Closed-loop system identification method based on slope response and known time delay

A closed-loop system and identification method technology, applied in the field of automatic control, can solve problems such as failure of advanced control methods, optimization of control strategies, and basis of pathological calculations

Active Publication Date: 2020-12-18
HUADIAN WEIFANG POWER GENERATION CO LTD
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Problems solved by technology

[0003] However, the closed-loop identification based on closed-loop excitation currently researched is generally a discrete system. Since the discrete system is significantly affected by the sampling period, the unreasonable sampling period will bring a pathological calculation basis, which is difficult to be found in the obtained model. , then it will cause the failure of control strategy optimization improvement and implementation of advanced control methods

Method used

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Embodiment approach

[0072] 1) The controlled object to be identified is described by the transfer function of second-order inertia plus pure delay. The mathematical expression of the controlled object is as follows:

[0073]

[0074] Among them, G(s) is the transfer function of the controlled object, s and τ are the differential operator and the known delay constant of the controlled object respectively, k, a 1 and a 2 It is the parameter that needs to be identified for the controlled object; the delay constant of the controlled object generally has 0≤τ≤100;

[0075] 2) Acquisition The closed-loop system starts to experience a slope response from the steady state and reaches a new steady state value, and collects the input data set R during this time period 0 and the output dataset Y 0 , the length of the data is n, and the sampling period is ΔT; the input data set R 0 and the output dataset Y 0 The forms are as follows:

[0076] R 0 =[r 0 (1),...,r 0 (i),...,r 0 (n)]

[0077] Y 0 =...

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Abstract

The invention provides a closed-loop system identification method based on slope response and known time delay, and belongs to the technical field of automatic control. The method comprises step: describing a controlled object by adopting a second-order inertia and pure delay transfer function; calculating the input data set and the output data set collected in the slope response process to obtainan available input data set and an available output data set; obtaining a processing input data set and a processing output data set through algebraic operation based on the available input data setand the available output data set; based on the feedback controller coefficient, processing the input data set and the output data set, calculating to obtain a final data set, and obtaining a final big data set through algebraic transformation; and obtaining a to-be-identified coefficient of the controlled object through matrix calculation based on the obtained last big data set and the availableoutput data set. According to the method, the controlled object can be identified as a continuous system, a basis is provided for dynamic characteristic analysis and controller design optimization ofthe controlled object, and the method has good industrial application potential.

Description

technical field [0001] The invention belongs to the technical field of automatic control, in particular to a closed-loop system identification method based on slope response and known time lag. Background technique [0002] In the fields of chemical industry and energy, in order to ensure the stability and safety of production equipment and production process, system identification based on open-loop excitation is difficult to be applied. In order to achieve system identification based on closed-loop excitation, it is generally necessary to perform closed-loop excitation on the system to be identified in the chemical and energy fields. Step signal excitation is a closed-loop excitation method that is relatively easy to implement in the chemical and energy fields. The change is easy to cause irreversible damage to the actuator, so it is difficult to be allowed to be applied in practice. For example, the load change in the thermal power unit is generally realized by the ramp s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042Y02P90/02
Inventor 荆立坤马春雷宋宝玉
Owner HUADIAN WEIFANG POWER GENERATION CO LTD
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