CAJ | 학술논문

提出了Buck-Boost式三电平单级AC/AC变换器电路拓扑,该变换器适用于高压场合,具有开关管的电压应力低、单级功率变换、变换效率高、三电平波形、实现升降压输出、输出电压THD较小、负载能力强等优点。该变换器的开关管电压应力是两电平的1/2,大大降低了在高压场合对开关管的电压应力要求。同时,研究了适用于该变换器的电压瞬时值反馈控制策略,该策略能够快速响应输入及输出电压的变化;并根据输出电压、电流的极性,分析了该变换器负载时的四种工作模式;以及该三电平变换器在CCM和DCM模式下的输入输出特性和外特性。实验结果充分证实了该变换器的正确性和先进性。
제출료Buck-Boost식삼전평단급AC/AC변환기전로탁복,해변환기괄용우고압장합,구유개관관적전압응력저、단급공솔변환、변환효솔고、삼전평파형、실현승강압수출、수출전압THD교소、부재능력강등우점。해변환기적개관관전압응력시량전평적1/2,대대강저료재고압장합대개관관적전압응력요구。동시,연구료괄용우해변환기적전압순시치반궤공제책략,해책략능구쾌속향응수입급수출전압적변화;병근거수출전압、전류적겁성,분석료해변환기부재시적사충공작모식;이급해삼전평변환기재CCM화DCM모식하적수입수출특성화외특성。실험결과충분증실료해변환기적정학성화선진성。
Buck-Boost three-level（TL）single-stage AC/AC converter circuit topology is proposed in this paper.This converter,which is suitable for high input voltage field,has many advantages such as low voltage stress of the switches,single-stage power conversion,high conversion efficiency,three-level voltage waveform of the inductor for storing energy,low THD of output voltage, strong load adapting ability,et al.The voltage stress of switches of this converter is half of that of two-level converter.So the requirement of the voltage stress of switches can be lowered in high-voltage field.The transient voltage feedback control strategy of the converter is also investigated,which can rapidly respond to the change of the input and the output voltage.According to the polarity of the output voltage and the output current,the converter contains four kinds of operation modes.Each operation mode is equal to a three-level DC/DC Buck-Boost converter.The operation principle of the converter is analyzed in details.The external characteristic of this converter is analyzed in CCM mode and DCM mode.The correction and advance of the kind of converters are verified by experiment.