Feature Analysis of Overvoltage in Offshore Wind Farms Using Mathematical Morphology

Due to the frequent switching operation and sudden fault, overvoltage in offshore wind farms (OWFs) can damage the power equipments and the insulation of the substations. Therefore, it is necessary to take insulation protection according to different kinds of overvoltage. In this paper, a simplified experimental platform is set up for the study of four kinds overvoltage in OWFs. To further study the characteristics of other kinds of overvoltage, a simulation model is built based on the experimental platform in PSCAD/EMTDC software. Then the mathematical morphology (MM) is utilized to process the simulation sample data and extract the different components from the transient overvoltage signals. The extracted components, which are easier to be distinguished than the original overvoltage signals, can be used as recognition features for identifying different kinds of overvoltage in OWFs.