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

共 229 条记录，以下是121-130 订阅

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An anti-islanding for multiple photovoltaic inverters using harmonic current injections

An anti-islanding for multiple photovoltaic inverters using ...

引用

2012 9th International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2012

作者： Patthamakunchai, Sutthipan Konghirun, Mongkol Lenwari, Wanchak Department of Electrical Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand Department of Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand

ISBN: (纸本)9781467320245

Islanding phenomenon is one of the major concerns in the distributed generator (DG) systems. Islanding occurs when one or more DGs supplied local loads without connecting to the grid utility. This unintentional condition must be detected with the minimum time possible to prevent the hazardous effects to a person worked in the system or equipment connected to the network. The two main methods of anti-islanding are passive and active methods. The passive methods are excellent in the speed of detection and power quality. However, the passive have relatively large non-detection zone (NDZ). On the other hands, the active methods have less relatively small NDZ and still provide a good speed of detection. This paper proposes an anti-islanding technique for multiple grid-connected inverters in photovoltaic (PV) system based on an active method. By injecting harmonic currents with the same or different harmonic orders and monitoring the change at the point of common coupling (PCC), the islanding condition can be diagnosed. Due to its excellent algorithm looking at specific frequencies, the Goertzel algorithm is employed in this paper to identify frequency components. Simulation results using PSIM software confirm the effectiveness to the technique in accordance with the requirements of the interconnection standards, IEEE Std. 1547 and IEEE Std. 929-2000. © 2012 IEEE.

关键词： IEEE Standards

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Improvement of warning lag time in forward collision warning systems based on multifunctional warnings

Improvement of warning lag time in forward collision warning...

引用

IEEE International Conference on Vehicular Electronics and Safety (ICVES)

作者： Peachanika Thammakaroon Poj Tangamchit Department of Control System and Instrumentation Engineering King Mongkut's University of Technology Bangkok Thailand

We present an improvement of forward collision warning (FCW) by adding more layers of warning functionality based on five stages of crash timeline. Generally, FCW operates at stage 3, the critical moment before crash. The added functionality is the location-based warning (LW) which warns the driver when driving toward a dangerous spot with high speed. LW operates at stage 2, an open condition to crash which comes from bad driving habit. We propose the use of warning lag time as a performance indicator, which is appropriate for real driving experiment. The warning lag time is defined as the time period between the issue of warning and the execution of brake by a normal driver. We performed real driving experiments with normal drivers and compare their brake actions with warnings from our system. The system with FCW alone achieved an average time lag of 1.47 sec., while the system with both FCW+LW can warn the driver faster with average time lag of 1.32 sec. The accuracy of both systems was about the same at 79%.

关键词： Vehicles Alarm systems Accidents Sensors Vehicle crash testing Safety Computer crashes

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Automatic traffic estimation system using mobile probe vehicles

Automatic traffic estimation system using mobile probe vehic...

引用

International Conference on Knowledge and Smart Technology (KST)

作者： Chirayut Panmungmee Manatchai Wongsarat Poj Tangamchit Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand

We propose a mobile camera system that can be installed on a moving. The system will automatically evaluate traffic levels in the area that the car has been driven through. Our system consists of two parts, the mobile probe and a stationary server. The mobile probe is operated by Android OS smartphone installed in a vehicle, which is used collect GPS data and image sequence of traffic scene from the front of the vehicle. The GPS and image data is periodically transferred to the stationary server via EDGE/3G cellular network. The GPS data is used to find an average space speed, which is used as an indicator to traffic status. The image data is used to recognize and filter out data from parking events, which do not represent traffic status. The level of traffic congestion is displayed in the format of three colors: red, yellow, and green.

关键词： Global Positioning system Image segmentation Probes Fires Image edge detection

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Two-degree-of-freedom ℋ∞ control design for harmonic current control of shunt active filters

Two-degree-of-freedom ℋ∞ control design for harmonic curre...

