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The paper deals with behavior of Czech traction power supply system of AC 25 kV. The main goal of this paper is analysis of transient effects during operation of traction vehicles in various modes which can arise during short-circuits in traction system. The protection settings have to be done for all possible states in traction system including identification of short-circuits in the case of recuperation...
This paper proposes a comparison among FEA field models combined with analytical model, in order to predict with better accuracy the NEMA/IEC performance indicators. Such indicators are the locked-rotor current, efficiency, breakdown torque and locked-rotor torque. The Stationary (S), Time-Harmonic (TH) and Time-Stepping (TS) models have been compared with different simulation features, such as: linear...
In this paper the methods of integral differential-difference recognition of signals and square-pulse transformation of harmonic signals for detecting transients in power systems are described. The object of this work is the theory of signal processing disturbances in power lines when a leaps and short circuits occur.
With the ever increasing complexity of the high speed digital and analog design both time and frequency analyses are to be considered. The present paper presents a brief overview on linear and nonlinear simulations type and evaluation of the effects of choosing transient or harmonic balance in evaluation of interconnections on a printed circuit board by using eye diagram tool.
In this paper a method for the control of the stability of nonlinear circuits under large-signal conditions, including an analysis of the transient regime, is presented. It is based on the calculation of the conversion matrix, computed both from standard harmonic balance at steady-state large-signal regime and from a transient envelope simulation. This allows the direct design of the passive networks...
An envelope method of RFIC simulation is mainly discussed in the paper. In the method, the slowly varying envelope components are for transient analysis of SPICE. On each time point of the transient analysis, fast pulse response is calculated by the harmonic balance method, and relatively insensitive to the rate of the high frequency carrier. The method could be used to efficiently simulate the transient...
This paper is the first of a series of publications detailing the development an AI-based adaptive autoreclosing algorithm. In part 1, a detailed model of the Scottish 132kV Network has been constructed on a real time digital simulator. The system model is discussed, including the network topology, line and source modelling and the DFIG-based wind farm model. An initial investigation on penetration...
This paper presents a new circuit model of SSSC based on state equations in three-wired systems. SSSC is a series compensator of FACTS family. It injects an almost sinusoidal voltage with variable amplitude and is equivalent to an inductive or a capacitive reactance in series with the transmission line. The analysis of a power electronics system is complex, owing to its switching behavior. Since such...
This paper presents a solution to one of the most troublesome sections of Newton algorithm for solving harmonic balance nonlinear system of equations which is choosing an appropriate initial condition. A good initial condition guaranties the convergence of the algorithm. Here, we have used Volterra series analysis to calculate the appropriate initial condition for the harmonic balance analysis. To...
This paper presents a methodology for steady-state and transient analysis in electrical networks, the methodology is applied to reactive power compensation using thyristor-controlled reactor with fixed capacitor (TCR-FC). The method is based on the use of dynamic harmonic domain (DHD) and associated discrete circuit models. The dynamic harmonic domain is a natural approach for conducting dynamic and...
To correctly apply transformer differential protection in the environment of UHV (ultra high voltage), it is necessary to model the UHV power transformer reasonably and carry out corresponding electromagnetic transient simulations. Therefore, according to the equivalent circuit of three winding auto-transformer, we firstly set up the three winding autotransformer model by means of UMEC (Unified Magnetic...
This paper presents a solution to one of the most troublesome sections of Newton algorithm for solving harmonic balance nonlinear system of equations which is choosing an appropriate initial condition. A good initial condition guaranties the convergence of the algorithm. Here, we have used Volterra series analysis to calculate the appropriate initial condition for the harmonic balance analysis. To...
This paper discusses the design of a 60 GHz low noise amplifier (LNA) using a standard low power SOI CMOS process from ST Microelectronics. First, we outline the technology as well as the mm-wave design challenges. Using recent work on coplanar waveguide (CPW) modeling, we describe how it's possible to use parametric, 3D electromagnetic simulation to complete or replace analytical models of on-chip...
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
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