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Title: Comparative analysis of high voltage alternating current & high voltage direct current offshore collection grid systems
Authors: Pillay, Caleb Jordache 
Issue Date: 1-Dec-2021
An increase in industries as well as the world’s population, is causing a strain on the
electricity supply. This coupled with the fact that fossil fuel supplies are decreasing, is
leading the world to new, greener methods of electrical energy generation. Offshore wind
farms are being developed far offshore and solar farms are being developed in remote
locations with intense sunlight. This allows for the optimal operation of these systems.
HVAC collection systems for offshore wind farms have traditionally been used but
imposes limitations on the transmission distance. Exuberant amounts of capital are
required for greater distances. HVDC systems have started to be recognised as a viable
method of transmitting this electrical energy at a much lower cost on longer distances.
This study shows a comparative performance and cost evaluation of both HVAC and
HVDC collection systems for offshore wind farms. It evaluates the efficiency of the wind
farm based on system losses, determines the advantages, disadvantages, and cost
implications of each system, and determines the best type of technology to be used in
offshore applications. The study looks at a case of a 40 MW wind farm at a distance of
120 km offshore. A simulation is developed for each system using MATLAB simulation
software to determine the performance of each system during normal operation and fault
conditions. From these simulations, it was found that HVDC collection systems have
much higher efficiency when compared to HVAC systems and perform better under both
normal operation and fault conditions. HVDC systems also have a lower cost once the
break-even distance point is passed. From the study, it is found that HVDC collection
systems are much better suited to allow offshore wind farms to have a high efficiency as
well as be located further offshore to allow for maximum wind usage. The technology
can be used for other long-distance transmission systems and incorporated for other
renewable energy generation systems.
A dissertation submitted in fulfilment of the requirements for the Master of Engineering: Electrical Power Engineering, Faculty of Engineering and the Built Environment, Durban University of Technology, 2021.
Appears in Collections:Theses and dissertations (Engineering and Built Environment)

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