Transient Behaviors of Multiscale Megawatt Power Electronics Systems—Part II: Design Techniques and Practical Applications

摘要

Megawatt power electronics is an enabling technology for many important industrial applications, including renewable power generation and integration, flexible electric power transmission and distribution, medium-voltage motor drives, and locomotive tractions. Major obstacles still exist for further enhancing its capability and reliability. Part I concluded that the transient behaviors are the key to megawatt power electronics systems designs for superior overall performance, low de-rating requirements and high reliability. This paper builds on the perspective of transient behaviors and presents some key techniques for the design and control of megawatt power electronics converters for high capability and reliability. The techniques include effective utilization of the state-of-art active devices and passive components with optimal power device selections, transient circuit topologies, and energy-balance-based control strategies. Practical application examples are presented to validate the proposed design techniques and to demonstrate their effectiveness.