By Raymond Alcorn, Dara O'Sullivan
Electrical layout for Ocean Wave and Tidal strength Systems presents an electric engineering viewpoint on offshore energy stations and their integration to the grid. With contributions from a panel of prime overseas specialists, this e-book is key analyzing for these operating in ocean power improvement and renewable strength.
Wave and tidal power engineering has constructed strongly some time past decade, with hundred-MW arrays of complete scale grid attached wave and tidal units deliberate for the following few years. Electrical layout for Ocean Wave and Tidal strength Systems offers an electric engineering viewpoint on those offshore strength stations and their integration to the grid. themes coated contain: the choice and sizing of turbines and their interplay with energy electronics, strength cables, connectors and umbilicals; grid integration and gear caliber concerns; power garage; the implementation of keep watch over structures in ocean power units modelling and simulation; the relative costings of assorted structures; and the impression of electric layout on total venture lifetime fee.
With contributions from a panel of prime foreign specialists, Electrical layout for Ocean Wave and Tidal strength Systems is vital analyzing for electric layout engineers, researchers and scholars operating in ocean power improvement and renewable power.
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Additional resources for Electrical Design for Ocean Wave and Tidal Energy Systems
13 Classification of control methods Circular flux trajectory (Takahashi) 26 Electrical design for ocean wave and tidal energy systems pulse width or space vector modulators. Also a very extended control scheme is the direct torque control (DTC) developed in . The DTC is a vector control scheme with closed torque and flux loops. Using bang-bang hysteresis controllers made this control concept very fast and not complicated. However, it has several drawbacks such as the requirement of a fast sampling time, a variable switching frequency and a high torque pulsation, which can be overcome using DTC-SVM .
Load shedding at high current velocities and adaption to the reversing flow direction of the two horizontal axis turbines are achieved by pitched blades. Another example of a TEC utilizing a horizontal axis turbine with pitched blades (not depicted here) is the HS1000 device . The generator of the HS1000 is housed in a nacelle mounted on a seabed-fixed tripod and has to be lifted by a floating crane for maintenance and repair. 10 SeaGen device, turbines lifted above sea-level for inspection and maintenance (reproduced by permission of Marine Current Turbines Ltd) The Kobold turbine  follows a completely different concept.
In order to overcome this drawback four-leg fault tolerant solutions have been proposed . It is also important to highlight that special attention should be put during the design of these drives in order to avoid undesired turn on of the thyristors due to high dv/dt. More details on these and other fault tolerant solutions for variable speed drives can be found in . 7 Summary This chapter has provided an outline of the issues confronting the designer of an OEC when selecting or designing the electrical generator and its associated control system.