فهرست مطالب

Journal of Solar Energy Research
Volume:4 Issue: 4, Autumn 2019

  • تاریخ انتشار: 1398/07/09
  • تعداد عناوین: 6
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  • Farhad Barati *, Ali Mazaheri, Majid Jamil Pages 229-236
    Photovoltaic (PV) inverters, as the key technology for integrating PVs into the grid, are increasingly gaining importance. They are manufactured from a few kW for a single inverter to tens of kW for a number of inverters operating in parallel. The two-level three-phase topology is the basic topology for such inverters. It produces lots of harmonics which necessitates significant suppressions prior to be connected to the grid. The LCL filter is known as an effective topology in significantly attenuating harmonics with small filter components. In this paper, we propose a simulation-aided design for the LCL filter to be employed in grid-interactive PV inverters. Starting from some initial values for the filter parameters, the proposed approach imposes analytical as well as simulation constraints. Simulations, performed in Matlab/Simulink, are repeated as long as the Total Harmonics Distortions (THD) in the injected current to grid reaches its limit, i.e. THD =5%. As a design goal, attempts are made to reduce inductors’ sizes, since they are voluminous and sources for Electromagnetic Interferences (EMI).Simulations are provided both for the inverter mode in which some active power is injected to the grid and for the active rectifier mode in which some active power is absorbed from the grid.
    Keywords: PV, Grid-Interactive Inverters, LCL filter, Simulation-Aided Design
  • Faramarz Fadaee, Amir Ebrahimi-Moghadam, Paria Ildarabadi * Pages 237-251
    The optimal use of daylight in interior spaces of residential buildings leads to increase in space quality, comfort condition and optimal energy consumption. Present study investigates the daylight distribution aiming to reach the people’s comfort condition and optimal electrical energy consumption of artificial lighting. For this reason, a zone from each orientation of Yas residential building (located at Mashhad city of Iran) was selected and light analysis was conducted in the interior environment for the baseline condition as well as 7 proposed light shelves (vertical light shelf for East and West orientations, horizontal light shelf for North and South orientations). Measurement criterion for daylight quality is Daylight Autonomy (DA) which a DA of 50% provides the amount of 300 lux light in the interior environment. Then, the amount of saving in lighting electrical energy, which consumes by the lamps during the day, was calculated considering the optimal light shelves. Results show that light shelf No. 3 provides the optimal comfort condition in zone A (west) and light shelf No. 2, No. 4 and No. 6 provide the optimal comfort condition in zone C (North) while the light shelf No. 5 is able to control some the light entering the zone D (East). In addition, considering the light shelves in the studied zones, the electrical energy consumption of the lamps reduced by 576.048 kWh/year.
    Keywords: Building, Daylight, Solar energy, Light shelf, Energy consumption
  • Navid Ghaffarzadeh *, Ahmad Azadian Pages 252-272
    The renewable energy industry is growing faster than ever before and in particular solar systems have significantly expanded. Abnormal conditions lead to a reduction in the maximum available power from solar (photovoltaic) systems. Thus, it is necessary to identification, detection, and monitoring of various faults in the PV system that they are the key factors to increase the efficiency, reliability, and lifetime of these systems. Up to now, faults on PV components and systems have been identified; some of them have physical damage on PV systems and some of them are electrical faults that occur on the DC side or AC side of the PV system. Here, the faults will be divided into groups based on their location of occurrence. This paper provides a comprehensive review of almost all PV system faults and fault detection techniques of PV system proposed in recent literature.
    Keywords: Solar System, PV, DC & AC Side Faults, PV Systems Faults, Fault Detection Technique
  • Mahdi Shakouri, Hossein Ghadamian, Alireza Noorpoor * Pages 273-279
    In this paper, quasi-dynamic analysis of a building integrated photovoltaic (BIPV) system has been investigated by using data mining for a simulated case study. To cover the aim of this research, practical generated energy, power conversion efficiency, energy efficiency and exergy efficiency have been analysed as key performance indicators for evaluation of system dynamics. Results of data analytics can be usefully applied to investigate the performance of system in real conditions of operation in compare to the results of models.
    Keywords: Building integrated photovoltaic, Energy, exergy efficiency, Data analytics
  • Amir Hossein Shiravi *, Mohammad Firoozzadeh Pages 280-286
    Nowadays, environmental protection and efforts to reduce pollution, caused by industrial activities, on one hand, and research on finding new and improved energy supply options on the other, have become one of the major concerns of governments around the world. In recent years, photovoltaic (PV) systems, due to their proved potential are rapidly developed in most parts of the earth. The objective of this study, is to estimate the amount of CO2 emission reduction by implementing a 7 MW PV power plant. The location of this power plant is in the north of Hamedan province, Iran. Moreover, the amount of not consumed fossil fuel were measured. Finally, it is found that the total reduction of 134050 t CO2 will be achieved when PV power plant is used compared to a natural gas one, during 25 years. Moreover, in this paper, the energy payback time (EPBT) and the Energy Yield Ratio (EYR) are calculated. The results show that EPBT is about 5.5 years and EYR of mentioned PV power plant is more than 4.2.
    Keywords: environment, Photovoltaic, Energy Payback Time, Energy Yield Ratio, PV, CO2 emission
  • Mohamadreza Samadi *, Seyed Mehdi Rakhtala, Morteza Ahmadian Alashti Pages 287-299
    Renewable energy generation has experienced lot growth in the last not many years, with close to several billion dollars financing in 2017. Selection of an appropriate converter is one of the challenges since it has an impact on the behavior of the PV (photovoltaic) system. In recent years, many converters have been reported in the literature. This paper presents a review of non-isolated DC-DC converters of voltage enhancers. Relevant review details are presented about the topologies of converters, including boost, hybrid boost, three-level boost, multi-level boost, and three-level hybrid converters that are most commonly used in photovoltaic systems. In the end, there are also several voltage level enhancers that can replace the converters provided in photovoltaic systems. Finally, a comparison is made between the converters in terms of the number of elements used in the circuit and the complexity of controlling the switches in the converters with their advantages and disadvantages being presented in a table. Since the use of multi-level boost converters reduces the switch voltage stress, weight, and cost compared to the conventional mode and as they are also better at higher powers, they have been used significantly in different systems.
    Keywords: Photovoltaic, Boost Converter, hybrid boost, multi-level boost, voltage multiplier converters