Scientific and Technical Journal


ISSN Print 2221-3937
ISSN Online 2221-3805
The electric vehicle drive with an independent power supply with supercapacitor battery and dc-dc converter is the object of this study. Electric vehicles nowadays become more and more popular, com-peting with the internal combustion engine vehicles. However, the electric vehicle drives have some consid-erable drawbacks. Even though the efficiency of the electric motor is significantly greater than the one ofinternal combustion engines, other elements of the drive such as power supply produce heat losses as well.Reducing these losses will lead to decreasing of energy consumption of electric vehicles and therefore willhelp them to become more competitive on the vehicle market. The Li-Ion accumulators, which are used asthe power supply, have large impedance that leads to significant energy losses on this element. The solutionof this problem can be found by connecting a supercapacitor battery in-parallel to the accumulator, whichwill help reducing these losses. It is important, though, to know the exact magnitude of the battery capaci-tance needed for the drive due to the expensiveness and big weight of supercapacitors. In order to find thisoptimal capacitance for a specific electric vehicle – electric scooter – a Matlab Simulink model of the elec-tric drive was created in this study. The modeling has shown that there is indeed the specific magnitude ofthe capacitance, using which the least possible energy consumption is achieved. Moreover it is possible toreduce the losses even more by implementing in the circuit a supercapacitor recharging system, created,modeled, and described in this work. This system does not require any additional power components in theelectric drive scheme and therefore does not increase the cost and energy consumption of the whole drive. Itwas calculated in this study that with usage of both the correct supercapacitor and the recharging system theenergy consumption of the electric scooter working on the urban drive cycle can be decreased by 5.23%.
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18 Feb 2019

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