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[IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Diffraction by a Truncated Slab Filled by Dielectric Material
摘要： In this paper, the problem of joint multi-pitch and direction-of-arrival (DOA) estimation for multichannel harmonic sinusoidal signals is considered. A spatio-temporal matrix signal model for a uniform linear array is defined, and then the ESPRIT method based on subspace techniques that exploits the invariance property in the time domain is first used to estimate the multi pitch frequencies of multiple harmonic signals. Followed by the estimated pitch frequencies, the DOA estimations based on the ESPRIT method are also presented by using the shift invariance structure in the spatial domain. Compared to the existing state-of-the-art algorithms, the proposed method based on ESPRIT without 2-D searching is computationally more efficient but performs similarly. An asymptotic performance analysis of the DOA and pitch estimation of the proposed method are also presented. Finally, the effectiveness of the proposed method is illustrated on a synthetic signal as well as real-life recorded data.
关键词： ESPRIT,DOA estimation,performance analysis,pitch estimation
更新于2025-09-23 15:19:57
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[IEEE 2020 5th International Conference on Devices, Circuits and Systems (ICDCS) - Coimbatore, India (2020.3.5-2020.3.6)] 2020 5th International Conference on Devices, Circuits and Systems (ICDCS) - Design And Control Strategies of Quasi a?? Z Source Inverter For Photovoltaic Power Generation Systems
摘要： The fast decreasing fossil fuel and emission of carbon dioxide pollution leads the researcher to go with alternative energy resource to utilize the power demand and leads the research in the area of power converters. This research work focused on the maximum utilization of PV systems integrated with quasi z source inverter topology. The z source inverter plays a prominent role in PV fed converter, existing much more topology are derived from z source. A few topologies like quasi z source utilizing less number of passive components. Such topology has copious advantages like, voltage boosting capability, reduced inrush current at startup, which might destroy the devices can be avoided. The research work focus on the design and control strategies of quasi z source inverter with PI and FLC controller. The setup is implemented in Matlab/Simulink and to validate the proposed module a laboratory prototype is modeled and designed with FPGA Spartan 6 with power rated 0.8kW with PV volt of 60V and ac output voltage of 220V.
关键词： PI and FLC controller,Quasi Z source inverter,performance analysis,PV panel
更新于2025-09-23 15:19:57
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Response time of a ternary optical computer that is based on queuing systems
摘要： In this paper, a four-stage service model is constructed by combining M/M/1, M/M/1 and M/M/1 queuing systems. In addition, the immediate scheduling strategy and its algorithm are presented in detail, and the computing accomplished scheduling strategy and its algorithm are proposed. Approaches for computing the receiving time, preprocessing time, operating time and transmission time of operation requests that are based on various queuing systems are discussed, and the response time is calculated by adding these times together. Finally, the response times under the two scheduling strategies are obtained by simulating the models numerically, and the results demonstrate that the proposed computing accomplished scheduling strategy outperforms the immediate scheduling strategy.
关键词： Computing accomplished scheduling,Performance analysis,M/M/1,Immediate scheduling
更新于2025-09-19 17:15:36
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Surface Dust and Aerosol Effects on the Performance of Grid-Connected Photovoltaic Systems
摘要： A large number of grid-connected Photovoltaic parks of di?erent scales have been operating worldwide for more than two decades. Systems’ performance varies with time, and an important factor that in?uences PV performance is dust and ambient aerosols. Dust accumulation has signi?cant e?ects depending the region, and—on the other hand—understanding the role of absorption or scattering in particular wavelengths from aerosols is a challenging task. This paper focuses on performance analysis of a grid-connected PV system in Central Greece, aiming to study these e?ects. The methodology of analysis follows three directions, namely, PR computations, use of mathematical model’s prediction as reference value, and normalized e?ciency calculation. These metrics are correlated with the levels of dust accumulation on PV panels’ surfaces and the ambient aerosol mass concentration. The results show that only heavily soiled surfaces have signi?cant impact on PV performance and, particularly, a decrease of 5.6%. On the other hand, light or medium soiling have negligible impact on PV performance. On the other hand, the impact of ambient aerosol concentration levels on PV e?ciency is more complex and requires further study. Aerosol scattering of di?erent wavelengths can possibly a?ect PV e?ciency, however, this fact may be related to the speci?c spectral response of PV cells.
