一种新颖的高频环节DC/AC变换器的控制方法研究

Research on a Novel Control Method of a HF Link DC/AC Converter

在简要论述了具有高频环节的DC/AC变换器特点基础上 ,提出了一种基于移相控制思想的控制方法 ,该方法可以使交 -交变频器的所有开关都在零电压条件下开通和关断 ,而且可以安全地重叠换相 ,从而有利于高频变压器漏感中储能放电。同时也提出将用于通用型直流电压源逆变器的PWM波生成方法 ,经过同步处理后 ,可以应用到该交 -交变频器中。本文以空间电压矢量生成软化PWM波为例 ,进行了输出电压的谐波分析 ,并且针对三相感应电动机负载 ,进行了实验研究 。

The characteristics of a high frequency(HF)link DC/AC convertet are discussed,and a control method based on phase shift control is proposed,all switches in the cycloconverter are turned on and off in a zero voltage condition by means of the method,and commutation overlap of the switches at the same arm is safe,so that the stored energy in the leakage inductance of HF transformer is released.Meanwhile,the PWM generated methods of a universal DC voltage source inverter are applied to the cycloconverter after the synchronous process.Take the softed PWM waves generated by the space voltage vector as an example,the harmonic analysis of output voltage is Conducteel.As for three phase induction motor,an experiment is carried out and its results verify the control methods mentioned above are right.