Open AccessDiscrete sliding mode control based on exponential reaching law and time delay estimation for an asymmetrical six‐phase induction machine drive
Author(s) -
Kali Yassine,
Saad Maarouf,
DovalGandoy Jesus,
Rodas Jorge,
Benjelloun Khalid
Publication year - 2019
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.815
H-Index - 97
eISSN - 1751-8679
pISSN - 1751-8660
DOI - 10.1049/iet-epa.2019.0058
Subject(s) - control theory (sociology) , stator , rotor (electric) , induction motor , convergence (economics) , discrete time and continuous time , variable structure control , sliding mode control , engineering , controller (irrigation) , nonlinear system , computer science , voltage , mathematics , physics , control (management) , mechanical engineering , agronomy , statistics , electrical engineering , artificial intelligence , quantum mechanics , economics , biology , economic growth
This study deals with the problem of controlling rotor speed and stator currents of an asymmetrical six‐phase induction machine with uncertain dynamics, disturbances, and unmeasurable rotor currents and proposes a robust non‐linear variable structure controller. First of all, an outer control loop based on a proportional–integral regulator is performed to control the rotor speed and to construct the desired stator current references. Then, the inner loop is performed based on the proposed method that combines the time delay estimation method and discrete sliding mode control based on exponential reaching law. This structure allows an accurate and simple estimation of uncertainties and rotor currents, a high‐tracking precision, a convergence of the stator currents to their known desired references in finite‐time and chattering reduction. The design procedure is detailed step by step and the stability analysis and the convergence time are established for the current closed‐loop system. Experimental work was carried out on an asymmetrical six‐phase induction motor drive to show the effectiveness and performance of the proposed robust non‐linear discrete method. The results obtained highlighted the good tracking performance of the stator currents.