CN113156229B - Online measuring device and method for noise interference level of second-order advanced observer - Google Patents
Online measuring device and method for noise interference level of second-order advanced observer Download PDFInfo
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- CN113156229B CN113156229B CN202110488925.5A CN202110488925A CN113156229B CN 113156229 B CN113156229 B CN 113156229B CN 202110488925 A CN202110488925 A CN 202110488925A CN 113156229 B CN113156229 B CN 113156229B
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Abstract
The invention discloses an online measuring device and method for noise interference level of a second-order advanced observer, wherein the online measuring device comprises: the high-pass filter A is connected with the input end of the second-order advanced observer and used for acquiring an input signal of the second-order advanced observer to obtain a high-pass filtering signal A; the high-pass filter B is connected with the output end of the second-order advanced observer and used for acquiring an output signal of the second-order advanced observer so as to obtain a high-pass filtering signal B; and the noise amplitude gain value calculation module is used for calculating the amplitude noise gain according to the high-pass filtering signal A and the high-pass filtering signal B to obtain a noise amplitude gain value. Therefore, the high-frequency noise amplitude gain condition of the second-order advanced observer is continuously measured under the condition that the online work of the second-order advanced observer is not influenced, and the noise interference level of the second-order advanced observer is judged, so that the online work of the second-order advanced observer is better adjusted.
Description
Technical Field
The invention relates to the technical field of process control of thermal power generating units, in particular to an online measuring device and method for noise interference level of a second-order advanced observer.
Background
In the field of thermal power unit process control, advance information of process response can be acquired by using the advance observer, and the advance observer has important significance for improving process control performance. The advance observer has various forms, such as a Differentiator (D), a Proportional-Derivative (PD) controller, and the like. However, the advance observer has a problem of High frequency noise interference amplification, and when the High frequency noise interference level is High, for example, High Frequency Noise Amplitude Gain (HFNAG) is High, the High frequency noise amplitude gain may cause serious interference to the output signal of the advance observer, and even cause the advance observer to fail to work normally. In order to fully utilize the advantages of advanced observation in process control and control the advanced observation at a lower high-frequency noise interference level, the problem of online judgment of the high-frequency noise interference level of the advanced observation needs to be solved, and the high-frequency noise amplitude gain reflects the high-frequency noise interference level to a certain extent.
Disclosure of Invention
The invention aims to provide an online measuring device and method for the noise interference level of a second-order advanced observer, which utilize noise signals contained in process signals to continuously measure the high-frequency noise amplitude gain condition of the second-order advanced observer under the condition of not influencing the online work of the second-order advanced observer and judge the noise interference level of the second-order advanced observer, thereby better adjusting the online work of the second-order advanced observer.
In order to achieve the above object, an embodiment of the present invention provides an online measurement device for a noise interference level of a second-order advanced observer and a method thereof, where the online measurement device includes:
the high-pass filter A is connected with the input end of the second-order advanced observer and used for acquiring an input signal of the second-order advanced observer to obtain a high-pass filtering signal A;
the high-pass filter B is connected with the output end of the second-order advanced observer and used for acquiring an output signal of the second-order advanced observer so as to obtain a high-pass filtering signal B;
the noise amplitude gain value calculation module is respectively connected with the output ends of the high-pass filter A and the high-pass filter B and is used for carrying out amplitude noise gain calculation according to the high-pass filtering signal A and the high-pass filtering signal B to obtain the noise amplitude gain value;
wherein the noise amplitude gain value calculation module comprises:
the average value A obtaining module is used for carrying out absolute value operation on the high-pass filtering signal A to obtain an absolute value A, and then carrying out average value operation on the absolute value A to obtain an average value A;
the average value B obtaining module is used for carrying out absolute value operation on the high-pass filtering signal B to obtain an absolute value B, and then carrying out average value operation on the absolute value B to obtain an average value B;
and the division operation module is used for dividing the average value A and the average value B to obtain a noise amplitude gain value.
Preferably, the input signal of the second-order lead observer comprises an overheat steam temperature process response signal of the thermal power generating unit.
