Abstract
In this study, a novel variable switching frequency pulse width modulation (VSFPWM) strategy is proposed to achieve improved electric vehicle inverter efficiency. The silicon carbide (SiC) MOSFET inverter has excellent switching characteristics, thus enabling pulse width modulation control with a high switching frequency. The high switching frequency can reduce the voltage ripples in DC-link capacitors, which enables their use at a reduced capacitance. The switching frequency is typically set to a level that is within the limits of the voltage ripple in the maximum output region. Given that the same switching frequency is applied to the entire operating region, there is a sufficient margin with respect to the limits of the voltage ripple in the low-to-medium output range. The proposed method is designed to consider the real-time minimum switching frequency by considering the voltage ripple of the capacitor during operation under loaded conditions, thereby minimizing the switching loss. In addition, the method is suitable for high-switching frequency control because the calculation time is short. Because it does not require additional hardware, it is easy to apply to the existing inverter. The validity of the proposed method was verified based on simulations and experiments.
Highlights
Because of the problems associated with air pollution from the emissions of internal combustion engine vehicles, electric vehicles (EVs), which are eco-friendly alternative means of transportation, have drawn attention as a solution to environmental problems [1,2,3].The representative electric components of EVs include motors, inverters, converters, and battery systems [4,5,6]
In this study, a novel variable switching frequency pulse width modulation (VSFPWM) strategy was proposed to improve the efficiency of the inverter used in EVs operated with Silicon carbide (SiC)-MOSFETs and high-switching frequency PWM
The SiC-MOSFET inverter has very good efficiency because of its excellent electrical properties, it is mostly used for high-switching frequency operation
Summary
Because of the problems associated with air pollution from the emissions of internal combustion engine vehicles, electric vehicles (EVs), which are eco-friendly alternative means of transportation, have drawn attention as a solution to environmental problems [1,2,3]. The problem of voltage ripples affects the battery state of health (SOH) To address these limitations, a previous study [12] proposed a PWM technique at a varying switching frequency to the minimum value that satisfies the voltage ripple condition of DC-link capacitors. A previous study [12] proposed a PWM technique at a varying switching frequency to the minimum value that satisfies the voltage ripple condition of DC-link capacitors With this approach, a separate current sensor needs to be added to the input side of the inverter, and the voltage ripple is observed through the integration of the sensed current. To address the limitations associated with previously published studies, a novel VSFPWM strategy to improve the efficiency of the SiC-MOSFET-based inverter for EVs is proposed in this paper.
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