- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Outlier Events of Solar Forecasts for Regional Power Grid in Japan Using JMA Mesoscale Model
摘要： To realize the safety control of electric power systems under high penetration of photovoltaic power systems, accurate global horizontal irradiance (GHI) forecasts using numerical weather prediction models (NWP) are becoming increasingly important. The objective of this study is to understand meteorological characteristics pertaining to large errors (i.e., outlier events) of GHI day-ahead forecasts obtained from the Japan Meteorological Agency, for nine electric power areas during four years from 2014 to 2017. Under outlier events in GHI day-ahead forecasts, several sea-level pressure (SLP) patterns were found in 80 events during the four years; (a) a western edge of anticyclone over the Pacific Ocean (frequency per 80 outlier events; 48.8%), (b) stationary fronts (20.0%), (c) a synoptic-scale cyclone (18.8%), and (d) typhoons (tropical cyclones) (8.8%) around the Japanese islands. In this study, the four case studies of the worst outlier events were performed. A remarkable SLP pattern was the case of the western edge of anticyclone over the Pacific Ocean around Japan. The comparison between regionally integrated GHI day-ahead forecast errors and cloudiness forecasts suggests that the issue of accuracy of cloud forecasts in high- and mid-levels troposphere in NWPs will remain in the future.
关键词： outlier events,regional integration,global horizontal irradiance (GHI),photovoltaic (PV) power generation,numerical weather prediction (NWP),day-ahead forecast
更新于2025-09-23 15:23:52
-
Analysis of Nonlinear Dynamics of a Quadratic Boost Converter Used for Maximum Power Point Tracking in a Grid-Interlinked PV System
摘要： In this paper, the nonlinear dynamics of a PV-fed high-voltage-gain single-switch quadratic boost converter loaded by a grid-interlinked DC-AC inverter is explored in its parameter space. The control of the input port of the converter is designed using a resistive control approach ensuring stability at the slow time-scale. However, time-domain simulations, performed on a full-order circuit-level switched model implemented in PSIM c software, show that at relatively high irradiance levels, the system may exhibit undesired subharmonic instabilities at the fast time-scale. A model of the system is derived, and a closed-form expression is used for locating the subharmonic instability boundary in terms of parameters of different nature. The theoretical results are in remarkable agreement with the numerical simulations and experimental measurements using a laboratory prototype. The modeling method proposed and the results obtained can help in guiding the design of power conditioning converters for solar PV systems, as well as other similar structures for energy conversion systems.
关键词： subharmonic oscillations,DC-DC converters,maximum power point tracking (MPPT),nonlinear dynamics,photovoltaic (PV),quadratic boost
更新于2025-09-23 15:23:52
-
IoT Based Framework: Mathematical Modelling and Analysis of Dust Impact on Solar Panels
摘要： The solar photovoltaic performance is governed by manifold parameters viz. temperature, irradiance, dust on solar module, photoactive material, panel orientation. Among these dust is a critical impediment, as its accumulation on panel surface degrades its productivity; while frequent cleaning sessions affect module's life and result into PV destruction. Accordingly, the need to know dust thickness responsible for deteriorating panel's capability and adequate cleaning time of solar panels to produce optimum yields is requisite. This paper aims to discern a right cleaning time, owing to a particular dust thickness so as to conserve the panel efficiency using internet of things (IoT). The mathematical correlations of PV efficiency and current with thickness of accumulated dust are derived using linear regression. Further, these equations are associated with an IoT-based platform which remotely monitors and records PV output current; thereafter dust thickness corresponding to a significant current reduction is estimated. For this, experimental data of 46 inverters with total 114,819.30 kWh productions in a month with an average of 4416.13 kWh/day is accessed and the results pertaining to mathematical analysis exhibit a decline in current by 1 A with 5.51 × 10^{-3} mm thickness of dust.
关键词： Transmittance,Photovoltaic module,Output efficiency,Dust deposition
更新于2025-09-23 15:23:52
-
[IEEE 2018 IEEE XXVII International Scientific Conference Electronics (ET) - Sozopol, Bulgaria (2018.9.13-2018.9.15)] 2018 IEEE XXVII International Scientific Conference Electronics - ET - Algorithm for Single Axis Solar Tracker
摘要： The Sun gives us PW’s free of charge renewable energy, which can be converted into electricity by photovoltaic panels or into heat by sun collectors. Algorithm and hardware block diagram of single axis solar tracker are made in this paper. Also a comparison is made between a single axis solar tracking photo voltaic system and a fixed one. One axis solar tracking system gets average up to 30% more solar energy in comparison with the static one.
