This paper presents the analysis of the study of the flicker emitted from the 1.2 MW tidal energy converter (TEC), SeaGen, against varying tidal parameters. This paper outlines the main elements of the TEC itself, the environment it is located in and the measurement set up. In this paper, the flicker emitted by the TEC is compared with the different tidal parameters, including flood and ebb tides, tidal speed, water depth and turbulence strength and intensity. Flicker emissions have been calculated from measured data in over 90 measurement (10 min) periods, and all of the tidal parameters vary significantly over that testing period. This allows for a detailed statistical and graphical analysis of the variation of flicker with the variation of the tidal parameters outlined above. It is found, with the exception of tidal speed, that there is no strong relationship between flicker emissions and any other tidal parameter. As SeaGen is an asymmetrical TEC with full blade pitching for flood and ebb generation, it was also found that the expected difference of flicker emissions owing to the effect of the submersed crossbeam was not significant. The TEC harmonic performance versus tidal speed is also presented.
SeaGen is an in-stream 1.2MW tidal energy converter (TEC) located in Strangford Lough, Northern Ireland that has been in almost continuous service since May 2009. This technical paper first outlines the characteristic features of the TEC itself and its power take-off system, followed by the electrical and marine environments of its location, and finally it presents the results of its power quality performance assessment. The PQ assessment was carried out using the existing European Norm EN50160 for assessing permissible voltage parameter variations on public electricity networks and the conclusions drawn are from data collected over a number of months of operation of the device.
A permanent magnet generator (PM) control scheme and electrical system configuration for Wave Dragon MW wave energy power take off system is presented in this paper. The characteristics of low pressure hydro turbine are introduced first. To achieve the maximum energy conversion efficiency, a variable speed control scheme of low-head hydro-turbine using IGBT AC/DC converter is described. The electrical system configuration, operation and grid connection issues are also discussed. Voltage source PWM inverters are employed to control the output power to utility grid. Simulation model has been built, and the control of tracking maximum turbine efficiency is simulated.
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