CN108594676B - Method for quickly identifying characteristic parameters of industrial controlled process - Google Patents
Method for quickly identifying characteristic parameters of industrial controlled process Download PDFInfo
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- CN108594676B CN108594676B CN201810296113.9A CN201810296113A CN108594676B CN 108594676 B CN108594676 B CN 108594676B CN 201810296113 A CN201810296113 A CN 201810296113A CN 108594676 B CN108594676 B CN 108594676B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
Abstract
The invention discloses a kind of industrial controlled process characteristic parameterThe fast number identification method comprises the following steps: describing the dynamic characteristics of the industrial controlled process by adopting three characteristic parameters of open-loop gain K, time constant T and delay time L; step 2: applying a step signal with constant amplitude to an industrial controlled process to obtain a sampling information output value y (t) of a step response; and step 3: respectively calculating the obtained y (t) and y2(t) and y3(t) corresponding accumulated value A1、A2And A3(ii) a And 4, step 4: according to the sampling information output value y (t) obtained in the step 2 and the accumulated value A obtained by calculation in the step 31、A2、A3The running time t and the sampling period delta t, and three characteristic parameters of the industrial controlled process are calculated. According to the method, only step signals need to be applied to the industrial controlled process, so that the industrial controlled process can stably run in the system modeling process, and the required data is collected when the industrial controlled process stably runs; the algorithm of the three characteristic parameters is simple, the calculated amount is small, and the requirement on the calculation capability of the industrial controller is not high.
Description
Technical Field
The invention relates to a method for quickly identifying characteristic parameters of an industrial controlled process, belonging to the field of system modeling.
Background
The design of industrial control systems relies on mathematical models of the process being controlled. The dynamics of most industrial processes can be approximated by a first-order time-lag model.
However, the commonly used system modeling methods require that the applied input signal must satisfy the "continuous excitation" condition; to get enough data, the system must run for a long time; in addition, the calculated amount of the parameters is large, and great inconvenience is brought to engineering application. If the requirements on continuous excitation of input signals can be reduced, the calculation method of parameters can be simplified, and the system running time can be shortened, great convenience is brought to engineering application.
Disclosure of Invention
The invention provides a method for quickly identifying characteristic parameters of an industrial controlled process, which can quickly acquire the characteristic parameters of the industrial controlled process based on step response of the industrial controlled process.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for quickly identifying characteristic parameters of an industrial controlled process comprises the following steps:
step 1: describing the dynamic characteristics of a common industrial controlled process by adopting three characteristic parameters of open-loop gain K, a time constant T and delay time L;
step 2: applying a step signal with constant amplitude to the industrial controlled process, recording as r (t), and acquiring an output value of the industrial controlled process by a sampling period delta t, recording as y (t), wherein t is running time and has a unit of second;
and step 3: calculating the power y of y (t)2The third power y of (t) and y (t)3(t) and calculating the obtained y (t) and y2(t) and y3(t) corresponding accumulated values a1, a2, and A3;
and 4, step 4: according to the output value y (t) obtained in the step 2 and the accumulated value A obtained by calculation in the step 31、A2、A3The method comprises the steps of calculating three characteristic parameters of the industrial controlled process, namely open loop gain K, a time constant T and delay time L, wherein the unit of the time constant T and the unit of the delay time L are seconds.