Preferably, the noise disturbance level determination module is connected to the output end of the noise amplitude gain value calculation module, and is configured to determine the noise disturbance level of the second-order advance observer according to a preset threshold, determine that the noise disturbance level of the second-order advance observer is higher when the noise amplitude gain value is greater than or equal to the threshold, and determine that the noise disturbance level of the second-order advance observer is lower when the noise amplitude gain value is less than the threshold.
Preferably, the preset threshold is 3.16.
Preferably, the transfer function of the second order advance observer is:
SOLO(s)＝SOIIM(s)TOIF(s)
wherein, soiim(s) is a transfer function of the second-order inertial inverse model, and the formula is as follows:
wherein, TSOIIMIs the time constant of the second order inertial inverse model;
TOIF(s) is the transfer function of the third order inertial filter, and is given by:
wherein, TTOIFIs the time constant of the third order inertial filter.
Preferably, the structure and parameters of the high-pass filter a are the same as those of the high-pass filter B, and both the high-pass filter a and the high-pass filter B use a second-order high-pass filter.
The embodiment of the invention also provides an online measurement method of the noise interference level of the second-order advanced observer, which is applied to the online measurement device of the noise interference level of the second-order advanced observer in any embodiment, and the online measurement method comprises the following steps:
acquiring an input signal of the second-order advanced observer, and acquiring a high-pass filtering signal A through a high-pass filter A;
acquiring an output signal of the second-order advanced observer, and acquiring a high-pass filtering signal B through a high-pass filter B;
performing amplitude noise amplitude gain calculation according to the high-pass filtering signal A and the high-pass filtering signal B to obtain a noise amplitude gain value;
wherein the performing amplitude noise amplitude gain calculations according to the input signal of the second order advance observer and the output signal of the second order advance observer comprises:
carrying out absolute value operation on the high-pass filtering signal A to obtain an absolute value A, and carrying out average value operation on the absolute value A to obtain an average value A;
carrying out absolute value operation on the high-pass filtering signal B to obtain an absolute value B, and carrying out average value operation on the absolute value B to obtain an average value B;
and dividing the average value A and the average value B to obtain a noise amplitude gain value.
Preferably, the input signal of the second-order lead observer comprises an overheat steam temperature process response signal of the thermal power generating unit.
Preferably, the method further comprises the following steps:
and judging the noise interference level of the second-order advance observer according to a preset threshold, judging that the noise interference level of the second-order advance observer is higher when the noise amplitude gain value is greater than or equal to the threshold, and judging that the noise interference level of the second-order advance observer is lower when the noise amplitude gain value is smaller than the threshold, wherein the threshold is 3.16.
Preferably, the structure and parameters of the high-pass filter a are the same as those of the high-pass filter B, and both the high-pass filter a and the high-pass filter B use a second-order high-pass filter.
The embodiment of the invention also provides computer terminal equipment which comprises one or more processors and a memory. A memory coupled to the processor for storing one or more programs; when executed by the one or more processors, cause the one or more processors to implement a method for online measurement of a noise disturbance level of a second order lead observer as described in any of the embodiments above.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the online measurement method for the noise interference level of the second-order advanced observer according to any of the above embodiments.
