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TPP Generating Unit Technical and Economic Index Accuracy Increase 2

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TPP Generating Unit Technical and Economic Index Accuracy In...

2nd International Youth Conference on Radio Electronics, Electrical and Power engineering, REEPE 2020

作者： Arakelyan, E.K. Boldyrev, I.A. Gorban, Y.A. National Research University 'MPEI' Department of automated control systems for thermal processes Moscow Russia National Research University 'MPEI' Department of heat power and heat engineering Volzhsky Russia

ISBN: (纸本)9781728156552

Calculation of technical and economic indicators (TEI) at TPP that are equipped with automated information-measuring systems (IMS) is carried out, as a rule, automatically. In this case, the values are obtained with a period of 15 minutes based on the current values of the process parameters averaged over this period. An approach is proposed to increase the accuracy of determining the values of operational TEC, including reducing the static and dynamic components of uncertainty, using the example of the gross coefficient of a boiler unit. The application of the described methods leads to a reduction in uncertainty, more rapid obtaining of TEC values, which favorably affects the equipment control mode. © 2020 IEEE.

关键词： accuracy analysis automated control system error technical and economic indexes

TOWARDS RELIABLE DATA-BASED OPTIMAL AND PREDICTIVE control USING EXTENDED DMD

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arXiv 2022年

作者： Schaller, Manuel Worthmann, Karl Philipp, Friedrich Peitz, Sebastian Nüske, Feliks Technische Universität Ilmemau Institute of Mathematics Optimization-based Control Group Germany Paderborn University Department of Computer Science Data Science for Engineering Germany Max Planck Institute for Dynamics of Complex Technical Systems Magdeburg Germany

While Koopman-based techniques like extended Dynamic Mode Decomposition are nowadays ubiquitous in the data-driven approximation of dynamical systems, quantitative error estimates were only recently established. To this end, both sources of error resulting from a finite dictionary and only finitely-many data points in the generation of the surrogate model have to be taken into account. We generalize the rigorous analysis of the approximation error to the control setting while simultaneously reducing the impact of the curse of dimensionality by using a recently proposed bilinear approach. In particular, we establish uniform bounds on the approximation error of state-dependent quantities like constraints or a performance index enabling data-based optimal and predictive control with guarantees. Copyright © 2022, The Authors. All rights reserved.

关键词： Dynamic mode decomposition

Singularity and similarity detection from signals using wavelet transform

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arXiv 2021年

作者： Wei, Hua-Liang Billings, S.A. Department of Automatic Control and Systems Engineering The University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom

The wavelet transform and related techniques are used to analyze singular and fractal signals. The normalized wavelet scalogram is introduced to detect singularities including jumps, cusps and other sharply changing points. The wavelet auto-covariance is applied to estimate the self-similarity exponent for statistical self-affine signals. © 2021, CC BY-NC-ND.

关键词： Wavelet transforms

A formal process of hierarchical functional requirements development for Set-Based Design

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arXiv 2022年

作者： Sun, Minghui Chen, Zhaoyang Bakirtzis, Georgios Jafarzadeh, Hassan Fleming, Cody Coordinated Systems Lab Department of Mechanical Engineering Iowa State University AmesIA50011 United States Autonomous Systems Group Oden Institute for Computational Engineering & Sciences The University of Texas at Austin AustinTX78712 United States Advanced Control Methods Research and Advanced Engineering Ford Motor Company DearbornMI48126 United States

The design of complex systems is typically uncertain and ambiguous at early stages. Set-Based Design is a promising approach to complex systems design as it supports alternative exploration and gradual uncertainty reduction. When designing a complex system, functional requirements decomposition is a common and effective approach to progress the design incrementally. However, the current literature on Set-Based Design lacks formal guidance in functional requirements decomposition. To bridge the gap, we propose a formal process to hierarchically decompose the functional requirements for Set-Based Design. A four-step formal process is proposed to systematically define, reason, and narrow the sets, and eventually decompose the functional requirement into the sub-requirements. Such a process can be used by the individual suppliers working in parallel at multiple levels of abstraction and guarantee that the resulting system will eventually satisfy the top-level functional requirements. An example of designing a cruise control system is applied to demonstrate the feasibility of the proposed process. © 2022, CC BY.

关键词： Large scale systems

Analyzing the trends and hotspots of biochar’s applications in agriculture,environment,and energy:a bibliometrics study for 2022 and 2023

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Biochar 2024年第1期6卷 1390-1407页

作者： Ping Wu Yingdong Fu Tony Vancov Hailong Wang Yujun Wang Wenfu Chen Hebei Key Laboratory of Soil Ecology Hebei Key Laboratory of Agricultural Water ResourcesCenter for Agricultural Resources ResearchInstitute of Genetics and Developmental BiologyChinese Academy of SciencesShijiazhuang 050022China. School of Life Sciences Institute of Life Sciences and Green DevelopmentHebei UniversityBaoding 071002HebeiChina. NSW Department of Primary Industries Elizabeth Macarthur Agricultural Insti-tuteMenangleNSW 2568Australia. School of Environmental and Chemical Engineering Foshan UniversityFoshan 528000GuangdongChina. Guangdong Provincial Key Laboratory of Integrated Agro-Environmental Pollution Control and Management Institute of Eco-Environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China. Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008JiangsuChina. University of Chinese Academy of Sciences Beijing 100049China. Biochar Engineering and Technology Research Center of Liaoning Province Rice Research InstituteAgronomy CollegeShenyang Agricultural UniversityShenyang 110866LiaoningChina.

