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Choice of braking method of asynchronous electric motor for using in electric drives of conveyor equipment

Metallurgical and Mining Industry 2015年第8期7卷 6-12页

作者： Lobov, Vyacheslav Lobova, Karina Computer Science Automation and Control Systems Department State Higher Educational Institution 'Kryvyi Rih National University' Ukraine Automation and Control Systems Department State Higher Educational Institution 'Kryvyi Rih National University' Ukraine

Method, which allows estimating the intensity of braking of asynchronous electric motors with different power schemes and identifying recommendations for their use in automated electric drives of mechanisms of conveyor equipment, is suggested. Comparative analysis of different braking schemes is fulfilled. The results showed that while braking of reverse asynchronous motor it is necessary to use a controlled bridge rectifier scheme and for irreversible, the scheme that realizes vector-pulse way of dynamic braking. Scientific novelty is that the proposed research method allows to select a power scheme for braking electric drives of any industrial mechanism. Use of existing converters in stator of asynchronous motor, allows to realize electric drives braking without increasing their cost, so this has practical value.

关键词： Induction motors

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A new multiple-model adaptive actuator failure compensation scheme for a class of nonlinear MIMO systems 34

A new multiple-model adaptive actuator failure compensation ...

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34th Chinese control Conference, CCC 2015

作者： Yajie, Ma Bin, Jiang Gang, Tao College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing China Jiangsu Key Laboratory of Internet of Things and Control Technologies China Department of Electrical and Computer Engineering University of Virginia CharlottesvilleVA United States

ISBN: (纸本)9789881563897

This paper develops a new adaptive multiple-model control scheme for a class of nonlinear multiple-input multiple-output (MIMO) dynamic systems to compensate uncertain actuator failures using an error transformation. Such an adaptive control scheme, consisting of multiple estimators, controllers and a control switching mechanism with multiple cost functions, can ensure desired system stability and asymptotic tracking properties, despite the presence of failure uncertainties. Simulation results of an application to a spacecraft model verify the effectiveness of the proposed multiple-model based adaptive control scheme. © 2015 Technical Committee on control Theory, Chinese Association of automation.

关键词： Actuator failure adaptive compensation error transformation multiple-model control

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Model synthesis of nonlinear nonstationary dynamical systems in concentrating production using Volterra kernel transformation

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Metallurgical and Mining Industry 2015年第10期7卷 6-9页

作者： Morkun, Vladimir Morkun, Natalia Tron, Vitaliy Automation and Control Systems department Kryvyi Rih National University Ukraine Economic Cybernetics and Project Management Department Kryvyi Rih National University Ukraine Computer Science Automation and Control Systems department Kryvyi Rih National University Ukraine

The features of the application of mathematical modeling of nonlinear dynamic systems such as "input-output", which operate under the conditions of concentrating production, on the basis of finite sums of Vo... 详细信息

关键词： Dynamical systems

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Information systems in the technological processes automatic control development by technical condition criterion

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Metallurgical and Mining Industry 2015年第1期7卷 22-26页

作者： Yefimenko, Liudmyla Tykhanskyi, Mykhailo Computer Science Automation and Control Systems department State Higher Educational Institution Kryvyi Rih National University Ukraine

The substantiation of the use of information systems for the rational management of the belt conveyor for transport rocks by the criterion of the technical condition of its equipment is considered. © Metallurgica... 详细信息

关键词： Belt conveyors

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A New Multiple-Model Adaptive Actuator Failure Compensation Scheme for a Class of Nonlinear MIMO Systems

A New Multiple-Model Adaptive Actuator Failure Compensation ...