In the online measurement device and method for the noise interference level of the second-order advance observer, a calculation result of a high-frequency noise amplitude gain of the second-order advance observer is obtained through a series of calculations of a high-frequency noise signal in an output signal of the second-order advance observer and a high-frequency noise signal in an input signal of the second-order advance observer. The online measurement result of the high-frequency noise amplitude gain of the second-order advanced observer can be continuously given, the high-frequency noise interference level of the second-order advanced observer is judged according to the online measurement result, the online measurement method has a good significance for guiding the online adjustment of the parameters of the second-order advanced observer, and no influence is caused on the online work of the second-order advanced observer.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an online measurement device for noise interference level of a second-order advanced observer according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a high-frequency noise amplitude gain calculation module according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of an online measurement device for noise interference level of a second-order advanced observer according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second-order advanced observer according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating the simulation results of the input signal of the second order lead observer according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating the results of a second order advanced observer output signal simulation according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating the results of an apparatus for online measurement of noise interference level of a second order lead observer according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a computer terminal device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides an online measurement apparatus for noise interference level of a second-order advanced observer, including:
the high-pass filter A is connected with the input end of the second-order advanced observer and used for acquiring an input signal of the second-order advanced observer to obtain a high-pass filtering signal A;
the high-pass filter B is connected with the output end of the second-order advanced observer and used for acquiring an output signal of the second-order advanced observer so as to obtain a high-pass filtering signal B;
the noise amplitude gain value calculation module is respectively connected with the output ends of the high-pass filter A and the high-pass filter B and is used for carrying out amplitude noise gain calculation according to the high-pass filtering signal A and the high-pass filtering signal B to obtain the noise amplitude gain value;
wherein the noise amplitude gain value calculation module comprises:
the average value A obtaining module is used for carrying out absolute value operation on the high-pass filtering signal A to obtain an absolute value A, and then carrying out average value operation on the absolute value A to obtain an average value A;
the average value B obtaining module is used for carrying out absolute value operation on the high-pass filtering signal B to obtain an absolute value B, and then carrying out average value operation on the absolute value B to obtain an average value B;
and the division operation module is used for dividing the average value A and the average value B to obtain a noise amplitude gain value.
In this embodiment, the second-order advanced observer is used for advanced observation of the response of the superheated steam temperature process of the thermal power generating unit. The device for measuring the noise interference level of the second-order advance observer on line comprises a High-pass filter A, a High-pass filter B and a noise amplitude gain value calculation module, wherein the output signal of the second-order advance observer is connected to the input end of the High-pass filter A, a High-pass filter signal A (HPFS: A) is obtained at the output end of the High-pass filter A, namely a High-frequency noise signal in the output signal of the second-order advance observer is obtained, and the High-pass filter signal A is expressed by the HPFS: A (t) in a dimensionless unit.
And (2) accessing the input signal of the second-order advance observer to the input end of the High-pass filter B, obtaining a High-pass filter signal B (HPFS: B) at the output end of the High-pass filter B, namely, obtaining a High-frequency noise signal in the input signal of the second-order advance observer, expressing the High-pass filter signal B by using the HPFS: B (t), wherein the unit is dimensionless, and the input signal of the second-order advance observer is specifically an overheated steam temperature process response signal of the thermal power generating unit.
And the high-pass filtering signal A is connected to an input signal A of a noise amplitude gain value calculation module, and the high-pass filtering signal B is connected to an input signal B of the noise amplitude gain value calculation module. And obtaining a calculation result of the high-frequency noise amplitude gain of the high-pass filtering signal A relative to the high-pass filtering signal B through the noise amplitude gain value calculation module, and outputting the calculation result of the high-frequency noise amplitude gain at the output end of the noise amplitude gain value calculation module.
Calculation of the high frequency noise amplitude gain, expressed as
OSAVO:A(t)＝|HPFS:A(t)|,
OSAVO:B(t)＝|HPFS:B(t)|,
Wherein, hfnag (t) is the calculation result of the high frequency noise amplitude gain, and the unit is dimensionless. MVO A(s) is the transfer function of Mean value operation A (MVO: A). OSAVO:A(t) is the Absolute value operation A (AVO: A) output signal process, and the unit is dimensionless. HPFS: a (t) is the high pass filtered signal a in dimensionless units. OSMVO:AAnd (t) is the average value operation signal A, and the unit is dimensionless. MVO B(s) is the transfer function of the Mean value operation B (MVO B). OSAVO:B(t) is the Absolute value operation of B (AVO: B) output signal process, the unit is dimensionless. HPFS B (t) is the high pass filtered signal B in dimensionless units. OSMVO:BAnd (t) is the average value operation signal B, and the unit is dimensionless. T isMTIs the time constant of the average operation in units of s.
Referring to fig. 2, the noise amplitude gain value calculating module includes:
1) the input signal A is connected to the input end of an absolute value operation A, and an absolute value operation signal OS is obtained at the output end of the absolute value operation AAVO:A(t) is expressed as
OSAVO:A(t)＝|HPFS:A(t)|
Wherein, OSAVO:A(t) is the absolute value operation signal A in dimensionless units. HPFS: a (t) is the high pass filtered signal a in dimensionless units.
