relative vibration signals of the impellers of the steam turbine generators are tracked in real time, the real-time vibration frequency diagram is drawn according to the shaft relative vibration signals, the vibration law is simply and intuitively displayed through the operation state of the monitoring equipment, the state discrimination unit and the analysis and judgment unit are used for carrying out statistic analysis on the vibration frequency change trend of the impellers of the steam turbine generators according to the real-time vibration frequency diagram, the equipment with abnormal vibration is timely found, the abnormal reasons are diagnosed according to the vibration amplitude and the vibration direction, the accurate monitoring of the internal vibration state of the equipment and the defects of the supporting structure is realized, the diagnosis result is output in a grading manner through the grading early warning unit, the real-time performance of fault finding is realized, the diagnosis result is inspected through the data calibration unit combined with the actual power generation efficiency, and the monitoring accuracy is improved.

Further, through setting up standard displacement fluctuation interval to judge the real-time horizontal vibration displacement of monitoring, preliminary judgement equipment's vibration state, if judge that each monitoring data point all falls in standard displacement fluctuation interval, indicate that actual displacement does not surpass the vibration limit value, but because higher vibration frequency also can cause equipment damage, then need judge real-time vibration frequency, if judge that there is monitoring data point and fall into standard displacement fluctuation interval, indicate that the actual displacement surpasses the vibration limit value appears, then trace the frequency that surpasses the vibration limit value in the monitoring period through statistics presets to accurate analysis equipment's inside vibration state improves the timeliness of hidden danger discovery.

Further, when the actual displacement does not exceed the vibration limit value, the real-time frequency multiplication tolerance is judged according to the standard frequency multiplication tolerance, so as to analyze whether the actual rotation speed and the real-time vibration frequency are approximately multiple, and because the vibration caused in the rotation process of the impeller of the equipment to be monitored is changed regularly along with the rotation speed, whether the vibration state of the equipment to be monitored is normal is determined by judging whether the actual rotation speed and the real-time vibration frequency are approximately multiple, if the real-time frequency multiplication tolerance is smaller than the standard frequency multiplication tolerance, the actual rotation speed and the real-time vibration frequency are approximately multiple, namely, the equipment operation state is normal, if the real-time frequency multiplication tolerance is larger than or equal to the standard frequency multiplication tolerance, the actual rotation speed and the real-time vibration frequency are not approximately multiple, namely, the real-time rotation speed and the real-time vibration frequency are not matched, and possibly caused by mechanical problems such as unbalance, looseness of a bearing, bearing bush defects and the like, the operation state of the generator is further analyzed by judging the real-time horizontal vibration amplitude, and the fault diagnosis accuracy is improved.

In particular, by counting the frequency exceeding the vibration limit value in the preset tracking and monitoring period, namely calculating the percentage of the frequency exceeding the vibration limit value to the total vibration frequency, the occurrence of errors of real-time horizontal vibration displacement caused by environmental interference is avoided, if the difference vibration frequency is judged to be smaller than the first standard vibration frequency, the frequency exceeding the vibration limit value in the preset tracking and monitoring period is indicated to be very low, the acquired real-time horizontal vibration displacement caused by the environmental interference is in error and can be ignored, if the difference vibration frequency is judged to be larger than the second standard vibration frequency, the frequency exceeding the vibration limit value in the preset tracking and monitoring period is indicated to be very high, at the moment, the actual displacement exceeds the vibration limit value at high frequency, so that the running state of the equipment is judged to be abnormal, four-level early warning prompt indication is carried out, the real-time horizontal vibration amplitude is compared with the real-time vertical vibration amplitude to analyze the vibration abnormality cause, and if the difference vibration frequency is judged to be between the first standard vibration frequency and the second standard vibration frequency, the running state of the equipment can not be accurately determined simply through the frequency exceeding the vibration limit value, and the running state of the real-time horizontal vibration amplitude is judged, and the running state of the equipment is accurately monitored.

Further, by comparing the real-time horizontal vibration amplitude with the real-time vertical vibration amplitude, the vibration abnormality cause, that is, the magnitude of the horizontal vibration amplitude and the vertical vibration amplitude of the device is compared, the direction of the abnormal vibration of the device is simply analyzed, and the result is output for timely processing.

