Patent ID: 8456176
Filing Date: 2013-06-04
Classification: G01R

Abstract:
1. A method of monitoring impedance of an electrical system, comprising the steps of: (a) providing an impedance monitoring station having software installed thereon and adapted to test and monitor system impedance; (b) running an initialization test using the software to compare an actual load current to reconstructed current waveforms; (c) taking Thevenin equivalent source measurements for voltage and current; (d) using Fast Fourier Transform to reduce the influence of noise and momentary changes in waveforms; (e) analyzing data and reconstructing waveforms for voltage and current; (f) solving for system impedance in a time domain using Least Squares; (g) solving for a Thevenin source voltage and a Thevenin source phase angle; (h) calculating a non-conduction voltage error to determine if a direct solution is under or over estimated; (i) calculating harmonic impedance in a frequency domain; and (j) determining a time domain driving point impedance and a frequency domain driving point impedance to identify the impedance of the system.