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16th Brazilian Power Electronics Conference, COBEP 2021

作者： Klein Faistel, Tiago Miguel Jank, Henrique Ribeiro, Gustavo Colpes Da Silva Martins, Mario Lucio Correa Lopes, Luiz Antonio Power Electronics and Control Research Group Federal University of Santa Maria Santa Maria Brazil Concordia University Department of Electrical and Computer Engineering Montreal Canada

ISBN: (纸本)9781665421294

This paper presents a power converter to interface an extra low voltage bus, ELV (48 V) and a low voltage bus, LV (380 V) in a residential dc-dc nanogrid of 1.2 kW. The proposed converter makes use of a composite structure where a DC transformer (DCX converter) handles the major amount of the processed power between the DC buses. DCX is design to operate at a fixed duty-cycle where the transformer turns-ratio is optimized to ensure the lowest conduction losses. To provide voltage regulation to ELV bus, a parallel voltage regulator (DCR) is employed. The power handled by the DCR is proportional to its input voltage across capacitor $C$ 1.1 Results from a 1.2 kW laboratory prototype confirm the feasibility of the proposed composite converter and reveals that it is a strong candidate for DC-DC applictations with a narrow volage regulation range. © 2021 IEEE.

关键词： Voltage regulators

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Sensor parametrisation and blending: a group theoretic approach

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IFAC-PapersOnLine 2015年第21期48卷 913-918页

作者： Szabó, Z. Balas, G. Gaspar, P. Bokor, J. Institute for Computer Science and Control Hungarian Academy of Sciences Budapest Kende u. 13-17 [Tel: +36-1-279-6171 Hungary Department of Aerospace Engineering and Mechanics University of Minnesota 107 Akerman Hall 110 Union St SE Minneapolis MN 55455 United States Institute for Computer Science and Control Hungarian Academy of Sciences MTA-BME Control Engineering Research Group Hungary

Sensors play an important role in the control loop. Often they are considered to be a part of the plant and the interaction between the plant and sensor is disregarded. In this paper we investigate stability properties of the control loop when this interface is considered explicitly from an input/output perspective. Making the assumption that the sensor is stable, we provide a Youla type characterisation of all the sensors that renders the loop stable for a fixed plant and controller. When none of the sensors can provide the necessary performance it is time for sensor blending or a sensor reconfiguration. The simplest form of sensor fusion, i.e., a linear combination of the sensors, does not preserve stability of the control loop, in general. In order to design efficient algorithms that operate on the set of controllers or a set of sensors that fulfil a given property, e.g., stability or a norm bound, it is important to have an operation that preserves that property, i.e., a suitable blending method. This paper places the sensor blending problem in a more general context: an operation on stable sensors is given under which feedback stability is preserved and under which sensors form a group, the sensor group. Under the action of this group operation changes in different sensitivities can be also expressed in explicit terms. These results can be applied in the analysis and synthesis of schemes with sensor reconfiguration. © 2015

关键词： Blending

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An adaptive neuro fuzzy controller for cement kiln

An adaptive neuro fuzzy controller for cement kiln

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2011 2nd International Conference on Instrumentation control and Automation, ICA 2011

作者： Sharabiany, Mehrad G. Fatehi, Alireza Araabi, Babak N. APAC Research Group Faculty of Electrical and Computer Engineering K.N. Toosi University of Technology Tehran Iran Control and Intelligent Processing Center of Excellence Faculty of Electrical and Computer Engineering University of Tehran Tehran Iran

ISBN: (纸本)9781457714603

In this paper a neural-fuzzy controller is used to control cement kiln. The fuzzy controller is in the TSK form. The controller is trained during the control action due to cope with the plant changes. The most important aspects of this controller are first using couple of smaller controllers instead of a complete centralized one and second using the same framework that kiln operators use.i.e. the input variables that the controller use are the same input variables that the kiln operators use to control the same controlled variables. Joint together, decentralized fuzzy controller instead of a centralized fuzzy one has fewer parameters which need less memory and processing power of the controller. The proposed controller is tested on a simulator model which made on the real data of Saveh cement factory. The simulation results show the efficiency of the proposed controller. © 2011 IEEE.

