editorial solar photovoltaic power...

EditorialSolar Photovoltaic Power Plants

Md. Rabiul Islam,1 Wei Xu,2 Youguang Guo,3 and Ke Ma4

1Rajshahi University of Engineering and Technology, Rajshahi, Bangladesh2Huazhong University of Science and Technology, Wuhan, China3University of Technology Sydney, Ultimo, NWS, Australia4Aalborg University, Aalborg, Denmark

Correspondence should be addressed to Md. Rabiul Islam; [email protected]

Received 23 April 2017; Accepted 24 April 2017; Published 8 June 2017

Copyright © 2017 Md. Rabiul Islam et al. This is an open access article distributed under the Creative Commons AttributionLicense, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work isproperly cited.

In 2014, the global primary energy consumption was12,928.4 million tons of oil equivalent which generates about10,000 million tons of carbon during the burning of fossilfuels. The global energy crisis and environmental degrada-tion problems have led to the rapid development of solarphotovoltaic (PV) power plants to replace conventionalpower plants. Solar PV power plants of more than 10MWin capacity have thereby become a reality. Future solar PVpower plants will have higher power capacity. Indeed, someof them will exceed 1000MW. Up to 2014, about 1600installations worldwide were PV power plants larger than4MW. A 10MW solar PV power plant may save about15,000 tons of CO2 emissions per annum. More than 90%of the installed capacity consists of grid-connected systems.Since multimegawatt PV power plants require large areasof land, they are usually installed in remote areas, far fromcities. For power transmission, a medium voltage networkis commonly used.

The power converter topology, system stability, andcontrol of grid-connected PV power plants have attractedconsiderable interest in recent years, as the existing technol-ogies are not suitable for large-scale PV power plants yet. Inthe last two decades, extensive research has been carriedout in proposing new inverter topologies. Besides the devel-opment of inverter topologies, considerable efforts have alsobeen directed toward the progress of maximum power pointtracking algorithms and grid stability and control, due tothe intermittent nature of solar energy source. In order topush this emerging technology, more research is needed to

solve two enormous challenges, that is, energy and environ-ment by replacing conventional power plants with solar PVpower plants.

We received a total of 21 manuscripts, of which 7 wereselected for publication on various aspects of PV throughthe strict experts’ peer reviews. A brief description and salientresults of the papers to be published in the special issue aregiven below.

The paper “Modeling and Analysis of New MultilevelInverter for Solar Photovoltaic Power Plant” by X. Guoet al. explores a novel five-level inverter for the high-voltagePV power plant applications. The model of the inverter isanalyzed. With the redundant switching states, a new modu-lation strategy is proposed to reduce the common-mode volt-age and electromagnetic interference. O. P. Akkaş et al.’spaper “Optimal Site Selection for a Solar Power Plant in theCentral Anatolia Region of Turkey” describes the criteriafor selecting the appropriate location of solar PV powerplants by the multicriteria decision-making methods. Theresults are evaluated for 5 cities in the central Anatolianregion of Turkey. The paper by C. Mu et al. entitled“Observer-Based Load Frequency Control for Island Micro-grid with Photovoltaic Power” investigated the load fre-quency control of an island microgrid with PV power andelectric vehicles (EVs), where the EVs can be treated asdistributed energy storages. Considering the disturbancesfrom load change and PV power, an observer-based integralsliding mode controller is designed to regulate the frequencyback to the prescribed value, where the neural network

HindawiInternational Journal of PhotoenergyVolume 2017, Article ID 1041375, 2 pageshttps://doi.org/10.1155/2017/1041375

https://doi.org/10.1155/2017/1041375

observer is used to estimate online the PV power. Researchpaper “Synergetic Control of Grid-Connected PhotovoltaicSystems” by J. Qian presents synergetic control for the con-trol of a grid-connected PV system. Modeling of a grid-connected PV system is described, and differential-algebraequations are obtained. Two control strategies are used innormal operation and during low-voltage ride-through of aPV system. Practical synergetic controllers with two controlstrategies are synthesized. The mathematical expressionsare derived for computing control variables. In paper by O.Taşkın et al. entitled “Analysis on Photovoltaic Energy-Assisted Drying of Green Peas”, a PV energy-assisted indus-trial dryer has been tested in various weather and workingconditions. A. Jahid et al.’s paper “PV-Powered CoMP-Based Green Cellular Networks with a Standby Grid Supply”proposes a novel framework for PV-powered cellular net-works with a standby grid supply and essential energy man-agement technique for achieving envisaged green networks.The proposal considers an emerging cellular network archi-tecture employing two types of coordinated multipoint(CoMP) transmission techniques for serving the subscribers.Under the proposed framework, each base station is poweredby an individual PV solar energy module having an indepen-dent storage device. The paper by H. A. Hussein et al. entitled“Improving the Hybrid Photovoltaic/Thermal SystemPerformance Using Water-Cooling Technique and Zn-H2ONanofluid” is devoted to an enhancement of the performanceof PV panel under different operating conditions. A newdesign of active cooling technique is constructed which con-sists of a small heat exchanger and water circulating pipesplaced at the PV rear surface to solve the problem of highheat stored inside the PV cells during the operation.

We hope that this issue will promote new research direc-tions to address the undergoing challenges and technologicalrequirements in solar PV power plants.

Acknowledgments

We would like to take this opportunity to thank all theauthors who are interested in publishing their articles in thisspecial issue. Our specific thanks will be to the editorial boardmembers of this journal; without their help and contribution,this issue will never be concluded in due course.

Md. Rabiul IslamWei Xu

Youguang GuoKe Ma

2 International Journal of Photoenergy

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