利用随机中心位置调制抑制逆变器的电磁干扰

针对电动汽车逆变器所产生的电磁干扰问题,提出了一种利用随机中心位置调制抑制逆变器的电磁干扰方法。该方法在七段对称法调制的基础上,将脉冲的中心位置在调制周期中左右移动,在一定的范围内随机地改变脉冲作用时刻,从而实现随机中心位置调制;利用Matlab/Simulink搭建了永磁同步电动机矢量控制仿真模型。仿真结果表明,与单一的七段对称法相比,随机中心位置调制可以有效地减小载波频率及载波倍次频率处的谐波幅值,从而减少逆变器对外的电磁辐射干扰。

Suppressing Electromagnetic Interference of the Inverter by Random Center Position Modulation

Aiming at electromagnetic interference generated by the inverter of the electric vehicle, proposed a random center position modulation method. On the basis of the original seven segment symmetry modulation, the method moves around the center position of the pulse in the modulation cycle and changes the pulse time randomly within a certain range in order to achieve random center location modulation. With Matlab/Simulink established a simulation model for vector control of permanent magnet synchronous motor. The simulation results show that comparing with the conventional seven segments symmetrical modulation, random center position modulation can reduce the carrier frequency and carrier-fold harmonic amplitude of frequency, there by reducing the inverter external electromagnetic radiation interference.