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

本研究的目的是研制一种单相和三相混合调制逆变器，其输出电压波形具有极低的失真。研制成功了一种新型的低失真、低dV/dt的混合调制逆变器。对逆变器的输出电压波形进行了分析。结果表明，系统的输出电压失真度降到了常规系统的50%以下。研制的逆变器已成功应用于一台小型风机电机转速的1/f波动控制，可产生与自然微风相似的舒适风力。(2)混合调制三相逆变器。分析了多相错位脉宽调制逆变器系统的输出电压波形。用模态法对混合调制逆变器供电的三相感应电动机的特性进行了分析，结果表明，该混合调制逆变器系统的输出电压波形失真比传统系统小。然而，电磁干扰(EMI)的问题并没有得到解决。

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.