PT Unknown AU Braeckle, D Himmelmann, P Hiller, M Nielebock, S TI Comparison of Modular Multilevel Topologies for AC to AC Applications SE 9th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2018; Charlotte; United States; 25 June 2018 through 28 June 2018 PY 2018 BP Art. EP Nr.. DI 10.1109/PEDG.2018.8447711 LA english ER