Browsing by Author "Carmi, Rodrigo"

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    Static Var Compensator and Active Power Filter With Power Injection Capability, Using 27-Level Inverters and Photovoltaic Cells
    (IEEE, 2009) Flores Lara, Patricio Armando; Dixon Rojas, Juan, 1948-; Ortuzar, Micah; Carmi, Rodrigo; Barriuso, Pablo; Moran, Luis
    An active power filter and static var compensator with active power generation capability has been implemented using a 27-level inverter. Each phase of this inverter is composed of three ldquoHrdquo bridges, all of them connected to the same dc link and their outputs connected through output transformers scaled in the power of three. The filter can compensate load currents with a high harmonic content and a low power factor, resulting in sinusoidal currents from the source. To take advantage of this compensator, the dc link, instead of a capacitor, uses a battery pack, which is charged from a photovoltaic array connected to the batteries through a maximum power point tracker. This combined topology make it possible to produce active power and even to feed the loads during prolonged voltage outages. Simulation results for this application are shown, and some experiments with a 3-kVA device are displayed.
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    Static Var Compensator and Active Power Filter with Power Injection Capability, Using 27-level Inverters and Photovoltaic Cells
    (IEEE, 2006) Flores Lara, Patricio Armando; Dixon Rojas, Juan; Ortuzar Dworsky, Micah Etan; Carmi, Rodrigo; Barriuso Villamar, Pablo Andrés; Moran, Luis
    An active power filter and static VAr compensator with active power generation capability, has been implemented using a 27-level inverter. Each phase of this inverter is composed of three "H" converters, all of them connected to the same dc link and their outputs connected through output transformers scaled in power of three. The filter can compensate load currents with high harmonic content and low power factor, resulting in sinusoidal currents from the source. The dc link is connected to a battery pack, which can be charged from two sources: the ac mains supply and a photovoltaic array connected to the batteries through a MPT (maximum power tracker) converter. These characteristics make it possible to produce active power and to feed the contaminating load during prolonged voltage outages. Simulation results for this application are shown and some experiments with a 3 kVA device are also displayed
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    Voltage source active power filter, based on multi-stage converter and ultracapacitor dc-link
    (IEEE, 2003) Ortúzar Dworsky, Micah Etan; Carmi, Rodrigo; Dixon Rojas, Juan; Morán, Luis
    A multi-stage inverter using three-state converters is being analyzed for active filter and static var compensator applications. Each phase of the converter is composed of four three-state converters, all of them connected to the same dc link and its output connected through output transformers scaled in power of three. The filter can compensate load currents with high harmonic content and low power factor, obtaining sinusoidal currents from the source. A 1F ultracapacitor is used in the dc link, making it possible to obtain a very stable voltage at the dc bus, even with highly contaminated currents. This high capacity also makes it possible to continue feeding the contaminating load during a voltage dip. The capacitor voltage is controlled simply by changing the phase angle of the converter, and thus changing the amount of active current flowing to and from the converter. The control is implemented with a non-linear PI gain and a modulation control to maintain a stable ac voltage during dc voltage drops. The great advantage of this kind of converter is the minimum harmonic distortion obtained. Simulation results for this application are shown and compared with similar results obtained with conventional PWM converters.