Optimisation of switching frequency of three-phase four-wire inverter under different dead time Online publication date: Tue, 31-May-2022
by Fuzhuan Wu; Mengna Chen; Sheng Peng; Shengjun Wen
International Journal of Advanced Mechatronic Systems (IJAMECHS), Vol. 9, No. 4, 2022
Abstract: Aiming at the selection of inverter switching frequency and the harmonic problem of the dead time in reality, an optimal method for switching frequency of three-phase four-wire inverters considering the dead time to reduce the total harmonic distortion (THD) was proposed. Firstly, the output sinusoidal pulse width modulation (SPWM) wave was analysed by using double Fourier transform and Bessel function, and the spectrum of SPWM with dead time was obtained. Secondly, the relationship between the THD of the output voltage and the switching frequency was analysed. The study found that there is an optimal switching frequency to minimise the output voltage THD. Thirdly, the linear Lagrangian interpolation method was used to fit the formula for selecting the optimal switching frequency with different dead time. Finally, a three-phase four-wire inverter test prototype based on the TMS320F28335 control chip was built, and the effectiveness of the proposed method was verified through experiments.
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