Multilevel converter topologies for medium voltage high power regenerative drive system

高功率中压驱动器是工业运行泵、风扇、牵引电机等的关键。随着近年来对能源效率的重视，需要具有再生运行能力的高性能驱动器，使电机能够将能量反馈到电网。基于多电平转换器的驱动器是高功率中压应用的非常好的候选者，具有诸如高功率质量、增强的可靠性等优点。然而，缺乏允许再生操作和令人满意的低电机速度操作的基于高电平转换器的驱动器。在这个合作研究与发展（CRD）计划，我们提出了两个多电平变换器拓扑结构的中压和大功率驱动应用。该拓扑结构可实现7电平甚至更高输出，具有低成本、高可靠性、模块化等特点，并可实现再生和低速运行。该计划的研究成果将及时满足高性能大功率驱动器的工业需求。

High power medium voltage drives are key for industries to operate pumps, fans, traction motors, etc. With the emphasis on energy efficiency in recent years, there is a demand of high performance drives with regenerative operation capability that allow motors to feed energy back to the power grid. Multilevel converter based drives are very good candidates for high power medium voltage applications with advantages such as high power quality, enhanced reliability, etc. However, there is a lack of high-level converter based drives that allow regenerative operation and satisfactory low motor speed operation. In this Collaborative Research and Development (CRD) program, we proposed two multilevel converter topologies for medium voltage and high power drive applications. The proposed topologies could operate at 7-level or even higher output, and have low costs, high reliability, modular features, as well as the capability of regenerative operation and low-speed operation. Research outcome in this program will timely address the industrial need of high performance high power drives.