Method for determining the amplitude and phase angle of a measurement signal corresponding to a current or a voltage of an electrical power supply network

摘要

The invention relates to a method for determining the amplitude and phase angle of a current or voltage at a measurement signal corresponding to an electrical power supply network with samples of the measurement signal, with the samples using a model containing at least one sinusoidal component for the measurement signal using a recursive least-squares estimation method the amplitude and the phase of the measurement signal are calculated. DOLLAR A In order to be able to determine the frequency of the measurement signal together with the amplitude and the phase angle, a model for the measurement signal according to the relationship y = AZ sin (2bft + ^) is used and with this model and the samples (ym) by means of a recursive non-linear least-squares estimation method also determines the frequency of the measurement signal (um). By expanding the signal model, measurement signals with a constant component and with frequencies that change over time can also be examined.