该文检测器件集射极电压确定输出电流方向，并据此实现四步换流。
In this design, the collector-to-emitter voltage is sensed to determine the directions of the output currents for the 4-step commutation strategy.
实验结果表明本实验装置系统能成功实现对输出电压和频率进行调节，进一步验证了四步换流技术的可行性。
The results of the experiment successfully show that it can realize the modulation of the frequency of the output voltage. meanwhile, it validates the feasibility of four-step commutation strategy.
主电路采用反向串联的双向IGBT开关，用可编程逻辑元件实现四步切换，以保证安全换流。
To guarantee safe commutation, a four stepped switching strategy is realized by using programmable logic devices.
主电路采用反向串联的双向IGBT开关，用可编程逻辑元件实现四步切换，以保证安全换流。
To guarantee safe commutation, a four stepped switching strategy is realized by using programmable logic devices.
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