CN108252753B - Method, device and equipment for filtering interference signals - Google Patents
Method, device and equipment for filtering interference signals Download PDFInfo
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- CN108252753B CN108252753B CN201810045473.1A CN201810045473A CN108252753B CN 108252753 B CN108252753 B CN 108252753B CN 201810045473 A CN201810045473 A CN 201810045473A CN 108252753 B CN108252753 B CN 108252753B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/01—Purpose of the control system
- F05D2270/02—Purpose of the control system to control rotational speed (n)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/304—Spool rotational speed
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Abstract
The invention discloses a method, a device and equipment for filtering interference signals, wherein the method comprises the following steps: acquiring a target signal, wherein the target signal is a superimposed signal of a rotating speed signal and an interference signal, and the interference signal comprises a power frequency interference signal; and filtering a power frequency interference signal in the target signal by adopting the target signal in a first preset period, wherein the ratio of the first preset period to the power frequency interference signal period is a positive integer. Therefore, by adopting the mode of the target signal within the integral multiple of the period time of the power frequency interference signal, the influence that the time when the superimposed signal reaches a certain threshold value is advanced or lagged due to the power frequency interference signal can be eliminated, namely, the power frequency interference signal with lower frequency in the superimposed signal is filtered, so that the accurate rotating speed of the steam turbine can be obtained, and the rotating speed of the steam turbine can be controlled more accurately and actually.
Description
Technical Field
The invention relates to the technical field of industrial control, in particular to a method, a device and equipment for filtering interference signals.
Background
At present, most of thermal power plants in China mainly adopt a form that a steam turbine generates electricity by utilizing waste heat. Since the rotating speed of the steam turbine has a great influence on the generated power, it is important to control the rotating speed of the steam turbine.
In the prior art, in order to realize rapid sampling of the rotating speed and ensure real-time performance of the measured rotating speed, a rotating speed signal within a short time period in a rotating speed signal measured by a rotating speed sensor is generally adopted, a series of processing is performed on the rotating speed signal within the time period so as to obtain the rotating speed, and the rotating speed of the steam turbine is controlled according to the obtained rotating speed.
However, the inventor finds that a lot of interference signals exist in the site of turbine power generation, the interference signals affect the rotation speed signals of the turbine, so that the signals obtained by superimposing the rotation speed signals and the interference signals are actually adopted, and the method of processing the signals in a short time period is high-speed sampling processing, so that the interference signals in the signals cannot be completely filtered, especially the power frequency interference signals with low frequency cannot be filtered, and therefore, the accurate rotation speed of the turbine cannot be obtained, and further the actual control of the rotation speed of the turbine is affected.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method, a device and equipment for filtering interference signals, which can obtain accurate rotating speed of a steam turbine and further can more accurately and actually control the rotating speed of the steam turbine except for power frequency interference signals with lower frequency in superimposed signals of rotating speed signals and interference signals.
In a first aspect, an embodiment of the present invention provides a method for filtering an interference signal, where the method includes:
acquiring a target signal, wherein the target signal is a superimposed signal of a rotating speed signal and an interference signal, and the interference signal comprises a power frequency interference signal;
and filtering a power frequency interference signal in the target signal by adopting the target signal in a first preset period, wherein the ratio of the first preset period to the power frequency interference signal period is a positive integer.
Preferably, the step of filtering the power frequency interference signal in the target signal by adopting the target signal in a first preset period specifically comprises:
if the frequency of the target signal is lower than a preset frequency, filtering a power frequency interference signal in the target signal by adopting the target signal in a first preset period, wherein the ratio of the first preset period to the power frequency interference signal period is a positive integer.
Preferably, the method further comprises the following steps:
and if the frequency of the target signal is higher than the preset frequency, filtering out a power frequency interference signal in the target signal by adopting high-pass filtering.
Preferably, the first preset period is 20ms of the power frequency interference signal period.
In a second aspect, an embodiment of the present invention provides an apparatus for filtering an interference signal, including:
the acquisition unit is used for acquiring the target signal, the target signal is a superimposed signal of a rotating speed signal and an interference signal, and the interference signal comprises a power frequency interference signal;
the first filtering unit is used for filtering a power frequency interference signal in a target signal by adopting the target signal in a first preset period, and the ratio of the first preset period to the power frequency interference signal period is a positive integer.
