The Analysis and Control of Zero-Sequence Components in a Transformerless Back-To-Back (BTB) System Using Modular Multilevel Cascade Converters for Power Distribution Systems

  • Pracha Khamphakdi Ubon Ratchathani University

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Abstract

This paper provides an intensive discussion on analysis and simulation of a back-to-back (BTB) system based on double-star chopper cells (MMCCs-DSCCs). It is installed between two 6.6-kV power distribution feeders. It is also referred to as the so-called “loop power flow controller.” A three-phase 200-V, 10-kW, 50-Hz  BTB transformerless system is simulated to verify its operating principles, modelling, and performance of zero-sequence current control using combination between a simple PI controller and a common-mode choke. The simulation results show that the zero-sequence current circulating between the two feeders can be suppressed as small as 10 mA (0.03%) in rms, which is within acceptable value and small enough to negligible.

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Author Biography
Pracha Khamphakdi

Department of Electrical and Electronic Engineering, Faculty of Engineering, Ubon Ratchathani University, Thailand

Published
Vol 21 No 6, Oct 31, 2017
How to Cite
P. Khamphakdi, “The Analysis and Control of Zero-Sequence Components in a Transformerless Back-To-Back (BTB) System Using Modular Multilevel Cascade Converters for Power Distribution Systems”, Engineering Journal (Eng. J.), vol. 21, no. 6, pp. 81-89, Oct. 2017.

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