To address the issue of relatively high switching device loss caused by the Miller effect during low-speed operation of permanent magnet synchronous motors (PMSMs), a variable DC bus voltage control method based on a quasi-Z-source three-phase full-bridge inverter was proposed. By analyzing its boost modulation strategy, a mathematical model between motor speed and bus voltage was derived. The shoot-through signal duty ratio was then controlled to maintain the bus voltage at the minimum level required for the desired speed, thereby reducing switching losses. Simulation models were built on PSpice and Simulink platforms, and an experimental platform was developed for validation. Simulation and experimental results demonstrate that the proposed method effectively reduces the bus voltage under low-speed conditions, improves bus voltage utilization, and has practical application value.
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