2) The absolute value operation signal A is connected to the input end of the average value operation A, and the average value operation signal A is obtained at the output end of the average value operation A and is expressed as
Wherein the OSMVO:AAnd (t) is the average value operation signal A, and the unit is dimensionless.
3) The input signal B is connected to the input end of an absolute value operation B, and an absolute value operation signal OS is obtained at the output end of the absolute value operation BAVO:B(t) is expressed as
OSAVO:B(t)＝|HPFS:B(t)|
Wherein the OSAVO:BAnd (t) is the absolute value operation signal B, and the unit is dimensionless. HPFS B (t) is the high pass filtered signal B in dimensionless units.
4) The absolute value operation signal B is connected to the input end of the average value operation B, and the average value operation signal B is obtained at the output end of the average value operation B and is expressed as
Wherein, OSMVO:BAnd (t) is the average value operation signal B, and the unit is dimensionless.
5) The average value operation signal A is accessed to a dividend input end of Division Operation (DO), the average value operation signal B is accessed to a divisor input end of the Division operation, and the high-frequency noise amplitude gain calculation result is obtained at the output end of the Division operation and is expressed as
Wherein, hfnag (t) is the calculation result of the high frequency noise amplitude gain, and the unit is dimensionless. OSMVO:AAnd (t) is the average value operation signal A, and the unit is dimensionless. OSMVO:BAnd (t) is the average value operation signal B, and the unit is dimensionless.
The method is also suitable for all high-order advanced observers with the order greater than 2, such as a third-order advanced observer, a fourth-order advanced observer, a fifth-order advanced observer, a sixth-order advanced observer, a seventh-order observer, a high-order advanced observer and an eighth-order advanced observer.
In one embodiment, the input signal of the second-order lead observer comprises an overheat steam temperature process response signal of the thermal power generating unit.
In this embodiment, the input signal of the second-order lead observer is specifically an overheat steam temperature process response of the thermal power generating unit, and the noise signal included in the actual process response signal naturally includes a random quantization noise signal after the actual process response signal is converted from an analog quantity to a digital quantity, for example.
In one embodiment, the noise disturbance level determination module is connected to the output end of the noise amplitude gain value calculation module, and is configured to determine the noise disturbance level of the second-order advance observer according to a preset threshold, determine that the noise disturbance level of the second-order advance observer is higher when the noise amplitude gain value is greater than or equal to the threshold, and determine that the noise disturbance level of the second-order advance observer is lower when the noise amplitude gain value is less than the threshold.
Referring to fig. 3, in this embodiment, the present invention further includes a noise interference level determining module, configured to access the high-pass filtered signal a to an input a of the high-frequency noise amplitude gain calculation, access the high-pass filtered signal B to an input B of the high-frequency noise amplitude gain calculation, and obtain a calculation result of the high-frequency noise amplitude gain of the second-order lead observer at an output end of the high-frequency noise amplitude gain calculation. With HFNAGSOLO(t) expressing the calculation result of the high-frequency noise amplitude gain of the second-order advanced observer, wherein the unit is dimensionless. And finally, judging the high-frequency noise interference level of the second-order advance observer according to the calculation result of the high-frequency noise amplitude gain of the second-order advance observer. If the HFNAG isSOLOAnd (t) if the variation range of the second-order advanced observer is smaller than a preset threshold value, judging that the high-frequency noise interference level of the second-order advanced observer is lower. If the HFNAG is not presentSOLOAnd (t) if the variation range of the second-order advanced observer is larger than or equal to the threshold, judging that the high noise interference level of the second-order advanced observer is higher.
In a certain embodiment, the preset threshold is 3.16.
In this embodiment, the predetermined threshold is 3.16 if the HFNAG is setSOLO(t) variationAnd if the range is less than 3.16, judging that the high-frequency noise interference level of the second-order advance observer is lower. If the HFNAG isSOLOAnd (t) if the variation range of the second-order advanced observer is more than or equal to 3.16, judging that the high noise interference level of the second-order advanced observer is higher.
