高充电接受率电动车能量回馈控制策略

Control Strategy for Energy Regeneration of Electric Vehicle with High Charge Current Acceptance

为了提升制动模式下铅酸蓄电池的充电接受率,提出了一种轻型电动车的能量回馈控制策略。该控制策略是:藉助无刷直流电机(BLDCM)PWM整流电路,在正常和回馈两种工作模式下分别提供两种不同的PWM波形;当处于回馈模式时,调节PWM序列脉冲波形,进行瞬时快速充电并间歇放电,从而取得高效储能的实效。将所提出的PWM能量回馈控制法与Boost升压电路法进行了对比实验。结果表明:与Boost法相比,在相同的行驶条件下PWM法蓄电池充电接受率约提高6.5%,而车辆行驶里程延长约为6.3%,实现了电动车蓄电池一次高效率的充电。

This paper proposed a control method in order to obtain high charge current acceptance in energy regeneration for the battery during electric brake of light electric vehicle （EV）. With a BLDCM PWM converter circuit, it used special PWM control method in normal and energy-regeneration modes to realize periodical swift charge and recharge for the battery which can come to the state of pulse quick charge with high efficiency in the energy-regeneration modes. The performance of the proposed method was compared with the Boost converter energy regeneration method through experiment. The result indicates that the PWM energy regeneration control method can increase the average charge current acceptance by 6.5% and the driving range of the EV by 6.3% compared with the Boost converter energy regeneration method operating on the same driving condition. Thus, the efficiency of EV with one charge is increased.