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中文摘要：
在SPWM逆变电源输出电压中含有丰富的高频谐波成分,高频谐波在用电设备中引起严重的电磁干扰问题,降低了系统运行的可靠性。通过对SPWM逆变电源的输出谐波分析,提出了一种采用随机调制进行谐波抑制的方法。该方法能使逆变电源的输出电压频谱连续分布而不影响基波分量,使逆变电源的输出谐波能量分布更加均匀,从而降低输出谐波的峰值幅度,减小设备所产生的电磁干扰。通过Simulink软件仿真和实验测试,表明采用随机调制后SPWM逆变电源输出谐波峰值幅度降低了约10dB。
英文摘要：
In the sinusoidal pulse width modulation（SPWM） inverters,the output voltage contains lots of high frequency harmonics.These harmonics may bring about serious electromagnetic interface problem and reduce the reliability of the system.According to output harmonic analysis of the conventional SPWM inverter,this paper proposes a harmonic suppression method adopted random frequency modulation in the SPWM inverter.This method can make the harmonic spectrum of inverter output voltage be continuously distributes without affecting the fundamental frequency component,and thus the harmonic energy of inverter output can distribute more equably.By adopted this method,the peak value of output voltage harmonic spectrum decreased and electromagnetic interface reduced.Based on the theoretical analysis and simulation,a 1 kW experimental prototype is designed.Comparative test shows that the peak value of harmonic in the SPWM inverter adopted our proposed method is reduced about 10dB than the conventional one.
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