Preferably, the first filtering unit is specifically configured to filter a power frequency interference signal in the target signal by using the target signal within a first preset period if the frequency of the target signal is lower than a preset frequency, where a ratio of the first preset period to the power frequency interference signal period is a positive integer.
Preferably, the method further comprises the following steps:
and the second filtering module is used for filtering a power frequency interference signal in the target signal by adopting high-pass filtering if the frequency of the target signal is higher than a preset frequency.
Preferably, the first preset period is 20ms of the power frequency interference signal period.
In a third aspect, an embodiment of the present invention provides an apparatus for filtering an interference signal, where the apparatus includes: the sampling circuit is connected with the signal processor and at least consists of an amplifying circuit and a Schmitt hysteresis circuit;
the sampling circuit is used for acquiring a target signal, sampling the target signal through an amplifying circuit and a Schmidt hysteresis circuit and sending the target signal to the signal processor, wherein the target signal is a superposed signal of a rotating speed signal and an interference signal, and the interference signal comprises a power frequency interference signal;
the signal processor is used for filtering a power frequency interference signal in a target signal by adopting the target signal which passes through the sampling circuit within a first preset period, and the ratio of the first preset period to the power frequency interference signal period is a positive integer.
Preferably, the device comprises a judging module, a sampling circuit and a signal processor;
the judging module is used for judging whether the frequency of the target signal is lower than a preset frequency or not;
the sampling circuit is used for acquiring a target signal if the frequency of the target signal is lower than the preset frequency, sampling the target signal through an amplifying circuit and a Schmidt hysteresis circuit and sending the target signal to the signal processor, wherein the target signal is a superposed signal of a rotating speed signal and an interference signal, and the interference signal comprises a power frequency interference signal;
the signal processor is used for filtering a power frequency interference signal in a target signal which passes through the sampling circuit within a first preset period, and sending the target signal to the processor, wherein the ratio of the first preset period to the power frequency interference signal period is a positive integer.
Preferably, the method further comprises the following steps: the judgment module is connected with the high-pass filter circuit, and the high-pass filter circuit is connected with the sampling circuit;
the high-pass filter circuit is used for filtering a power frequency interference signal in the target signal by adopting high-pass filtering and sending the power frequency interference signal to the sampling circuit if the frequency of the target signal is higher than a preset frequency, wherein the target signal is a superimposed signal of a rotating speed signal and an interference signal, and the interference signal comprises the power frequency interference signal;
the sampling circuit is used for sampling the target signal passing through the high-pass filter circuit through the amplifying circuit and the Schmidt hysteresis circuit and sending the target signal to the signal processor;
the signal processor is further configured to take a target signal passing through the sampling circuit within a second preset period and send the target signal to the processor, where the second preset period is smaller than the first preset period.
Preferably, the first preset period is 20ms of the power frequency interference signal period.
Preferably, the sampling circuit is at least composed of a low-pass filter circuit, an amplifying circuit and a schmitt hysteresis circuit.
Compared with the prior art, the invention has at least the following advantages:
by adopting the technical scheme of the embodiment of the invention, firstly, a transmitted target signal is obtained, wherein the target signal is a superimposed signal of a rotating speed signal and an interference signal, and the interference signal comprises a power frequency interference signal; then, a power frequency interference signal in the target signal is filtered in a mode of adopting the target signal in a first preset period, and the ratio of the first preset period to the power frequency interference signal period is a positive integer. Therefore, by adopting the mode of the target signal within the integral multiple of the period time of the power frequency interference signal, the influence that the time when the superimposed signal reaches a certain threshold value is advanced or lagged due to the power frequency interference signal can be eliminated, namely, the power frequency interference signal with lower frequency in the superimposed signal is filtered, so that the accurate rotating speed of the steam turbine can be obtained, and the rotating speed of the steam turbine can be controlled more accurately and actually.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a system framework involved in an application scenario according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a method for filtering an interference signal according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the influence of power frequency interference signals on the rotation speed signals;
fig. 4 is a schematic flowchart of another method for filtering an interference signal according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an apparatus for filtering an interference signal according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an apparatus for filtering an interference signal according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another apparatus for filtering an interference signal according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another apparatus for filtering an interference signal according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another apparatus for filtering an interference signal according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, in order to realize rapid sampling of the rotating speed of the steam turbine and ensure the real-time performance of the measured rotating speed so as to control the rotating speed of the steam turbine in real time, generally, firstly, a rotating speed signal in a short time period in the rotating speed signal measured by a rotating speed sensor is adopted; then, carrying out a series of processing on the rotation speed signal in the time period so as to obtain the rotation speed; for example, the rotation speed signal detected and transmitted by the rotation speed sensor is the rotation speed signal transmitted by the rotation speed sensor within 10ms, the sampling signal within 10ms is processed and calculated to obtain the rotation speed, and finally, the rotation speed of the steam turbine is controlled according to the obtained rotation speed.
