CN118034390A - Method and device for giving process of fastest control system - Google Patents
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Abstract
The invention discloses a method and a device for giving a process of a fastest control system, comprising the following steps: inputting a process given signal to a negative proportion arithmetic unit, and outputting a negative proportion arithmetic signal through the negative proportion arithmetic unit; the negative proportion operation signal is input to a first-order inertial filter through a delay signal output by a delay device, a first-order inertial filter signal is output, the first-order inertial filter signal is input to a third-order inertial filter, and a third-order inertial filter signal is output; respectively inputting the first-order inertia filtering signal and the third-order inertia filtering signal to a subtracter's subtrahend end and a subtrahend end, and outputting a subtraction signal; the process-given signal and the subtraction signal are input to an adder, and the process-given signal of the fastest control system is output through the adder. The invention can effectively inhibit process overshoot, further effectively improve the regulation performance of the acceleration type engineering fastest proportional-integral controller and promote the regulation performance of the fastest control system.
Description
Technical Field
The invention relates to the technical field of industrial process control, in particular to a process setting method and device of a fastest control system.
Background
In industrial process control practice, engineering researchers invented an engineering fastest controller (ENGINEERING FASTEST controllers, EFCs) to significantly improve feedback control performance. The category of EFC includes: an engineering fastest Proportional-Integral (ENGINEERING FASTEST pro-port-Integral, EFPI) controller, an accelerated engineering fastest Proportional-Integral (ACCELERATED ENGINEERING FASTEST pro-port-Integral, AEFPI) controller, and an engineering fastest look-ahead observer (ENGINEERING FASTEST LEADING observer, EFLO). EFPI is suitable for use in tandem with EFLO, and the magnitude of the improvement in relative Proportional-Integral-Derivative (PID) control performance is sufficient in high-order processes. AEFPI are suitable for use alone, and the magnitude of the improvement in relative Proportional-Integral-derivative (PI) control performance is sufficient.
In applications, it was found that the amount of process overshoot for AEFPI control is large in a first order hysteresis process or the like, which is an inherent feature of AEFPI control. Some systems do not allow for large process overshoots, and the existing method for setting a process in a fastest control system is usually to implement an effect of suppressing the process overshoots by connecting a First order inertial filter (INERTIAL FILTER, FOIF) to a process set end. However, existing fastest control system procedure given methods can significantly degrade the tuning performance of AEFPI controls.
Disclosure of Invention
The invention provides a method and a device for giving a process of a fastest control system, which are used for solving the technical problem that the conventional method for giving the process of the fastest control system can obviously reduce the adjustment performance of AEFPI control.
The invention provides a method for giving a process of a fastest control system, which comprises the following steps:
Inputting a process given signal to a negative proportion arithmetic unit, and outputting a negative proportion arithmetic signal through the negative proportion arithmetic unit;
inputting the negative proportion operation to a delayer, and outputting a delay signal through the delayer;
inputting the delay signal to a first-order inertial filter, and outputting a first-order inertial filter signal through the first-order inertial filter;
inputting the first-order inertial filtering signal to a third-order inertial filter, and outputting the third-order inertial filtering signal through the third-order inertial filter;
The first-order inertial filtering signal is input to the subtracter's subtracter, inputting the third-order inertia filtering signal to a subtracter end, and outputting a subtraction signal through the subtracter;
The process given signal and the subtraction signal are input to an adder, and the process given signal of the fastest control system is output through the adder.
Further, the process given signal is a process given signal of a superheated steam temperature control system of the thermal power generating unit.
Further, the negative ratio operator includes:
fPO(s)＝-KPO,
0≥-KPO≥-1
Wherein f PO(s) is the Laplacian transfer function of the negative proportion arithmetic unit, -K PO is the proportion gain of the negative proportion arithmetic unit, and the range of-K PO is smaller than or equal to 0 and larger than or equal to-1.
Further, the delayer includes:
fLO(s)＝e-τs
Wherein f LO(s) is the Laplacian transfer function of the delayer, and τ is the delay constant of the delayer.
Further, the first-order inertial filter includes:
Where f FOIF(s) is the laplace transfer function of the first-order inertial filter, and T FOIF is the time constant of the first-order inertial filter.
Further, the third-order inertial filter includes:
Wherein f TOIF(s) is the laplace transfer function of the third-order inertial filter, and T TOIF is the time constant of the third-order inertial filter.
