在电力系统中，变压器是实现电压变换、电能传输和分配的关键设备。
Transformer is the key instrument for voltage converting, power transmission and distribution in power system.
最后，本文还提出了另外几种零电压零电流开关PWM推挽三电平直流变换器。
Several zero voltage and zero current switching PWM push pull three level converters are proposed.
研究了主变换器的单独运行及其输出电压的控制。
The separate operation of the main converter and the output voltage control are studied.
研究了主变换器的单独运行及其输出电压的控制。
The separate operation of the main converter and the output voltage control are studied.
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