新型电流型变频调速装置——GTO'S应用之三

研制采用 1支 GTO'S和 6支SCR组成的1种新型变频调速装置。用来控制逆变器中的SCR 换向时刻,并在交流输出端并联3个电容器,其作用是为了提供换向条件,吸收过电压尖峰和减少输出电流的谐波。用变频调速装置拖动2 kW感应电动机,测定电动机的电压和电流波形。通过与普通电流型变频调速装置的电机电压和电流波形相比较,该装置适用于风机或泵类负载的交流调速装置。

A New Current Source Inverter

With the application of one gate turn- off thyristor (GTO'S)and six thyristors, a new current source inverter has been developed. GTO'S is used to control commutation lime of thvristors in the inverter section. Three capacitors are connected to the AC output terminals to provide commutation and to absorb ovcrvaltage spikes and to reduce harmonics in the output current. A 2-kW induction motor is driven by the inverter. The motor valtage and current waveforms are measured and compared with those obtained when the motor is driven by a conventional current source inverter. Therefore, this new current source inverter is very suitable for AC motor variable speed drive in fans or pumps.