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检索条件"机构=Control System and Instrumentation Engineering"

共 229 条记录，以下是101-110 订阅

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Robust repetitive control with feedforward scheme for stand-alone inverter

Robust repetitive control with feedforward scheme for stand-...

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International Conference on control, Automation and systems ( ICCAS)

作者： Wiboon Sintanavevong Sudchai Boonto Sumate Naetiladdanon Department of Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand Department of Electrical Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand

ISBN: (纸本)9781467390583

This paper proposes the combining of μ-synthesis robust repetitive control and feedforward control scheme to the design of constant sinusoidal voltage tracking for a stand-alone three-phase constant voltage inverter. The controller designed problem is defined in the form of two-degree-of-freedom feedback-feedforward controller. The D-K iterative algorithm is used to solve for both parts of the controller in one procedure to get the optimal controller. The proposed control scheme inherits the advantage of the robust repetitive control but does better in tracking performance. Simulation studies of the system were carried out using Matlab/SIMULINK to verify the effectiveness of the controller. The results show that the proposed control scheme outperforms the previous works under the scenario cases.

关键词： Feedforward neural networks Robustness Inverters Voltage control Uncertainty Closed loop systems

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Stock price manipulation detection using a computational neural network model

Stock price manipulation detection using a computational neu...

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International Workshop on Advanced Computational Intelligence (IWACI)

作者： Teema Leangarun Poj Tangamchit Suttipong Thajchayapong Dept. of Control System and Instrumentation Engineering King Mongkut's Univ. of Tech. Bangkok Thailand National Electronics and Computer Technology Center NSTDA Bangkok Thailand

We investigated the characteristics of stock price manipulation. Two manipulation models were studied: pump-and-dump and spoof trading. Pump-and-dump is a procedure to buy a stock and push its price up. Then, the manipulator dumps all of the stock he holds to make a profit. Spoof trading is a procedure to trick other investors that a stock should be bought or sold at the manipulated price. We constructed mathematical models that use level 2 data for both procedures, and used them to generate a training set consisting of buy/sell orders within on order book of 10 depths. Order cancellations, which are important indicators for price manipulation, are also visible in our level 2 data. In this paper, we consider a challenging scenario where we attempt to use less-detailed level 1 data to detect manipulations even though using level 2 data is more accurate. We implemented feedforward neural network models that have level 1 data, containing less-detailed information (no information about order cancellation), but is more accessible to investors as input. The neural network model achieved 88.28% for detecting pump-and-dump but it failed to model spoof trading effectively.

关键词： Manipulators Data models Hidden Markov models Neural networks Stock markets Predictive models Adaptation models

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Evaluation of a 500-N deadweight force standard machine at NIMT

Evaluation of a 500-N deadweight force standard machine at N...

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The Society of Instrument and control Engineers Annual Conference 2015

作者： Kittipong Chaemthet Ake Chaisawadi Department of Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi

A 500-N deadweight force standard machine(DWM) has been developed for calibrating force proving instrument of small force ranges at National Institute of Metrology, Thailand(NIMT). The DWM is able to generate calibration forces ranging from 2 N to 500 N with the relative expanded uncertainty of 5×10-5. This machine can be divided into six calibration ranges, which are 10 N, 20 N, 50 N, 100 N, 200 N and 500 N. To verify performance of the machine, this paper shows the evaluation of relative uncertainty in the range of 50 N to 500 N. The force transducer was calibrated by the machine according to ISO376:2011[1]. The calibration result of force transducers has shown repeatability and reproducibility. The relative deviation of the calibration errors were less than 5×10-5 at the 50 % to 100 % of the capacity of force transducer.

关键词： Deadweight force standard machine,DWM,uncertainty,force-proving instrument,ISO 376:2011

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Early-stage resource evaluation method for ECU integration of hybrid electric vehicles 28

Early-stage resource evaluation method for ECU integration o...

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28th International Electric Vehicle Exhibition, EVS 2015

作者： Kang, Eunhwan Park, I. Chung, J. Sunwoo, M. Lee, W. Youn, J. Yim, S. Won, D. Department of Automotive Engineering Graduate School Hanyang University Seoul Korea Republic of Hanyang University Seoul Korea Republic of Department of Automotive Engineering Hanyang University Seoul Korea Republic of Department of Control and Instrumentation Engineering Changwon National University Changwon-si Kyungsangnam-do Korea Republic of Hyundai-Kia R and D Center Eco-Vehicle Control System Development Team Hwaseong-si Gyeonggi-do Korea Republic of

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Three level single phase half bridge NPCVSI induction heating with combined phase shift PWM and PFM digital power control

Three level single phase half bridge NPCVSI induction heatin...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Sittichok Kaewoonruan Santi Nurach Wanchak Lenwari Department of Electrical Engineering King Mongkut's University of Technology Thonburi Thailand Department of Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi Thailand

This paper proposed a combined phase shift PWM and PFM controller of a high frequency three level single-phase half bridge neutral point clamp voltage source inverter (NPCVSI) induction heating application. In heating operation, output power and switching frequency of the inverter are controlled by digital controller to achieve maximum output power and maintain zero voltage switching (ZVS) condition. The microcontroller based digital controller, PI controller, is implemented in a 16-bit microcontroller.

关键词： Decision support systems Inverters Power generation Frequency control Switching frequency control systems Zero voltage switching

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Application of model order reduction techniques to space-time kinetics model of AHWR

Application of model order reduction techniques to space-tim...

