Article
Automation & Control Systems
Jian Gao, Litao Dai, Xiao Liu, Xudong Du, Derong Luo, Shoudao Huang
Summary: This study investigates a small hydropower variable-speed generation technology, proposes a converter-fed synchronous generator system, and achieves multi-objective control through a multi-layer control system. By using an improved algorithm to automatically track the optimal speed under different inflow rates, the goal of significantly increasing the output of the VSO set is achieved.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Jaime W. Zapata, Gianluca Postiglione, Daniele Falchi, Giovanni Borghetti, Thierry A. Meynard, Guillaume Gateau
Summary: This article introduces a new transformerless multilevel converter topology, which consists of two Macro cells in series that can be extended to increase the number of output levels, along with one external selector cell. The converter topology allows the use of the same devices in different voltage applications and features zero-crossing among other benefits.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Multidisciplinary
Jose Manuel Guerrero, Gustavo Navarro, Kumar Mahtani, Carlos Platero
Summary: The presence of power electronics is essential in electrical systems with the use of variable speed drives. This article introduces a new method for detecting ground faults in variable speed drives, based on the analysis of the terminal voltage signal of a grounding resistor. The method was validated through numerous simulations and experimental tests on a 140-kW power converter, achieving satisfactory results.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Tor Inge Reigstad, Kjetil Uhlen
Summary: The article demonstrates the grid support capability of variable speed hydropower by improving frequency stability and transient rotor angle stability through virtual inertia, fast frequency reserves, and power oscillation damping. Dynamic simulations show that VSHP can significantly reduce maximum frequency deviation after sudden loss of generation, improve power oscillation amplitudes, and enhance critical fault clearing times.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2021)
Review
Mathematics
Aksher Bhowon, Khaled M. Abo-Al-Ez, Marco Adonis
Summary: This study used a systematic literature review to investigate the control methods used in wind energy conversion systems (WECS) and their limitations. The results showed that the primary means of frequency support in WECS is through the use of droop control-based emulated inertial response. This study is significant for the development of WECS and the stability of the transmission grid's frequency.
Article
Green & Sustainable Science & Technology
Andrey A. Achitaev, Konstantin V. Suslov, Alexander N. Nazarychev, Irina O. Volkova, Vyacheslav E. Kozhemyakin, Alexander A. Voloshin, Andrey V. Minakov
Summary: In the context of climate change, the adoption of renewable energy sources in isolated power systems is important. This paper presents research on the synchronous parallel operation of micro-hydroelectric power plants using permanent-magnet generators in an isolated power system with a controllable flexible coupling. The study addresses the issue of electromechanical compatibility in parallel operation of generators with different parameters. The proposed solution based on a controllable flexible coupling shows promise in solving this problem.
Article
Energy & Fuels
Shaoze Zhou, Binbin Li, Dianguo Xu, Gen Li
Summary: The modular multilevel converter (MMC) is a promising topology for medium-voltage drive applications. A hybrid MMC (HMMC) with a thyristor instead of IGBT as the DC-link switch is proposed to address the challenge of large cell capacitor voltage ripple. A new control scheme is proposed to ensure the safe operation of the thyristor and improve the reliability of HMMC. Experimental results validate the effectiveness of the proposed scheme for starting up a motor from standby mode to rated speed with full torque.
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
(2023)
Article
Green & Sustainable Science & Technology
Shiyi Zhao, Qinmin Yang, Peng Cheng, Ruilong Deng, Jinhui Xia
Summary: In this article, an adaptive resilient control scheme is proposed to address false data injection attacks on wind farms. A dynamic detection method and adaptive generator torque control strategy are implemented to ensure optimal power tracking and improve attack resilience.
