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This paper presents the analysis and loss evaluation of the hard-switching and soft-switching inverters in the three-phase uninterrupted power supply (UPS). Both two-level and three-level hard-switching inverters and the chosen soft-switching inverters are designed to evaluate the loss and the efficiency. Tests of the influence of IGBT collector-emitter paralleled capacitor on IGBT turn-off loss through...
A new highly integrated 2times3 phase power electronics with digital controller is designed and implemented based on an existing 4 kW permanent-magnet type bearingless slice motor (BSM) with centrifugal pump developed by Levitronix GmbH Zurich. Firstly, general schematic and functional principle of bearingless slice motor pump system are briefly introduced. Secondly, analytical aspects of the bearingless...
Optimal control methodology is applied to the design of the feedback loops of a multi-inverter uninterruptible power supplies system. The control signals thus obtained will minimize a performance index, which is a function of the output voltage error, the inductor currents of all inverters and the reference signals. This enables the controller to achieve the desired objectives like minimization of...
A novel zero voltage switching SVM (ZVS-SVM) controlled three-phase boost rectifier is proposed. A branch composed of one active switch, one resonant inductor and one clamping capacitor is added to the six-switch boost rectifier. In addition, a novel space vector modulation (ZVS-SVM) for the rectifier is proposed. It can effectively suppress the reverse recovery process of the bridge switches' anti-parallel...
This paper proposes two novel control methods for the transition of the fuel cell inverter from grid-tied mode to off-grid mode. By means of inverter output voltage amplitude regulation or phase regulation, the current through the static transfer switch is forced to decrease to zero. Since the inverter is changed from current control mode to voltage control mode before the static transfer switch is...
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