高速动车组中PWM整流器谐波抑制方法研究

Harmonic Suppression Method for Traction System Applied in High-speed Electric Multiple Unit

针对CRH3型动车组牵引系统的主谐波源——单相电压型PWM整流器,采用平均状态等效模型分析其谐波产生机理,在此基础上分别从主电路参数、控制策略两方面研究其谐波抑制方法,并进行相关仿真验证。仿真结果表明,载波移相技术可有效抑制牵引系统输入端电流谐波,配合其它谐波抑制措施可得到较为理想的输入电流波形,降低高速铁路对公共电网的污染。

The harmonic mechanism of single-phase voltage PWM rectifier, the main harmonic source in the traction system of High-speed Electric Multiple Unit （EMU）, is analyzed by adopting an average state equivalent model. On this basis, harmonic suppression method is derived and validated, separately from the two aspects--the main circuit parameters and control strategies. The simulation results show that the carrier phase shifting technology can effectively suppress input the current harmonic of traction system. Cooperated with other harmonic control measures, the carrier phase shifting technology can obtain the ideal input current waveform and reduce high-speed railway pollution on the public power grid.