By Raymond Alcorn, Dara O'Sullivan
Electrical layout for Ocean Wave and Tidal power Systems presents an electric engineering point of view on offshore strength stations and their integration to the grid. With contributions from a panel of prime overseas specialists, this booklet is vital interpreting for these operating in ocean power improvement and renewable strength.
Wave and tidal power engineering has built strongly long ago decade, with hundred-MW arrays of complete scale grid hooked up wave and tidal units deliberate for the following couple of years. Electrical layout for Ocean Wave and Tidal power Systems presents an electric engineering standpoint on those offshore energy stations and their integration to the grid. subject matters coated contain: the choice and sizing of turbines and their interplay with energy electronics, energy cables, connectors and umbilicals; grid integration and tool caliber matters; power garage; the implementation of keep watch over platforms in ocean strength units modelling and simulation; the relative costings of assorted structures; and the impact of electric layout on total venture lifetime rate.
With contributions from a panel of major overseas 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 info for Electrical Design for Ocean Wave and Tidal Energy Systems
In wind energy SCIGs have been the standard generators utilized in the 1990s, but are used less and less due to some improved characteristics of other generator technologies such as the PMSG as discussed below, as well as the availability of lower cost high-power converters. On the contrary SCIGs are widely used in TEC projects, mainly as a result of two considerations. First, the rotor structure of an SCIG is very simple and thus this type of generator system shows a very high robustness. Second, SCIGs operated as motors are the quasi-standard electrical machine in industrial applications.
24(b) shows a solution able to deal with single short-circuit or open circuit faults . In case of a short-circuit, the fuse of the faulty leg is blown and the faulty leg is isolated. Then, the generator terminal that was initially connected to the faulty leg is now connected to the midpoint of the DC bus activating the associated pair of thyristors. Once this is done a set of voltages with a phase difference of 60 degrees is generated. For instance if phase a fails, and hence the terminal a of the generator is connected continuously to the neutral point, the following set of voltages taking as a reference the DC-bus midpoint has to be generated: 9 va0 ¼ 0 > > > > > 5p > = vb0 ¼ A sin wt À 6 ð2:20Þ > > > 5p > > > vc0 ¼ A sin wt þ ; 6 Under this assumption, a balanced set of line-to-line voltages is obtained as follows: p 9 > vab ¼ A sin wt þ > > 6 > > > = p vbc ¼ A sin wt À ð2:21Þ 2 > > > 5p > > > ; vca ¼ A sin wt þ 6 It is important to highlight that a reduction on the voltage by a factor of 2 with regard to the non-fault operation is obtained when this solution is applied.
It is clear that, especially for WECs, this is a complex problem due to the high variance in device PTO type, and indeed the functionality of the generator itself within the power chain. In this regard, no single generator technology selection can be highlighted as being optimal. However, some overall guidelines for the generator selection have been provided for the different WEC categories, and generic guidelines related to offshore O&M minimization. Specification and design of the generator system in TECs have been reviewed and shown to be highly dependent on the device, turbine and current characteristics.
Electrical Design for Ocean Wave and Tidal Energy Systems by Raymond Alcorn, Dara O'Sullivan