Novel Hysteresis Regulation Strategy for a Two-level Inverter Fed Induction Motor Drive to Achieve Nearly Constant Switching Frequency

Abstract

Constant switching frequency (CSF) is an important objective to be achieved by any control strategy deployed on a Voltage Source Inverter (VSI) so that the filter design will be easier. Though the invent of Multi-Level Inverters (MLI’s), the Two-Level Inverters (TLI’s) are widely used when it comes to current control strategies. In this paper, a new hysteresis current control strategy is proposed for a TLI in order to achieve nearly CSF. In this method, the constant switching frequency is achieved by creating a Variable Band (VB), which varies according to the switching frequency average of the pole voltage. The proposed control strategy creates VB’s such that it mimics the Continuous Space Vector Pulse Width Modulation (CSVPWM) and also the Bus-Clamping Pulse Width Modulation – 60° and 30° (BCPWM60 – BCPWM30). The paper also analyses the proposed control strategy under different criteria such as current THD, dynamic performance and parameter variation. This performance of the proposed strategy is simulated using MATLAB Simulink platform and experimentally validated on a 2.2 kW, three phase, Induction Motor (IM) using dSPACE-1103 kit.

KEYWORDS:

• Average pole voltage
• Bus clamping
• Hysteresis current control
• Induction motor
• Two-level inverter
• Variable band

Additional information

Notes on contributors

Joseph Peter

Joseph Peter received his BTech degree in electrical and electronics engineering from Mar Athanasious College of Engineering, Kothamangalam, Kerala, India, in 2009; and his MTech degree in power electronics and drives from VIT University, Vellore, Tamil Nadu, India, in 2012. He received his PhD degree from National Institute of Technology, Calicut, Kerala, India in 2018. He is presently working as an assistant professor in the Department of Electrical Engineering, SRM Institute of Science & Technology, Chennai. His current research interests include pulse width modulation techniques and current controlled ac drives.

Srikar Krishnatheeram

Srikar Krishnatheeram received his BTech degree in electrical and electronics engineering from SASTRA University, Tanjavore, India, in 2016; and his Master degree in power electronics from the National Institute of Technology, Calicut, Kerala, India, in 2018. He is presently working as a senior firmware design engineer at Delta Electronics Bangalore. His current research interests include pulse width modulation techniques and control for ac drives. Email: [email protected]

Rijil Ramchand

Rijil Ramchand received his BTech degree in electrical and electronics engineering from Calicut University, Calicut, India, in 1996; and his ME and PhD degrees from the Indian Institute of Science, Bangalore, India, in 2002 and 2010, respectively. He is presently working as a professor in the Department of Electrical Engineering, National Institute of Technology, Calicut, India. His current research interests include power converters, pulse width modulation techniques, multilevel inverters and current controlled ac drives. He is a senior member of IEEE. Email: [email protected]