**Commenced**in January 2007

**Frequency:**Monthly

**Edition:**International

**Paper Count:**8904

# Search results for: Vector Space Model.

##### 8904 Space Vector PWM and Model Predictive Control for Voltage Source Inverter Control

**Authors:**
Irtaza M. Syed,
Kaamran Raahemifar

**Abstract:**

In this paper, we present a comparative assessment of Space Vector Pulse Width Modulation (SVPWM) and Model Predictive Control (MPC) for two-level three phase (2L-3P) Voltage Source Inverter (VSI). VSI with associated system is subjected to both control techniques and the results are compared. Matlab/Simulink was used to model, simulate and validate the control schemes. Findings of this study show that MPC is superior to SVPWM in terms of total harmonic distortion (THD) and implementation.

**Keywords:**
Model Predictive Control,
Space Vector Pulse Width
Modulation,
Voltage Source Inverter.

##### 8903 A Content Vector Model for Text Classification

**Authors:**
Eric Jiang

**Abstract:**

**Keywords:**
Feature Selection,
Latent Semantic Indexing,
Text Classification,
Vector Space Model.

##### 8902 Knowledge Relationship Model among User in Virtual Community

**Authors:**
Fariba Haghbin,
Othman Bin Ibrahim,
Mohammad Reza Attarzadeh Niaki

**Abstract:**

**Keywords:**
Knowledge sharing network,
Virtual community,
knowledge relationship,
Vector Space Model.

##### 8901 Position Vector of a Partially Null Curve Derived from a Vector Differential Equation

**Authors:**
Süha Yılmaz,
Emin Özyılmaz,
Melih Turgut,
Şuur Nizamoğlu

**Abstract:**

In this paper, position vector of a partially null unit speed curve with respect to standard frame of Minkowski space-time is studied. First, it is proven that position vector of every partially null unit speed curve satisfies a vector differential equation of fourth order. In terms of solution of the differential equation, position vector of a partially null unit speed curve is expressed.

**Keywords:**
Frenet Equations,
Partially Null Curves,
Minkowski Space-time,
Vector Differential Equation.

##### 8900 Investigation of the Effects of Sampling Frequency on the THD of 3-Phase Inverters Using Space Vector Modulation

**Authors:**
Khattab Ibrahim Al Qaisi,
Nicholas Bowring

**Abstract:**

This paper presents the simulation results of the effects of sampling frequency on the total harmonic distortion (THD) of three-phase inverters using the space vector pulse width modulation (SVPWM) and space vector control (SVC) algorithms. The relationship between the variables was studied using curve fitting techniques, and it has been shown that, for 50 Hz inverters, there is an exponential relation between the sampling frequency and THD up to around 8500 Hz, beyond which the performance of the model becomes irregular, and there is an negative exponential relation between the sampling frequency and the marginal improvement to the THD. It has also been found that the performance of SVPWM is better than that of SVC with the same sampling frequency in most frequency range, including the range where the performance of the former is irregular.

**Keywords:**
SVPWM,
THD,
DC-AC Inverter,
Sampling
Frequency.

##### 8899 On the Determination of a Time-like Dual Curve in Dual Lorentzian Space

**Authors:**
Emin Özyılmaz

**Abstract:**

**Keywords:**
Classical Differential Geometry,
Dual Numbers,
DualFrenet Equations,
Time-like Dual Curve,
Position Vector,
DualLorentzian Space.

##### 8898 FPGA Based Implementation of Simplified Space Vector PWM Algorithm for Multilevel Inverter Fed Induction Motor Drives

**Authors:**
Tapan Trivedi,
Pramod Agarwal,
Rajendrasinh Jadeja,
Pragnesh Bhatt

**Abstract:**

**Keywords:**
Modular structure,
Multilevel inverter,
Space Vector
PWM,
Switching States.

##### 8897 A Formulation of the Latent Class Vector Model for Pairwise Data

**Authors:**
Tomoya Okubo,
Kuninori Nakamura,
Shin-ichi Mayekawa

**Abstract:**

In this research, a latent class vector model for pairwise data is formulated. As compared to the basic vector model, this model yields consistent estimates of the parameters since the number of parameters to be estimated does not increase with the number of subjects. The result of the analysis reveals that the model was stable and could classify each subject to the latent classes representing the typical scales used by these subjects.

