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International Youth Conference on Radio Electronics, electrical and Power engineering (REEPE)

作者： Dmitriy Sharygin Galina Filatova Andrey Yablokov Department of electric power systems automatic control Ivanovo State Power Engineering University (ISPU) Ivanovo Russia

The existing normative and technical documentation of operating organizations does not allow for the reliable organization of the minimal possible inspection zone. The article presents research on the implementation of justified inspection zone for fault location on overhead transmission lines of 110 kV and above. The fault location research was carried out on an imitation model in the Simulink / MATLAB software package. Fault location formulae developed by the authors were used under consideration of multitude factors influencing the measurement using the Monte Carlo method. Only the methodological error of fault location was taken into account in the calculation for the implementation of the inspection zone. The most probable (justified) inspection zone was calculated based on the values of fault locations obtained using the calculation formulae. The generalized Gaussian distribution (GGD) and the functions of mathematical expectation and standard deviation were used to implement the justified inspection zone.

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A suite of MATLAB livescript files to support learning of elementary control and feedback concepts

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IFAC-PapersOnLine 2023年第2期56卷 7555-7560页

作者： J.A. Rossiter Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD UK

This paper builds on a body of work in the community which is focussed on sharing learning and teaching resources, especially those which might support a first course in control. Here attention is given to some of the mathematical, analytical and numerical computations which are required to support simple system and feedback analysis and design. The aim is to provide resources which allow students to focus on core concepts and understanding so that the numerical computations are not an obstacle to their investigations. More specifically, this paper focuses on a number of MATLAB livescript files which have been produced to help students visualise the impact of parameter and design choices on system behaviour, while simultaneously empowering them to understand the source code and thus upskill them for the future. The paper gives an overview of the livescripts available so users can decide whether these could be useful in their own context; all are freely available on the author's website (Rossiter, 2021).

关键词： Virtual laboratories independent learning visualisation livescripts

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Robust Synchronization of Uncertain Physically Coupled Heterogeneous Linear Agents 63

Robust Synchronization of Uncertain Physically Coupled Heter...

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63rd IEEE Conference on Decision and control, CDC 2024

作者： Namba, Takumi Ahmed, Saeed Takaba, Kiyotsugu Ritsumeikan University Department of Electrical and Electronic Engineering 1-1-1 Noji-Higashi Shiga Kusatsu Japan University of Groningen Jan C. Willems Center for Systems and Control Enteg Faculty of Science and Engineering Groningen9747AG Netherlands

ISBN: (纸本)9798350316339

control of multi-agent systems with physical couplings is motivated by their engineering applications, such as multiple mass-spring-damper systems, power grids, etc., in which each agent not only has information communication but also physical interactions with its neighboring agents. This paper studies robust synchronization problem for uncertain linear agents with physical couplings. We consider the situation where the heterogeneity in agent models is viewed as a memoryless and time-varying parametric uncertainty and where the physical coupling is also considered to be uncertain but norm bounded. Notably, considering these physical couplings to be uncertain makes the robust synchronization problem much more challenging compared to the physically decoupled case. In fact, unlike physically decoupled cases, it is generally difficult to analytically derive synchronization conditions for controller synthesis even if the agents are homogeneous. To this end, we employ a scaled small-gain approach to derive a robust synchronization condition for controller synthesis in terms of linear matrix inequalities. © 2024 IEEE.

关键词： Synchronization

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Disturbance Observer-Based Optimal Tracking control for Slot Coating Process with Mismatched Input Disturbances

Disturbance Observer-Based Optimal Tracking Control for Slot...

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UKACC International Conference on control (control)

作者： Zezhi Tang Christopher Passmore J Anthony Rossiter Stephen Ebbens Gary Dunderdale George Panoutsos Department of Automatic Control and Systems Engineering University of Sheffield Department of Chemical and Biological Engineering University of Sheffield Sustainable Aviation Fuels Innovation Centre Sheffield

ISBN: (数字)9798350374261

ISBN: (纸本)9798350374278

Slot coating is a widely used technique in various manufacturing processes. The efficiency of the process mostly depends on the precise control of diverse inputs such as pump rate and gap. However, this method can be sensitive to minor disturbances in process conditions, which can disrupt the uniformity of the film thickness. To overcome the challenge, through the implementation of the generalized disturbance observer and compensator, the impact of disturbances can be attenuated in the output channel. In addition, by combining with an output tracking controller, the proposed composite architecture effectively compensates the disturbances while guaranteeing the tracking of the specified film thickness across a wide range of situations. The simulation results were illustrated to showcase the effectiveness of the disturbance observer-based optimal tracking control (DOBOTC) system.

