CAJ | 학술논문

分析了电力电子变压器(power electronic transformer， PET)的国内外研究现状，以及面向中高压电网的已有 PET拓扑的特点。在此基础上，基于模块化多电平变流器(modular multilevel converter，MMC)，提出了面向中高压智能配电网PET的一种新型拓扑。与传统的PET电路拓扑相比，新型拓扑的优势在于其可以减少电力电子开关器件的数量；更重要的是，可以显著减少高频变压器的数量，具有更好的体积及重量优势。同时，分析了该拓扑 PET 的工作机制及不同电能转换环节的控制策略设计方法。10 kV/380 V配电网用PET样机上的仿真及试验结果表明了所提拓扑及其控制策略的可行性。
분석료전력전자변압기(power electronic transformer， PET)적국내외연구현상，이급면향중고압전망적이유 PET탁복적특점。재차기출상，기우모괴화다전평변류기(modular multilevel converter，MMC)，제출료면향중고압지능배전망PET적일충신형탁복。여전통적PET전로탁복상비，신형탁복적우세재우기가이감소전력전자개관기건적수량；경중요적시，가이현저감소고빈변압기적수량，구유경호적체적급중량우세。동시，분석료해탁복 PET 적공작궤제급불동전능전환배절적공제책략설계방법。10 kV/380 V배전망용PET양궤상적방진급시험결과표명료소제탁복급기공제책략적가행성。
The progress of the research on power electronic transformer (PET) home and abroad is reviewed and the features of the existing PET circuit topologies oriented to medium-and high-voltage power girds are analyzed. Based on these analyses and taking advantage of the modular multilevel converter (MMC), a new type of PET topology oriented to medium-and high-voltage smart distribution grid is proposed. Compared with the existing topologies, the proposed circuit can reduce the number of the power switches. What is more important, the proposed topology can reduce the number of the high-frequency transformers substantially. Thereby, the presented PET topology is superior to the existing circuits in terms of volume and weight. Meanwhile, the operation mechanism of the proposed PET and the control strategy design methods for the different electric energy conversion stages are presented. Simulation and experimental results on a PET prototype oriented to 10kV/380V distribution grid show that the proposed circuit topology and its control strategy are feasible and effective.