**Keywords:**
finite mixture models,
latent class analysis,
Thrustone's paired comparison method,
vector model

##### 8896 Simplified Space Vector Based Decoupled Switching Strategy for Indirect Vector Controlled Open-End Winding Induction Motor Drive

**Authors:**
Syed Munvar Ali,
V. Vijaya Kumar Reddy,
M. Surya Kalavathi

**Abstract:**

_{dc/6. }To evaluate proposed algorithm MATLAB based simulation studies are carried on indirect vector controlled open end winding induction motor drive.

**Keywords:**
Inverter configuration,
decoupled SVPWM,
common mode voltage,
vector control.

##### 8895 Open-Loop Vector Control of Induction Motor with Space Vector Pulse Width Modulation Technique

**Authors:**
Karchung,
S. Ruangsinchaiwanich

**Abstract:**

This paper presents open-loop vector control method of induction motor with space vector pulse width modulation (SVPWM) technique. Normally, the closed loop speed control is preferred and is believed to be more accurate. However, it requires a position sensor to track the rotor position which is not desirable to use it for certain workspace applications. This paper exhibits the performance of three-phase induction motor with the simplest control algorithm without the use of a position sensor nor an estimation block to estimate rotor position for sensorless control. The motor stator currents are measured and are transformed to synchronously rotating (d-q-axis) frame by use of Clarke and Park transformation. The actual control happens in this frame where the measured currents are compared with the reference currents. The error signal is fed to a conventional PI controller, and the corrected d-q voltage is generated. The controller outputs are transformed back to three phase voltages and are fed to SVPWM block which generates PWM signal for the voltage source inverter. The open loop vector control model along with SVPWM algorithm is modeled in MATLAB/Simulink software and is experimented and validated in TMS320F28335 DSP board.

**Keywords:**
Electric drive,
induction motor,
open-loop vector control,
space vector pulse width modulation technique.

##### 8894 Optimal Space Vector Control for Permanent Magnet Synchronous Motor based on Nonrecursive Riccati Equation

**Authors:**
Marian Gaiceanu,
Emil Rosu

**Abstract:**

**Keywords:**
Matlab/Simulink,
optimal control,
permanent
magnet synchronous motor,
Riccati equation,
space vector PWM

##### 8893 Octonionic Reformulation of Vector Analysis

**Authors:**
Bhupendra C. S. Chauhan,
P. S. Bisht,
O. P. S. Negi

**Abstract:**

**Keywords:**
Octonions,
Vector Space and seven dimensions

##### 8892 Kalman Filter for Bilinear Systems with Application

**Authors:**
Abdullah E. Al-Mazrooei

**Abstract:**

In this paper, we present a new kind of the bilinear systems in the form of state space model. The evolution of this system depends on the product of state vector by its self. The well known Lotak Volterra and Lorenz models are special cases of this new model. We also present here a generalization of Kalman filter which is suitable to work with the new bilinear model. An application to real measurements is introduced to illustrate the efficiency of the proposed algorithm.

**Keywords:**
Bilinear systems,
state space model,
Kalman filter.

##### 8891 Recent Advances in Pulse Width Modulation Techniques and Multilevel Inverters

**Authors:**
Satish Kumar Peddapelli

**Abstract:**

This paper presents advances in pulse width modulation techniques which refers to a method of carrying information on train of pulses and the information be encoded in the width of pulses. Pulse Width Modulation is used to control the inverter output voltage. This is done by exercising the control within the inverter itself by adjusting the ON and OFF periods of inverter. By fixing the DC input voltage we get AC output voltage. In variable speed AC motors the AC output voltage from a constant DC voltage is obtained by using inverter. Recent developments in power electronics and semiconductor technology have lead improvements in power electronic systems. Hence, different circuit configurations namely multilevel inverters have became popular and considerable interest by researcher are given on them. A fast space-vector pulse width modulation (SVPWM) method for five-level inverter is also discussed. In this method, the space vector diagram of the five-level inverter is decomposed into six space vector diagrams of three-level inverters. In turn, each of these six space vector diagrams of three-level inverter is decomposed into six space vector diagrams of two-level inverters. After decomposition, all the remaining necessary procedures for the three-level SVPWM are done like conventional two-level inverter. The proposed method reduces the algorithm complexity and the execution time. It can be applied to the multilevel inverters above the five-level also. The experimental setup for three-level diode-clamped inverter is developed using TMS320LF2407 DSP controller and the experimental results are analyzed.

