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Disturbance Analysis for Power Systems
* DFR records, oscillograms and numerical relay fault records are analyzed * Functional system diagrams showing monitored voltages and currents are provided * Provides real world case studies involving protection systems for generators, transformers, overhead transmission lines, etc.
eBook
Distributed Multi-Generation Systems
The recent development of distributed generation technologies is changing the focus of the production of electricity from large centralised power plants to local energy systems scattered over the territory. Under the distributed generation paradigm, the present research scenario emphasises more and more the role of solutions aimed at improving the energy generation efficiency and thus the sustainability of the overall energy sector. In particular, coupling local cogeneration systems to various typologies of chillers and heat pumps allows setting up distributed multi-generation systems for combined production of different energy vectors such as electricity, heat (at different enthalpy levels), cooling power, and so forth. The generation of the final demand energy outputs close to the users enables reducing the losses occurring in the energy chain conversion and distribution, as well as enhancing the overall generation efficiency. This book presents a comprehensive introduction to energy planning and performance assessment of energy systems within the so-called Distributed Multi-Generation (DMG) framework. Typical plant schemes and components are illustrated and modelled, with special focus on applications for trigeneration of electricity, heat and cooling power. A general approach to characterisation and planning of multi-generation systems is formulated in terms of the so-called lambda analysis, which extends the classical models related to the heat-to-power cogeneration ratio analysis in cogeneration plants. A unified theoretical framework leading to synthesise different performance assessment techniques is described in details. In particular, different indicators are presented for evaluating the potential energy benefits of distributed multi-generation systems with respect to classical case of separate production and centralised energy systems. Several case study applications are illustrated to exemplify the models presented and to point out some numerical aspects relevant to equipment available on the market. In particular, schemes with different cogeneration prime mover typologies, as well as electric, absorption and engine-driven chillers and heat pumps, are discussed and evaluated. A number of openings towards modelling and evaluation of environmental and economic issues are also provided. The aspects analysed highlight the prominent role of DMG systems towards the development of more sustainable energy scenarios.
eBook
RF and microwave coupled-line circuits
This extensively revised edition of the 1999 Artech House classic, RF and Microwave Coupled-Line Circuits, offers you a thoroughly up-to-date understanding of coupled line fundamentals, explaining their applications in designing microwave and millimeter-wave components used in todays communications, microwave, and radar systems. The Second Edition includes a wealth of new material, particularly relating to applications. You find brand new discussions on a novel simple design technique for multilayer coupled circuits, high pass filters using coupled lines, software packages used for filter design, design of elliptic response microstrip filters, and advanced filters using new materials and technologies.This unique book provides you with a thorough understanding of stripline, microstrip, monolithic, and coplanar technologies. Emphasizing design, analysis, and modern fabrication techniques and practices, it provides invaluable knowledge and guidance in helping you develop compact and low-cost design solutions and components such as loose and tight couplers, filters, hybrids, transformers, and baluns. Featuring more than 1100 equations, this comprehensive book serves as a consolidated resource of classic and cutting-edge information on coupled structures.
eBook
Coordination of Directional Overcurrent Relays Using the Backtracking Search Algorithm
The Directional Overcurrent Relays (DOCRs) coordination problem is of paramount importance for power system protection. This paper uses a new metaheuristic method called the Backtracking Search Algorithm (BSA) to solve the DOCRs coordination problem. The coordination problem has been formulated as an optimization problem to minimize the operating time of all the primary relays. The proposed algorithm has been implemented and applied to three test systems including the 6-bus, the 8-bus and the 15-bus test systems. Furthermore, a reliable approach has been developed to compare the results obtained using the proposed BSA with those obtained using other well-known metaheuristics. The results show the superiority of BSA over other methods in solving DOCRs coordination problems.
Journal Article
Development of a linearized photovoltaic generator model for simulation studies with electromagnetic transient programs
Summary
In this paper, a linearized equivalent electrical circuit of a photovoltaic generator is developed. The proposed model is based on nonlinear and well‐tested current‐voltage equations which are however used in an alternative mathematical manner. The application of a linearization process, which differs from the well‐known piecewise linear scheme and is based on Taylor's series approximation, leads to uncoupling of the current and voltage quantities in each time step of a digital simulation. Using the proposed equivalent photovoltaic generator circuit, the application of nodal analysis on equivalent resistive circuits derives a photovoltaic system model of linear algebraic equations. This remarkably simplifies photovoltaic systems modeling because one can develop a photovoltaic generator element in electromagnetic transient programs for power systems analysis, of great value to power engineers who are involved in photovoltaic systems modeling. Copyright © 2014 John Wiley & Sons, Ltd.
Journal Article