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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) - System Level Assessment of the Impact of High Penetration of PV Inverters with Grid Support Capability on Distribution Networks
摘要： Power systems simulations using PSCAD have been performed to evaluate the impact to the distribution grid of high photovoltaic (PV) penetration. Voltage regulation at load nodes, feeder short-circuit currents and power losses have been analyzed for penetration level up to 60% and compared with a baseline case referring to as no PV. Results show that high PV penetration impacts residential area and non-residential area networks differently. Also, depending on the grid strength, the performance of the network is different. PV micro-inverters, in some cases, can prevent voltage excursion beyond tolerance limits however, they are more effective for power losses reduction. Overall, up to 15% in energy losses can be saved at very high penetration levels. Regarding the short-circuit levels no adjustment in the network infrastructures is required as the PV systems will have inconsequential contribution in feeder short-circuit currents.
关键词： power distribution,Power conversion,Photovoltaic power systems
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Gramado, Brazil (2019.9.15-2019.9.18)] 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Power Flow Analysis on Networks with High Integration of Distributed Photovoltaic Generation
摘要： This article proposes the use of a controlled current source as a photovoltaic generator, due the fact that recent work shows that this choice provides faster processing speed and agile implementation to obtain the power ?ow. This phasorial analysis will be tested using, with some considerations, the 13-Node Test Feeder topology and its input data. Initially, no distributed generation will be considered connected to the feeder and, for a second analysis, photovoltaic distributed generation will be inserted in the system to perform the power ?ow calculation with the proposed model. The reference simulator will be the Knowledge’s Virtual Academy (KVA), because it is a free-access software with a high-level solver to perform the numerical calculation. While the proposed methodology will be implemented in the sotfware Matlab. This study compares and analyze the voltage magnitude, mainly, and angle values obtained for both methods, the KVA result and the proposed method, for the scenarios with and without distributed generation.
关键词： Photovoltaic systems,Electric power systems,Computational system,Power ?ow
更新于2025-09-23 15:21:01
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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) - Data-integrity Checks and Balances in Monitoring of a Solar PV System
摘要： This paper proposes to perform certain integrity checks and balances to omit the wrong data in the monitoring of a solar PV plant. Further, these checks and balances are segregated into three types: basic, specific, and pattern checks. The former is performed on the data collected from all the types of sensors. However, the second check is performed on the data collected from the specific instruments. These checks are specific to the site, instrument, parameter, etc. The third check verifies the shape of profiles between the data of different sections of the PV system. For the data-inclusion/deletion purpose, the parameters of PV plant are segregated into a triangle-hierarchy of highest-least priority. Some of the proposed checks are performed on the raw data collected from a grid-tied 271 kW PV plant and 6.4 kW test PV plant. The results have indeed identified some of the bad data and validated the proposed checks.
关键词： photovoltaic (PV),PV plant health monitoring,data quality,data integrity,PV plant data,maximum power point tracking (MPPT)
更新于2025-09-23 15:21:01
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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) - The Influence of Al <sub/>2</sub> O <sub/>3</sub> Passivation of III-V on Ge Multijunction Solar Cells to the Spatial Distribution of Luminescent Coupling Effect
摘要： The nonuniformity of luminescent coupling (LC) effect in III-V based multijunction solar cells (MJSCs) is partly ascribed to recombination at perimeter defects. An attempt to solve this was done by sidewall passivation of InGaP/GaAs/Ge triple junction solar cells through atomic layer deposition of thin Al2O3. Results revealed that sidewall passivation of a complete MJSC can increase LC current collection in a limiting GaAs middle cell by 21.9% and enhance its uniformity by 7.2%; hence, demonstrating a non-invasive way to improve current matching among subcells.
关键词： photovoltaic cells,luminescence coupling,current mapping,atomic layer deposition,laser beam-induced passivation
更新于2025-09-23 15:21:01
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Photovoltaic parameters and stability study of HTM-free mixed-cation perovskite solar cells by incorporating additives to absorbing layers
摘要： In this study, quick route-coating is practiced to substitute methyl ammonium (MA) cation with formamidinium (FA) at different ratios. Through optimizing the MA:FA ratio, a maximum power conversion efficiency (PCE) of 8.31% is achieved for holes transporting material-free MA0.8FA0.2PbI3 mixed PSCs with the JSC of 19.02 mA/cm2, VOC of 0.859 V and FF of 50.88%. Then, to improve the performance, stability and carrier transport dynamic, various additives (PVA, PVP, PEG and EC) are incorporated into the perovskite layer. The treatment of perovskites with additives has proved to cause significant changes in the surface roughness, charge accumulation, charge transport, charge transport resistance, photovoltaic performance and cell stability. PCE of the PSCs mixed with PVA, PVP, EC and PEG optimally reaches 12.76%, 11.28%, 10.38% and 8.92%, respectively. Among the additives, EC and PVP provide better stability owing to the excellent interaction between the functional group of the additives and the perovskite. Surface modification and charge transport also occur better with those two additives.
关键词： Charge transport,Perovskite solar cells,Stability,Additives,Photovoltaic performance
更新于2025-09-23 15:21:01
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Photovoltaic effect generated by spin-orbit interactions
摘要： An AC electric ?eld applied to a junction comprising two spin-orbit coupled weak links connecting a quantum dot to two electronic terminals is proposed to induce a DC current and to generate a voltage drop over the junction if it is a part of an open circuit. This photovoltaic effect requires a junction in which mirror re?ection symmetry is broken. Its origin lies in the different ways inelastic processes modify the re?ection of electrons from the junction back into the two terminals, which leads to uncompensated DC transport. The effect can be detected by measuring the voltage drop that is built up due to that DC current. This voltage is an even function of the frequency of the AC electric ?eld.
