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Split-based sequential sampling for realtime security assessment

Bugaje, A.-.A.B. (author), Cremer, Jochen (author), Strbac, Goran (author)

Machine learning (ML) for real-time security assessment requires a diverse training database to be accurate for scenarios beyond historical records. Generating diverse operating conditions is highly relevant for the uncertain future of emerging power systems that are completely different to historical power systems. In response, for the first...

journal article 2023

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Individual yield nowcasting for residential PV systems

Grzebyk, Daniel (author), Alcañiz Moya, A. (author), Donker, Jaap (author), Zeman, M. (author), Ziar, H. (author), Isabella, O. (author)

Due to the inherent uncertainty in photovoltaic (PV) energy generation, an accurate power forecasting is essential to ensure a reliable operation of PV systems and a safe electric grid. Machine learning (ML) techniques have gained popularity on the development of this task due to its increased accuracy. Most literature, however, focuses only...

journal article 2023

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Energy Loss Analysis of Two-Terminal Tandem PV Systems under Realistic Operating Conditions—Revealing the Importance of Fill Factor Gains

Blom, Y. (author), Vogt, M.R. (author), Ruiz Tobon, C.M. (author), Santbergen, R. (author), Zeman, M. (author), Isabella, O. (author)

The tandem PV technology can potentially increase the efficiency of PV modules over 30%. To design efficient modules, a quantification of the different losses is important. Herein, a model for quantifying the energy loss mechanisms in PV systems under real-world operating conditions with a level of detail back to the components and their...

journal article 2023

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Exploring Stability and Accuracy Limits of Distributed Real-Time Power System Simulations via System-of-Systems Cosimulation

Barbierato, Luca (author), Pons, Enrico (author), Bompard, Ettore Francesco (author), Subramaniam Rajkumar, Vetrivel (author), Palensky, P. (author), Bottaccioli, Lorenzo (author), Patti, Edoardo (author)

Electromagnetic transients (EMT) is the most accurate, but computationally expensive method of analyzing power system phenomena. Thereby, interconnecting several real-time simulators can unlock scalability and system coverage, but leads to a number of new challenges, mainly in time synchronization, numerical stability, and accuracy...

journal article 2023

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Update Scheduling for ADMM-based Energy Sharing in Virtual Power Plants Considering Massive Prosumer Access

Feng, Cheng (author), Zheng, Kedi (author), Zhou, Yangze (author), Palensky, P. (author), Chen, Qixin (author)

With the proliferation of distributed energy resources (DERs), electricity consumers in virtual power plants (VPPs) are transitioning into prosumers and are encouraged to share surplus energy with peers. Nevertheless, large-scale energy sharing among thousands of prosumers may encounter communication-related challenges. Communication network...

journal article 2023

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Developing an energy rating for bifacial photovoltaic modules

Vogt, M.R. (author), Pilis, Giorgos (author), Zeman, M. (author), Santbergen, R. (author), Isabella, O. (author)

The photovoltaic (PV) module energy rating standard series IEC 61853 does not cover bifacial PV modules. However, the market share of bifacial PV modules has dramatically increased in recent years and is projected to grow. This work demonstrates how Parts 3 and 4 of the IEC 61853 standard could be extended to bifacial modules. First, we...

journal article 2023

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A GNN-Based Generative Model for Generating Synthetic Cyber-Physical Power System Topology

Liu, Y. (author), Xie, H. (author), Presekal, A. (author), Stefanov, Alexandru (author), Palensky, P. (author)

Synthetic networks aim at generating realistic projections of real-world networks while concealing the actual system information. This paper proposes a scalable and effective approach based on graph neural networks (GNN) to generate synthetic topologies of Cyber-Physical power Systems (CPS) with realistic network feature distribution. In order...

journal article 2023

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Screen Printed Fire-Through Contact Formation for Polysilicon-Passivated Contacts and Phosphorus-Diffused Contacts

Chaudhary, A. (author), Hos, Jan (author), Lossen, Jan (author), Huster, Frank (author), Kopecek, Radovan (author), van Swaaij, R.A.C.M.M. (author), Zeman, M. (author)

