Research on a Dynamic Notch Filter Applied to Traction Converters

doi:10.11985/2016.08.001

Abstract

Abstract:

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.

Key words: Traction converter, the second harmonic, harmonic elimination, notch filter, feedforward

CLC Number:

U264.3

Zhenpeng Xiao,Tefang Chen,Shu Chen,Guixin Zhang,Chaoqun Xiang. Research on a Dynamic Notch Filter Applied to Traction Converters[J]. Journal of Electrical Engineering, 2016, 11(8): 1-8.

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参数	数值
额定输入电压/V	AC 1 450
中间直流电压/V	DC 2 800
中间支撑电容/mF	4
网侧电感/mH	2.5
负载电流/A	350
输入电流/A	684

谐波次数	50Hz		60Hz
谐波次数	双T陷波器	动态陷波器	双T陷波器	动态陷波器
3次谐波(%)	2.56	2.39	2.61	2.43
5次谐波(%)	1.88	1.48	2.55	2.39
7次谐波(%)	1.98	1.90	4.20	4.02

参数	参数值
调压器输入	AC 220V
调压器输出	AC 50V
网侧电感L_N	15mH/10A
直流支撑电容C_d	1 500μF/450V
电阻负载	50Ω/2 000W

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