Development of Transformerless Multi-Level Medium Voltage Inverters

摘要

Reflecting on Climate Change, environmental impact-reducing technologies, such as energy conservation and reduction of CO_2, are getting worldwide attention. As such, the demands for compact and high-efficiency medium-voltage inverters have increased in the field of power and industrial systems. In particular, there is growing interest in "transformerless" multi-level inverters because they do not require any multi-phase winding transformers on the input source side. Thus far, we invented a unique circuit system suitable for adaptation to medium voltages and succeeded in the development of a transformerless a 4kV prototype whereby verifying its effectiveness. Still more, we recently developed a new circuit system to realize higher voltages and higher performance.