Biochar,produced from the thermochemical conversion of biomass waste,has various applications owing to its broad utility and advantageous *** study employs a scientometric approach to comprehensively assess the advancements in biochar application from 2022 to *** 13,357 bibliographic records sourced from the Web of Science Core Collection with the search term“biochar”,the analysis focuses on authorship,national contributions,and keyword *** demonstrate a continual rise in annual publications since 2009,albeit with a moderated growth rate in *** leads in publication outputs,followed by USA and India,with Hailong Wang emerging as a prominent figure in biochar *** co-occurrence analyses identify key research themes such as biochar’s role in climate change mitigation,easing salinity and drought stress,immobilizing toxic metals,degrading organic pollutants,serving as additives in anaerobic digestion,and functioning as electrodes in microbial fuel *** these,biochar’s application for global climate change mitigation gains significant attention,while its utilization as electrodes in microbial fuel cells emerges as a promising research frontier,indicating the growing need for sustainable energy *** study also outlines critical research gaps and future priorities for enhancing biochar ***,it highlights the diverse applicability of biochar and offers valuable insight into research progression and forthcoming directions in biochar studies.

关键词： Bibliometric analysis Research hotspots Carbon neutrality Microbial fuel cells Sustainable application

Stochastic Model Predictive control for tracking of distributed linear systems with additive uncertainty

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arXiv 2021年

作者： Mark, Christoph Liu, Steven Institute of Control Systems Department of Electrical and Computer Engineering University of Kaiserslautern Erwin-Schrödinger-Str. 12 Kaiserslautern67663 Germany

In this paper, we propose a chance constrained stochastic model predictive control scheme for reference tracking of distributed linear time-invariant systems with additive stochastic uncertainty. The chance constraints are reformulated analytically based on mean-variance information, where we design suitable Probabilistic Reachable Sets for constraint tightening. Furthermore, the chance constraints are proven to be satisfied in closed-loop operation. The design of an invariant set for tracking complements the controller and ensures convergence to arbitrary admissible reference points, while a conditional initialization scheme provides the fundamental property of recursive feasibility. The paper closes with a numerical example, highlighting the convergence to changing output references and empirical constraint satisfaction. Copyright © 2021, The Authors. All rights reserved.

关键词： Linear time-invariant system

Optimal modified PID controller for automatic voltage regulation system

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AIP Conference Proceedings 2022年第1期2415卷

作者： Layla H. Abood Control and systems Engineering Department University of Technology Baghdad Iraq

This paper presents a smart optimization algorithm for tuning a modified structure of PID controller to regulate the terminal voltage of the automatic voltage regulator (AVR), it consists of four parameters proportional, integral and derivative plus second order derivative, all parameters are tuned using grey wolf optimization (GWO) algorithm for controlling the terminal voltage of AVR system. The response of the system using this controller is compared with other controllers using different new optimization methods in terms of transient analysis; also to test its performance; robustness analysis is performed on it in two types (model uncertainties and external disturbances). Simulation results reflect an efficient performance of PIDD2 controller also proved it is robust in facing disturbances and returning the system to its desired response.

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Rapid Stabilization of Timoshenko Beam by PDE Backstepping

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arXiv 2022年

作者： Chen, Guangwei Vazquez, Rafael Krstic, Miroslav The Institute of Cyber-Systems and Control Zhejiang University Hangzhou310027 China The Department of Aerospace Engineering Universidad de Sevilla Camino de los Descubrimiento s.n. Sevilla Spain The Department of Mechanical Aerospace Engineering University of California San DiegoCA92093-0411 United States

In this paper, we present a rapid boundary stabilization of a Timoshenko beam with anti-damping and anti-stiffness at the uncontrolled boundary, by using PDE backstepping. We introduce a transformation to map the Timoshenko beam states into a (2 + 2) × (2 + 2) hyperbolic PIDE-ODE system. Then backstepping is applied to obtain a control law guaranteeing closed-loop stability of the origin in the H1 sense. Arbitrarily rapid stabilization can be achieved by adjusting control parameters. Finally, a numerical simulation shows that the proposed controller can rapidly stabilize the Timoshenko beam. This result extends a previous work which considered a slender Timoshenko beam with Kelvin-Voigt damping, allowing destabilizing boundary conditions at the uncontrolled boundary and attaining an arbitrarily rapid convergence rate. © 2022, CC BY-NC-ND.

关键词： Backstepping

Data-driven distributionally robust MPC: An indirect feedback approach

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arXiv 2021年

—This paper presents a distributionally robust stochastic model predictive control (SMPC) approach for linear discrete-time systems subject to unbounded and correlated additive disturbances. We consider hard input constraints and state chance constraints, which are approximated as distributionally robust (DR) Conditional Value-at-Risk (CVaR) constraints over a Wasserstein ambiguity set. The computational complexity is reduced by resorting to a tube-based MPC scheme with indirect feedback, such that the error scenarios can be sampled offline. Recursive feasibility is guaranteed by softening the CVaR constraint. The approach is demonstrated on a four-room temperature control example. Copyright © 2021, The Authors. All rights reserved.

关键词： Feedback