ABSTRACT:
To improve the performance of photovoltaic system a
modified cuk converter with Maximum Power Point Tracker (MPPT) that uses a
fuzzy logic control algorithm is presented in this research work. In the
proposed cuk converter, the conduction losses and switching losses are reduced
by means of replacing the passive elements with switched capacitors. These
switched capacitors are used to provide smooth transition of voltage and
current. So, the conversion efficiency of the converter is improved and the
efficiency of the PV system is increased. The PV systems use a MPPT to continuously
extract the highest possible power and deliver it to the load. MPPT consists of
a dc-dc converter used to find and maintain operation at the maximum power
point using a tracking algorithm. The simulated results indicate that a
considerable amount of additional power can be extracted from photovoltaic
module using a proposed converter with fuzzy logic controller based MPPT
KEYWORDS:
1. Modified Cuk Converter
2. Photovoltaic System
3. Maximum Power Point Tracker
4. Fuzzy Logic Controller
SOFTWARE: MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Figure
1: Simulation diagram for the proposed converter
EXPECTED SIMULATION RESULTS:
(a)
(b)
(c)
Figure
2: Output of Solar Irradiation at 500 watts / m2 (a)
Current,
(b) Voltage, (c) Power
(a)
(b)
(c)
Figure
3: Output of Solar Irradiation at 1000 watts / m2 (a)
Current,
(b) Voltage, (c) Power
CONCLUSION:
The
proposed modified cuk converter was simulated in MATLAB simulation platform and
the output performance was evaluated. Then, the mode of operation of proposed converter
was analyzed by the different solar irradiation level. From that, output
current, voltage and power were considered. For evaluating the output
performance, the proposed modified cuk converter output was tested with PV system.
From the testing results, the output power of the modified converter efficiency
and the efficiency deviation were analyzed. The analyses showed that the
proposed modified cuk converter was better when compared to conventional cuk
converter and boost converter. Experimental setup has been done to prove the
effectiveness of the proposed system.
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