The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Rong Hua - One of the best experts on this subject based on the ideXlab platform.
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Modeling and Analysis of Inductive Power Transfer System With Passive Matrix Power Repeater
IEEE Transactions on Industrial Electronics, 2019Co-Authors: Rong HuaAbstract:This paper presents a detailed modeling and analysis of an inductive Power transfer (IPT) system with a passive Matrix Power repeater. A high-order mathematical model is established to characterize the output Power by taking all the mutual inductances among the primary, secondary, and the unit cells of Matrix Power repeaters into considerations. The model is used to analyze the relationship between the output Power and the operating frequency of an IPT system with a 3 × 3 Matrix Power repeater. The study shows the optimal operating frequencies corresponding to maximum and minimum Power transfer exist owing to the interactions among the magnetic fields generated by the primary current and induced currents of the unit cells of the Matrix Power repeater. The theoretical optimal frequencies for obtaining the maximum and minimum output Power are determined by numerical analysis based on the proposed model, and they are verified by circuit simulation and experimental study within an error of 2%. The results are useful for Power flow controller design with enhanced and reduced Power regulation range.
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The effect of Matrix Power repeaters on magnetic field distribution of IPT systems
2017 IEEE Energy Conversion Congress and Exposition (ECCE), 2017Co-Authors: Rong Hua, Ho Fai LeungAbstract:Matrix Power repeaters (MPRs) have been used in high frequency radio systems for enhancing the signal propagation, as well as wireless Power transfer systems for extending the Power transfer range. However, their effect on the magnetic field distribution of inductive Power transfer (IPT) systems is still not clear. This paper presents both the positive and negative effects of MPRs for enhancing or reducing the magnetic field coupling in IPT systems. The magnetic field generated by the primary coil and MPRs of an IPT system has been investigated, and the relationship between the effective permeability of a typical MPR and the system operating condition is analysed. A CST (Computer Simulation Technology) model has been set up to simulate the magnetic field distribution, which has also been experimentally verified. Both simulation and experimental results have shown that the magnetic field is enhanced when the system operating frequency is below a critical frequency where the effective permeability of MPRs is −1, and reduced when the system operating frequency is above this critical frequency.
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Enhancing wireless Power transfer capability of inductive Power transfer system using Matrix Power repeater
2017 IEEE 12th International Conference on Power Electronics and Drive Systems (PEDS), 2017Co-Authors: Rong Hua, Bo LongAbstract:Matrix Power repeaters (MPRs) with multiple unit cells have been successfully used in far field radio systems for concentrating electromagnetic waves. However, their effects on the field distribution in non-radiative near field wireless Power transfer systems are not well understood. This paper is to propose a new method for enhancing the wireless Power transfer capability of Inductive Power transfer (IPT) systems using MPRs. A system model is established by considering the contributions of each individual unit cell of a typical MPR, which is used to analyze the Power transfer performance of an IPT system. A critical condition in relation to the mutual inductances between the primary/ secondary coils and MPR individual coils is determined, which defines the boundary between enhancing and reducing the Power transfer of an IPT system. A practical MPR is built and tested to meet the Power transfer enhancement condition, and experimental results show that the output Power of an IPT system is increased by 34.4%.
E. F. Galba - One of the best experts on this subject based on the ideXlab platform.
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Expansions of Weighted Pseudoinverses with Mixed Weights into Matrix Power Series and Power Products
Cybernetics and Systems Analysis, 2019Co-Authors: E. F. Galba, N. A. VareniukAbstract:Expansions of weighted pseudoinverses with mixed weights into Matrix Power series or Power products with negative exponents are defined and analyzed. One of these matrices is positive definite and the other is nonsingular and indefinite. Polynomial limit representations of these matrices are obtained. Regularized iterative methods are constructed to evaluate weighted pseudoinverses with mixed weights.
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Weighted Pseudoinversion with Indefinite Weights
Ukrainian Mathematical Journal, 2018Co-Authors: N. A. Varenyuk, I. V. Sergienko, E. F. Galba, A. N. KhimichAbstract:We present the definition of weighted pseudoinverse matrices with nondegenerate weights of indefinite sign and study these matrices. The theorems on existence and uniqueness for these matrices are proved. The weighted pseudoinverse matrices with indefinite weights are represented in terms of the coefficients of characteristic polynomials of symmetrized matrices. The decompositions of weighted pseudoinverse matrices into Matrix Power series and products and their limit representations are obtained. We also propose regularized iterative methods for the determination of these matrices.
