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High Performance Control of AC Drives with Matlab / Simulink Models by Jaroslaw Guzinski, Atif Iqbal, Haitham Abu-Rub

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6.2 Dynamic System Linearization using Non-Linear Feedback

The linearity of the control system using non-linear feedback requires the accessibility to all state variables. It is assumed that all necessary variables are measured and directly calculated or estimated using a model or observer system.

The linearization process of non-linear systems is widely discussed in [2,3,8,26,27]. To use non-linear feedback, it is desirable to obtain a mathematical description of the non-linear dynamic system as a system of differential equations. It is assumed that the dynamic system is described by equations [2,3,8,19]:

(6.1) equation

where

img are vector functions.

Methods of differential geometry [8] make it possible to convert the above-described system by using a non-linear change of variables and non-linear feedback to the next form:

(6.2) equation

where A and B are constant matrices, so that a pair (A, B) is controllable.

Linearization of the system using variables transformation and non-linear feedback may be realized, as in [8] The first step of linearization is to choose new variables:

(6.3) equation

such that the differential ...

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