CAJ | 학술논문

多电平变换技术主要是针对电压型逆变器，随着电力电子技术以及储能技术的发展，电流型多电平逆变器也将得到广泛应用。针对单相直接式电流型多电平拓扑开展研究，该类拓扑结构非常简单，所用开关器件和均流电感的数目非常少，逆变电路的开关器件的频率可以很低。分析了由该类拓扑组成的单相5电平、7电平变流器的工作原理，总结了变流器的拓扑构成规律，建立了单相5电平、7电平变流器的稳态平均模型，研究了它们的开关控制策略，并给出了一种通过调节输出电平宽度来消除低次电流谐波的方法。
다전평변환기술주요시침대전압형역변기，수착전력전자기술이급저능기술적발전，전류형다전평역변기야장득도엄범응용。침대단상직접식전류형다전평탁복개전연구，해류탁복결구비상간단，소용개관기건화균류전감적수목비상소，역변전로적개관기건적빈솔가이흔저。분석료유해류탁복조성적단상5전평、7전평변류기적공작원리，총결료변류기적탁복구성규률，건립료단상5전평、7전평변류기적은태평균모형，연구료타문적개관공제책략，병급출료일충통과조절수출전평관도래소제저차전류해파적방법。
The multilevel CSI＇s synthesize the staircase current wave from several levels of balanced inductor currents. The structure of the new inverter is very simple. The current balance of sharing inductors can be achieved without close-loop control. A three-phase 6-level inverter and a three-phase 12-level inverter using the new topology are discussed in detail. The waveforms of output current and current-sharing inductors current of the two inverters under capacitive load and inductive load are provided. The proposition is verified by simulation results and experimental results. Compared with traditional multiple CSI＇s, the topologies have many advantages.