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Modeling and control of an Aerogenerator Utilizing DFIG and Direct Matrix Converter Technology

Modeling and Control of an Aerogenerator Utilizing DFIG and ...

引用

Innovative Research in Applied Science, engineering and Technology (IRASET),Conference on

作者： Fatima-ezzahra Blouh Mohamed Bezza Ilyass El Myasse Department of Electrical Engineering Laboratory of Electronic Electrotechnical Automatic and Traitement of Information FST of Mohammedia Casablanca Morocco Department of Electrical Engineering Laboratory of Electrical Engineering and Intelligent Systems ENSET of Mohammedia Casablanca Morocco

ISBN: (数字)9798350309508

ISBN: (纸本)9798350309515

This paper explores the control challenges associated with wind energy conversion systems (WECS) incorporating a doubly fed induction generator (DFIG) powered by advanced converters. With the increasing prominence of power electronics, particular emphasis is placed on the utilization of a new generation of converters, specifically the AC/AC matrix converter. This converter offers direct AC/AC power conversion, bidirectional power flow, and nearly sinusoidal input and output waveforms. The study presented in this paper focuses on assessing the performance of a wind turbine equipped with a DFIG and powered by a matrix converter, which employs the maximum power point tracking technique to get the maximum power obtainable. The studied system is evaluated within the dq coordinates. The proposed control scheme is implemented, and its efficacy is assessed through simulation results using MatLab/Simulink.

关键词： Maximum power point trackers Simulation Wind speed Doubly fed induction generators Robustness Power electronics Wind turbines

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Ensuring Correct Relay Protection Functioning in Transient Modes With Saturation of Current Transformers

Ensuring Correct Relay Protection Functioning in Transient M...

引用

International Youth Scientific and Technical Conference on Relay Protection and Automation (RPA)

作者： A.V. Panashchatenko A.A. Yablokov Department of Electric Power Systems Automatic Control Ivanovo State Power Engineering University Ivanovo Russia

ISBN: (数字)9798331501105

ISBN: (纸本)9798331501112

Electromagnetic current transformers, invented more than 100 years ago, are today the most widespread type of preliminary current converters, used in organizing metrological channels for commercial and technical electricity metering, measuring and relay protection systems. Despite their relatively simple design and modest price, today the question of using unconventional preliminary current converters (Rogowski coils, optical transformers, galvanic-magnetic sensors) is being increasingly raised [1]. This situation is due to the shortcomings of electromagnetic current transformers (CT): large weight and dimensions), explosion and fire hazard, and also saturation of their magnetic conductor in transient modes with the presence of an aperiodic component in short circuiting (SC) current. The phenomenon of saturation leads to significant distortion of the transmitted secondary signal, which in turn may become the cause of overprotection with external SC or delayed protection with internal SC. Russian and international practice in coordinating CT characteristics and relay protection requirements presuppose ensuring correct operation of relay protection systems not only in steady, but also in transient modes with possible saturation of CT magnetic conductors [2]–[5]. At present, testing the correct operation of relay protection and automation devices (RPAD) in transient modes is carried out using the CT saturation time, which under the specific conditions of the location of the CT should be more than the exact current conversion time required for correct operation of the connected RPAD. This time is calculated by special approved methods [2]. Such use of two extreme CT magnetic conductor conditions (saturated/unsaturated), without regard to the current waveform itself may lead to significant inaccuracies in evaluating the correctness of RPAD operation. Fig 1 shows two instances of saturation in one and the same CT in different operating conditions and with the same time be

关键词： Current transformers Protective relaying Conductors Circuit faults Optical sensors Transient analysis Electromagnetics Saturation magnetization Fault currents Testing

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Data-driven modeling of heat pumps and thermal storage units for MPC

Data-driven modeling of heat pumps and thermal storage units...

引用

2023 International Conference on the Built Environment in Transition, CISBAT 2023

作者： Brandes, M. Cai, H. Vivian, J. Croci, L. Heer, P. Smith, R. Urban Energy Systems Laboratory Empa Dübendorf Switzerland Dept. of Industrial Engineering University of Padova Padua Italy Dept. of Power System Development Ricerca Sistema Energetico SpA Milan Italy Automatic Control Laboratory Department of Electrical Engineering and Information Technology ETH Zurich Switzerland

Heat pumps can play a crucial role in the European energy strategy 2050, which aims to achieve net-zero greenhouse gas emissions. When coupled with thermal energy storage and integrated with advanced control strategies, heat pump operation can be optimized to reduce carbon footprint and respond to the needs of system operators. However, to scale in a multitude of buildings, the transferability of the modeling into heterogeneous systems is crucial. In this paper, two different interpretable linear models, a hybrid (grey-box) and a fully data-driven (black-box) model are investigated. Specifically, two regression-based identification methods (SINDYc and DMDc) are used for dynamic models and the LASSO regression is used for static models. The transferability of the approach is evaluated using two real-world facilities with heterogeneous sizing and configuration. The results show a similar simulation performance for both cases with a maximum normalized RMSE of 0.41 and 0.60, respectively. This confirms the transferability of the approach that is necessary for large-scale implementation. © 2023 Institute of Physics Publishing. All rights reserved.