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第三十四届中国控制会议

作者： MA Yajie JIANG Bin TAO Gang College of Automation Engineering Nanjing University of Aeronautics and Astronautics Jiangsu Key Laboratory of Internet of Things and Control Technologies (Nanjing University of Aeronautics and Astronautics) Department of Electrical and Computer Engineering University of Virginia

ISBN: (纸本)9781467374439

This paper develops a new adaptive multiple-model control scheme for a class of nonlinear multiple-input multipleoutput(MIMO) dynamic systems to compensate uncertain actuator failures using an error transformation. Such an adaptive control scheme, consisting of multiple estimators, controllers and a control switching mechanism with multiple cost functions,can ensure desired system stability and asymptotic tracking properties, despite the presence of failure uncertainties. Simulation results of an application to a spacecraft model verify the effectiveness of the proposed multiple-model based adaptive control scheme.

关键词： Actuator failure,adaptive compensation,error transformation,multiple-model control

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A hybrid evolutionary probabilistic forecasting model applied for rainfall and wind power forecast

A hybrid evolutionary probabilistic forecasting model applie...

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IEEE Workshop on Evolving and Adaptive Intelligent Systems (EAIS)

作者： Guilherme G. Netto Alexandre C. Barbosa Mateus N. Coelho Arthur R. L. Miranda Vitor N. Coelho Marcone J. F. Souza Frederico G. Guimarães Agnaldo J. R. Reis Department of Control and Automation Engineering Universidade Federal de Ouro Preto Ouro Preto MG Brazil Graduate Program of Electrical Engineering Univesidade Federal de Minas Gerais Belo Horizonte MG Brazil Department of Computer Science Universidade Federal de Ouro Preto Ouro Preto MG Brazil Departament of Electrical Engineering Univesidade Federal de Minas Gerais Belo Horizonte MG Brazil

Several works in the literature so far have been focused on deterministic point forecasts, which, usually, indicates the conditional mean of future observations. An increasing need for generating the entire conditional distribution of future observations has been required for the new generation of soft sensors. This study aims the probabilistic forecasts, reporting the use of a hybrid fuzzy forecasting model applied in two different forecasting problems. Our adapted model is applied to predict the rain of the city of Vitoria, in the state of Espírito Santo, Brazil. Real data from a wind farm, provided by the Irish EirGrid institute, was used for analyzing the proposal over a real time series with high fluctuations. Due to the stochasticity of the the hybrid model, which is calibrated through the use of an evolutionary metaheuristic, we adapted it in order to generate future using quantile regression. Computational experiments indicated the ability of the model in finding useful probabilistic quantiles, which were flexible enough in order to limit the lower and upper bounds of the historical datasets. While the probabilistic quantiles suggested the probability of rain and its magnitude, they were also able to predict expected ranges of the amount of energy generated from the wind farm.

关键词： Forecasting Predictive models Wind forecasting Probabilistic logic Wind power generation Adaptation models Time series analysis

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A generalized piecewise quadratic lyapunov function approach to estimating the domain of attraction of a saturated system

A generalized piecewise quadratic lyapunov function approach...

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1st IFAC Conference on Modelling, Identification and control of Nonlinear Systems, MICNON 2015

作者： Li, Yuanlong Lin, Zongli Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing of Ministry of Education Shanghai200240 China Charles L. Brown Department of Electrical and Computer Engineering University of Virginia CharlottesvilleVA229044743 United States

This paper revisits the problem of estimating the domain of attraction of a saturated system with an algebraic loop. A piecewise quadratic Lyapunov function of an augmented state vector composing of the system state and the saturated input has been proposed for use in estimating the domain of attraction for a saturated system. Considering the relationship between the system states and the saturation function, we propose in this paper a generalized piecewise quadratic Lyapunov function, which results from adding a term that characterizes the regional sector condition of the saturated input to the piecewise quadratic Lypunov function. The matrix associated with the generalized piecewise quadratic Lyapunov function is not required to be positive definite, and thus a set of less conservative stability conditions are established, from which a larger estimate of the domain of attraction can be obtained. Simulation results indicate that the effectiveness and superiority of the proposed method.

