Modified Reference Model for Rotor Flux-Based MRAS Speed Observer Using Neural Network Controller

ABSTRACT

The poor low speed performance of rotor flux-based model reference adaptive system (MRAS) is due to the presence of integrator and parameter variation with temperature. To improve low speed performance, a novel rotor flux-based MRAS method is proposed and neural network controller (NNC) is used in place of PI controller in reference model and adaptation mechanism. In this method, a compensating voltage is added to the d–q axis rotor flux equations of induction motor (IM) by modifying voltage model to reduce DC drift and initial value problems of integrator. NNC is implemented in both modified reference model to obtain the drift voltage and in adaptation mechanism to accurately estimate the rotor speed. The proposed scheme is experimentally implemented using dSPACE ds-1104 R&D controller board with improved speed response compared to rotor flux-based MRAS.

KEYWORDS:

• Induction motor
• Model reference adaptive system
• Neural networks
• Vector control

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Giribabu D

Giribabu D was born in Hyderabad (Telangana), India, in 1983. He did BTech in electrical and electronics engineering and MTech in power electronics from JNTU Hyderabad, Telangana, India, in the years 2006 and 2008, respectively, and the PhD degree in electrical engineering in Indian Institute of Technology (IIT) Roorkee, India. Currently, he is with National Institute of Technology (NIT) Kurukshetra, India, where he is an assistant professor in the Department of Electrical Engineering. He is a member of IEEE. His research interests include Multi Level Inverters, Electric Drives, Artificial Intelligence, and Renewable Energy Sources.

Corresponding author. E-mail: [email protected]

S.P. Srivastava

S.P. Srivastava was born in Uttar Pradesh, India, in 1954. He received the Bachelor's and Master's degrees in electrical technology from I.T. Banarus Hindu University, Varanasi, India, in 1976 and 1979, respectively, and the PhD degree in electrical engineering from the University of Roorkee, India, in 1993. Currently, he is with Indian Institute of Technology (IIT) Roorkee, India, where he is a head of Department of Electrical Engineering. His research interests include Electric Machines, Drives, Power Electronics, and Energy Efficient Machines.

E-mail: [email protected]

M.K. Pathak

M.K. Pathak was born in Hamirpur (HP), India, in 1966. He did his graduation in electrical engineering from LD Engineering College, Ahmadabad (Gujarat), India, in 1986. He joined Electrical Engineering Department of NIT, Kurukshetra (Haryana), India, as a Lecturer in 1987. In 1989, he joined Electrical Engineering Department of NIT, Hamirpur (HP), and India, where he served till 2007. Presently, he is working as an associate professor in Electrical Engineering Department of IIT Roorkee, India, where he joined in 2007. He obtained both his MTech (Power Electronics, Electrical Machines and Drives) and PhD degrees from IIT Delhi, India. He has co-authored a book on Electric Machines. He is a member of IEEE, life fellow of Institution of Engineers (India), and life member of Indian Society for Technical Education (ISTE) and Systems Society of India (SSI).

E-mail: [email protected], [email protected]