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Method and system for tuning optimal pi controller parameters of low order system itae

A parameter setting and controller technology, applied in the field of PID control, can solve the problem of inapplicability of large delay objects, etc., and achieve the effect of small ITAE index, fast response speed and good control quality

Active Publication Date: 2018-03-20
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

[0008] It can be seen that the above methods are suitable for small delay objects, but not for large delay objects

Method used

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  • Method and system for tuning optimal pi controller parameters of low order system itae
  • Method and system for tuning optimal pi controller parameters of low order system itae
  • Method and system for tuning optimal pi controller parameters of low order system itae

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specific Embodiment

[0085] For the set value step disturbance, among several common PI tuning formulas, KL, GPM, Pole, IMC and the ITAE method in this paper are selected for simulation comparison.

[0086] In this embodiment, the temperature control of the fluidized bed is targeted, and the circulating fluidized bed boiler is a distributed parameter, nonlinear, time-varying, and multi-variable coupling control object. Among them, the influence of the change of fuel quantity on the bed temperature is a process of large inertia and large lag, and the transfer function under certain working conditions can be expressed as:

[0087]

[0088] The model parameters after the first order approximation are k=213.6, τ=1456s, L=537.2s. Let the nominal parameters change in the range of ±10%, n=10000, conduct a Monte Carlo random test, see the distribution of performance points of various methods figure 2 and Table 1.

[0089] Table 1 Performance index (CFB) when the nominal parameters change by ±10%

...

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Abstract

The present invention provides a low-order system ITAE optimal PI controller parameter tuning method and system. The method includes the following steps: obtaining the parameter domain of the controlled object, performing equal division processing on the interval of the parameter domain, and obtaining several groups Parameter value on the equalization point; Calculate the stable parameter field of the PI controller according to the parameter value on the described equalization point; Take the ITAE index as the objective function, carry out optimization calculation in the described stable parameter field, obtain the ITAE index maximum Optimal PI controller parameter values. A low-order system ITAE optimal PI controller parameter tuning method and system of the present invention do not need to perform approximate processing on the delay link of the model, and can be applied within a large relative delay time range while maintaining good control Quality, ITAE index is the smallest, and the response speed is fast.

Description

technical field [0001] The invention relates to the field of PID control, in particular to a method for tuning parameters of a PI controller with optimal ITAE in a low-order system and a parameter tuning system for a PI controller with an optimal ITAE in a low-order system. Background technique [0002] Applying modern control theory to design a control system requires an accurate mathematical model of the controlled object, which is difficult to meet in practical engineering. There are hundreds of control loops in modern industrial control systems. If the design and tuning of a single loop is cumbersome, the workload of designing and tuning the entire system will be huge. The PID (proportional-integral-derivative) controller has a simple structure, its concept is easy to understand, its algorithm is easy to implement, and it has certain robustness, so it is still widely used in the field of process control, unless it proves that it cannot meet the requirements under special...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
Inventor 黄卫剑潘凤萍伍宇忠郑闻成
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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