- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2018 IEEE ANDESCON - Santiago de Cali (2018.8.22-2018.8.24)] 2018 IEEE ANDESCON - Grid-Connected Photovoltaic System in an Educational Building. Overview and Preliminary Data Analysis
摘要： This article provides an overview regarding a real implementation of a grid-connected PV system on the building of Universidad Nacional de Rafaela, Argentina. The aim is to investigate and emphasize the importance of the whole experience carried out by an educational institution in the central region of Argentina. The first part of the study is focused on the current legislation, standards and programs related to renewable energy in general and grid-connected PV systems in particular. Afterwards, the design and sizing stage and the connection protocol are described in detail. In order to illustrate the solar potential in the region and the system performance, generation data accounting for the PV system are provided. Based on this information, preliminary conclusions are presented.
关键词： Photovoltaic systems,Distributed generation,Educational buildings
更新于2025-09-11 14:15:04
-
An Integrated Semi-Double Stage based Multilevel Inverter with Voltage Boosting Scheme for Photovoltaic Systems
摘要： This paper proposes a single-phase, seven-level, transformerless inverter, employing a semi-double stage based conversion technique, which is particularly suitable for PV applications. The proposed configuration achieves voltage boosting using a non-isolated interleaved buck-boost converter, which is fused with the inverter configuration through two switched capacitors (SC). The interleaved front-end boost stage is capable of achieving a voltage gain of three while resulting in reduced peak current stress on the switching devices. In this topology, a part of the load power is transferred directly from the PV source, while the other part is transferred through the SCs. The proposed topology and the associated PWM technique are capable of reducing the leakage current by isolating the terminals of the PV source during the freewheeling state. This paper also presents a thorough analysis of the stray capacitor voltage and the common-mode voltage (CMV). These analyses reveal that the high-switching frequency transitions are eliminated in both of these waveforms. Furthermore, the proposed topology results in the reduction of the low-frequency transitions in the stray capacitor voltage and the CMV, which results in further reduction of the leakage current. The simulation and experimental results are in agreement with the mathematical analysis of the proposed inverter.
关键词： Leakage current minimization,Pulse width modulation inverters,Multilevel-inverter,Voltage boosting,Semi-double stage system,Photovoltaic systems
更新于2025-09-11 14:15:04
-
[IEEE 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - A CMOS-Based Energy Harvesting Approach for Laterally-Arrayed Multi-Bandgap Concentrated Photovoltaic Systems
摘要： This paper presents an energy harvesting approach for a concentrated photovoltaics (CPV) system based on cell-block-level integrated CMOS converters. The CPV system, built upon the Laterally-Arrayed Multi-Bandgap (LAMB) cell structure, is a potentially higher-efficiency and lower-cost alternative to traditional tandem-based systems. The cells within a sub-module block are connected for approximate voltage matching, and a CMOS-based multi-input single-output converter harvests and combines the energy while performing maximum power point tracking (MPPT) locally. First, a comparison of modeled performances achievable with traditional tandem CPV and LAMB CPV with a MISO converter is presented using day-long outdoor measured solar spectrum. The model predicts on average >19% more energy can be extracted from LAMB modules on a typical day. Then, a prototype miniaturized MISO dc-dc converter operating at 10MHz is developed in a 130nm CMOS process. For 45-160mW power levels, the prototype converter achieves >92% nominal and >95% peak efficiency in a small form factor designed to fit within available space in a LAMB PV cell block. The results demonstrate the potential of the LAMB CPV architecture for enhanced solar energy capture.
