Abstract：The main circuit topology, PWM technology, and the security operation mechanism are the key problems for the research of the high power and voltage three-level neutral point clamp inverter. In order to develop the three-level NPC technology, the main circuit improvement and PWM technology perfection need to be paid attention. At the same time the theoretical innovation through the multi-disciplinary overlapping (such as power electronics, intelligent technology) should be adopted. Combined with existing achievements, this paper carries out research in the aspects of new main circuit topology design, PWM security and stability improvement. The purpose of this paper is to provide a new way to solve these problems. The results lay a theoretical and application basement for improving the inverter capacity, control performance, and system security and stability.
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2012, Vol. 27 