关键词： Solar Energy,Microcontroller,Photovoltaic,Green Energy,Solar Tracker
更新于2025-09-23 15:23:52
-
Enhanced Active Power balancing capability of Grid connected Solar PV fed Cascaded H-bridge Converter
摘要： Cascaded H-bridge converter is a promising solution for next generation large scale PV system having both active and reactive power exchange capacity. However, one challenge with this converter is unbalanced power generation among the clusters or cells due to variation in radiation level, temperature, dusting on PV cells etc. In order to inject balanced power to the grid, in this paper, a controlled exchange of reactive power is proposed so that the converter can work with unbalanced power generation within the clusters. Magnitude of reactive power exchange is derived and necessary conditions discussed. Additionally, the magnitude of zero voltage is derived taking into account both active and reactive power exchange with the grid. By exchanging reactive power, the converter can also be used during low voltage ride through (LVRT) condition. This paper introduces a novel representation of unbalanced power generation using barycentric coordinate system which helps to identify regions in the power plane which require the exchange of reactive power. The proposed method is verified through computer simulation and in a laboratory prototype.
关键词： Maximum Power point tracking (MPPT),Active power,Zero sequence voltage,Reactive power,Solar Photovoltaic,Cascaded H-bridge multilevel converter(CHB)
更新于2025-09-23 15:23:52
-
[SpringerBriefs in Energy] Grid Parity and Carbon Footprint (An Analysis for Residential Solar Energy in the Mediterranean Area) ||
摘要： In the context of global warming, big cities’ atmosphere is always more contaminated and natural disasters in augmentation, solar energy, and more generally renewable energies are sources of great enthusiasm. Besides, thanks to recent improvements in technologies, the costs of photovoltaic (PV) have strongly declined in the last decades and are now accessible for particulars. The purpose of this project is then to study the economic profitability of solar energy for a residential use. A common and appropriate tool for this is the grid parity. This term, largely used in the literature, refers to the moment when producing electricity from solar modules will have the same cost than buying it from the grid. Grid parity depends mainly on the geographic position (as solar irradiation is very different from a place to another) and on the local electricity price. Consequently, a country with expensive electricity and a high rate of irradiation is more likely to reach grid parity soon. In the present study, the geographic framework chosen is the Mediterranean area, which includes countries with similar climates but with other differences sufficiently important to obtain interesting comparative results. The PV system used in the following model is a basic one since it does not include energy storage or resale to the grid, which gives a conservative perspective to the study. Extensive financial analysis is conducted in order to determine under which conditions it is the most profitable. The secondary objective is to evaluate the environmental impact of solar energy, mainly by carrying out carbon footprint analysis. It basically consists in comparing the emissions released by the manufacturing process of the modules to the reduction obtained thanks to its utilization. This study is first realized at an individual level and, then, is generalized at a national one in order to measure what could be the contribution of a massive investment in residential solar energy to the Paris agreement objectives.
关键词： Mediterranean area,Carbon footprint,Residential solar energy,Economic profitability,Environmental impact,Photovoltaic energy,Grid parity
更新于2025-09-23 15:23:52
-
[IEEE 2018 2nd IEEE Conference on Energy Internet and Energy System Integration (EI2) - Beijing, China (2018.10.20-2018.10.22)] 2018 2nd IEEE Conference on Energy Internet and Energy System Integration (EI2) - A Power Prediction System for Photo-Voltaic Power Plants
摘要： In this paper, a frequency domain identification-based power prediction system is developed for the photo-voltaic (PV) power plant. A first-order plus dead time (FOPDT) model of the PV power plant is first identified using the daily PV power plant operating data. Given the identified FOPDT model, we do discretization to obtain an FOPDT-based iterative calculation formula for the PV power prediction. Finally, a portable Power Prediction software of Python is developed using the resulting iterative calculation formula. In numerical experiments, we showcase the effectiveness of the Power Prediction software by applying it to real data.
