电动汽车直流母线干扰信号频域分析

Frequency Domain Analysis of Interference Signal on Direct Current Bus of Electric Vehicles

直流母线易受接入的用电设备影响而造成母线电压的波动,因此有必要对其所受的干扰进行分析。采集不同工况下的正极直流母线,对底盘电压和电池端电压信号并对相应的噪声信号进行频谱分析,确定母线电压干扰信号的类型和分布。实验结果和分析表明,逆变器和电机是母线电压的主要干扰源,接入的其他用电设备构成附加干扰。它们在直流母线上叠加相应的噪声信号可为母线电压的监测、分析和干扰信号处理提供参考。

Direct current （DC） bus is greatly affected by the electrical equipment connected to it, which contributes to fluctuation of DC bus voltage, thus it is necessary to analysis the interference signal on DC bus. By sampling the voltage of positive DC-link bus-to-the chassis and battery on different conditions and conducting the spectrum analysis of corresponding noise signal to determine the type and distribution of interference signal. The results indicate that inverter and motor as the main interference source and other electrical equipment for the additional ones all superpose corresponding noise signal on DC bus. This study can provide a reference for the monitoring, analysis and processing of interference signal on bus voltage.