**Keywords:**
Five-level inverter,
Space vector pulse wide modulation,
diode clamped inverter.

##### 8890 Stochastic Subspace Modelling of Turbulence

**Authors:**
M. T. Sichani,
B. J. Pedersen,
S. R. K. Nielsen

**Abstract:**

**Keywords:**
Turbulence,
wind turbine,
complex coherence,
state space modelling,
ARMA modelling.

##### 8889 Some Characterizations of Isotropic Curves In the Euclidean Space

**Authors:**
Süha Yılmaz,
Melih Turgut

**Abstract:**

**Keywords:**
Classical Differential Geometry,
Euclidean space,
Minimal Curves,
Isotropic Curves,
Pseudo Helix.

##### 8888 Space-Vector PWM Inverter Feeding a Permanent-Magnet Synchronous Motor

**Authors:**
A. Maamoun,
Y. M. Alsayed,
A. Shaltout

**Abstract:**

The paper presents a space-vector pulse width modulation (SVPWM) inverter feeding a permanent-magnet synchronous motor (PMSM). The SVPWM inverter enables to feed the motor with a higher voltage with low harmonic distortions than the conventional sinusoidal PWM inverter. The control strategy of the inverter is the voltage / frequency control method, which is based on the space-vector modulation technique. The proposed PMSM drive system involving the field-oriented control scheme not only decouples the torque and flux which provides faster response but also makes the control task easy. The performance of the proposed drive is simulated. The advantages of the proposed drive are confirmed by the simulation results.

**Keywords:**
permanent-magnet synchronous motor,
space-vectorPWM inverter,
voltage/frequency control.

##### 8887 3D Model Retrieval based on Normal Vector Interpolation Method

**Authors:**
Ami Kim,
Oubong Gwun,
Juwhan Song

**Abstract:**

**Keywords:**
Interpolated Normal Vector,
Feature Descriptor,
3DModel Retrieval.

##### 8886 Space Vector Pulse Width Modulation Technique Based Design and Simulation of a Three-Phase Voltage Source Converter Systems

**Authors:**
Farhan Beg

**Abstract:**

A Space Vector based Pulse Width Modulation control technique for the three-phase PWM converter is proposed in this paper. The proposed control scheme is based on a synchronous reference frame model. High performance and efficiency is obtained with regards to the DC bus voltage and the power factor considerations of the PWM rectifier thus leading to low losses. MATLAB/SIMULINK are used as a platform for the simulations and a SIMULINK model is presented in the paper. The results show that the proposed model demonstrates better performance and properties compared to the traditional SPWM method and the method improves the dynamic performance of the closed loop drastically. For the Space Vector based Pulse Width Modulation, Sine signal is the reference waveform and triangle waveform is the carrier waveform. When the value sine signal is large than triangle signal, the pulse will start produce to high. And then when the triangular signals higher than sine signal, the pulse will come to low. SPWM output will changed by changing the value of the modulation index and frequency used in this system to produce more pulse width. The more pulse width produced, the output voltage will have lower harmonics contents and the resolution increase.

**Keywords:**
Power Factor,
SVPWM,
PWM rectifier,
SPWM.

##### 8885 A Hybrid GMM/SVM System for Text Independent Speaker Identification

**Authors:**
Rafik Djemili,
Mouldi Bedda,
Hocine Bourouba

**Abstract:**

**Keywords:**
Speaker identification,
Gaussian mixture model
(GMM),
support vector machine (SVM),
hybrid GMM/SVM.

##### 8884 Necessary and Sufficient Condition for the Quaternion Vector Measure

**Authors:**
Mei Li,
Fahui Zhai

**Abstract:**

**Keywords:**
Quaternion,
Quaternion measure,
Quaternion vector
measure,
Quaternion Banach space,
Quaternion linear functional.

##### 8883 Experimental Implementation of Model Predictive Control for Permanent Magnet Synchronous Motor

**Authors:**
Abdelsalam A. Ahmed

**Abstract:**

**Keywords:**
Permanent magnet synchronous motor,
mode
predictive control,
optimization of DC source utilization,
cascaded PI
control,
space vector pulse width modulation,
TMS320F2812 DSP.

##### 8882 Vector Control Using Series Iron Loss Model of Induction, Motors and Power Loss Minimization

**Authors:**
Kheldoun Aissa,
Khodja Djalal Eddine

**Abstract:**

**Keywords:**
Field Oriented Controller,
Induction Motor,
Loss ModelController,
Series Iron Loss.

##### 8881 Comparative Studies of Support Vector Regression between Reproducing Kernel and Gaussian Kernel

**Authors:**
Wei Zhang,
Su-Yan Tang,
Yi-Fan Zhu,
Wei-Ping Wang

**Abstract:**

**Keywords:**
admissible support vector kernel,
reproducing kernel,
reproducing kernel Hilbert space,
support vector regression.

