Browsing by Author "Moran, Luis"

Now showing 1 - 9 of 9
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    A new mathematic algorithm to analyze power distribution systems with active compensation and nonlinear loads
    (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2008) Mahomar, Jose; Moran, Luis; Guzman, Johan; Dixon, Juan
    This paper presents a new procedure to analyze power distribution systems that energize nonlinear loads. The algorithm uses the singular values of the transfer matrix that relates the output variables and the system perturbation. The algorithm is especially developed to analyze the compensation performance of shunt and series active power filters. The algorithm is proved by simulation in a multibus industrial power distribution system and programmed in Matlab.
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    A series active power filter scheme for current harmonic compensation
    (IEEE, 2008) Figueroa, Diego; Moran, Luis; Ruminot, Pedro; Dixon, Juan
    A series active power filter to eliminate current harmonic components and compensate reactive power is presented and analyzed. The proposed active compensation technique is based in a series active filter composed by two single-phase inverters sharing the same DC bus, and is suitable for current harmonics and reactive power compensation generated by static converters. The proposed approach allows for low cost, simplicity and part count reduction in comparison with previous compensation solutions (passive and active). The paper analyzes the proposed series active power filter in terms of principles of operation, power circuit topology, control design and implementation. Experimental results obtained in a laboratory DSP based controlled prototype confirm the viability of the proposed compensation technique.
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    Fault 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, Luis
    Asymmetric 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.
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    Fault-Tolerant Reconfiguration System for Asymmetric Multilevel Converters Using Bidirectional Power Switches
    (IEEE, 2009) Barriuso, Pablo; Dixon Rojas, Juan, 1948-; Flores Lara, Patricio Armando; Moran, Luis
    Asymmetric 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.
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    High power machine drive, based on three-stage connection of "H" converters, and active front end rectifiers
    (IEEE, 2003) Dixon Rojas, Juan; Breton, Alberto A.; Rios, Felipe E.; Moran, Luis
    A three-stage inverter using "H" converters is being analyzed for high power machine drive applications. The great advantage of this kind of converter is the minimum harmonic distortion obtained at the machine side. The drawbacks are the isolated power supplies required for each one of the three stages of the multiconverter. In this paper this problem has been overcome in two ways: 1) by using independent windings for each phase of the motor, or 2) by using independent input transformers. Special configurations and combinations of passive rectifiers and active front end rectifiers for one of the stages of the drive are used to eliminate all input harmonics. The topology can also keep unity power factor at the input terminals. Simulation results are shown and some experiments with small four-stage prototypes are displayed. The control of this multi-converter is being implemented using DSP controllers, which give flexibility to the system.
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    Interaction between Passive Filter and High Power Cycloconverter Drive
    (IEEE, 2009) Olivares, Cristhian; Astudillo, Pablo; Moran, Luis; Dixon Rojas, Juan
    This paper presents the study of dynamic interactions between passive filters and high power cycloconverters drives. The dynamic interaction considers the impact of connection and disconnection of passive filters operating in conjunction with high power cycloconverters. The inrush currents generated by filter connection affects the cycloconverter operation. The paper presents a detailed analysis based on results obtained from a real grinding mill plant with one SAG and two ball mill drives. The analysis presented in this paper includes the simulated model developed in MATLAB, transient analysis for connection and disconnection of the passive filter set, and recommendations to avoid transient interactions that affect cycloconverters drive operation.
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    Passive Filters for High Power Cycloconverter Grinding Mill Drives
    (IEEE, 2009) Aravena, Pablo; Vallebuona, Giovanni; Moran, Luis; Dixon Rojas, Juan, 1948-; Godoy, Orlando
    This paper presents a design method for passive filters used to compensate power factor and current harmonics generated by high power cycloconverter drives. The paper includes the analysis of different passive filter topologies effectiveness (band-pass, high-pass and C type), a procedure to calculate filter parameters, tuning frequency selection, and reactive power distribution. The passive filters are designed to compensate high power grinding mill drives energized from cycloconverters. Simulated results based on a real grinding mill plant prove the effectiveness of the proposed method.
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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