Preferably, the industrially controlled process is described using formula (1):
in formula (1), K is an open-loop gain, T is a time constant, L is a delay time, r (T) is an input signal of the industrial controlled process, y (T) is an output value of the industrial controlled process, and T is a running time;
recording the step signal with the applied amplitude value R of the industrial process as R (t) ═ R, collecting the output value y (t) of the industrial controlled process by the sampling period delta t, and calculating y (t), y (t) and y according to the formula (2)2(t) and y3(t) respective corresponding accumulated values A1、A2And A3Wherein formula (2) is as follows:
preferably, when the output of the industrial controlled process reaches a steady state under the action of the step signal with the amplitude of R, the open loop gain K, the time constant T and the delay time L are calculated by the formula (3):
has the advantages that: compared with the prior art, the invention provides a method for quickly identifying characteristic parameters of an industrial controlled process, only step signals need to be applied to the industrial process, so that the industrial process can stably run in the system modeling process, and required data is collected when the industrial process runs stably; the algorithm of the three characteristic parameters is simple, the calculated amount is small, and the requirement on the calculation capability of the industrial controller is not high.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
A method for quickly identifying characteristic parameters of an industrial controlled process comprises the following steps:
step 1: the dynamic characteristic of the industrial controlled process is described by three characteristic parameters of open-loop gain K, time constant T and delay time L, as shown in formula (1):
in formula (1), K is an open-loop gain, T is a time constant, L is a delay time, r (T) is an input signal of the industrial controlled process, y (T) is an output value of the industrial controlled process, and T is a running time;
step 2: and (3) enabling the controlled industrial process to be in a zero initial state, applying a step signal with a constant amplitude value R at the control signal input end of the industrial controlled process, wherein R (t) is R, and the amplitude value R is preferably the steady-state working amplitude value of the industrial controlled process. Acquiring an output response y (t) of the industrial controlled process with a sampling period delta t during the operation of the industrial controlled process;
and step 3: calculating y (t), y according to equation (2)2(t) and y3(t) respective corresponding accumulated values A1、A2And A3Wherein formula (2) is as follows:
and 4, step 4: when the output reaches a steady state (i.e. the size of y (t) is not changed) under the action of the step signal r (t) in the industrial controlled process, the accumulated value A calculated in the step 3 is obtained according to the sampling information y (t) obtained in the step 21、A2、A3Calculating three characteristic parameters of the industrial controlled process by combining the formula (3), wherein the three characteristic parameters comprise open-loop gain K, a time constant T and delay time L, and the formula (3) is as follows:
the previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Two modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. A method for quickly identifying characteristic parameters of an industrial controlled process is characterized by comprising the following steps: the method comprises the following steps:
step 1: describing the dynamic characteristics of a common industrial controlled process by adopting three characteristic parameters of open-loop gain K, a time constant T and delay time L;
step 2: applying a step signal with constant amplitude to the industrial controlled process, recording as r (t), and acquiring an output value of the industrial controlled process by a sampling period delta t, recording as y (t), wherein t is running time and has a unit of second;
and step 3: calculating the power y of y (t)2The third power y of (t) and y (t)3(t) and calculating the obtained y (t) and y2(t) and y3(t) corresponding accumulated value A1、A2And A3；
And 4, step 4: according to the output value y (t) obtained in the step 2 and the accumulated value A obtained by calculation in the step 31、A2、A3The method comprises the following steps of calculating three characteristic parameters of the industrial controlled process, including open-loop gain K, a time constant T and delay time L, wherein when the output of the industrial controlled process reaches a steady state under the action of a step signal with the amplitude of R, the open-loop gain K, the time constant T and the delay time L are calculated by a formula (3):
the time constant T and the delay time L are both in units of seconds.
2. The method for rapidly identifying the characteristic parameters of the industrial controlled process according to claim 1, wherein: the industrially controlled process is described using formula (1):
in formula (1), K is an open-loop gain, T is a time constant, L is a delay time, r (T) is an input signal of the industrial controlled process, y (T) is an output value of the industrial controlled process, and T is a running time;
recording the step signal with the applied amplitude value R of the industrial process as R (t) ═ R, collecting the output value y (t) of the industrial controlled process by the sampling period delta t, and calculating y (t), y (t) and y according to the formula (2)2(t) and y3(t) respective corresponding accumulated values A1、A2And A3Wherein formula (2) is as follows:
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| CN102722101A (en) * | 2012-06-26 | 2012-10-10 | 广东电网公司电力科学研究院 | Identification method and identification system based on closed-loop frequency domain |
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