Both Hybrid Electric Vehicles (HEVs) and Electric Vehicles (EVs) need a traction motor and a power in-verter to drive the traction motor. The requirements for the power inverter include high peak power, opti-mum consu...Both Hybrid Electric Vehicles (HEVs) and Electric Vehicles (EVs) need a traction motor and a power in-verter to drive the traction motor. The requirements for the power inverter include high peak power, opti-mum consumption of energy, low output harmonics and inexpensive circuit. In this paper, a new structure of multilevel inverter with reduced number of switches is proposed for electric vehicle applications. It consists of an H-bridge and an inverter in each phase which produces multilevel voltage by switching the dc voltage sources in series. As the number of switches are reduced, both conduction and switching losses will be de-creased, which leads to increase the efficiency of converter. The size and power consumption of driving cir-cuits are also reduced. The proposed three phase inverter can produces more number of voltage levels in the same number of the voltage source and reduced number of switches compared to the conventional inverters. This structure minimizes the total harmonic distortion (THD) of the output voltage waveforms. The structure of proposed multilevel inverter, modulation method, switching losses, THD calculation and simulation re-sults with PSCAD/EMTDC software are shown in this paper.展开更多
电动汽车驱动系统的核心技术就是对电动机的控制,目前比较流行采用的是矢量控制(FOC)和直接转矩控制(DTC)。然而这两种方法有各自的优缺点,为了能够满足电动汽车在不同的工况下转矩和速度的要求,通过把FOC和DTC这两种控制方法结合在一起...电动汽车驱动系统的核心技术就是对电动机的控制,目前比较流行采用的是矢量控制(FOC)和直接转矩控制(DTC)。然而这两种方法有各自的优缺点,为了能够满足电动汽车在不同的工况下转矩和速度的要求,通过把FOC和DTC这两种控制方法结合在一起,取长补短,形成一种对异步电动机的混合控制方法。其次,还搭建了该控制系统的Matlab仿真模型和基于DSP2812的硬件电路,通过Matlab和DSP之间的连接工具Real Time Workshop生成混合控制的C语言程序,并编译、下载和调试,最终控制一台小功率鼠笼式异步电动机,验证了混合控制方案的可行性。展开更多
文摘Both Hybrid Electric Vehicles (HEVs) and Electric Vehicles (EVs) need a traction motor and a power in-verter to drive the traction motor. The requirements for the power inverter include high peak power, opti-mum consumption of energy, low output harmonics and inexpensive circuit. In this paper, a new structure of multilevel inverter with reduced number of switches is proposed for electric vehicle applications. It consists of an H-bridge and an inverter in each phase which produces multilevel voltage by switching the dc voltage sources in series. As the number of switches are reduced, both conduction and switching losses will be de-creased, which leads to increase the efficiency of converter. The size and power consumption of driving cir-cuits are also reduced. The proposed three phase inverter can produces more number of voltage levels in the same number of the voltage source and reduced number of switches compared to the conventional inverters. This structure minimizes the total harmonic distortion (THD) of the output voltage waveforms. The structure of proposed multilevel inverter, modulation method, switching losses, THD calculation and simulation re-sults with PSCAD/EMTDC software are shown in this paper.
文摘电动汽车驱动系统的核心技术就是对电动机的控制,目前比较流行采用的是矢量控制(FOC)和直接转矩控制(DTC)。然而这两种方法有各自的优缺点,为了能够满足电动汽车在不同的工况下转矩和速度的要求,通过把FOC和DTC这两种控制方法结合在一起,取长补短,形成一种对异步电动机的混合控制方法。其次,还搭建了该控制系统的Matlab仿真模型和基于DSP2812的硬件电路,通过Matlab和DSP之间的连接工具Real Time Workshop生成混合控制的C语言程序,并编译、下载和调试,最终控制一台小功率鼠笼式异步电动机,验证了混合控制方案的可行性。
