Преобразователи частоты с многоуровневым формированием выходного напряжения для электроприводов среднего напряжения

Abstract

The paper presents results of research on various types of multilevel frequency converters and principles of their control. Converters with series-connected low-voltage inverters in output phases are the most suitable for powerful medium voltage drives. Problems of decreasing switching losses and possibilities of reducing the number of elements in power circuits are considered for utilization of inverters with various-voltage power supplies.