In one embodiment, the transfer function of the second order lead observer is:
SOLO(s)＝SOIIM(s)TOIF(s)
wherein, soiim(s) is a transfer function of the second-order inertial inverse model, and the formula is as follows:
wherein, TSOIIMIs the time constant of the second order inertial inverse model;
TOIF(s) is the transfer function of the third order inertial filter, and is given by:
wherein, TTOIFIs the time constant of the third order inertial filter.
In the present embodiment, the second order advanced observer structure is shown in fig. 4.
The second order advanced observer is expressed as
SOLO(s)＝SOIIM(s)TOIF(s),
SOIIM(s)＝(1+TSOIIMs)2,
Wherein SOLO(s) is a transfer function of the second order lead observer. SOIIM(s) is a transfer function of a Second Order Inertial Inverse Model (SOIIM). T isSOIIMIs the time constant of the second order inverse inertial model in s. TOIF(s) is a third order inertial filter (Three order inertial filter)ilter, TOIF). T isTOIFIs the time constant of the third order inertial filter, with the unit of s.
By ISSOLO(t) expressing the input signal of the second order advanced observer in dimensionless units, using OSSOLO(t) expressing the second order advanced observer output signal in dimensionless units.
In one embodiment, the structure and parameters of the high-pass filter a are the same as those of the high-pass filter B, and the high-pass filter a and the high-pass filter B both use a second-order high-pass filter.
In this embodiment, the High pass filter A (HPF: A) and the High pass filter B (HPF: B) are
Wherein, A(s) is the transfer function of the high-pass filter A, and B(s) is the transfer function of the high-pass filter B. THPF is the time constant common to the high pass filter a and the high pass filter B in s. The high-pass filter A and the high-pass filter B have the same structure and parameters, and both adopt a Second Order High Pass Filter (SOHPF) form.
The embodiment of the invention also provides an online measurement method of the noise interference level of the second-order advanced observer, which is applied to the online measurement device of the noise interference level of the second-order advanced observer in any embodiment, and the online measurement method comprises the following steps:
acquiring an input signal of the second-order advanced observer, and acquiring a high-pass filtering signal A through a high-pass filter A;
acquiring an output signal of the second-order advanced observer, and acquiring a high-pass filtering signal B through a high-pass filter B;
performing amplitude noise amplitude gain calculation according to the high-pass filtering signal A and the high-pass filtering signal B to obtain a noise amplitude gain value;
wherein the performing amplitude noise amplitude gain calculations according to the input signal of the second order advance observer and the output signal of the second order advance observer comprises:
carrying out absolute value operation on the high-pass filtering signal A to obtain an absolute value A, and carrying out average value operation on the absolute value A to obtain an average value A;
carrying out absolute value operation on the high-pass filtering signal B to obtain an absolute value B, and carrying out average value operation on the absolute value B to obtain an average value B;
and dividing the average value A and the average value B to obtain a noise amplitude gain value.
In this embodiment, the parameters of the second-order advance observer are: t is a unit ofSOIIM＝125s，TTOIF16 s. Setting a common time constant of the high-pass filter A and the high-pass filter B as follows: t isHPF30 s. Setting the parameters of the high-frequency noise amplitude gain calculation as follows: t isPL1000 s. And simulating a noise interference signal in an input signal of the second-order advanced observer by using a pseudo-random signal, wherein the output range of the pseudo-random signal is +/-0.01, and the unit is dimensionless.
The input signal of the second-order advance observer has a slope change, a slope change rate 1/1000s and a slope change time 1000s within a process time t of 3000 s-4000 s, and the purpose is to examine the influence of the change of the input signal of the second-order advance observer on the calculation result of the high-frequency noise amplitude gain of the second-order advance observer. By ISSOLO(t) expressing the input signal of the second order lead observer in dimensionless units. By OSSOLO(t) expressing the second order advanced observer output signal in dimensionless units.
