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检索条件"机构=Systems Engineering and Automatic Control"

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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...

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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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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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Nonlinear Identification for control by Using HARMAX Models

Nonlinear Identification for Control by Using HARMAX Models

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International Conference on control, Decision and Information Technologies (CoDIT)

作者： Janetta Culita Dan Stefanoiu Andreea-Maria Nica Department of Automatic Control and Systems Engineering University “Politehnica” of Bucharest Romania Faculty of Automatic Control and Computers University “Politehnica” of Bucharest Romania

The purpose of this article is to perform a comparison between two identification models: a nonlinear one referred to as HARMAX and a classical linear one, of Box-Jenkins (BJ) type. The first model modifies a classical ARMAX model by applying Hammerstein polynomials on input, output, and noise signals. Identification of models was performed by means of Multi-Step Least Squares Method, as described into the article. The simulations on a real-world plant, namely ASTANK2, a fluidic system with two inputs, two outputs and nonlinear static characteristic, have proven that the HARMAX model performs better than the BJ model and provides more accurate useful models to be integrated into closed loop configurations.

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Measurement of Reflection and Shielding Effectiveness of Electromagnetic Fields in Construction Materials with Subsequent Calculation of Absorption 5

Measurement of Reflection and Shielding Effectiveness of Ele...

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5th IEEE International Conference on Modern Electrical and Energy System, MEES 2023

作者： Pavlik, Marek Melnykov, Viacheslav Technical University of Košice Department of Electric Power Engineering Košice Slovakia Kremenchuk Mykhailo Ostrohradskyi National University Department of Systems of Automatic Control and Electric Drive Kremenchuk Ukraine

ISBN: (纸本)9798350359787

In today's world of wireless technologies, we observe a proliferation of devices that communicate and operate wirelessly. All these devices emit electromagnetic radiation, which also penetrates the human body. Given the current technologies, it is not possible to completely prevent the impact of electromagnetic radiation on humans. However, we can mitigate the effects of electromagnetic radiation by choosing the right shielding material. One natural shielding material, for example, is a building. Therefore, in this article, we focused on research in the field of electromagnetic field shielding, reflection, and absorption in building structures. The article describes a measurement method for determining the effectiveness of shielding and reflection of electromagnetic fields. Subsequently, based on these measurements, the absorption of electromagnetic fields can be calculated. © 2023 IEEE.

关键词： Electromagnetic fields

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Development of an "Artificial Lung" System for Use in Indoor Air Quality Testing 21st

Development of an "Artificial Lung" System for Use in Indoor...

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21st Polish control Conference, PCC 2023

作者： Kozyra, Andrzej Lipczynska, Aleksandra Koper, Piotr Babisz, Radoslaw Madej, Damian Nowakowski, Konrad Karwatka, Jakub Tomczok, Dominik Department of Measurements and Control Systems Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Gliwice Poland Department of Heating Ventilation and Dust Removal Technology Faculty of Energy and Environmental Engineering Silesian University of Technology Gliwice Poland

ISBN: (纸本)9783031351693

"Artificial lung" is a device that simulates breathing process of occupants in a room. This allows you to safely test, e.g., the impact of HVAC systems on the spread of pathogens. The paper describes the concept of the device, its construction and performed tests. The project was implemented by students of two faculties: automatic control, Electronics and Computer Science, and Energy and Environmental engineering. Project supervisors from both faculties provided substantive supervision and support for students. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2023.

关键词： Air quality

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Processing Signals in Digital Current Measuring Transformers to Quickly Obtain the Vector for RPA Purposes

Processing Signals in Digital Current Measuring Transformers...

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International Conference on Industrial engineering, Applications and Manufacturing (ICIEAM)

作者： Vladimir D. Lebedev Denis G. Grigorev Nataliya V. Kuzmina Department of Electric Power Systems Automatic Control Ivanovo State Power Engineering University Ivanovo Russia

