ABSTRACT:
The
potential for utilizing clean energy technologies in Egypt is excellent given
the abundant solar irradiation and wind resources. This paper provides detailed
design, control strategy, and performance evaluation of a grid-connected
large-scale PV/wind hybrid power system in Gabel El-Zeit region located along
the coast of the Red Sea, Egypt. The proposed hybrid power system consists of
50 MW PV station and 200 MW wind farm and interconnected with the electrical
grid through the main Point of Common Coupling (PCC) busbar to enhance the system
performance. The hybrid power system is controlled to operate at the unity
power factor and also the Maximum Power Point Tracking (MPPT) technique is
applied to extract the maximum power during the climatic conditions changes.
Modeling and simulation of the hybrid power system have been performed using
MATLAB/SIMULINK environment. Moreover, the paper presented a comprehensive case
study about the realistic monthly variations of solar irradiance and wind speed
in the study region to validate the effectiveness of the proposed MPPT
techniques and the used control strategy. The simulation results illustrate
that the total annual electricity generation from the hybrid power system is 1509.85
GWh/year, where 118.15 GWh/year (7.83 %) generates from the PV station and
1391.7 GWh/year (92.17%) comes from the wind farm. Furthermore, the hybrid
power system successfully operates at the unity power factor since the injected
reactive power is kept at zero.
KEYWORDS:
1. PV
2. wind
3. hybrid
system
4. Gamesa
G80
5. Gabel
El-Zeit
6. Egypt
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
FIGURE 1. Configuration of the proposed PV/wind hybrid system.
FIGURE 2. PV array side results.
FIGURE 4. Dynamic performance of the PV station at the B1-bus.
FIGURE 5. Gamesa wind turbine results
FIGURE 7. Performance of the hybrid system at the PCC bus.
This
paper presented the detailed design, control strategy, and performance analysis
of 250 MW grid-connected PV/wind hybrid power system in Gabel El-Zeit region,
Egypt. This area is characterized by a good level of solar irradiation with an
annual average value of 199.75 kWh/m2 and powerful wind speed with an average
value of 14.08 m/s at 60 m hub height. The proposed hybrid power system
consists of 50MW PV station based Sanyo HIP-200B PV module and 200 MW wind farm
based Gamesa G80 wind turbine and it is inte- grated with the grid through the
main PCC bus to support the system performance. The hybrid power system is
adjusted to work at the unity power factor and also the MPPT algorithms are
applied to capture the optimum power from the hybrid system under the changes
of climatic conditions. Adaptive InCond MPPT technique based variable step-size
is applied to the boost converter to extract the maximum power from the PV
station during the solar irradiance variation. On the other hand, a modi_ed
P&O MPPT strategy is implemented on the RSC of DFIG to obtain the maximum
power from the wind farm during the change of wind speed.
Moreover,
this paper analyzed the actual monthly changes of solar irradiance and wind
speed in the study area to evaluate the dynamic performance of the hybrid
system and validate the ef_ciency of the proposed MPPT techniques and the
control systems. The simulation results have illustrated that the proposed
InCond MPPT algorithm tracks accurately the MPPs, where the PV station power
increases signi_cantly from 8.9MWin January to its maximum value (17.9 MW) in June,
then it falls drastically to the minimum value of 8.2MW in December. Also, the
DC-link voltage controller of the VSI adjusts successfully the DC-link voltage
at its reference value (500 V) regardless of the solar irradiance variation.
Furthermore,
the proposed P&O MPPT strategy sustains the optimal value of the wind
turbine performance coef_cient, Cp D 0:48, to extract the maximum power
from the wind farm during the change of wind speed. Therefore, the active power
rises dramatically from 127.6 MW in January to the rated value (200 MW) in
June, then it decreases gradually until reaching the minimum value of 112.4MWin
November. Besides, the GSC controller has successfully stabilized the DC-bus
voltage to the desired value (1150 V) regardless of the wind speed change.
Additionally,
the simulation results have shown that the total annual electricity generation
from the hybrid power system is 1509.85 GWh/year, where 118.15 GWh/year (7.83
%) generates from the PV station and 1391.7 GWh/year (92.17%) comes from the
wind farm. Moreover, the control system always maintains the hybrid power
system at the unity power factor as the injected reactive power is kept at
zero. Also, the PCC bus voltage is sustained perfectly constant irrespective of
the changes in climatic conditions and the magnitude of generated active power.
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