基于AT波形重构方法的逆变技术研究

Study on the Inverter’s Waveform Reconstruction with An Auxiliary Transformer

在中高压变频驱动系统中,通常采用多重化和多电平逆变技术,以降低逆变电压的谐波。本文提出了另外一种降低谐波的逆变技术,构成了一种基于波形重构的具有辅助变压器的逆变器拓扑。在介绍其基本工作原理的基础上,分析了辅助变压器变比和逆变器导电制与输出电压总谐波畸变率之间的关系,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,对所提出的逆变器采用多重化技术,同样具有较好的性能。

In the medium-high voltage driving systems, the cascade and multi-level inverting techniques are often used to obtain low harmonic output voltages. This paper proposes a different inverter topology based on waveform reconstruction technology with an auxiliary transformer. The relations between the output voltage, conduction mode, and the ratio of the auxiliary transformer are also analyzed. Finally, the proposed inverter is compared with the conventional inverters on the efficiency of DC voltage and the output voltage total harmonic distortion （THD）. The simulation results show that the proposed inverter applied with cascade technology obtains a better effect.