The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform

Mario Paolone - One of the best experts on this subject based on the ideXlab platform.

  • On the Properties of the Power Systems Nodal Admittance Matrix
    IEEE Transactions on Power Systems, 2018
    Co-Authors: Andreas Martin Kettner, Mario Paolone
    Abstract:

    This letter provides conditions determining the rank of the Nodal Admittance Matrix, and arbitrary block partitions of it, for connected AC power networks with complex Admittances. Furthermore, some implications of these properties concerning Kron reduction and hybrid network parameters are outlined.

  • On the Properties of the Compound Nodal Admittance Matrix of Polyphase Power Systems
    IEEE Transactions on Power Systems, 2017
    Co-Authors: Andreas Martin Kettner, Mario Paolone
    Abstract:

    Most techniques for power system analysis model the grid by exact electrical circuits. For instance, in power flow study, state estimation, and voltage stability assessment, the use of Admittance parameters (i.e., the Nodal Admittance Matrix) and hybrid parameters is common. Moreover, network reduction techniques (e.g., Kron reduction) are often applied to decrease the size of large grid models (i.e., with hundreds or thousands of state variables), thereby alleviating the computational burden. However, researchers normally disregard the fact that the applicability of these methods is not generally guaranteed. In reality, the Nodal Admittance must satisfy certain properties in order for hybrid parameters to exist and Kron reduction to be feasible. Recently, this problem was solved for particular cases of monophase and balanced triphase grids. This paper investigates the general case of unbalanced polyphase grids. First, conditions determining the rank of the so-called compound Nodal Admittance Matrix and its diagonal subblocks are deduced from the characteristics of the electrical components and the network graph. Second, the implications of these findings concerning the feasibility of Kron reduction and the existence of hybrid parameters are discussed. In this regard, this paper provides a rigorous theoretical foundation for various applications in power system analysis.

  • a method for the assessment of the optimal parameter of discrete time switch model
    Electric Power Systems Research, 2014
    Co-Authors: Reza Razzaghi, Mario Paolone, Chrysa Foti, F Rachidi
    Abstract:

    This paper proposes a novel method for the optimal parameter selection of the discrete-time switch model used in circuit solvers that adopt the fixed Admittance Matrix Nodal method (FAMNM) approach. As known, FAMNM-based circuit solvers allow to reach efficient computation times, in particular for real-time simulation applications, since they do not need the inversion of the circuit Nodal Admittance Matrix. However, these solvers need to optimally tune the so-called discrete switch conductance, since this parameter might largely affect the simulations accuracy. Within this context, we propose a method for the determination of the discrete-time switch conductance which is obtained by minimizing the distance between the eigenvalues of the original circuit's Nodal Admittance Matrix with those associated with the circuit including the discrete-time switches. The method is proven to provide values of the discrete-time switch conductance that maximize the simulation accuracy and minimize the losses on this artificially introduced parameter. Additionally, the proposed method avoids the use of trial-and-error process typically required when discrete-time switch conductances need to be addressed in FAMNM approach. The performances of the proposed method are demonstrated for circuits with single and multiple switches in which passive RLC elements and transmission lines are both considered.

  • Numerical simulation of power systems for real-time simulation applications
    2014
    Co-Authors: Marc Mitjans, Mario Paolone, Reza Razzaghi
    Abstract:

    Distributed Electrical Systems Laboratory Engineering in Industrial Technologies Numerical simulation of power systems for real-time simulation applications by Marc Mitjans This report concerns to the study of FPGA-based electromagnetic transient simulations of power systems. Along its content, the discretization of electric circuits concerning power systems will be treated for RLC circuits and transmission lines. Our goal is to be able to define a program that, by reading a text file with the information of a certain network, computes the Nodal Admittance Matrix for the Fixed Admittance Matrix Nodal Method. Several examples will be shown with the comparison between the values obtained from the EMTP-RV simulator software and the ones obtained from our solver in order to validate the model. Finally, the Nodal Admittance Matrix (NAM) will be used in the code programmed for the CompactRIO and its FPGA for real-time simulations.

  • a novel method for the optimal parameter selection of discrete time switch model
    Proceedings of the 10th International Conference on Power Systems Transients (IPST 2013), 2013
    Co-Authors: Reza Razzaghi, Mario Paolone, Chrysanthi Foti, F Rachidi
    Abstract:

    The paper proposes a novel method for the optimal parameter selection of the discrete-time switch model used in circuit solvers that adopt the Fixed Admittance Matrix Nodal Method (FAMNM) approach. As known, FAMNM-based circuit solvers allow to reach efficient computation times since they do not need the inversion of the circuit Nodal Admittance Matrix. However, these solvers need to optimally tune the so-called discrete switch conductance, since this parameter might largely affect the simulations accuracy. Within this context, the method proposed in the paper minimizes the distance between the eigenvalues of the original circuit’s Nodal Admittance Matrix with those associated with the presence of the discrete-time switches. The method is proven to provide values of the discrete-time switch conductance that maximize the simulation accuracy and minimize the losses on this artificial parameter. The performances of the proposed method are finally validated by making reference to two test cases: (i) a circuit composed of RLC elements, (ii) a network model that includes a single-phase transmission line.