In particular, the running state of the equipment is accurately tracked by judging each real-time horizontal vibration amplitude according to the standard horizontal vibration amplitude, if the real-time horizontal vibration amplitude is judged to be smaller than or equal to the standard horizontal vibration amplitude, the running state of the turbonator is determined to be normal if the real-time horizontal vibration amplitude is judged to be smaller than or equal to the standard horizontal vibration amplitude, and the running state of the turbonator is accurately determined by judging the real-time vertical vibration amplitude if the real-time horizontal vibration amplitude is judged to be larger than the standard horizontal vibration amplitude.

Further, the operation state of the turbo generator is accurately judged in an omnibearing manner by judging each real-time vertical vibration amplitude according to the standard vertical vibration amplitude, if the real-time vertical vibration amplitude is judged to be larger than or equal to the standard vertical vibration amplitude, the horizontal vibration amplitude and the vertical vibration amplitude are both large, at the moment, the operation state of the turbo generator is dangerous, the possibility of equipment damage caused by the severity of the operation state is large, the turbo generator needs to be stopped in time for checking, if the real-time vertical vibration amplitude is judged to be smaller than the standard vertical vibration amplitude, the horizontal vibration amplitude is large, but the vertical vibration amplitude is low, possibly caused by bearing defects or impeller unbalance, at the moment, the severity of vibration is determined by combining the change trend of the vertical vibration amplitude, and the early warning prompt grade is carried out.

Further, when the vibration amplitude of the device in the horizontal direction is large, but the vibration amplitude of the device in the vertical direction is low, the real-time vertical amplitude change rate is judged, if the real-time vertical amplitude change rate is smaller than the standard vertical amplitude change rate, the vibration amplitude of the device in the horizontal direction is large, but the vertical amplitude is low and stable, the device can run for a long time, if the real-time vertical amplitude change rate is larger than or equal to the standard vertical amplitude change rate, the vibration amplitude of the device in the horizontal direction is large, and the vertical amplitude tends to increase, at the moment, the running state of the device is dangerous, the device can only run continuously in a short time and needs to be overhauled in time, progressive faults which are difficult to be detected in daily general inspection are found in time through analyzing the development trend of the running state of the device, and timeliness of finding potential faults is increased.

Further, the early warning result is judged by combining the actual power generation condition, so that the correctness of the monitoring operation state is ensured.

Drawings

FIG. 1 is a schematic diagram of a power plant operating condition monitoring system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of connection between a data acquisition unit and a spectrogram discrimination unit according to an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating connection between an analysis determination unit and a spectrogram correction module according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of an analysis and determination unit according to an embodiment of the invention.

Detailed Description

In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.

It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.

Referring to fig. 1, which is a schematic diagram of a power plant operation status monitoring system according to an embodiment of the present invention, the present invention provides a power plant operation status monitoring system, including,

The data acquisition unit is connected with each vibration acceleration sensor arranged in the tested power plant and used for acquiring the shaft relative vibration signal of each turbine generator impeller through the vibration acceleration sensor, and comprises,

the spectrogram drawing module is used for drawing a real-time vibration frequency chart according to the shaft relative vibration signals, and the real-time vibration frequency chart comprises real-time horizontal vibration amplitude values;

fig. 2 is a schematic diagram showing connection between a data acquisition unit and a spectrogram discrimination unit according to an embodiment of the present invention;

a state discrimination unit connected with the data acquisition unit and comprising,

The spectrogram judging module is used for judging each monitoring data point in the real-time vibration frequency chart according to the standard displacement fluctuation interval;

the spectrogram correction module is used for correcting the real-time vibration frequency chart into a corrected vibration frequency chart when each monitoring data point is judged to fall in the standard displacement fluctuation interval;

referring to fig. 3 and fig. 4, fig. 3 is a schematic diagram illustrating connection between an analysis determining unit and a spectrogram correction module according to an embodiment of the present invention, and fig. 4 is a schematic diagram illustrating an analysis determining unit according to an embodiment of the present invention;

An analysis determination unit including,

The frequency multiplication analysis module is used for calculating real-time frequency multiplication tolerance and real-time vibration frequency according to the corrected vibration frequency diagram, and comparing the standard frequency multiplication tolerance with the real-time frequency multiplication tolerance to determine whether the real-time rotation speed is matched with the real-time vibration frequency;

the spectrogram updating module is used for updating the real-time vibration frequency chart into a vibration frequency chart to be analyzed when judging that the monitoring data points do not fall into the standard displacement fluctuation interval;

the level analysis module is used for calculating the differential vibration frequency according to the vibration frequency diagram to be analyzed, judging the differential vibration frequency according to the first standard vibration frequency and the second standard vibration frequency, judging the real-time vertical amplitude change rate according to the standard vertical amplitude change rate when the real-time horizontal vibration amplitude is larger than the standard horizontal vibration amplitude and the real-time vertical vibration amplitude is smaller than the standard vertical vibration amplitude when the differential vibration frequency is judged to be between the first standard vibration frequency and the second standard vibration frequency, and determining the early warning level of the turbogenerator;

the reason analysis module is used for comparing the real-time horizontal vibration amplitude with the real-time vertical vibration amplitude when the difference vibration frequency is judged to be larger than the second standard vibration frequency so as to analyze the reason of the vibration abnormality;

