Multilevel converter topologies for medium voltage high power regenerative drive system

高功率中压驱动器是工业运行水泵、风扇、牵引电机等的关键。近年来，随着对能源效率的重视，对具有再生运行能力的高性能驱动器的需求，使电机能够将能量反馈到电网。基于多电平变流器的驱动器具有高电能质量、增强的可靠性等优点，非常适合于高功率中压应用。然而，目前还缺乏允许再生运行和令人满意的低电机速度运行的基于高电平变流器的驱动器。*在该合作研究与开发(CRD)计划中，我们提出了两种适用于中压和大功率驱动应用的多电平转换器拓扑。所提出的拓扑可以工作在7电平甚至更高的输出，并且具有低成本、高可靠性、模块化的特点，以及再生运行和低速运行的能力。该项目的研究成果将及时满足行业对高性能大功率驱动器的需求。

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.************