METHOD AND SYSTEM FOR OPERATING A MULTILEVEL INVERTER

摘要

A controller for operating a multilevel electric power inverter circuit. The controller is configured to generate and apply to the plurality of switching elements switch signal waveforms, the switch signal waveforms comprising a first control signal for causing an energy storage device to be series connected with a direct current source and a load or an alternating current source and charged to a predetermined value proportional to a voltage of the direct current source, and a second control signal for causing the energy storage device to be disconnected from the direct current source and series connected with the load or the alternating current source, thereby causing the energy storage device to be discharged.

主权项

1. A controller for a multilevel electric power inverter circuit, the controller comprising:
a modulation circuit configured for generating a plurality of command signals, the command signals indicative of switching states for a plurality of switching elements in the inverter circuit to obtain a given voltage level at an output of the inverter circuit; and a voltage balancing circuit connected to the modulation circuit and connectable to the plurality of switching elements, and configured to generate, as a function of the command signals, switch signal waveforms as half-cycles of an alternating current waveform having alternating periods of positive and negative, for selective opening and closing of the plurality of switching elements to obtain the given voltage level.