ISBN: (数字)9798350395013

ISBN: (纸本)9798350395020

In the development of secondary systems of stations and substations, including relay protection, automation, control, electric power metering and other features, there have recently been qualitative changes related to the introduction of digital technologies. The introduction of digital technologies is supported by innovative development programmes such as «Digital Transformation 2030». The essence of introducing digital technologies is related to the use of digital data transmission channels according to common standards. “Digital substation” projects are being actively implemented with transmission of digital information at all levels, starting with primary equipment, including transmission of information, both from current and voltage measuring transformers, and switchgear. Currently, digital measuring transformers are being actively developed and beginning to be introduced, in which information on measured current and voltage is presented in a digital code. New approaches to measuring primary current and voltage, and the transmission of information pose new challenges and open up new prospects of improving signals processing methods used for relay protection purposes. This determines the relevance of the objective of our research - developing and studying approaches to the digital processing of signals in digital current and voltage measuring transformers. As a result, the approach to determining synchronized values of current vectors was studied by processing information obtained from primary current converters. The characteristics of the algorithm for obtaining the vector were analyzed, and the dependences of errors on the influence of distorting factors were plotted. The proposed approach to obtaining the vector is a development of the existing approach by obtaining information from current sensors operating on different physical principles. The study shows the advantages of the proposed method.

关键词： Voltage measurement Substations Current measurement Signal processing algorithms Protective relaying Transformers Vectors

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Narrow gap TIG arc weld process monitoring 27

Narrow gap TIG arc weld process monitoring

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27th International Conference on Automation and Computing, ICAC 2022

作者： Gambrill, Nathan Farnsworth, Michael Shaw, Rob Tedeschi, Stefano Tiwari, Divya Tiwari, Ashutosh The University of Sheffield Department of Automatic Control and Systems Engineering Sheffield United Kingdom The Welding Institute Ltd Abington Cambridge United Kingdom

ISBN: (数字)9781665498074

ISBN: (纸本)9781665498074

Joining processes play a critical role across several industries and manufacturing activities. One such activity is narrow gap TIG arc welding, present in a number of high value manufacturing domains the quality and outcomes are highly dependent on the operating parameters and the evolving state of the weld. Human supervision, and the application of vision systems to allow the operator to monitor the process as it is being undertaken is commonplace, however monitoring, characterisation and feedback in narrow gap use cases is less so. The work undertakes a comparative study into two different approaches to process monitoring of TIG arc welding. The first through more traditional machine vision (MV) methods, and the second through more modern deep neural network methods. Results show both methods developed are able to perform the role of process monitoring and defect detection with accuracy of 82% and 93% for the traditional and DNN methods respectively. © 2022 IEEE.

关键词： Deep neural networks

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Assessing Uncertainty in Space Weather Forecasting Using Quantile Regression and Complex Nonlinear systems Identification Techniques

Assessing Uncertainty in Space Weather Forecasting Using Qua...

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International Conference on Computing, Electronics & Communications engineering (iCCECE)

作者： Hua-Liang Wei Michael A. Balikhin Richard J. Boynton Simon N. Walker Dept. of Automatic Control and Systems Engineering The University of Sheffield Sheffield UK

Space weather forecasting is of global interest, and its importance is well established in research community and recognized by government, industries and stockholders. Over the past years, many types of predictive models have been developed in the literature. There is a general agreement that forecasting models should not only provide point prediction but also inform the uncertainty associated with the prediction. This study presents a novel method bases on quantile regression and complex dynamic modelling for measuring uncertainties in space weather forecasting. The approach is implemented using Quantile regression and Nonlinear AutoRegressive Moving Average with Exogenous inputs (NARMAX) methods (for short the approach is called Q-NARMAX). The method is applied to Disturbance storm index (Dst) observations to examine its interpretability and capability for uncertainty analysis. Results show that the proposed Q-NARX model can produce excellent predictions of the Dst index, and meanwhile provides a measure for assessing the uncertainty in the forecast. The innovative integration of quantile regression, complex dynamic modelling and nonlinear system identification techniques enables the proposed work to have following attractive advantages and properties: 1) it can produce excellent prediction accuracy for space weather forecasting, 2) it uses transparent models to approximate (represent) black-box systems, enabling to interpret the dependent relationship between space weather indices (system outputs) and their drivers (system inputs), and 3) more importantly, it allows for uncertainty assessment and analysis of models and forecasts.

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Computing the explicit MPC solution using the Hasse diagram of the lifted feasible domain

Computing the explicit MPC solution using the Hasse diagram ...

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European control Conference (ECC)

作者： Ştefan S. Mihai Florin Stoican Bogdan D. Ciubotaru Department of Automatic Control and Systems Engineering University “Politehnica” of Bucharest Bucharest Romania

This paper provides a combinatorial interpretation for the explicit solution of the quadratic cost, linear-constrained MPC (model predictive control) problem. We link the Hasse diagram of the lifted feasible domain with the critical regions which partition the parameter space and serve as polyhedral support for the piecewise affine explicit MPC solution.

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