A Robust Induction Motor Drive Using a Cascaded H-Bridge Inverter Under Hybrid Reaching Law-Based Control
Received: 2 June 2025 | Revised: 13 July 2025 | Accepted: 16 July 2025 | Online: 6 October 2025
Corresponding author: Thanh Lam Le
Abstract
A Hybrid Reaching Law (HRL)-based signal generation strategy is proposed to improve the modulation quality of a nine-level Cascaded H-Bridge (CHB) inverter-fed Induction Motor (IM) drive. The approach avoids the use of carrier-based waveforms by directly converting continuous control signals into discrete switching commands through quantization, enabling smooth voltage synthesis with reduced harmonic distortion. By combining the Sliding Mode Control (SMC) principles with a nonlinear reaching mechanism, the method enhances the robustness against the model uncertainties and external disturbances while effectively mitigating chattering. The control algorithm is designed for real-time digital implementation and is inherently compatible with modular CHB inverter architectures. Experimental validation using a Texas Instruments F28379D DSP and a 1 HP three-phase squirrel-cage IM demonstrates a stable voltage generation, acceptable Total Harmonic Distortion (THD), and reliable steady-state performance across different voltage levels. The proposed technique provides a practical and efficient solution for high-precision control in multilevel inverter-based motor drive systems.
Keywords:
induction motor drive, nine-level cascaded H-bridge inverter, nonlinear control, robust controlDownloads
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