Optimal size selection for step-up transformers for wind generation plants

This paper presents a general design methodology to optimally select the ratings of step-up transformers for grid connected Wind Turbine Generators on the basis of the statistical distribution of the wind energy and the mathematical model of the plant. The methodology exploits a probabilistic approach based on the evaluation of the so called LPPP (Loss of Produced Power Probability) index. The Internal Rate of Return (IRR) and the Discount Payback Period (PBP) can be computed from the results of the LPPP analysis and exploited to detect the most advantageous solution.