Further, the fastest control system procedure set includes:
Wherein f FCSPG(s) is a laplace transfer function given by a fastest control system process, f PO(s) is a laplace transfer function of the negative proportional operator, -K PO is a proportional gain of the negative proportional operator, f LO(s) is a laplace transfer function of the delayer, τ is a delay constant of the delayer, f FOIF(s) is a laplace transfer function of the first-order inertial filter, T FOIF is a time constant of the first-order inertial filter, f TOIF(s) is a laplace transfer function of the third-order inertial filter, and T TOIF is a time constant of the third-order inertial filter.
The present invention also provides a fastest control system process given apparatus, comprising:
The negative proportion operation signal output module is used for inputting the process given signal to the negative proportion operator and outputting a negative proportion operation signal through the negative proportion operator;
the delay signal output module is used for inputting the negative proportion operation to the delayer and outputting a delay signal through the delayer;
the first-order inertia filter signal output module is used for inputting the delay signal to the first-order inertia filter and outputting a first-order inertia filter signal through the first-order inertia filter;
the third-order inertial filter module output module is used for inputting the first-order inertial filter signal to a third-order inertial filter and outputting a third-order inertial filter signal through the third-order inertial filter;
The subtracting signal output module is used for inputting the first-order inertia filtering signal to the subtracter and outputting a subtracting signal through the subtracter;
And the process given signal output module is used for inputting the process given signal and the subtraction signal to an adder, and outputting the process given signal of the fastest control system through the adder.
Further, the process given signal is a process given signal of a superheated steam temperature control system of the thermal power generating unit.
Further, the negative ratio operator includes:
fPO(s)＝-KPO,
0≥-KPO≥-1
Wherein f PO(s) is the Laplacian transfer function of the negative proportion arithmetic unit, -K PO is the proportion gain of the negative proportion arithmetic unit, and the range of-K PO is smaller than or equal to 0 and larger than or equal to-1.
Further, the delayer includes:
fLO(s)＝e-τs
Wherein f LO(s) is the Laplacian transfer function of the delayer, and τ is the delay constant of the delayer.
The process given signal in the embodiment of the invention is a process given signal of a superheated steam temperature control system of a thermal power generating unit, the process given signal can be used as an input of the control system and used for guiding the control system to adjust an actuator so that the output of the system gradually approaches an expected value, the process given signal is input to a negative proportion arithmetic unit, the negative proportion arithmetic unit outputs the negative proportion arithmetic signal, the negative proportion arithmetic signal is input to a delay unit and an inertial filter for corresponding processing to obtain a subtraction signal, and the process given signal is added with the subtraction signal through an adder to obtain a process given signal of a fastest control system, so that the process overshoot can be effectively restrained, the adjustment performance of an acceleration engineering fastest proportional-integral controller can be effectively improved, and the adjustment performance of the fastest control system is improved.
Drawings
FIG. 1 is a schematic flow chart of a method for providing a process set-up of a fastest control system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a process-given processor of a fastest control system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a fastest control system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a process output without the method according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a process output using the method according to an embodiment of the present invention;
Fig. 6 is a schematic structural diagram of a given device for a process of a fastest control system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, the present invention provides a method for setting a process of a fastest control system, including:
S1, inputting a process given signal to a negative proportion arithmetic unit, and outputting a negative proportion arithmetic signal through the negative proportion arithmetic unit;
In the embodiment of the invention, the negative proportion arithmetic unit can generate an output signal in inverse proportion relation with the error signal, so that the feedback of the system can be negatively regulated, namely, when the error signal is increased, the output signal of the negative proportion arithmetic unit can be reduced, thereby inhibiting the overshoot and oscillation of the system and improving the stability and response speed of the system.
In an embodiment of the invention, in a superheated steam temperature control system of a thermal power plant, a process-given signal is used to indicate a desired output value, i.e. a desired temperature of the superheated steam, required. This process-given signal may be used as an input to the control system to direct the control system to adjust the actuator such that the output of the system gradually approaches the desired value.
In the embodiment of the invention, the process given signal is a process given signal of the superheated steam temperature control system of the thermal power unit, and the process given signal can indicate the target temperature required by the superheated steam temperature control system of the thermal power unit.
S2, inputting the negative proportion operation to a delayer, and outputting a delay signal through the delayer;
in an embodiment of the invention, a delay is used to delay the delivery of the input signal so as to introduce a time delay in the control system when required. Such delays may be used to simulate the propagation delay in an actual system or introduce some phase lag into the system to achieve a more accurate time response in the control system.
