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Systematic design of high performance hybrid cascade multilevel inverters with active voltage balance and minimum switching losses

Author(s):

S. Mariéthoz
Conference/Journal:

vol. AUT12-02
Abstract:

Hybrid cascade multilevel inverters combine semiconductor devices of different voltage ratings and technologies, which theoretically allows obtaining high efficiency. The bottleneck of these topologies is, however, the need for isolated supplies for the cells. The paper focuses on the design and control of high-resolution, high efficiency multilevel inverters with simplified DC power supplies. It introduces several rules for systematically designing the DC-voltages of the cells, for which all unsupplied capacitor voltages can be regulated. Six classes of inverters are obtained covering single- and three-phase, stair case and pulse-width modulated inverters. New configurations of hybrid cascade multilevel inverters are obtained for each class. A double modulation strategy with two different frequencies is proposed that allows reducing switching losses of pulse width modulated inverters. Decoupled mechanisms are proposed for the total and internal energy balances. It is shown how to make the design robust by taking into account conversion losses and large DC-voltage imbalances in the design and control. An analysis of the maximum voltage utilization and efficiency of the proposed configurations is carried out. The effectiveness of the proposed concepts are validated experimentally for two of the proposed topologies.

Year:

2012
Type of Publication:

(04)Technical Report
Supervisor:

S. Mariéthoz

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% Autogenerated BibTeX entry
@TechReport { Xxx:2012:IFA_4048,
    author={S. Mari{\'e}thoz},
    title={{Systematic design of high performance hybrid cascade
	  multilevel inverters with active voltage balance and
	  minimum switching losses}},
    institution={},
    year={2012},
    number={},
    address={},
    month=apr,
    url={http://control.ee.ethz.ch/index.cgi?page=publications;action=details;id=4048}
}
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