The grading early warning unit is connected with the analysis judging unit and is used for determining whether to perform primary early warning prompt indication based on the matching result of the frequency multiplication analysis module, determining early warning prompt indication grade and performing prompt indication based on the judging result of the spectrogram analysis module, and outputting vibration abnormality indication based on the analysis result of the reason analysis module, wherein the vibration abnormality indication comprises horizontal vibration abnormality indication and vertical vibration abnormality indication;

Through setting up data acquisition unit, the axle relative vibration signal of each turbo generator impeller is tracked in real time, and draw real-time vibration frequency diagram according to axle relative vibration signal, through the running state of monitoring facilities, show the law of vibration simply directly perceivedly, with state discrimination unit and analysis decision unit carry out statistical analysis to the vibration frequency variation trend of turbo generator impeller according to real-time vibration frequency diagram, in time discover the unusual equipment of vibration, and diagnose unusual reason according to vibration amplitude and vibration direction, in order to realize the accurate monitoring to the inside vibration state of equipment and bearing structure's defect, carry out the hierarchical output to the diagnosis result through hierarchical early warning unit, in order to realize the real-time of discovery trouble, detect the diagnosis result through data calibration unit jointly actual generating efficiency, improve the accuracy of monitoring.

In this embodiment, the data acquisition unit acquires the operation state data of the power plant to be tested, which includes the motor provided with the vibration acceleration sensor, at preset acquisition intervals, and the state discrimination unit determines the operation state data to analyze the structural vibration condition inside each motor.

Specifically, the spectrogram distinguishing module is internally provided with standard displacement fluctuation intervals corresponding to all the steam turbine generators, the frequency multiplication analysis module is internally provided with real-time rotation speed, the tracking monitoring module acquires real-time horizontal vibration displacement corresponding to all the steam turbine generators of the tested power plant at all the acquisition points and records the real-time horizontal vibration displacement as monitoring data points, the spectrogram drawing module draws a change curve of all the monitoring data points in a preset tracking monitoring period along with time for any steam turbine generator to generate a real-time vibration frequency diagram corresponding to the steam turbine generator, the spectrogram distinguishing module judges all the monitoring data points in the real-time vibration frequency diagram according to the standard displacement fluctuation intervals of the steam turbine generator,

If each monitoring data point falls in the standard displacement fluctuation interval, the spectrogram correction module acquires the real-time rotation speed of the impeller of the turbonator, corrects the real-time vibration frequency chart to obtain a corrected vibration frequency chart, and the frequency multiplication analysis module acquires the real-time vibration frequency of the turbonator in a preset tracking monitoring period according to the corrected vibration frequency chart so as to determine whether the real-time rotation speed is matched with the real-time vibration frequency;

If the monitoring data points do not fall into the standard displacement fluctuation interval, the grade analysis module judges the differential vibration frequency according to the first standard vibration frequency and the second standard vibration frequency so as to determine whether the running state of the steam turbine generator is normal or not;

The real-time vibration frequency map is corrected, wherein the correction comprises the steps of calculating the average value of the absolute values of all real-time horizontal vibration displacements to obtain average vibration displacement, and correcting the absolute values of all real-time horizontal vibration displacements into average vibration displacement;

Acquiring real-time vibration frequency, including acquiring a period according to the corrected vibration frequency diagram, and calculating the reciprocal of the period to obtain the real-time vibration frequency;

the first standard displacement and the second standard displacement form a standard displacement fluctuation interval, the first standard displacement is larger than the second standard displacement, and the absolute values of the first standard displacement and the second standard displacement are equal;

The standard displacement fluctuation interval in the embodiment represents the allowable error of the measurement value of the vibration acceleration sensor, and the set value is related to the measurement precision of the vibration acceleration sensor, the safety requirement of the tested power plant, the running environment and the type of the tested equipment, is generally set in the range of 0.01mm-0.1m and is adaptively selected according to the actual equipment type;

The vibration state of the equipment is primarily judged by setting the standard displacement fluctuation interval to judge the monitored real-time horizontal vibration displacement, if each monitoring data point is judged to fall in the standard displacement fluctuation interval, the actual displacement is not beyond the vibration limit value, but the equipment is damaged due to the higher vibration frequency, the real-time vibration frequency is required to be judged, if the monitoring data point is judged to fall in the standard displacement fluctuation interval, the actual displacement is judged to exceed the vibration limit value, the frequency exceeding the vibration limit value in the tracking monitoring period is preset through statistics, the vibration state inside the equipment is accurately analyzed, and the timeliness of hidden danger discovery is improved.