In this article, we investigate the passivation quality and electrical contact properties for samples with a 150 nm thick n+ polysilicon layer in comparison to samples with a phosphorus diffused layer. High level of passivation is achieved for the samples with n+ polysilicon layer and an interfacial oxide underneath it. The contact properties...

journal article 2022

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Mapping the photovoltaic potential of the roads including the effect of traffic

Ferri, Carlotta (author), Ziar, H. (author), Nguyen, T.T. (author), van Lint, J.W.C. (author), Zeman, M. (author), Isabella, O. (author)

After developing the methodology, we applied it to the case of the Netherlands highways. We show that the average irradiation on the Dutch highway network is around 880 kWh/m2/y, 35% less than the potential of an optimally tilted conventional PV system in the south of the Netherlands. Covering the entire 1600 km of the Dutch highways network...

journal article 2022

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Oxygen-alloyed poly-Si passivating contacts for high-thermal budget c-Si heterojunction solar cells

Yang, G. (author), Han, C. (author), Procel Moya, P.A. (author), Zhao, Y. (author), Singh, M. (author), Mazzarella, L. (author), Zeman, M. (author), Isabella, O. (author)

Crystalline silicon solar cells with passivating contacts based on doped poly-Si exhibit high optical parasitic losses. Aiming at minimizing these losses, we developed the oxygen-alloyed poly-Si (poly-SiOx) as suitable material for passivating contacts. From passivation point of view, poly-SiOx layers show excellent passivation quality and...

journal article 2022

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A Carrier-based Two-Phase-Clamped DPWM Strategy With Zero-Sequence Voltage Injection for Three-Phase Quasi-Two-Stage Buck-Type Rectifiers

Xu, J. (author), Soeiro, Thiago B. (author), Wu, Y. (author), Gao, Fei (author), Wang, Y. (author), Tang, Houjun (author), Bauer, P. (author)

A three-phase buck-type rectifier features a step-down ac-dc conversion function, which is considered as a prominent solution for electric vehicle chargers and telecommunication systems integrated to the grid above 380 V line to line. However, traditional solutions for those applications employ cascaded architectures with an ac-dc boost-type...

journal article 2022

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Time-varying, ray tracing irradiance simulation approach for photovoltaic systems in complex scenarios with decoupled geometry, optical properties and illumination conditions

Calcabrini, A. (author), Cardose, Ruben (author), Gribnau, David (author), Babal, Pavel (author), Manganiello, P. (author), Zeman, M. (author), Isabella, O. (author)

The accurate computation of the irradiance incident on the surface of photovoltaic modules is crucial for the simulation of the energy yield of a photovoltaic system. Depending on the geometrical complexity of the surroundings, different approaches are commonly employed to calculate the irradiance on the photovoltaic system. In this article,...

journal article 2022

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Study on the Effect of Irradiance Variability on the Efficiency of the Perturb-and-Observe Maximum Power Point Tracking Algorithm

Martinez Lopez, V.A. (author), Žindžiūtė, U. (author), Ziar, H. (author), Zeman, M. (author), Isabella, O. (author)

Irradiance variability is one of the main challenges for using photovoltaic energy. This variability affects the operation of maximum power point trackers (MPPT) causing energy losses. The logic of the Perturb-and-Observe MPPT algorithm is particularly sensitive to quick irradiance changes. We quantified the existing relation between irradiance...

journal article 2022

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Ray-optics study of gentle non-conformal texture morphologies for perovskite/silicon tandems

Santbergen, R. (author), Vogt, M.R. (author), Mishima, Ryota (author), Hino, Masashi (author), Uzu, Hisashi (author), Adachi, Daisuke (author), Yamamoto, Kenji (author), Zeman, M. (author), Isabella, O. (author)

We investigate gentle front side textures for perovskite/silicon tandem solar cells. These textures enhance the absorption of sunlight, yet are sufficiently gentle to allow deposition of an efficient perovskite top cell. We present a tandem solar cell with such gentle texture, fabricated by Kaneka corporation, with an efficiency as high as 28...

journal article 2022

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Towards bifacial silicon heterojunction solar cells with reduced TCO use

Han, C. (author), Santbergen, R. (author), van Duffelen, Max (author), Procel Moya, P.A. (author), Zhao, Y. (author), Yang, G. (author), Zhang, Xiaodan (author), Zeman, M. (author), Mazzarella, L. (author), Isabella, O. (author)

