Abstract
This paper investigates the switching transient overvoltage (SOV) in an offshore wind farm (OWF) based on the measurements on an established laboratory experiment platform. The transient voltage under different vacuum circuit breaker (VCB) operation sceneries is measured, in which the measurement positions include: the terminal of wind turbine transformer (WTT), the source side of WTG VCB, and the load side of WTT. Then the feature and occurrence causes of the SOV are analyzed by revealing the variation characteristics of the transient voltage and current. To explore the mitigation effect of this SOV when protection devices are used, an OWF high frequency model considering the pre-strike and re-ignition characteristics of VCB is built in PSCAD/EMTDC and verified by the measured results. Finally, the SOV in an OWF, when the arrester and the RC Snubber are used, are obtained based on the self-defined simulation model. Additionally, the mitigation effects and their advantages and disadvantages are compared as well.
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