Estimation of Stray Parameters in Lightning Impulse Voltage Generation Circuit

Abstract

This paper presents a frequency domain method for estimating the stray circuit parameters of the lightning impulse voltage generator. In the first step for estimation of such circuit parameters, the lightning impulse voltage waveforms generated by the generator with a measuring system and without a test object are measured and recorded by a digital oscilloscope. Using the Fourier transform, signals are converted from the time domain to the frequency domain. Then, multiple linear regression is utilized to determine the stray series inductance, paralleled resistance, and paralleled capacitance. From the known stray circuit components and the load circuit parameters, the generator circuit components can be effectively adjusted with the help of a circuit simulator to obtain the waveform parameters as per the standard requirements. For the verification of the proposed method, some simulations and experiments were performed and compared. From the simulation results of the determination of the stray circuit parameters, the proposed method is fairly accurate, and the deviations are within 3%. Also, the simulation results agree well with the experimental ones.