However, the inventor of the present invention has found through research that many interference signals exist in a site where a steam turbine generates electricity, for example, a very common 50Hz power frequency interference signal generated by using 220V voltage for daily life electricity, the interference signal may affect a rotation speed signal of the steam turbine, so that a signal obtained by superimposing the rotation speed signal and the interference signal is actually adopted, and a method of processing the signal in a short time period is a high-speed sampling process.
In order to solve the problem, in the embodiment of the present invention, first, a transmitted target signal is obtained, where the target signal is a superimposed signal of a rotation speed signal and an interference signal, and the interference signal includes a power frequency interference signal; then, a power frequency interference signal in the target signal is filtered in a mode of adopting the target signal in a first preset period, and the ratio of the first preset period to the power frequency interference signal period is a positive integer. Therefore, by adopting the mode of the target signal within the integral multiple of the period time of the power frequency interference signal, the influence that the time when the superimposed signal reaches a certain threshold value is advanced or lagged due to the power frequency interference signal can be eliminated, namely, the power frequency interference signal with lower frequency in the superimposed signal is filtered, so that the accurate rotating speed of the steam turbine can be obtained, and the rotating speed of the steam turbine can be controlled more accurately and actually.
For example, one of the scenarios of the embodiment of the present invention may be applied to the scenario shown in fig. 1. The scene comprises a rotation speed sensor 101, a signal processor 102 and a processor 103, wherein the rotation speed sensor 101 is interacted with the signal processor 102, and the signal processor 102 is interacted with the processor 103. The rotating speed sensor 101 measures the rotating speed of the steam turbine in real time to generate a rotating speed signal, the rotating speed signal is transmitted to the signal processor 102 and is influenced by the power frequency interference signal in the transmission process, and the signal processor 102 obtains a target signal obtained by overlapping the rotating speed signal and the power frequency interference signal; the signal processor 102 filters the power frequency interference signal in the target signal by intercepting the target signal within a time period which is integral multiple of the period of the power frequency interference signal; the signal processor 102 transmits the target signal with the power frequency interference signal filtered out to the processor 103, so that the processor 103 calculates and obtains the real rotating speed of the steam turbine.
It is to be understood that, in the above application scenarios, although the actions of the embodiments of the present invention are described as being performed by the signal processor 102, the present invention is not limited in terms of the subject of execution, as long as the actions disclosed in the embodiments of the present invention are performed.
It is to be understood that the above scenario is only one scenario example provided by the embodiment of the present invention, and the embodiment of the present invention is not limited to this scenario.
The following describes in detail a specific implementation manner of the method, the apparatus, and the device for filtering an interference signal according to the embodiments of the present invention with reference to the accompanying drawings.
Exemplary method
Referring to fig. 2, a flowchart of a method for filtering an interference signal according to an embodiment of the present invention is shown. In this embodiment, the method may include, for example, the steps of:
step 201: and acquiring a target signal, wherein the target signal is a superimposed signal of a rotating speed signal and an interference signal, and the interference signal comprises a power frequency interference signal.
