Single-Phase Rectifier with Cascaded-Transformer to Supply a Three-Phase Induction Motor with Open-End Windings
DOI:
https://doi.org/10.18618/REP.e202538Keywords:
AC-DC-AC multilevel converters, cascaded-transformers converter, open-end winding induction motor, single-phase to three-phaseAbstract
This paper presents a single-phase to three-phase AC-DC-AC step-down converter with a symmetrical DC-link voltage ratio. The proposed converter architecture is well-suited for rural distribution grid applications, where a high-voltage single-phase grid is required to transmit energy over long distances while minimizing conduction losses. The converter consists of two cascaded H-bridge converters connected via transformers and two three-phase inverters supplying an open-end winding induction motor (OEWIM). The level-shifted pulse-width modulation (LSPWM) strategy is employed to synthesize the converter voltages. A proportional-integral (PI) controller regulates the overall DC-link voltages, while a hysteresis controller maintains the balance of the individual DC-link voltages. Additionally, a resonant PI controller ensures a sinusoidal grid current, and a Phase-Locked Loop (PLL) is used to achieve a high power factor in the grid. Compared to a conventional two-level leg topology, the proposed configuration reduces harmonic distortion and semiconductor power losses while ensuring a high power factor.
Simulation and experimental results validate the effectiveness of the PWM and control strategies.
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Copyright (c) 2025 Antônio D. D. Almeida, Bruna S. Gehrke, Nady Rocha, Edgard L. L. Fabricio, Carolina A. Caldeira, Gleice M. S. Rodrigues, Isaac S. de Freitas

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