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Emil Levi - One of the best experts on this subject based on the ideXlab platform.
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Magnetic saturation in rotor‐Flux‐oriented induction motor drives: operating regimes, consequences and open‐loop compensation
European Transactions on Electrical Power, 2007Co-Authors: Emil LeviAbstract:Parameter variation effects infield-oriented induction machines can cause significant performance deterioration. Magnetic saturation of the Main Flux path is one of the sources of parameter variations, caused by non-linear nature of the magnetizing curve. The paper at first discusses operating regimes of a rotor-Flux-oriented machine which lead to operation with variable Main Flux in the machine. These are shown to be operation with variable stator d-axis current command during forced excitation and in field-weakening region, and operation with variable q-axis current command during rapid speed changes when cross-saturation effect causes variable Main Flux operation. Actual effects of variable saturation level on performance of the drive are assessed by simulation. Modified rotor Flux estimation schemes are then derived, which enable instantaneous open-loop adaptation to actual saturation degree in the machine. The proposed adaptive rotor-Flux estimators are verified by simulation and some experimental results are included as well. As the saturated induction machine representation is based on the current state-space model, while the modified rotor-Flux estimator relies on the Flux state-space model, the performed simulation study shows that current state-space model and Flux state-space model, although considerably different in their appearance, account for the Main Flux saturation in basically the same way.
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A Novel Induction Machine Model and its Application in the Development of an Advanced Vector Control Scheme
International Journal of Electrical Engineering Education, 2000Co-Authors: M. Sokola, Emil LeviAbstract:A novel induction motor model, that fully accounts for both the fundamental iron loss and Main Flux saturation, is derived. The model is then applied to the design of a modified rotor Flux oriented control scheme. A rotor Flux estimator and a rotor resistance identifier are both developed using the novel model, so that simultaneous compensation of Main Flux saturation, iron loss and rotor resistance variation is achieved.
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Modelling of magnetic saturation in smooth air-gap synchronous machines
IEEE Transactions on Energy Conversion, 1997Co-Authors: Emil LeviAbstract:Main Flux saturation in d-q axis representation of synchronous machines is at present modelled by selecting either all the winding currents or all the winding Flux linkages as state-space variables. However, these two available models are just a tiny portion of the complete set of models that can be obtained by selecting other combinations of state-space variables. This paper presents a general procedure for Main Flux saturation modelling in smooth air-gap synchronous machines, that is applicable for most selections of state-space variables. The method relies on the concept of 'generalised Flux' and 'generalised inductance', that has been successfully applied in modelling of saturated single-cage and double-cage induction machines. The concept is extended to saturation modelling in smooth air-gap synchronous machines. A number of models, that result from the application of the method for different selections of state-space variables, are presented in detail.
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Main Flux saturation modelling in double-cage and deep-bar induction machines
IEEE Transactions on Energy Conversion, 1996Co-Authors: Emil LeviAbstract:The available models of saturated double-cage and deep-bar induction machines are the current state-space model and the Flux state-space model, where state-space variables are selected either as stator current and currents of both rotor cages, or stator Flux linkage and Flux linkages of both rotor cages. This paper presents a number of models of saturated double-cage (deep-bar) induction machines where alternative sets of state-spate variables are selected. The method of Main Flux saturation modelling relies on recently introduced concept of 'generalised Flux space vector', which has originally been developed for modelling of saturated single-cage induction machines. The procedure and the novel models are verified by experimental study and simulation of self-excitation process in a double-cage induction generator.
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A unified approach to Main Flux saturation modelling in D-Q axis models of induction machines
IEEE Transactions on Energy Conversion, 1995Co-Authors: Emil LeviAbstract:Main Flux saturation is most frequently modelled by selecting either stator and rotor d-q axis currents or stator and rotor d-q axis Flux linkages as state-space variables. This paper attempts to unify Main Flux saturation modelling in d-q axis models of induction machines by presenting a general method of saturation modelling. Selection of state-space variables in the saturated machine model is arbitrary and appropriate models in terms of different state-space variables result by application of the method. A couple of models, obtainable with different selection of state-space variables, are presented. The cross-saturation effect is explicitly present in all the models, except for the one with stator and rotor Flux linkage d-q axis components as state-space variables. The models are verified by simulation and experimental investigation of induction generator self-excitation. >
Juri Jatskevich - One of the best experts on this subject based on the ideXlab platform.
