Browsing by Author "Moran, L."

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    A New Compensation Method for High Current Non-Linear Loads
    (IEEE, 2006) Ruminot, P.; Moran, L.; Aeloiza, E.; Enjeti, P.; Dixon Rojas, Juan
    A new active compensation scheme to eliminate current harmonic components and compensate reactive power for high current non-linear loads is presented and analyzed. The new active compensation technique is based in a series active filter that employs a unique power circuit topology (two single phase inverters) with a simple control scheme, and is suitable for current harmonics and reactive power compensation. It is address to compensate highly polluted electric feeders such as the ones connected to high current rectifiers. The proposed approach allows for low cost and part count reduction in comparison with previous compensation solutions (passive and active). The paper analyzes the new active power compensation technique in terms of principles of operation, power topology, control design and implementation. Experimental results obtained in a laboratory DSP based controlled prototype are presented validating the simulated waveforms and confirming the viability of the proposed compensation technique
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    A New Hybrid Filter Topology for Sub and Inter-Harmonic Attenuation in Cycloconverter-Fed Drives Applications
    (IEEE, 2009) Aravena, P.; Moran, L.; Dixon Rojas, Juan; Espinoza, J.; Godoy, O.
    This paper presents a filter scheme composed by passive and series active power filters specially designed to compensate fundamental reactive power (with passive filters) and current harmonics (combination of passive and active). Low frequency current sub and inter-harmonics generated by cycloconverters are eliminated with an active power filter connected in series to a C type passive filter. Current frequency harmonics associated with cycloconverter topology are eliminated with passive filter units. With the proposed filter topology compensation effectiveness is significantly improved and allows the elimination of passive filter units, reducing cost and space required as compared with traditional passive schemes. This paper presents the principles of operation and design requirements of the proposed hybrid filter scheme. Simulated results based in the compensation of a real grinding mill plant prove the effectiveness and advantages of the proposed scheme.
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    Current harmonics compensation for electrolytic processes using a series active scheme
    (INST ENGINEERING TECHNOLOGY-IET, 2012) Acuna, P.; Moran, L.; Dixon, J.
    A series active filter to compensate current harmonics injected by high-power rectifiers [such as in copper electro-winning (EW) and electro-refining (ER) processes] is presented and analysed. The proposed current harmonic compensation method is accomplished by injecting a corresponding series voltage distortion at the rectifier ac terminals. The distorted ac voltage generated at the high-power rectifier ac terminal forces the line current to be sinusoidal and increases dc voltage distortion, but it does not affect the EW or ER processes. A complete design procedure for the series active system is presented. In conjunction with simulated results obtained from a 10 MVA copper EW facility, a 2 kVA laboratory prototype is used to validate the current harmonic compensator scheme. The results obtained through simulation and from the experimental prototype confirm the viability of the proposed compensator and associated control strategy.
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    Reactive Power Compensation Technologies: State-of-the-Art Review
    (2005) Dixon Rojas, Juan; Moran, L.; Rodriguez, J.; Domke, R.
    This paper presents an overview of the state of the art in reactive power compensation technologies. The principles of operation, design characteristics and application examples of Var compensators implemented with thyristors and self-commutated converters are presented. Static Var generators are used to improve voltage regulation, stability, and power factor in ac transmission and distribution systems. Examples obtained from relevant applications describing the use of reactive power compensators implemented with new static Var technologies are also described.
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    Voltage-source active power filter based on multilevel converter and ultracapacitor DC link
    (2006) Ortúzar Dworsky, Micah Etan; Carmi, R. E.; Dixon Rojas, Juan; Moran, L.
    A new topology for active power filters (APF) using an 81-level converter is analyzed. Each phase of the converter is composed of four three-state converters, all of them connected to the same capacitor dc link voltage and their output connected in series through output transformers. The main advantages of this kind of converter are the negligible harmonic distortion obtained and the very low switching frequency operation. The single-phase equivalent circuit is analyzed and their governing equations derived. The dc link voltage control, based on manipulating the converter's voltage phase, is analyzed together with the circuit's characteristics that determine the capability to draw or deliver active and reactive current. Simulation results for this application are compared with conventional pulsewidth-modulated (PWM) converters, showing that this filter can compensate load current harmonics, keeping better-quality sinusoidal currents from the source. The simulated configuration uses a 1-F ultracapacitor in the dc link, making it possible to store energy and deliver it during short voltage dips. This is achieved by applying a modulation control to maintain a stable ac voltage during dc voltage drops. A prototype of the filter was implemented and tested, and the obtained current waveforms showed to be as good as expected.