The Experts below are selected from a list of 27015 Experts worldwide ranked by ideXlab platform
S D Sudhoff - One of the best experts on this subject based on the ideXlab platform.
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an inner rotor flux modulated permanent magnet Synchronous Machine for low speed high torque applications
IEEE Transactions on Energy Conversion, 2015Co-Authors: J Crider, S D SudhoffAbstract:Applications for low-speed high-torque Machines include marine propulsion and wind power generation. Since electric Machinery size is more directly related to required torque than to required power, high required torque leads to large Machines. Mechanical gears increase the speed and lower the required torque of the Machine to reduce size. This, however, results in increased noise and maintenance, and decreased reliability. Magnetic gears offer the advantages of mechanical gears without the disadvantages created by physical contact. Integrating magnetic gears into the Machine structure offers additional mass savings. This study proposes a novel Machine architecture, which integrates magnetic gearing and a permanent magnet Synchronous Machine to create an inner rotor flux-modulated permanent magnet Synchronous Machine. Unlike previous arrangements, the proposed Machine utilizes a more desirable inner rotor configuration and avoids multiple magnet arrays. This study presents a finite–element-based design model of the proposed Machine to be utilized in an optimization-based design environment. A multiobjective design study is presented for a laboratory scale application. The resulting tradeoff between mass and loss is compared with that of a permanent magnet Synchronous Machine for the same application.
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a Synchronous Machine model with saturation and arbitrary rotor network representation
IEEE Transactions on Energy Conversion, 2005Co-Authors: Dionysios C Aliprantis, S D Sudhoff, B T KuhnAbstract:This paper addresses equivalent circuit and magnetic saturation issues associated with Synchronous Machine modeling. In the proposed Synchronous Machine model, the rotor equivalent circuits are replaced by arbitrary linear networks. This allows for elimination of the equivalent circuit parameter identification procedure since the measured frequency response may be directly embedded into the model. Magnetic saturation is also represented in both the q- and d-axis. The model is computationally efficient and suitable for dynamic time-domain power system studies.
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experimental characterization procedure for a Synchronous Machine model with saturation and arbitrary rotor network representation
IEEE Transactions on Energy Conversion, 2005Co-Authors: Dionysios C Aliprantis, S D Sudhoff, B T KuhnAbstract:This paper sets forth the experimental procedure for obtaining the parameter set of a Synchronous Machine model with saturation and arbitrary linear network representation for the rotor. The method utilizes a combination of magnetization curves and standstill frequency-response tests. A novel test procedure is proposed for obtaining the turns ratio. The rotor's transfer function and stator leakage inductance are extracted from the frequency response using genetic algorithms.
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an improved method for incorporating magnetic saturation in the q d Synchronous Machine model
IEEE Transactions on Energy Conversion, 1998Co-Authors: Keith Corzine, S D Sudhoff, B T Kuhn, H J HegnerAbstract:An improved technique for incorporating saturation into the q-d axis model (Park's model) of a Synchronous Machine is proposed. By choosing magnetizing flux linkage as a state variable, iterative procedures required by traditional methods are avoided. The saturation function is represented by an arctangent function which has some distinct advantages over polynomial representations and look-up tables. In particular, the parameters of the proposed function all have physical significance and the proposed function is defined over an infinite range of flux linkage. The model is verified for steady-state and transient conditions using a laboratory Synchronous Machine-rectifier system similar to those commonly used for naval and aerospace power generation.
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transient and dynamic average value modeling of Synchronous Machine fed load commutated converters
IEEE Transactions on Energy Conversion, 1996Co-Authors: S D Sudhoff, Keith Corzine, H J Hegner, D E DelisleAbstract:A new average-value model of a Synchronous Machine fed load-commutated converter is set forth in which the stator dynamics are combined with the DC link dynamics. This model is shown to he extremely accurate in predicting system transients and in predicting frequency-domain characteristics such as the impedance looking into the Synchronous Machine fed load-commutated converter. The model is verified against a detailed computer simulation and against a hardware test system, thus providing a three-way comparison. The proposed model is shown to be much more accurate than models in which the stator dynamics are neglected.
