动态陷波滤波器在牵引变流器中的应用研究

Research on a Dynamic Notch Filter Applied to Traction Converters

牵引变流器是电力机车牵引传动系统的核心部件,也是牵引供电网的主要谐波来源之一。牵引变流器的整流侧采用单相四象限整流器,输出中含有二次脉动,包含二次脉动的中间直流环节电压进入控制环节,经运算得到给定的调制波含有低次谐波,导致调制出的整流器交流侧含有低次谐波。通过采用陷波滤波器滤除直流反馈量中的二次脉动,可以有效减少网侧低次谐波的产生。此外在"一带一路"的政策下,为了满足国家间的铁路运输互联互通,实现牵引变流器对不同供电频率的优化,需要对四象限整流器进行重新设计,抑制二次脉动带来的谐波影响。本文针对牵引变流器二次脉动对网侧电流谐波的影响以及陷波滤波器进行了深入分析,提出了一种引入前馈的动态陷波滤波器,可以根据牵引供电网的实际供电频率快速地调整陷波滤波器参数,并通过Matlab仿真及d SPACE半实物实验平台验证了其可行性。

Traction converter is the core components of electric locomotive traction drive system and it＇s one of the main harmonic source. The single-phase four-quadrant rectifier of traction converter outputs with a second pulsation, DC link voltage which contains ripple get into control link, a given modulation wave obtained by calculating contains a low-order harmonics, so as the current wave of the rectifier AC side. By using the notch filter to filter the second pulsation, the grid-side harmonics can be reduced effectivery. And in the ＂Belt and Road＂ policies, to achieve railway interconnection between countries, the converter is needed to optimize for different power supply frequency, and the converter is needed to redesign to reduce the harmonics. In this paper, how the second pulsation effects the grid-side current harmonic and how the traditional notch filter works are analysised, and a dynamic notch filter is proposed with a feed- forward, according to the traction power supply grid, it can quickly adjust the frequency, and its feasibility is shown through Matlab simulation and dSPACE experiment results.