关键词： controllers

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Cascade IMC-PID control of Superheated Steam Temperature based on Closed-loop Identification in the Frequency Domain

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IFAC-PapersOnLine 2016年第18期49卷 91-97页

作者： Li, Xiao-Feng Ding, Dong-Jie Wang, Ya-Gang Huang, Zekun The Instrument and Power Plant Control Department Electric Power Research Institute of Guangdong Power Group Co. Guangzhou510080 China The School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Jungong Road Shanghai200093 China

This paper proposes an IMC-PID Cascade control of Superheated Steam Temperature based on closed-loop identification in the frequency domain. The process models of superheated steam temperature are firstly identified with set-point change tests in the inner and outer control loops. The process frequency responses are estimated, and then transform functions are obtained by least square method in both amplitude and phase. The IMC-PID controllers of the Steam Temperature Cascade control loop (SST) is designed by using the internal model control (IMC) and improved Skogestad-IMC (SIMC) method based on the obtained model. It is shown that this control strategy achieves better control performance and minimizes the effects of external and internal disturbances. © 2016

关键词： Closed loop control systems Cascade control systems control equipment Frequency response Least squares approximations Model predictive control Oceanography Steam Three term control systems Closed loop identification control performance H infinity controls IMC PID Internal model control Least square methods Steam temperature control Superheated steam temperature

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On an LQ control problem anomaly and a possible solution

On an LQ control problem anomaly and a possible solution

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IASTED International Conference on control and Applications, CA 2012

作者： Keviczky, László Bokor, József Computer and Automation Research Institute of the Hungarian Academy of Sciences Control Engineering Research Group of the HAS Department of Automation and Applied Informatics Kende u 13-17 H-1111 Budapest Hungary

ISBN: (纸本)9780889869226

The specific relationships between the classical pole-placement state feedback, the RICCATI equation based LQ paradigm and the KALMAN frequency domain approach are discussed. It is shown that arbitrary pole placement is not possible by standard LQ optimality. A possible solution of this anomaly is to use more general LQ criterion with specific weights on the state, input and crossterm.

关键词： State feedback

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IMC-PID controller Design for Power control Loop Based on Closed-loop Identification in the Frequency Domain

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IFAC-PapersOnLine 2016年第4期49卷 79-84页

作者： Li, Xiao-Feng Chen, Gang Wang, Ya-Gang Instrument and Power Plant Control Department Electric Power Research Institute Guangdong Power Group Co. Guangzhou510080 China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Jungong Road Shanghai200093 China

This paper proposes a closed-loop identification method for the design of a robust PID controller of the turbine control loop in the boiler-turbine coordinated control system. The process model is firstly identified. In the identification procedure, set-point change tests are adopted to calculate the model based on process inputs and outputs in control loops. The process frequency-response matrix is estimated, and then a transform function matrix is obtained by least square method. The robust PID controller of the turbine control loop is designed by using the internal model control (IMC) method based on the obtained model. It is shown that the IMC-PID controller maintains the robust performance and minimizes the effects of the external disturbance in power system or the internal disturbances in the power plant. © 2016, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： controllers Boiler control Closed loop control systems Design Electric control equipment Frequency response Least squares approximations Model predictive control Power control Proportional control systems Three term control systems Turbines Boiler turbine coordinated control systems Closed loop identification External disturbances H infinity controls Identification procedure IMC PID Internal model control Least square methods

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Optimization of the modeling loss contributing to the sensitivity function

Optimization of the modeling loss contributing to the sensit...