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voltage behind reactance model of six phase synchronous machines considering stator mutual leakage inductance and Main Flux saturation
Electric Power Systems Research, 2016Co-Authors: Navid Amiri, Mehrdad Chapariha, Juri Jatskevich, Seyyedmilad Ebrahimi, H W DommelAbstract:Abstract Six-phase synchronous machines have been used in special-purpose applications such naval and aircraft power systems, and are now being considered in renewable energy systems due to their advantages such as lower power per phase, less mechanical stress, and higher reliability compared to three-phase machines. This paper is focused on techniques for modeling six-phase synchronous machines in transient simulation programs. Firstly, the qd 0 model is presented, and a method for incorporating the Main Flux saturation is proposed. However, since in simulation programs, the qd 0 model is interfaced as a current source, it creates interfacing challenges with power electronics devices and inductive networks. To alleviate the interfacing challenge, the already available coupled-circuit phase doMain (CCPD) model is also considered. This paper presents a new voltage-behind-reactance (VBR) formulation that includes the stator mutual inductances and Main Flux saturation, while achieving direct interface with external circuit. The presented VBR model is verified in a single-phase to ground fault scenario while connected to an arbitrary six-phase network. The computer studies demonstrate the numerical advantages of the new model including simulation time and accuracy over the CCPD and the conventional qd 0 models.
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Constant-parameter synchronous machine model including Main Flux saturation
IET Electric Power Applications, 2016Co-Authors: Francis Therrien, Mehrdad Chapariha, Juri JatskevichAbstract:This paper presents a new general-purpose state-space synchronous machine model based on the voltage-behind-reactance (VBR) formulation which accounts for Main Flux saturation. The proposed model has a numerically efficient constant-parameter decoupled RL branch interfacing circuit comprised of the stator and field windings. Consequently, the new model can be interfaced directly with arbitrary power networks and exciter circuits. The presented studies, executed using the Simulink toolbox PLECS, demonstrate the superior combination of numerical accuracy and efficiency of the new VBR model compared with existing state-of-the-art models. As a result, the proposed model would be a desirable addition to the built-in component libraries of many industry-grade state-variable-based transient simulators.
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Constant-Parameter Interfacing of Induction Machine Models Considering Main Flux Saturation in EMTP-Type Programs
IEEE Transactions on Energy Conversion, 2016Co-Authors: Francis Therrien, Mehrdad Chapariha, Liwei Wang, Juri JatskevichAbstract:The state-of-the-art magnetically linear voltage-behind-reactance (VBR) and phase-doMain induction machine models for nodal-analysis-based electromagnetic transients programs (EMTP-type) offer an excellent combination of numerical stability, accuracy, and efficiency. However, incorporation of magnetic saturation in these models renders their interfacing circuits dependent on the operating segment of the piecewise-linear saturation characteristics. Consequently, refactorization of the network's conductance matrix is required during simulations, which reduces the numerical efficiency of the overall solution and limits the models' range of application. This paper presents a new VBR squirrel-cage induction machine model that includes Main Flux saturation and possesses a saturation-independent constant-parameter interfacing circuit. Case studies in PSCAD/EMTDC demonstrate that the proposed model offers similar numerical stability and accuracy to the state-of-the-art models, while considerably increasing simulation speed for practical multimachine systems.
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Constant-Parameter Voltage-Behind-Reactance Induction Machine Model Including Main Flux Saturation
IEEE Transactions on Energy Conversion, 2015Co-Authors: Francis Therrien, Mehrdad Chapariha, Juri JatskevichAbstract:Interfacing of electrical machine models with ac power networks has a significant impact on numerical accuracy and efficiency in state-variable-based transient simulation programs. This paper continues the recent work in this area by proposing a new explicit constant-parameter voltage-behind-reactance (VBR) induction machine model that includes Main Flux saturation and allows a direct interface to any external network. The proposed model uses numerical approximations to achieve a decoupled interfacing circuit with constant RL branches that is easy to use in many simulation programs. Computer studies demonstrate that the proposed model provides high numerical accuracy for machines with a diverse range of parameters, even at fairly large integration step sizes.
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Efficient Explicit Representation of AC Machines Main Flux Saturation in State-Variable-Based Transient Simulation Packages
IEEE Transactions on Energy Conversion, 2013Co-Authors: Francis Therrien, Juri Jatskevich, Liwei Wang, Oleg WasynczukAbstract:Inclusion of magnetic saturation in low-order qd models of induction and synchronous machines improves the accuracy of system studies. Over the years, numerous explicit and implicit methods of representing magnetic saturation have been proposed in the literature, some of which find their use in commonly used transient simulation packages. This paper presents a straightforward and improved Flux correction method of modeling saturation explicitly in classical qd state variable ac machine models. The approach requires limited additional information and avoids the need for a dynamic inductance, which is present in many other approaches. The method is first developed for induction machines and then extended to salient-pole synchronous machines as a more general case. Computer studies demonstrate the accuracy of the proposed method for predicting the dynamic and steady-state cross-saturation phenomena, as well as its computational advantages.