关键词： quantum dot,photovoltaic effect,spin-orbit interactions,DC current,voltage drop
更新于2025-09-23 15:21:01
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Enhancement in Photovoltaic Properties of <i>N</i> , <i>N</i> a??diethylaniline based Donor Materials by Bridging Core Modifications for Efficient Solar Cells
摘要： The increasing demand of energy expedited the development of efficient photovoltaic materials.Herein, five push-pull donor materials (D1-D5) having N,N-diethylaniline as donor moiety and rhodanine-3-acetic as acceptor group are designed to be used as donor molecules in organic solar cells (OSCs). The bridging core modification of recently synthesized MR3 molecule (reference R) has been made with different π-spacers namely thiazole (B1), thieno[3,2-b]thiophene (B2), thiazolo[5,4-d] thiazole (B3), 2-(thiophen-2-yl)thiophene (B4) and 5-(thiazol-5yl)thiazole (B5). The structure–property relationship is studied and influence of bridging core modifications on photovoltaic, photophysical and electronic properties of D1-D5 are calculated and compared with reference R.The DFT and TDDFT calculations have been performed for the estimation of frontier molecular orbital (FMO) analysis, density of states (DOS) graphs, reorganization energies of electron and hole, open circuit voltage, photophysical characteristics, transition density matrix (TDM) surfaces and charge transfer analysis.Designed molecules exhibit better and comparable optoelectronic properties than synthesized reference molecules. Among all investigated molecules, D5 is proven as best candidate for OSCs application due to its promising photovoltaic properties including lowest band gap (2.24 eV), small electron mobility (λe = 0.0056 eV), small hole mobility (λh = 0.0046 eV), low binding energy (Eb = 0.21 eV), highest λmax values 610.76 nm (in gas) 670.22 nm (in acetonitrile) and high open circuit voltage (Voc = 1.17 V) with respect to HOMOdonor–LUMOPC61BM. This theoretical framework demonstrates that bridging core modification is a simple and effective alternative strategy to achieve the desirable optoelectronic properties. Furthermore, conceptualized molecules are superior and thus are recommended to experimentalist for out-looking future developments of highly efficient solar cells.
关键词： Rhodanine-3-acetic acid,Solar cells,Photovoltaic properties,Bridging core modifications,Density functional theory (DFT),N,N-diethylaniline
更新于2025-09-23 15:21:01
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[IEEE 2019 22nd International Conference on Electrical Machines and Systems (ICEMS) - Harbin, China (2019.8.11-2019.8.14)] 2019 22nd International Conference on Electrical Machines and Systems (ICEMS) - Seamless Transfer Scheme Based on Unified Control Structure for Single-Stage Photovoltaic Inverter
摘要： The seamless transfer between islanded and grid-connected modes can be achieved by the voltage-type control inverter based on traditional droop control scheme. However, the grid current cannot be controlled directly when the inverter is connected to the grid, which shows that the grid current is easily distorted by the grid voltage harmonics. Moreover, the dynamics of the grid current may be slow under the traditional droop control. To resolve these issues, a novel seamless transfer scheme between two operation modes with unified control structure is proposed in this paper. Simulation results and experimental results are both presented, showing the feasibility of the proposed scheme.
关键词： Droop control,Seamless transfer,Photovoltaic inverter
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE Sustainable Power and Energy Conference (iSPEC) - Beijing, China (2019.11.21-2019.11.23)] 2019 IEEE Sustainable Power and Energy Conference (iSPEC) - Analysis of the Impact of MW-level Grid-connected Photovoltaic Power Station on Backup Automatic Switch in Distribution Network
摘要： With the continuous improvement of grid-connected photovoltaic power station capacity, the influence on the reliable operation of backup automatic switch equipment in the distribution network is also increasing. The impact of PV on the backup automatic switch is mainly due to the fact that after the bus line is de-energized, the PV will continue to supply power to the busbar, which will affect the judgment of the busbar without pressure. In this paper, according to the setting value of backup automatic switch protection commonly used in distribution network, under different load-to-source capacity ratio, the influence of PV on the reliability of the backup automatic switch action and the change of the bus voltage of the PV-connected busbar after the main supply line is de-energized are quantitatively analyzed. Through simulation verification, it is proposed that the most fundamental method to avoid the influence of PV on backup automatic switch is to disconnect the PV power station after failure or loss of system power supply, so as to prevent the occurrence of isolated islands.
关键词： MW-level photovoltaic power station,load-to-source capacity ratio,loss of busbar voltage,the backup automatic switch
更新于2025-09-23 15:21:01
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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) - Toward >25% Efficient Monolithic Epitaxial GaAsP/Si Tandem Solar Cells
摘要： We report here on progress made in the development of >20% efficient monolithic epitaxial III-V/Si tandem solar cells. Following our prior demonstration of a GaAs0.75P0.25/Si tandem cell with verified AM1.5G efficiency of 20.1%, we have undertaken intensive efforts aimed at optimization of the top and bottom subcells, involving both materials quality improvement and detailed device structure refinement. To date we have thus demonstrated 21.8% AM1.5G GaAs0.75P0.25/Si tandem cells making use of an optimized, but still defect-limited GaAsP top cell combined with a simple diffusion-processed (emitter and back-surface field) Si bottom cell. With recent development of a low dislocation density III-V-on-Si epitaxial materials platform, as well as bottom cell enhancements for photon management, analytical performance loss analysis and efficiency projections indicate that >25% is achievable in the near-term, and 30% within reach with additional holistic optimization.
关键词： photovoltaic cells,Si,III-V semiconductor materials,semiconductor epitaxial layers
更新于2025-09-23 15:21:01