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Weighted Pseudoinversion with Singular Weights
Cybernetics and Systems Analysis, 2016Co-Authors: I. V. Sergienko, E. F. GalbaAbstract:The paper reviews the development of the theory of weighted pseudoinversion. Weighted pseudoinverse matrices with singular weights are determined and investigated. Theorems of the existence and uniqueness of these matrices are provided. Weighted pseudoinverses with singular weights are related to weighted normal pseudosolutions. Weighted pseudoinverses with singular weights are represented in terms of coefficients of characteristic polynomials of symmetric and symmetrizable matrices. Their expansions into Matrix Power series and products and limit representations are obtained. Decompositions of weighed pseudoinverses are determined on the basis of the obtained weighed singular decomposition of matrices with singular weights.
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Necessary and Sufficient Conditions for the Existence of Weighted Singular-Valued Decompositions of Matrices with Singular Weights
Ukrainian Mathematical Journal, 2015Co-Authors: I. V. Sergienko, E. F. Galba, V. S. DeinekaAbstract:A weighted singular-valued decomposition of matrices with singular weights is obtained by using orthogonal matrices. The necessary and sufficient conditions for the existence of the constructed weighted singular-valued decomposition are established. The indicated singular-valued decomposition of matrices is used to obtain a decomposition of their weighted pseudoinverse matrices and decompose them into Matrix Power series and products. The applications of these decompositions are discussed.
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Weighted Singular Value Decomposition of Matrices with Singular Weights Based on Weighted Orthogonal Transformations
Cybernetics and Systems Analysis, 2015Co-Authors: I. V. Sergienko, E. F. GalbaAbstract:Two variants of weighted singular value decompositions of matrices with singular weights using weighted orthogonal matrices are obtained and analyzed. Based on this singular value decompositions of matrices, decomposition of weighted pseudoinverse matrices with singular weights and decomposition of these matrices into Matrix Power series and products are obtained. The application of these decompositions is determined.
I. V. Sergienko - One of the best experts on this subject based on the ideXlab platform.
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Weighted Pseudoinversion with Indefinite Weights
Ukrainian Mathematical Journal, 2018Co-Authors: N. A. Varenyuk, I. V. Sergienko, E. F. Galba, A. N. KhimichAbstract:We present the definition of weighted pseudoinverse matrices with nondegenerate weights of indefinite sign and study these matrices. The theorems on existence and uniqueness for these matrices are proved. The weighted pseudoinverse matrices with indefinite weights are represented in terms of the coefficients of characteristic polynomials of symmetrized matrices. The decompositions of weighted pseudoinverse matrices into Matrix Power series and products and their limit representations are obtained. We also propose regularized iterative methods for the determination of these matrices.
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Weighted Pseudoinversion with Singular Weights
Cybernetics and Systems Analysis, 2016Co-Authors: I. V. Sergienko, E. F. GalbaAbstract:The paper reviews the development of the theory of weighted pseudoinversion. Weighted pseudoinverse matrices with singular weights are determined and investigated. Theorems of the existence and uniqueness of these matrices are provided. Weighted pseudoinverses with singular weights are related to weighted normal pseudosolutions. Weighted pseudoinverses with singular weights are represented in terms of coefficients of characteristic polynomials of symmetric and symmetrizable matrices. Their expansions into Matrix Power series and products and limit representations are obtained. Decompositions of weighed pseudoinverses are determined on the basis of the obtained weighed singular decomposition of matrices with singular weights.
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Necessary and Sufficient Conditions for the Existence of Weighted Singular-Valued Decompositions of Matrices with Singular Weights
Ukrainian Mathematical Journal, 2015Co-Authors: I. V. Sergienko, E. F. Galba, V. S. DeinekaAbstract:A weighted singular-valued decomposition of matrices with singular weights is obtained by using orthogonal matrices. The necessary and sufficient conditions for the existence of the constructed weighted singular-valued decomposition are established. The indicated singular-valued decomposition of matrices is used to obtain a decomposition of their weighted pseudoinverse matrices and decompose them into Matrix Power series and products. The applications of these decompositions are discussed.
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Weighted Singular Value Decomposition of Matrices with Singular Weights Based on Weighted Orthogonal Transformations
Cybernetics and Systems Analysis, 2015Co-Authors: I. V. Sergienko, E. F. GalbaAbstract:Two variants of weighted singular value decompositions of matrices with singular weights using weighted orthogonal matrices are obtained and analyzed. Based on this singular value decompositions of matrices, decomposition of weighted pseudoinverse matrices with singular weights and decomposition of these matrices into Matrix Power series and products are obtained. The application of these decompositions is determined.
