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HVDC transmission and AC hubs for o ffshore wind generation

Stevens, Jonathan 2015. HVDC transmission and AC hubs for o ffshore wind generation. PhD Thesis, Cardiff University.
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The offshore AC hub was identified as a feasible network topology for an offshore node applied in a future pan-European Supergrid. A model of an offshore AC hub was developed in SimPowerSystemsTM using the round three offshore wind development zone Dogger Bank, as a case study. Two control philosophies, master-slave and droop control, are shown to successfully manage the voltage, current and complex power flow in the offshore AC hub following planned changes in operating conditions. The impacts of three different fault scenarios on the offshore AC hub are investigated. It is shown that each fault severely impedes normal operation of equipment in the offshore AC hub, as equipment ratings are exceeded. In addition, the loss of infeed to the onshore UK power network is extensive. Based on these outcomes, it is identified that additional fault management systems are required. A novel centralised fault management system is then developed based on an online OPF algorithm. The performance is compared to de-centralised fault management system, and advantages and disadvantages of the two methods are discussed. The centralised fault management system is implemented on a realtime platform as hardware-in-the-loop, with the offshore AC hub implemented on a Real Time Digital Simulator. The simulation and experimental results are then compared to confirm the validity of the simulation results.

Item Type: Thesis (PhD)
Status: Unpublished
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: HVDC Transmission; Power System Control; Flexible AC Transmission Systems; Wind Power Generation; Power System Protection.
Last Modified: 21 Oct 2016 05:34

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