It is understood that a rotation speed sensor is installed on the steam turbine, the rotation speed sensor can measure the rotation speed of the steam turbine in real time to generate a rotation speed signal, and in order to process the rotation speed signal to calculate the rotation speed of the steam turbine, the rotation speed sensor needs to send the measured rotation speed signal to the signal processor, that is, step 201. Due to the fact that the field environment of the transmission signal is complex, a lot of interference signals exist, for example, high-frequency interference signals generated by communication of a smart phone, a smart watch and the like, or power frequency interference signals of 50Hz generated by 220V voltage commonly used by equipment, the rotating speed signal can be influenced by the interference signals in the rotating speed signal transmission process, and particularly is easily influenced by the power frequency interference signals. Specifically, the signal processor receives a superimposed signal of the rotating speed signal and the interference signal, and at least the superimposed signal of the rotating speed signal and the power frequency interference signal.
Step 202: and filtering a power frequency interference signal in the target signal by adopting the target signal in a first preset period, wherein the ratio of the first preset period to the power frequency interference signal period is a positive integer.
It can be understood that, according to the statistical analysis of the influence of the power frequency interference signal on the rotation speed signal, a schematic diagram of the influence of the power frequency interference signal on the rotation speed signal as shown in fig. 3 can be obtained. The black sinusoidal curve with a smaller period is the waveform of a 1k rotating speed signal, the black sinusoidal curve with a larger period is the waveform of a 50Hz power frequency interference signal, the white sinusoidal curve is the waveform of a target signal obtained by superposing the 1k rotating speed signal and the 50Hz power frequency interference signal, and the thicker black straight line is a preset voltage threshold. Overall, the timing at which the superimposed target signal reaches the predetermined voltage threshold is advanced and delayed with respect to the rotational speed signal.
Specifically, in the first half period of the power frequency interference signal, the time when the target signal relative to the rotational speed signal reaches the preset voltage threshold is all advanced, and in the second half period of the power frequency interference signal, the time when the target signal relative to the rotational speed signal reaches the preset voltage threshold is all delayed. Therefore, for example, the value of the first preset period is half of the period of the interference signal, that is, taking the target signal in the half of the period of the interference signal will affect 2 Δ t before and after 2 moments of reaching the preset voltage threshold; for example, the value of the first preset period is 1 interference signal period, that is, if a target signal in 1 interference signal period is adopted, the leading or lagging time of 2 times before and after reaching the preset voltage threshold is consistent, so that the leading or lagging time can be mutually cancelled. In summary, by adopting the target signal in the specific period, the interference influence caused by the specific frequency and the higher harmonics thereof can be eliminated, that is, the interference signal of the specific frequency in the target signal is filtered, and for the power frequency interference signal of 50Hz, by adopting the target signal in the power frequency interference signal period of the integral multiple, the power frequency interference signal of 50Hz in the target signal can be filtered.
The rotation speed of the steam turbine is gradually increased in a constant manner, and the frequency of the target signal acquired in step 201 is also gradually increased. For the whole process, by adopting the mode of the target signal in the integral multiple of the power frequency interference signal period, the power frequency interference signal in the target signal can be filtered, and the influence caused by the power frequency interference signal is well inhibited, but the problem that the response time is limited by the power frequency interference signal period exists by adopting the mode of the target signal in at least 1 interference signal period. In this case, for the target signal with a lower frequency, the power frequency interference signal in the target signal is filtered out in the step 202; for the target signal with higher frequency, a high-pass filtering mode can be adopted to filter the power frequency interference signal in the target signal. Thus, in some embodiments of this embodiment, the following is specifically shown:
a. if the frequency of the target signal is lower than a preset frequency, filtering a power frequency interference signal in the target signal by adopting the target signal in a first preset period, wherein the ratio of the first preset period to the power frequency interference signal period is a positive integer;
b. and if the frequency of the target signal is higher than the preset frequency, filtering out a power frequency interference signal in the target signal by adopting high-pass filtering.