关键词： Lyapunov functions

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Array P systems with parallel rewriting and tables of context-free rules

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Journal of Computational and Theoretical Nanoscience 2016年第6期13卷 3636-3642页

作者： Pan, Linqiang Song, Bosheng Isawasan, Pradeep Subramanian, K.G. School of Electric and Information Engineering Zhengzhou University of Light Industry Zhengzhou Henan450002 China Key Laboratory of Image Information Processing and Intelligent Control School of Automation Huazhong University of Science and Technology Wuhan Hubei430074 China 32 Jalan Anson Penang10400 Malaysia Department of Mathematics and Computer Science Faculty of Science Liverpool Hope University LiverpoolL16 9JD United Kingdom

The two areas of picture languages and membrane computing were linked by array-rewriting P system in which array objects and context-free array-rewriting rules are used in order to generate picture languages. While rewriting arrays in the array-rewriting P system is in a sequential manner, parallel array P system (PAP) involves rewriting of arrays in the regions in parallel in order to generate picture languages. A variant of PAP, known as tabled array P system (TPAP), uses sets of context-free array-rewriting rules, called tables of rules. Generative power of TPAP in comparison with PAP and certain other kinds of picture array generating mechanisms are investigated. Copyright © 2016 American Scientific Publishers. All rights reserved.

关键词： Context free languages

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Boundary feedback control of open canals with a Riemann invariants approach

Boundary feedback control of open canals with a Riemann inva...

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作者： Cen, Lihui Xi, Yugeng Li, Dewei Cen, Yigang Department of Control Engineering Central South University Changsha Hunan Province China Key Laboratory of System Control and Information Processing Ministry of Education Shanghai China Department of Automation Shanghai Jiaotong University Shanghai200240 China School of Computer and Information Technology Beijing Jiaotong University Beijing China

This paper proposes a boundary feedback control design for open canal networks using the linearization of boundary conditions. For open canal networks with any types of cross-sections, which can be modelled by the Saint-Venant equations, the characteristic form in terms of Riemann invariants has been established. Under this established characteristic form, the stabilizing boundary control law has been developed by linearizing the boundary conditions for both a single reach and the open-channel network composed by multi-reaches in a cascade. The design of the boundary feedback control laws for both a single canal and the cascaded networks is illustrated in a unified framework, which extends the results in the literature. © The Author(s) 2014.

关键词： Boundary conditions

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Reduced-order observer and controller design for a 1000MW ultra-supercritical unit 58

Reduced-order observer and controller design for a 1000MW ul...

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58th ISA Power Industry Division Symposium 2015: Setting the Standard for automation, POWID 2015

作者： Su, Zhi-Gang Qian, Chunjiang Wang, Qian Wang, Zhao Department of Energy Information and Automation School of Energy and Environment Southeast University Nanjing Jiangsu China Department of Electrical and Computer Engineering University of Texas at San Antonio San AntonioTX United States College of Information and Control Engineering China University of Petroleum Qingdao Shandong China

ISBN: (纸本)9781510814981

Recently due to the increase in electric power generated by wind and its feeding into the power network, even 1000MW ultra-supercritical units are required to operate in variable load conditions. This puts forward higher requirement in controlling of 1000MW ultra-supercritical units. Unfortunately, the complexity of dynamic models of 1000MW ultra-supercritical units makes it difficult to design controllers for those units using existing popular control tools. In this paper, we focus on designing a reduced-order observer as well as an exponentially stable controller in order to enhance the control performance of the ultra-supercritical unit, comparing with a constant controller. The reduced-order observer is first designed to estimate the amount of coal coming into the boiler for combustion. As a matter of fact, such amount of coal plays an important role in controlling the unit and it is really challenging to measure the amount of coal due to the limitation of sensors and the complex working conditions of boiler. It reveals that the reduced-order observer can rapidly estimate the true amount of coal. Furthermore, an exponentially stable controller is constructed in a straightforward way. This exponentially stable controller takes the estimated amount of coal from the reduced-order observer into account sufficiently. The computer simulations are conducted and the results suggest that the performance of the unit can be enhanced under the exponentially stable controller compared to the constant controller. © 2015 by International Society of automation - ISA. All rights reserved.

关键词： controllers

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