Specifically, a standard frequency multiplication tolerance and a fundamental frequency recognition factor matrix are arranged in the spectrogram correction module, when each monitoring data point is judged to fall in a standard displacement fluctuation interval, a state judgment unit obtains a real-time rotation speed and a real-time vibration frequency chart of the impeller of the turbonator, the real-time vibration frequency chart is corrected to obtain a corrected vibration frequency chart, the frequency multiplication analysis module obtains the real-time vibration frequency of the turbonator in a preset tracking monitoring period according to the corrected vibration frequency chart, obtains the real-time vibration frequency and multiplies the real-time vibration frequency by the fundamental frequency recognition factor to obtain a corrected vibration frequency, calculates the absolute value of the corrected vibration frequency subtracted by the real-time rotation speed to obtain the real-time frequency multiplication tolerance, and the state judgment unit judges the real-time frequency multiplication tolerance according to the standard frequency multiplication tolerance,

If the real-time frequency multiplication tolerance is smaller than the standard frequency multiplication tolerance, the frequency multiplication analysis module judges that the real-time rotation speed is matched with the real-time vibration frequency, and the grading early-warning unit carries out primary early-warning prompt indication;

if the real-time frequency multiplication tolerance is greater than or equal to the standard frequency multiplication tolerance, the frequency multiplication analysis module judges that the real-time rotation speed is not matched with the real-time vibration frequency, and the grade analysis module judges the real-time horizontal vibration amplitude according to the first standard horizontal vibration amplitude and the second standard horizontal vibration amplitude so as to judge the running state of the steam turbine generator;

Wherein ki=1, 2,3 … … n, ki represents a set base frequency identification factor matrix, n is a positive integer greater than 1;

The standard frequency multiplication tolerance set in the embodiment represents a defined value of whether the actual rotation speed and the real-time vibration frequency are in a multiple relation, namely an error range allowing the actual rotation speed and the real-time vibration frequency to be in a multiple relation, the set value is related to the precision requirement, the equipment type and the running environment, the smaller the standard frequency multiplication tolerance is, the closer the actual rotation speed and the real-time vibration frequency which is n times are, the set value can be set to be 0.05, and the error range is adaptively selected according to the actual rotation speed;

When the actual displacement does not exceed the vibration limit value, the real-time frequency multiplication tolerance is judged according to the standard frequency multiplication tolerance so as to analyze whether the actual rotation speed and the real-time vibration frequency are approximately multiplied, and the vibration is regularly changed along with the rotation speed due to the vibration caused in the rotation process of the impeller of the equipment to be monitored when the equipment to be monitored normally operates, whether the vibration state of the equipment to be monitored is normal or not is determined by judging whether the actual rotation speed and the real-time vibration frequency are approximately multiplied or not, if the real-time frequency multiplication tolerance is smaller than the standard frequency multiplication tolerance, the actual rotation speed and the real-time vibration frequency are approximately multiplied, namely, if the real-time frequency multiplication tolerance is larger than or equal to the standard frequency multiplication tolerance, the actual rotation speed and the real-time vibration frequency are not approximately multiplied, namely, the real-time rotation speed and the real-time vibration frequency are not matched, and the vibration frequency is possibly caused by mechanical problems such as unbalance, bearing looseness, bearing bush defect and the like, the operation state of the turbogenerator is further analyzed by judging the real-time horizontal vibration amplitude, and the fault diagnosis accuracy is improved.