When the frequency of the target signal is lower than a preset frequency, the difference between the frequency of the target signal and the frequency of the power frequency interference signal of 50Hz is not large, and the power frequency interference signal in the target signal can be filtered only by adopting a mode of the target signal in an integral multiple of the period of the power frequency interference signal; and when the frequency of the target signal is higher than the preset frequency, the difference between the frequency of the target signal and the frequency of the power frequency interference signal is larger, and because the high-pass filtering can pass through the rotating speed signal with higher frequency to filter the power frequency interference signal with lower frequency of 50Hz, at the moment, the power frequency interference signal in the target signal can be filtered by selecting the high-pass filtering mode, and the accurate rotating speed can still be calculated by subsequently adopting the target signal which is subjected to the high-pass filtering in a smaller period. It should be noted that, when the frequency of the target signal is higher than the preset frequency, the high-pass filtering mode is selected, which not only can solve the problem that the field rotation speed signal is affected by the power frequency interference signal, but also can realize rapid sampling, and ensure the real-time performance of the measured rotation speed data.
It should be further noted that, in the above-mentioned manner of adopting the target signal within the integral multiple of the power frequency interference signal period, there is a problem that the response time is limited by the power frequency interference signal period, and in order to reduce the influence of the limitation, in this embodiment, the first preset period is 20ms of the power frequency interference signal period. Namely, on the premise that the ratio of the first preset period to the power frequency interference signal period is a positive integer, the minimum first preset period is determined to be 1 power frequency interference signal period of 20ms, and compared with 40ms, 60ms, 80ms and the like, the limitation of the power frequency interference signal period on the response time can be greatly reduced.
It can be understood that, in order to obtain the rotation speed through calculation conveniently, the target signal may pass through a sampling circuit including an amplifying circuit and a schmitt hysteresis circuit, specifically, if the frequency of the target signal is lower than a preset frequency, the target signal is sampled by the sampling circuit, and by taking the target signal passing through the sampling circuit within a first preset period, a power frequency interference signal in the target signal passing through the sampling circuit is filtered out, where a ratio of the first preset period to the power frequency interference signal period is a positive integer; if the frequency of the target signal is higher than the preset frequency, a high-pass filter is adopted to filter power frequency interference signals in the target signal, and the target signal which is subjected to the high-pass filter in a second preset period is adopted through the sampling circuit. Because the amplifying circuit is used for amplifying signals, and the Schmidt hysteresis circuit is used for converting sinusoidal signals into square wave signals with the same frequency, the processor obtains the signals processed by the signal processor, the edges of the square wave signals with the same frequency are convenient to count, and the frequency of the square wave signals with the same frequency is obtained.
It should be noted that, because the interference signals existing in the transmission signal field may include high-frequency interference signals of about several GHz generated by communications of smart phones, smart watches, and the like, in order to filter these high-frequency interference signals, a low-pass filter circuit is added in the sampling circuit, and the high-frequency interference signals of about several GHz with higher frequencies are filtered through a rotation speed signal with lower frequencies relative to the high-frequency interference signals.
According to various implementation manners provided by the embodiment, firstly, a transmitted target signal is obtained, wherein the target signal is a superimposed signal of a rotating speed signal and an interference signal, and the interference signal comprises a power frequency interference signal; then, a power frequency interference signal in the target signal is filtered in a mode of adopting the target signal in a first preset period, and the ratio of the first preset period to the power frequency interference signal period is a positive integer. Therefore, by adopting the mode of the target signal within the integral multiple of the period time of the power frequency interference signal, the influence that the time when the superimposed signal reaches a certain threshold value is advanced or lagged due to the power frequency interference signal can be eliminated, namely, the power frequency interference signal with lower frequency in the superimposed signal is filtered, so that the accurate rotating speed of the steam turbine can be obtained, and the rotating speed of the steam turbine can be controlled more accurately and actually.
In the following, with reference to fig. 4, a specific implementation manner of the method for filtering an interference signal in an embodiment of the present invention in practical application is described in detail by using another embodiment.
Referring to fig. 4, a flowchart of another method for filtering an interference signal according to an embodiment of the present invention is shown. In this embodiment, the method may include, for example, the steps of:
step 401: and acquiring a target signal, wherein the target signal is a superimposed signal of a rotating speed signal and an interference signal, and the interference signal comprises a power frequency interference signal.
Step 402: judging that the frequency of the target signal is lower than a preset frequency, if so, entering step 403; if not, go to step 405.
Step 403: and sampling the target signal by a sampling circuit, wherein the sampling circuit consists of a low-pass filter circuit, an amplifying circuit and a Schmidt hysteresis circuit.