Francis Therrien - One of the best experts on this subject based on the ideXlab platform.
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Constant-parameter synchronous machine model including Main Flux saturation
IET Electric Power Applications, 2016Co-Authors: Francis Therrien, Mehrdad Chapariha, Juri JatskevichAbstract:This paper presents a new general-purpose state-space synchronous machine model based on the voltage-behind-reactance (VBR) formulation which accounts for Main Flux saturation. The proposed model has a numerically efficient constant-parameter decoupled RL branch interfacing circuit comprised of the stator and field windings. Consequently, the new model can be interfaced directly with arbitrary power networks and exciter circuits. The presented studies, executed using the Simulink toolbox PLECS, demonstrate the superior combination of numerical accuracy and efficiency of the new VBR model compared with existing state-of-the-art models. As a result, the proposed model would be a desirable addition to the built-in component libraries of many industry-grade state-variable-based transient simulators.
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Constant-Parameter Interfacing of Induction Machine Models Considering Main Flux Saturation in EMTP-Type Programs
IEEE Transactions on Energy Conversion, 2016Co-Authors: Francis Therrien, Mehrdad Chapariha, Liwei Wang, Juri JatskevichAbstract:The state-of-the-art magnetically linear voltage-behind-reactance (VBR) and phase-doMain induction machine models for nodal-analysis-based electromagnetic transients programs (EMTP-type) offer an excellent combination of numerical stability, accuracy, and efficiency. However, incorporation of magnetic saturation in these models renders their interfacing circuits dependent on the operating segment of the piecewise-linear saturation characteristics. Consequently, refactorization of the network's conductance matrix is required during simulations, which reduces the numerical efficiency of the overall solution and limits the models' range of application. This paper presents a new VBR squirrel-cage induction machine model that includes Main Flux saturation and possesses a saturation-independent constant-parameter interfacing circuit. Case studies in PSCAD/EMTDC demonstrate that the proposed model offers similar numerical stability and accuracy to the state-of-the-art models, while considerably increasing simulation speed for practical multimachine systems.
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Constant-Parameter Voltage-Behind-Reactance Induction Machine Model Including Main Flux Saturation
IEEE Transactions on Energy Conversion, 2015Co-Authors: Francis Therrien, Mehrdad Chapariha, Juri JatskevichAbstract:Interfacing of electrical machine models with ac power networks has a significant impact on numerical accuracy and efficiency in state-variable-based transient simulation programs. This paper continues the recent work in this area by proposing a new explicit constant-parameter voltage-behind-reactance (VBR) induction machine model that includes Main Flux saturation and allows a direct interface to any external network. The proposed model uses numerical approximations to achieve a decoupled interfacing circuit with constant RL branches that is easy to use in many simulation programs. Computer studies demonstrate that the proposed model provides high numerical accuracy for machines with a diverse range of parameters, even at fairly large integration step sizes.
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Efficient Explicit Representation of AC Machines Main Flux Saturation in State-Variable-Based Transient Simulation Packages
IEEE Transactions on Energy Conversion, 2013Co-Authors: Francis Therrien, Juri Jatskevich, Liwei Wang, Oleg WasynczukAbstract:Inclusion of magnetic saturation in low-order qd models of induction and synchronous machines improves the accuracy of system studies. Over the years, numerous explicit and implicit methods of representing magnetic saturation have been proposed in the literature, some of which find their use in commonly used transient simulation packages. This paper presents a straightforward and improved Flux correction method of modeling saturation explicitly in classical qd state variable ac machine models. The approach requires limited additional information and avoids the need for a dynamic inductance, which is present in many other approaches. The method is first developed for induction machines and then extended to salient-pole synchronous machines as a more general case. Computer studies demonstrate the accuracy of the proposed method for predicting the dynamic and steady-state cross-saturation phenomena, as well as its computational advantages.
Dionysios C. Aliprantis - One of the best experts on this subject based on the ideXlab platform.
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Wound-rotor induction machine model with saturation and high-frequency effects
2014 International Conference on Electrical Machines (ICEM), 2014Co-Authors: Dionysios C. AliprantisAbstract:This paper sets forth a novel model of a wound-rotor induction machine, which incorporates magnetic saturation of the Main Flux path and high-frequency effects. The model's experimental parameterization procedure is described in detail. This consists of standstill frequency response tests, and a test for determining the machine's magnetizing characteristic and turns ratio. Time-doMain simulations are used to highlight the capabilities of the proposed model, and to compare its predictions with those of a classical model at both transient and steady states.
