The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Atif Iqbal - One of the best experts on this subject based on the ideXlab platform.
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modelling and implementation of svpwm technique for a fifteen Phase Voltage source inverter for sinusoidal output waveform
International Conference on Industrial Technology, 2015Co-Authors: Shaikh Moinoddin, Atif Iqbal, Haitham Aburub, Rashid AlammariAbstract:In this paper space vector model of a fifteen-Phase Voltage source inverter (VSI) is presented. The space vector Pulse Width Modulation (SVPWM) of a fifteen-Phase Voltage source inverter (VSI) with the aim of producing sinusoidal output waveform, is illustrated. Generalized space vector theory is used to model the inverter and the SVPWM. As per the general inverter switching theory there are 215 = 32768 switching states are possible that yield 32766 active space Voltage vectors and two zero Voltage vectors at the origin. Out of the total 32766 active Voltage vectors, 210 Voltage vectors are utilized for the implementation of SVPWM. The sinusoidal Voltage is obtained by controlling the duty cycle the Voltage space vectors of d-q plane when Voltage space vectors of other six x-y planes are set to zero. Maximum modulation index is used to get balanced sinusoidal output. The theoretical results are verified by simulation and experimental results with R-L load.
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Modelling and implementation of SVPWM technique for a thirteen-Phase Voltage source inverter-sinusoidal output waveform
2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014, 2014Co-Authors: Moinoddin, Haitham Abu-rub, Atif IqbalAbstract:In this paper comprehensive space vector model of a thirteen-Phase Voltage source inverter (VSI) is reported. The paper also discusses the space vector Pulse Width Modulation (SVPWM) of a thirteen-Phase Voltage source inverter (VSI) with the aim of producing sinusoidal output waveform. Generalized space vector theory is used to achieve the SVPWM. As per the general inverter switching theory there are 213 = 8192 switching states possible that yield 8190 active space Voltage vectors and two zero Voltage vectors at the origin. Out of the total 8190 active Voltage vectors, 156 Voltage vectors are utilized for the implementation of SVPWM considering the constraint of sinusoidal output Voltage. The sinusoidal Voltage is obtained by controlling the duty cycle the Voltage space vectors of d-q plane when Voltage space vectors of other five x-y planes are set to zero. The theoretical results are verified by simulation and experimental results with R-L load.
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matlab simulink model of space vector pwm for three Phase Voltage source inverter
International Universities Power Engineering Conference, 2006Co-Authors: Atif Iqbal, Adoum Lamine, Imtiaz AshrafAbstract:Variable Voltage and frequency supply to AC drives is invariably obtained from a three-Phase Voltage source inverter (VSI). A number of pulse width modulation (PWM) schemes are used to obtain variable Voltage and frequency supply. The most widely used PWM schemes for three-Phase VSI are carrier-based sinusoidal PWM and space vector PWM (SVPWM). There is an increasing trend of using space vector PWM (SVPWM) because of their easier digital realisation and better dc bus utilisation. This paper focuses on step by step development of MATLAB/SIMULINK model of SVPWM. Firstly model of a three-Phase VSI is discussed based on space vector representation. Next simulation model of SVPWM is obtained using MATLAB/SIMULINK. Simulation results are also provided.
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space vector pwm techniques for sinusoidal output Voltage generation with a five Phase Voltage source inverter
Electric Power Components and Systems, 2006Co-Authors: Atif Iqbal, E LeviAbstract:Five-Phase variable-speed drives currently are considered for numerous applications, including electric and hybrid-electric vehicles, traction, and ship propulsion. If the machine is designed with a concentrated stator winding, the third stator current harmonic injection can be used to enhance the torque production and the machine needs to be supplied with the fundamental and the third harmonic of the Voltage. On the other hand, if the machine is with a sinusoidally distributed winding, the supply should consist of the fundamental harmonic only. Since five-Phase drives are invariably supplied from five-Phase Voltage source inverters (VSIs), adequate methods for VSI pulse width modulation (PWM) are required. This article analyzes different space vector PWM (SVPWM) schemes for a five-Phase VSI, which can be used for five-Phase motor drives with sinusoidal distribution of windings. A detailed model of a five-Phase VSI is presented first in terms of space vectors and the existing technique of utilizing only l...
E Levi - One of the best experts on this subject based on the ideXlab platform.
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analytical formulas for Phase Voltage rms squared and thd in pwm multiPhase systems
IEEE Transactions on Power Electronics, 2015Co-Authors: Obrad Dordevic, M Jones, E LeviAbstract:The analysis and assessment of the pulsewidth modulation (PWM) techniques is commonly based on the comparison of the total harmonic distortion (THD) results. THD is usually calculated by application of the Fourier transformation and by taking a limited number of harmonics into the consideration. In this paper, derivation of analytical formulas for the Phase Voltage THD is presented. The considered system is a symmetrical multiPhase starconnected load, supplied from a multilevel pulsewidth-modulated Voltage-source inverter (VSI, three-Phase case is also covered). The solution is based on the Parseval’s theorem, which links frequency spectrum and time domain through the average power (i.e., rootmean- square (rms) squared value) of the signal. The assumption throughout the derivations is that the ratio of the switching to fundamental frequency is high. Derivations are based on the integration of the power of the PWM signal in a single switching period over the fundamental period of the signal. Only ideal sinusoidal reference Voltages are analyzed, and no injection of any type is considered. Formulas for Phase Voltage THD for any number of Phases are derived for two- and three-level cases, for themost commonly used carrier-based methods. Comparison of the analytically obtained curves with simulation and experimental results shows a high level of agreement and validates the analysis and derivations.