##### 8880 Boosting Method for Automated Feature Space Discovery in Supervised Quantum Machine Learning Models

**Authors:**
Vladimir Rastunkov,
Jae-Eun Park,
Abhijit Mitra,
Brian Quanz,
Steve Wood,
Christopher Codella,
Heather Higgins,
Joseph Broz

**Abstract:**

Quantum Support Vector Machines (QSVM) have become an important tool in research and applications of quantum kernel methods. In this work we propose a boosting approach for building ensembles of QSVM models and assess performance improvement across multiple datasets. This approach is derived from the best ensemble building practices that worked well in traditional machine learning and thus should push the limits of quantum model performance even further. We find that in some cases, a single QSVM model with tuned hyperparameters is sufficient to simulate the data, while in others - an ensemble of QSVMs that are forced to do exploration of the feature space via proposed method is beneficial.

**Keywords:**
QSVM,
Quantum Support Vector Machines,
quantum
kernel,
boosting,
ensemble.

##### 8879 A Linear Relation for Voltage Unbalance Factor Evaluation in Three-Phase Electrical Power System Using Space Vector

**Authors:**
Dana M. Ragab,
Jasim A Ghaeb

**Abstract:**

The Voltage Unbalance Factor (VUF) index is recommended to evaluate system performance under unbalanced operation. However, its calculation requires complex algebra which limits its use in the field. Furthermore, one system cycle is required at least to detect unbalance using the VUF. Ideally unbalance mitigation must be performed within 10 ms for 50 Hz systems. In this work, a linear relation for VUF evaluation in three-phase electrical power system using space vector (SV) is derived. It is proposed to determine the voltage unbalance quickly and accurately and to overcome the constraints associated with the traditional methods of VUF evaluation. Aqaba-Qatrana-South Amman (AQSA) power system is considered to study the system performance under unbalanced conditions. The results show that both the complexity of calculations and the time required to evaluate VUF are reduced significantly.

**Keywords:**
Power quality,
space vector,
unbalance evaluation.

##### 8878 Vector Space of the Extended Base-triplets over the Galois Field of five DNA Bases Alphabet

**Authors:**
Robersy Sánchez,
Ricardo Grau

**Abstract:**

A plausible architecture of an ancient genetic code is derived from an extended base triplet vector space over the Galois field of the extended base alphabet {D, G, A, U, C}, where the letter D represent one or more hypothetical bases with unspecific pairing. We hypothesized that the high degeneration of a primeval genetic code with five bases and the gradual origin and improvements of a primitive DNA repair system could make possible the transition from the ancient to the modern genetic code. Our results suggest that the Watson-Crick base pairing and the non-specific base pairing of the hypothetical ancestral base D used to define the sum and product operations are enough features to determine the coding constraints of the primeval and the modern genetic code, as well as the transition from the former to the later. Geometrical and algebraic properties of this vector space reveal that the present codon assignment of the standard genetic code could be induced from a primeval codon assignment. Besides, the Fourier spectrum of the extended DNA genome sequences derived from the multiple sequence alignment suggests that the called period-3 property of the present coding DNA sequences could also exist in the ancient coding DNA sequences.

**Keywords:**
Genetic code vector space,
primeval genetic code,
power spectrum.

##### 8877 Fuzzy Logic Control for a Speed Control of Induction Motor using Space Vector Pulse Width Modulation

**Authors:**
Satean Tunyasrirut,
Tianchai Suksri,
Sompong Srilad

**Abstract:**

**Keywords:**
Fuzzy logic control,
space vector pulse width modulation,
induction motor.

##### 8876 Graph-Based Text Similarity Measurement by Exploiting Wikipedia as Background Knowledge

**Authors:**
Lu Zhang,
Chunping Li,
Jun Liu,
Hui Wang

**Abstract:**

**Keywords:**
Text classification,
Text clustering,
Text similarity,
Wikipedia

##### 8875 Contributions to Differential Geometry of Pseudo Null Curves in Semi-Euclidean Space

**Authors:**
Melih Turgut,
Süha Yılmaz

**Abstract:**

**Keywords:**
Semi-Euclidean Space,
Pseudo Null Curves,
Position Vectors.