Abstract
This paper develops a novel one-ended non-communication protection scheme for offshore wind farm connected to the public grid through HVDC cables. The relay is installed at the DC side of the inverter station. The proposed technique for both fault detection and location along HVDC cable is based on evaluating the arriving instants of fault induced backward travelling wave and its subsequence. These instants are determined using the cross-alienation coefficients between the backward travelling waves and a unity reference function. Cross-alienation coefficients values are used for fault detection, while the difference time between two sequential coefficients peaks after fault inception are used for fault location. The required fault detection and location time is very small of milliseconds range. This will enhance the system reliability due to fast DC cables protection. The proposed protection scheme is based on continuous tracking of sampled current and voltage signals. Thereby, the proposed technique is applied on sampled movable windows of the calculated backward travelling wave and the reference function. The simulation results show that the proposed protection scheme is simple, fast, accurate, and not sensitive to fault resistance or load variations. Also its implementation is economically as no need for extra devices or communication links.
Published Version
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