Solar energy collection and conversion is of great significance to the power transmission of the Space Solar Power Station (SSPS), and has influences on the overall system, technologically and ...economically. For the proposed SSPS-OMEGA concept, the original conceptual design had non-uniform energy distribution and excessive energy density in local areas, which would cause decreases in its optical and electric performance. Aiming at this point, firstly, this paper evaluates the optical performance of the OMEGA concept via ray trace technique. Secondly, the generatrix geometry design of the photovoltaic (PV) cell array based on Bézier curve is carried out to obtain optimal optical performance available for efficient response to sunrays. After that numerical examples achieve good collection efficiency and suitable energy distribution. Finally, modular construction for the main concentrator and its influence on optical performance are investigated. Moreover, the effect of the orbital motion and tracking error are analyzed to provide reference for the realization of the OMEGA.
•Optical performance for the SSPS-OMEGA is analyzed via ray trace technique.•Optimization indicates maximum collection efficiency and uniform distribution.•Increasing the order of Bézier curve will increase the collection efficiency.•Modular strategy for the main concentrator via polygonal mesh is investigated.•The impacts of orbital motion and tracking error are analyzed preliminarily.
This article analyzes the climatic features of the Bukhara region – the southern-eastern part of Uzbekistan. The wind and solar potential of the region and the prospects of its utilization were ...evaluated. In recent years, wind and solar energy has been analyzed worldwide. The potential for the use of solar radiation in the region was analyzed. Accordingly, when the solar photovoltaic batteries in the region are used (coefficient of efficiency-18%), the technical potential of the region is 41 TWh/year. Wind speeds and wind energy potential data were collected over eight years (2011-2018) and were calculated using the monthly wind speed data measured every 30 minutes at a height of 10m. During the estimation of wind energy potential we were used two parameters Weibull and Rayleigh distribution functions. The density power and energy values of the wind flow at various heights were evaluated using the extrapolation method. In accordance with that, on height of 10m it makes 41.19 W/m2 and 361.48 kWh/m2, on height of 50m 117.23 W/m2 1026.96 kWh/m2, and on height of 100m 192.76 W/m2, 1688.59 kWh/m2. The wind energy gross, technical and economic potential of the region has been evaluated. In addition, the potential and prospects of using hybrid (wind and solar) power stations for the supply of uninterrupted and reliable power supply to consumers in the region were analyzed
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This article presents the results of a study of a combined wind–photovoltaic installation for use in the energy sector of the Republic of Iraq. The presented hybrid system is proposed for providing ...energy to utility customers in Iraq and for its energy sector. Iraqi consumers are experiencing a constant shortage of electricity, and the proposed solution for joint generation of energy by wind–solar installations will help solve this problem. The authors show a total increase in the efficiency of the mini-energy complex due to the combined generation of electric energy by converting the wind flow and solar radiation. This study is devoted to the analysis and modeling of a small autonomous hybrid wind–solar energy system. During the study, parameters such as the angle of inclination, rotor diameter, wind speed, etc., were considered. The simulation of the photovoltaic installation is carried out under nominal conditions, such as the temperature of the silicon cell, solar insolation, etc. The MATLAB computer program was used to describe the mathematical models of small horizontal axes of wind turbines and photovoltaic systems. An experimental study was carried out using low power installations. The research results show that when using hybrid wind–solar systems to provide the energy complex in Iraq, the total production of the hybrid installation increases significantly. Moreover, the generation of electric energy by wind and solar installations in different months of the year is different. Those in the summer months, mainly photovoltaic batteries operate, and in the winter months, wind turbines make the main contribution to energy generation. As a result, the joint work of wind and solar installations to generate electrical energy helps to establish more uniform generation throughout the year. Such hybrid systems increase the reliability of the energy complex based on renewable energy sources. The introduction of the presented systems to provide individual consumers seems promising in the field of alternative energy.
