CN112858906A - Method for eliminating influence of motor rotation speed disturbance on fatigue accumulation - Google Patents
Method for eliminating influence of motor rotation speed disturbance on fatigue accumulation Download PDFInfo
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Abstract
The application discloses a method for eliminating the influence of motor rotating speed disturbance on fatigue accumulation, which comprises the following steps: s1, collecting signals, and collecting the rotating speed information of the generator; s2, filtering, wherein after the rotation speed signals are collected, the rotation speed signals are filtered by a low-pass filter, and the rotation speed signals near or below the fundamental frequency are left; s3, on the basis of normal processing of the rotating speed signal, the voltage and the current of the generator are taken into consideration as the running condition of the generator; and S4, in the running process of the generator, if the rotating speed signal is far beyond the normal running range, the monitoring device gives an alarm of abnormal rotating speed, and torsional vibration fatigue accumulation is not performed any more. The invention eliminates the errors caused by high-frequency signals and signal circuit interference by processing the speed signals; the fatigue accumulation error superposition caused by various operations or interferences is reduced, the accuracy of a system fatigue calculation value is enhanced, and the shutdown and inspection cost of the motor caused by false alarm is reduced.
Description
Technical Field
The application relates to the technical field of electrical engineering and automation thereof, in particular to a method for eliminating the influence of motor rotating speed disturbance on fatigue accumulation.
Background
The subsynchronous electromechanical resonance is possibly induced by the series capacitance compensation of the power transmission line, direct current transmission, feedback effects of an improperly installed power system stabilizer, a generator excitation system, a silicon controlled control system and an electro-hydraulic regulation system and the like. Because the inertia of the rotors of the steam turbine and the generator is large, the rotors of the steam turbine and the generator are very sensitive to the low-order torsional mode of the shafting and are in a low-cycle high-stress state, and the electromechanical resonance directly threatens the safe and reliable operation of the unit, so that the torsional vibration monitoring equipment is generated at the right moment.
At present, the equipment capable of continuously monitoring torsional vibration in real time mainly measures the rotating speed of a steam turbine by a tooth measuring method and calculates the low-frequency oscillation state of the steam turbine through the change of the rotating speed. And calculating the stress of the section according to the voltage and the current of the steam turbine, and establishing a shafting model according to the physical structure of the shafting to calculate the fatigue loss degree of various torsional vibration states to the motor shafting. Fatigue loss caused by each disturbance is accumulated, and when the accumulated value reaches a dangerous state, the monitoring equipment can send out an alarm or shutdown protection prompt to the steam turbine.
However, in the torsional vibration monitoring device applied to engineering, after the fatigue value is calculated by using the rotating speed signal, the fatigue accumulation is directly carried out, but the signal interference of high frequency is ignored, and after the rotating speed exceeds the range of the fundamental frequency, the torsional vibration value calculated by the abnormal rotating speed signal is not suitable for the current generator shafting model established based on the fundamental frequency. The fatigue value is accumulated incorrectly, the time for stopping the operation of the generator is shortened, the benefit is reduced, and the cost is increased, so that a method for eliminating the influence of the rotating speed disturbance of the motor on the fatigue accumulation is provided.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a method for eliminating the influence of the motor rotating speed disturbance on fatigue accumulation; the running state of the generator is taken as the necessary condition for the accumulative calculation of the torsional vibration, the interference caused by any condition under the condition that the generator is stopped is completely eliminated, and the superposition of large-amplitude fatigue values caused by the step change of the rotating speed when the motor is started is also avoided; by means of limitation of the rotating speed range, the influence of faults and artificial operation abnormity of a rotating speed signal propagation path is eliminated, and a reminding effect is achieved for a user; the fatigue accumulation error superposition caused by various operations or interferences is reduced, the accuracy of a system fatigue calculation value is enhanced, and the shutdown and inspection cost of the motor caused by false alarm is reduced.
The embodiment of the application adopts the following technical scheme:
a method for eliminating the influence of motor speed disturbance on fatigue accumulation comprises the following steps:
s1, collecting signals, and collecting the rotating speed information of the generator;
s2, filtering, wherein after the rotation speed signals are collected, the rotation speed signals are filtered by a low-pass filter, and the rotation speed signals near or below the fundamental frequency are left;
s3, on the basis of normal processing of the rotating speed signal, the voltage and the current of the generator are taken into consideration as the running condition of the generator;
and S4, in the running process of the generator, if the rotating speed signal is far beyond the normal running range, the monitoring device gives an alarm of abnormal rotating speed, and torsional vibration fatigue accumulation is not performed any more.
