This
paper presents a modeling and control strategies of a grid connected
Wind-Photovoltaic hybrid system. This proposed system consists of two renewable
energy sources in order to increase the system efficiency. The Maximum Power
Point Tracking (MPPT) algorithm is applied to the PV system and the wind system
to obtain the maximum power for any given external weather conditions. The generator
side converter is controlled by the Field Oriented Control (FOC). This approach
is used to control independently the flux and the torque by applying the d- and
q-components of the current motor. The utility grid side converter is
controlled by the Voltage Oriented Control (VOC) strategy which is adopted to
adjust the DC-link at the desired voltage. The simulation results using PSIM
software environment prove the good performance of these used techniques to
generate sinusoidal current waveforms. This current is synchronized with the
grid voltage. Moreover, the DC bus voltage is perfectly constant because only
the active power is injected into the grid. Simulations are carried out to validate
the effectiveness of the proposed system methods.
KEYWORDS
1. Converter
2. FOC
3. Grid
4. hybrid
system
5. MPPT
control
6. photovoltaic
system
7. SCIG
8. VOC
9. Wind
turbine
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM
Fig.
l.The proposed PV -wind hybrid system
Fig.
2 Solar irradiance changes
Fig.
3 The variation of PY arrays current
Fig.
4 The PY arrays voltage
Fig.
5 The PY arrays power and reference
Fig.
6 Duty cycle
Fig.
7 Wind speed profile
Fig.
8 Electrical angular speed of the SCIG and its reference
Fig.
9 The active power injected into the grid
Fig.
10 The Reactive power injected into the grid
Fig.
11 The waveforms of the current
Fig.
12 The three phase current and voltage waveforms
Fig.
13. DC link voltage.
CONCLUSION
In
this paper, Wind-Photo voltaic hybrid system control has been investigated. An
MPPT method has been studied. It has been simulated with different solar
irradiation and wind speed environments in order to maximize the output power
of the proposed system . Two control techniques have been employed to improve the
hybrid system usefulness . The controlled rectifier connected to the
squirrel-cage induction generator (SCIG) has been controlled by the Field
Oriented Control (FOC) to reach the optimal rotational speed, The grid-side
inverter has been controlled by the Voltage Oriented Control (VOC) method to keep
the dc-link voltage at the desired value. The hybrid system simulation has been
implemented in PSIM software and its performances were proved when the solar
irradiance change or the wind speed occurs.
REFERENCES
[1]
Liyuan Chen, Yun Liu "Scheduling Strategy of Hybrid Wind Photovoltaic- Hydro
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[2]
Akhilesh P. Pati!, Rambabu A. Vatti and Anuja S. Morankar," Simulation of
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Trends in Electrical and Electronics (lJETEE), Vol. 10, Issue. 3, April-2014.
[3]
Rabeh Abbassi, Manel Hammami, Souad Chebbi. "Improvement of the
integration of a grid connected wind-photovoltaic hybrid system"
Electrical Engineering and Software Applications (lCEESA), International
Conference , 2013
[4]
Harini M., Ramaprabha R. and Mathur B. L. "Modeling of grid connected
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[5]
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