Technical Brief

Reduction of Voltage Harmonics in Solar Photovoltaic fed Inverter of Single Phase Stand Alone Power System

[+] Author and Article Information
S. Albert Alexander

Assistant Professor (Senior Grade)
Department of Electrical and Electronics Engineering,
Kongu Engineering College,
Perundurai, Erode,
Tamilnadu 638 052, India
e-mail: ootyalex@gmail.com

Manigandan Thathan

P. A. College of Engineering and Technology,
Pollachi, Coimbatore,
Tamilnadu 642 002, India
e-mail: manigandan_t@yahoo.com

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received September 27, 2013; final manuscript received March 11, 2014; published online May 13, 2014. Assoc. Editor: Santiago Silvestre.

J. Sol. Energy Eng 136(4), 044501 (May 13, 2014) (4 pages) Paper No: SOL-13-1280; doi: 10.1115/1.4027267 History: Received September 27, 2013; Revised March 11, 2014

In this paper, an optimal harmonic stepped waveform (OHSW) method is proposed to reduce the voltage harmonics available at the output of solar photovoltaic (SPV) fed fifteen level cascaded multilevel inverter (CMLI). This technique is used to solve the harmonic elimination equations based on stepped waveform analysis in order to obtain the optimal switching angles. The OHSW method considers the output voltage waveform as four equal symmetries in each half cycle and the magnitude of six numbers of harmonic orders is reduced. Simulations are carried out in Matlab/Simulink and a 3 kWp solar plant is implemented in hardware to show the effectiveness of the proposed system.

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Grahic Jump Location
Fig. 1

Fifteen level solar fed CMLI

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Fig. 2

Seven stage fifteen level output voltage waveform

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Fig. 3

Quarter wave symmetry waveform for 15 levels

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Fig. 4

Fifteen level output voltage waveform with OHSW

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Fig. 5

FFT Analysis for the output waveform with OHSW

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Fig. 6

Comparison graph for harmonic order magnitudes

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Fig. 8

Output voltage waveform and FFT analysis



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