Step 404: and filtering a power frequency interference signal in the target signal by adopting the target signal which passes through the sampling circuit within 20ms, and sending the target signal to a processor.
Step 405: and filtering the power frequency interference signal in the target signal by adopting high-pass filtering.
Step 406: and adopting the target signal subjected to the high-pass filtering within 2ms through the sampling circuit and sending the target signal to a processor.
According to various implementation manners provided by the embodiment, firstly, a transmitted target signal is obtained, wherein the target signal is a superimposed signal of a rotating speed signal and an interference signal, and the interference signal comprises a power frequency interference signal; then, a power frequency interference signal in the target signal is filtered in a mode of adopting the target signal in a first preset period, and the ratio of the first preset period to the power frequency interference signal period is a positive integer. Therefore, by adopting the mode of the target signal within the integral multiple of the period time of the power frequency interference signal, the influence that the time when the superimposed signal reaches a certain threshold value is advanced or lagged due to the power frequency interference signal can be eliminated, namely, the power frequency interference signal with lower frequency in the superimposed signal is filtered, so that the accurate rotating speed of the steam turbine can be obtained, and the rotating speed of the steam turbine can be controlled more accurately and actually.
Exemplary devices
Referring to fig. 5, a schematic structural diagram of an apparatus for filtering an interference signal according to an embodiment of the present invention is shown. In this embodiment, the apparatus may specifically include:
an obtaining unit 501, configured to obtain the target signal, where the target signal is a superimposed signal of a rotation speed signal and an interference signal, and the interference signal includes a power frequency interference signal;
the first filtering unit 502 is configured to filter a power frequency interference signal in a target signal by using the target signal within a first preset period, where a ratio of the first preset period to the power frequency interference signal period is a positive integer.
Optionally, the first filtering unit 502 is specifically configured to, if the frequency of the target signal is lower than a preset frequency, filter a power frequency interference signal in the target signal by using the target signal within a first preset period, where a ratio of the first preset period to the power frequency interference signal period is a positive integer.
Optionally, the apparatus further comprises:
and the second filtering module is used for filtering a power frequency interference signal in the target signal by adopting high-pass filtering if the frequency of the target signal is higher than a preset frequency.
Optionally, the first preset period is 20ms of the power frequency interference signal period.
Through various implementation manners provided by this embodiment, the obtaining unit is configured to obtain the target signal, where the target signal is a superimposed signal of a rotation speed signal and an interference signal, and the interference signal includes a power frequency interference signal; the first filtering unit is used for filtering a power frequency interference signal in a target signal by adopting the target signal in a first preset period, and the ratio of the first preset period to the power frequency interference signal period is a positive integer. Therefore, by adopting the mode of the target signal within the integral multiple of the period time of the power frequency interference signal, the influence that the time when the superimposed signal reaches a certain threshold value is advanced or lagged due to the power frequency interference signal can be eliminated, namely, the power frequency interference signal with lower frequency in the superimposed signal is filtered, so that the accurate rotating speed of the steam turbine can be obtained, and the rotating speed of the steam turbine can be controlled more accurately and actually.
Exemplary device
Referring to fig. 6, a schematic structural diagram of an apparatus for filtering an interference signal in an embodiment of the present invention is shown. In this embodiment, the device may specifically include:
the sampling circuit 601 and the signal processor 602, the sampling circuit 601 is connected with the signal processor 602, the sampling circuit 601 at least consists of an amplifying circuit and a Schmidt hysteresis circuit;
the sampling circuit 601 is configured to obtain a target signal, sample the target signal through an amplifying circuit and a schmitt hysteresis circuit, and send the target signal to the signal processor 602, where the target signal is a superimposed signal of a rotation speed signal and an interference signal, and the interference signal includes a power frequency interference signal;
the signal processor 602 is configured to filter a power frequency interference signal in a target signal that passes through the sampling circuit 601 within a first preset period, where a ratio of the first preset period to the power frequency interference signal period is a positive integer.
