Abstract
This study presents a novel concept for a distributed current optical sensing network, suitable for protection and fault location applications in high-voltage multi-terminal direct current (HV-MTDC) networks. By utilising hybrid fibre Bragg grating-based voltage and current sensors, a network of current measuring devices can be realised which can be installed on an HV-MTDC network. Such distributed optical sensing network forms a basis for the proposed ‘single-ended differential protection’ scheme. The sensing network is also a very powerful tool to implement a travelling-wave-based fault locator on hybrid transmission lines, including multiple segments of cables and overhead lines. The proposed approach facilitates a unique technical solution for both fast and discriminative DC protection, and accurate fault location, and thus, could significantly accelerate the practical feasibility of HV-MTDC grids. Transient simulation-based studies presented in the paper demonstrate that by adopting such sensing technology, stability, sensitivity, speed of operation and accuracy of the proposed (and potentially others) protection and fault location schemes can be enhanced. Finally, the practical feasibility and performance of the current optical sensing system has been assessed through hardware-in-the-loop testing.
Highlights
Power transmission based on high-voltage direct current (HVDC) networks is expected to be the favoured technology for massive integration of renewable energy sources and the realisation of European and Asian supergrids [1, 2]
The work conducted in [4, 5] is further demonstrated to highlight the technical merits when adopted for protection and fault location applications in HVDC networks
The entire response of the system is of great resemblance to simulation-based results and the protection scheme can be considered practically feasible
Summary
Power transmission based on high-voltage direct current (HVDC) networks is expected to be the favoured technology for massive integration of renewable energy sources and the realisation of European and Asian supergrids [1, 2]. Following the fast and successful fault clearance, the important action is the accurate calculation of its distance with regards to feeder's length. This is of major importance as it will permit faster system restoration, diminish the power outage time, and enhance the overall reliability of the system. The work conducted in [4, 5] is further demonstrated to highlight the technical merits when adopted for protection and fault location applications in HVDC networks
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