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International Conference on Industrial instrumentation and control (ICIC)

作者： A. Rajasekhar A. P. Tiwari Madhu. N. Belur Reactor Control System Design Section Electronics & Instrumentation Group Bhabha Atomic Research Centre Mumbai Dept. of Electrical Engineering Indian Institute of Technology Mumbai

ISBN: (纸本)9781479971664

Advanced Heavy Water Reactor (AHWR), a large nuclear reactor in which heat removal is based on natural circulation of light water in coolant channels, is described by an 80 th order model for accurate representation of its core neutronics behavior. The model, besides being nonlinear, is stiff and control design and analysis studies for AHWR are accompanied by serious numerical ill-conditioning problems. Hence, there is a strong motivation for obtaining reduced order model for AHWR. In particular, the application of model order reduction based on Davison's and Marshall's dominant mode retention and Singular Perturbation techniques has been explored. Also, their performance, relative to each other, has been assessed by comparing the characteristics of the three model reduction techniques with the characteristics of the original higher order model. All of these three techniques are found to be very effective in obtaining a lower order simpler models for AHWR.

关键词： Eigenvalues and eigenfunctions Zirconium Distance measurement

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Online Parameter Identification Method for IPMSM Drive with MTPA

Online Parameter Identification Method for IPMSM Drive with ...

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International Conference on Electrical Machines and systems

作者： Peerasin Phowanna Sudchai Boonto Mongkol Konghirun Dept. of Electrical Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand Dept. of Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi Thailand

ISBN: (纸本)9781479988068

This paper presents the online identification method for interior permanent-magnet synchronous motor (IPMSM) drive system with the maximum torque per ampere (MTPA). The inductances of the motor are identified by recursive least square (RLS) method based on mathematical model, considering the flux saturation state. Using this technique, the improvement of the MTPA trajectory for IPMSM can be implemented along with the effect of magnetic flux. This final paper presents an idea and a procedure of the proposed algorithm. The simulation results are carried out and presented.

关键词： RLS MTPA IPMSM

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Simple on-line observation and compensation of dead-time effects

Simple on-line observation and compensation of dead-time eff...

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14th International Conference on Railway engineering Design and Optimization, COMPRAIL 2014

作者： Jung, S.M. Park, C.B. Kim, J.H. Lee, S.H. Kim, H.W. Advanced Traction and Noncontact Feeding System Research Team Korea Railroad Research Institute Korea Republic of Department of Control and Instrumentation Engineering Korea National University of Transportation Korea Republic of

ISBN: (纸本)9781845647667

Generally, there exist voltage differences between the voltage commands and the output voltages of the three-phase pulse-width modulated (PWM) voltage-source inverter (VSI), which are caused by the intended dead-time to prevent the armshort of a leg and the nonlinearities of switching devices. These voltage differences (or voltage distortion) affect the current distortion, torque pulsations, and degradation of control performances. To overcome these drawbacks, a simple and low-cost observation and compensation method of the voltage distortion is proposed. The proposed method is employing model reference adaptive system (MRAS) techniques and does not require any additional hardware circuits such as voltage sensors. The voltage distortions caused by the nonlinearities of the switching devices are estimated by a voltage distortion observer which is based on the electrical model of the PMSM. And the estimated voltage distortions are fed-forward to compensate the voltage commands. In comparison with the previous existing methods, the proposed method has a simple structure and good performances. Also, it can be implemented without any extra devices such as voltage sensors and the computing effort is very small. The execution of the algorithm can be easily embedded in the existing systems without major modification. To show the effectiveness of the proposed method, the experiments are carried out for the digitally controlled PMSM drive system. The experimental results verify the validity of the proposed method and show that the proposed method gives good performance and practical value. © 2014 WIT Press.

关键词： Electric inverters

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Grid Connected Inverter control by Two-Degree-of-Freedom Robust H_∞ Repetitive

Grid Connected Inverter Control by Two-Degree-of-Freedom Rob...

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International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology

作者： Worasak Sriart Sudchai Boonto Wanchak Lenwari Sumate Naetiladdanon Department of Control System and Instrumentation Engineering King Mongkut's University of Technology Department of Electrical Engineering King Mongkut's University of Technology Thonburi

ISBN: (纸本)9781479929948

This paper presents a robust control strategy for voltage controller of grid-connected inverter. The combining of feedforward control and H_∞ repetitive control is introduced to improve tracking performance and reduce periodic disturbance. The feedforward part of 2DOF controller extends gain and tracking bandwidth of the feedback controller when comparing to 1DOF controller. The proposed controller achieves the robust regulate voltage and tracking performance in dynamic responses. The controller is tested by simulation in MATLAB/SIMULINK. The results show the proposed controller obtains better performance under different scenarios (grid-connected mode and grid frequency variation).

关键词： visual tracking feedback controller controllers robust control strategy Voltage regulators FEEDFORWARD control Inventors Repetitive grids Grid VOLTAGE Gain

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Genetic Algorithm Based Speed controller Design of IPMSM Drive for EV

Genetic Algorithm Based Speed Controller Design of IPMSM Dri...

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International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology

作者： Pakorn Chottiyanont Mongkol Konghirun Wanchak Lenwari Department of Electrical Engineering King Mongkut's University of Technology Thonburi Department of Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi

ISBN: (纸本)9781479929948

In recent years, the development of the electrical vehicle (EV) in particular the performance enhancement of speed control has been widely attention. To ensure fast dynamic response and stable operation, the design of speed controller is critical and requires considerable effort. This paper proposes an automated design employed genetic algorithm (GA) to optimize PI speed controller of interior permanent magnet synchronous motor (IPMSM) used in the EV. The drive control system is designed on the basis of vector control scheme incorporated with the maximum torque per ampere (MTPA) control strategy to improve the drive performance. The optimization method provides an optimum solution in terms of both speed response and steady-state error. The simulation results verify the effectiveness of the proposed approach.

关键词： Genetic algorithm (GA) MTPA IPMSM Electric vehicle (EV)

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