Preferably, the filtering process in step S2 mainly uses a torsional vibration monitoring device for sub-synchronous oscillation, and the high-frequency harmonic is not suitable for the shafting torsional vibration model established for low-frequency oscillation, so as to remove the influence of the high-frequency signal and prevent the high-frequency interference existing from the sampling of the rotation speed signal to the use.
Preferably, in step S3, when the generator is not running, if a virtual signal and interference enter the signal processing system, the torsional vibration fatigue still accumulates, and because the turbine is not running, there is no real fatigue accumulation, and the generator sends out a voltage and a current equivalent to a rated state and continues for a period of time, and the voltage and the current are used as a sign of normal running of the generator and are incorporated into the signal processing logic, so as to prevent any influence caused by maintenance, testing or interference in a shutdown state.
Preferably, when a problem occurs in the transmission path of the rotation speed signal in step S4, and the rotation speed signal at this time is meaningless, the abnormality of the rotation speed is reported.
Preferably, the unidirectional increase or decrease of the rotating speed of the generator in step S4 exceeds the normal operating range, the low-frequency oscillation state caused by disturbance is not the case, but the speed regulation behavior of the generator is performed by itself, and since the rotating speed deviates from the fundamental frequency range, the shafting torsional vibration model is not applicable, and the monitoring device should report the abnormal rotating speed and does not perform the fatigue accumulation calculation.
Preferably, when the rotation speed of the generator increases or decreases in one direction in step S4, if the change in the rotation speed is in a diffuse form, that is, the torsional vibration is expanding, the monitoring device will issue a torsional vibration diffusion alarm in the process and calculate the torsional vibration fatigue accumulated value.
Preferably, in step S4, the torsional amplitude value is calculated from the rotational speed signal, and if the torsional amplitude value is increasing, the apparatus performs a torsional vibration emission alarm and also performs a fatigue accumulation calculation.
Preferably, if the torsional amplitude value does not exceed the limited range, judging whether the rotating speed of the generator is in the required range; when the rotating speed exceeds the limited range, the device gives an alarm when the rotating speed exceeds the limit range.
Preferably, after the operating state of the motor is judged according to the voltage and current signals and the continuity thereof in step S3, if the generator is in the operating state, the subsequent processing of the rotation speed signal is performed, otherwise, the fatigue accumulated value is locked and is not increased.
Preferably, the low-pass filter described in step S2 allows a signal from a direct current to a certain cutoff frequency to pass through, and both the high-pass coefficient and the band-pass coefficient of the second-order transfer function of the general filter are set to zero, that is, a second-order low-pass filter transfer mode is obtained: for frequencies above f0, the signal falls at the rate of the square of the frequency; at frequency f0, the damping value attenuates the output signal.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
1. through the processing of the rotating speed signal, the high-frequency signal and the error caused by the interference of a signal circuit are eliminated;
2. the running state of the generator is taken as a necessary condition for the torsional vibration accumulation calculation, and the interference caused by any condition in the shutdown state of the generator is completely eliminated. The superposition of large-amplitude fatigue values caused by step change of the rotating speed when the motor is started is also avoided;
3. by means of limitation of the rotating speed range, the influence of faults and artificial operation abnormity of a rotating speed signal propagation path is eliminated, and a reminding effect is achieved for a user;
4. the fatigue accumulation error superposition caused by various operations or interferences is reduced, the accuracy of a system fatigue calculation value is enhanced, and the shutdown and inspection costs of the motor caused by false alarm are reduced
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a logic diagram of a method for eliminating the cumulative effect of motor speed disturbances on fatigue.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
A method for eliminating the influence of motor speed disturbance on fatigue accumulation comprises the following steps:
s1, collecting signals, and collecting the rotating speed information of the generator;
s2, filtering, wherein after the rotation speed signals are collected, the rotation speed signals are filtered by a low-pass filter, and the rotation speed signals near or below the fundamental frequency are left;
s3, on the basis of normal processing of the rotating speed signal, the voltage and the current of the generator are taken into consideration as the running condition of the generator;
and S4, in the running process of the generator, if the rotating speed signal is far beyond the normal running range, the monitoring device gives an alarm of abnormal rotating speed, and torsional vibration fatigue accumulation is not performed any more.