Specifically, a first standard vibration frequency and a second standard vibration frequency are arranged in the analysis judging unit, when judging that the monitoring data points do not fall into a standard displacement fluctuation interval, the spectrogram updating module draws a time-dependent change curve of each monitoring data point which does not fall into the standard displacement fluctuation interval to generate a vibration frequency diagram to be analyzed corresponding to the steam turbine generator, the grade analysis module acquires the number of the monitoring data points in the vibration frequency diagram to be analyzed and records the number of the difference points as the number of the difference points, calculates the percentage of the number of the difference points to the total sampling points in the tracking monitoring period to obtain the difference vibration frequency, the grade analysis module judges the difference vibration frequency according to the first standard vibration frequency and the second standard vibration frequency,

If the differential vibration frequency is smaller than the first standard vibration frequency, the grade analysis module determines that the running state of the steam turbine generator is normal, and controls the grading early-warning unit to perform primary early-warning prompt indication;

if the differential vibration frequency is between the first standard vibration frequency and the second standard vibration frequency, the grade analysis module judges the real-time horizontal vibration amplitude according to the standard horizontal vibration amplitude so as to judge the running state of the turbonator;

And if the differential vibration frequency is larger than the second standard vibration frequency, the reason analysis module compares the real-time horizontal vibration amplitude with the real-time vertical vibration amplitude so as to analyze the reason of the vibration abnormality.

The first standard vibration frequency set in the embodiment approaches zero, and is generally set to be between 0.01 and 0.02, and the second standard vibration frequency represents a vibration frequency limit value, that is, the actual vibration frequency is higher than the second standard vibration frequency, that is, high-frequency vibration, and is generally set to be between 0.5 and 0.7, and is adaptively selected according to the actual safety requirements and the equipment type;

The frequency exceeding the vibration limit value in the preset tracking monitoring period is counted, namely the percentage of the frequency exceeding the vibration limit value in the total vibration frequency is calculated, the occurrence of errors of real-time horizontal vibration displacement caused by environmental interference is avoided, if the difference vibration frequency is judged to be smaller than the first standard vibration frequency, the frequency exceeding the vibration limit value in the preset tracking monitoring period is indicated to be very low, the situation is that the acquired real-time horizontal vibration displacement is caused to have errors due to the environmental interference and can be ignored, if the difference vibration frequency is judged to be larger than the second standard vibration frequency, the frequency exceeding the vibration limit value in the preset tracking monitoring period is indicated to be very high, at the moment, the actual displacement exceeds the vibration limit value at high frequency, therefore, the running state of the equipment is judged to be abnormal, the four-stage early warning prompt indication is carried out, the real-time horizontal vibration amplitude is compared with the real-time vertical vibration amplitude, the vibration abnormality cause is analyzed, if the difference vibration frequency is judged to be between the first standard vibration frequency and the second standard vibration frequency, the running state of the equipment cannot be accurately determined through the frequency exceeding the vibration limit value, and the running state of the equipment is accurately determined, and the running state of the equipment is accurately monitored.

Specifically, when the level analysis module judges that the differential vibration frequency is larger than the second standard vibration frequency, the reason analysis module marks the acquisition point corresponding to the monitoring data point in the vibration frequency diagram to be analyzed as the acquisition point to be analyzed, the analysis judgment unit compares the real-time horizontal vibration amplitude with the real-time vertical vibration amplitude,

If the real-time horizontal vibration amplitude is larger than the real-time vertical vibration amplitude, the reason analysis module judges that the horizontal vibration is abnormal, and controls the grading early-warning unit to carry out four-level early-warning prompt indication and output the horizontal vibration abnormality indication;

If the real-time horizontal vibration amplitude is equal to the real-time vertical vibration amplitude, the reason analysis module controls the grading early warning unit to carry out four-level early warning prompt indication;

and if the real-time horizontal vibration amplitude is smaller than the real-time vertical vibration amplitude, the reason analysis module judges that the vertical vibration is abnormal, and controls the grading early-warning unit to carry out four-stage early-warning prompt indication and output the vertical vibration abnormality indication.

The real-time horizontal vibration amplitude is compared with the real-time vertical vibration amplitude to analyze the vibration abnormality reasons, namely, the horizontal vibration amplitude and the vertical vibration amplitude of the equipment are compared, the abnormal vibration direction of the equipment is simply analyzed, and the result is output so as to be processed in time.

