Research Papers

A Single Stage Photovoltaic Inverter With Common Power Factor Control and Maximum Power Point Tracking Circuit

[+] Author and Article Information
R. Sridhar, S. S. Dash, Varun Avasthy

Department of Electrical and
Electronics Engineering,
SRM University,
Chennai 603203, India

K. C. Jayasankar

Department of Electrical and
Electronics Engineering,
Prathyusha Institute of
Technology and Management,
Chennai 602025, India

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received April 9, 2013; final manuscript received August 24, 2013; published online November 26, 2013. Assoc. Editor: Santiago Silvestre.

J. Sol. Energy Eng 136(2), 021020 (Nov 26, 2013) (7 pages) Paper No: SOL-13-1115; doi: 10.1115/1.4025515 History: Received April 09, 2013; Revised August 24, 2013

This paper presents a unique approach towards the reduction of steps employed in conversion of power produced by a photovoltaic energy system. When a Photovoltaic system feeds an ac load, the power conditioning system of a Photovoltaic energy conversion system consists of a boost converter at the first stage to boost up the direct current (dc) supply, and an inverter to convert this boosted supply to alternating current (ac) at the second stage. But in this conventional system, losses happen at both the stage which makes the whole system to have low efficiency. The proposed approach in this paper has only one stage conversion. In this single step conversion the direct current supply is boosted and converted to alternating current with the help of a single inverter circuit. This process of power conditioning is carried out with respect to the load connected as well to the maximum power with respect to the variant irradiation and temperature condition. The load connected to the system is tested under varying environmental conditions of the photovoltaic system. Nature of output power from the system is studied by varying the irradiation and temperature of the photovoltaic array.

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Fig. 1

Block diagram of conventional power conditioning system

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Fig. 8

System parameters for irradiation 800 W/m2: (a) PV array output voltage, (b) dc capacitor voltage, (c) inverter output voltage and current in same phase, (d) inverter output current reduced to 8 A, and (e) maximum power point calculated per cycle 150.7 W

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Fig. 9

(a) PV array voltage and (b) maximum power point peak varying due to changing irradiation

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Fig. 7

System parameters for irradiation at 1000 W/m2: (a) PV array voltage Vpv, (b) dc capacitor voltage Vc, (c) inverter output voltage and current, and (d) maximum power point calculated for every cycle of operation

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Fig. 6

Block diagram of SSC with one cycle control

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Fig. 5

Block diagram of one cycle with MPPT controller

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Fig. 4

Feed forward network in voltage source inverter control

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Fig. 3

Boost converter circuit diagram

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Fig. 2

P–V characteristics of solar array

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Fig. 10

(a) PV voltage versus irradiation curve and (b) maximum power point versus PV voltage curve

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Fig. 11

(a)–(d) Pulse waveform of four switches of single stage inverter

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Fig. 12

(a) Experimental result of capacitor (C) voltage, (b) output voltage (80 V) of inverter at irradiation 800 W/m2, and (c) output voltage (106 V) of inverter at irradiation 1000 W/m2



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