The Experts below are selected from a list of 24825 Experts worldwide ranked by ideXlab platform
Juha Saari - One of the best experts on this subject based on the ideXlab platform.
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Performance calculation for a high-speed solid-rotor induction motor
IEEE Transactions on Industrial Electronics, 2012Co-Authors: Jacek F Gieras, Juha SaariAbstract:The paper deals with analytical method of design and prediction of performance characteristics for induction motors with solid steel rotor coated with copper layer. On the basis of the distribution of the 2-D electromagnetic field, the Equivalent Impedance of the rotor has been derived. The edge effect and nonlinear magnetic permeability of solid steel have been included. The presented analytical method has been verified with laboratory test results. A 300 kW, 60 000-rpm, three-phase solid-rotor induction motor for the next generation air compressor has been investigated. The accuracy of analytical approach is acceptable and can be recommended for rapid design of solid-rotor induction motors.
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performance calculation for a high speed solid rotor induction motor
Conference of the Industrial Electronics Society, 2010Co-Authors: Jacek F Gieras, Juha SaariAbstract:The paper deals with analytical method of design and prediction of performance characteristics for induction motors with solid steel rotor coated with copper layer. On the basis of the distribution of the 2D electromagnetic field, the Equivalent Impedance of the rotor have been derived. The edge effect and nonlinear magnetic permeability of solid steel have been included. The presented analytical method has been verified with laboratory test results. A 300 kW, 60 000-rpm, three-phase solid rotor induction motor for air compressor has been investigated. The accuracy of analytical approach is acceptable and can be recommended for rapid design of solid rotor induction motors.
Xin Kong - One of the best experts on this subject based on the ideXlab platform.
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erratum to consensus virtual output Impedance control based on the novel droop Equivalent Impedance concept for a multi bus radial microgrid
IEEE Transactions on Energy Conversion, 2020Co-Authors: Yi Chyn Cassandra Wong, Chee Shen Lim, Mihai Rotaru, Andrew Cruden, Xin KongAbstract:Most of the existing reactive power sharing schemes that assume parallel architecture are known to be less effective for multi-bus radial microgrids. This article proposes an improved reactive power sharing scheme that exploits the novel concept of droop Equivalent Impedance into designing a consensus virtual-output-Impedance-based droop control scheme. The control scheme leads to two notable improvements: (a) it proves that only either virtual resistance or virtual reactance is sufficient to restore proportional reactive power sharing; (b) only a global coupling gain needs to be tuned and no proportional-integral controller is required. A systematic guideline that establishes the approximate range of stable coupling gain is developed. This simplifies the tuning process of the coupling gain. The power correction performance, the resulting bus voltage behavior, consensus control stability, and the robustness to time delay have been investigated in conjunction with an islanded microgrid modified from the IEEE 34 Node Test Feeder. It is shown that the consensus control scheme is capable to demonstrate accurate power sharing regardless of the changes in the network topology, network Impedances, loading conditions, and communication delay.
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Consensus virtual output Impedance control based on the novel droop Equivalent Impedance concept for a multi-bus radial microgrid
'Institute of Electrical and Electronics Engineers (IEEE)', 2020Co-Authors: Wong, Yi Chyn Cassandra, Cruden Andrew, Lim Chee, Rotaru, Mihai D, Xin KongAbstract:Most of the existing reactive power sharing schemes that assume parallel architecture are known to be less effective for multi-bus radial microgrids. This paper proposes an improved reactive power sharing scheme that exploits the novel concept of droop Equivalent Impedance into designing a consensus virtual-output-Impedance-based droop control scheme. The control scheme leads to two notable improvements: (a) it proves that only either virtual resistance or virtual reactance is sufficient to restore proportionate reactive power sharing; (b) only a global coupling gain needs to be tuned and no proportional-integral controller is required. A systematic guideline that establishes the approximate range of stable coupling gain is developed. This simplifies the tuning process of the coupling gain. The power correction performance, the resulting bus voltage behavior, consensus control stability, and the robustness to time delay have been investigated in conjunction with an islanded microgrid modified from the IEEE 34 Node Test Feeder. It is shown that the consensus control scheme is capable to demonstrate accurate power sharing regardless of the changes in the network topology, network Impedances, loading conditions, and communication delay
Roberto Quaglia - One of the best experts on this subject based on the ideXlab platform.
