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Comprehensive Study on Transformer Fault Detection via Frequency Response Analysis

Kakolaki, Seyed Ebrahim Hosseini (author), Hakimian, Vahid (author), Sadeh, Javad (author), Rakhshani, E. (author)

The sudden outage of a transformer due to a fault can cause irreparable damage to the electricity industry. Hence, by conducting momentarily inspections of the transformer's condition, faults can be promptly detected, and the transformer can be disconnected from the power grid to prevent subsequent failures in this equipment. Detecting faults...

journal article 2023

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Hybrid Analytical Model for AC Copper Loss Computation of Hairpin Winding

Du, Yunlu (author), Huang, Yunkai (author), Guo, Baocheng (author), Peng, Fei (author), Yao, Y. (author), Dong, J. (author)

This article proposes a hybrid analytical model (HAM) for predicting ac copper losses in hairpin windings. The HAM combines the nonlinear semi-analytical model (SAM) and the 1-D ac copper loss computation model to solve the inaccurate boundary solutions of the 1-D ac copper loss computation model when magnetic saturation occurs in the stator...

journal article 2023

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Generating quality datasets for real-time security assessment: Balancing historically relevant and rare feasible operating conditions

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

This paper presents a novel, unified approach for generating high-quality datasets for training machine-learned models for real-time security assessment in power systems. Synthetic data generation methods that extrapolate beyond historical data can be inefficient in generating feasible and rare operating conditions (OCs). The proposed...

journal article 2023

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Cyber Attacks on Power Grids: Causes and Propagation of Cascading Failures

Subramaniam Rajkumar, Vetrivel (author), Stefanov, Alexandru (author), Presekal, A. (author), Palensky, P. (author), Rueda, José L. (author)

Cascading effects in the power grid involve an uncontrolled, successive failure of elements. The root cause of such failures is the combined occurrence of multiple, statistically rare events that may result in a blackout. With increasing digitalisation, power systems are vulnerable to emergent cyber threats. Furthermore, such threats are not...

journal article 2023

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Congestion management in electricity distribution networks: Smart tariffs, local markets and direct control

Hennig, R.J. (author), De Vries, Laurens (author), Tindemans, Simon H. (author)

Increasing peaks from high-power loads such as EVs and heat pumps lead to congestion of electric distribution grids. The inherent flexibility of these loads could be used to resolve congestion events. Possible options for this are smart network tariffs, market-based approaches, and direct control of flexible loads by the network operator. In...

journal article 2023

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Resilient, Auditable and Secure IoT-Enabled Smart Inverter Firmware Amendments With Blockchain

Akkaoui, R. (author), Stefanov, Alexandru (author), Palensky, P. (author), Epema, D.H.J. (author)

The solar industry in residential areas has been witnessing an astonishing growth worldwide. At the heart of this transformation, affecting the edge of the electricity grid, reside smart inverters (SIs). These IoT-enabled devices aim to introduce a certain degree of intelligence to conventional inverters by integrating various grid support...

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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Will SiOx-pinholes for SiOx/poly-Si passivating contact enhance the passivation quality?

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

Passivating contacts based on poly-Si have enabled record-high c-Si solar cell efficiencies due to their excellent surface passivation quality and carrier selectivity. The eventual existence of pinholes within the ultra-thin SiOx layer is one of the key factors for carrier collection, beside the tunneling mechanism. However, pinholes are usually...

journal article 2023

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Strategies for realizing high-efficiency silicon heterojunction solar cells

Zhao, Y. (author), Procel Moya, P.A. (author), Han, C. (author), Cao, L. (author), Yang, G. (author), Özkol, E. (author), Alcañiz, Alba (author), Kovačević, K. (author), Limodio, G. (author), Santbergen, R. (author), Smets, A.H.M. (author), Weeber, A.W. (author), Zeman, M. (author), Mazzarella, L. (author), Isabella, O. (author)

Silicon heterojunction (SHJ) solar cells have achieved a record efficiency of 26.81% in a front/back-contacted (FBC) configuration. Moreover, thanks to their advantageous high V_OC and good infrared response, SHJ solar cells can be further combined with wide bandgap perovskite cells forming tandem devices to enable efficiencies well...

