Abstract
This paper presents a new hybrid cascaded H-bridge multilevel inverter motor drive DTC scheme for electric vehicles where each phase of the inverter can be implemented using a single DC source. Traditionally, each phase of the inverter requires DC source for output voltage levels. In this paper, a scheme is proposed that allows the use of a single DC source as the first DC source which would be available from batteries or fuel cells, with the remaining () DC sources being capacitors. This scheme can simultaneously maintain the capacitors of DC voltage level and produce a nearly sinusoidal output voltage due to its high number of output levels. In this context, high performances and efficient torque and flux control are obtained, enabling a DTC solution for hybrid multilevel inverter powered induction motor drives intended for electric vehicle propulsion. Simulations and experiments show that the proposed multilevel inverter and control scheme are effective and very attractive for embedded systems such as automotive applications.
Highlights
Automotive applications such as EV’s seem to constitute an increasingly effective alternative to conventional vehicles, allowing vehicle manufacturers to fulfill users requirements and environmental constraints [1].The electric propulsion system is the heart of EV
This paper presents a new hybrid cascaded H-bridge multilevel inverter motor drive DTC scheme for electric vehicles where each phase of the inverter can be implemented using a single DC source
A scheme is proposed that allows the use of a single DC source as the first DC source which would be available from batteries or fuel cells, with the remaining (n − 1) DC sources being capacitors
Summary
Automotive applications such as EV’s seem to constitute an increasingly effective alternative to conventional vehicles, allowing vehicle manufacturers to fulfill users requirements (dynamic performances and fuel consumption) and environmental constraints (pollutant emissions reduction) [1]. Several contributions that combine DTC principles together with PWM and SVM have been reported to correct these problems This approach is based on the load angle control, from which a voltage reference vector is computed which is modulated by the inverter [8]. If the converter is implemented with different semiconductor device technologies, different nature of DC sources (fuel cells, batteries, and supercapacitors) and/or if it presents a hybrid modulation strategy, it is classified as hybrid [13,14,15]. This structure greatly simplifies the converter complexity. The carried out simulations and experiments validate the voltage control strategy and confirm the high dynamic performance of the proposed method, presenting very low torque ripple
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