In a wind park the wind converters can block the wind from each other. That reduces the amount of wind energy available to the respective converters. This reduction can be considered by the field efficiency. A real estimation of the field efficiency is complicated and cannot be done here. Nevertheless, you can estimate the efficiency for the calculations.
Faults and maintenance work can result in the failure of some wind converters for certain time periods. Planning errors, a wrong estimated wind speed or other problems also can cause a reduced output. All these effects can be considered by the availability parameter.
h(v) = π/2 · v / (vm2) · exp (-π/4·(v/vm)2)
cp = 2 · Pel / (ρ · Arotor · v3)
Pm = ηFeld · ηV · Σi ( P(vi) · h(vi) )
Ea = Pm · 8760 h
Full load hours:
hfull load = Pm / Pnenn · 8760 h
Attention: This performance analysis is only a rough estimation that cannot replace a detailed planning and analysis. No responsibility is taken for the correctness of this information.
Detailed information about the calculation and simulation of wind energy converters can be found in the specialists book Understanding Renewable Energy Systems .