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Research Article

Performance improvement of reconfiguration strategies in photovoltaic array by replacement of blocking diodes with MOSFETs

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Received 28 Jul 2023, Accepted 29 Aug 2023, Published online: 04 Sep 2023
 

ABSTRACT

The power from photovoltaic array (PVA) is affected by temperature, solar irradiation, dust concentration, wind velocity, photovoltaic array configuration (PVAC) and shading pattern. The problem of partial shading (PS) is recognized as a major concern which decreases the PVA output power and represents multiple peak power points in the PV characteristic. Different PVACs respond differently with regard to their mismatch power loss (MPL) and fill factor (FF) under partial shaded condition (PSC). The conventional PVACs, such as SP-diode (Series-Parallel), TCT-diode (Total-Cross-Tied), BL-diode (Bridge-Link) and HC-diode (Honey-Comb), use blocking diodes (B-diodes) to block the reverse current. On the other hand, the proposed PVACs, including SP-MOSFET, TCT-MOSFET, BL-MOSFET and HC-MOSFET, replace the B-diodes with Blocking P-MOSFETs (BP-MOSFETs). The improvement in power output of the PVA is examined for four different configurations with B-diode and BP-MOSFET under changing illumination conditions. It is observed that TCT-MOSFET configuration shows better performance with least power losses and maximum efficiency under PSCs.

List of symbols

Iph=

Solar generated current of each PV cell

Rse=

Series resistance

Rsh=

Shunt resistance

Ic, Vc=

PV cell output current and voltage

I0=

Reverse saturation current of diode

T=

Junction temperature of diode

=

Ideality constant of diode

q=

Electron charge

k=

Boltzmann’s constant

ns, np=

Series and parallel connected PV cells

Vocc, Iscc=

PV cell open circuit voltage and short circuit current

Vocp, Iscp=

PV panel open circuit voltage and short circuit current

Vp, Ip=

PV panel voltage and current

Ns, Np=

Number of series and parallel connected PV panels

V, I=

PV array voltage and current

Voc, Isc=

PV array open circuit voltage and short circuit current

Ip=

PV panel current

GSTC=

Irradiance value at STC

Ip,STC=

PV panel current at STC

Vpn=

PV voltage of nth row of PV array

Pmpp=

Global peak power at uniform irradiance

Pmpp,ps=

Global peak power under partial shading

List of abbreviations

PV=

Photovoltaic

PVC=

PV cell

PVM=

PV module

PVA=

PV array

PVAC=

PVA configuration

PS=

Partial shading

MPL=

Mismatch power loss

FF=

Fill factor

PSC=

Partial shaded condition

SP=

Series-parallel

HC=

Honey-comb

BL=

Bridge-link

TCT=

Total-cross-tied

MOSFET=

Metal-oxide semiconductor field effect transistor

B-diode=

Blocking diode

B-MOSFET=

Blocking MOSFET

MPP=

Maximum Power Point

SBHT=

SP, BL, HC, TCT

OCV=

Open circuit voltage

SCC=

Short circuit current

SC=

Shading case

GMPP=

Global MPP

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Swati Gautam

Swati Gautam is pursuing her post-graduation in Power System Engineering from School of Electrical, Electronics and Communication Engineering, Galgotias University, G. Noida. Her research interests include Power Systems and Renewable Energy Technologies.

Gitanjali Mehta

Gitanjali Mehta received her B. Tech degree from IET, Bareilly, M. Tech degree in Power Electronics and ASIC Design from MNNIT Allahabad and Ph.D. degree from Department of Electrical Engineering, Indian Institute of Technology, Roorkee. Presently, she is working as Professor in the Power Electronics Division of School of Electrical, Electronics and Communication Engineering, Galgotias University, G. Noida. Her research interests include Power Electronics, Renewable Energy Technologies, Grid-integration of Distributed Energy Resources etc.

Shahroz Anjum

Shahroz Anjum received her B. Tech degree in Electrical Engineering from College of Engineering, Roorkee and her M. Tech degree in Power Systems from Thapar University. Presently she is pursuing Ph. D from Department of Electrical Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India. Her research interest includes power system optimization and renewable energy technologies.

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