关键词： aerosols,dust,grid-connected PV systems,performance analysis
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - A method for error compensation of modeled annual energy production estimates introduced by intra-hour irradiance variability at PV power plants with a high DC to AC ratio
摘要： Financial models of PV power plants that are created during the development phase of a project are typically based upon simulations performed at hourly timesteps. Historical irradiance data used in these simulations, such as a Typical Meteorological Year, are created from average irradiances over hour-long periods. We find that when actual weather conditions include significant intra-hour variability in irradiance, the annual energy production estimates based on modeling in hourly timesteps will not account for all inverter clipping which occurs during moments of high irradiance. This effect is particularly significant for systems with high a DC to AC nameplate ratio. At some PV plants already in operation, this phenomenon has been found to result in overestimated production estimates of nearly 5%. In this work, the average amount of this error is quantified for locations within the United States, and a methodology is proposed for compensating for it in post processing. This methodology applies a variable discount to each hour of the year for hourly energy output simulations based on irradiance. The discount function is intended to account for the difference in useful insolation as computed from hourly average irradiance data versus sub-hourly sampling rates.
关键词： photovoltaic systems,power system modeling,performance analysis,solar energy,solar power generation,power system simulation
更新于2025-09-19 17:13:59
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Performance analysis of solar photovoltaic panel at Karaikal weather conditions
摘要： Increase in need of non-renewable energy sources has directed to the installation of Photovoltaic (PV) plants in many areas. Performance analysis of these PV plants could support in designing, operating and maintenance of PV systems. A PV panel was installed at the terrace of Science Block of NIT-Puducherry, Karaikal, India located at 10° latitude. The performance of this installed PV panel was analyzed by during August 2017 to February 2018. In this study, the average power output and system efficiency are analyzed. The results show that PV performance depends on geographical location and climatic conditions such as solar radiation and ambient temperature.
关键词： Performance Analysis,Climatic Conditions,Solar,Photovoltaics
更新于2025-09-19 17:13:59
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[IEEE 2019 International Conference on Optical MEMS and Nanophotonics (OMN) - Daejeon, Korea (South) (2019.7.28-2019.8.1)] 2019 International Conference on Optical MEMS and Nanophotonics (OMN) - Plasmonic Tip Internally Excited via Cylindrical Vector Beam for Surface Enhanced Raman Spectroscopy
摘要： In this paper, the problem of joint multi-pitch and direction-of-arrival (DOA) estimation for multichannel harmonic sinusoidal signals is considered. A spatio-temporal matrix signal model for a uniform linear array is defined, and then the ESPRIT method based on subspace techniques that exploits the invariance property in the time domain is first used to estimate the multi pitch frequencies of multiple harmonic signals. Followed by the estimated pitch frequencies, the DOA estimations based on the ESPRIT method are also presented by using the shift invariance structure in the spatial domain. Compared to the existing state-of-the-art algorithms, the proposed method based on ESPRIT without 2-D searching is computationally more efficient but performs similarly. An asymptotic performance analysis of the DOA and pitch estimation of the proposed method are also presented. Finally, the effectiveness of the proposed method is illustrated on a synthetic signal as well as real-life recorded data.
