scholarly journals Automatic Regulation Time Series for Industry Processes

2012 ◽  
Vol 2012 ◽  
pp. 1-16 ◽  
Author(s):  
Tain-Sou Tsay
Keyword(s):  
Time Series ◽  
Delay System ◽  
High Order ◽  
Order System ◽  
Automatic Regulation ◽  
Turbine Engine ◽  
High Order System ◽  
System A ◽  
Reference Input ◽  
Input Command

A nonlinear digital control scheme is proposed for analyses and designs of stable industry processes. It is derived from the converging characteristic of a specified numerical time series. The ratios of neighbourhoods of the series are formulated as a function of the output of the plant and the reference input command and will be converted to be unities after the output has tracked the reference input command. Lead compensations are also found by another numerical time series to speed up the system responses on the online adjusting manner. A servosystem, a time-delay system, a high-order system, a very-high-order system, and a 2 × 2 multivariable aircraft gas turbine engine are used to illustrate effectiveness of the proposed nonlinear digital controller. Comparisons with other conventional methods are also made.

Lower-Order Active Disturbance Rejection Control and Frequency Analysis of High Order System

2017 ◽  
Author(s):  
Ruiqing Zhang ◽  
Shubo Zhang ◽  
Yali Xue ◽  
Yu Hu ◽  
Wendi Wang
Keyword(s):  
Transfer Function ◽  
Frequency Analysis ◽  
Lower Order ◽  
Disturbance Rejection ◽  
High Order ◽  
Order System ◽  
Active Disturbance Rejection Control ◽  
High Order System ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control

Linear active disturbance rejection control (LADRC) has been paid much attention in academic and industrial fields. However, the selection of the order for LADRC controller design and the choice of parameter b0 in system correcting are key facts which are still being faced by designer. In this paper, an effective method about how to select the order of LADRC and the parameter b0 is given first. Frequency analysis often used by engineers for designing controller, the normal transfer function form of LADRC is constructed, so the loop gain, close loop transfer function and disturbance transfer function to a general high-order system are presented and can be easily used. The example shows that the proposed method is easy to apply and verified the lower-order LADRC can obtain the better effective than PID and high-order LADRC, and the frequency response analysis of a thermal power plant is elaborated and the simulation result indicates that LADRC has a strong robustness against the large variation of parameters in the plant mode.

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