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Technical Brief

A Comprehensive Modeling of Grid-Connected Photovoltaic Systems Using Multiphase Converter Based on Reliability Concepts

[+] Author and Article Information
Marzieh Piri

Department of Electrical Engineering,
University of Isfahan,
Isfahan 81746-73441, Iran
e-mail: piri.marzieh@eng.ui.ac.ir

Mehdi Niroomand

Department of Electrical Engineering,
University of Isfahan,
Isfahan 81746-73441, Iran
e-mail: mehdi_niroomand@eng.ui.ac.ir

Rahmat-Allah Hooshmand

Department of Electrical Engineering,
University of Isfahan,
Isfahan 81746-73441, Iran
e-mail: hooshmand_r@eng.ui.ac.ir

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received May 20, 2016; final manuscript received June 2, 2017; published online August 22, 2017. Assoc. Editor: Geoffrey T. Klise.

J. Sol. Energy Eng 139(5), 054502 (Aug 22, 2017) (5 pages) Paper No: SOL-16-1232; doi: 10.1115/1.4037377 History: Received May 20, 2016; Revised June 02, 2017

This paper proposes a new method based on a Markov model to calculate the reliability of grid-connected photovoltaic (PV) systems. This system is a grid-connected PV system consisting of PV modules, a multiphase DC–DC converter, an inverter, an inverter controller, and an maximum power point tracking (MPPT) controller at University of Isfahan. This system is considered repairable. Also, different levels of operation are considered for the system equipment. Reliability of the PV modules, the multiphase DC–DC converter, and the inverter has been calculated by the Markov model. Finally, the reliability of the entire PV system is calculated by the Markov model. The proposed algorithm is applied to the PV system positioned at University of Isfahan. Simulation results show the applicability of this method for calculating the reliability of grid-connected PV systems.

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References

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Figures

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Fig. 1

Block diagram of grid-connected PV system in University of Isfahan

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Fig. 2

Three-phase interleaved boost converter

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Fig. 3

Single-phase full-bridge inverter topology

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Fig. 4

Simplified state-transition diagram of the panels set

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Fig. 5

State transition diagram of the three-phase converter

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Fig. 6

Simplified state-transition diagram of the three-phase converter

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Fig. 7

Simplified state-transition diagram of the system

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Fig. 8

Reliability of panels set as a function of one panel's failure rate

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Fig. 9

(a) Converter reliability as a function of switch failure rate and (b) converter reliability as a function of switch repair time

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Fig. 10

(a) Inverter reliability as a function of switch failure rate and (b) inverter reliability as a function of capacitor failure rate

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Fig. 11

System reliability as a function of failure rate and repair time of its components

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