ABSTRACT
This paper investigates dynamic modeling, design and control strategy of
a grid-connected photovoltaic (PV)/wind hybrid power system. The hybrid power
system consists of PV station and wind farm that are integrated through main
AC-bus to enhance the system performance. The Maximum Power Point Tracking
(MPPT) technique is applied to both PV station and wind farm to extract the
maximum power from hybrid power system during variation of the environmental
conditions. The modeling and simulation of hybrid power system have been implemented
using Matlab/Simulink software. The effectiveness of the MPPT technique and
control strategy for the hybrid power system is evaluated during different
environmental conditions such as the variations of solar irradiance and wind
speed. The simulation results prove the effectiveness of the MPPT technique in
extraction the maximum power from hybrid power system during variation of the
environmental conditions. Moreover, the hybrid power system operates at unity
power factor since the injected current to the electrical grid is in phase with
the grid voltage. In addition, the control strategy successfully maintains the
grid voltage constant irrespective of the variations of environmental
conditions and the injected power from the hybrid power system.
KEYWORDS
1.
PV
2.
Wind
3.
Hybrid system
4.
Wind turbine
5.
DFIG
6.
MPPT control
SOFTWARE: MATLAB/SIMULINK
CONCLUSION
In this
paper, a detailed dynamic modeling, design and control strategy of a
grid-connected PV/wind hybrid power system has been successfully investigated.
The hybrid power system consists of PV station of 1MW rating and a wind farm of
9 MW rating that are integrated through main AC-bus to inject the generated
power and enhance the system performance. The incremental conductance MPPT
technique is applied for the PV station to extract the maximum power during
variation of the solar irradiance. On the other hand, modified MPPT technique
based on mechanical power measurement is implemented to capture the maximum
power from wind farm during variation of the wind speed. The effectiveness of the MPPT techniques and
control strategy for the hybrid power system is evaluated during different environmental
conditions such as the variations of solar irradiance and wind speed. The
simulation results have proven the validity of the MPPT techniques in
extraction the maximum power from hybrid power system during variation of the
environmental conditions. Moreover, the hybrid power system successfully
operates at unity power factor since the injected reactive power from hybrid
power system is equal to zero. Furthermore, the control strategy successfully
maintains the grid voltage constant regardless of the variations of environmental
conditions and the injected power from the hybrid power system.
REFERENCES
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