Grid converters increasingly affect power system operation due to the increasing share of renewable energy sources and less conventional power plants. This shift in power generation leads to converter-dominated weak grids, which show critical stability phenomena but also enable converters to contribute to grid stability and voltage support. This thesis presents critical parts of converter controls and describes models to assess their characteristics. These models are used to derive design criteria and dedicated stability analysis methods for grid converter controls. Der steigende Anteil an erneuerbaren Energien in den Energieversorgungsnetzen führt zur Verdrängung konventioneller Kraftwerke. Diese Entwicklung lässt umrichterdominierte und schwache Netzabschnitte entstehen, die kritischen Stabilitätsmechanismen unterliegen, allerdings auch ermöglichen, dass Umrichter aktiv zur Netzstützung und Netzstabilität beitragen können. Die vorliegende Arbeit beschreibt kritische Regelungskomponenten der Umrichter und deren Modellierung. Auf Basis der Modelle werden Auslegungskriterien für die Regelungen abgeleitet und dedizierte Stabilitätsanalysemethoden präsentiert.
Grid converters increasingly affect power system operation due to the increasing share of renewable energy sources and less conventional power plants. This shift in power generation leads to converter-dominated weak grids, which show critical stability phenomena but also enable converters to contribute to grid stability and voltage support. This thesis presents critical parts of converter controls and describes models to assess their characteristics. These models are used to derive design criteria and dedicated stability analysis methods for grid converter controls. Der steigende Anteil an erneuerbaren Energien in den Energieversorgungsnetzen führt zur Verdrängung konventioneller Kraftwerke. Diese Entwicklung lässt umrichterdominierte und schwache Netzabschnitte entstehen, die kritischen Stabilitätsmechanismen unterliegen, allerdings auch ermöglichen, dass Umrichter aktiv zur Netzstützung und Netzstabilität beitragen können. Die vorliegende Arbeit beschreibt kritische Regelungskomponenten der Umrichter und deren Modellierung. Auf Basis der Modelle werden Auslegungskriterien für die Regelungen abgeleitet und dedizierte Stabilitätsanalysemethoden präsentiert.
Hallig Hooge is a tiny marsh island just off the North German coast with about 100 inhabitants. One of them is Katja Just. 16 years ago, she decided to trade her busy city life and her promising career in Munich for the contemplative everyday life on Hooge and hasn't regretted a day since. Despite its seclusion, life never gets dull on Hallig Hooge! From encounters with stubborn Hallig people to fascinating natural spectacles and unexpected challenges on the edge of civilization, Katja Just has a lot of stories to tell. With humor and attention to detail, she presents anecdotes from her life on Hallig Hooge and shows readers how eventful and satisfying life at the supposed end of the world can be.
The Welfare Economics of Public Policy is a great book that should be of interest to all economists interested in applied welfare analysis. It is a good reference book for economists studying the effects of public policy. Finally, it should be a useful textbook for students studying economic policy and applied welfare economics. Jean-Paul Chavas, American Journal of Agricultural Economics . . . a very comprehensive overview of the state of the art in welfare economics. It can be used as a teaching book for advanced students as well as a reference volume for researchers. This duality of possible uses is supported by the fact that very complex issues are presented in an easily readable manner. More technical aspects are then outlined in the appendices of the relevant chapters, offering colleagues the option to study formal considerations in more detail. . . a welcome addition to and expression of the knowledge base of agricultural economics. Stefan Mann, Journal of Agricultural Economics I am absolutely delighted that the authors have revised and republished this text. I have used the previous version for years in my graduate environmental economics course; usually I had to share the one copy I have with students and I felt it was a shame that these students did not have the opportunity to purchase the book since every serious environmental economist should have this volume on their shelf. It has been a continuous reference volume for me over the years and I am sure this is true of many others in the discipline. In the field of applied welfare analysis (spanning environmental economics, international trade, agricultural policy, etc.) there is no need for further elaboration when Just, Hueth and Schmitz is referenced. Everyone knows the book that is being referred to: the bible of applied welfare economics. Catherine Kling, Iowa State University, US For the record, I am one of the people who requested that the authors revise and re-issue their textbook. It is an extremely valuable book for applied economists; as with the previous edition, I will use it extensively in two of my courses and consult it frequently in my own research endeavors. Richard Adams, Oregon State University, US The original book is very well known in our profession and is still used in many classes. It will be wonderful to have a revised edition of this classic book. Colin Carter, University of California, Davis, US This outstanding text, a follow-up to the authors award-winning 1982 text, provides a thorough treatment of economic welfare theory and develops a complete theoretical and empirical framework for applied project and policy evaluation. The authors illustrate how this theory can be used to develop policy analysis from both theory and estimation in a variety of areas including: international trade, the economics of technological change, agricultural economics, the economics of information, environmental economics, and the economics of extractive and renewable natural resources. Building on willingness-to-pay (WTP) measures as the foundation for applied welfare economics, the authors develop measures for firms and households where households are viewed as both consumers and owner/sellers of resources. Possibilities are presented for (1) approximating WTP with consumer surplus, (2) measuring WTP exactly subject to errors in existing econometric work, and (3) using duality theory to specify econometric equations consistent with theory. Later chapters cover specific areas of welfare measurement under imperfect competition, uncertainty, incomplete information, externalities, and dynamic considerations. Applications are considered explicitly for policy issues related to information, international trade, the environment, agriculture, and other natural resource issues. The Welfare Economics of Public Policy is ideal for graduate and undergraduate courses in applied welfare economics, public policy, agricultural policy, and environmental economi
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