tailieunhanh - Báo cáo hóa học: " Research Article Prony Analysis for Power System Transient Harmonics"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Prony Analysis for Power System Transient Harmonics | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 48406 12 pages doi 2007 48406 Research Article Prony Analysis for Power System Transient Harmonics Li Qi Lewei Qian Stephen Woodruff and David Cartes The Center for Advanced Power Systems Florida State University Tallahassee FL 32310 USA Received 9 August 2006 Revised 15 December 2006 Accepted 18 December 2006 Recommended by Irene Y. H. Gu Proliferation of nonlinear loads in power systems has increased harmonic pollution and deteriorated power quality. Not required to have prior knowledge of existing harmonics Prony analysis detects frequencies magnitudes phases and especially damping factors of exponential decaying or growing transient harmonics. In this paper Prony analysis is implemented to supervise power system transient harmonics or time-varying harmonics. Further to improve power quality when transient harmonics appear the dominant harmonics identified from Prony analysis are used as the harmonic reference for harmonic selective active filters. Simulation results of two test systems during transformer energizing and induction motor starting confirm the effectiveness of the Prony analysis in supervising and canceling power system transient harmonics. Copyright 2007 Li Qi et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION In today s power systems the proliferation of nonlinear loads has increased harmonic pollution. Harmonics cause many problems in connected power systems such as reactive power burden and low system efficiency. Harmonic supervision is highly valuable in relieving these problems in power transmission systems. Further shunt active filters can be connected in power distribution systems to improve power quality. With the compensating currents injected by the

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