Research on Vibration Measurement and Characteristics of Converter Transformer Considering the Influence of Harmonics

The vibration of the converter transformer is related to voltage and current. The high-voltage direct current transmission system contains a lot of harmonics, and the generated vibration and noise seriously affect its operating environment. The current research has not fully considered the impact of harmonics on vibration. In order to reveal the relationship between the two, this paper sets up a vibration measurement experiment, collects the vibration and voltage and current waveforms of the converter transformer box in operation, and analyzes the harmonic spectrum and the time-frequency characteristic distribution of vibration signals. The results prove that harmonics will shift the dominant frequency of vibration, and the valve-side voltage harmonics are one of the main causes of high-frequency vibration components. The research results provide a theoretical basis for the on-line diagnosis of vibration measurement technology and the suppression of vibration and noise.