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All conventional techniques for measuring frequency result in large deviations to the perceived or calculated frequency when the AC waveform undergoes a phase step. The deviation magnitude and duration are dependent on the phase step magnitude, and the applied windowing/filtering. Such phase steps do occur in the power system, and the erroneous frequency calculation can result in inappropriate reactions...
This paper describes the development of distribution state estimation for trial on the Orkney Isles in the north of Scotland. The paper discusses the techniques selected for the trial based on the requirements of the distribution network operator. The techniques include the use of a novel error estimation technique that calculates an error interval for data derived via distribution state estimation.
The amount of Distributed Generation (DG - often from renewable energy sources) connected to the UK power system is increasing. This increase has the potential to affect the reliability of protection system operation (a number of instances of protection maloperation have already been experienced [1]). Issues associated with protection that have previously been considered in the literature include:...
Parallel resonant ballast inverters are often used to drive fluorescent light application including backlight for the cold cathode fluorescent lamps (CCFL) for liquid crystal display (LCD) units. Besides the traditional requirements of high efficiency, low EMI noise and dimming capability, there are two important requirements. Those are the array light level evenness and the quality of the lamp current...
Based on small-signal models, comparisons were made for three commonly-used control schemes for adaptive voltage position for VRM applications. Performances compared include output impedance, control stability, and audio susceptibility. "AVP+" control compares favorably among the three schemes
Based on small-signal models, comparisons were made for three commonly-used control schemes for adaptive voltage position for VRM applications. Performances compared include output impedance, control stability, and audio susceptibility. "AVP+" control compares favorably among the three schemes.
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