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Low-complexity and adaptive saturation control method for nonlinear system

A non-linear system, low-complexity technology, applied in the field of non-linear system low-complexity adaptive saturation control, can solve problems such as large amount of calculation

Active Publication Date: 2019-07-12
JIANGSU VOCATIONAL INST OF ARCHITECTURAL TECH
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Problems solved by technology

Although the computational complexity can be greatly reduced, it is still computationally expensive to update NN or fuzzy logic system elements, especially for high-order nonlinear systems

Method used

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  • Low-complexity and adaptive saturation control method for nonlinear system
  • Low-complexity and adaptive saturation control method for nonlinear system
  • Low-complexity and adaptive saturation control method for nonlinear system

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Embodiment Construction

[0057]In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. Embodiments of the present invention will be described in detail be...

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Abstract

The invention discloses a low-complexity and adaptive saturation control method for a nonlinear system. The control method comprises the following steps of: firstly, converting control saturation nonlinearity into a linear model relative to an actual input signal by adopting a dead zone model; then, converting an original system with time-varying output constraint into unconstrained output constraint, and designing a new adaptive saturation control law along the filtered error manifold based on the system; and finally, by adopting the minimum learning parameter technology and the virtual errorconcept, only requiring update of two adaptive parameters on line to greatly reduce the calculation burden. Compared to the current work, the calculation amount of the adaptive scheme is small, and the asymptotic stability of the tracking error system can be ensured instead of the consistent final bounded stability. The adopted simulation shows that an improvement of about 4 times in tracking accuracy can be obtained, which demonstrates the effectiveness of the proposed control law.

Description

technical field [0001] The invention relates to a control algorithm, in particular to a low-complexity self-adaptive saturation control method for a nonlinear system. Background technique [0002] Over the past few decades, there has been increasing interest in the study of adaptive control system methods for nonlinear systems, such as Duffing-Holmes chaotic systems and reluctance motor systems, and remarkable research results have been achieved, such as based on Adaptive neural network (NN) control, perturbed strict feedback nonlinear systems, and barrier Lyapunov function (BLF) based output control are all used for strict feedback systems with unknown nonlinearities. [0003] Among existing adaptive control schemes, backstepping techniques have been developed as effective tools for dealing with nonlinear cascaded systems (also known as strict or pure feedback systems). For example, an adaptive neural control protocol based on input-to-state stability (ISS) was developed f...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 张刚刘志坚李德路侯文宝沈永跃吴玮
Owner JIANGSU VOCATIONAL INST OF ARCHITECTURAL TECH
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