S3, inputting the delay signal into a first-order inertial filter, and outputting a first-order inertial filter signal through the first-order inertial filter;
S4, inputting the first-order inertial filtering signal into a third-order inertial filter, and outputting the third-order inertial filtering signal through the third-order inertial filter;
In the embodiment of the invention, the inertia filter outputs the inertia filter signal, so that the first addition signal can be subjected to smoothing treatment to reduce high-frequency noise in the signal, and meanwhile, the low-frequency component in the signal is reserved, thereby being beneficial to improving the stability and the anti-interference capability of the control system.
S5, inputting the first-order inertia filtering signal to a subtracter subtrahend end, inputting the third-order inertia filtering signal to the subtrahend end of the subtracter, and outputting a subtraction signal through the subtracter;
In an embodiment of the invention, a subtractor may calculate a difference between the input signals and may be used to compare the difference between the desired output and the actual output of the system, thereby generating an error signal. This error signal may be used as an input to the control system for adjusting the output of the system to approach a desired value.
Specifically, in the embodiment of the invention, the difference between the first-order inertia filtering signal and the third-order inertia filtering signal can be obtained through the subtracter, so as to obtain a subtraction signal.
S6, inputting the process given signal and the subtraction signal to an adder, and outputting the process given signal of the fastest control system through the adder.
In an embodiment of the invention, the adder is configured to add a plurality of input signals, for example, to add a process-given signal to the subtracted signal, to generate a synthesized output signal, i.e., the process-given signal of the fastest control system.
The process given signal in the embodiment of the invention is a process given signal of a superheated steam temperature control system of a thermal power generating unit, the process given signal can be used as an input of the control system and used for guiding the control system to adjust an actuator so that the output of the system gradually approaches an expected value, the process given signal is input to a negative proportion arithmetic unit, the negative proportion arithmetic unit outputs the negative proportion arithmetic signal, the negative proportion arithmetic signal is input to a delay unit and an inertial filter for corresponding processing to obtain a subtraction signal, and the process given signal is added with the subtraction signal through an adder to obtain a process given signal of a fastest control system, so that the process overshoot can be effectively restrained, the adjustment performance of an acceleration engineering fastest proportional-integral controller can be effectively improved, and the adjustment performance of the fastest control system is improved.
In one embodiment, the process-given signal is a process-given signal of a superheated steam temperature control system of a thermal power plant.
In one embodiment, the negative ratio operator includes:
fPO(s)＝-KPO,
0≥-KPO≥-1
Wherein f PO(s) is the Laplacian transfer function of the negative proportion arithmetic unit, -K PO is the proportion gain of the negative proportion arithmetic unit, and the range of-K PO is smaller than or equal to 0 and larger than or equal to-1.
In one embodiment, the delay comprises:
fLO(s)＝e-τs
Wherein f LO(s) is the Laplacian transfer function of the delayer, and τ is the delay constant of the delayer.
In one embodiment, the first order inertial filter includes:
Where f FOIF(s) is the laplace transfer function of the first-order inertial filter, and T FOIF is the time constant of the first-order inertial filter.
In one embodiment, the third order inertial filter includes:
Wherein f TOIF(s) is the laplace transfer function of the third-order inertial filter, and T TOIF is the time constant of the third-order inertial filter.
In one embodiment, the fastest control system procedure set includes:
Wherein f FCSPG(s) is a laplace transfer function given by a fastest control system process, f PO(s) is a laplace transfer function of the negative proportional operator, -K PO is a proportional gain of the negative proportional operator, f LO(s) is a laplace transfer function of the delayer, τ is a delay constant of the delayer, f FOIF(s) is a laplace transfer function of the first-order inertial filter, T FOIF is a time constant of the first-order inertial filter, f TOIF(s) is a laplace transfer function of the third-order inertial filter, and T TOIF is a time constant of the third-order inertial filter.
Referring to fig. 2, in one embodiment, a process-given processor of the fastest control system includes a negative-scale operator, a delay, a first-order inertial filter, a third-order inertial filter, a subtractor, and an adder;
The input end of the process given signal is respectively connected with the input end of the negative proportion arithmetic unit and the first input end of the adder;
The output end of the negative proportion arithmetic unit is connected with the input end of the first-order inertial filter through the delay device;
The output end of the first-order inertial filter is connected with the reduced end of the adder and the input end of the third-order inertial filter respectively;
the output end of the third-order inertial filter is connected with the number reduction end of the subtracter, and the output end of the subtracter is connected with the second input end of the adder.
