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This paper explores control methods for the Z-source inverter and their relationships of voltage boost versus modulation index. A maximum boost control is presented to produce the maximum voltage boost (or voltage gain) under a given modulation index. The control method, relationships of voltage gain versus modulation index, and voltage stress versus voltage gain are analyzed in detail and verified by simulation and experiment.

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Abslract: I n this paper, three different inverters: traditional PWM inverter, dc/dc boosted PWM inverter, and Zsource inverter for fuel cell vehicles were investigated. Total switching device power o f each of these inverters was calculated. For purposes of comparison, nu example of the total switching device power, requirement of passive components, efficiency, and the constant power speed ratio of the different inverters powered by the same fuel cell and loaded by the same motor were conducted. This comparison shows that the Zsource inverter is very promising for fuel cell vehicles. 0-7803-6538-

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