IEEE TRANSACTIONS ON SUSTAINABLE ENERGY
(2022)
Article
Automation & Control Systems
Alexandre Christe, Alexander Faulstich, Michail Vasiladiotis, Peter Steinmann
Summary: This article provides detailed insights into the development and successful introduction of the first direct ac/ac modular multilevel converter (MMC) as a static frequency converter (SFC) for a converter-fed synchronous machine (CFSM) variable-speed pumped-storage hydropower plants (PSHPs). The use of a fully rated SFC decouples the grid dynamics from the machine dynamics, enabling straightforward variable-speed operation with high torque throughout the speed range. This results in a smaller machine compared to fixed-speed PSHPs, with the ability to control the synchronous machine at unity power factor over the entire speed range. The comprehensive measurement set obtained during the commissioning of the Malta Oberstufe plant in Austria confirms the suitability of a direct ac/ac MMC as an SFC for a CFSM variable-speed PSHP.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Computer Science, Information Systems
Miodrag Basic, Milan Utvic, Drazen Dujic
Summary: The study proposes the use of hybrid modular multilevel converter control and design to address the shortcomings of traditional half-bridge modular converter in pumped-hydro storage plants, enabling common-mode-voltage-free operation and down-to-zero DC voltage control. Compared to full-bridge design, the hybrid active front-end converter stage demonstrates lower losses and offers a trade-off between grid-side power factor range and full-bridge submodule share within the design stage.
Article
Thermodynamics
Lucas A. Militao, Caio D. Fernandes, Diego dos Santos, Douglas M. Machado, Marcelo L. Heldwein, Carlos R. Rambo, Alexandre K. da Silva, Jader R. Barbosa Jr
Summary: The study evaluated the passive cooling performance of a novel geometry for subsea variable speed drives, using seawater as a low-temperature thermal reservoir. The design achieved heat dissipation through buoyancy-induced motion of a dielectric coolant and optimal enclosure geometry was determined through a thermal network model and CFD simulation. Comparison between experimental data and modeling results showed good agreement with small deviations in RMS and temperature measurements.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Soufyane Benzaouia, Mohammed Mokhtari, Smail Zouggar, Abdelhamid Rabhi, Mohamed Larbi Elhafyani, Taoufik Ouchbel
Summary: This paper presents the design and implementation of a low-cost wind turbine emulator (WTE) aiming to simulate the nonlinear behaviors and characteristics of a real wind turbine accurately. By using a second-order sliding-mode speed observer and fuzzy logic technique, a sensorless WTE solution is proposed for closed-loop operation. Experimental results confirm the effectiveness of the proposed solution.
SUSTAINABLE ENERGY GRIDS & NETWORKS
(2021)
Article
Engineering, Electrical & Electronic
Dario Barsi, Robert Fink, Peter Odry, Marina Ubaldi, Pietro Zunino
Summary: Hydraulic energy is the most widely used renewable energy source for electricity generation. The development of reliable permanent magnet generators and power electronic converters has made it possible to regulate hydraulic turbines by varying the rotational speed. This regulation principle, combined with variable guide vane opening angle, can improve the hydraulic efficiency over a wide range of operating conditions. Although this approach cannot recover energy losses as effectively as the traditional double regulation method, it offers a simple and cost-effective solution, especially for applications with very low heads and powers.
Article
Chemistry, Multidisciplinary
Jingjing Zhang, Peng Cui, Jingjing Wang, Huan Meng, Ying Ge, Can Feng, Huimin Liu, Yao Meng, Zunkang Zhou, Ningning Xuan, Bao Zhang, Gang Cheng, Zuliang Du
Summary: This paper introduces a novel technology that utilizes porous structural materials to harness electricity from water evaporation. The paper-based hydroelectric generators (p-HEGs) offer simplicity in fabrication, low cost, and reusability. The study demonstrates the potential of electricity harvesting from water evaporation and establishes it as a viable method for renewable energy applications.
Article
Engineering, Multidisciplinary
Benedikt Spichartz, Katharina Guenther, Constantinos Sourkounis
Summary: With the expansion of the wind energy sector, the impact of wind turbines on grid stability is increasing. This article presents a control structure with power smoothing, constant droop, and a stabilizing limitation called MPP-limiter, which ensures the robust operational stability of the wind turbine.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2022)
Article
Thermodynamics
Dariusz Borkowski, Michal Wegiel, Pawel Oclon, Tomasz Wegiel
Article
Energy & Fuels
Dariusz Borkowski, Marek Majdak
Article
Energy & Fuels
Natalia Radwan-Praglowska, Tomasz Wegiel, Dariusz Borkowski
Summary: In this paper, the Harmonic Balance Method is applied to analyze the Axial Flux Permanent Magnet Generator, with the development of mathematical model equations to estimate machine properties in steady state operation. The study shows satisfactory convergence between calculated results and measurements, confirming the accuracy of the developed circuit models for diagnostic analyses, tests, and design process.