journal article 2023

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Industrially viable diffused IBC solar cells using APCVD dopant glass layers

Kuruganti, V.V. (author), Wurmbrand, Daniel (author), Buck, Thomas (author), Seren, Sven (author), Zeman, M. (author), Isabella, O. (author), Geml, Fabian (author), Plagwitz, Heiko (author), Terheiden, Barbara (author), Mihailetchi, Valentin D. (author)

Even though interdigitated back contact (IBC) architecture produces the most efficient solar cells, it is difficult to make them cost-effective and industrially viable. Therefore, single-sided atmospheric pressure chemical vapor deposition (APCVD) is investigated for the fabrication of IBC solar cells because it reduces the overall thermal...

journal article 2023

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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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Charging Infrastructure and Grid Integration for Electromobility

Rivera, Sebastian (author), Goetz, Stefan M. (author), Kouro, Samir (author), Lehn, Peter W. (author), Pathmanathan, Mehanathan (author), Bauer, P. (author), Mastromauro, Rosa Anna (author)

Electric vehicle (EV) charging infrastructure will play a critical role in decarbonization during the next decades, energizing a large share of the transportation sector. This will further increase the enabling role of power electronics converters as an energy transition technology in the widespread adoption of clean energy sources and their...

journal article 2023

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Closed-loop simulation testing of a probabilistic DR framework for Day Ahead Market participation applied to Battery Energy Storage Systems

van der Heijden, T.J.T. (author), Palensky, P. (author), van de Giesen, N.C. (author), Abraham, E. (author)

In this manuscript, we test the operational performance decrease of a probabilistic framework for Demand Response (DR). We use Day Ahead Market (DAM) price scenarios generated by a Combined Quantile Regression Deep Neural Network (CQR-DNN) and a Non-parametric Bayesian Network (NPBN) to maximise profit of a Battery Energy Storage System (BESS)...

conference paper 2023

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Wide-Area Damping of Sub-Synchronous Oscillations Excited by Large Wind Power Plants

van Vledder, C.A. (author), Rueda, José L. (author), Stefanov, Alexandru (author), Palensky, P. (author), Anaya-Lara, Olimpo (author), Kruimer, B. (author), Gonzalez-Loderiro, Francisco (author)

Power electronic interfaced generation (PEIG) has become significantly dominant in the electrical power grid. This development is leading to a decrease in systemic inertia and damping against electrical oscillations. This causes the introduction of new and faster dynamic phenomena. One of these phenomena is sub-synchronous control interaction ...

conference paper 2023

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Voltage Stability improvement based on firing angle control of SVCs in wind integrated system with ANN

Mishra, Rajan Kumar (author), Panda, Ramprasad (author), Panda, Nanda Kishor (author)

The widening gap between energy generation and demand on a global scale, coupled with the imperative to reduce emissions, has necessitated the development of largescale sustainable energy solutions. Among the various renewable energy options, Wind Power stands out as a viable source capable of generating substantial amounts of electricity....

conference paper 2023

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Cyber Forensic Analysis for Operational Technology Using Graph-Based Deep Learning

Presekal, A. (author), Stefanov, Alexandru (author), Subramaniam Rajkumar, Vetrivel (author), Palensky, P. (author)

The cyber attacks in Ukraine in 2015 and 2016 demonstrated the vulnerability of electrical power grids to cyber threats. They highlighted the significance of Operational Technology (OT) communication-based anomaly detection. Many anomaly detection methods are based on real-time traffic monitoring, i.e., Intrusion Detection Systems (IDS) that may...

conference paper 2023

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Future Dutch Electricity Grid: Assessing the Potential of Overplanting in Photovoltaic Systems

Reis, F.R. (author), Rueda, José L. (author), Palensky, P. (author), Gonzalez-Longatt, Francisco (author)

This paper concerns with the determination of a suitable level of overplanting for photovoltaic systems. For this purpose, six futuristic operational scenarios for the Dutch electrical power system are generated for year 2050. A synthetic model is developed by using DIgSILENT Power Factory 2022 SP3 to investigate the steady-state systemic...

conference paper 2023