Browsing by Author "Dixon, JW"

Now showing 1 - 3 of 3
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    A simple frequency-independent method for calculating the reactive and harmonic current in a nonlinear load
    (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1996) Tepper, JS; Dixon, JW; Venegas, G; Moran, L
    A basic criterion that determines the behavior of an active power filter is the method of calculating the reference current, There are many ways of generating this reference, but the methods are generally complex and hard to tune, This paper describes a simple and effective method for calculating the reference current, necessary to feed a shunt active power filter to compensate the power factor and harmonic currents generated by a nonlinear load. Simulations and experimental results are presented, showing that the proposed circuit may operate at frequencies ranging from 40 to 65 Hz without adjustment.
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    Improving passive filter compensation performance with active techniques
    (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003) Rivas, D; Moran, L; Dixon, JW; Espinoza, JR
    This paper presents the performance analysis of a hybrid filter composed of passive and active filters connected in series. The analysis is done by evaluating the influence of passive filter parameters variations and the effects that different active power filter's gain have in the compensation performance of the hybrid scheme. The compensation performance is quantified by evaluating the attenuation factor in a power distribution system energizing high-power nonlinear loads compensated with passive filters and then improved with the connection of a series active power filter. Finally, compensation characteristics of the hybrid topology are tested on a 10-kVA experimental setup.
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    Open-loop VAr compensator for industrial applications, using a single PWM pattern
    (IEE-INST ELEC ENG, 1997) Dixon, JW; Veas, DR
    The authors present the analysis of an open-loop, three-phase static VAr compensator (SVC) based on a voltage source inverter, using only one fixed pulse width modulation (PWM) pattern. The VAr generation is controlled by shifting this PWM pattern according to the AC-mains voltage. Because the system is naturally stable, there is no need to control the capacitor DC voltage, which takes a particular stable voltage for each power factor operation condition. To prove this particular behaviour, a stability analysis, based on the d-q frame is developed. From this analysis, the circle diagram of the VAr compensator is obtained, which gives all the operating characteristics related to the DC voltage, power angle operation, and reactive power generated. The main characteristics of this compensator are its simplicity and its strong stability, which are particularly suitable for use in industrial loads, such as induction motors, thyristor rectifiers and other low power factor loads. This open-loop system is suitable in the range 1-20kvar. The experimental results confirm the operating characteristics given by computer simulations and analysis.