In the embodiment of the invention, the process given processor receives the original process given signal and performs corresponding processing to obtain the process given signal of the fastest control system, and the process given signal can be output to a corresponding controller, for example, can be output to a subtracter, and is further output to AEFPI through the subtracter.
Referring to fig. 3, in one embodiment, the fastest control system includes: a process-given processor, a subtractor, an accelerated engineering maximum speed proportional-integral controller (AEFPI), and a process processor. The input end of the process given signal is connected with the input end of the process given processor, the output end of the process given processor is connected with the decremented end of the subtracter, the output end of the subtracter is connected with the input end of the process processor through AEFPI, and the output end of the process processor is connected with the decremented end of the subtracter to form closed loop feedback.
In an embodiment of the present invention, AEFPI includes:
fAEFPI(s)＝KAEFPI[1+fAEFI(s)],
TAEFI＝TAEFTF
Where f AEFPI(s) is the transfer function of AEFPI, K AEFPI Is that is the cascade proportional control gain, f AEFI(s) is the transfer function of the Acceleration engineering slowest integrator (accel-tion ENGINEERING FASTEST integrator, AEFI), and f AEFTF(s) is the transfer function of the Acceleration engineering slowest tracking filter (accel-tion ENGINEERING FASTEST TRACKING FILTER, AEFTF); t AEFI is the time constant of AEFI in s; t AEFTF is the time constant of AEFTF in s; quantitatively T AEFI＝TAEFTF.
In one embodiment, a process processor includes:
where f P(s) is the transfer function of the process.
In one embodiment, the open loop system gain is equal to 0.5 when the open loop system phase is equal to-135 °, and AEFPI parameters are obtained by searching for the optimal parameters of AEFPI: t AEFI＝413s,KAEFPI = 2.187.
Referring to fig. 4, before the process setting method of the fastest control system provided by the embodiment of the present invention is not adopted, when the process setting signal is a unit step signal, a simulation result is obtained. As can be seen by referring to fig. 4, the process overshoot is 19%, the adjustment time is 861s, and the adjustment time is the time that the process enters less than 5% deviation.
Referring to fig. 5, the parameters related to a method for setting a process of a fastest control system according to an embodiment of the present invention are as follows: -K PO＝-0.3,τ＝205s,TFOIF is =80 s, t TOIF = 120s, and simulation based on the above parameters results in a simulation diagram as shown in fig. 5.
With continued reference to FIG. 5, the process overshoot was found to be 0.8% and the adjustment time was found to be 275s.
From fig. 4 and 5, it can be appreciated that a fastest control system process given method provided by embodiments of the present invention can not only significantly reduce process overshoot, but also significantly reduce adjustment time.
The embodiment of the invention has the following beneficial effects:
The process given signal in the embodiment of the invention is a process given signal of a superheated steam temperature control system of a thermal power generating unit, the process given signal can be used as an input of the control system and used for guiding the control system to adjust an actuator so that the output of the system gradually approaches an expected value, the process given signal is input to a negative proportion arithmetic unit, the negative proportion arithmetic unit outputs the negative proportion arithmetic signal, the negative proportion arithmetic signal is input to a delay unit and an inertial filter for corresponding processing to obtain a subtraction signal, and the process given signal is added with the subtraction signal through an adder to obtain a process given signal of a fastest control system, so that the process overshoot can be effectively restrained, the adjustment performance of an acceleration engineering fastest proportional-integral controller can be effectively improved, and the adjustment performance of the fastest control system is improved.
Referring to fig. 6, based on the same inventive concept as the above embodiment, the present invention also provides a process setting apparatus of a fastest control system, which includes:
The negative proportion operation signal output module 10 is used for inputting the process given signal to a negative proportion operator and outputting a negative proportion operation signal through the negative proportion operator;
In the embodiment of the invention, the negative proportion arithmetic unit can generate an output signal in inverse proportion relation with the error signal, so that the feedback of the system can be negatively regulated, namely, when the error signal is increased, the output signal of the negative proportion arithmetic unit can be reduced, thereby inhibiting the overshoot and oscillation of the system and improving the stability and response speed of the system.