It should be noted that the frequency of the acquired target signal also gradually increases, and the target signal within an integral multiple of the power frequency interference signal period is adopted, so that the influence caused by the power frequency interference signal is obviously well suppressed, but the target signal within at least 1 interference signal period is adopted, so that the response time is limited by the power frequency interference signal period. At this time, whether the frequency of the target signal is lower than a preset frequency needs to be judged, if so, the difference between the frequency of the target signal and the frequency of the power frequency interference signal is not large, and only a mode of adopting the target signal in an integral multiple of the period of the power frequency interference signal can be selected to filter the power frequency interference signal in the target signal. Therefore, in this embodiment, as shown in fig. 7, the system includes a determining module 701, a sampling circuit 601, and a signal processor 602;
the determining module 701 is configured to determine whether the frequency of the target signal is lower than a preset frequency;
the sampling circuit 601 is configured to obtain a target signal if the frequency of the target signal is lower than the preset frequency, sample the target signal through an amplifying circuit and a schmitt hysteresis circuit, and send the target signal to the signal processor 602, where the target signal is a superimposed signal of a rotation speed signal and an interference signal, and the interference signal includes a power frequency interference signal;
the signal processor 602 is configured to take a target signal that passes through the sampling circuit 601 within a first preset period, filter a power frequency interference signal in the target signal, and send the target signal to the processor, where a ratio of the first preset period to the power frequency interference signal period is a positive integer.
It should be noted that, when the determining module 701 determines that the frequency of the target signal is not lower than the preset frequency, it indicates that the difference between the frequency of the target signal and the frequency of the power frequency interference signal is relatively large, and a high-pass filtering manner is adopted to filter the power frequency interference signal in the target signal, so that the phenomenon that the field rotation speed signal is affected by the power frequency interference signal can be solved, quick sampling can be realized, and the real-time performance of the measured rotation speed data is ensured. Therefore, in this embodiment, as shown in fig. 8, a high-pass filter circuit 801 is added on the basis of fig. 7, the determining module 701 is connected to the high-pass filter circuit 801, and the high-pass filter circuit 801 is connected to the sampling circuit 601;
the high-pass filter circuit 801 is configured to, if the frequency of the target signal is higher than a preset frequency, filter a power frequency interference signal in the target signal by using high-pass filtering and send the power frequency interference signal to the sampling circuit 601, where the target signal is a superimposed signal of a rotation speed signal and an interference signal, and the interference signal includes the power frequency interference signal;
the sampling circuit 601 is configured to sample the target signal passing through the high-pass filter circuit 801 through an amplifying circuit and a schmitt hysteresis circuit, and send the target signal to the signal processor 602;
the signal processor 602 is further configured to adopt a target signal that passes through the sampling circuit 601 in a second preset period and send the target signal to the processor, where the second preset period is smaller than the first preset period.
It should be noted that, on the premise that the ratio of the first preset period to the power frequency interference signal period is a positive integer, the first preset period is determined to be the power frequency interference signal period of 20ms, so that the limitation of the power frequency interference signal period to the response time can be greatly reduced.
It should be noted that, since the interference signals existing in the transmission signal field may include high-frequency interference signals of about several GHz generated by communications of smart phones, smart watches, and the like, in order to filter these high-frequency interference signals, in this embodiment, the sampling circuit 601 at least includes a low-pass filter circuit, an amplifying circuit, and a schmitt hysteresis circuit.
For example, as shown in fig. 9, a schematic structural diagram of another apparatus for filtering an interference signal in the embodiment of the present invention, the determining module 901 is the determining module 701; the sampling circuit 902 is the sampling circuit 601, and the sampling circuit 902 is composed of a low-pass filter circuit, an amplifying circuit and a schmitt hysteresis circuit; the high-pass filter circuit 903 is the high-pass filter circuit 801; the signal processor 904 is the signal processor 602.
