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A system is described where a floating H-bridge converter is located in each phase between the utility grid and an induction machine. These converters are used to adjust the phase and magnitude of the motor voltage relative to the utility grid by injecting a series voltage in each phase. A control strategy is described where: the phase and magnitude of the injected voltage is controlled; the motor...
This paper presents the results of a study to investigate the use of IGBT hard-switched power electronics to soft start a squirrel cage induction motor when operating from the utility grid. The paper presents the theory necessary to understand how three floating capacitor H-bridge converters can be used to control the motor voltage during starting and hence limit the motor starting current to the...
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