Analysis Of Power Electronic Circuits Research Articles

Gyrator-capacitor based modelling and simulation of forward converter

PurposeThis paper aims to propose an efficient model for analysis of power electronic circuits with integrated magnetic components.Design/methodology/approachThe inductance modeling technique is used as the traditional method for analyzing magnetic components. This model is simple and enough to generate for individual components, that is, an inductor and a transformer. However, it becomes difficult to realize this model for the integrated magnetic structures. This paper shows an appropriate model for individual magnetic components as well as integrated magnetic components and its application to magnetically coupled DC–DC converters. Gyrator–capacitor (G–C) modeling offers a unified, reasonable way of understanding the magnetic components commonly met with in power electronics and the other disciplines.FindingsG–C model allows any electrical and magnetic circuit to be simultaneously simulated with circuit simulators. In this regard, this paper gives a complete simulation model and analysis as an illustrative example. There is no limitation of this paper or future works. The proposed G–C model can be applied to all power electronic circuits having integrated magnetic components.Originality/valueIn the proposed model, the magnetic circuit is converted to a pure electric circuit with capacitors and controlled sources; every winding is replaced with a pair of current controlled voltage sources, namely, a gyrator.

A wavelet‐based piecewise approach for steady‐state analysis of power electronics circuits

AbstractSimulation of steady‐state waveforms is important to the design of power electronics circuits, as it reveals the maximum voltage and current stresses being imposed upon specific devices and components. This paper proposes an improved approach to finding steady‐state waveforms of power electronics circuits based on wavelet approximation. The proposed method exploits the time‐domain piecewise property of power electronics circuits in order to improve the accuracy and computational efficiency. Instead of applying one wavelet approximation to the whole period, several wavelet approximations are applied in a piecewise manner to fit the entire waveform. This wavelet‐based piecewise approximation approach can provide very accurate and efficient solution, with much less number of wavelet terms, for approximating steady‐state waveforms of power electronics circuits. Copyright © 2006 John Wiley & Sons, Ltd.

A wavelet approach to fast approximation of steady‐state waveforms of power electronics circuits

AbstractWaveforms arising from power electronics circuits often contain slowly changing segments with high‐frequency details concentrated near the switching instants. Such a feature is consistent with the localization property of wavelets which are known in the signal processing literature to be highly suitable for describing fast changing edges embedded in slowly varying backgrounds. This paper considers the application of wavelet approximation to the steady‐state analysis of power electronics circuits. The basic procedure of wavelet approximation is reviewed, and an improved approach by mixing wavelets of different levels is described. When applied to power electronics circuits, the method yields efficient solutions because only a relatively small number of wavelets are needed and the proposed algorithm involves only matrix operations, permitting the steady‐state waveforms to be found fast. Copyright 2003 John Wiley & Sons, Ltd.

A dedicated simulation approach for the steady-state analysis of power electronic circuits

This paper describes SUPRA (Simulator for Unified Power Regulators Analysis), a new simulation tool for the behavior mode simulation of switchmode power supplies. This simulation tool uses the variable- topology simulation method (VTSM) in conjunctio

Computer-aided analysis of power electronic circuits by stepwise topological identification

A new approach for the time-domain simulation of power electronic circuits is developed. The methodology is based on stepwise identification of circuit topology. The simulation process automatically looks for a valid topology in every step. At each simulation instant, the circuit topology is transformed into a resistive network, giving another superior feature of this method: the avoidance of solving complicated s-domain or differential formulas. No small-signal approximation is assumed. Parasitic resistance of the reactive element is included in the circuit model. Several examples illustrating the generality and computational efficiency of this new method are presented. The simulated results are favourably verified with experimental measurements and available literature. © 1997 John Wiley & Sons, Ltd.

A variant for numerical simulation of a high-frequency converter with voltage-fed inverter

Abstract The paper presents significant aspects of analytical and numerical simulation of a high-frequency converter with voltage-fed inverter, framing in over 10 years preoccupations of the Electric Powers Laboratory from our Technical University. Here some constructive-functional aspects are highlighted and certain computed results are interpreted. The paper deals with the these days trend to use new methods in computer analysis of power electronic circuits and industrial equipments provided with static converters. Taking into account the complexity of electromagnetical phenomena arising in these cases, the preoccupation to elaborate new competitive numerical procedures for the study of the representative signals, in the assumption that the structure parameters and hence the functional conditions are changed, is justified. The paper treats the analytical simulation of a high-frequency voltage-fed inverter for induction heating by input-state-output relations. With a view to numerical simulation, the paper exposes in a summary form, a procedure of local-iterative linearization for the integration of ordinary differential equations and some cautions over the calculation start, according to the initial conditions. On the basis of a computing program, the output signals (load current and voltage) are plotted; some experimental results are also presented. The conclusions highlight the benefits of the method used, representing a first stage in the design of these converters with the aim to frame them in advanced control systems.

