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 On the Empirical Estimation of Utility Distribution Damping Parameters Using Power Quality Waveform Data | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 95328 12 pages doi 2007 95328 Research Article On the Empirical Estimation of Utility Distribution Damping Parameters Using Power Quality Waveform Data Kyeon Hur 1 Surya Santoso 1 and Irene Y. H. Gu2 1 Department of Electrical and Computer Engineering The University of Texas at Austin Austin TX 78712 USA 2 Department of Signals and Systems Chalmers University of Technology 412 96 Gothenburg Sweden Received 30 April 2006 Revised 18 December 2006 Accepted 24 December 2006 Recommended by M. Reza Iravani This paper describes an efficient yet accurate methodology for estimating system damping. The proposed technique is based on linear dynamic system theory and the Hilbert damping analysis. The proposed technique requires capacitor switching waveforms only. The detected envelope of the intrinsic transient portion of the voltage waveform after capacitor bank energizing and its decay rate along with the damped resonant frequency are used to quantify effective X R ratio of a system. Thus the proposed method provides complete knowledge of system impedance characteristics. The estimated system damping can also be used to evaluate the system vulnerability to various PQ disturbances particularly resonance phenomena so that a utility may take preventive measures and improve PQ of the system. Copyright 2007 Kyeon Hur 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 Harmonic resonance in a utility distribution system can occur when the system natural resonant frequency formed by the overall system inductance and the capacitance of a capacitor bank is excited by relatively small harmonic currents from nonlinear loads 1 . The system voltage and current maybe amplified and highly distorted .