The filtering process in step S2 mainly uses a torsional vibration monitoring device for subsynchronous oscillation, and the high-frequency harmonic is not suitable for the shafting torsional vibration model established for low-frequency oscillation, so as to remove the influence of the high-frequency signal and prevent the high-frequency interference existing from the sampling of the rotation speed signal to the use.
In step S3, when the generator is not running, if a virtual signal and interference enter the signal processing system, torsional vibration fatigue still accumulates, and because the turbine is not running, there is no real fatigue accumulation, and the generator sends out a voltage and a current equivalent to a rated state and continues for a period of time, and the voltage and the current are used as a sign of normal running of the generator, and are incorporated into the signal processing logic, so that any influence caused by maintenance, testing or interference in a shutdown state is prevented.
In step S4, when a problem occurs in the transmission path of the rotation speed signal, the rotation speed signal at this time is not meaningful, and the abnormality of the rotation speed is reported.
In step S4, the rotation speed of the generator increases or decreases in a single direction, which exceeds the normal operation range, and is not the low-frequency oscillation state caused by disturbance, but the speed regulation behavior performed by the generator itself.
When the rotation speed of the generator increases or decreases in one direction in step S4, if the change of the rotation speed is in a diffuse form, that is, the torsional vibration is expanding, the monitoring device will issue a torsional vibration diffusion alarm in the process, and at the same time, calculate the torsional vibration fatigue accumulated value.
In step S4, the torsional amplitude value is calculated from the rotational speed signal, and if the torsional amplitude value is increasing, the device gives a torsional vibration dispersion alarm and performs fatigue accumulation calculation.
Judging whether the rotating speed of the generator is in a required range or not if the torsional amplitude value does not exceed the limited range; when the rotating speed exceeds the limited range, the device gives an alarm when the rotating speed exceeds the limit range.
After the operation state of the motor is judged through the voltage and current signals and the continuity thereof in the step S3, if the generator is in the operation state, the subsequent processing of the rotation speed signal is performed, otherwise, the fatigue accumulated value is locked and is not increased.
In step S2, the low-pass filter allows a signal from a direct current to a certain cutoff frequency to pass through, and both the high-pass coefficient and the band-pass coefficient of the second-order transfer function of the general filter are set to zero, that is, a second-order low-pass filter transfer mode is obtained: for frequencies above f0, the signal falls at the rate of the square of the frequency; at frequency f0, the damping value attenuates the output signal.
The principle of the invention is as follows: firstly, signals of the rotating speed, the voltage and the current of a generator are transmitted into a torsional vibration calculation system, and the rotating speed signals are firstly processed by a low-pass filter to eliminate the influence of high-frequency oscillation and interference;
after the running state of the motor is judged by using the voltage, current signals and the continuity thereof, if the generator is in the running state, the subsequent processing of the rotating speed signal is carried out, otherwise, the fatigue accumulated value is locked and is not increased any more;
after the generator is determined to be in the running state, calculating a torsional amplitude value by using a rotating speed signal, and if the torsional amplitude value is in a continuously increased state, performing torsional vibration divergence alarm by using the device and simultaneously performing fatigue accumulation calculation;
if the torsional amplitude value does not exceed the limited range, judging whether the rotating speed of the generator is in the required range or not, if the rotating speed exceeds the limited range, the device gives an alarm for the exceeding of the rotating speed so as to remind the abnormality of hardware in the process of transmitting the rotating speed signal or the rotating speed deviation caused by manual operation;
when the rotating speed value is in the normal range, the monitoring device can carry out normal accumulated calculation on the fatigue value.
In conclusion, the invention eliminates the errors caused by high-frequency signals and signal circuit interference by processing the rotating speed signals; the running state of the generator is taken as the necessary condition for the accumulative calculation of the torsional vibration, the interference caused by any condition under the condition that the generator is stopped is completely eliminated, and the superposition of large-amplitude fatigue values caused by the step change of the rotating speed when the motor is started is also avoided; by means of limitation of the rotating speed range, the influence of faults and artificial operation abnormity of a rotating speed signal propagation path is eliminated, and a reminding effect is achieved for a user; the fatigue accumulation error superposition caused by various operations or interferences is reduced, the accuracy of a system fatigue calculation value is enhanced, and the shutdown and inspection cost of the motor caused by false alarm is reduced.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method for eliminating the influence of motor speed disturbance on fatigue accumulation is characterized by comprising the following steps:
s1, collecting signals, and collecting the rotating speed information of the generator;
s2, filtering, wherein after the rotation speed signals are collected, the rotation speed signals are filtered by a low-pass filter, and the rotation speed signals near or below the fundamental frequency are left;
s3, on the basis of normal processing of the rotating speed signal, the voltage and the current of the generator are taken into consideration as the running condition of the generator;
and S4, in the running process of the generator, if the rotating speed signal is far beyond the normal running range, the monitoring device gives an alarm of abnormal rotating speed, and torsional vibration fatigue accumulation is not performed any more.
