【作者】 边晓光；

【导师】 胡长生； 徐德鸿；

【作者基本信息】 浙江大学 ， 电力电子及电力传动， 2012， 硕士

【摘要】 电动汽车的车载能源系统一直是决定和限制电动汽车发展、应用的关键技术,由于动力蓄电池具有的优良特性,使其成为电动汽车最常使用的车载储能元件。但由于目前技术上的限制,动力蓄电池的特性也有明显的局限,如功率密度的限制：电动汽车在起动、加速和爬坡时,蓄电池需要大电流放电,而在制动、减速回收能量时会发生大电流快速充电,这些情况会对蓄电池造成伤害,减少蓄电池寿命。单纯应用蓄电池作为车载储能系统不能完全满足电动汽车的性能需求,本论文选择超级电容和Bi-DC/DC变流器组成电动汽车辅助动力系统,以弥补蓄电池的特性局限,满足性能需求。论文首先根据电动汽车的需求分析了电动汽车辅助动力系统相应的需求,具体设计了电动汽车辅助动力系统的结构和功能：主要为动力补偿和再生制动能量回收两方面功能。然后提出了电动汽车辅助动力系统整体控制策略,包括Bi-DC/DC变流器控制方法和工作模式切换策略,以实现动力补偿、能量回收两种功能的有效工作和平滑切换。接着,分别具体设计了电动汽车辅助动力系统在动力补偿模式和能量回收模式下Bi-DC/DC变流器的控制策略,并通过Bi-DC/DC变流器的小信号模型的建立,设计了相应的控制器参数。最后,通过实验验证了电动汽车辅助动力系统动力补偿功能和能量回收功能,以及两种工作模式间的切换策略,并通过车载实验,证实了电动汽车辅助动力系统的控制及切换策略的正确性和有效性。更多还原

【Abstract】 Energy storage systems of electric vehicles are key technologies which decide and limit the development and application of electric vehicles. With good characteristics, batteries are often used as power sources of electric vehicles. But the characteristics of battery also have obvious limitations, such as the limitation of power density. When EV fast start, accelerate or climb, battery is discharged in high-current, and when EV brake or slow down, battery is charged in high-current. These situations may damage the battery and reduce battery’s lifespan. To meet requirements of EV’s power performance, this paper design EV auxiliary power system which is consisting of super capacitor and Bi-DC/DC converter,and it can be applied to make up for the limitations of battery.Firstly, this paper find corresponding needs of electric vehicle auxiliary power system according to the needs of electric vehicles. Power compensation and regenerative braking energy recovery are two main functions of electric vehicle auxiliary power system. The control strategies of the EV auxiliary power system which is focus on the control method of Bi-DC/DC converter and mode-switching strategies of Bi-DC/DC is designed.Then the closed-loop parameters of Bi-DC/DC converter in Boost mode and Buck mode are designed.Finally, experimental is done with a 5kW Bi-DC/DC converter of EV auxiliary power system. Experimental results demonstrate the effectiveness of the proposed strategies.更多还原