Discrete Wavelet Transform Based Power Management System for HESS for EV Applications

Vasu Suresh, S. Anand, K. Sundareswaran, Anshuman Patwa, T. Mithun
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Abstract

Recent developments in Electric Vehicles technologies have resulted in considerable advancement in Hybrid Energy Storage System (HESS) technology. Due to the modern driving style, the load demands are stochastic and contain high peak transients. These high peaks are responsible for degrading the health of the battery. A HESS which consists of a battery and an Ultracapacitor (UC) is suggested to overcome this disadvantage. This paper proposes a Power Management System which controls the flow of current between the ultracapacitor and battery by using a Discrete Wavelet Transform (DWT) to separate the high and low frequency components of current demand and optimally reducing the stress on the battery, hence, leading to better performance and longer life of the battery.
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基于离散小波变换的电动汽车HESS电源管理系统
近年来电动汽车技术的发展使得混合储能系统(HESS)技术取得了长足的进步。由于现代驾驶方式,负载需求是随机的,并且包含高峰值瞬态。这些峰值会降低电池的健康度。建议采用由电池和超级电容器(UC)组成的HESS来克服这一缺点。本文提出了一种电源管理系统,该系统通过离散小波变换(DWT)分离电流需求的高低频分量来控制超级电容器和电池之间的电流流动,从而最大限度地减少对电池的压力,从而提高电池的性能和寿命。
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