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Title Adaptive filtering and control for an ASVC
Author Yates, Devon Veronica Evelyn
Supervisor Poulsen, Niels Kjølstad (Department of Informatics and Mathematical Modeling, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2005
Abstract Stability and efficiency in the electrical grid is very dependent on fluctuations in reactive power which may be caused by wind turbines, transformers, generators, motors, and capacitor-reactor banks. Control of these variations can be accomplished by using advanced static var compensators(ASVC). ASVC are capable of compensating for variation in the reactive power load, but are disrupted when harmonics are present in the system. Filtering to remove these harmonics, but introduce a lag into the control system. Suboptimal control of compensation can result in high losses and voltage fluctuations, and may cause the ASVC to go offline during disturbances. A description of the noise in the grid has been determined using time series analysis methods with measured data from the grid. This model has been used to design a stochastic adaptive filtering system which can quickly recognize and react to actual phase shifts, thereby improving the quality and speed of the compensation, while remaining impervious to harmonic distortion. This adaptive filter has been implemented in a integral control system with gain scheduling. A mean model of an ASVC is developed, as well as a switched model, and the control strategy is tested upon it.
Imprint Department of Informatics and Mathematical Modeling, Technical University of Denmark, DTU : DK-2800 Kgs. Lyngby, Denmark
Pages 86
Keywords ASVC; STATCOM; FACTS; reactive power; harmonic filter; adaptive estimation; stochastic estimation; Harmonic estimation; wind turbine; synchronization; symmetrical components
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Admin Creation date: 2006-06-22    Update date: 2012-12-19    Source: dtu    ID: 185884    Original MXD