The simulation experiment result of the input signal of the second-order advanced observer is obtained at a digital discrete calculation interval of 1s, and is shown in fig. 5. The result of the simulation experiment of the output signal of the second-order advanced observer is shown in fig. 6. And obtaining a comparison diagram of simulation experiment results of the high-frequency noise amplitude gain of the second-order advance observer, which is shown in fig. 7, wherein in the given process time t ranging from 0 to 8000s, the simulation experiment value of the high-frequency noise amplitude gain of the second-order advance observer changes in an interval of 6.5 to 6.9, and the interval change range is larger than 3.16, so that the high-frequency noise interference level of the second-order advance observer is judged to be higher. As can be seen from fig. 7, the slope change of the input signal of the second-order advance observer at the process time t of 3000s to 4000s has no significant effect on the calculation result of the high-frequency noise amplitude gain of the second-order advance observer.
In one embodiment, the input signal of the second-order lead observer comprises an overheat steam temperature process response signal of the thermal power generating unit.
In one embodiment, the method further comprises: and judging the noise interference level of the second-order advance observer according to a preset threshold, judging that the noise interference level of the second-order advance observer is higher when the noise amplitude gain value is greater than or equal to the threshold, and judging that the noise interference level of the second-order advance observer is lower when the noise amplitude gain value is smaller than the threshold, wherein the threshold is 3.16.
In one embodiment, the structure and parameters of the high-pass filter a are the same as those of the high-pass filter B, and the high-pass filter a and the high-pass filter B both use a second-order high-pass filter.
The embodiment of the invention provides an online measuring method of the noise interference level of a second-order advanced observer, which is applied to an online measuring device of the noise interference level of the second-order advanced observer in any one embodiment.
For the specific definition of the online measurement method of the noise interference level of the second-order lead observer, reference may be made to the above definition, which is not described herein again. The respective modules in the above-described online measurement device of the noise interference level of the second-order advance observer may be wholly or partially implemented by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
Referring to fig. 8, an embodiment of the invention provides a computer terminal device, which includes one or more processors and a memory. A memory is coupled to the processor for storing one or more programs, which when executed by the one or more processors, cause the one or more processors to implement a method for online measurement of a noise disturbance level of a second order lead observer as in any of the embodiments described above.
The processor is used for controlling the overall operation of the computer terminal equipment so as to complete all or part of the steps of the online measurement method of the noise interference level of the second-order advance observer. The memory is used to store various types of data to support the operation at the computer terminal device, which data may include, for example, instructions for any application or method operating on the computer terminal device, as well as application-related data. The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk.
In an exemplary embodiment, the computer terminal Device may be implemented by one or more Application Specific 1 integrated circuits (AS 1C), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor or other electronic components, and is configured to perform the above-mentioned online measurement method of the noise interference level of the second order look-ahead observer, and achieve the technical effects consistent with the above-mentioned methods.
In another exemplary embodiment, there is also provided a computer readable storage medium comprising program instructions which, when executed by a processor, implement the steps of the method for online measurement of noise disturbance level of a second order lead observer in any of the above embodiments. For example, the computer readable storage medium may be the above memory including program instructions executable by a processor of a computer terminal device to perform the above method for online measurement of noise interference level of a second order lead observer, and to achieve the technical effects consistent with the above method.
