**Commenced**in January 2007

**Frequency:**Monthly

**Edition:**International

**Paper Count:**1956

# Search results for: space vector

##### 1956 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.

##### 1955 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.

##### 1954 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.

##### 1953 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.

##### 1952 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.

##### 1951 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

##### 1950 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

##### 1949 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.

##### 1948 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.

##### 1947 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.

##### 1946 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.

##### 1945 A Content Vector Model for Text Classification

**Authors:**
Eric Jiang

**Abstract:**

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

##### 1944 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.

##### 1943 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.

##### 1942 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.

##### 1941 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.

##### 1940 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.

##### 1939 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.

##### 1938 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.

##### 1937 Space Vector PWM Simulation for Three Phase DC/AC Inverter

**Authors:**
M. Kubeitari,
A. Alhusayn,
M. Alnahar

**Abstract:**

**Keywords:**
DC-AC Converter,
MatLab,
SPWM,
SVPWM,
Vref
- rotating frame.

##### 1936 Monotonicity of Dependence Concepts from Independent Random Vector into Dependent Random Vector

**Authors:**
Guangpu Chen

**Abstract:**

When the failure function is monotone, some monotonic reliability methods are used to gratefully simplify and facilitate the reliability computations. However, these methods often work in a transformed iso-probabilistic space. To this end, a monotonic simulator or transformation is needed in order that the transformed failure function is still monotone. This note proves at first that the output distribution of failure function is invariant under the transformation. And then it presents some conditions under which the transformed function is still monotone in the newly obtained space. These concern the copulas and the dependence concepts. In many engineering applications, the Gaussian copulas are often used to approximate the real word copulas while the available information on the random variables is limited to the set of marginal distributions and the covariances. So this note catches an importance on the conditional monotonicity of the often used transformation from an independent random vector into a dependent random vector with Gaussian copulas.

**Keywords:**
Monotonic,
Rosenblatt,
Nataf transformation,
dependence concepts,
completely positive matrices,
Gaussiancopulas

##### 1935 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.

##### 1934 DTC-SVM Scheme for Induction Motors Fedwith a Three-level Inverter

**Authors:**
Ehsan Hassankhan,
Davood A. Khaburi

**Abstract:**

**Keywords:**
Direct torque control,
space vector Pulsewidthmodulation(SVPWM),
neutral point clamped(NPC),
two-levelinverter.

##### 1933 A Robust LS-SVM Regression

**Authors:**
József Valyon,
Gábor Horváth

**Abstract:**

**Keywords:**
Support Vector Machines,
Least Squares SupportVector Machines,
Regression,
Sparse approximation.

##### 1932 Comparative Analysis of SVPWM and the Standard PWM Technique for Three Level Diode Clamped Inverter fed Induction Motor

**Authors:**
L. Lakhdari,
B. Bouchiba,
M. Bechar

**Abstract:**

The multi-level inverters present an important novelty in the field of energy control with high voltage and power. The major advantage of all multi-level inverters is the improvement and spectral quality of its generated output signals. In recent years, various pulse width modulation techniques have been developed. From these technics we have: Sinusoidal Pulse Width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVPWM). This work presents a detailed analysis of the comparative advantage of space vector pulse width modulation (SVPWM) and the standard SPWM technique for Three Level Diode Clamped Inverter fed Induction Motor. The comparison is based on the evaluation of harmonic distortion THD.

**Keywords:**
Induction motor,
multi-level inverters,
NPC inverter,
sinusoidal pulse width modulation,
space vector pulse width modulation.

##### 1931 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.

##### 1930 Multi Switched Split Vector Quantizer

**Authors:**
M. Satya Sai Ram,
P. Siddaiah,
M. Madhavi Latha

**Abstract:**

**Keywords:**
Unconstrained vector quantization,
Linear predictiveCoding,
Split vector quantization,
Multi stage vector quantization,
Switched Split vector quantization,
Line Spectral Frequencies.

##### 1929 Compensation–Based Current Decomposition

**Authors:**
Mihaela Popescu,
Alexandru Bitoleanu,
Mircea Dobriceanu

**Abstract:**

**Keywords:**
Active current,
Active filtering,
p–q theory,
Reactive
current.

##### 1928 Performances Assessment of Direct Torque Controlled IM Drives Using Fuzzy Logic Control and Space Vector Modulation Strategy

**Authors:**
L. Moussaoui,
L. Rahmani

**Abstract:**

This paper deals with the direct torque control (DTC) of the induction motor. This type of control allows decoupling control between the flux and the torque without the need for a transformation of coordinates. However, as with other hysteresis-based systems, the classical DTC scheme represents a high ripple, in both the electromagnetic torque and the stator flux and a distortion in the stator current. As well, it suffers from variable switching frequency. To solve these problems various modifications, in conventional DTC scheme, have been made during the last decade. Indeed the DTC based on space vector modulation (SVM) has proved to generate very low ripples in torque and flux with constant switching frequency. It also shows almost the same dynamic performances as the classical DTC system. On the other hand, fuzzy logic is considered as an interesting alternative approach for its advantages: Analysis close to the exigencies of user, ability of nonlinear systems control, best dynamic performances and inherent quality of robustness.

Therefore, two fuzzy direct torque control approaches, for the induction motor fed by SVM-voltage source inverter, are proposed in this paper. By using these two approaches of DTC, the advantages of fuzzy logic control, space vector modulation, and direct torque control method are combined. The performances of these DTC schemes are evaluated through digital simulation using Matlab/Simulink platform and fuzzy logic tools. Simulation results illustrate the effectiveness and the superiority of the proposed Fuzzy DTC-SVM schemes in comparison to the classical DTC.

**Keywords:**
Direct torque control,
Fuzzy logic control,
Induction motor,
Switching frequency,
Space vector modulation,
Torque and flux ripples.

##### 1927 Three Phase Fault Analysis of DC-Link Rectifier using new Power Differential Protection Concept

**Abstract:**

The concept of differential protection based on current quantities has been discussed in many paper and researches. For certificating and inverting of currents and voltages through converter systems, there is no conventional current differential relay, which can compare current quantities, because they are different in form and frequencies. An overview over a new concept of differential protection for converters based on instantaneous power quantities will be discussed in this paper. To drive the power quantities a mathematical background of the space vectors will be introduced. A simple DCLink is preceded in this paper and a power analysis description and simulation is derived using Matlab®/ SimulinkTM concerning a certain construction scheme of Power Differential Relay System. Finally a complete analysis of three phase fault in DC-Link Rectifier is discussed to ensure the ability of Power Differential Protection System to detect the fault in main and selectivity protection sections.

**Keywords:**
Space Vectors,
Power Differential Relay (PDR),
Short Circuit Power,
Diode Recovery Energy,
Detected Power Differential Signal (DPDS),
Power Space Vector (PSV),
Power Space Vector Protection Area (PSVPA).