关键词： Manufacturing processes Simulation Perturbation methods Process control Disturbance observers Coatings Closed loop systems

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Towards Empirical Transfer Function Estimation for Frequency Domain Closed-loop System Identification

Towards Empirical Transfer Function Estimation for Frequency...

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

作者： Amirreza Zaman Dina Shona Laila Wolfgang Birk Department of Computer Science Electrical and Space Engineering Automatic Control Group Luleå University of Technology Luleå Sweden

ISBN: (数字)9798350373974

ISBN: (纸本)9798350373981

This work introduces a method for closed-loop system identification using frequency analysis, employing Empirical Transfer Function Estimation (ETFE). By integrating optimization within a Monte Carlo framework, it enhances the precision of ETFE, resulting in minimized frequency response errors compared to actual system data. Leveraging controller information in an offline model fitting scheme, it achieves optimal realization of process dynamics. The method is evaluated on a data center rack-level cooling system, showing Bode magnitude plots of actual and estimated closed-loop and open-loop dynamics, with confidence intervals demonstrating algorithm consistency. Numerical evaluations confirm the feasibility and potential of the approach to improve offline closed-loop system identification performance in the frequency domain, beneficial for analysis and design. There will not be a comparative study for the introduced approach.

关键词： Monte Carlo methods Heuristic algorithms Fitting Transfer functions Estimation Process control Numerical models Closed loop systems Iterative methods Optimization

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Energy-balancing dual-port grid-forming control for VSC-HVDC systems

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IFAC-PapersOnLine 2023年第2期56卷 6447-6452页

作者： Irina Subotić Dominic Groß Automatic Control Laboratory ETH Zürich Switzerland Department of Electrical and Computer Engineering University of Wisconsin-Madison USA

This work examines energy-balancing dual port grid-forming (GFM) control for high-voltage direct current (HVDC) transmission. In contrast to the state-of-the-art, HVDC converters controlled in this way do not require assigning GFM and grid-following roles to different converters. Moreover, this control enables primary frequency control and inertia support through HVDC links. A detailed stability and steady-state analysis results in conditions on the control gains such that i) the overall hybrid dc/ac system is stable, ii) asynchronous ac areas are quasi-synchronous, and iii) circulating power in cyclic topologies is avoided. Finally, a high-fidelity case study is used to illustrate and verify the analytical results.

关键词： Power systems Power systems stability Grid-forming control HVDC transmission

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Oligopoly Game Stabilisation Through Multilayer Congestion Dynamics

arXiv

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arXiv 2024年

作者： Willis, Toby Punzo, Giuliano Department of Automatic Control and Systems Engineering University of Sheffield Street South Yorkshire Sheffield100190 United Kingdom

International trade and logistics are subject to factors including geopolitical instability, climate change, and black swan events such as the unforeseen closure of the Suez Canal. The problem of predicting local price change under modification of an underlying transport network or change in supply characteristics unites elements of game theory, network theory and transport. The Cournot Oligopoly models economic actors as rational players attempting to maximise profit by optimising supply quantities with analytical results now consolidated about equilibrium characteristics where transport conditions are fixed. Similarly, where supply and demand are fixed, the routing of goods in a transport network can be analytically solved through a traffic assignment problem. Hence we can solve the coupled Cournot-congestion problem by means of a 2-layer network. Where the layers are linked, inter-layer feedback wherein players attempt to maximise their utility occurs. In this respect we find players benefit from taking advantage of non-simultaneous responses to the market rather than moving to a new equilibrium. We draw conclusions about the nature of equilibria, finding that the concave utility curve property results in unique and stable equilibrium for each uncoupled layer, while linked layers have a non-unique stable equilibria for which general solutions are stated. © 2024, CC BY.

