Abstract
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.
Highlights
A revolution in harnessing ocean current energies into electricity needs exceptional advancement to expedite its maturity towards the future’s energy mix
This paper extends its contribution into engineering truncated DC collection point and tidal energy conversion system for HVDC transmission from the typical two-stage Voltage Source Converter (VSC) (BtB-VSC) to a single-stage ZSI with a centralised active rectifier at a respective cluster
This paper has presented analytical evaluations on both technical modelling and financial viewpoints when operating large-scale offshore tidal stream turbine farm in an HVDC-configured transmission network
Summary
A revolution in harnessing ocean current energies into electricity needs exceptional advancement to expedite its maturity towards the future’s energy mix. It was projected to generate a total power of 6 MW from the four installed 1.5 MW tidal stream turbine (TST). Distinct from such initiations, investors in power utilities around the world have consent that tidal power time has arrived [2,3]. As tidal current profiles are classified as a predictive source of energy that oscillates in a habitual pattern at a specific time and day, research and statistical analyses have prophesied that TST technology will take its precedence in generating 15% of UK’s renewable electricity. Experts suggest that augmentation in TST technology must be prioritized to transcend supremacy against other offshore energy harvesting avenues [6] for mainland electrifications. TST developers must radically rethink new ecotechnological and dependable operational solutions that can extend grid-tied interoperability
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