关键词： Carbon footprint

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Environment-Modulated Self-Assembly by Changes in Modules’ Buoyancy

Environment-Modulated Self-Assembly by Changes in Modules’ ...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Xiao Chen Junyi Han Xin Jin Shuhei Miyashita Automatic Control and Systems Engineering Department University of Sheffield Sheffield UK Insigneo Institute for in Silico Medicine

ISBN: (数字)9798350384574

ISBN: (纸本)9798350384581

While many inkjet printers employ only four types of ink (i.e. CKMY) to produce a wide range of colors, numerous technical challenges still exist for contemporary 3D printers to fabricate various materials and generate composite products such as electric devices. Conversely, there have been attempts and endeavors to make things through self-assembly of parts, analogous to the autonomous and decentralized development process of the human body from just 20 types of amino acids. In our previous work, we proposed a method for the rapid production of 3D objects using the centimeter-sized modules (referred to as Roblets) capable of generating a 2D structure and subsequently self-folding themselves into a 3D configuration, akin to origami. To further leverage the capability of generating a wide variety of different types of structures by combining different modules, this research studies a method of automatically selecting and supplying modules using environmental cues. More precisely, we developed a mechanism to couple different modules corresponding to three different environments (on a flat surface, on low-dense saline, and on saturated saline) and yielded different module configurations. The process of self-assembly necessitated the application of perturbation, which was realized by imparting magnetic torque originating from an external magnetic field onto the magnets embedded in the modules.

关键词： Self-assembly Three-dimensional displays Torque Buoyancy Production Magnetic fields Printers

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Assessment of the Digital Measuring Transformers Application in Power Distribution Zone

Assessment of the Digital Measuring Transformers Application...

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International Russian Automation Conference (RusAutoCon)

作者： Galina Filatova Vladimir Lebedev Andrey Tolstoukhov Automatic control of electric power systems department Ivanovo State Power Engineering University Ivanovo Russia

ISBN: (数字)9798350349818

ISBN: (纸本)9798350349825

Combined digital measuring current and voltage transformers (DCVTs), developed at Ivanovo State Power engineering University (ISPEU), are innovative products. The researchers have accumulated some operating experience of devices in existing electrical installations and experience in numerous laboratory tests. At the same time, a number of aspects of the DCVT use still remain the subject of research, for example, the functioning of DCVTs as a primary sensor for protection against single-phase ground faults (SPGFs). It is also necessary to evaluate the effect of the introduction of DCVTs in the overhead networks of power distribution zones (PDZs), primarily from the point of view of reducing the costs of searching for the location of the SPGFs. The procedure for searching for an electrical fault using the functions built into DCVT 6 -10 kV is described. The article describes the effects of the introduction of DCVTs in 6–10 kV distribution zones, and also provides criteria that allow us to assess in which cases the use of DCVTs and technologies based on them will be most beneficial.

关键词： Power measurement Costs Automation Electricity Power distribution Distribution networks Transformers Data models Circuit faults Integrated circuit modeling

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Electric three-wheel chassis 14

Electric three-wheel chassis

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14th International Conference ELEKTRO, ELEKTRO 2022

作者： Mihalik, Michal Malobicky, Branislav Hrubos, Marian Kanalikova, Alzbeta University of Žilina Faculty of Electrical Engineering and Information Technology Department of Control and Information Systems Žilina Slovakia

ISBN: (纸本)9781665467261

This science work deals with the manufacture and control of a differential mobile chassis for the needs of Simultaneous Localization and Mapping. In the introduction, we present the issue of the SLAM (Simultaneous localization and mapping) algorithm as the way through which we want to implement the production and control of the differential chassis. In the next part, we deal with the implementation of the mobile platform of the future chassis where the configuration of one fixed drive axle was used, with two wheels and one freewheel, which indicates the direction of the chassis. This assembly is managed using the Raspberry Pi platform. © 2022 IEEE.

关键词： Chassis

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Simulation of Arc Erosion on the Main Contact of On-Load Tap Changer 4th

Simulation of Arc Erosion on the Main Contact of On-Load Tap...

