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A predictive control framework for 3‐phase induction motors modeled in natural variables
Author(s) -
Bonci Cavalca Eduardo,
Nied Ademir,
Santos Matos Cavalca Mariana,
de Oliveira José
Publication year - 2017
Publication title -
optimal control applications and methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.458
H-Index - 44
eISSN - 1099-1514
pISSN - 0143-2087
DOI - 10.1002/oca.2307
Subject(s) - control theory (sociology) , model predictive control , induction motor , controller (irrigation) , linearization , integrator , three phase , stator , control engineering , state variable , computer science , filter (signal processing) , nonlinear system , operating point , engineering , voltage , control (management) , electronic engineering , artificial intelligence , mechanical engineering , agronomy , physics , quantum mechanics , electrical engineering , biology , thermodynamics , computer vision
Summary This paper presents a nonlinear control approach for 3‐phase induction motors. The proposed structure combines a 3‐phase predictive controller with an integrative reference filter. The predictive controller is designed based on an induction motor model established in natural variables (without using transformations), which is a nonlinear and time‐variant one. This model enables the controller to work independently with the supply voltages, considering unbalanced situations. A dynamic evaluation of the state equation coefficients is used to perform the process variables prediction, thereby executing a point‐to‐point linearization. The conversion of the rotation speed and stator flux modulus reference values is realized by a integrative 3‐phase referrer, which acts as a reference filter, expressing the references as 3‐phase signals and acting as an integrator to eliminate steady‐state errors. Also, a constraint feature is implemented, to reduce the currents. Simulation results satisfactorily show the proposed control architecture characteristics for various reference values and for motor operation as a brake and with load variation.