O Wasynczuk - One of the best experts on this subject based on the ideXlab platform.
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a voltage behind reactance Synchronous Machine model with saturation and arbitrary rotor network representation
IEEE Transactions on Energy Conversion, 2008Co-Authors: Dionysios C Aliprantis, O Wasynczuk, C Rodriguez D ValdezAbstract:A voltage-behind-reactance formulation of a Synchronous Machine model is set forth, which incorporates saturation and cross-saturation, and is general enough to encapsulate a variety of rotor structures by use of arbitrary linear networks instead of equivalent circuits. Specifically, the model's equations - originally expressed in the qd-axes framework - are rewritten in such a way as to allow the actual abc stator windings to be represented by inductive branches, which can then be naturally connected in the desired circuit topology, e.g., to a rectifier. The model's predictions are validated against experimental results.
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an efficient and accurate model for the simulation and analysis of Synchronous Machine converter systems
IEEE Transactions on Energy Conversion, 1998Co-Authors: Steven D Pekarek, O Wasynczuk, H J HegnerAbstract:A new Synchronous Machine model is presented which is readily implemented in either circuit-based or differential-equation-based simulation programs. This model is well suited for the simulation and analysis of Synchronous Machine-power converter systems. It is based upon standard representations and no approximations are made in its derivation. However, the numerical implementation is shown to be significantly more efficient. An example is provided which demonstrates a 1700% increase in simulation speed with no observable loss in accuracy. The model includes provisions for an arbitrary number of damper or rotor windings and may be easily modified to represent Synchronous or induction Machines with an arbitrary number of stator phases.
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analysis and average value modeling of line commutated converter Synchronous Machine systems
IEEE Transactions on Energy Conversion, 1993Co-Authors: S D Sudhoff, O WasynczukAbstract:Analytical relationships are established which can be used to predict the steady-state characteristics of line-commutated AC-DC-converter-Synchronous Machine systems. In particular, basic relationships are established in which the average DC voltage and the average electromagnetic torque are related to the converter firing delay angle. It is shown that these average-value relationships predict the steady-state performance with significantly higher accuracy than the classical converter average-value equations in which the d-axis subtransient reactance is used as the commutating reactance. >
Juri Jatskevich - One of the best experts on this subject based on the ideXlab platform.
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Magnetically-saturable voltage-behind-reactance Synchronous Machine model for EMTP-type solution
2012 IEEE Power and Energy Society General Meeting, 2012Co-Authors: Liwei Wang, Juri JatskevichAbstract:Summary form only given: A so-called voltage-behind-reactance (VBR) Machine model has recently been proposed for the electro-magnetic transient programs (EMTP) as an advantageous alternative to the conventional qd and phase-domain models. This paper extends the previous research and proposes a magnetically saturable VBR Synchronous Machine model for EMTP-type solutions. The proposed saturable VBR model utilizes the saliency factor approach to represent main-flux saturation for the salient-pole Synchronous Machines with the qd axes static and dynamic cross saturation included. An efficient piecewise-linear method is used for representing the nonlinear saturation characteristic within the discretized EMTP solution. Case studies verify that the new model maintains the improved numerical accuracy in steady state and transients even with large time step.
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Magnetically-Saturable Voltage-Behind-Reactance Synchronous Machine Model for EMTP-Type Solution
IEEE Transactions on Power Systems, 2011Co-Authors: Liwei Wang, Juri JatskevichAbstract:A so-called voltage-behind-reactance (VBR) Machine model has recently been proposed for the electro-magnetic transient programs (EMTP) as an advantageous alternative to the conventional qd and phase-domain models. This paper extends the previous research and proposes a magnetically saturable VBR Synchronous Machine model for EMTP-type solutions. The proposed saturable VBR model utilizes the saliency factor approach to represent main-flux saturation for the salient-pole Synchronous Machines with the qd axes static and dynamic cross saturation included. An efficient piecewise-linear method is used for representing the nonlinear saturation characteristic within the discretized EMTP solution. Case studies verify that the new model maintains the improved numerical accuracy in steady state and transients even with large time step.
