پروژه های مهندسی برق

دانلود پایان نامه دکتری 

زبان : انگلیسی

سال انتشار :  2014

در زمینه : مهندسی برق 

کد محصول : 1206

تعداد صفحات : 160

قیمت :20000 تومان

توضیحات : ندارد

چکیده انگلیسی :

This work presents a new control strategy using fractional order operators in threephase
grid-connected photovoltaic generation systems with unity power factor for any situation
of solar radiation. The modeling of the space vector pulse width modulation inverter
and fractional order control strategy using Park’s transformation are proposed. The system
is able to compensate harmonic components and reactive power generated by the loads
connected to the system. A fractional order extremum seeking control and “Bode’s ideal
cut-off extremum seeking control” are proposed to control the power between the grid and
photovoltaic system, to achieve the maximum power point operation. Simulation results are
presented to validate the proposed methodology for grid-connected photovoltaic generation
systems. The simulation results and theoretical analysis indicate that the proposed control
strategy improves the efficiency of the system by reducing the total harmonic distortion of
the injected current to the grid and increases the robustness of the system against uncertainties.
Additionally, the proposed maximum power point tracking algorithms provide more
robustness and faster convergence under environmental variations than other maximum
power point trackers.

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