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A novel three-phase PWM rectifier-inverter topology for UPS applications is proposed in this paper. The topology uses only nine IGBT devices for AC/AC conversion through a quasi DC link circuit. This converter topology features sinusoidal inputs and outputs, unity input power factor, and more importantly, low manufacturing cost. The operating principle of the converter is elaborated and a novel modulation...
For medium voltage high power grid-interfacing converters, the operating switching frequency is often around several hundred Hz to reduce the switching power losses. Therefore, to eliminate the even order harmonics and non-characteristic harmonics and to minimize the beat phenomenon, synchronous PWM techniques are desired for the high power low-switching converters. In this paper, a direct PWM synchronization...
An inductor-capacitor (LC) filter is normally required at the input of a pulse-width modulation (PWM) current source rectifier (CSR), to assist in the commutation of switching devices and to mitigate line current harmonics. To dampen the LC resonance introduced by the input filter, an effective damping method is proposed in this paper by using a hybrid combination of a virtual harmonic resistive damper...
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