Harmonic domain modeling of a distribution system using the DIg SILENT power …

The first part of this paper presents the comparison between two models of distribution system created in computer simulation software PowerFactory (PF). Model A is an existing simplified equivalent model of the distribution system used by transmission system operator (TSO) Eltra for balanced load-flow calculation and stability studies. Model B is accurate model of the distribution system creat…

Software predicts harmonic problem and simulates alternative solution

Many articles have been written about the growing harmonic problems in present day power systems. The topics range from the fundamentals of harmonics to specific case studies showing harmonic cause and effect relationships. The articles follow a common theme: they describe harmonic problems and recommend possible solutions after the problems occurs. This article describes how computer simulatio…

Impact study of prastical harmonic data using time series simulation

With the increasing proliferation of non-linear loads, more harmonics are expected to be injected into the distribution system. This paper presents time series simulations of harmonic analysis in the distribution system. Modeling and analysis approach is used to perform the time series of harmonic analysis. OpenDSS, an open-source distribution system simulator is utilized in order to perform th…

Harmonic suppression and simulation based on matlab

An active power filter (APF)based on digital signal processor (DSP) and complicated programming logic component (CPLD) is designed in this paper. Solft and hard wares are introduced and the simulation experiment to compensate the reactive power and harmonics in three-phase four-wires system is done. By using Matlab. simulation model is build for the device. The result shows that this model can …

Realibility of lumped parameter modeling of pressure changes in geothermal re…

Edisi

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Deskripsi Fisik

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Judul Seri

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No. Panggil

620 AXE r

Numerical modeling of transient basin and range extensional geothermal systems

A suite of models utilizing a simplified structural framework with a range of bulk rock permeabilities were developed to analyze the transient behavior of Basin and Range extensional geothermal systems, and particularly, the evolution of the system temperature with time. Each model consists of two mountain ranges (∼1 km relief from the valley floor) separated by a thick sequence (about 4 km) …

Enhanced geothermal systems (EGS) using CO2 as working fluid-a novel approach…

Responding to the need to reduce atmospheric emissions of carbon dioxide, Brown [Brown, D., 2000. A Hot Dry Rock geothermal energy concept utilizing supercritical CO2 instead of water. In: Proceedings of the Twenty-Fifth Workshop on Geothermal Reservoir Engineering, Stanford University, pp. 233–238] proposed a novel enhanced geothermal systems (EGS) concept that would use carbon dioxide (CO2)…

Simple and advanced methods for calculating six-pulse diode rectifier line-si…

This paper proposes different methods for estimation of the harmonic currents of the six-pulse diode rectifier, which is a very commonly used topology in industry. Both simple and advanced models are compared and the models are put into a context of practical use for calculating the harmonic distortion in a typical industrial application. Finally, the different models are compared to measuremen…

Harmonic modeling and simulation requirements for the revised IEEE standard 5…

Abstract: As IEEE Standard 519-1992 enters its final revision stages for a new release, it is becoming clear that new and improved modeling and simulation techniques are required to address various technologies and control systems that were not considered in the 1992 version. Probably the single largest issue is the emergence of "active rectifier" AC-DC converters. However, other modeling and …

Test systems for harmonics modeling and simulation

This paper presents three harmonic simulation test systems. The purpose is to demonstrate guidelines for the preparation and analysis of harmonic problems through case studies and simulation examples. The systems can also be used as benchmark systems for the development of new harmonic simulation methods and for the evaluation of existing harmonic analysis software.