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International Conference on Green Computing Communication and Electrical engineering (ICGCCEE)

作者： R. Madhumitha R. Vinothkumar Department of Control and Instrumentation Engineering Kongu Engineering College Erode Tamilnadu India Department of Power Systems Engineering M. Kumarasamy College of Engineering Karur Tamilnadu India

Due to fossil fuel depletion, power shortage has become a major problem in the world. This increases the importance of Distributed Energy Resources (DERs) among the consumers which in turn led to the expansion of microgrid. Microgrid operates in grid-connected mode as well as in islanded mode. Microgrid is connected to main grid in grid connected mode. In islanded mode, there is no such connection and hence the microgrid operates independently. Microgrid may move to islanded mode intentionally or unintentionally. Power in the grid is not constant which in turn affected the loads connected to the grid. Due to the Sun light variation the voltage output from the grid may not be constant. In three phase microgrid, fault in one phase causes loss of voltage stability in other two phases. PID control has been used for microgrid voltage control but it does not work properly during fault conditions. So, an adaptive PI controller has been proposed to provide voltage regulation in microgrid which provides better performance under all the circumstances. The performance of the system employing adaptive PI controller is validated using the results obtained from the MATLAB Simulink.

关键词： Microgrids Voltage control Inverters Reactive power Oscillators Power generation Capacitors

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Ethanol Content Estimation in a Flex-Fuel Motercycle using Engine Speed Measurements

Ethanol Content Estimation in a Flex-Fuel Motercycle using E...

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

作者： R. Jensrakoo S. Wongsa D. Koolpiruck Y. Laoonual Department of Control Systems and Instrumentation Engineering King Mongkut's University of Technology Thonburi Department of Mechanical Engineering King Mongkut's University of Technology Thonburi

ISBN: (纸本)9781479929948

The performance of engine management system of flexible fuel vehicles relies on the estimation of the ethanol content in the fuel blend. Many previously proposed estimation approaches involve additional redundant sensors which increase production costs. In this research work, we proposed a simple ethanol estimation technique which uses only the measurement of engine-speed at a fixed starting condition. The engine speed response was modelled as a first-order system. It was found that the steady-state characteristics of the model were able to capture the effect of changing fuel composition. By applying a nearest-mean classifier-based scheme, we could select the best feature from the model. Five different blends, including E10, E20, E50, E85, and E100, were used to formulate the model and experimentally validated the proposed technique.

关键词： Spark ignition engines Flex-fuel vehicles Ethanol content estimation Engine speed

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Soft computing techniques based optimal tuning of virtual feedback PID controller for chemical tank reactor

Soft computing techniques based optimal tuning of virtual fe...

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Congress on Evolutionary Computation

作者： M Geetha P Manikandan Jovitha Jerome PSG College of Technology Coimbatore Tamil Nadu IN Department of Instrumentation and Control Systems Engineering PSG College of Technology Coimbatore India

CSTR plays a vital role in almost all the chemical reactions and is a highly nonlinear system exhibiting stable as well as unstable steady states. The variables which characterize the quality of the final product in CSTR are often difficult to measure in real-time and cannot be directly measured using the feedback configuration [1]. So, a virtual feedback control is implemented to control the state variables using Extended Kalman Filter (EKF) in the feedback path. Since it is hard to determine the optimal or near optimal PID parameters using classical tuning techniques like Ziegler Nichols method, a highly skilled optimization algorithm like Particle Swarm Optimization (PSO) and Ant Colony Optimization (ACO) are used. This work is based on the optimal tuning of virtual feedback PID control for a CSTR system using soft computing algorithm for minimum Integral Square Error (ISE) condition.

