Due to the benefits of wind power in the ecological
enhancement, energy cost reduction and energy security, the use
of wind power is spreading. In this paper, the impact of wind power
on the dynamic stability of weakly interconnected power systems is
considered. Two situations are covered. The first one is the
replacement of conventional power by wind power while the
second one includes the addition of wind power to an existing
conventional power generation system. The considered system is
composed of two weakly interconnected areas. The objectives of
wind power are to reduce the dependency between the two areas
and the reduction of conventional fuel use while keeping
acceptable damping levels. Two popular wind energy technologies
are considered which are fixed speed SCIGs and the variable speed
DFIGs. The results show that the wind power causes reduction in
the damping of power system oscillations. Therefore, power
oscillation damping controllers (POD) are integrated with the
available SVCs. These POD controllers are designed for
improving the system dynamic stability to an acceptable level. The
POD design is based on the frequency response method. The
modal analysis and the time-domain simulation are used for
validating the POD efficient design. |
