Preparing the books to read every day is enjoyable for many people. However, there are still many people who also don't like reading. This is a problem. But, when you can support others to start reading, it will be better. One of the books that can be recommended for new readers is computer aided analysis of electronic circuits algorithms and computational techniques. This book is not kind of difficult book to read. It can be read and understand by the new readers.

Computer-aided analysis of electronic circuits: Algorithms and computational techniques

Tensor Analysis of Networks. By Gabriel Kron. Pp. xxix, 635. 70s. 1965. (Macdonald)

hysteresis in magnetism (electromagnetism)

One of the weakest components of modern transient simulation software is the transformer model. Many opportunities exist to improve the simulation of its complicated behaviors, which include magnetic saturation of the core, frequency-dependency, capacitive coupling, and topologically correctness of core and coil structure. This paper presents a review of transformer models for simulation of low- and mid-frequency transients. Salient points of key references are presented and discussed in order to give an accessible overview of development, implementation and limitations of the most useful models proposed to date. Techniques for representation of the most important behaviors are examined, with the intent of providing the needed foundation for continued development and improvement of transformer models.

Transformer modeling for low- and mid-frequency transients - a review

A computer-oriented method for the time-domain analysis of networks with internally controlled ideal switches is presented No assumptions are made about the continuity of the circuit response at the switching instants; even Dirac impulses are permitted In fact, it is shown that Dirac impulses must be considered for the analysis of some switched networks, even though they may only be present for intermediate steps of the analysis Several topological changes may be needed at each switching instant to ensure that the topology after switching is valid The theories have been implemented in a computer program, SWANN The network equations are generated with a two-graph modified nodal analysis technique, rather than the state equation formulation Various internally controlled switches are permitted, such as the ideal diode, thyristor, and voltage- and current-controlled switches Numerical results show the generality and accuracy of the method on three switched networks >

Time-domain analysis of networks with internally controlled switches

Geometric algebra is used in this paper for a rigorous mathematical treatment of power in single-phase circuits under nonsinusoidal conditions, as complex algebra for sinusoidal conditions. This framework clearly displays the multidimensional nature of power, which is represented by a multivector. The power multivector with its three attributes (magnitude, direction and sense) provides the means to encode all the necessary information in a single entity. This property, in conjunction with the fact that there is a one-to-one correspondence between the terms of this multivector, the instantaneous and the apparent power equation, distinguishes it as a highly efficient mathematical tool. In this way one can successfully describe power phenomena and handle practical problems (e.g., power factor improvement). Two simple examples show some of these features. In short, the power multivector under nonsinusoidal situations can be perceived as the generalization of the complex power under sinusoidal situations

Geometric Algebra: A Powerful Tool for Representing Power Under Nonsinusoidal Conditions

In this paper, a three-phase transformer model is developed to be suitable for slow transient and power-quality studies. The proposed model takes into account the eddy currents, the magnetic core topology, and the nonlinear characteristics of the core material. In order to model the eddy currents effects in the magnetic core, Bertotti's work for the eddy currents is used and nonlinear resistors dependent on the magnetic core topology are proposed. A systematic procedure is developed for the determination of the incremental self and mutual inductances of the windings. The nonlinear characteristics of the core material are represented either by a magnetization curve or by a hysteresis loop. The hysteresis loop is introduced either by the mathematical model proposed by Tellinen or by the macroscopic model presented by Jiles-Atherton. Simulations results are compared to published measurements in order to verify the proposed model.

Three-Phase Transformer Model Including Magnetic Hysteresis and Eddy Currents Effects

Harmonic distortion assessment for a single-phase grid-connected photovoltaic system

In this paper, a single-phase core-type and shell-type transformer model is proposed on the level of state equations. The magnetic hysteresis and the eddy currents effects are successfully included based on the analytical description of the magnetic core topology. Predicted values from simulations are in very good agreement with published measurements and hence, the developed transformer model is a powerful tool for transient and steady-state studies.

Single-phase transformer model including magnetic hysteresis and eddy currents

An incremental transformer model suitable for slow transient studies was developed. A typical application is the study of temporary harmonic overvoltages in AC/DC systems caused by transformer saturation. The proposed model represents the nonlinear magnetic circuit of the transformer and is, therefore, more complex that the piecewise-linear models often used to simulate saturation. Despite its complexity, the model formulation is suitable for direct solution at each integration step and this results in reasonable simulation time. The proposed model is particularly suitable for HVDC system studies since only a few elements of the transformer matrix need to be updated at each switching instant to account for the switching action of the converter valves. A study of temporary overvoltages in a weak AC/DC system is presented. Two types of disturbances leading to temporary harmonic overvoltages are simulated using both the piecewise-linear and the proposed incremental transformer model. Comparison of the simulation results indicates that the proposed model can be successfully used for the validation of temporary overvoltage studies conducted with simpler and faster transformer models. >

John Milias-Argitis

Papers

Geometric Algebra: A Powerful Tool for Representing Power Under Nonsinusoidal Conditions

Three-Phase Transformer Model Including Magnetic Hysteresis and Eddy Currents Effects

Harmonic distortion assessment for a single-phase grid-connected photovoltaic system

Single-phase transformer model including magnetic hysteresis and eddy currents

An incremental transformer model for the study of harmonic overvoltages in weak AC/DC systems