In an embodiment of the invention, in a superheated steam temperature control system of a thermal power plant, a process-given signal is used to indicate a desired output value, i.e. a desired temperature of the superheated steam, required. This process-given signal may be used as an input to the control system to direct the control system to adjust the actuator such that the output of the system gradually approaches the desired value.
In the embodiment of the invention, the process given signal is a process given signal of the superheated steam temperature control system of the thermal power unit, and the process given signal can indicate the target temperature required by the superheated steam temperature control system of the thermal power unit.
The delay signal output module 20 is configured to input the negative proportion operation to a delayer, and output a delay signal through the delayer;
in an embodiment of the invention, a delay is used to delay the delivery of the input signal so as to introduce a time delay in the control system when required. Such delays may be used to simulate the propagation delay in an actual system or introduce some phase lag into the system to achieve a more accurate time response in the control system.
A first-order inertial filter signal output module 30, configured to input the delay signal to a first-order inertial filter, and output a first-order inertial filter signal through the first-order inertial filter;
the third-order inertial filter module output module 40 is configured to input the first-order inertial filter signal to a third-order inertial filter, and output a third-order inertial filter signal through the third-order inertial filter;
In the embodiment of the invention, the inertia filter outputs the inertia filter signal, so that the first addition signal can be subjected to smoothing treatment to reduce high-frequency noise in the signal, and meanwhile, the low-frequency component in the signal is reserved, thereby being beneficial to improving the stability and the anti-interference capability of the control system.
A subtraction signal output module 50 for inputting the first-order inertia filter signal to a subtracted end of the subtracter, inputting the third-order inertia filtering signal to a subtracter end, and outputting a subtraction signal through the subtracter;
In an embodiment of the invention, a subtractor may calculate a difference between the input signals and may be used to compare the difference between the desired output and the actual output of the system, thereby generating an error signal. This error signal may be used as an input to the control system for adjusting the output of the system to approach a desired value.
Specifically, in the embodiment of the invention, the difference between the first-order inertia filtering signal and the third-order inertia filtering signal can be obtained through the subtracter, so as to obtain a subtraction signal.
A process-given signal output module 60 for inputting the process-given signal and the subtraction signal to an adder, and outputting the process-given signal of the fastest control system through the adder.
In an embodiment of the invention, the adder is configured to add a plurality of input signals, for example, to add a process-given signal to the subtracted signal, to generate a synthesized output signal, i.e., the process-given signal of the fastest control system.
The process given signal in the embodiment of the invention is a process given signal of a superheated steam temperature control system of a thermal power generating unit, the process given signal can be used as an input of the control system to guide the control system to adjust an actuator so that the output of the system gradually approaches an expected value, the process given signal is input to a negative proportion arithmetic unit, the negative proportion arithmetic unit outputs the negative proportion arithmetic signal, the negative proportion arithmetic signal is input to a delay unit and an inertial filter to be correspondingly processed to obtain a subtraction signal, and the process given signal is added with the subtraction signal through an adder to obtain a process given signal of a fastest control system, so that the problem of overlong adjusting time caused by signal delay can be effectively avoided, the quick response of the system can be realized, the occurrence of overshoot phenomenon can be effectively restrained, and the adjusting performance of an acceleration engineering fastest proportion-integration controller can be effectively improved.
In one embodiment, the process-given signal is a process-given signal of a superheated steam temperature control system of a thermal power plant.
In one embodiment, the negative ratio operator includes:
fPO(s)＝-KPO,
0≥-KPO≥-1
Wherein f PO(s) is the Laplacian transfer function of the negative proportion arithmetic unit, -K PO is the proportion gain of the negative proportion arithmetic unit, and the range of-K PO is smaller than or equal to 0 and larger than or equal to-1.
In one embodiment, the delay comprises:
fLO(s)＝e-τs
Wherein f LO(s) is the Laplacian transfer function of the delayer, and τ is the delay constant of the delayer.
In one embodiment, the first order inertial filter includes:
Where f FOIF(s) is the laplace transfer function of the first-order inertial filter, and T FOIF is the time constant of the first-order inertial filter.
In one embodiment, the third order inertial filter includes:
Wherein f TOIF(s) is the laplace transfer function of the third-order inertial filter, and T TOIF is the time constant of the third-order inertial filter.
