电气化铁路负荷对电子式电能表计量精度影响的研究

Study of Impacts of Electrical Railway Load on Electronic Electric Energy Meter Measurement Accuracy

介绍了在Matlab/Simulink环境中构建电气化铁路的负荷模型,同时建立了时分割乘法器(TDM)电能表以及数字式乘法器电能表模型。通过仿真实验比较可知,调制频率越高则时分割乘法器电能表的计量精度越高,采用高阶Kaiser窗类型的滤波器可提高数字式乘法器电能表计量精度。结果表明,虽然电铁负荷含有大量谐波,负序以及冲击性电流,但只要选取合适的电能表参数就能满足计量所需精度。

Electrical railway load model was built in Matlab/Simulink environment, in the meantime electric energy meter with time dividing multiplier （TDM） and digital multiplier electric energy meter were also built. By comparison of simulation experiment, it was known that high frequency modulation could improve the accuracy of measurement in the TDM system and filters with high-order Kaiser window could affect the accuracy of measurement in the electronic multiplier system. The results show that although there are negative sequences, harmonic current and shocking current in the electrical railway load, the accuracy of the meter can still meet the needs by choosing proper parameters.