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space vector pwm techniques for sinusoidal output Voltage generation with a five Phase Voltage source inverter
Electric Power Components and Systems, 2006Co-Authors: Atif Iqbal, E LeviAbstract:Five-Phase variable-speed drives currently are considered for numerous applications, including electric and hybrid-electric vehicles, traction, and ship propulsion. If the machine is designed with a concentrated stator winding, the third stator current harmonic injection can be used to enhance the torque production and the machine needs to be supplied with the fundamental and the third harmonic of the Voltage. On the other hand, if the machine is with a sinusoidally distributed winding, the supply should consist of the fundamental harmonic only. Since five-Phase drives are invariably supplied from five-Phase Voltage source inverters (VSIs), adequate methods for VSI pulse width modulation (PWM) are required. This article analyzes different space vector PWM (SVPWM) schemes for a five-Phase VSI, which can be used for five-Phase motor drives with sinusoidal distribution of windings. A detailed model of a five-Phase VSI is presented first in terms of space vectors and the existing technique of utilizing only l...
Olorunfemi Ojo - One of the best experts on this subject based on the ideXlab platform.
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the generalized discontinuous pwm scheme for three Phase Voltage source inverters
IEEE Transactions on Industrial Electronics, 2004Co-Authors: Olorunfemi OjoAbstract:This paper presents analytical techniques for the determination of the expressions for the modulation signals used in the carrier-based sinusoidal and generalized discontinuous pulse-width modulation schemes for two-level, three-Phase Voltage source inverters. The proposed modulation schemes are applicable to inverters generating balanced or unbalanced Phase Voltages. Some results presented in this paper analytically generalize the several expressions for the modulation signals already reported in the literature and new ones are set forth for generating unbalanced three-Phase Voltages. Confirmatory experimental and simulation results are provided to illustrate the analyses.
Shilin Pang - One of the best experts on this subject based on the ideXlab platform.
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a new Voltage compensation philosophy for dynamic Voltage restorer to mitigate Voltage sags using three Phase Voltage ellipse parameters
IEEE Transactions on Power Electronics, 2018Co-Authors: Lili Xie, Jiawei Han, Shilin PangAbstract:This paper introduces a series compensation philosophy to improve the Voltage property of loads using three-Phase Voltage ellipse parameters intended for optimal utilization of a dynamic Voltage restorer. The proposed approach relies on the instantaneous magnitude of Voltage signals and functions by inserting a virtual equivalent impedance in series with the distribution feeder during Voltage sags, compensating for the difference between faulty and nominal Voltages. In addition, the definite mathematical derivations using iterative processes are properly used as an identification mark of the resultant rotating vector tracing an ellipse. The ellipse parameters including major axis, minor axis, and inclination angle are utilized to develop the proposed algorithm and hence, a set of generalized VA loading formulations calculating an optimal sizing with the minimum possible rating are presented. The uniqueness of dual VSCs connected with common dc-side is an attempt to formalize the topological structure keeping a higher level of compensation accuracy. A novel design and the corresponding algorithm are proposed and all possible scenarios concerning sag depth and Phase jump are taken into consideration. MATLAB-based simulation results are discussed in detail to support the concept and the test is also performed to verify the effectiveness through real-time experimental laboratory.
Xiaoming Zha - One of the best experts on this subject based on the ideXlab platform.
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modeling method of sequence admittance for three Phase Voltage source converter under unbalanced grid condition
Journal of Modern Power Systems and Clean Energy, 2018Co-Authors: Yang Cen, Meng Huang, Xiaoming ZhaAbstract:The admittance is a strong tool for stability analysis and assessment of the three-Phase Voltage source converters (VSCs) especially in grid-connected mode. However, the sequence admittance is hard to calculate when the VSC is operating under unbalanced grid Voltage conditions. In this paper, a simple and direct modeling method is proposed for a three-Phase VSC taking the unbalanced grid Voltage as a new variable for the system. Then coupling in the three-Phase system can be calculated by applying the harmonic linearization method. The calculated admittance of three-Phase VSCs is verified by detailed circuit simulations.
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bifurcation and large signal stability analysis of three Phase Voltage source converter under grid Voltage dips
IEEE Transactions on Power Electronics, 2017Co-Authors: Meng Huang, Yu Peng, Chi K Tse, Yushuang Liu, Jianjun Sun, Xiaoming ZhaAbstract:Three-Phase Voltage source converters (VSCs) are commonly used as power flow interface in ac/dc hybrid power systems. The ac power grid suffers from unpredictable short-circuit faults and power flow fluctuations, causing undesirable grid Voltage dips. The Voltage dips may last for a short time or a long duration, and vary the working conditions of VSCs. Due to their nonlinear characteristics, VSCs may enter abnormal operating mode in response to Voltage dips. In this paper, the transient response of three-Phase VSCs under practical grid Voltage dips is studied and a catastrophic bifurcation phenomenon is identified in the system. The converter will exhibit an irreversible instability after the dips. The expanded magnitude of ac reactive current may cause catastrophic consequence for the system. A full-order eigenvalue analysis and a reduced-order mixed-potential-theory-based analysis are adopted to reveal the physical origin of the large-signal instability phenomenon. The key parameters of the system are identified and the boundaries of instability are located. The bifurcation phenomenon and a set of design-oriented stability boundaries in some chosen parameter space are verified by cycle-by-cycle simulations and experimental measurement on a practical grid-connected VSC prototype.