Finite element analysis for power electronics EMC applications

A CAD system for the analysis of power electronic circuits for EMC applications is being developed. The system is based on 3-dimensional finite-element electromagnetic field computations, with the source currents or voltages extracted either from measurements or from standard circuit analysis. The finite-element solver for this application is configured in terms of magnetic vector potential (A_) and modified electric scalar potential (V'), incorporating, unusually, the Coulomb gauge /spl nabla/.A_=0. Comparisons of computed electromagnetic fields with measurements of fields emitted from a 600 V, 300 A IGBT switching circuit are reported. Agreement in magnetic field strength is fair (within 8 dB/spl mu/A/m) at the low frequencies (10 kHz-20 kHz) considered.

MODELING AND SIMULATION OF CONVERTER SYSTEMS PART II: SIMULATION PACKAGE TCAD

The methods, models and techniques — presented in the companion paper — have been used as a basis for the evaluation of popular general-purpose electrical circuit simulation programs, in particular, their applicability in the analysis of power electronic circuits. As a result of this critical evaluation, the general requirements for the simulation program adequate for converter systems studies and design have been formulated. On this basis the algorithm of TCAD — a general-purpose converter system simulation program — has been elaborated. In presentation of the TCAD program three parties have been distinguished: the first one emphasizes the applications of modern simulation methods for converter systems, the second describes briefly the features of the main modules of the TCAD package, and the third presents some simulation examples of practical converter systems. Three simulation examples are presented: two resonant converters and an induction motor drive fed by a full-bridge voltage source PWM inverter at normal and fault operation conditions. A good agreement between simulation and experimental results has proved that this simulation package is a power tool for research, teaching and engineering practice.

New approach to switch modelling in the analysis of power electronic systems

A new and efficient approach for the analysis of power electronic circuits using the modified nodal formulation of circuit equations is presented. The method is well suited for the development of dedicated simulation software for power electronic systems. Semiconductor switches are modelled as binary inductors, as a very low value of inductance (determined by the rating of the semiconductor) during conduction, and infinite value of inductance otherwise. The system matrix is partitioned in such a manner as to permit efficient handling of switch status. The method can be easily adapted to incorporate control circuits and machine representations. The backward Euler method of integration is used for the solution of equations to ensure convergence. Examples of regulator and inverter circuits are solved using the new approach and results are included.

Time domain circuit analysis

The program Power Electronic Circuit Analysis (PECAN), which has been made to handle some power engineering applications not suited for SPICE or EMTP, is discussed. Time functions of voltages, currents, torque, angular speed, power, and other derived quantities can be calculated and plotted on the screen a printer, or a plotter. The calculations are performed stepwise for a series of points in times, with a variable step size selected by the program within specified limits. Control functions can be converted to equivalent electrical circuits and can be included or studied separately. The program runs under MS-DOS on a personal computer with at least 640 kbytes of memory and a math coprocessor. Input files are provided with the program for many typical problems in power electronics, machine analysis, and others. The program can handle circuits with up to 300 components and 200 variables (nodes plus branches). Examples presented include pulse width modulation (PWM), three-phase diode bridge, symmetrical three-phase short circuit of synchronous generator, and transient temperatures on cables.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

User-friendly dedicated power electronic converter simulator

A user-friendly power electronic simulator for the design and analysis of power electronic circuits is presented. A graphic input interface module called ATOSECG has been developed for the dedicated power electronic converter system simulator ATOSEC5. ATOSECG has tremendously facilitated the interaction of the user with the simulator. Examples of application of the ATOSEC5 simulator for the analysis of a complex multiconverter system are given.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Analysis of power electronic circuits with feedback control: a general approach

An algorithm that is suitable for the development of general purpose simulation software for power electronic circuits is presented. The circuits can be arbitrarily configured and can incorporate feedback controls. The method of analysis uses an efficient nodal approach that allows the device switchings to be easily monitored. The basic nodal formulation, including the method used to monitor device switching, is discussed. The method used to efficiently formulate the nodal equations for the power and control circuits is described. Several examples that illustrate the main features of the method are presented.

Power Electronic Circuit Analysis Techniques

A number of methods of analyzing power electronic circuits are discussed and illustrated. Each of these methods has unique advantages and disadvantages. No one method appears to have all of the features necessary for it to become the preferable analysis approach. Thus, the search must continue for the ultimate power electronic circuit analysis technique.

Voltage variation in radio frequency induction heating

The paper presents significant aspects of analytical and numerical simulation of a high-frequency converter with voltage-fed inverter, framing in over 10 years preoccupations of the Electric Powers Laboratory from our Technical University. Here some constructive-functional aspects are highlighted and certain computed results are interpreted.The paper deals with the these days trend to use new methods in computer analysis of power electronic circuits and industrial equipments provided with static converters. Taking into account the complexity of electromagnetical phenomena arising in these cases, the preoccupation to elaborate new competitive numerical procedures for the study of the representative signals, in the assumption that the structure parameters and hence the functional conditions are changed, is justified.The paper treats the analytical simulation of a high-frequency voltage-fed inverter for induction heating by input-state-output relations. With a view to numerical simulation, the paper exposes in a summary form, a procedure of local-iterative linearization for the integration of ordinary differential equations and some cautions over the calculation start, according to the initial conditions.On the basis of a computing program, the output signals (load current and voltage) are plotted; some experimental results are also presented. The conclusions highlight the benefits of the method used, representing a first stage in the design of these converters with the aim to frame them in advanced control systems.