On the Empirical Estimation of Utility Distribution Damping Parameters using Power Quality Waveform Data

Artikel i vetenskaplig tidskrift, 2007

Efficient yet accurate methodology for estimating the system damping is described in this paper. The proposed technique is based on the 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 can quantify effective X/R ratio of the 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 the utility may take preventive measures and improve PQ the system.