Quantification of voltage fluctuations caused by a wave farm connected to weak, rural electricity networks

This paper describes a wave-to-wire model of an array of wave energy converters developed in MATLAB/Simulink. The effects of connecting a 1MW wave farm to a weak, rural electricity network are investigated. Impacts of the wave farm on voltage quality are examined and both conventional and more intelligent control methods by which these impacts can be mitigated are discussed. The control methods compared are: constant voltage operation, constant power factor operation, On Load Tap Changing Transformer (OLTC) operation, automatic voltage and power factor controller (AVPFC) operation and fuzzy logic power factor controller operation. The applicability of these control methods are compared using certain indices - flicker severity index, voltage fluctuation index and global voltage regulation. Drawbacks of power factor control, voltage control and control using the OLTC transformer and the advantages of using more intelligent control methods, like the AVPFC or the fuzzy logic power factor controller, are established.

[1]  Jae-Chul Kim,et al.  The online voltage control of ULTC transformer for distribution voltage regulation , 2001 .

[2]  Bertrand Chapron,et al.  A Global View of Swell and Wind Sea Climate in the Ocean by Satellite Altimeter and Scatterometer , 2002 .

[3]  Aristides Kiprakis,et al.  Increasing the capacity of distributed generation in electricity networks by intelligent generator control , 2005 .

[4]  M. Waclawiak,et al.  Indices for assessing utility distribution system RMS variation performance , 1998 .

[5]  António F.O. Falcão,et al.  Modelling and control of oscillating-body wave energy converters with hydraulic power take-off and gas accumulator , 2007 .

[6]  D. Karlsson,et al.  Combined Local and Remote Voltage and Reactive Power Control in the Presence of Induction Machine Distributed Generation , 2007, IEEE Transactions on Power Systems.

[7]  M. Donelan,et al.  Directional spectra of wind-generated ocean waves , 1985, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[8]  J.F.G. Cobben,et al.  Flickermeter used for different types of lamps , 2007, 2007 9th International Conference on Electrical Power Quality and Utilisation.

[9]  Tim Stallard,et al.  Time series analysis-based adaptive tuning techniques for a heaving wave energy converter in irregular seas , 2007 .

[10]  A. R. Wallace,et al.  Modelling arrays of wave energy converters connected to weak rural electricity networks , 2009, 2009 International Conference on Sustainable Power Generation and Supply.

[11]  J.C.M. Vieira,et al.  Influence of excitation system control modes on the allowable penetration level of distributed synchronous generators , 2005, IEEE Transactions on Energy Conversion.

[12]  Thomas Worzyk,et al.  Submarine power cables , 2009 .

[13]  Paul C. Krause,et al.  Analysis of electric machinery , 1987 .

[14]  Odd M. Faltinsen,et al.  Sea loads on ships and offshore structures , 1990 .

[15]  D.J.T. Carter.  Estimation of wave spectra from wave height and period , 1982 .

[16]  Ian R. Young,et al.  Wind Generated Ocean Waves , 1999 .

[17]  J. C. Gomez,et al.  Flicker Measurement and Light Effect , 2002, IEEE Power Engineering Review.

[18]  Jos Arrillaga,et al.  Computation of the short-term flicker severity index , 2000 .

[19]  A. R. Wallace,et al.  Voltage quality control of a 1MW wave farm connected to weak, rural electricity networks , 2010, 45th International Universities Power Engineering Conference UPEC2010.

[20]  W. Cummins.  THE IMPULSE RESPONSE FUNCTION AND SHIP MOTIONS , 2010 .

[21]  Aristides Kiprakis,et al.  Effects of array configuration, network impacts and mitigation of arrays of wave energy converters connected to weak, rural electricity networks , 2010 .

[22]  M. M. Saied.  The global voltage regulation: a suggested measure for the supply quality in distribution networks , 2001 .

[23]  A.M. Knight,et al.  A review of power converter topologies for wind generators , 2005, IEEE International Conference on Electric Machines and Drives, 2005..

[24]  D. Zaninelli,et al.  A Matlab-Simulink flickermeter model for power quality studies , 2004, 2004 11th International Conference on Harmonics and Quality of Power (IEEE Cat. No.04EX951).

[25]  J.C. Lavandero,et al.  Instrumentation and methodology for revision of European flicker threshold , 2002, 10th International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.02EX630).

[26]  A. R. Wallace,et al.  Maximising energy capture from distributed generators in weak networks , 2004 .

[27]  J.A. Ferreira,et al.  Model reduction and control of electronic interfaces of voltage dip proof DG units , 2004, IEEE Power Engineering Society General Meeting, 2004..