关键词： Tuning Chemical reactors Inductors Mathematical model Optimization Genetic algorithms Sociology

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A study of data reduction for P300 speller system

A study of data reduction for P300 speller system

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

作者： Kittisak Rittikun Panuthat Boonpramuk Prapong Prechaprapranwong Department of Control Systems and Instrumentation Engineering King Mongkut's University Thonburi Learning Institute King Mongkut's University Thonburi

ISBN: (纸本)9781479929948

The aim of this research is to reduce data for a P300 spelling system by using downsampling algorithm to reduce the sampling rate of the system. The comparison between this method and standard algorithms such as Discrete Wavelet Transforms (DWT) and Principal Components Analysis (PCA) is also discussed in this paper. While downsampling algorithm is used to reduce sampled data, Ensemble of Support Vector Machine (ESVM) is used to model and to classify the reduced data in order to predict characters. The experimental results show that the accuracy of downsampling algorithm, no-data-reduction algorithm, DWT and PCA are 97.5%, 93.5%, 96.0%, and 79.5% respectively.

关键词： P300 speller Discrete wavelet transforms Support vector machine Ensemble of classifiers Amyotrophic lateral sclerosis

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A Robust pole assignment algorithm using linear quadratic regulator applied to an inverted pendulum

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Mediterranean Journal of Measurement and control 2013年第4期9卷 127-137页

作者： Kumar, Vinodh Jerome, Jovitha Department of Instrumentation and Control Systems Engineering PSG College of Technology Coimbatore 641004 India

This paper describes the method for stabilizing and trajectory tracking of Self Erecting Single Inverted Pendulum (SESIP) using Linear Quadratic Regulator (LQR). An important advantage of LQR is that it gives a robust system by guaranteeing stability margins, and this property is used to develop an algorithm for locating the robust poles according to the controller specifications. A robust weight selection algorithm is proposed in this paper to determine the appropriate weighting matrices Q and R of LQR to assign the eigen values at the desired locations. When the desired poles lie outside the allowable LQR region, the achievable poles inside the region that are closest to the desired poles are determined by minimizing the eigen value cost difference function. The solution requires a gradient search technique to minimize the difference of weighted eigen value cost function. The steady state and dynamic characteristics of the proposed controller are investigated by conducting experiments on benchmark linear inverted pendulum system. Experimental results prove that the proposed LQR controller can guarantee the inverted pendulum a faster and smoother stabilizing process with less oscillation and better robustness than a conventional PID controller. Copyright © 2013 SoftMotor Ltd. ISSN: 1743-9310.

关键词： controllers

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Comparison of four state observer design algorithms for MIMO system

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Archives of control Sciences 2013年第2期23卷 243-256页

作者： Kumar, Vinodh E. Jerome, Jovitha Ayyappan, S. Department of Instrumentation and Control Systems Engineering PSG College of Technology Coimbatore Tamilnadu 641004 India

A state observer is a system that models a real system in order to provide an estimate of the internal state of the system. The design techniques and comparison of four different types of state observers are presented in this paper. The considered observers include Luenberger observer, Kalman observer, unknown input observer and sliding mode observer. The application of these observers to a Multiple Input Multiple Output (MIMO) DC servo motor model and the performance of observers is assessed. In order to evaluate the effectiveness of these schemes, the simulated results on the position of DC servo motor in terms of residuals including white noise disturbance and additive faults are compared.

关键词： DC motors

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A robot design for trans-oral surgery

A robot design for trans-oral surgery

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International Conference on Ubiquitous Robots and Ambient Intelligence (URAI)

作者： Jong-Tae Seo Jaehong Woo Long Kang Wheekuk Kim Byung-Ju Yi Department of Mechatronics Engineering Hanyang University Ansan Korea Department of Intelligent Robot Engineering Hanyang University Ansan Korea Department of Electronic Systems Engineering Hanyang University Ansan Korea Department of Control and Instrumentation Engineering Korea University Chochiwon Korea Department of Mechanical Engineering Hanyang University Ansan Korea

ISBN: (纸本)9781479953349

The objective of this paper is to describe a new design of a trans-oral surgical robot. The trans-oral robotic surgery system consists of a master device and a slave device. Specifically, the concept of stackable mechanism is applied to design both master and slave devices. Using the stackable architecture, counter-balancing can be achieved over the whole workspace and compact design can be made by locating all motors at the base of the robot. Through simulation, the performance of the trans-oral surgical robot is verified.

