Detection and location of HVDC commutation faults from PMU data

Sammanfattning: Commutation Failures in LCC HVDC converters is a topic that is normally addressed from the component perspective, looking at converters’ internal signals. How these commutation failures affect the outer AC network is not deeply understood yet. This thesis will provide proof of how commutation failures causes abnormal behavior in the AC network, and how PMU data can be used in order to distinguish commutation failure from AC faults. In order to do so, simulations have been carried out in PSCAD and MATLAB-Simulink. The spreading of commutation failures in a bigger network, in this case NORDIC32, has also been studied using DigSilent-PowerFactory.