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Open AccessFeature PaperArticle

Design and Control of a DC Collection System for Modular-Based Direct Electromechanical Drive Turbines in High Voltage Direct Current Transmission

School of Electrical and Electronic Engineering, Newcastle University, Singapore 567739, Singapore
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Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Electronics 2020, 9(3), 493; https://doi.org/10.3390/electronics9030493
Received: 22 December 2019 / Revised: 29 February 2020 / Accepted: 6 March 2020 / Published: 16 March 2020
(This article belongs to the Special Issue Applications of Power Electronic Circuits and Systems for Future Grid)
In response to an increasing demand for offshore turbine-based technology installations, this paper proposes to design a DC collection system for multi-connected direct drive turbines. Using tidal stream farm as the testbed model, inverter design and turbine control features were modelled in compliance with high voltage ride-through capabilities that operate in isochronous mode suggested by IEEE1547-2018. The aim of the paper is twofold. Firstly, operation analyses in engaging a single-stage impedance source inverter as an AC-link busbar aggregator to pilot a parallel-connected electromechanical drive system. It uses a closed-loop voltage controller to secure voltage-active power (Volt/Watt) dynamics in correspondence with turbine’s arbitrary output voltage level. It also aspires to truncate active rectification stages at generation-side as opposed to a traditional back-to-back converter. Secondly, a proposition for a torque-controlled blade pitching system is modelled to render a close to maximum power point tracking using blade elevation and mechanical speed manipulations. The reserve active power generation aids with compensating an over-voltage crisis as a substitute for typical reactive power absorption. The proposed Testbed system was modelled in PSCAD, adopting industrial related specifications and real-time ocean current profiles for HVDC transmission operations. Analytical results have shown a positive performance index and transient responses at respective tidal steam turbine clusters that observe fault ride-through criterion despite assertive operating conditions. View Full-Text
Keywords: energy conversion; solid state circuits; variable speed drives; fault tolerant control; HVDC transmission energy conversion; solid state circuits; variable speed drives; fault tolerant control; HVDC transmission
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Bin Mohamad Saifuddin, M.R.; Ramasamy, T.N.; Qi Tong, W.P. Design and Control of a DC Collection System for Modular-Based Direct Electromechanical Drive Turbines in High Voltage Direct Current Transmission. Electronics 2020, 9, 493.

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