Specifically, the level analysis module is internally provided with standard horizontal vibration amplitude values, when the level analysis module judges that the differential vibration frequency is between the first standard vibration frequency and the second standard vibration frequency, or the frequency doubling analysis module judges that the real-time frequency doubling tolerance is more than or equal to the standard frequency doubling tolerance, the level analysis module marks the acquisition points corresponding to the monitoring data points in the vibration frequency chart to be analyzed as the acquisition points to be analyzed, the data acquisition unit acquires the real-time horizontal vibration amplitude values corresponding to the acquisition points to be analyzed, the real-time horizontal vibration amplitude values are judged according to the standard horizontal vibration amplitude values,

If the real-time horizontal vibration amplitude is smaller than or equal to the standard horizontal vibration amplitude, the grade analysis module judges that the running state of the steam turbine generator is normal, and controls the grading early-warning unit to perform primary early-warning prompt indication;

if the real-time horizontal vibration amplitude is larger than the standard horizontal vibration amplitude, judging the real-time vertical vibration amplitude according to the standard vertical vibration amplitude to determine whether to control the grading early-warning unit to carry out four-level early-warning prompt indication;

The first standard vibration frequency set in the present embodiment represents a definition value of the normal vibration state of the apparatus, which may be set to 2.3 mm per second, and the second standard vibration frequency represents a definition value of the abnormal vibration state of the apparatus, which may be set to 10.1 mm per second;

The running state of the turbine generator is accurately tracked by judging each real-time horizontal vibration amplitude according to the standard horizontal vibration amplitude, if the real-time horizontal vibration amplitude is judged to be smaller than or equal to the standard horizontal vibration amplitude, the running state of the turbine generator is determined to be normal if the real-time horizontal vibration amplitude is judged to be smaller than or equal to the standard horizontal vibration amplitude, and the running state of the turbine generator is accurately determined by judging the real-time vertical vibration amplitude if the real-time horizontal vibration amplitude is judged to be larger than the standard horizontal vibration amplitude.

Specifically, a standard vertical vibration amplitude is arranged in the grade analysis module, when the grade analysis module judges that the real-time horizontal vibration amplitude is larger than the standard horizontal vibration amplitude, the grade analysis module obtains the corresponding acquisition points to be analyzed as forecast prompt points, the grade analysis module obtains the real-time vertical vibration amplitude corresponding to the forecast prompt points through the data acquisition unit, judges the real-time vertical vibration amplitude according to the standard vertical vibration amplitude,

If the real-time vertical vibration amplitude is smaller than the standard vertical vibration amplitude, the grade analysis module judges the real-time vertical vibration amplitude change rate according to the standard vertical vibration amplitude change rate so as to determine the early warning grade of the steam turbine generator;

And if the real-time vertical vibration amplitude is greater than or equal to the standard vertical vibration amplitude, the grade analysis module controls the grading early-warning unit to carry out four-grade early-warning prompt indication.

The standard vertical vibration amplitude set in the embodiment is 2.8 millimeters per second, and the set value can be adaptively adjusted according to the actual safety requirements and the equipment types; the fourth-level early warning prompt indication indicates shutdown checking;

The running state of the turbogenerator is judged accurately in all directions by judging each real-time vertical vibration amplitude according to the standard vertical vibration amplitude, if the real-time vertical vibration amplitude is judged to be larger than or equal to the standard vertical vibration amplitude, the running state of the turbogenerator is dangerous, the possibility of equipment damage caused by the severity of the turbogenerator is high, the turbogenerator needs to be stopped and checked in time, if the real-time vertical vibration amplitude is judged to be smaller than the standard vertical vibration amplitude, the horizontal vibration amplitude is high, but the vertical vibration amplitude is low, possibly caused by bearing defects or impeller unbalance, and at the moment, the severity of vibration is determined by combining the change trend of the vertical vibration amplitude so as to perform early warning prompt level.

Specifically, the level analysis module is internally provided with a standard vertical vibration amplitude change rate, when the level analysis module judges that the real-time vertical vibration amplitude is smaller than the standard vertical vibration amplitude, the data acquisition unit acquires another real-time vertical vibration amplitude passing through a preset acquisition interval by taking the acquisition point to be analyzed as a starting point, calculates the real-time vertical vibration amplitude change rate, judges the real-time vertical vibration amplitude change rate according to the standard vertical vibration amplitude change rate,

If the real-time vertical amplitude change rate is smaller than the standard vertical amplitude change rate, the grade analysis module controls the grading early-warning unit to carry out secondary early-warning prompt indication;

And if the real-time vertical amplitude change rate is greater than or equal to the standard vertical amplitude change rate, the grade analysis module controls the grading early-warning unit to perform three-grade early-warning prompt indication.