In one embodiment, the fastest control system procedure set includes:
Wherein f FCSPG(s) is a laplace transfer function given by a fastest control system process, f PO(s) is a laplace transfer function of the negative proportional operator, -K PO is a proportional gain of the negative proportional operator, f LO(s) is a laplace transfer function of the delayer, τ is a delay constant of the delayer, f FOIF(s) is a laplace transfer function of the first-order inertial filter, T FOIF is a time constant of the first-order inertial filter, f TOIF(s) is a laplace transfer function of the third-order inertial filter, and T TOIF is a time constant of the third-order inertial filter.
Referring to fig. 2, in one embodiment, a process-given processor of the fastest control system includes a negative-scale operator, a delay, a first-order inertial filter, a third-order inertial filter, a subtractor, and an adder;
The input end of the process given signal is respectively connected with the input end of the negative proportion arithmetic unit and the first input end of the adder;
The output end of the negative proportion arithmetic unit is connected with the input end of the first-order inertial filter through the delay device;
The output end of the first-order inertial filter is connected with the reduced end of the adder and the input end of the third-order inertial filter respectively;
the output end of the third-order inertial filter is connected with the number reduction end of the subtracter, and the output end of the subtracter is connected with the second input end of the adder.
In the embodiment of the invention, the process given processor receives the original process given signal and performs corresponding processing to obtain the process given signal of the fastest control system, and the process given signal can be output to a corresponding controller, for example, can be output to a subtracter, and is further output to AEFPI through the subtracter.
Referring to fig. 3, in one embodiment, the fastest control system includes: a process-given processor, a subtractor, an accelerated engineering maximum speed proportional-integral controller (AEFPI), and a process processor. The input end of the process given signal is connected with the input end of the process given processor, the output end of the process given processor is connected with the reduced number end of the subtracter, the output end of the subtracter is connected with the input end of the process processor through AEFPI, and the output end of the process processor is respectively connected with the output ends before other control and the reduced number end of the subtracter.
In an embodiment of the present invention, AEFPI includes:
fAEFPI(s)＝KAEFPI[1+fAEFI(s)],
TAEFI＝TAEFTF
Where f AEFPI(s) is the transfer function of AEFPI, K AEFPI Is that is the cascade proportional control gain, f AEFI(s) is the transfer function of the Acceleration engineering slowest integrator (accel-tion ENGINEERING FASTEST integrator, AEFI), and f AEFTF(s) is the transfer function of the Acceleration engineering slowest tracking filter (accel-tion ENGINEERING FASTEST TRACKING FILTER, AEFTF); t AEFI is the time constant of AEFI in s; t AEFTF is the time constant of AEFTF in s; quantitatively T AEFI＝TAEFTF.
In one embodiment, a process processor includes:
where f P(s) is the transfer function of the process.
In one embodiment, the open loop system gain is equal to 0.5 when the open loop system phase is equal to-135 °, and AEFPI parameters are obtained by searching for the optimal parameters of AEFPI: t AEFI＝413s,KAEFPI = 2.187.
Referring to fig. 4, before the process setting method of the fastest control system provided by the embodiment of the present invention is not adopted, when the process setting signal is a unit step signal, a simulation result is obtained. As can be seen by referring to fig. 4, the process overshoot is 19%, the adjustment time is 861s, and the adjustment time is the time that the process enters less than 5% deviation.
Referring to fig. 5, the parameters related to a method for setting a process of a fastest control system according to an embodiment of the present invention are as follows: -K PO＝-0.3,τ＝205s,TFOIF is =80 s, t TOIF = 120s, and simulation based on the above parameters results in a simulation diagram as shown in fig. 5.
With continued reference to FIG. 5, the process overshoot was found to be 0.8% and the adjustment time was found to be 275s.
From fig. 4 and 5, it can be appreciated that a fastest control system process given method provided by embodiments of the present invention can not only significantly reduce process overshoot, but also significantly reduce adjustment time.
