电动汽车复合能源系统再生制动分段控制策略研究

为了提高电动汽车复合能源系统的制动能量回收效率,对蓄电池,超级电容和双向DC/DC变换器相结合的复合能源系统和常规控制策略进行了研究,改进了复合能源系统,使其具有3种再生制动工作模式,并提出了再生制动分段控制策略。在高速段、中速段和低速段3个不同的阶段,采用了不同的再生制动控制方式,并根据超级电容电压、电机转速等因素确定了各阶段间切换时刻。通过电机制动电流和各阶段切换时刻优化控制,实现了平稳制动。以微型电动汽车为搭载对象,对常规控制策略和分段控制策略在两种不同初始制动车速下进行了制动工况的实测实验。实验结果表明,在分段控制策略作用下,微型电动汽车制动平稳,制动能量回收效率得到了提升。

Study on piecewise control strategy of braking energy regeneration for hybrid power system of electric vehicle

Aiming at improving the efficiency of braking energy regeneration in hybrid power system of electric vehicle, hybrid power system (HPS) with battery, ultracapacitor and bi-directional DC/DC converter and normal strategy were studied. HPS was improved, which created three modes of regeneration. Piecewise control strategy of braking energy regeneration was proposed. In high-speed, middle-speed and low-speed each section, different modes of regeneration were carried out. According to voltage of ultracapacitor, speed of motor and so on, time of switchover between the sections was decided. Based on control of braking current of motor and time of switchover, smooth braking was achieved. Normal strategy and piecewise control strategy were experimentalized in different velocities on a miniature electric vehicle. The experimental results indicate that the efficiency of braking energy regeneration increases and smooth braking is achieved by the piecewise control strategy. ABSTRACT FROM AUTHOR]