A Transformerless Back-To-Back (BTB) System Using Modular Multilevel Cascade Converters For Power Distribution Systems

作者：Khamphakdi Pracha^*; Sekiguchi Kei; Hagiwara Makoto; Akagi Hirofumi

来源：IEEE Transactions on Power Electronics, 2015, 30(4): 1866-1875.

DOI：10.1109/TPEL.2014.2327986

• Back-to-back (BTB) systems
• distributed power generators
• grid-connected converters
• modular multilevel cascade converters (MMCCs)

This paper presents an intensive discussion on a transformerless back-to-back (BTB) system using modular multilevel cascade converters based on double-star chopper cells (MMCC-DSCC). It is expected to be applied to a power distribution system with many distributed power generators. This paper designs, constructs, and tests a three-phase 200-V, 10-kW DSCC-based BTB system installed on a 200-V, 40-kW power distribution simulator consisting of two radial feeders. Experimental results show that the BTB system can mitigate power-flow imbalance between the two feeders. Moreover, the zero-sequence current circulating between the two feeders can be suppressed to be as small as 10 mA (0.02%) in rms by connecting a common-mode choke to the common dc link of the BTB system.

• 出版日期2015-4