The Operation of Over Modulated Dual-Inverter Fed Asynchronous Motor Drive

Mounika Gokari*, C. Nagamani**
*-** Department of Electrical and Electronics Engineering, Anurag Group of Institutions, Hyderabad, Telangana, India.
Periodicity:January - March'2021
DOI : https://doi.org/10.26634/jee.14.3.17907

Abstract

Multi-level inverters are popularly used in induction motor drive applications because of the advancements in power electronic devices. One of the interesting ways of producing three-level output voltage waveform is by using dual two-level inverter configuration feeding an open-end winding induction motor. In this open end induction motor configuration, neutral point of induction motor is isolated and two two-level inverter are connected from both sides of the winding. In case of conventional dual inverter fed induction motor supplied by a single DC source, zero sequence currents will find a path through motor phase winding and power electronic devices. Therefore a novel PWM technique is proposed to operate the drive in linear modulation region and over modulation region. The zero-sequence current is reduced by reducing the zero-sequence voltage to zero. The proposed PWM technique is used to reduce the zero sequence voltages by maintaining the sum of three phase reference voltages to zero. The switching frequency of the inverters is also significantly reduced as one inverter is completely clamped. As this configuration is using only two-level inverters, it will avoid all types of problems existing in the conventional three-level inverters. MATLAB/Simulation is used to validate the proposed inverter configuration with novel PWM technique.

Keywords

Multi-level Inverter Configurations, Induction Motor Drives,Sine-Triangle PWM, Simulation.

How to Cite this Article?

Gokari, M., and Nagamani, C. (2021). The Operation of Over Modulated Dual Inverter Fed Asynchronous Motor Drive. i-manager's Journal on Electrical Engineering, 14(3), 32-39. https://doi.org/10.26634/jee.14.3.17907

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