The embodiment of the invention has the following beneficial effects:
The process given signal in the embodiment of the invention is a process given signal of a superheated steam temperature control system of a thermal power generating unit, the process given signal can be used as an input of the control system and used for guiding the control system to adjust an actuator so that the output of the system gradually approaches an expected value, the process given signal is input to a negative proportion arithmetic unit, the negative proportion arithmetic unit outputs the negative proportion arithmetic signal, the negative proportion arithmetic signal is input to a delay unit and an inertial filter for corresponding processing to obtain a subtraction signal, and the process given signal is added with the subtraction signal through an adder to obtain a process given signal of a fastest control system, so that the process overshoot can be effectively restrained, the adjustment performance of an acceleration engineering fastest proportional-integral controller can be effectively improved, and the adjustment performance of the fastest control system is improved.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (10)
1. A method for providing a fastest control system process, comprising:
Inputting a process given signal to a negative proportion arithmetic unit, and outputting a negative proportion arithmetic signal through the negative proportion arithmetic unit;
inputting the negative proportion operation to a delayer, and outputting a delay signal through the delayer;
inputting the delay signal to a first-order inertial filter, and outputting a first-order inertial filter signal through the first-order inertial filter;
inputting the first-order inertial filtering signal to a third-order inertial filter, and outputting the third-order inertial filtering signal through the third-order inertial filter;
The first-order inertial filtering signal is input to the subtracter's subtracter, inputting the third-order inertia filtering signal to a subtracter end, and outputting a subtraction signal through the subtracter;
The process given signal and the subtraction signal are input to an adder, and the process given signal of the fastest control system is output through the adder.
2. The fastest control system process set-up method of claim 1, wherein said process set-up signal is a process set-up signal of a thermal power plant superheated steam temperature control system.
3. The fastest control system process given method of claim 1, wherein said negative proportional operator comprises:
fPO(s)＝-KPO,
0≥-KPO≥-1
Wherein f PO(s) is the Laplacian transfer function of the negative proportion arithmetic unit, -K PO is the proportion gain of the negative proportion arithmetic unit, and the range of-K PO is smaller than or equal to 0 and larger than or equal to-1.
4. The fastest control system process given method of claim 1, wherein said delay means comprises:
fLO(s)＝e-τs
Wherein f LO(s) is the Laplacian transfer function of the delayer, and τ is the delay constant of the delayer.
5. The fastest control system process given method of claim 1, wherein said first order inertial filter comprises:
Where f FOIF(s) is the laplace transfer function of the first-order inertial filter, and T FOIF is the time constant of the first-order inertial filter.
6. The fastest control system process given method of claim 1, wherein said third order inertial filter comprises:
Wherein f TOIF(s) is the laplace transfer function of the third-order inertial filter, and T TOIF is the time constant of the third-order inertial filter.
7. The fastest control system process given method of claim 1, wherein said fastest control system process given comprises:
Wherein f FCSPG(s) is a laplace transfer function given by a fastest control system process, f PO(s) is a laplace transfer function of the negative proportional operator, -K PO is a proportional gain of the negative proportional operator, f LO(s) is a laplace transfer function of the delayer, τ is a delay constant of the delayer, f FOIF(s) is a laplace transfer function of the first-order inertial filter, T FOIF is a time constant of the first-order inertial filter, f TOIF(s) is a laplace transfer function of the third-order inertial filter, and T TOIF is a time constant of the third-order inertial filter.
8. A fastest control system process given apparatus, comprising:
The negative proportion operation signal output module is used for inputting the process given signal to the negative proportion operator and outputting a negative proportion operation signal through the negative proportion operator;
the delay signal output module is used for inputting the negative proportion operation to the delayer and outputting a delay signal through the delayer;
the first-order inertia filter signal output module is used for inputting the delay signal to the first-order inertia filter and outputting a first-order inertia filter signal through the first-order inertia filter;
the third-order inertial filter module output module is used for inputting the first-order inertial filter signal to a third-order inertial filter and outputting a third-order inertial filter signal through the third-order inertial filter;
The subtracting signal output module is used for inputting the first-order inertia filtering signal to the subtracter and outputting a subtracting signal through the subtracter;
And the process given signal output module is used for inputting the process given signal and the subtraction signal to an adder, and outputting the process given signal of the fastest control system through the adder.
9. The fastest control system process given device of claim 8, wherein said negative proportional operator includes:
fPO(s)＝-KPO,
0≥-KPO≥-1
Wherein f PO(s) is the Laplacian transfer function of the negative proportion arithmetic unit, -K PO is the proportion gain of the negative proportion arithmetic unit, and the range of-K PO is smaller than or equal to 0 and larger than or equal to-1.
10. The fastest control system process given device of claim 8, wherein said delay means comprises:
fLO(s)＝e-τs
Wherein f LO(s) is the Laplacian transfer function of the delayer, and τ is the delay constant of the delayer.
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