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    Design and implementation of a solar plant and irrigation system with remote monitoring and remote control infrastructures
    (Pergamon-Elsevier Science Ltd, 2016) Kabalci, Yasin; Kabalci, Ersan; Canbaz, Ridvan; Calpbinici, Ayberk
    One of the most prominent applications of solar plants is the solar pumping systems that are required in rural areas while it is almost impossible to connect to the utility grid. A solar plant and irrigation system with several control features are designed and implemented in this study. The technical aspects of the study include sizing of a solar plant, feasibility analyses, system planning and implementation, remote monitoring, and remote control issues. The sizing and feasibility analyses are performed by using highly reliable software. The remote monitoring system is implemented with several sensing and communication boards designed by authors, and server-client software. The remote control operation is performed owing to implemented 8-channel relaying device that is reached over GSM networks. Each part of the entire system is implemented and is optimized to provide an observable and controllable solar irrigation system in a county yard. The presented study is aimed to express the potential capabilities of a solar plant in irrigation, and integration capabilities to numerous communication systems such as 3G, GSM, and Wi-Fi to implement remote monitoring and remote control infrastructures. (C) 2016 Elsevier Ltd. All rights reserved.
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    Single phase multilevel string inverter for solar applications
    (Institute of Electrical and Electronics Engineers Inc., 2015) Kabalci, Ersan; Kabalci, Yasin; Canbaz, Ridvan; Gokkus, Goksel
    The proposed study deals with modeling and implementation of a multilevel string inverter with non-isolated DC-DC converter design. The modeled system is intended to be used for solar applications that the photovoltaic panels are connected in string structure. However, the DC-DC converter and multilevel inverter are capable to be used in distributed energy generation applications owing to the proposed control infrastructure. The entire design includes dual buck converter at the dc coupling input where both of the converters simultaneously operate to regulate photovoltaic string voltages. Each dc converter is capable to manage a string comprised of two photovoltaic arrays at the input. The maximum power of each solar array is allowed to be 1.2 kWp while the maximum value of total input power is limited to 4.8 kWp regarding to the related international standards such as AS4777-2013, IEC62109, and IEC61727. The output voltages of dc converters are set to 120V by the proportional-integral controller and are coupled over dc busbar to supply 9-level string inverter. The multilevel string inverter is comprised of two H-bridges in symmetrical topology where it is arranged according to regular 5-level symmetrical inverter. Furthermore, the regular sinusoidal pulse width modulator is enhanced to increase voltage level of inverter to nine instead of regular 5-level output. The inverter provides unity power factor with 0.63% total harmonic distortion ratio. © 2015 IEEE.