关键词： energy harvesting,maximum power point tracking,concentrated photovoltaic systems,CMOS,MISO dc-dc converter,DC-DC power converters
更新于2025-09-11 14:15:04
-
[IEEE 2018 Fourth International Conference on Advances in Electrical, Electronics, Information, Communication and Bio-Informatics (AEEICB) - Chennai (2018.2.27-2018.2.28)] 2018 Fourth International Conference on Advances in Electrical, Electronics, Information, Communication and Bio-Informatics (AEEICB) - PV Modules Based Grid Connected System Using Matlab Simulation
摘要： The Photovoltaic (PV) system can supply electric energy to the load by direct conversion of solar energy through photovoltaic (PV) effect. The process in which solar energy is converted into electrical energy is known as photovoltaic effect. It is depend on the different circumstance by different equations of current and voltage based on mathematical modeling. It gives current and voltage of PV module by different no. of cells and variation in irradiation and temperature. The PV cell output voltage boosts-up by the boost converter and the AC grid by DC/AC converter (inverter) control the power. This module can be further connected to the utility grid connected system for commercial and industrial application. It is provides precise modeling of P-V characteristics of solar system.
关键词： Solar Cell,Power Inverter,Photovoltaic systems,photovoltaic system,Solar Array,Solar Energy,modeling
更新于2025-09-10 09:29:36
-
<b>Impact of modified perturb and observe control on MPPT of PV/battery fed three - port DC‐DC converter
摘要： This paper presents the modified perturb and observe (P&O) maximum power point tracking (MPPT) method for photovoltaic (PV) fed three-port DC‐DC converter in PV/battery hybrid system. The proposed MPPT technique reduces the drift problem which occurs in the conventional MPPT methods by including the data of change in current (ΔI) in addition to the data used in the conventional P&O algorithm. The drift phenomenon and its effects are clearly demonstrated in this paper. The ability of the proposed P&O method to address this issue is proved by comparing the conventional P&O algorithm in different modes of operation. The performance assessment includes peak overshoot, settling time, MPP ratio and stability. The experimental validation was implemented using DSPIC30F4011 microcontroller. From the analysis and results, it could be seen that the modified P&O showed better performance in terms of accuracy in tracking the maximum power, less tracking time, high MPP ratio and reduced drift in the changing weather conditions.
关键词： DC‐DC power converters,current-voltage characteristics,photovoltaic systems,drift,power demand,pulse width modulation
更新于2025-09-10 09:29:36
-
Combined Tracking of the Maximum Power and Maximum Efficiency Operating Points for Real-Time Maximization of the Energy Production of PV Systems
摘要： The power production of a PV system can be maximized by applying a global MPPT method for ensuring that the PV array operates at the global MPP where its power production is maximized and, simultaneously, by dynamically maximizing the efficiency of the power converter that interfaces the PV-generated energy to the energy storage devices or the electric grid. In this paper, a new control method has been presented for the real-time maximization of the power production of PV systems by modifying in real-time the duty cycle and switching frequency of the power converter PWM control signal. The proposed method has the advantage that it can be applied in PV systems operating under partial shading conditions. Also, knowledge of either the operational characteristics and configuration of the PV modules within the PV array, or the power converter operational characteristics, is not required for its application. The experimental results validated that, by using the proposed method, the power production of the PV system is increased significantly compared to the case that only the power production of the PV array is maximized by using a global MPPT technique without tracking the optimal value of the power converter efficiency.
关键词： Power Converter Efficiency,Optimization,Partial shading,Photovoltaic systems,Maximum Power Point Tracking
更新于2025-09-09 09:28:46
-
[IEEE 2018 IEEE 7th International Conference on Photonics (ICP) - Kuah (2018.4.9-2018.4.11)] 2018 IEEE 7th International Conference on Photonics (ICP) - Simulating the Annual Energy Yield of a Rotationally Asymmetrical Optical Concentrator
摘要： This paper simulates the annual energy yield of a concentrator called the rotationally asymmetrical dielectric totally internally reflective concentrator (RADTIRC). One specific design of the RADTIRC is assumed to be installed in Berlin/Brandenburg, Germany. Simulation and experimental work have been carried out to determine the optical concentration gain under direct and diffuse radiations. Based on the analysis, it was found that the yearly energy yield was increased by a factor of 2.29 when the RADTIRC-PV module was used when compared with the non-concentrating PV module.