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re examination of Synchronous Machine modeling techniques for electromagnetic transient simulations
IEEE Transactions on Power Systems, 2007Co-Authors: Liwei Wang, Juri Jatskevich, H W DommelAbstract:This paper re-examines the three Synchronous Machine modeling techniques used for electromagnetic transient simulations, namely, the qd model, phase-domain model, and voltage-behind-reactance model. Contrary to the claims made in several recent publications, these models are all equivalent in the continuous-time domain, as their corresponding differential equations can be algebraically derived from each other. Computer studies of a single-Machine infinite-bus system demonstrate that all of these models can be used for unsymmetrical operation of power systems. The conversion of Machine parameters is also discussed and is shown to have some impact on simulation accuracy, which is acceptable for most cases. When the models are discretized and interfaced with an EMTP-type network solution, the voltage-behind-reactance model is shown to be the most accurate due to its advanced structure.
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A Voltage-Behind-Reactance Synchronous Machine Model for the EMTP-Type Solution
2007 IEEE Power Engineering Society General Meeting, 2007Co-Authors: Liwei Wang, Juri JatskevichAbstract:Summary form only given. A full-order, voltage-behind-reactance Synchronous Machine model has recently been proposed in the literature. This paper extends the voltage-behind-reactance formulation for the EMTP-type solution, in which the rotor subsystem is expressed in q-d coordinates and the stator subsystem is expressed in abc phase coordinates. The model interface with the nodal-analysis network solution is non-iterative and simultaneous. An example of a single-Machine, infinite-bus system shows that the proposed model is more accurate and efficient than several existing EMTP Machine models.
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a voltage behind reactance Synchronous Machine model for the emtp type solution
IEEE Transactions on Power Systems, 2006Co-Authors: Liwei Wang, Juri JatskevichAbstract:A full-order, voltage-behind-reactance Synchronous Machine model has recently been proposed in the literature. This paper extends the voltage-behind-reactance formulation for the electromagnetic transient program (EMTP)-type solution, in which the rotor subsystem is expressed in qd coordinates and the stator subsystem is expressed in abc phase coordinates. The model interface with the nodal-analysis network solution is non-iterative and simultaneous. An example of a single-Machine, infinite-bus system shows that the proposed model is more accurate and efficient than several existing EMTP Machine models
Dionysios C Aliprantis - One of the best experts on this subject based on the ideXlab platform.
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Synchronous Machine model with voltage behind reactance formulation of stator and field windings
Power and Energy Society General Meeting, 2013Co-Authors: Aaron M Cramer, Benjamin P Loop, Dionysios C AliprantisAbstract:Summary form only given. A Synchronous Machine model with saturation and cross saturation and an arbitrary rotor network representation that uses a voltage-behind-reactance representation for both the stator windings and the field winding of the Machine is proposed. This allows the stator windings and the field winding to be represented as branches in a circuit solver, permitting straightforward simulation with connected circuitry. In particular, the model can be simulated with rectifier loads or with rectifier sources applied to the field winding. The model is validated against experimental data, and its utility is demonstrated in an excitation failure case study.
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Synchronous Machine model with voltage behind reactance formulation of stator and field windings
IEEE Transactions on Energy Conversion, 2012Co-Authors: Aaron M Cramer, Benjamin P Loop, Dionysios C AliprantisAbstract:A Synchronous Machine model with saturation and cross saturation and an arbitrary rotor network representation that uses a voltage-behind-reactance representation for both the stator windings and the field winding of the Machine is proposed. This allows the stator windings and the field winding to be represented as branches in a circuit solver, permitting straightforward simulation with connected circuitry. In particular, the model can be simulated with rectifier loads or with rectifier sources applied to the field winding. The model is validated against experimental data, and its utility is demonstrated in an excitation failure case study.
