The present article introduces a new approach for designing three-phase power conversion with simple DC-DC converters. Conventionally, achieving three-phase pure sinusoidal waveforms involves three-power conversion stages: a DC-DC converter and a DC-AC inverter, followed by a filter circuit. The filter size can be minimized by replacing conventional 3-leg inverter with multilevel inverter (MLI) at the cost of higher semiconductor switches and driving circuits. However, both these approaches demand lengthy power conversion stages or more device count, which leads to increased size, volume, cost, complex control techniques, and losses, thus reducing overall efficiency. In response, the proposed solution adopts a streamlined architecture, utilizing a single power conversion stage comprising only one semiconductor switch per phase. The proposed inverter demonstrates its versatility in generating high-quality output voltage waveforms without filter circuits. A novel sinusoidal quantized switching technique (NSQST) is presented for generating three-phase sinusoidal output waveforms. The effectiveness of this proposed inverter is demonstrated through simulations using the MATLAB/SIMULINK tool, further validated through real-time simulations conducted on the OPAL-RT platform.
A Three-Switch Three-Phase Inverter with Novel Switching Approach for Grid-Connected Applications
2024-07-31
19993256 byte
Conference paper
Electronic Resource
English
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