Unformatted text preview: a hybrid wind/diesel power systems an
attractive proposition in many areas where there is an adequate wind resource. By incorporating a wind
turbine(s) into a diesel grid offers the potential of decreased generation costs through fuel savings and
reduced generator run times (lower maintenance).
The ratio of the wind plant capacity to the peak grid load determines what is termed the penetration. Low
penetration levels (less than 10%) need only basic control systems to interact with the primary diesel power
8-13 (Source: http://www.danvest.com/princip.htm)
A wind diesel system may operate in up to three different modes, depending on the level of wind penetration.
1) The wind is below cut-in speed; hence the load is supplied by the diesel gensets. The voltage is
controlled by the synchronous generator’s regulator and the frequency is controlled by the speed
governor of the diesel engine.
8-14 2) The load is supplied jointly by the wind turbines and the genset. The system controller determines
what capacity genset(s) to operate to ensure efficient diesel operation.
3) There is sufficient wind for the turbine to supply the load. As wind generated power increased gensets
were progressively shut down. Where excess wind power is generated, this is either dumped as heat
or used by a supplementary load such as water pumping or purification. The voltage and frequency is
controlled by the turbines power electronics or a synchronous converter. References:
 Heier, S., Grid Integration of Wind Energy Conversion Systems, John Wiley and Sons Ltd, UK,
 Ackermann, T. and Söder, L., Wind energy technology and current status: a review, Renewable
and Sustainable Energy Reviews, 4, 2000, p 348.
 Carlin, P.W, Laxson, A.S., Muljadi E.B. The History and State of the Art of Variable-Speed Wind
Turbine Technology. NREL/TP-500-28607. 2001.
 Schreiber D. State of the Art of Variable Speed Wind Turbines. 11th International Symposium on
Power Electronics Ee 2001.
 Manwell, J.F., McGowan, J.G. and Rogers, A.L. (2002) Wind Energy Explained – Theory,
Design and Application, John Wiley and Sons, UK, p239.
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This note was uploaded on 06/09/2011 for the course PV 5053 taught by Professor Aasd during the Three '11 term at University of New South Wales.
- Three '11