3 results about "Resonance point" patented technology

The present invention discloses a method for detecting a resonance point of a reduced-order generalized integrator based on a device for identifying relationship between a transmission line and a transformer. The method actively transmits a carrier signal with a specified frequency to a power grid through the device for identifying the relationship between the transmission line and the transformer. Firstly, voltage and current signals of the power grid at the access point of the device for identifying the relationship between the transmission line and the transformer are collected; secondly, according to the extracted voltage and current signal data, the harmonic voltage and harmonic current signals with the injection frequency are extracted by using the computational formula of the reduced-order generalized integrator; then, according to the cosine similarity formula, the cosine similarity coefficient of the extracted harmonic signals with the injection frequency are calculated; finally, the resonant frequency range is judged by the calculated similarity coefficient, and the range is further reduced after the above steps are repeated by changing the injection frequency. With the solution, the calculation amount is small, and the resonant frequency range of power grid can be detected in real time.