2. The method for eliminating the influence of the motor speed disturbance on the fatigue accumulation according to claim 1, wherein the method comprises the following steps: the filtering process described in step S2 mainly uses a torsional vibration monitoring device for sub-synchronous oscillation, and the high-frequency harmonic is not suitable for the shafting torsional vibration model established for low-frequency oscillation, so as to remove the influence of the high-frequency signal and prevent the high-frequency interference existing from the sampling of the rotation speed signal to the use.
3. The method for eliminating the influence of the motor speed disturbance on the fatigue accumulation according to claim 1, wherein the method comprises the following steps: in step S3, when the generator is not running, if there is a virtual signal and interference entering the signal processing system, there is still torsional vibration fatigue accumulation, and there is no real fatigue accumulation because the turbine is not running, the generator sends out a voltage and a current equivalent to the rated state and continues for a period of time, which are used as the signs of normal running of the generator, and incorporates the signal processing logic, so as to prevent any influence caused by maintenance, testing or interference in the shutdown state.
4. The method for eliminating the influence of the motor speed disturbance on the fatigue accumulation according to claim 1, wherein the method comprises the following steps: in step S4, a problem occurs in the transmission path of the rotation speed signal, and the rotation speed signal at this time is not meaningful, and when the rotation speed abnormality is reported.
5. The method for eliminating the influence of the motor speed disturbance on the fatigue accumulation according to claim 4, wherein the method comprises the following steps: in step S4, the rotation speed of the generator increases or decreases in a single direction, which exceeds the normal operation range, and is not the low-frequency oscillation state caused by disturbance, but the speed regulation behavior of the generator itself, and because the rotation speed deviates from the fundamental frequency range, the shafting torsional vibration model is no longer applicable, and the monitoring device should report the abnormal rotation speed and no longer perform the fatigue accumulation calculation.
6. The method for eliminating the influence of the motor speed disturbance on the fatigue accumulation according to claim 5, wherein the method comprises the following steps: when the rotation speed of the generator increases or decreases in one direction in step S4, if the change of the rotation speed is in a diffusion state, that is, the torsional vibration is continuously enlarged, the monitoring device will send out an alarm of the torsional vibration diffusion in the process, and at the same time, calculate the fatigue cumulative value of the torsional vibration.
7. The method for eliminating the influence of the motor speed disturbance on the fatigue accumulation according to claim 1, wherein the method comprises the following steps: in step S4, the torsional amplitude value is calculated from the rotational speed signal, and if the torsional amplitude value is in a state of increasing, the device gives a torsional vibration emission alarm and performs fatigue accumulation calculation.
8. The method for eliminating the influence of the motor speed disturbance on the fatigue accumulation according to claim 7, wherein the method comprises the following steps: if the torsional amplitude value does not exceed the limited range, judging whether the rotating speed of the generator is in the required range; when the rotating speed exceeds the limited range, the device gives an alarm when the rotating speed exceeds the limit range.
9. The method for eliminating the influence of the motor speed disturbance on the fatigue accumulation according to claim 1, wherein the method comprises the following steps: and step S3, after the running state of the motor is judged according to the voltage and current signals and the continuity thereof, if the generator is in the running state, the subsequent processing of the rotating speed signal is carried out, otherwise, the fatigue accumulated value is locked and is not increased any more.
10. The method for eliminating the influence of the motor speed disturbance on the fatigue accumulation according to claim 1, wherein the method comprises the following steps: the low-pass filter described in step S2 allows a signal from a direct current to a certain cutoff frequency to pass through, and both the high-pass and band-pass coefficients of the second-order transfer function of the general filter are set to zero, that is, a second-order low-pass filter transfer mode is obtained: for frequencies above f0, the signal falls at the rate of the square of the frequency; at frequency f0, the damping value attenuates the output signal.
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| CN114499057A (en) * | 2022-03-14 | 2022-05-13 | 浙江大学 | Method for eliminating magnetic interference of brushless direct current motor |
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