Patent ID: 11899050
Assignee: WOBBEN PROPERTIES GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H  Y | IPC G  H

Claim 5:
6. The method as claimed in claim 1, comprising:
recording a plurality of series of measurements of the grid variable, wherein:
each series of measurements of the plurality of series of measurements is recorded for analyzing a respective frequency range,
for each series of measurements of the plurality of series of measurements, a respective measurement time period is selected depending on the respective frequency range,
for each series of measurements of the plurality of series of measurements, multiplying each measurement point of the series of measurements by the test function and summing the plurality products to produce the product sum is repeated while varying the test frequency and/or varying the test angle to obtain a respective plurality of product sums for each series of measurements, and
for each series of measurements, the respective plurality of product sums are evaluated for detecting the low-frequency oscillation.