The need for application of a device for online remote monitoring of electrical parameters and the operability of photovoltaic converters of solar power plants is justified in the context of the ...problems encountered in the Sevastopol Solar Power Plant (S. Energy Sevastopol LLC) operation. A structural diagram of the device showing the connection and purpose of its main functional components is presented. The circuit is based on an ATmega 328p microcontroller, which transfers processed data from the sensors to the server by sending a GET request using a W5100 Wiznet Ethernet controller. Such a solution allows for a high data transfer rate—up to 25 Mbps—and provides a simple connection to the Internet independently from operating systems and external computers. The characteristics and performance analysis of galvanically isolated sensors used in the device are presented, such as a current sensor based on an Allegro ACS712 integrated current sensor, and a voltage sensor based on the transistor optocoupler. The results of the device operation illustrating the photovoltaic plant daily operation on a sunny fall day are provided. The device provides for continuous monitoring of the operation of the photovoltaic converters with long-term storage of measured values in graphical and numerical form, which makes it possible for operational and dispatching personnel to visually analyze the plant operation, monitor its performance, compare key performance indicators of various sections, and obtain production reports by periods with plotting of curves, as well as receive alarm signals.
The factors influencing the energy system of the Republic of Crimea were studied. Analysis of generating capacity to ensure reliable power supply to consumers and sustainability of the power system ...in different periods of the year was carried out. Research of the renewable energy role in the power system management was conducted, including the improvement of methods of management and optimization of solar power plants capacity. A study of the data necessary to build an optimal model of power system management was performed. Power system efficiency increased in relation to the price of electricity for consumers. We proposed the development of methods to optimize the production of solar power plants, affecting the operation of the Republic of Crimea and the Middle East power systems. Studies have established the dependence of the power system on the changeable generation of renewable energy sources, thereby showing the impact of meteorological factors on the power system operating modes. One of the rational approaches is the use of genetic algorithms to solve the problems of structural-parametric optimization of energy systems modes. It will allow optimizing of the management of the Republic of Crimea power system, including the creation of opportunities for optimal loading of the network, taking into account various specified conditions. The work identified the potential of Iraq’s energy industry for renewable sources, where solar photovoltaic technologies are suitable for the production of electricity throughout Iraq, due to the uniform distribution of solar radiation throughout the country. The results of the work revealed that the result obtained is applicable not only to the power system of the Republic of Crimea, but also to other foreign power systems of the Middle East with a large number of renewable energy sources and the potential construction of new solar power plants, that can make it possible to optimize the power system management.
The solar power stations for energy supply of remote technological processes making requirements to their design have been designed. Energy estimate of power stations design for remote agricultural ...consumers has been made
For a field experiment on microwave power transmission (MPT) which was jointly conducted by the Radio Atmospheric Science Center of Kyoto University, Robe University, and Kansai Electric Power ...Company from 1994 to 1995, we had developed and tested a new type of rectenna (rectifying antenna) based on a circular microstrip antenna (CMA). A square shape of array with an area of 3.2 m/spl times/3.6 m was then constructed using the developed rectennas for experiment. The whole rectenna array is composed of 256 sub-arrays, each with nine rectenna elements. We place the rectenna sub-array with better RF-DC conversion efficiency in the central area of the whole rectenna array. Such spatial optimization is needed because the power density of the microwave beam used in the experiment has a spatial gradient with a peak at the center of the beam. We then examined dependence of the rectenna array characteristics on the electrical connection of the sub-arrays. The difference of the output DC power of the whole array for five different electrical connections is within 5%. The load characteristics, therefore, suffers little change even if the electrical connection of the rectenna sub-array is changed.
This paper proposes an umbrella-type foldable concentrator for the Orb-shape Membrane Energy Gathering Array (OMEGA) space solar power station. This design is inspired by the umbrella-like ...collapsible antenna and is used to achieve a lightweight and highly stowable OMEGA space solar power station. This concentrator is composed of a rigid reflective surface intercepted from the center of the spherical crown and a thin film reflective surface formed by several curved ribs. The analysis of axial error indicates that reducing the concentrator aperture and the number of ribs results in a smaller axial root mean square error. To achieve the required precision of 3.6-5.4 mm, the minimum of 48 ribs is necessary. The number of ribs was reduced to 12 to improve deployment reliability. The solar array profile was optimized to compensate for the error. A crank-like slider mechanism was designed to achieve simultaneous deployment of the array and the thin-film reflective surface. Modal analysis was performed on the concentrator to obtain the inherent frequency required for the design. The resonant frequency of the concentrator can meet the design requirements.
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