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Existence and uniqueness theorems in the theory of weighted pseudoinverses with singular weights
Cybernetics and Systems Analysis, 2011Co-Authors: I. V. Sergienko, Ye. F. Galba, V. S. DeinekaAbstract:Necessary and sufficient conditions for the existence and uniqueness of weighted pseudoinverses with singular weights are obtained. Pseudoinverses are expanded into Matrix Power series and Power products. A relationship is found between weighted pseudoinverses and weighted normal pseudosolutions, and iterative methods are established for calculating pseudoinverses and pseudosolutions.
Michael Braun - One of the best experts on this subject based on the ideXlab platform.
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Passive protection strategy for a drive system with a Matrix converter and an induction machine
IEEE Transactions on Industrial Electronics, 2002Co-Authors: Jochen Mahlein, M. Bruckmann, Michael BraunAbstract:In this paper, the design and testing of a new protection strategy for a Matrix Power converter feeding an induction motor with a squirrel cage rotor is described. The new protection strategy with excellent overvoltage protection allows the removal of the large and expensive diode clamp.
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A Matrix converter without diode clamped over-voltage protection
Proceedings IPEMC 2000. Third International Power Electronics and Motion Control Conference (IEEE Cat. No.00EX435), 1Co-Authors: Jochen Mahlein, Michael BraunAbstract:In this paper, the design and testing of a new protection strategy for a Matrix Power converter feeding an induction motor is described. The new protection strategy, with excellent overvoltage protection, allows to remove the large and expensive diode clamp.
V. S. Deineka - One of the best experts on this subject based on the ideXlab platform.
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Necessary and Sufficient Conditions for the Existence of Weighted Singular-Valued Decompositions of Matrices with Singular Weights
Ukrainian Mathematical Journal, 2015Co-Authors: I. V. Sergienko, E. F. Galba, V. S. DeinekaAbstract:A weighted singular-valued decomposition of matrices with singular weights is obtained by using orthogonal matrices. The necessary and sufficient conditions for the existence of the constructed weighted singular-valued decomposition are established. The indicated singular-valued decomposition of matrices is used to obtain a decomposition of their weighted pseudoinverse matrices and decompose them into Matrix Power series and products. The applications of these decompositions are discussed.
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Existence and uniqueness theorems in the theory of weighted pseudoinverses with singular weights
Cybernetics and Systems Analysis, 2011Co-Authors: I. V. Sergienko, Ye. F. Galba, V. S. DeinekaAbstract:Necessary and sufficient conditions for the existence and uniqueness of weighted pseudoinverses with singular weights are obtained. Pseudoinverses are expanded into Matrix Power series and Power products. A relationship is found between weighted pseudoinverses and weighted normal pseudosolutions, and iterative methods are established for calculating pseudoinverses and pseudosolutions.
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Expansions and polynomial limit representations of weighted pseudoinverses
Computational Mathematics and Mathematical Physics, 2007Co-Authors: E. F. Galba, V. S. Deineka, I. V. SergienkoAbstract:Expansions of weighted pseudoinverses with positive definite or singular weights in Matrix Power series or Power products with negative exponents and arbitrary positive parameters are proposed and analyzed. Based on these expansions, polynomial limit representations of weighted pseudoinverses are obtained. Issues related to the construction of direct and iterative methods for calculating weighted pseudoinverses and weighted normal pseudosolutions, as well as solving constrained least squares problems, are examined.
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Expansion of weighted pseudoinverse matrices with positive definite weights into Matrix Power products. Iterative methods
Cybernetics and Systems Analysis, 2007Co-Authors: I. V. Sergienko, E. F. Galba, V. S. DeinekaAbstract:Weighted pseudoinverse matrices with positive definite weights are expanded into Matrix Power products with negative exponents and arbitrary positive parameters. These expansions are used to develop and analyze iterative methods for evaluating weighted pseudoinverse matrices and weighted normal pseudosolutions and solving constrained least-squares problems.
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Expansion of weighted pseudoinverse matrices with singular weights into Matrix Power products and iteration methods
Ukrainian Mathematical Journal, 2007Co-Authors: I. V. Sergienko, E. F. Galba, V. S. DeinekaAbstract:We obtain expansions of weighted pseudoinverse matrices with singular weights into Matrix Power products with negative exponents and arbitrary positive parameters. We show that the rate of convergence of these expansions depends on a parameter. On the basis of the proposed expansions, we construct and investigate iteration methods with quadratic rate of convergence for the calculation of weighted pseudoinverse matrices and weighted normal pseudosolutions. Iteration methods for the calculation of weighted normal pseudosolutions are adapted to the solution of least-squares problems with constraints.