Through various implementation manners provided by this embodiment, the sampling circuit is connected with the signal processor, and the sampling circuit is at least composed of an amplifying circuit and a schmitt hysteresis circuit; the sampling circuit is used for acquiring a target signal, sampling the target signal through an amplifying circuit and a Schmidt hysteresis circuit and sending the target signal to the signal processor, wherein the target signal is a superposed signal of a rotating speed signal and an interference signal, and the interference signal comprises a power frequency interference signal; the signal processor is used for filtering a power frequency interference signal in a target signal by adopting the target signal which passes through the sampling circuit within a first preset period, and the ratio of the first preset period to the power frequency interference signal period is a positive integer. Therefore, by adopting the mode of the target signal within the integral multiple of the period time of the power frequency interference signal, the influence that the time when the superimposed signal reaches a certain threshold value is advanced or lagged due to the power frequency interference signal can be eliminated, namely, the power frequency interference signal with lower frequency in the superimposed signal is filtered, so that the accurate rotating speed of the steam turbine can be obtained, and the rotating speed of the steam turbine can be controlled more accurately and actually.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. 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 identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (7)
1. A method for filtering an interference signal, comprising:
acquiring a target signal, wherein the target signal is a superimposed signal of a rotating speed signal and an interference signal of a rapid sampling steam turbine, and the interference signal comprises a power frequency interference signal;
the method comprises the following steps of filtering a power frequency interference signal in a target signal by adopting the target signal in a first preset period, wherein the power frequency interference signal in the target signal is filtered by adopting the target signal in the first preset period, and specifically comprises the following steps:
if the frequency of the target signal is lower than a preset frequency, filtering a power frequency interference signal in the target signal by adopting the target signal in a first preset period, wherein the ratio of the first preset period to the power frequency interference signal period is a positive integer; the first preset period is at least 20 milliseconds;
and if the frequency of the target signal is higher than the preset frequency, filtering out a power frequency interference signal in the target signal by adopting high-pass filtering.
2. The method of claim 1, wherein the first predetermined period is 20ms of the power frequency interference signal period.
3. An apparatus for filtering an interference signal, comprising:
the system comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring a target signal, the target signal is a superposed signal of a rotating speed signal and an interference signal of a rapid sampling steam turbine, and the interference signal comprises a power frequency interference signal;
the first filtering unit is specifically configured to filter a power frequency interference signal in the target signal by using the target signal within a first preset period if the frequency of the target signal is lower than a preset frequency, where a ratio of the first preset period to the power frequency interference signal period is a positive integer; the first preset period is at least 20 milliseconds;
and the second filtering module is used for filtering a power frequency interference signal in the target signal by adopting high-pass filtering if the frequency of the target signal is higher than a preset frequency.
4. The apparatus of claim 3, wherein the first predetermined period is 20ms of the power frequency interference signal period.
5. An apparatus for filtering an interference signal, comprising: the sampling circuit is connected with the signal processor and at least consists of an amplifying circuit and a Schmitt hysteresis circuit;
the device also comprises a judging module;
the judging module is used for judging whether the frequency of the target signal is lower than a preset frequency or not;
the sampling circuit is used for acquiring a target signal if the frequency of the target signal is lower than the preset frequency, sampling the target signal through an amplifying circuit and a Schmidt hysteresis circuit and sending the target signal to the signal processor, wherein the target signal is a superposed signal of a rotating speed signal and an interference signal, and the interference signal comprises a power frequency interference signal;
the signal processor is used for filtering a power frequency interference signal in a target signal which passes through the sampling circuit within a first preset period, and sending the target signal to the processor, wherein the ratio of the first preset period to the power frequency interference signal period is a positive integer; wherein the first preset period is at least 20 milliseconds;
the judgment module is connected with the high-pass filter circuit, and the high-pass filter circuit is connected with the sampling circuit;
the high-pass filter circuit is used for filtering a power frequency interference signal in the target signal by adopting high-pass filtering and sending the power frequency interference signal to the sampling circuit if the frequency of the target signal is higher than a preset frequency, wherein the target signal is a superimposed signal of a rotating speed signal and an interference signal, and the interference signal comprises the power frequency interference signal;
the sampling circuit is used for sampling the target signal passing through the high-pass filter circuit through the amplifying circuit and the Schmidt hysteresis circuit and sending the target signal to the signal processor;
the signal processor is further configured to take a target signal passing through the sampling circuit within a second preset period and send the target signal to the processor, where the second preset period is smaller than the first preset period.
6. The apparatus according to claim 5, wherein the first predetermined period is 20ms of the power frequency interference signal period.
7. The apparatus of claim 5, wherein the sampling circuit is comprised of at least a low pass filter circuit, an amplification circuit, and a Schmitt-hysteretic circuit.
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