电气化铁路混合宽频滤波器研究

为解决电气化铁路中交-直型和交-直-交型电力机车混跑产生的3~100次宽频谐波问题,提出采用由无源部分和有源部分构成的混合宽频滤波器(Hybrid Wideband-harmonics Filter,HWF)。通过对HWF拓扑结构、滤波原理及滤波特性、有源部分承受电压情况、谐波补偿系数对HWF补偿特性的影响和稳定性进行分析,研究HWF控制策略,并进行仿真和试验验证。结果表明:HWF对宽频谐波具有良好的滤波效果,能够很好地抑制无源部分阻抗与电网阻抗之间的谐振;基波谐振电路能减小有源部分的基波电压,使其适用于中高压电力系统;谐波补偿系数取值越大,HWF对谐波的抑制能力越强。仿真和试验结果验证了HWF的有效性。

Research on Hybrid Wideband-Harmonics Filter for Electrified Railway

In order to solve the problem of wideband harmonics of 3~100 orders caused by the mixed running of AC-DC and AC-DC-AC electric locomotives in electrified railway,a hybrid wideband-harmonics filter(HWF)composed of a passive part and an active part was proposed.Based on the analysis of HWF topology,filtering principle and filtering characteristics,the active part withstand voltage of HWF,the influence of harmonic compensation coefficient on HWF compensation characteristics and the stability,the HWF control strategy was studied,and simulation and experimental verification were carried out.Results show that HWF has a good filtering effect on wideband harmonics,and it can well suppress the resonance between the impedance of the passive part and the impedance of the power grid.The fundamental resonance circuit can reduce the fundamental voltage of the active part and make it applicable for medium and high voltage power systems.The larger the value of the harmonic compensation coefficient,the stronger the ability of HWF to suppress harmonics.The effectiveness of HWF is verified by means of simulation and experimental results.