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A method for reducing the capacitor size used in single phase floating capacitor voltage source converter modules is presented. A Transformer Coupled Asymmetrical half-Bridge (TCAB) is used to exchange energy between the capacitor regulated dc sources of the main power converter modules, without using separate power sources. This energy exchange (bidirectional) compensates for naturally occurring...
A methodology is described to conservatively predict the behavior of DC capacitor voltage for floating capacitor H-bridge converters, which are located in each phase between the utility grid and a squirrel cage induction motor. Under the proposed methodology, an algorithm is developed to predict the DC voltage level before motor starting. In this way, DC capacitor voltage overshoot problem can be...
A non-dissipative system using a system of Transformer Coupled Asymmetrical Half-Bridge (TCAB) power converters is presented for voltage balancing of floating capacitor converter modules. A sample system that benefits from the voltage balancing network is considered that uses single phase El-bridge converters connected to a three-phase grid: smaller dc link capacitors can be used with a reduced low...
A system is described whereby floating capacitor H-bridge converters are located in each phase between the utility grid and a squirrel cage induction motor. Injecting a series voltage in each phase, the power electronics can be used to control the motor voltage during starting and hence limit the motor starting current to the desired level. The motor voltage can also be used under steady-state operation...
A non-dissipative system using Transformer Coupled Asymmetrical Half-Bridge (TCAB) power converters is presented for voltage balancing of floating capacitor converter modules. A sample system that benefits from the voltage balancing network is considered that uses single phase H-bridge converters connected to a three-phase grid: smaller dc link capacitors can be used with a reduced low frequency voltage...
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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