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Capacitor balance issues of the diode-clamped multilevel inverter operated in a quasi two-state mode

This paper represents speculative research into high-voltage switching by hybridising series-connection and multi-level techniques. When used in this mode the capacitor charging problem of the diode clamped inverter is eliminated through a novel charge balancing technique, and the power devices may be switched at their optimum speed without incurring voltage sharing problems or impressing excessive output dv/dt. Techniques developed during this research have fed into simulations and applied research on HVDC systems, collaborative research with RTE  France [olivier.despouys@rte-france.com] and two research contracts with Mitsubishi [£245k, 2013-2014 and £45k, 2013, Steve.Langdon@crd.meuk.mee.com].