The standard vertical amplitude change rate set in this embodiment approaches zero, being set to 0.001 mm per second; presetting a collection interval to be 3 minutes; the second-level early warning prompt indication indicates that the equipment can run for a long time, generally a day, and the third-level early warning prompt indication indicates that the equipment is dangerous and not easy to run continuously for a long time, and needs to be overhauled in time;

when the vibration amplitude of the equipment in the horizontal direction is large, but the vibration amplitude of the equipment in the vertical direction is low, the real-time vertical amplitude change rate is judged, if the real-time vertical amplitude change rate is smaller than the standard vertical amplitude change rate, the vibration amplitude of the equipment in the horizontal direction is large, but the vertical amplitude is low and stable, the equipment can run for a long time, if the real-time vertical amplitude change rate is larger than or equal to the standard vertical amplitude change rate, the vibration amplitude of the equipment in the horizontal direction is large, and the vertical amplitude tends to increase, at the moment, the running state of the equipment is dangerous, the equipment can only run continuously in a short time and needs to be overhauled in time, and progressive faults which are difficult to be detected in daily general inspection are found in time by analyzing the development trend of the running state of the equipment, so that the timeliness of finding potential faults is increased.

Specifically, a standard power generation efficiency and a standard power generation deviation rate range matrix of early warning prompt levels are arranged in the data calibration unit;

The data calibration unit obtains the real-time steam flow of a turbine generator and the real-time generated energy of a corresponding measured power plant, calculates the ratio of the real-time generated energy to the real-time steam flow, marks the real-time power generation efficiency, subtracts the real-time power generation efficiency from the standard power generation efficiency to obtain a real-time efficiency deviation value, calculates the ratio of the real-time efficiency deviation value to the real-time power generation efficiency, and marks the real-time power generation deviation rate;

For any turbine generator, the data calibration unit obtains the corresponding standard power generation deviation rate range and the real-time efficiency deviation value to judge based on the early warning prompt grade result of the grading early warning unit on the turbine generator,

If the real-time efficiency deviation value is within the standard power generation deviation rate range, the data calibration unit does not correct the standard running state data of the steam turbine generator;

if the real-time efficiency deviation value is not within the standard power generation deviation rate range, the data calibration unit compares the real-time efficiency deviation value with the standard power generation deviation rate range to determine whether the turbo generator is a turbo generator to be calibrated,

If the real-time efficiency deviation value is lower than the standard power generation deviation rate range, the data calibration unit does not correct the standard running state data of the steam turbine generator;

And if the real-time efficiency deviation value is higher than the standard power generation deviation rate range, the data calibration unit determines that the steam turbine generator is a steam turbine generator to be calibrated, corrects the standard operation state data of the steam turbine generator to be calibrated, and outputs corrected operation state data.

In particular, when the data calibration unit judges that the real-time efficiency deviation value deltaPs is higher than the standard power generation deviation rate range delta Pbj, the data calibration unit obtains the early warning prompt level of the turbo generator to be calibrated for judgment,

If the first-level warning prompt is given, correcting the first standard vibration frequency Mb1 to Mb1' =Mb1× [1- (delta Ps-Pb1 max)/delta Ps ];

if the two-level early warning prompt is provided, correcting the standard vertical amplitude change rate Vb to be Vb' =vb× [1- (delta Ps-Pb2 max)/delta Ps ];

If the three-level early warning prompt is provided, correcting the standard vertical amplitude change rate Vb to be Vb "=vb× [1+ (Δps-Pb3 max)/Δps ];

if the warning is a four-level warning prompt, correcting the second standard vibration frequency Mb2 to Mb2' =Mb2× [1+ (ΔPs-Pb4 max)/ΔPs ];

Wherein Δ Pbj =Δpb1, Δpb2, … … Δpbk, k=4, pbrmax=pb1max, pb2max, pb3max, pb4max, Δ Pbj represent standard power generation deviation rate range matrices for the early warning cue level, Δpb1 is a standard power generation deviation rate range corresponding to the primary early warning cue indication, Δpb2 is a standard power generation deviation rate range corresponding to the secondary early warning cue indication, … … Δpbk is a standard power generation deviation rate range corresponding to the k-level early warning cue indication, pbrmax represents a maximum value of the standard power generation deviation rate range corresponding to the r-level early warning cue indication;

the standard power generation efficiency set in the embodiment represents the ratio of the theoretical power generation amount of the tested power plant to the real-time steam flow rate, and is 800 kWh/kg; the standard power generation deviation rate range represents the allowable deviation of the power generation efficiency, is related to the type and the operation environment of the steam turbine generator, and is adaptively selected according to the actual power generation amount requirement;

and the early warning result is judged by combining the actual power generation condition, so that the correctness of the monitoring operation state is ensured.

Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.

