Control Strategy for Energy Management of Battery and Supercapacitor Hybrid Electric Vehicle
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Date
2018-10
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Publisher
MPUAT, Udaipur
Abstract
Electric vehicles are becoming the new era of public transport now a days. Many discoveries have been made to improve these vehicles and for the same prospect many new energy sources have also been discovered. But still battery remains the primary source for these vehicles. Batteries are a very efficient energy storage device but due to their low power density property and lack of sustaining high discharge currents using them alone in electric vehicle is not such a good option.
Batteries are a high energy density device which can store high energy in less mass but it is a low power density device meaning the rate of giving out that power is very slow. Also, we know that taking high current from battery deteriorates its health and causes it to age faster. Electric vehicles have high and varying load profile i.e., they need high load current with sudden ups and downs and these load conditions are not favorable for batteries. To rectify this disability of battery to work in electric vehicles an auxiliary device should be connected which can share load with battery and can work efficiently in transient conditions.
Supercapacitor being a high power density device proves to be useful in these condition as this property allows it to supply power at high rate. It work well in transient conditions. When used in hybridization with battery it can share load, can work in transient conditions and can charge quickly with the excess power of battery.
Without a proper management no system can work efficiently, likewise without a proper energy management strategy no energy storage system can work efficiently. An energy management system, is must to divide power between the sources so that they work at their best efficiency.
The objective of this research is to develop an energy management strategy for a Battery/Supercapacitor hybrid combination in electric vehicles. The objective is to make a strategy which divides power between the sources such that the sources work at their best efficiency level.
Thus in this research we have studied on a parallel hybrid system of battery and supercapacitor and a rule based energy management strategy is developed to divide power between these sources considering their state of charge levels and maximum allowable power.
Description
Control Strategy, Energy Management Battery, Supercapacitor, Hybrid Electric Vehicle
Keywords
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Citation
Sharma, B. And Maherchandani, J.K.