Space vector modulation of multilevel inverters with online vector identification and reduced switching losses for HEV/EV applications
by Scott Cash; Quan Zhou; Oluremi Olatunbosun; Hongming Xu
International Journal of Power Electronics (IJPELEC), Vol. 14, No. 3, 2021

Abstract: Multilevel inverters are used in a wide range of medium-high power applications including hybrid and electric vehicles (HEV/EV). This paper investigates an online reduced intermediate switching space vector pulse width modulation (RIS-SVPWM) scheme to minimise switching losses without the need for large lookup tables or severely diminishing output harmonic quality. While previous online methods only calculate the switching patterns of a single enclosing voltage vector, this RIS-SVPWM method calculates all the switching patterns surrounding the reference voltage by incorporating only two more additional mapping iterations into the online algorithm regardless of the inverter level. The RIS-SVPWM method can operate in the sinusoidal, overmodulation mode-I and overmodulation mode-II regions of various inverter voltage levels and topologies. The performance of the RIS-SVPWM algorithm is examined over the entire driving range of an HEV/EV by controlling a MATLAB/Simulink model of a three-phase five-level cascade H-bridge inverter powering an induction motor model. The results of the simulation study show that there is a reduction in intermediate switching by up to 90% and a total switching reduction by 30% over a previous online SVPWM algorithm while maintaining acceptable voltage and current waveform harmonic quality.

Online publication date: Mon, 13-Sep-2021

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