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design of an 87 fractional bandwidth doherty power amplifier supported by a simplified bandwidth estimation method
IEEE Transactions on Microwave Theory and Techniques, 2018Co-Authors: Jorge Julian Moreno Rubio, Vittorio Camarchia, Marco Pirola, Roberto QuagliaAbstract:This paper presents a novel technique for the design of broadband Doherty power amplifiers (DPAs), supported by a simplified approach for the initial bandwidth estimation that requires linear simulations only. The Equivalent Impedance of the Doherty inverter is determined by the value of the output capacitance of the power device, and the Doherty combiner is designed following this initial choice and using a microstrip network. A GaN-based single-input DPA designed adopting this method exhibits, on a state-of-the-art bandwidth of 87% (1.5–3.8 GHz), a measured output power of around 20 W with 6 dB back-off efficiency between 33% and 55%, with a gain higher than 10 dB. System-level measurements prove the linearizability of the designed Doherty amplifier when a modulated signal is applied.
Jacek F Gieras - One of the best experts on this subject based on the ideXlab platform.
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Performance calculation for a high-speed solid-rotor induction motor
IEEE Transactions on Industrial Electronics, 2012Co-Authors: Jacek F Gieras, Juha SaariAbstract:The paper deals with analytical method of design and prediction of performance characteristics for induction motors with solid steel rotor coated with copper layer. On the basis of the distribution of the 2-D electromagnetic field, the Equivalent Impedance of the rotor has been derived. The edge effect and nonlinear magnetic permeability of solid steel have been included. The presented analytical method has been verified with laboratory test results. A 300 kW, 60 000-rpm, three-phase solid-rotor induction motor for the next generation air compressor has been investigated. The accuracy of analytical approach is acceptable and can be recommended for rapid design of solid-rotor induction motors.
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performance calculation for a high speed solid rotor induction motor
Conference of the Industrial Electronics Society, 2010Co-Authors: Jacek F Gieras, Juha SaariAbstract:The paper deals with analytical method of design and prediction of performance characteristics for induction motors with solid steel rotor coated with copper layer. On the basis of the distribution of the 2D electromagnetic field, the Equivalent Impedance of the rotor have been derived. The edge effect and nonlinear magnetic permeability of solid steel have been included. The presented analytical method has been verified with laboratory test results. A 300 kW, 60 000-rpm, three-phase solid rotor induction motor for air compressor has been investigated. The accuracy of analytical approach is acceptable and can be recommended for rapid design of solid rotor induction motors.
Jorge Julian Moreno Rubio - One of the best experts on this subject based on the ideXlab platform.
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design of an 87 fractional bandwidth doherty power amplifier supported by a simplified bandwidth estimation method
IEEE Transactions on Microwave Theory and Techniques, 2018Co-Authors: Jorge Julian Moreno Rubio, Vittorio Camarchia, Marco Pirola, Roberto QuagliaAbstract:This paper presents a novel technique for the design of broadband Doherty power amplifiers (DPAs), supported by a simplified approach for the initial bandwidth estimation that requires linear simulations only. The Equivalent Impedance of the Doherty inverter is determined by the value of the output capacitance of the power device, and the Doherty combiner is designed following this initial choice and using a microstrip network. A GaN-based single-input DPA designed adopting this method exhibits, on a state-of-the-art bandwidth of 87% (1.5–3.8 GHz), a measured output power of around 20 W with 6 dB back-off efficiency between 33% and 55%, with a gain higher than 10 dB. System-level measurements prove the linearizability of the designed Doherty amplifier when a modulated signal is applied.