关键词： ESPRIT,DOA estimation,performance analysis,pitch estimation
更新于2025-09-19 17:13:59
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Performance and Empirical Analysis of Photovoltaic Modules Made of Different Technologies Using Capacity Evaluation Method
摘要： Performance of 5 photovoltaic (PV) modules made of different technologies (monocrystalline silicon, polycrystalline silicon, amorphous silicon, copper indium selenide and heterojunction with intrinsic layer) is evaluated according to the short-term capacity evaluation method described in IEC TS 61724-2 standard. Measurements for the analysis are obtained from the data acquisition system developed by the Laboratory for Renewable Energy Sources at the Faculty of Electrical Engineering, Computer Science and Information Technology (FERIT) Osijek which is described in the paper. Results of the performance analysis according to the IEC TS 61724-2 standard indicate that the copper indium selenide PV module Solar Frontier SF150-S has the greatest performance, therefore it is the most suitable PV module for the micro-location of Osijek, Croatia with European humid continental climate. The lowest performance of all studied PV modules is achieved by polycrystalline silicon PV module Bisol BMU 250. Empirical analysis of the relations of various electrical and meteorological parameters is performed and dependencies are evaluated. In the last section, mathematical models of PV module efficiency in relation to the module temperature are derived based on empirical analysis of measurements.
关键词： photovoltaic module,capacity evaluation method,performance analysis,empirical analysis
更新于2025-09-16 10:30:52
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Experimental characterization of the performance of different photovoltaic technologies on water bodies
摘要： Long term performance analysis of different PV technologies under the climatic condition of water bodies helps in the selection of appropriate PV technology for the large scale deployment on water bodies. The objective of the present research is to evaluate the suitability of different PV technologies on water bodies using performance and degradation analysis. Therefore, an experimental setup was designed to analyze the performance and degradation of HIT, Poly‐Si and CdTe PV technologies on the water surface and to compare their performance and degradation with the respective PV technologies deployed on the land surface. The data from experimental setup was measured for over one year duration. Furthermore, the evaporation reduction in PV panels covered water bodies has been experimentally measured. The performance of HIT and Poly‐Si PV panels on the water surface are found to be 0.4% and 2.7% lower than the corresponding land based panels, respectively; whereas the performance of CdTe panel on the water surface is found to be 3.1% higher than corresponding land based panel. The Poly‐Si panel has a degradation of 1.32% on the water surface which is significantly higher than the degradation rate of 0.93% of the corresponding land‐based panel whereas the HIT panels have almost similar degradation of approximately 0.50% in both climatic conditions. Thus, the study concludes that the HIT and CdTe technologies are suitable for water bodies applications. The experimental results show that the PV panel cover on the water bodies has reduced the evaporation loss by about 29% in one year.
关键词： PV technologies,performance analysis,degradation,water bodies based PV systems
更新于2025-09-12 10:27:22
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Performance Analysis of a Grid-Connected Rooftop Solar Photovoltaic System
摘要： Turkey is among the countries largely dependent on energy import. This dependency has increased interest in new and alternative energy sources. Installation of rooftop solar photovoltaic systems (RSPSs) in Turkey is increasing continuously regarding geographical and meteorological conditions. This paper presents an insight into the potential situation for Turkey and a simulation study for the RSPS designing and calculation for the faculty building at Marmara University in Istanbul. This simulation study demonstrates that 84.75-kWp grid-connected RSPS can produce remarkable power. The system is performed in detail with the PV*SOL software (Premium 2017 R8-Test Version, Valentin Software GmbH, Berlin, Germany). Detailed financial and performance analysis of the grid-connected RSPS for faculty building with various parameters is also carried out in this study. According to the simulation results, the system supplies 13.2% of the faculty buildings’ annual electrical energy consumption. The annual savings value of faculty buildings’ electrical consumption is approximately 90,298 kWh energy which costs roughly $7296. A photovoltaic (PV) system installation for the faculty building, which has considerable potential for solar energy and sunshine duration, is indispensable for clean energy requirements and was supported by the simulation results. This paper can be considered to be a basic feasibility study prior to moving on to the implementation project.
关键词： faculty building,performance analysis,rooftop solar photovoltaic
更新于2025-09-11 14:15:04