Reducing indium consumption, which is related to the transparent conductive oxide (TCO) use, is a key challenge for scaling up silicon heterojunction (SHJ) solar cell technology to terawatt level. In this work, we developed bifacial SHJ solar cells with reduced TCO thickness. We present three types of In₂O₃-based TCOs,...

journal article 2022

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Raman spectroscopy of silicon with nanostructured surface

Kadlečíková, Magdaléna (author), Vančo, Ľubomír (author), Breza, Juraj (author), Mikolášek, Miroslav (author), Hušeková, Kristína (author), Fröhlich, Karol (author), Procel Moya, P.A. (author), Zeman, M. (author), Isabella, O. (author)

We compared the morphology and Raman response of nanoscale shaped surfaces of Si substrates versus monocrystalline Si. Samples were structured by reactive ion etching, and four of them were covered by a RuO₂-IrO₂ layer. Raman bands, centred at approx. 520 cm^–1, belonging to samples processed by etching the Si...

journal article 2022

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Introducing a comprehensive physics-based modelling framework for tandem and other PV systems

Vogt, M.R. (author), Ruiz Tobon, C.M. (author), Alcañiz Moya, A. (author), Procel Moya, P.A. (author), Blom, Y. (author), Nour El Din, A. (author), Stark, T. (author), Wang, Z. (author), Goma, E. Garcia (author), Etxebarria, J. G. (author), Ziar, H. (author), Zeman, M. (author), Santbergen, R. (author), Isabella, O. (author)

We introduce a novel simulation tool capable of calculating the energy yield of a PV system based on its fundamental material properties and using self-consistent models. Thus, our simulation model can operate without measurements of a PV device. It combines wave and ray optics and a dedicated semiconductor simulation to model the...

journal article 2022

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Achieving 23.83% conversion efficiency in silicon heterojunction solar cell with ultra-thin MoO_x hole collector layer via tailoring (i)a-Si:H/MoO_x interface

Cao, L. (author), Procel Moya, P.A. (author), Alcañiz Moya, A. (author), Yan, J. (author), Tichelaar, F.D. (author), Özkol, E. (author), Zhao, Y. (author), Han, C. (author), Yang, G. (author), Yao, Z. (author), Zeman, M. (author), Santbergen, R. (author), Mazzarella, L. (author), Isabella, O. (author)

Thin films of transition metal oxides such as molybdenum oxide (MoO_x) are attractive for application in silicon heterojunction solar cells for their potential to yield large short-circuit current density. However, full control of electrical properties of thin MoO_x layers must be mastered to obtain an efficient hole...

journal article 2022

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Device operation of P-ion-implanted n-BaSi₂/p-Si heterojunction solar cells

Aonuki, S. (author), Yamashita, Yudai (author), Limodio, G. (author), Narita, Shunsuke (author), Takayanagi, Kaori (author), Iwai, Ai (author), Toko, Kaoru (author), Zeman, M. (author), Isabella, O. (author), Suemasu, Takashi (author)

We formed phosphorous(P)-ion-implanted n-BaSi₂ films on p-Si(111) substrates and demonstrated solar-cell functionality of the n-BaSi₂/p-Si heterojunction under AM1.5 illumination. The BaSi₂ films were grown by molecular beam epitaxy, followed by implantation of P ions to the BaSi₂ films using PF<sub...

journal article 2022

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Erratum to: Sub-gap defect density characterization of molybdenum oxide: An annealing study for solar cell applications (Nano Research, (2020), 13, 12, (3416-3424), 10.1007/s12274-020-3029-9)

Scire, D. (author), Procel Moya, P.A. (author), Gulino, Antonino (author), Isabella, O. (author), Zeman, M. (author), Crupi, Isodiana (author)

Ref. [56] was unfortunately wrong, Instead of [56] Corless, R. M.; Gonnet, G. H.; Hare, D. E. G.; Jeffrey, D. J.; Knuth, D. E. On the Lambert W function. Adv. Comput. Math. 1996, 5, 329–359. It should be changed to Biswas, R. K.; Khan, P.; Mukherjee, S.; Mukhopadhyay, A. K.; Ghosh, J.; Muraleedharan, K. Study of short range structure of...

journal article 2022