基于AT波形重构方法的逆变技术研究

Study on the Inverter's Waveform Restructure Method with an Auxiliary Transformer

在中高压变频驱动系统中,通常采用多电平逆变技术,以降低逆变电压的谐波。本文采用波形重构方法,在介绍其基本工作原理的基础上,详细分析了此逆变器的导电制,并给出了输出电压总谐波畸变率与其参数的关系,并将该逆变器与几种常见的逆变器从直流电源利用率、总谐波畸变率等方面进行了比较分析。仿真实验研究结果表明,采用开绕组异步电机实现的二重化,同样具有较好的性能。

In the medium-high voltage, variable frequency driving system, multi-level inverting technology is widely used to obtain low harmonic output voltages. Waveform restructure method is applied, and the conduction style is analyzed in detail based on the presentation of the circuit＇s principle. Then, the relations between output voltage and parameters presents,and there is a comparison with the conventional inverters on the efficiency of DC voltage and the output voltage total harmonic distortion （THD）. The simulation results show that the dual inverter fed open-end windings induction motor obtains a better effect.