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Oliver Chiver - One of the best experts on this subject based on the ideXlab platform.

  • symbolic Equation for linear analog electrical circuits using matlab
    WSEAS Transactions on Circuits and Systems archive, 2010
    Co-Authors: Zoltan Erdei, Luiza Alexandra Dicso, Liviu Neamt, Oliver Chiver
    Abstract:

    In this paper is presented a program which generates the modified Nodal Equation for electric analog circuits in a symbolic, partial symbolic and numerical mode. The program is an application, made in the environment of the program MATLAB version 7.1, which has a powerful symbolic math toolbox. MATLAB is a high-performance software package dedicated for numerical analysis and graphic representations in engineering applications. In this paper we try to explore the capabilities of this program in symbolic domain.

Zheng Yuan - One of the best experts on this subject based on the ideXlab platform.

  • a general unified ac dc power flow algorithm with mtdc
    IEEE Transactions on Power Systems, 2017
    Co-Authors: Jingting Lei, Zheng Yuan
    Abstract:

    The aim of this paper is to derive a general AC/DC power flow model with Voltage Source Converter Multi-Terminal High-Voltage Direct Current Systems (VSC MTDCs). The Equations of AC, DC grids, and VSCs are formulated in augmented rectangular coordinates. The proposed model is composed of two Nodal Equations and two power constraints for each AC bus, as well as one Nodal Equation and one power constraint for each DC bus. In this model, the VSC Equations are included in the AC and DC grid model—its power balance Equation and one of the control Equations are regarded as the power constraints of the AC bus connected to it, whereas the other control Equation is regarded as the power constraint of the DC bus connected to it. Therefore, the number of Equations of the proposed model is determined only by that of AC and DC buses, and the model is systematically well organized; the variety of VSC control strategies and AC/DC linking configurations does not influence the overall structure. The proposed approach enables to solve the load flow of the most general AC/MTDC, consisting of multiple AC and DC grids connected by VSCs, and is suitable for control strategies including the droop control and any new ones in the future. The model also leads to higher computational efficiency. By demonstrations on AC/DC power systems with several VSCs, this method is proved to be effective, flexible, and efficient.

Ser Gi Hong - One of the best experts on this subject based on the ideXlab platform.

  • mathematical adjoint solution to analytic function expansion Nodal afen method
    Nuclear Engineering and Technology, 1995
    Co-Authors: Ser Gi Hong
    Abstract:

    The mathematical adjoint solution of the Analytic Function Expansion (AFEN) method is found by solving the transposed matrix Equation of AFEN Nodal Equation with only minor modification to the forward solution code AFEN. The perturbation calculations are then performed to estimate the change of reactivity by using the mathematical adjoint The adjoint calculational scheme in this study does not require the knowledge of the physical adjoint or the eigenvalue of the forward Equation. Using the adjoint solutions, the exact and first-order perturbation calculations are peformed for the well-known benchmark problems (i.e., IAEA-2D benchmark problem and EPRI-9R benchmark problem). The results show that the mathematical adjoint flux calculated in the code is the correct adjoint solution of the AFEN method.

Zoltan Erdei - One of the best experts on this subject based on the ideXlab platform.

  • symbolic Equation for linear analog electrical circuits using matlab
    WSEAS Transactions on Circuits and Systems archive, 2010
    Co-Authors: Zoltan Erdei, Luiza Alexandra Dicso, Liviu Neamt, Oliver Chiver
    Abstract:

    In this paper is presented a program which generates the modified Nodal Equation for electric analog circuits in a symbolic, partial symbolic and numerical mode. The program is an application, made in the environment of the program MATLAB version 7.1, which has a powerful symbolic math toolbox. MATLAB is a high-performance software package dedicated for numerical analysis and graphic representations in engineering applications. In this paper we try to explore the capabilities of this program in symbolic domain.

Flavio Canavero - One of the best experts on this subject based on the ideXlab platform.

  • steady state analysis of switching power converters via augmented time invariant equivalents
    IEEE Transactions on Power Electronics, 2014
    Co-Authors: Riccardo Trinchero, Igor Simone Stievano, Flavio Canavero
    Abstract:

    This letter addresses the simulation of the steady- state response of switching power converters. The proposed approach is based on the interpretation of the voltage and current variables of a periodically switched linear circuit in terms of a series expansion and on the generation of augmented time- invariant constitutive relations of the circuit elements. The circuit solution is obtained from an augmented time-invariant Nodal Equation generated from topological information and circuit inspection only. The feasibility and strength of the approach are demonstrated on a DC-DC boost converter. I. INTRODUCTION Switched-mode power converters represent a class of well- known circuits massively used in a wide range of applications for supplying energy to electrical and electronic equipment and appliances. These circuits are inherently time-varying systems with a complex time-domain behavior characterized by the superposition of slow and fast dynamics, the latter arising from the internal periodic activity of the switching devices. The above features demand for the availability of effective simulation techniques for circuit analysis in the early design phase, with specific emphasis on the prediction of both the frequency- and time-domain behavior of the converter. Nu- merical simulation is used for the systematic assessment of possible alternative design scenarios and control strategies or the selection of the optimal filtering technique aimed at suppressing the unavoidable periodic disturbances feeding the power distribution system (see e.g., (1), (2), (3), (4)). In this framework, a number of techniques have already been developed and are currently available in the literature. Classical methods such as those based on state-space averaging or possible enhancements provide an effective solution that is widely adopted by designers (5), (6), (7), (8), (9), (10), (11). The aforementioned tools, provide a fast and effective simulation of the average response of the converters. To fully characterize the high-frequency behavior of circuit responses, further improvements or other techniques based on the general theory of periodically switched linear (PSL) circuits and systems can be used. Without loss of generality, the readers should refer to (12), (13), (14), (15) for a selection of state- of-the art contributions in this field. The above methods, that enhance the basic mathematical tool for the analysis of switching circuits or time-varying systems with periodic behavior, share the common limitation that the formulation and development are in general cumbersome. Hence, they demand for improvements aimed at lowering the technical barrier and facilitating the use of these methods for practical and realistic designs, with a large number of components, via a simple simulation strategy. Therefore, the aim of this paper is to provide a solution that reduces the mathematical complexity and allows to gen- erate a simulation stamp describing the circuit components, including the switches, by means of augmented time-invariant representations. As a result, the steady-state response of a PSL circuit is carried out via the standard solution of an augmented time-invariant Nodal Equation generated from circuit inspection only. As an additional benefit with respect to most of the state-of-the-art methods, the proposed technique handles an arbitrary number of switching devices within an automatic simulation flow and without introducing additional numerical overhead and complexity. The approach is illustrated and validated on a realistic switching power converter.