Abstract
Both Hybrid Electric Vehicles (HEVs) and Electric Vehicles (EVs) need a traction motor and a power in-verter to drive the traction motor. The requirements for the power inverter include high peak power, opti-mum consumption of energy, low output harmonics and inexpensive circuit. In this paper, a new structure of multilevel inverter with reduced number of switches is proposed for electric vehicle applications. It consists of an H-bridge and an inverter in each phase which produces multilevel voltage by switching the dc voltage sources in series. As the number of switches are reduced, both conduction and switching losses will be de-creased, which leads to increase the efficiency of converter. The size and power consumption of driving cir-cuits are also reduced. The proposed three phase inverter can produces more number of voltage levels in the same number of the voltage source and reduced number of switches compared to the conventional inverters. This structure minimizes the total harmonic distortion (THD) of the output voltage waveforms. The structure of proposed multilevel inverter, modulation method, switching losses, THD calculation and simulation re-sults with PSCAD/EMTDC software are shown in this paper.
Highlights
During the past few years, power electronic engineers have paid great attention to multilevel inverters as a new kind of power converter
A new structure of multilevel inverter with reduced number of switches is proposed for electric vehicle applications
The proposed three phase inverter can produces more number of voltage levels in the same number of the voltage source and reduced number of switches compared to the conventional inverters
Summary
During the past few years, power electronic engineers have paid great attention to multilevel inverters as a new kind of power converter. Multilevel inverters are used to drive many electrical machines such as EVs and HEVs [9,10,11]. 2) Higher efficiency is expected for these multilevel converter systems because higher voltages can be utilized and the switching frequency of the devices is at a minimum. One of the important issues in the mentioned machines is optimum consumption of energy For this reason, power consumption of driving circuits of machines driving inverter should be reduced. On the other hand, when inverter switches sustain high voltage, their switching frequency is restricted. In this state, the output waveform of inverter is distorted and the reliability of the motor is reduced. In order to overcome to the problem, voltage of switches must be decreased
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