Motor Drives and Inverters
Technical Lecture Session
Motor Drives: Topology and Control Strategies
Power Converters, Topological Transformation, Duality, Isomorphism, Graph theory
In this paper, the dual principles and isomorphic principles are utilized together as powerful tools to reveal the circuit-level fundamental relationships of power converters. The topology cycling phenomenon of dual and isomorphic converters is discovered and investigated in the power electronics field for the first time. It describes that a power converter can be transformed into itself through two or four steps of topological transformations with 1-to-1 mapping (i.e. dual and isomorphic). Such a universal phenomenon can facilitate the generalization of existent knowledge of power converters and thus, avoid duplicate research work. Extensive examples of power converters (e.g. planar/non-planar, voltage-source/current-source, single/multi-phase, single/multiple converter systems) are reviewed in this paper to show how the existent circuits as well as their operation and modulation strategies can be transformed from one converter to other converters, which can greatly facilitate the topology derivation, analysis, and design in a general way.