The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power plant operating condition monitoring system is characterized by comprising,

The analysis and judgment unit comprises a spectrogram judgment module, a spectrogram updating module and a grade analysis module, wherein,

The spectrogram judging module is used for judging that the existing monitoring data points do not fall into a standard displacement fluctuation interval;

The spectrogram updating module is used for drawing a time-dependent change curve of each monitoring data point which does not fall into a standard displacement fluctuation interval and generating a vibration frequency chart to be analyzed corresponding to the steam turbine generator;

The level analysis module acquires the number of the monitoring data points in the vibration frequency chart to be analyzed and records the number as the number of the difference points, and calculates the percentage of the number of the difference points to the total sampling points in the tracking monitoring period to obtain the difference vibration frequency;

2. The plant operating condition monitoring system of claim 1, wherein the data acquisition unit comprises,

3. The plant operating condition monitoring system according to claim 1, wherein the analysis determination unit includes,

4. The power plant operating state monitoring system according to claim 3, wherein for any one of the turbo generators, the frequency multiplication analysis module obtains a real-time vibration frequency of the turbo generator according to a corrected vibration frequency chart, multiplies the real-time vibration frequency by a fundamental frequency identification factor to obtain a corrected vibration frequency, calculates a real-time rotation speed minus an absolute value of the corrected vibration frequency to obtain a real-time frequency multiplication tolerance, and the frequency multiplication analysis module determines the real-time frequency multiplication tolerance according to a standard frequency multiplication tolerance;

5. A plant operating condition monitoring system according to claim 3, wherein for any of the turbo generators, the grade analysis module obtains the differential vibration frequency, and determines the differential vibration frequency based on a first standard vibration frequency and a second standard vibration frequency;

6. The power plant operating condition monitoring system according to claim 5, wherein the cause analysis module marks the acquisition point corresponding to the monitored data point in the vibration frequency chart to be analyzed as the acquisition point to be analyzed when the level analysis module determines that the differential vibration frequency is greater than the second standard vibration frequency, compares the real-time horizontal vibration amplitude with the real-time vertical vibration amplitude,

7. The system according to claim 5, wherein the level analysis module marks the collection points corresponding to the monitored data points in the vibration frequency chart to be analyzed as the collection points to be analyzed when the differential vibration frequency is judged to be between the first standard vibration frequency and the second standard vibration frequency or when the frequency multiplication tolerance is judged to be larger than or equal to the standard frequency multiplication tolerance, acquires the real-time horizontal vibration amplitude corresponding to each collection point to be analyzed through the data collection unit, judges each real-time horizontal vibration amplitude according to the standard horizontal vibration amplitude,

And when the level analysis module judges that the real-time horizontal vibration amplitude is larger than the standard horizontal vibration amplitude, the level analysis module judges the real-time vertical vibration amplitude according to the standard vertical vibration amplitude so as to determine whether to generate a four-level early warning prompt instruction and send the four-level early warning prompt instruction to the level early warning unit for indication.

8. The power plant operating state monitoring system according to claim 7, wherein the level analysis module obtains the corresponding collection points to be analyzed as forecast cue points when determining that the real-time horizontal vibration amplitude is larger than the standard horizontal vibration amplitude, the level analysis module obtains the real-time vertical vibration amplitude corresponding to the forecast cue points through the data collection unit, determines the real-time vertical vibration amplitude according to the standard vertical vibration amplitude,

9. The power plant operating state monitoring system according to claim 8, wherein when the level analysis module determines that the real-time vertical vibration amplitude is smaller than the standard vertical vibration amplitude, the level analysis module takes the to-be-analyzed acquisition point as a starting point, acquires another real-time vertical vibration amplitude at a preset acquisition interval through the data acquisition unit, calculates a real-time vertical vibration amplitude change rate, determines the real-time vertical vibration amplitude change rate according to the standard vertical vibration amplitude change rate, and selectively generates a second-level early warning prompt instruction or a third-level early warning prompt instruction, and sends the second-level early warning prompt instruction or the third-level early warning prompt instruction to the level early warning unit for indication.

10. The power plant running state monitoring system according to claim 9, wherein the data calibration unit obtains a real-time power generation amount of the power plant to be measured and a real-time steam flow of the turbo generator to be calibrated, calculates a ratio of the real-time power generation amount to the real-time steam flow, marks the real-time power generation efficiency, subtracts the real-time power generation efficiency from the standard power generation efficiency to obtain a real-time efficiency deviation value, calculates a ratio of the real-time efficiency deviation value to the real-time power generation efficiency, and marks the real-time power generation deviation rate;