On board energy management system for Electric Vehicle (EV) defines the fuel economy and all electric range. Charging and discharging of energy storage devices take place during running as well as stand-still conditions. Battery-alone EV suffers from range anxiety, current drain during peak power demand and less battery life. It depends on the grid for charging and thus the increasing popularity of EV is increasing burden on the grid. Different energy storage devices are available which could be used on board to form a hybrid energy storage system. Batteries, Ultra-capacitors and fuel cells are some of them. Such a system will act as a stress reduction factor and increase the battery life. In this paper, a detail literature review of various energy storage devices that can be used in EV is presented. A comparative study of various topologies available for this purpose is also presented. Finally, a detailed review of Energy Management Strategy (EMS) is presented with current trends and research gaps i.e., challenges.
The ultracapacitor (UC) acts as a stress reducer for the battery. It is also considered as a fruitful companion for a battery in battery-UC hybrid energy storage system (HESS). Management of power between battery, UC, and drive motor, along with a suitable topology, decides the performance of the battery and drive system. Rule based energy management strategy (EMS) is simple, real-time implementable, ease in control, and based on engineer’s experience. But it lacks in controlling the state-of-charge (SOC) of battery and UC, battery current rate, and its magnitude, dc link voltage control, and UC voltage regulation. In this paper, low pass filter based conventional rule-based EMS is studied and implemented in MATLAB. Then fuzzy logic based modified rule-based EMS is proposed and simulated for the same load profile. Comparative study between conventional and modified EMS shows the proposed EMS is capable to provide constant dc link voltage, stable UC SOC operation, fast response, and reduces the large variation in speed. Proposed EMS saves the 10% of the battery energy for 20 sec load profiles as compared with battery only system. So, by use of UC, shared bus topology, and effective EMS, driving range of the vehicle and battery life can be improved and range anxiety can be reduced.
The use of solar energy has been adduced as an alternative way for generating electricity. This electricity is generated by solar panel but as temperature increases efficiency of panel decreases too. The main objective of this research paper is to minimize the use of the amount of water, electrical energy and required time needed for cooling of a solar panel. This paper discusses a new approach by acquiring water as a coolant for accomplishing Photovoltaic panels at their moderate temperature and limits it from overheating. It is the cheapest method to enhance the efficiency of the Photovoltaic panel in developing countries like India. This paper also analyses the material used in increasing the efficiency of PV panel.
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