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A high performance modular three-phase utility-interactive converter is designed and implemented in this paper. This converter has three operation modes: grid-connection inverter mode, stand-alone inverter mode and rectifier mode. Control principles and modes of every mode are analyzed in detail and the modular design method is adopted. A simple but valid control strategy is proposed. Finally a 10...
This paper introduces the model of PWM rectifier by regarding the AC side as a virtual motor, and presents the estimation method of AC voltage, virtual flux and instantaneous active/reactive power. It is now well known that the switching table is the most important for PWM rectifier. The traditional switching table in power loop of DPC system controls instantaneous active and inactive power, leading...
In this paper, a comparative study of modified phase-angle, extinction-angle, and pulse width modulation control techniques for the purpose of power factor improvement of single-phase AC-AC voltage regulators have been illustrated as applied to a single-phase AC voltage converter by an example of the widely used single-phase induction motor as a dynamic load. Observations on power factor, displacement...
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