In the online measurement device and method for the noise interference level of the second-order advance observer, a calculation result of a high-frequency noise amplitude gain of the second-order advance observer is obtained through a series of calculations of a high-frequency noise signal in an output signal of the second-order advance observer and a high-frequency noise signal in an input signal of the second-order advance observer. The online measurement result of the high-frequency noise amplitude gain of the second-order advanced observer can be continuously given, the high-frequency noise interference level of the second-order advanced observer is judged according to the online measurement result, the online measurement method has a good significance for guiding the online adjustment of the parameters of the second-order advanced observer, and no influence is caused on the online work of the second-order advanced observer.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (7)
1. An on-line measurement device of a noise interference level of a second-order advanced observer, comprising:
the high-pass filter A is connected with the input end of the second-order advanced observer and used for acquiring an input signal of the second-order advanced observer to obtain a high-pass filtering signal A; the input signal of the second-order advanced observer comprises an overheat steam temperature process response signal of the thermal power generating unit;
the high-pass filter B is connected with the output end of the second-order advanced observer and used for acquiring an output signal of the second-order advanced observer so as to obtain a high-pass filtering signal B;
the noise amplitude gain value calculation module is respectively connected with the output ends of the high-pass filter A and the high-pass filter B and is used for carrying out amplitude noise gain calculation according to the high-pass filtering signal A and the high-pass filtering signal B to obtain the noise amplitude gain value;
wherein the noise amplitude gain value calculation module comprises:
the average value A obtaining module is used for carrying out absolute value operation on the high-pass filtering signal A to obtain an absolute value A, and then carrying out average value operation on the absolute value A to obtain an average value A;
the average value B obtaining module is used for carrying out absolute value operation on the high-pass filtering signal B to obtain an absolute value B, and then carrying out average value operation on the absolute value B to obtain an average value B;
the division operation module is used for carrying out division operation on the average value A and the average value B to obtain a noise amplitude gain value;
and the noise interference level judgment module is connected with the output end of the noise amplitude gain value calculation module and is used for judging the noise interference level of the second-order advanced observer according to a preset threshold value, when the noise amplitude gain value is greater than or equal to the threshold value, the noise interference level of the second-order advanced observer is judged to be higher, and when the noise amplitude gain value is less than the threshold value, the noise interference level of the second-order advanced observer is judged to be lower.
2. The on-line measurement device of the noise disturbance level of the second-order advanced observer according to claim 1, wherein the preset threshold value is 3.16.
3. The on-line measurement device of the noise interference level of the second order advance observer according to claim 1, wherein the transfer function of the second order advance observer is:
SOLO(s)＝SOIIM(s)TOIF(s)
wherein, soiim(s) is a transfer function of the second-order inertial inverse model, and the formula is as follows:
SOIIM(s)＝(1+TSOIIMs)2
wherein, TSOIIMThe time constant of the second-order inertia inverse model is shown, and s is a Laplace operator;
TOIF(s) is the transfer function of the third order inertial filter, and is given by:
wherein, TTOIFIs the time constant of the third order inertial filter.
4. The on-line measurement device of the noise interference level of the second-order advanced observer according to claim 1, wherein the structure and parameters of the high-pass filter a are the same as those of the high-pass filter B, and the high-pass filter a and the high-pass filter B both use a second-order high-pass filter.
5. An online measurement method of a noise interference level of a second-order advanced observer, the online measurement method comprising:
acquiring an input signal of the second-order advanced observer, and acquiring a high-pass filtering signal A through a high-pass filter A; the input signal of the second-order advanced observer comprises an overheated steam temperature process response signal of the thermal power generating unit;
acquiring an output signal of the second-order advanced observer, and acquiring a high-pass filtering signal B through a high-pass filter B;
performing amplitude noise amplitude gain calculation according to the high-pass filtering signal A and the high-pass filtering signal B to obtain a noise amplitude gain value;
wherein the performing amplitude noise amplitude gain calculations according to the input signal of the second order advance observer and the output signal of the second order advance observer comprises:
carrying out absolute value operation on the high-pass filtering signal A to obtain an absolute value A, and carrying out average value operation on the absolute value A to obtain an average value A;
carrying out absolute value operation on the high-pass filtering signal B to obtain an absolute value B, and carrying out average value operation on the absolute value B to obtain an average value B;
dividing the average value A and the average value B to obtain a noise amplitude gain value;
and judging the noise interference level of the second-order advance observer according to a preset threshold, judging that the noise interference level of the second-order advance observer is higher when the noise amplitude gain value is greater than or equal to the threshold, and judging that the noise interference level of the second-order advance observer is lower when the noise amplitude gain value is smaller than the threshold.
6. The method of online measurement of the noise disturbance level of a second order lead observer of claim 5, wherein the threshold value is 3.16.
7. The method for online measurement of the noise interference level of a second-order advanced observer according to claim 5, wherein the structure and parameters of the high-pass filter A are the same as those of the high-pass filter B, and the high-pass filter A and the high-pass filter B both use a second-order high-pass filter.
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