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IASTED International Conference on control and Applications, CA 2012

作者： Bányász, Csilla Keviczky, László Computer and Automation Research Institute of the Hungarian Academy of Sciences Control Engineering Research Group of the HAS Department of Automation and Applied Informatics Kende u 13-17 H-1111 Budapest Hungary

ISBN: (纸本)9780889869226

The control error in a generic two-degree of freedom (TDOF) control system can be decomposed into three major parts: design-, realizability- and modeling-loss. This new decomposition opens useful ways for practical optimization of TDOF systems and helps the construction of new algorithms for robust identification and control. The paper investigates the optimality of the third term.

关键词： Degrees of freedom (mechanics)

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Discrete event model structure identification using process mining

Discrete event model structure identification using process ...

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31st IASTED International Conference on Modelling, Identification, and control, MIC 2011

作者： Werner-Stark, Agnes Gerzson, Miklós Hangos, Katalin M. Department of Electrical Engineering and Information Systems University of Pannonia Egyetemstr. 10 Veszprém Hungary Process Control Research Group Computer and Automation Research Institute HAS Budapest Hungary

ISBN: (纸本)9780889868632

A novel structure identification procedure for discrete event systems described by Petri nets are proposed in this paper for model-based diagnostic purposes that utilize the notions and tools of process mining. The identification of the structurally different discrete event system models describing a system in its normal and/or faulty modes was used for model-based isolation of the considered faulty modes. From the available process mining techniques that allow for the automatic construction of process models in Petri net form based on event logs, the genetic algorithm-based structure identification procedure has been found to be most capable of identifying the characteristic structural elements of the faulty models. The proposed procedures are illustrated on a simple example of an operated parking gate automaton with two faulty modes.

关键词： Discrete event simulation

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Prioritization in automotive software testing: Systematic literature review 6

Prioritization in automotive software testing: Systematic li...

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6th International Workshop on Quantitative Approaches to Software Quality, QuASoQ 2018

作者： Dadwal, Ankush Washizaki, Hironori Fukazawa, Yoshiaki Iida, Takahiro Mizoguchi, Masashi Yoshimura, Kentaro Department of Computer Science and Engineering Waseda University Tokyo Japan Control Platform Research Department Center for Technology Innovation - Controls Hitachi Ltd. Research and Development Group United States

Automotive Software Testing is a vital part of the automotive systems development process. Not identifying the critical safety issues and failures of such systems can have serious or even fatal consequences. As the number of embedded systems and technologies increases, testing all components becomes more challenging. Although testing is expensive, it is important to reduce bugs in an early stage to maintain safety and to avoid recalls. Hence, the testing time should be reduced without impacting the reliability. Several studies and surveys have prioritized Automotive Software Testing to increase its effectiveness. The main goals of this study are to identify: (i) the publication trends of prioritization in Automotive Software Testing, (ii) which methods are used to prioritize Automotive Software Testing, (iii) the distribution of studies based on the quality evaluation, and (iv) how existing research on prioritization helps optimize Automotive Software Testing. Copyright © 2018 for this paper by its authors.

关键词： Software testing

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A complete operational architecture of alert correlation

A complete operational architecture of alert correlation

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2011 International Conference on Computational Aspects of Social Networks, CASoN'11

作者： Amiri, Fatemeh Gharaee, Hossein Enayati, Ali Reza Center of Excellence: Control and Intelligent Processing of Electrical and Computer Engineering University of Tehran Tehran Iran Network Security Group Iran Telecommunication Research Center Tehran Iran

ISBN: (纸本)9781457711312

To defend against various attacks, many security systems such as intrusion detection systems are deployed into hosts and networks to better protect digital assets. However, there are well-known problems related to the current intrusion detection systems. To better understand security threats from various sources and take appropriate response, it is necessary to perform alert correlation. This paper proposes a general alert correlation architecture, including four important components: log management, alert correlation, incident response and knowledge base system. The focus is to describe most important operations in alert correlation component. The proposed architecture includes anomaly-based analysis in alert correlation component. Different techniques for alert correlation are reviewed and compared. This study proposes that a hybrid model of multiple techniques leads to better performance of alert correlation engine. © 2011 IEEE.

关键词： Security systems

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