Performance Investigation of
Isolated Wind–Diesel Hybrid Power Systems with WECS Having PMIG
ABSTRACT:
This paper presents the automatic reactive power control
of isolated wind–diesel hybrid power systems having a permanent-magnet
induction generator for a wind energy conversion system and a synchronous
generator for a diesel generator set. To minimize the gap between reactive
power generation and demand, a variable source of reactive power is used such
as a static synchronous compensator. The mathematical model of the system used
for simulation is based on small-signal analysis. Three examples of the
wind–diesel hybrid power system are considered with different wind power
generation capacities to study the effect of the wind power generation on the
system performance. This paper also shows the dynamic performance of the hybrid
system with and without change in input wind power plus 1% step increase in
reactive power load.
KEYWORDS:
1.
Permanent-magnet
induction generator (IG) (PMIG)
2.
Static synchronous compensator (STATCOM)
3.
Synchronous generator (SG)
4.
Wind–diesel hybrid system
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig
1.Single line diagram of an isolated wind–diesel hybrid power system.
CONCLUSION:
Reactive
power control of isolated wind–diesel hybrid power systems has been
investigated when WECS uses PMIG for power generation. The WECSs are
interconnected to diesel generation-based grid for the enhancement of capacity
and fuel saving. The system also comprises STATCOM for reactive power support
during steady-state and transient conditions. A mathematical
model of the system has been derived for investigating the dynamic performance
of the system. For comparison of performance with the existing systems, WECS
has also been considered with IG for power generation. Three examples of
wind–diesel systems with different wind power generation capacities have been
considered for study. It has been observed that the STATCOM effectively
stabilizes the oscillations in less than 0.01 s, caused by disturbances in
reactive power load and in input wind power. As steady-state condition is
reached, the STATCOM provides the additional reactive power required by the
system. It has also been observed that, as the unit size of the wind-power
generation decreases, the value of the optimum gain
setting increases. The W-D systems with PMIG have the added advantage of reduction
in the size of the STATCOM but have comparable transient performance when W-D
system uses IG for power generation. The PMIG also has higher efficiency than
the IG. Therefore, PMIGs are very good options for W-D systems than IG.
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