Browsing by Author "Flores Lara, Patricio Armando"
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- ItemCompensador multinivel activo, reactivo y armónico respaldado por paneles fotovoltaicos.(2008) Flores Lara, Patricio Armando; Dixon Rojas, Juan; Pontificia Universidad Católica de Chile. Escuela de IngenieríaEl presente trabajo de Tesis describe la implementación de un filtro activo y compensador estático de reactivos con capacidad de inyección de potencia activa, utilizando un inversor multietapa de 27 niveles. Cada fase del inversor está compuesta por tres puentes \201CH\201D, todos los cuales están conectados a la misma barra DC, mientras que sus salidas están conectadas a transformadores escalados en potencias de tres. El filtro puede compensar corrientes de carga con alto contenido armónico y bajo factor de potencia, lo que resulta en entrega de corrientes sinusoidales desde la red. Para tomar mayor ventaja de este compensador, la barra DC, en vez de un condensador, utiliza un banco de baterías, el que es cargado a través de un arreglo fotovoltaico conectado a las baterías a través de un MPPT (Maximum Power Point Tracker). Esta topología combinada hace posible la producción de potencia activa, e incluso la alimentación de las cargas durante apagones prolongados. Se muestran resultados de simulaciones de esta aplicación, así como algunos experimentos realizados con un prototipo de inversor de 3 kVA.
- ItemFault Tolerant Reconfiguration System for Asymmetric Multilevel Converters Using Bi-Directional Power Switches(IEEE, 2007) Barriuso Villamar, Pablo Andrés; Dixon Rojas, Juan; Flores Lara, Patricio Armando; Moran, LuisAsymmetric multilevel converters can optimise the number of levels by using H bridges scaled in power of three. The shortcoming of this topology is that the H bridges are not interchangeable and then, under certain faulty conditions, the converter cannot operate. A reconfiguration system based on bi-directional electronic valves has been designed for a 3-phase cascaded H-bridges. Once a fault is detected in any of the IGBTs of any H- bridge, the control is capable to reconfigure the hardware at the faulty phase by means of eliminating the damaged bridge. If the faulty bridge is not the smallest one, then the bi-directional-valve system reconfigure the faulty phase to keep the higher power bridges in operation. In this way, that phase can continue working at the same voltage level by adjusting its gating signals. Some simulations and experiments with a 27-level inverter, to show the operation of the system under a faulty condition, are displayed.
- ItemFault-Tolerant Reconfiguration System for Asymmetric Multilevel Converters Using Bidirectional Power Switches(IEEE, 2009) Barriuso, Pablo; Dixon Rojas, Juan, 1948-; Flores Lara, Patricio Armando; Moran, LuisAsymmetric multilevel converters can optimize the number of levels by using H-bridges scaled in the power of three. The shortcoming of this topology is that the H-bridges are not interchangeable, and then, under certain faulty conditions, the converter cannot operate. A reconfiguration system based on bidirectional electronic valves has been designed for three-phase cascaded H-bridge inverters. Once a fault is detected in any of the insulated gate bipolar transistors of any H-bridge, the control is capable to reconfigure the hardware keeping the higher power bridges in operation. In this way, the faulty phase can continue working at the same voltage level by adjusting its gating signals. Some simulations and experiments with a 27-level inverter, to show the operation of the system under a faulty condition, are displayed.
- ItemStatic 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, LuisAn 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
- ItemStatic 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, LuisAn 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.