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a voltage behind reactance Synchronous Machine model with saturation and arbitrary rotor network representation
IEEE Transactions on Energy Conversion, 2008Co-Authors: Dionysios C Aliprantis, O Wasynczuk, C Rodriguez D ValdezAbstract:A voltage-behind-reactance formulation of a Synchronous Machine model is set forth, which incorporates saturation and cross-saturation, and is general enough to encapsulate a variety of rotor structures by use of arbitrary linear networks instead of equivalent circuits. Specifically, the model's equations - originally expressed in the qd-axes framework - are rewritten in such a way as to allow the actual abc stator windings to be represented by inductive branches, which can then be naturally connected in the desired circuit topology, e.g., to a rectifier. The model's predictions are validated against experimental results.
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a Synchronous Machine model with saturation and arbitrary rotor network representation
IEEE Transactions on Energy Conversion, 2005Co-Authors: Dionysios C Aliprantis, S D Sudhoff, B T KuhnAbstract:This paper addresses equivalent circuit and magnetic saturation issues associated with Synchronous Machine modeling. In the proposed Synchronous Machine model, the rotor equivalent circuits are replaced by arbitrary linear networks. This allows for elimination of the equivalent circuit parameter identification procedure since the measured frequency response may be directly embedded into the model. Magnetic saturation is also represented in both the q- and d-axis. The model is computationally efficient and suitable for dynamic time-domain power system studies.
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experimental characterization procedure for a Synchronous Machine model with saturation and arbitrary rotor network representation
IEEE Transactions on Energy Conversion, 2005Co-Authors: Dionysios C Aliprantis, S D Sudhoff, B T KuhnAbstract:This paper sets forth the experimental procedure for obtaining the parameter set of a Synchronous Machine model with saturation and arbitrary linear network representation for the rotor. The method utilizes a combination of magnetization curves and standstill frequency-response tests. A novel test procedure is proposed for obtaining the turns ratio. The rotor's transfer function and stator leakage inductance are extracted from the frequency response using genetic algorithms.
B T Kuhn - One of the best experts on this subject based on the ideXlab platform.
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a Synchronous Machine model with saturation and arbitrary rotor network representation
IEEE Transactions on Energy Conversion, 2005Co-Authors: Dionysios C Aliprantis, S D Sudhoff, B T KuhnAbstract:This paper addresses equivalent circuit and magnetic saturation issues associated with Synchronous Machine modeling. In the proposed Synchronous Machine model, the rotor equivalent circuits are replaced by arbitrary linear networks. This allows for elimination of the equivalent circuit parameter identification procedure since the measured frequency response may be directly embedded into the model. Magnetic saturation is also represented in both the q- and d-axis. The model is computationally efficient and suitable for dynamic time-domain power system studies.
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experimental characterization procedure for a Synchronous Machine model with saturation and arbitrary rotor network representation
IEEE Transactions on Energy Conversion, 2005Co-Authors: Dionysios C Aliprantis, S D Sudhoff, B T KuhnAbstract:This paper sets forth the experimental procedure for obtaining the parameter set of a Synchronous Machine model with saturation and arbitrary linear network representation for the rotor. The method utilizes a combination of magnetization curves and standstill frequency-response tests. A novel test procedure is proposed for obtaining the turns ratio. The rotor's transfer function and stator leakage inductance are extracted from the frequency response using genetic algorithms.
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an improved method for incorporating magnetic saturation in the q d Synchronous Machine model
IEEE Transactions on Energy Conversion, 1998Co-Authors: Keith Corzine, S D Sudhoff, B T Kuhn, H J HegnerAbstract:An improved technique for incorporating saturation into the q-d axis model (Park's model) of a Synchronous Machine is proposed. By choosing magnetizing flux linkage as a state variable, iterative procedures required by traditional methods are avoided. The saturation function is represented by an arctangent function which has some distinct advantages over polynomial representations and look-up tables. In particular, the parameters of the proposed function all have physical significance and the proposed function is defined over an infinite range of flux linkage. The model is verified for steady-state and transient conditions using a laboratory Synchronous Machine-rectifier system similar to those commonly used for naval and aerospace power generation.
