ABSTRACT
This chapter presents a hybrid modulation strategy for the cascaded cell multilevel converter (CCMC). The strategy allows traveling along all the states of the converter maintaining the voltage balance on all the capacitors. A further analysis of the low-frequency spectrum of the DC bus current shows the charge balance at steady state for different load conditions. The differential mode current defines the design of the DC bus capacitors and the related energy storage. The differential component of the current is now analyzed with the current through one capacitor. These are the most popular: diode-clamped multilevel converter (DCMC), flying capicator multilevel converter (FCMC), CCMC, and also the hybrid topology presented in this chapter, the CAMC. The DCMC and the CAMC present the lowest energy index; they are followed by the FCMC, and the CCMC presents a much higher index. The analysis showed that there exist two different currents in the DC bus.
