Nonlinear Fractional Order Model Identification of the Voltage Source Inverter Fed Induction Motor

Abstract

This paper presents a new nonlinear fractional-order model identification of a two-level voltage source inverter fed induction motor (VSI-IM). The nonlinearities present in inverter and IM cause the failure of the sensorless controls and model predictive controls, which mainly depends on the VSI-IM model. In the proposed work, an attempt has been made to identify the exact nonlinear behavior of the VSI-IM model using the PWM signal injection method. The identified fractional-order VSI-IM model is helpful to provide more insight into the dynamic behavior of the IM drive in the speed controller design (sensorless and sensored) and in predictive controls (model-based and model-free). The fractional VSI-IM models are identified at low, medium, and high frequencies. The best fit of these models is compared to the integer-order identified VSI-IM models. The experimental study clearly shows that the fractional-order VSI-IM identified model is superior to the integer-order VSI-IM model in terms of best fit with the actual hardware speed response.

KEYWORDS:

• Induction motor
• Integer-order model
• Nonlinear fractional-order model
• Two-level voltage source inverter

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Sudheer Adigintla

Sudheer Adigintla received BE degree in electrical engineering from Narayana College of Engineering, Guntur, Andhra Pradesh, India in 2014 and the MTech degree in electrical power system from JNTUA College of Engineering, Pulivendula, Andhra Pradesh, India in 2018. Since Jul. 2019 he is pursuing the PhD degree with the VNIT, Nagpur, India. His current research includes FO control, three-phase electrical drives, power electronics and drives, load frequency control. Corresponding author. E-mail: [email protected]

Mohan V. Aware

MohanV.Aware received the BE degree in electrical engineering from the College of Engineering, Amravati, India, in 1980, the MTech degree in power apparatus and systems from the Indian Institute of Technology, Bombay, India, in 1982, and the PhD degree in direct torque control for induction motor drives from Nagpur University, Nagpur, India, in 2002.From 1982 to 1989, he was a design officer at Crompton Greaves Ltd., Nasik, India. From 1989 to 1991, he was a development engineer at Nippon Denro Ispat Ltd., Nagpur. From 2001 to 2002, he was a research fellow in the Department of Electrical Engineering, Hong Kong Polytechnic University, Hong Kong, China. He is currently working as a professor with the Department of Electrical Engineering, Visvesvaraya National Institute of Technology, Nagpur. He authored and coauthored more than 200 technical papers in different journals and conference proceedings. His current research interests include multiphase electrical drives, distributed generation, energy storage systems, and power electronics. Dr Aware is a Commonwealth Academic Fellow. Email: [email protected]