电力牵引系统拍频控制策略方法研究

Overview of Beat-less Control Strategy of Electric Traction System

交-直-交传动系统广泛应用于高速铁路牵引领域。由于单相脉冲整流器的工作特性,其输出直流电压含有频率为2倍电网频率的脉动分量。该分量在牵引电机侧会引起拍频现象,尤其当牵引逆变器工作频率接近2倍电网频率时最为严重。首先详细分析了直流电压脉动分量的来源和拍频现象产生的本质。然后,在取消LC谐振电路采用软件控制的情况下,列出三种现在主要的无拍频控制方法,详细介绍了各种方法的理论基础和优缺点,对拍频现象的来源及其影响进行了分析,综合比较了国内外各种拍频现象的抑制方法,并进行了归纳总结。

In inverter-converter driving systems forAC electric cars,the DC input voltage of an inverter contains a ripple component with a frequency that is twice the line voltage frequency,due to the use of a single-phase converter.The ripple component of the inverter input voltage causes pulsations in the torque and current of driving motors.To decrease the pulsations,a beat-less control method,which modifies the slip frequency depending on the ripple component,is applied to the inverter control.The suppression methods of beat phenomenon at home and abroad are compared.The advantages and disadvantages of control modes are summarized.