Vibration Performance of a Power Electronic Transformer Under Different Phase-Shift Modulation Methods

Power electronic transformers (PETs) have attracted extensive attention in the fields of renewable energy and energy storage, and ac/dc hybrid distribution systems. This article analyzes the vibration generation and conduction of the high-frequency transformer, which is a key component of the PET. An experimental study is presented on the vibration characteristics of a ferrite transformer under different switching frequencies and phase-shift modulation methods. What is more, based on the three vibration sources of the transformer, a quantitative mathematical description between the core vibration acceleration and the excitation voltage and current is obtained under different phase-shifting modulation modes. The errors between the numerical calculated values and the experimental data are basically within 10%, which verifies the validity of the research and prediction of PETs vibration characteristics under different modulation modes.