Article
Energy & Fuels
Dariusz Borkowski, Dariusz Cholewa, Anna Korzen
Summary: Hybrid hydro energy systems, utilizing run-of-the-river hydropower plants, PV systems, and batteries, were analyzed in this study. A dedicated steady-state model for run-of-the-river hydropower plants under different hydrological conditions was proposed. The study showed that a simplified method may overestimate energy production, and increasing the flow averaging period can significantly influence energy balance results.
Article
Energy & Fuels
Damian Liszka, Zbigniew Krzemianowski, Tomasz Wegiel, Dariusz Borkowski, Andrzej Polniak, Konrad Wawrzykowski, Artur Cebula
Summary: This paper proposes a solution to lower the investment costs of small hydropower plants by simplifying the integration of the turbine and generator. It suggests using a rare and cheap semi-Kaplan turbine and permanent magnet generator, along with a power electronic converter to improve reliability and eliminate expensive mechanical transmission.
Article
Energy & Fuels
Filip Bartyzel, Tomasz Wegiel, Magdalena Kozien-Wozniak, Marek Czamara
Summary: Due to the growing demand for new ecological, low-emission heat sources, there is a need to develop new tools for simulating heat pump operation parameters and costs. This article analyzes existing solutions, proposes a simulation tool based on refrigerant thermodynamic parameters, and introduces the requirements for a modern building-nZEB. The developed numerical script allows for reproducing the Linde refrigeration cycle and can simulate the annual performance and energy consumption of the heat pump.
Article
Energy & Fuels
Natalia Radwan-Praglowska, Tomasz Wegiel
Summary: This article explores the optimal magnet material selection for the Axial Flux Permanent Magnet Generator (AFPMG) using FEM and analytical analyses, eliminating the need for building a prototype. The researchers compared the performance of two types of magnets, Ceramic and Neodymium Iron Boron, through electromotive force and generator power analysis, as well as FFT analysis of voltages and currents, to determine the optimal solution.
Article
Engineering, Electrical & Electronic
Piotr Oramus, Dariusz Borkowski, Michal Brzezinka
Summary: This paper discusses technical-economic issues regarding sizing of Battery Energy System Storage for photovoltaic systems connected to the medium voltage distribution network. An algorithm for designing BESS parameters for collaboration with a PV farm is presented, considering technical-economic relations. The algorithm, based on a daily optimization module to maximize revenues, is implemented in MATLAB software. The presented results show optimized economic factors calculated based on PV farm parameters, energy price, and PV generation vector.
PRZEGLAD ELEKTROTECHNICZNY
(2023)
Article
Energy & Fuels
Dariusz Borkowski, Piotr Oramus, Micha l Brzezinka
Summary: Battery energy storage systems (BESS) are a solution to address the negative impact of renewable energy sources (RES) on power systems, and they can improve the profitability of renewables by shifting energy to a higher price interval in the daily market (DM). This study proposes a dedicated control strategy for PV-BESS to maximize the DM revenue. The effectiveness of the algorithm is demonstrated through an example of real 1 MW PV data, showing a significant increase in the rate of return of the energy storage using the additional control mode.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Natalia Radwan-Praglowska, Tomasz Wegiel, Dariusz Borkowski
Proceedings Paper
Engineering, Electrical & Electronic
Dariusz Borkowski, Dariusz Cholewa, Natalia Radwan-Praglowska, Jaroslaw Tulicki, Tomasz Wegiel
2019 15TH SELECTED ISSUES OF ELECTRICAL ENGINEERING AND ELECTRONICS (WZEE)
(2019)
Proceedings Paper
Construction & Building Technology
D. Borkowski, T. Wegiel
INTERNATIONAL CONFERENCE ON THE SUSTAINABLE ENERGY AND ENVIRONMENTAL DEVELOPMENT
(2019)