引用

International Conference on Harmonics and Quality of Power

作者： Sudchai Boonto Wanchak Lenwari Department of Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand

This paper presents a precise harmonic current control for shunt active filters (SAF) based on the robust control design. To ensure robust stability causing by system uncertainties and tracking performance, the robust control employing a two-degree-of-freedom ℋ ∞ control method is designed to accurately track harmonics generated by nonlinear loads in power system. The controller is synthesized by using mixed sensitivity loop shaping. The principle of the proposed control method and the design procedure are described. Robustness to parameter uncertainties can be achieved. The excellent control performance has been carried out by simulations.

关键词： Switches Current measurement

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Stochastic stability of genetic regulatory networks with multiple time-varying delays

Stochastic stability of genetic regulatory networks with mul...

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2012 International Conference onAdvanced Mechatronic systems, ICAMechS 2012

作者： Wang, Yan Wang, Hong Wang, Linkun School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China Control System Center University of Manchester Manchester M13 9PL United Kingdom Instrumentation Technology and Economy Institute Beijing 100055 China

ISBN: (纸本)9780955529382

This paper investigates the stochastic stability problem of genetic regulatory networks (GRNs) with multiple time-varying delays. Most of the results on the stability of GRNs with delays are based on a model in which the delays of the transcription and translation processes for each gene product take the same value. In this paper, we generalized the model to a differential equation with multiple time-varying delays. Sufficient conditions for the stochastic stability of the GRNs with stochastic noise are obtained. Finally, a simulation example is given to show the effectiveness of the proposed results. © 2012 Intl Jrnal Advanced Mech.

关键词： Differential equations

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A comparative study of rounded and strip electrostatic sensors for non-contact measurement of cable speed

A comparative study of rounded and strip electrostatic senso...

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IEEE instrumentation and Measurement Technology Conference

作者： Shaun J Rodrigues Yong Yan Instrumentation Control and Embedded System Research Group School of Engineering and Digital Arts University of Kent Canterbury Kent UK

This paper presents the recent progress in the design and implementation of a rounded electrostatic sensor for the speed measurement of non-flat static materials such as rounded cables in comparison to a strip type electrostatic sensor. Experimental tests were conducted on a motorized test rig for a speed ranging from 0.50m/s to 10m/s. The advantages and limitations of the two types of electrostatic sensor for non-contact speed measurement are discussed in detail. The results indicate that the rounded sensor outperforms the strip type sensor in terms of sensitivity, signal-to-noise ratio, repeatability, and accuracy.

关键词： Sensors Strips Electrostatics Velocity measurement Correlation Optical fiber cables Accuracy

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Stability analysis of a photovoltaic grid connected inverter model based on system identification

Stability analysis of a photovoltaic grid connected inverter...

引用

IEEE Region 10 International Conference TENCON

作者： Nopporn Patcharaprakiti Krissanapong Kirtikara Anawach Sanswang Sudchai Boonto Department of Electrical and Computer Rajamangala University of Technology Lanna Department of Electrical Engineering Department of Control System and Instrumentation Engineering King Mongkut's University of Technology Bangkok Thailand

ISBN: (纸本)9781467348232

This paper presents a system stability analysis of a grid-connected inverter from a linear system viewpoint. A Photovoltaic (PV) inverter model is derived using a system identification method, specifically the Hammerstein-Wiener model. The PV inverter is supplied by a controllable DC power supply and the inverter output is connected to a 220 V utility grid. The input and output characteristics on the inverter terminals are collected and the nonlinear model of the inverter is obtained. The inverter model is decomposed into three parts follow as nonlinear input, linear middle part and nonlinear output. Both nonlinear parts are deemed static where the dynamical behavior is described by the middle part. The stability of the inverter is analyzed based on a linearized model of the nonlinear system. Frequency response analysis is performed for insight on the system dynamical behavior.