Ahmed M. Soliman - One of the best experts on this subject based on the ideXlab platform.

  • GENERATION OF THIRD-ORDER QUADRATURE OSCILLATOR CIRCUITS USING NAM EXPANSION
    Journal of Circuits Systems and Computers, 2013
    Co-Authors: Ahmed M. Soliman
    Abstract:

    A systematic synthesis procedure for generating third-order grounded passive element quadrature oscillators is given. The synthesis procedure is based on using Nodal Admittance Matrix (NAM) expansion applied to the Y Matrix of a recently reported three Op Amp third-order oscillator circuit. Four new circuits using current conveyors (CCII) are reported. In addition four more new circuits using inverting current conveyors (ICCII) are also given. Many more quadrature third-order oscillator circuits using combinations of CCII and ICCII can be obtained. Simulation results demonstrating the practicality of one of the generated circuits are included.

  • Synthesis of Generalized Impedance Converter and Inverter Circuits Using NAM Expansion
    Analog RF and Mixed-Signal Circuit Systematic Design, 2013
    Co-Authors: Ahmed M. Soliman
    Abstract:

    The generalized impedance converter (GIC) is an active two port network in which the input impedance is equal to the load impedance times a conversion function of the complex frequency variable .There are two types of the GIC, the first is the voltage generalized impedance converter (VGIC) and the second is the current generalized impedance converter (CGIC). In this chapter the Nodal Admittance Matrix (NAM) expansion is used to generate all possible VGIC and CGIC circuits. The realizations of two types of the generalized impedance inverter (GII) circuits using NAM expansion are also given.

  • A Note on the Generation of Generalized Impedance Converter Circuits Using NAM Expansion
    Circuits Systems and Signal Processing, 2012
    Co-Authors: Ahmed M. Soliman
    Abstract:

    The Nodal Admittance Matrix (NAM) expansion is used to generate the voltage generalized impedance converter (VGIC) and the current generalized impedance converter (CGIC) with both A and D of the transmission Matrix ( T ) being negative. Simulation results are included.

  • Generation of Generalized Impedance Converter Circuits Using NAM Expansion
    Circuits Systems and Signal Processing, 2011
    Co-Authors: Ahmed M. Soliman
    Abstract:

    The generation of the voltage generalized impedance converter (VGIC) circuits using a Nodal Admittance Matrix (NAM) expansion is given in detail. Thirty-two equivalent circuits using current conveyors (CCII) or inverting current conveyors (ICCII) or a combination of both are generated. The reported circuits are suitable for realizing inductors or frequency dependent negative resistors (FDNR) using grounded passive elements. Similarly the generation of the current generalized impedance converter (CGIC) circuits published recently is reexamined and this resulted in 16 more new CGIC circuits using an alternative NAM expansion. Modification of two of the generated circuits to realize a floating inductor or floating FDNR is also given together with Spice simulation results.

  • generation of kerwin huelsman newcomb biquad filter circuits using Nodal Admittance Matrix expansion
    International Journal of Circuit Theory and Applications, 2011
    Co-Authors: Ahmed M. Soliman
    Abstract:

    Nodal Admittance Matrix (NAM) expansion is used to generate a family of grounded passive component Kerwin Huelsman Newcomb (KHN) circuits. The generated KHN circuits have independent control on the selectivity factor and the radian frequency as in the original KHN, besides they have independent control on the gain, which is not achievable in the original KHN circuit. The NAM expansion is based on using nullor elements and voltage mirror and current mirror as well. Two types of the KHN circuit are considered, each includes four classes. For each class it is found that there are 32 different KHN circuit; therefore, there is a total of 128 circuits that belong to type-A KHN and a similar number for type-B KHN circuits. Simulation results are included to support the generation method. Copyright © 2010 John Wiley & Sons, Ltd.

P M Radmore - One of the best experts on this subject based on the ideXlab platform.

  • symbolic passive rc circuit synthesis by Admittance Matrix expansion
    International Symposium on Circuits and Systems, 2005
    Co-Authors: D G Haigh, P M Radmore
    Abstract:

    Active-RC circuits with prescribed voltage or current transfer functions are synthesised, starting with the transfer function in symbolic form and making no assumptions about circuit topology. The approach is based on a method of Admittance Matrix expansion proposed for passive-RC circuits (Haigh, D.G., ibid., p.244-7). The approach relies on the use of linked infinity parameters to describe both nullors in the Nodal Admittance Matrix of a synthesised circuit and port Admittance matrices exhibiting the prescribed voltage or current transfer functions.

