ABSTRACT:
The
presence of harmonics in solar Photo Voltaic (PV) energy conversion system
results in deterioration of power quality. To address such issue, this paper
aims to investigate the elimination of harmonics in a solar fed cascaded _fteen
level inverter with aid of Proportional Integral (PI), Arti_cial Neural Network
(ANN) and Fuzzy Logic (FL) based controllers. Unlike other techniques, the
proposed FLC based approach helps in obtaining reduced harmonic distortions
that intend to an enhancement in power quality. In addition to the power
quality improvement, this paper also proposed to provide output voltage
regulation in terms of maintaining voltage and frequency at the inverter output
end in compatible with the grid connection requirements. The simulations are
performed in theMATLAB / Simulink environment for solar fed cascaded 15 level
inverter incorporating PI, ANN and FL based controllers. To exhibit the
proposed technique, a 3 kWp photovoltaic plant coupled to multilevel inverter
is designed and hardware is demonstrated. All the three techniques are
experimentally investigated with the measurement of power quality metrics along
with establishing output voltage regulation.
KEYWORDS:
1.
Harmonics
2.
intelligent
control
3.
multilevel
inverter
4.
photo voltaic's
5.
power quality
6.
voltage regulation.
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
FIGURE 1. Fuzzy logic control structure.
FIGURE 2. Variation of output voltage with respect of irradiance.
FIGURE 3. Fifteen level output voltage with variable irradiance.
FIGURE 4. Regulated fifteen level output voltage with PI controller.
FIGURE 5. FFT analysis for PI
based voltage regulation.
FIGURE 6. Regulated fifteen level output with ANN based controller.
FIGURE 7. FFT analysis for ANN based voltage regulation.
FIGURE 8. Regulated fifteen level
output voltage with FLC.
FIGURE 9. FFT analysis for FLC based voltage regulation.
CONCLUSION:
The
voltage regulation topology along with power quality improvement is considered
and implemented both in simulation and experimental setup for a solar fed 15
level inverter. While considering the results, it is found that FLC presents better
results for VR while considering the variations at the input solar PV. Despite
this, FLC is considered for the nine-level by [23], but the implementation is
carried out with the DC power supplies without utilizing the solar panels. All the
other methods are implemented for low power and lesser levels of MLI topology.
Commercial utilization of MLI by providing the constant output voltage is
investigated, and the experimental results prove the effectiveness of the
proposed system. The method is applicable for the users require grid interaction
along with the power quality improvement.
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