关键词： Power system stability Stability criteria Inverters Mathematical model system identification Thermal stability

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An anti-islanding for multiple photovoltaic inverters using harmonic current injections

An anti-islanding for multiple photovoltaic inverters using ...

引用

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

作者： Sutthipan Patthamakunchai Mongkol Konghirun Wanchak Lenwari Department of Electrical Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand Department of Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand

关键词： Harmonic analysis Inverters Power harmonic filters Mathematical model IEEE standards

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An operational algorithm for satellite attitude determination from GPS carrier phase

An operational algorithm for satellite attitude determinatio...

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

作者： C. Tatiyaworanun S. Purivigraipong Department of Control and Instrumentation and Mechatronics Engineering Mahanakorn University of Technology Bangkok Thailand Centre for Electronic System Design and Signal Processing Department of Electronic Engineering Mahanakorn University of Technology Bangkok Thailand

This paper presents an operational approach for determining satellite attitude from carrier phase GPS (Global Positioning system) measurements. A conventional recursive least square (RLS) estimator was implemented without requiring spacecraft dynamics. The proposed approach can be applicable for general space missions, particularly for real-time operation onboard-spacecraft. The attitude angles and electrical path difference (line bias) between antenna chains caused an offset error in GPS observables, can be estimated. The implemented estimator was tested with a simulated data, and the flight data collected onboard a mini-satellite orbiting in low Earth orbit.

关键词： Global Positioning system Position measurement Space vehicles Vectors Satellites Extraterrestrial measurements Antenna measurements

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Mode transition of aqua-plasma generated by micro metal tip surrounded dielectric material in electrolyte

Mode transition of aqua-plasma generated by micro metal tip ...

引用

IEEE International Conference on Plasma Science (ICOPS)

作者： Sung-Young Yoon Gon-Ho Kim Sang-Heun Lee Young-Ki Hong Jung-Wha Hong Department of Energy System (Nuclear) Engineering Seoul National University Seoul South Korea Department of Rehabilitation Korea University Seoul South Korea Department of Control and Instrumentation Korea University Seoul South Korea

The aqua-plasma, non-thermal plasmas in liquids, can be discharged by forming the vapor coverage by Joule heating on the metal electrode. The electric field is decided by thickness of vapor coverage with applied voltage. It implies that the thickness of vapor coverage is the key parameter to the control the characteristics of aqua-plasma. The aquaplasma electrode consists with discharge tip, dielectric, and counter electrode. The tip covering vapor attaches on the dielectric with high surface tension coefficient. In this work, the effects of dielectric temperature on the mode transition of aqua-plasma are studied. The aqua-plasmas are discharged by applying ac driven voltage on the saline immersed discharge tip, size of 400 μm. The temperature of dielectric is controlled in range of 330 K - 500 K by varying the thickness from 90 μm to 780 μm. Ground electrode is placed under 30 mm of the tip. The V-I signals are monitored by using the voltage and current probes. The aqua-plasma shows three different modes with the thickness of dielectric; Townsend mode, glow-like mode, and spark mode. In case of 0.09 mm, dielectric temperature is relatively low, 330 K, due to thermal conduction from heated electrode to electrolyte. The spark discharge simultaneously occurs with the formation of vapor, 150 μm, with electric field of 5.2 MV/m. The vapor coverage is collapsed by high dose of plasma charge and re-built. In the 0.78 mm, dielectric temperature reaches to 500 K by low thermal conduction. Thickness of vapor coverage increases to 220 μm. The electric field is reduced to 3.4 MV/m and vapor coverage is maintained, Townsend mode streamer discharge takes place. The vapor coverage is oscillating since streamer heats up the vapor surface. In the intermediate dielectric thickness, 0.35 mm, glow-like discharge occurs. Also the rotation temperatures of aquaplasma produced ·OH* (T rot_·OH* ) are estimated by using the Boltzmann plot method on the OES. The two different T rot_·OH* are

关键词： Dielectrics Electrodes Discharges (electric) Plasma temperature Electric fields Legged locomotion

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