Hybrid Modulated Inverter with Very-low-distorted Output Voltage Waveforms

本研究的目的是开发一种具有极低失真输出电压波形的单相和三相混合调制逆变器。结果表明：(1)混合调制单相逆变器。成功研制了一种具有低失真和低dv/dt特性的新型混合调制逆变器。分析了逆变器的输出电压波形。结果表明，该系统的输出电压失真降低到传统系统的50%以下。所开发的逆变器已成功应用于小型风扇电机转速的1/f波动控制，产生类似于自然柔和风的舒适风。(2)混合调制三相逆变器。分析了混合调制输出电压的多相交错脉宽调制逆变器系统的输出电压波形。用模态方法在时域上讨论了混合调制逆变器馈电三相异步电动机的特性。结果表明，该混合调制逆变器系统的输出电压波形畸变比传统系统小。然而，电磁干扰（EMI）问题尚未得到解决。

The purpose of this study is that we develop a single-phase, and a three-phase hybrid-modulated inverter with very low-distorted output voltage waveforms.The results are as follows:(1) A hybrid-modulated single-phase inverter. A novel hybrid-modulated inverter which has the feature of low distortion and low dv/dt has been successfully developed. The output voltage waveforms of the inverter was analyzed. It is found that the output voltage distortion decrease to less than fifty percent of that of conventional systems. The inverter developed was successfully applied to the 1/f fluctuation control of a small fan motor speeds which produces a comfortable wind similar to a natural, gentle wind.(2) A hybrid-modulated three-phase inverter. The output voltage waveforms of a multiple phase-staggered pulse width modulated inverter system which gives hybrid-modulated output voltage were analyzed. The characteristics of a three-phase induction motor fed by a hybrid-modulated inverter were discussed in time domain by modal approach.It is concluded that the proposed hybrid-modulated inverter system produces less distorted output voltage waveforms than conventional systems. The problem of electromagnetic interference(EMI), however, has not been solved.