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Modular power converters are expected to play a major
role in medium and high voltage/power applications. Normally, each module
processes the same amount of power, however this does not take into
consideration that different modules can have a different remaining useful
lifetime. This paper proposes the concept of power routing for cascaded
H-bridge (CHB) converters, with the purpose of delaying the failure of the system.
A third-harmonic injection into the duty cycles allows extending the imbalance
capability of the structure, keeping the CHB operational even if some power
paths are completely unloaded. Analytic investigation in conjunction with
simulation and experimental measurements demonstrate the power routing by means
of the proposed method.
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