  • ISCAS (1) - Symbolic passive-RC circuit synthesis by Admittance Matrix expansion
    2005 IEEE International Symposium on Circuits and Systems, 2005
    Co-Authors: D G Haigh, P M Radmore
    Abstract:

    Active-RC circuits with prescribed voltage or current transfer functions are synthesised, starting with the transfer function in symbolic form and making no assumptions about circuit topology. The approach is based on a method of Admittance Matrix expansion proposed for passive-RC circuits (Haigh, D.G., ibid., p.244-7). The approach relies on the use of linked infinity parameters to describe both nullors in the Nodal Admittance Matrix of a synthesised circuit and port Admittance matrices exhibiting the prescribed voltage or current transfer functions.

D G Haigh - One of the best experts on this subject based on the ideXlab platform.

  • Systematic Synthesis of Active-RC Circuit Building-Blocks
    Analog Integrated Circuits and Signal Processing, 2005
    Co-Authors: D G Haigh, F. Q. Tan, C. Papavassiliou
    Abstract:

    In this paper, we show how some basic building blocks for active-RC circuit design, such as amplifiers, impedance converters and simulated inductance circuits, may be synthesised in a systematic way by expansion of their port Admittance matrices. The circuit topology emerges from the synthesis procedure, allowing all possible implementations to be identified and explored. Nullors representing ideal op-amps and transistors are represented within the Nodal Admittance Matrix of a synthesised circuit by linked infinity parameters. In Nodal Admittance matrices describing ideal circuits synthesised, the replacement of linked infinity parameters by finite parameters provides a seamless transition to non-ideal analysis and practical circuit design.

  • symbolic passive rc circuit synthesis by Admittance Matrix expansion
    International Symposium on Circuits and Systems, 2005
    Co-Authors: D G Haigh, P M Radmore
    Abstract:

    Active-RC circuits with prescribed voltage or current transfer functions are synthesised, starting with the transfer function in symbolic form and making no assumptions about circuit topology. The approach is based on a method of Admittance Matrix expansion proposed for passive-RC circuits (Haigh, D.G., ibid., p.244-7). The approach relies on the use of linked infinity parameters to describe both nullors in the Nodal Admittance Matrix of a synthesised circuit and port Admittance matrices exhibiting the prescribed voltage or current transfer functions.

  • ISCAS (1) - Symbolic passive-RC circuit synthesis by Admittance Matrix expansion
    2005 IEEE International Symposium on Circuits and Systems, 2005
    Co-Authors: D G Haigh, P M Radmore
    Abstract:

    Active-RC circuits with prescribed voltage or current transfer functions are synthesised, starting with the transfer function in symbolic form and making no assumptions about circuit topology. The approach is based on a method of Admittance Matrix expansion proposed for passive-RC circuits (Haigh, D.G., ibid., p.244-7). The approach relies on the use of linked infinity parameters to describe both nullors in the Nodal Admittance Matrix of a synthesised circuit and port Admittance matrices exhibiting the prescribed voltage or current transfer functions.

Andreas Martin Kettner - One of the best experts on this subject based on the ideXlab platform.

  • On the Properties of the Power Systems Nodal Admittance Matrix
    IEEE Transactions on Power Systems, 2018
    Co-Authors: Andreas Martin Kettner, Mario Paolone
    Abstract:

    This letter provides conditions determining the rank of the Nodal Admittance Matrix, and arbitrary block partitions of it, for connected AC power networks with complex Admittances. Furthermore, some implications of these properties concerning Kron reduction and hybrid network parameters are outlined.

  • On the Properties of the Compound Nodal Admittance Matrix of Polyphase Power Systems
    IEEE Transactions on Power Systems, 2017
    Co-Authors: Andreas Martin Kettner, Mario Paolone
    Abstract:

    Most techniques for power system analysis model the grid by exact electrical circuits. For instance, in power flow study, state estimation, and voltage stability assessment, the use of Admittance parameters (i.e., the Nodal Admittance Matrix) and hybrid parameters is common. Moreover, network reduction techniques (e.g., Kron reduction) are often applied to decrease the size of large grid models (i.e., with hundreds or thousands of state variables), thereby alleviating the computational burden. However, researchers normally disregard the fact that the applicability of these methods is not generally guaranteed. In reality, the Nodal Admittance must satisfy certain properties in order for hybrid parameters to exist and Kron reduction to be feasible. Recently, this problem was solved for particular cases of monophase and balanced triphase grids. This paper investigates the general case of unbalanced polyphase grids. First, conditions determining the rank of the so-called compound Nodal Admittance Matrix and its diagonal subblocks are deduced from the characteristics of the electrical components and the network graph. Second, the implications of these findings concerning the feasibility of Kron reduction and the existence of hybrid parameters are discussed. In this regard, this paper provides a rigorous theoretical foundation for various applications in power system analysis.