关键词： annual output,Berlin,solar photovoltaic,rotationally asymmetrical dielectric totally internally reflecting concentrator,building integrated photovoltaic systems
更新于2025-09-04 15:30:14
-
Dew as a Detrimental Influencing Factor for Soiling of PV Modules
摘要： Soiling of photovoltaic (PV) modules can significantly reduce their energy yield by reflecting or absorbing the incident light and is of great importance for operation and maintenance of PV systems in dusty environments. In this paper, we examine the influence of dew—which is formed on PV modules during night and early morning hours—on soiling processes. Outdoor experiments were performed in desert conditions in Qatar using unheated and heated glass samples supplied with different heating powers, as well as outdoor microscopy studies. In addition, laboratory soiling experiments were performed using different dust types, controlled dust removal by centrifugal forces at different relative humidity levels, and defined dew cycles. Results from both the field tests and laboratory soiling experiments showed a significant impact of dew on particle adhesion, removal, and corresponding soiling rates, which was independent of the dust type. Microstructural investigations using electron microscopy were performed to determine the cause of increased particle adhesion. Heating of glass surfaces during the night can significantly reduce the processes of cementation, particle caking, and capillary aging and, thus, reduce soiling. This study indicates that the prevention of condensation can be a method to mitigate soiling.
关键词： Photovoltaic systems,surface contamination,solar panels,solar energy
更新于2025-09-04 15:30:14
-
Hybrid global maximum power point tracking algorithm under partial shading condition
摘要： This paper presents a hybrid global maximum power point tracking (MPPT) algorithm under partial shading conditions, which consists of five methods, including the global scanning method, the filtering method, the binary searching method, the three-point method, and the anti-restarting method. By making full use of the advantages of these methods, the proposed algorithm is able to improve tracking speed and efficiency, decrease oscillation, and avoid restarting. Among which, the global scanning method is used to find all the local intervals, the filtering method is used to reduce the search area, the binary searching method is used to reduce the search time, the three-point method is used to track the global maximum power point dynamically, and the anti-restarting method is used to prevent restarting the algorithm. To verify the proposed algorithm, experiments have been carried out in a standard environment, dynamic solar irradiation, and dynamic temperature, respectively. The performance of the proposed algorithm is verified by comparing it with a perturb and observe (P&O) based global scanning MPPT method and a modified P&O with checking MPPT method using computer simulations.
关键词： MPPT,global maximum power point tracking,photovoltaic systems,partial shading condition,hybrid algorithm,solar energy
更新于2025-09-04 15:30:14
-
Reduction of Forced Outages in Islanded Microgrids by Compensating Model Uncertainties in PV Rating and Battery Capacity
摘要： Energy management systems for islanded microgrids often rely on predictions of energy availability and usage. Such predictions can be used to plan actions, such as shedding non-essential loads, so that critical loads continue to be served. However, uncertainties in the prediction models may lead to incorrect decisions, and subsequently jeopardize reliable operation of the microgrid. For a photovoltaic (PV) and battery based microgrid, uncertainties in the PV rating and the battery capacity model parameters can lead to otherwise avoidable outages. In this paper, techniques have been developed to identify and compensate for such model uncertainties. The approach uses differences between the actual and predicted data sequences to determine compensation factors to improve prediction accuracy. The developed techniques account for operating condition changes automatically, and no additional sensors are needed for their implementation. The method has been evaluated using data from rooftop irradiance and temperature sensors and the corresponding forecasts. It has been shown that the proposed techniques can improve the accuracy of the predictions and hence lead to more effective energy management decisions. Together with a pre-emptive load shedding strategy, the total outage time of the microgrid can be shortened by as much as 11% for the chosen scenario.
关键词： Energy management,photovoltaic systems,prediction model uncertainties,microgrids
更新于2025-09-04 15:30:14