| 摘要 |
The invention relates to a method for the reconstruction of a fault-reduced voltage signal corresponding in the frequency, amplitude, and phase position thereof to a sinusoidal input voltage (U) fault-prone in frequency, amplitude and/or phase position. The invention provides that the input voltage (U) is fed to a first band-pass filter (F1) having an adjustable resonant frequency (f) and having an adjustable amplification A, the output voltage (U) of which represents the fault-reduced voltage signal, wherein a controlled variable (SG(f)) is determined for a first controller (R1) by determining the scanned differential voltage (Uf3) of the output voltage (U) and the input voltage (U) in the zero points of the output voltage (U), the controller adjusting the resonant frequency (f) of the first band-pass filter (F1) such that the differential voltage (Uf3) in the zero points disappears, and a controlled variable (SG(A)) is determined for a second controller (R2) by determining the scanned differential voltage (U3) of the output voltage (U) and the input voltage (U) in the vertexes of the output voltage (U), the second controller controlling the amplification (A) of the first band-pass filter (F1) such that the differential voltage (U3) in the vertexes disappears.
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