advances in wind energy conversion technology pdf

The next chapter analyses the wind turbine loads under varying operating
con-ditions. A general description of the origin of the loads is first presented to
create the basis for the following load assessment methods and procedures. The
design and certification perspectives of wind turbines are emphasized while
developing this analysis.

The major characteristics, objectives and strategies of the control system of a
wind turbine are described in the sixth chapter. Control strategies to attain
effi-cient, stable and reliable operation of modern wind turbines are described and
the classical control loops for the systematic regulation of the critical operating
vari-ables are analysed. A dynamic model describing the dominant characteristics
of a wind turbine is then introduced.

The seventh chapter discusses the basic issues in integrating the bulk power
available from the offshore wind farms with the electrical grids. The basic
re-quirements for the grid integration are first explained and various grid
connection methods like HVAC, LCC HVDC and VSC HVDC are described.
Alternate inte-gration strategies are also explored and at the end, various grid
integration meth-ods are compared.

The last chapter of the book is devoted to the small wind turbines. The large and
small systems are differentiated with respect to their design and operational
requirements. Emphasis is given on the starting performance, yaw behaviour,
gy-roscopic loads, over speed protection and control requirements.

The chapters of this book are contributed by experts working on different
aspects of wind energy conversion technology. We would like to thank them for
sharing their expertise with the readers through this project.