引用

4th International Symposium on Insulation and Discharge Computation for Power Equipment, IDCOMPU 2023

作者： Zhou, Yuanxiang Dai, Yasong Chen, Jianning Li, Yuhang Hou, Xuzhao Zhang, Zhen State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100084 China The Wind Solar Storage Division of State Key Laboratory of Power System and Generation Equipment School of Electrical Engineering Xinjiang University Urumqi830047 China

ISBN: (纸本)9789819974047

Long-term operation and switching of transformer on-load tap-changers can cause degradation and deterioration of the main contact material, even leading to contact arcing damage in severe cases. However, the arcing mechanism of the main contact during the switching has not been clarified yet. A magneto-hydrodynamic simulation method of main contact arcing has been proposed. The geometry of the main contact in transformer oil is simplified, and the simulation model of the arc temperature field of the main contact in transformer oil coupled with electric, magnetic, thermal and fluid fields is proposed. The dynamic evolution of the arc temperature has been investigated at peak currents of 2100 A, 1500 A, 600 A and 300 A, respectively. The results show that with the increase of the spacing between contacts, the temperature at arc core rises rapidly and then decreases slowly, and the temperature can reach 50177 K at 2100A. Due to the electron bombardment at the anode surface, the temperature at anode surface is higher than that at cathode surface under different chopped currents. The highest temperatures at anode and cathode surface can reach 4142.5 K and 4081.7 K respectively. © Beijing Paike Culture Commu. Co., Ltd 2024.

关键词： Deterioration

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On Convergence in Distribution of Stein's Unbiased Risk Hyper-parameter Estimator for Regularized System Identification 41

On Convergence in Distribution of Stein's Unbiased Risk Hype...

引用

第41届中国控制会议

作者： Yue Ju Tianshi Chen Biqiang Mu Lennart Ljung School of Data Science and Shenzhen Research Institute of Big Data The Chinese University of Hong Kong Key Laboratory of Systems and Control Institute of Systems ScienceAcademy of Mathematics and System ScienceChinese Academy of Sciences Division of Automatic Control Department of Electrical EngineeringLink?ping University

ISBN: (数字)9789887581536

ISBN: (纸本)9781665482561

Asymptotic theory for the regularized system identification has received increasing interests in recent *** this paper,for the finite impulse response(FIR) model and filtered white noise inputs,we show the convergence in distribution of the Stein's unbiased risk estimator(SURE) based hyper-parameter estimator and find factors that influence its convergence *** particular,we consider the ridge regression case to obtain closed-form expressions of the limit of the regression matrix and the variance of the limiting distribution of the SURE based hyper-parameter estimator,and then demonstrate their relation numerically.

关键词： Asymptotic theory Stein's unbiased risk estimator Hyper-parameter estimator Regularized system identification

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Pneumonia Detection from X-ray Images Using Convolutional Neural Networks

Pneumonia Detection from X-ray Images Using Convolutional Ne...

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International Conference on control systems and Computer Science (CSCS)

作者： Viorel Dediu Andreea Udrea Department of Automatic Control and Systems Engineering Faculty of Automatic Control and Computer Science Univesity Politehnica of Bucharest Bucharest Romania

Pneumonia is one of the top causes of death in Romania and early detection of this disease improves the recovery chances and shortens the length of hospitalization. In this work, we develop a solution for automatic pneumonia detection based on convolutional neural networks. Four network models are investigated. They are trained on 4.163 images from a public dataset and tested on 530 images. The best results are obtained by one of the proposed models conducting to a sensitivity of 98.72%, an accuracy of 89.81%, and ROC 93.46%. Thus, this research proposes a lightweight screening tool that can help triaging the patients with pneumonia.

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Comparison of Various Mathematical Models of 8/20 μs Current Surge and their Influence on RFID Marker 14

Comparison of Various Mathematical Models of 8/20 μs Curren...

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14th International Conference ELEKTRO, ELEKTRO 2022

作者： Vestenicky, Peter Kanalikova, Alzbeta University of Žilina Faculty of Electrical Engineering and Information Technology Department of Control and Information Systems Žilina Slovakia

ISBN: (纸本)9781665467261

In technical praxis the underground facility networks such as gas and water pipes or telecommunication and energetic cables are marked by special RFID markers to enable localization and identification of the network. Due to influence of climatic effects such as lightning part of the lightning surge current may be induced into the markers. This paper gives a comparison of various mathematical models of the surge current induced into conductors and these mathematical models are used to calculate current waveform in the markers. Finally, the voltage waveform across the capacitor in the marker resonant circuit is calculated to enable proper dimensioning of the capacitor and to increase the long term marker reliability. © 2022 IEEE.

关键词： Differential equations

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