关键词： International trade

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Finite Sample Frequency Domain Identification

Finite Sample Frequency Domain Identification

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IEEE Conference on Decision and control

作者： Anastasios Tsiamis Mohamed Abdalmoaty Roy S. Smith John Lygeros Department of Information Technology and Electrical Engineering ETH Zürich Automatic Control Laboratory Zürich Switzerland

ISBN: (数字)9798350316339

ISBN: (纸本)9798350316346

We study non-parametric frequency-domain system identification from a finite-sample perspective. We assume an open loop scenario where the excitation input is periodic and consider the Empirical Transfer Function Estimate (ETFE), where the goal is to estimate the frequency response at certain desired (evenly-spaced) frequencies, given input-output samples. We show that under sub-Gaussian colored noise (in timedomain) and stability assumptions, the ETFE estimates are concentrated around the true values. The error rate is of the order of $\mathcal{O}\left(\left(d_{u}+\sqrt{d_{u} d_{y}}\right) \sqrt{M / N_{\text {tot }}}\right)$, where $N_{\text {tot }}$ is the total number of samples, M is the number of desired frequencies, and $d_{u}, d_{y}$ are the dimensions of the input and output signals respectively. This rate remains valid for general irrational transfer functions and does not require a finite order state-space representation. By tuning M, we obtain a $N_{\text {tot }}^{-1 / 3}$ finite-sample rate for learning the frequency response over all frequencies in the ${\mathcal{H}}_{\infty}$ norm. Our result draws upon an extension of the Hanson-Wright inequality to semi-infinite matrices. We study the finite-sample behavior of ETFE in simulations.

关键词： Error analysis Frequency-domain analysis Transfer functions Frequency response Stability analysis Frequency estimation System identification Linear matrix inequalities Colored noise Tuning

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Automated Method for the Research of the Relay Protection Function Implemented in 6(10) kV Digital Instrument Transformers Using Real Oscillograms

Automated Method for the Research of the Relay Protection Fu...

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International Russian Automation Conference (RusAutoCon)

作者： Galina Filatova Dmitry Piskunov Alexey Evdakov Department of electric power systems automatic control Ivanovo State Power Engineering University (ISPU) Ivanovo Russia

ISBN: (数字)9798350349818

ISBN: (纸本)9798350349825

The increasing of automation and digitization of 6(10) kV distribution networks remains a relevant task. The solution of this task may be associated with the widespread implementation of digital instrument transformers and devices based on them. The article is dedicated to the development of a methodology of the function for determining the faulted section at a single-phase ground fault (SPGF) implemented in a digital instrument transformer 6(10) kV. The methodology involves the modeling of electromagnetic transient processes on the Real Time Digital Simulator (RTDS). The research is carried out on a model of a 10 kV electrical network area with the simulation of various types of single-phase ground faults (e.g. arc faults). The model parameters are varied automatically using a «script». Additionally, a database of real oscillograms containing single phase to ground faults is created to validate the function. The article discusses the main features of data collection and processing specific to the electrical energy sector. The oscillograms obtained from models and real energy objects will be used for conducting high-voltage laboratory tests of digital instrument transformers and the faulted section determination function. The test facility diagram is presented in the article.

关键词： Instrument transformers Automation Test facilities Sensitivity Computational modeling High-voltage techniques Distribution networks Real-time systems Steady-state Reliability

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Urban Traffic Congestion control: A DeePC Change

Urban Traffic Congestion Control: A DeePC Change

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European control Conference (ECC)

作者： Alessio Rimoldi Carlo Cenedese Alberto Padoan Florian Dörfler John Lygeros Department of Electrical Engineering and Information Technology Automatic Control Laboratory ETH Zürich Zürich Switzerland

ISBN: (数字)9783907144107

ISBN: (纸本)9798331540920

Urban traffic congestion remains a pressing chal-lenge in our rapidly expanding cities, despite the abundance of available data and the efforts of policymakers. By leveraging behavioral system theory and data-driven control, this paper exploits the Data-enabled Predictive control (DeePC) algorithm in the context of urban traffic control performed via dynamic traffic lights. To validate our approach, we consider a high-fidelity case study using the state-of-the-art simulation software package Simulation of Urban MObility (SUMO). Preliminary results indicate that DeePC outperforms existing approaches across various key metrics, including travel time and CO 2 emissions, demonstrating its potential for effective traffic management.

关键词： Measurement Software packages Heuristic algorithms Urban areas Software algorithms Pressing Traffic control

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