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交直交动车组在电气化铁道中的大量采用,使得牵引供电系统中的谐波特性发生变化。提出高铁牵引供电线路的分布参数模型来代替常见的集总参数模型,从而在Matlab/Simulink仿真环境下进行更为准确的模型建立,再用优化的分段函数频谱分析法来对CRH2车型在高铁牵引线路中的具体运行状况进行谐波分析。由于信号离散化后会丢失一定量的信息,将所有离散信息分成N段后先分别积分再求和,减少丢失的信息量以接近原信息。在使用优化方法对实测值进行分析后,与先给出的和实测结果接近的拟合函数进行比较。计算表明,分段函数频谱分析法较传统方法对可被拟合的函数具有更好的优化作用,当谐波含量加大时,对混叠误差具有突出的抑制作用。
The large number of AC and DC trains used in the electrified railway make the harmonic characteristics of traction power supply system change. The distribution parameter model of high-speed rail traction power supply line is proposed to replace the common lumped parameter model to establish a more accurate model under the Matlab / Simulink simulation environment, and then the optimal segment function spectrum analysis method is used to test the CRH2 model in high- Harmonic analysis of the specific operating conditions in the traction circuit. Because the signal is discretized, a certain amount of information will be lost. After all the discrete information is divided into N segments, it will be integrated and then summed respectively to reduce the amount of information lost to approximate the original information. After using the optimization method to analyze the measured values, we compare with the fitting function that is given first and the measured result is close. The calculation shows that the segmentation function spectrum analysis method has a better optimization function than the traditional method, and when the harmonic content is increased, it has a prominent inhibitory effect on the aliasing error.