关键词： Solar Irradiance,Python,Photovoltaic Power plant,Portable,Frequency Identification,Power Prediction
更新于2025-09-23 15:23:52
-
[IEEE 2018 IEEE Industry Applications Society Annual Meeting (IAS) - Portland, OR, USA (2018.9.23-2018.9.27)] 2018 IEEE Industry Applications Society Annual Meeting (IAS) - Design and Optimization of a Solar Power Conversion System for Space Applications
摘要： This manuscript details a design method for a 500kW solar power based microgrid system for space applications. The design method utilizes multi-objective optimization with the Genetic Algorithm considering four parameters that characterize solar power based microgrids (battery voltage, PV maximum power, PV maximum power point voltage, and number of panels per string). The final optimization metric is the ratio of daily average deliverable power to total system mass (W/kg) metric. The microgrid system is composed of a number of modular DC-DC micro-converters, of which four topologies (buck, boost, buck-boost and non-inverting buck-boost) are evaluated and compared. The non-inverting buck-boost converter is determined to be the best candidate, and the optimal system characteristics are provided and analyzed. The final system design achieves a specific power of 35.56W/kg, with optimized result of 743.7V battery voltage, 439.5W PV maximum power, 182.7V PV maximum voltage, and three panels per string. Based on the optimizations results, a prototype is designed, tested, and analyzed in terms of efficiency and low temperature reliability. The converter achieved a peak efficiency of 98.4%, a power density of 3.54W/cm3, a specific power of 3.76W/g, and operated for over 267 hours of 11-minute low temperature cycles from 0oC to -140oC.
关键词： wide band gap semiconductors,microgrids,non-inverting buck-boost,maximum power point trackers,space exploration,photovoltaic systems,design optimization,DC-DC power converters,system-level design,low temperature testing
更新于2025-09-23 15:23:52
-
[IEEE 2018 4th International Conference on Renewable Energies for Developing Countries (REDEC) - Beirut, Lebanon (2018.11.1-2018.11.2)] 2018 4th International Conference on Renewable Energies for Developing Countries (REDEC) - The first BIPV plant in Lebanon: performance analysis of hybrid configuration with diesel generator
摘要： Building integrated photovoltaic (BIPV) system is a technology where radiant energy and heat are treated. This system helps in developing the building to become energy producer instead of energy consumer. It can function as buildings envelop and supply electric power for buildings. In this paper, a pilot BIPV system is studied with respect to aesthetical and technical requirements, and installed on the fa?ade of an office building in Beirut. The aim of the research is to test the energy performance of the BIPV system through modelling and experimental investigation in hybrid configuration with building back-up diesel generators – a Lebanese particularity due to utility shortage in power supply. This first BIPV project in Lebanon has a capacity of 30 kWp. It has a special architectural integration benefiting from available solar energy estimated to be around 2000 kWh/m2/ year to produce electric power, and reduces the consumption of diesel generators that runs the building during working hours.
关键词： renewable energy,case study,photovoltaic system,building integration,BIPV,solar energy
更新于2025-09-23 15:22:29
-
[IEEE 2018 IEEE International Students' Conference on Electrical, Electronics and Computer Science (SCEECS) - Bhopal (2018.2.24-2018.2.25)] 2018 IEEE International Students' Conference on Electrical, Electronics and Computer Science (SCEECS) - Solar Power Based Three-Level Neutral Clamped Inverter Fed DTFC-SVM of an IM Drive
摘要： This paper presents a solar power based three-level neutral clamped inverter (3LNCI) fed induction motor drive (IMD) with space vector modulation based direct torque and flux control (DTFC-SVM) for the water pumping applications. Due to the robustness and the flexible operating characteristics, induction motor is most suitable for water pump system. A DC/DC boost converter along with perturb and observe method of maximum power point tracking (MPPT) control technique is employed to draw sophisticated power from the solar photovoltaic (PV) array. The DTFC-SVM of an IMD using 3LNCI is proposed for improving performance and reducing the ripple contents of torque, flux and stator currents. The proposed method is simulated in MATLAB/SIMULINK environment and simulated results are presented under various operating conditions.
关键词： photovoltaic array,space vector modulation,induction motor drive,three-level diode clamped inverter,Direct torque and flux control
更新于2025-09-23 15:22:29