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Experimental parameterization procedure for a wound- rotor induction generator
2013 IEEE Power and Energy Conference at Illinois (PECI), 2013Co-Authors: Dionysios C. AliprantisAbstract:This paper sets forth an experimental parameterization procedure for a novel qd equivalent circuit model of a wound-rotor induction generator. The model incorporates magnetic saturation of the Main Flux path, and high-frequency effects using standstill frequency response testing. Notably, the procedure also yields the machine's turns ratio.
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genetic algorithm based parameter identification of a hysteretic brushless exciter model
IEEE Transactions on Energy Conversion, 2006Co-Authors: Dionysios C. Aliprantis, S D Sudhoff, B T KuhnAbstract:In this paper, a parameter identification procedure for a recently proposed hysteretic brushless exciter model is discussed. The model features average-value representation of all rectification modes, and incorporation of magnetic hysteresis in the d-axis Main Flux path using Preisach's theory. Herein, a method for obtaining the model's parameters from the waveforms of exciter field current and Main alternator terminal voltage is set forth. In particular, a genetic algorithm is employed to solve the optimization problem of minimizing the model's prediction error during a change in reference voltage level.
Narayan C. Kar - One of the best experts on this subject based on the ideXlab platform.
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Effects of Main and leakage Flux saturation on the transient performances of doubly-fed wind driven induction generator
Electric Power Systems Research, 2007Co-Authors: Hany M. Jabr, Narayan C. KarAbstract:Doubly-fed induction generators are gaining more attention especially in the field of wind power generation due to their many advantages and the rapid development in both power electronics and control strategies. In this paper, a new saturated doubly-fed induction generator model is proposed. This model takes into account both Main Flux saturation and leakage Flux saturation. The effect of the Main Flux saturation and the leakage Flux saturation on the determination of the transient performances of doubly-fed induction generator under different transient conditions such as step change in input power, voltage sag and short-circuit at the terminals is the Main objective of this paper. It has been demonstrated that although the inclusion of the Main Flux saturation in the generator modelling is important, the effect of the leakage Flux saturation is the most dominant in the determination of the transient performances in the first few cycles following the transient.
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Effect of Short-Circuit Voltage Profile on the Transient Performance of Saturated Permanent Magnet Synchronous Motors
2007 IEEE Power Engineering Society General Meeting, 2007Co-Authors: S. Najafi, Narayan C. KarAbstract:When permanent magnet synchronous motors are subjected to short-circuit at their terminals, the accurate calculation of the motor transient performance depends on the short- circuit voltage profile and the saturation condition of the Main Flux paths. In this paper, a voltage profile due to a short-circuit at the motor terminals is proposed where the motor terminal voltage requires a certain period of time to fall to zero value and, following the clearing of the fault, the terminal voltage also requires a certain period of time to recover to a post-short-circuit value. Three models of permanent magnet synchronous motors have been developed to demonstrate the effect of the Main Flux saturation on the determination of the transient performance of permanent magnet synchronous motors employing the proposed short- circuit voltage profile.
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CCECE - Effect of Voltage Sag on the Transient Performance of Saturated Synchronous Motors
2006 Canadian Conference on Electrical and Computer Engineering, 2006Co-Authors: Narayan C. Kar, A.m. El-serafiAbstract:When synchronous motors are subjected to voltage sags at their terminals, the accurate calculation of the motor transient performance depends on the saturation conditions of their Main Flux paths. In this paper, a computer model for saturated synchronous motors has been developed using the synchronous machine voltage and Flux linkage differential equations considering the saturation. The effect of the Main Flux saturation both in the direct and quadrature axes and of the cross-magnetizing phenomenon (the magnetic coupling between the direct and quadrature axes) on the determination of the transient performance of synchronous motors due to the voltage sag at the terminals is the Main objective of this paper.
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Effect of the Main Flux saturation on the transient short-circuit performance of synchronous machines
Canadian Conference on Electrical and Computer Engineering 2005., 1Co-Authors: Narayan C. Kar, A.m. El-serafiAbstract:In the transient short-circuit analysis of saturated synchronous machines, the accurate calculation of the stator and rotor currents depends, particularly during the first few cycles of the transient process (the subtransient period), on the saturation conditions of their Main and leakage Flux paths. In this paper, a computer model for saturated synchronous machines has been developed using the synchronous machine voltage and Flux linkage differential equations considering the machine Main Flux saturation. The effect of the Main Flux saturation both in the direct and quadrature axes and of the cross-magnetizing phenomenon (the magnetic coupling between the direct and quadrature axes) on the determination of the transient short-circuit performance of synchronous machines is the Main objective of this paper
