  The power generation with non-renewable energy sources has very harmful
effects on the environment as well as these sources are depleting. On the other
side the renewable energy sources are quite unpredictable source of power. The
best trade-off is to use the combination of both kind of sources to make a
hybrid system so that their individual power generation constraints can be
overcome. The hybrid system taken for analysis in this work comprises of wind
and diesel power generation systems. The complete modelling of the system has
been done in MATLAB/SIMULINK environment. Doubly fed induction generator (DFIG)
is used for power generation in wind power system. The modelling has been done
considering the changing wind speed and varying load conditions. The
mathematical models of DFIG and diesel power generator have been used to
develop the simulink model which can be used for analysis of various
performances of the system like frequency response and power sharing between
different sources with load variation .The generating margin of DFIG is also
simulated for the frequency support during varying load conditions .The
generating margin is created by the control of active power output from DFIG.
Also as the power demand rises the generating margin of DFIG keeps the balance
between the power generation and load. Proportional Integral controller has
been used for diesel generator plant for frequency control. The controller
gains have been optimized with Particle Swarm Optimization technique. The
proper selection of controller gains and wind power reserve help to achieve the
enhanced frequency response of the hybrid system.
