Zero-Voltage Ride-Through Capability of a Transformerless Back-To-Back System Using Modular Multilevel Cascade Converters for Power Distribution Systems


This paper focuses on the zero-voltage ride-through (ZVRT) capability of a transformerless back-to-back (BTB) system intended for installation on a power distribution system with many distributed power generators. The BTB system consists of 2 modular multilevel cascade converters primarily based on double-star chopper cells (MMCC-DSCC) and their ac sides are connected to a common ac mains via ac-link inductors. This paper provides an experimental discussion on the DSCC-based BTB system underneath voltage sags by using a three-section two hundred-V ten-kW downscaled system. Experimental results show that the BTB system is supplied with ZVRT capability without inflicting any overvoltage and/or overcurrent even underneath the foremost severe voltage sags.

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