Energy for Sustainable Development
The Journal of the International
Energy Initiative
© 2007, International Energy Initiative, Inc.
ISSN: 0973-0826
Volume XII, No.2, June 2008, pp. 27-33
Introducing a new method for optimal sizing of
a hybrid (wind/PV/battery) system considering instantaneous
wind speed variations
M.H. Zamani and G.H. Riahy
Abstract
In hybrid systems
which include wind turbines, calculation of wind turbine power
is based on average wind speed, because considering
instantaneous wind speed makes the design of the hybrid system
complex and practically impossible. In this paper a new method
is presented to determine the optimum generation capacity and
storage needed for a hybrid (wind/PV/battery) system, based on
instantaneous wind speed variations. In this method, the power
curve of the wind turbine is modified on the basis of wind
speed variations. The modified power curve is obtained by
considering the energy pattern factor of actual wind as an
indicator of the wind dynamics and using a new factor called
wind turbine controllability for performance evaluation of the
wind turbine controllers in capturing extra energy. The hybrid
system calculations will be based on this modified power
curve.
Results indicate that by using this method and designing
hybrid systems based on wind dynamics, the power of different
hybrid system components can be calculated more accurately
and, while maintaining the system reliability, there will be a
significant reduction in the investment cost.
Key-words:
energy pattern factor, hybrid system, power curve, variable
speed wind turbine.