关键词： Surgery Educational institutions Electronic mail Medical robotics Simulation

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Comparative performance analysis of extended Kalman filter and neural observer for state estimation of continuous stirred tank reactor

Comparative performance analysis of extended Kalman filter a...

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2013 4th International Conference on Computing, Communications and Networking Technologies, ICCCNT 2013

作者： Geetha, M. Jerome, Jovitha Kumar, P Arun Anadhan, Karthik Department of Instrumentation and Control Systems Engineering PSG College of Technology Coimbatore India

ISBN: (纸本)9781479939268

In this paper, a systematic approach to design a non-linear observer to estimate the states of a non-linear system is proposed. The neural network based state filtering algorithm proposed by A.G. Parlos et al. has been used to estimate the state variables, concentration and temperature in the Continuous Stirred Tank Reactor (CSTR) process. CSTR is a typical chemical reactor system with complex nonlinear dynamics characteristics. The variables which characterize the quality of the final product in CSTR are often difficult to measure in realtime and cannot be directly measured using the feedback configuration. In this work, the authors compare the performance of an Extended Kalman Filter (EKF) with respect to Neural Network (NN) based state filter for CSTR that rely solely on concentration estimation of CSTR via measured reactor temperature. The performance of these two filters is analyzed in simulation with Gaussian noise source under various operating conditions and model uncertainties. © 2013 IEEE.

关键词： Extended Kalman filters

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Robust Object Tracking Via Class Aware Partial Least Squares-gabor Wavelet Subspace

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Procedia engineering 2013年 64卷 159-168页

作者： K. Selvakumar Jovitha Jerome Research scholar Department of Instrumentation and Control Systems Engineering PSG College of Technology Coimbatore- 641004 Professor Department of Instrumentation and Control Systems Engineering PSG College of Technology Coimbatore- 641004

Effective tracking is still a big challenge due to lack of robust descriptors which captures discriminative features in non-controlled environment. We propose a novel descriptor based on Gabor wavelet and Partial Least Squares (PLS) discriminant analysis. Multi scale and multi orientation Gabor wavelets can extract selective local frequencies effectively in spatial and frequency domain. Due to the large dimension of feature vectors, dimensionality reduction is done using class aware PLS analysis. Unlike unsupervised Principal Component Analysis (PCA), PLS based subspace model learns target effectively by explicitly knowing the class labels of target and background region feature vectors. Tracking is done using particle filter and similarity between target and candidates is measured using low dimensional subspace model. To combat the target changes during tracking, novel static and dynamic target as well as background update strategy is used. Experimental results of various dataset demonstrate that the proposed tracker improves robustness and accuracy against representative trackers.

关键词： Object tracking Gabor wavelet Partial Least Squares Discriminant Analysis Particle filter

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Applications of Sliding Observers for FDI in Aerospace systems

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12th IEEE International Workshop on Variable Structure System, VSS 2012

作者： Edwards, Christopher Alwi, Halim Menon, Prathyush P. Center for Systems Dynamics and Control CEMPS University of Exeter United Kingdom Control and Instrumentation Group Department of Engineering University of Leicester United Kingdom Center for Systems Dynamics and Control Mathematical Research Institute University of Exeter United Kingdom

ISBN: (纸本)9783642369858

This chapter presents applications of second order sliding mode observer schemes to three different aerospace problems. Two relate to ADDSAFE aircraft fault detection benchmark problems. Firstly, the detection and isolation problem associated with an actuator jam/runaway is considered and secondly an actuator oscillatory failure case is tackled. For the actuator jam/runaway scenario the actuator deflection becomes decoupled from the demand issued from the flight control computer and either remains fixed at some uncommanded point or 'runs away' to an extreme value. For the OFC problem, the reconstruction scheme requires an estimate of rod speed provided by a second order sliding mode observer. Ideally low gains in the observer are required because of the noisy environment associated with the physical system. An adaption scheme is therefore required to retain sliding in the presence of severe faults. A problem associated with fault detection in a formation flying scenario, associated with satellites is also discussed. This application to a relative degree two problem would be difficult to solve using linear observer methods. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Actuators

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