Jun Liang

This book explores the mechanisms and applications of acoustic metasurfaces in the hypersonic transition control area. It begins with an introduction of the concepts of acoustic metasurface and hypersonic boundary-layer stabilization, which also provides a full scene of the research progress in the past two decades. This book then discusses the modeling methods of various acoustic metasurfaces, including the regular and irregular ones, and describes how the models are to be used in theoretical analysis and numerical calculations. The design strategies and optimization methods are presented to promote the applications in the engineering community. The possible stabilization mechanisms are explored, and the proposed analysis methods are used to clarify other flow instabilities. This book delivers valuable insight for aerospace engineers, postgraduate students, and researchers.

Provides a deep understanding of the mechanisms, analysis methods, stability criteria, and stabilization methods for converter-driven oscillations in power systems The extensive integration of converter-interfaced resources into power systems has significantly increased the occurrences of converter-driven oscillations, posing a serious new challenge to power system stability over the past decade. Stability Analysis of Grid-Connected Converters offers a comprehensive understanding of converter interactions with power systems and their oscillation characteristics. Based on academic research, this book is to explicitly connect mathematical mechanism and converter-driven oscillation phenomena, helping readers with deep insight into converter-driven oscillations. To provide a solid foundation for studying converter-driven oscillations, the book is organized into ten chapters, covering topics such as stability mechanisms, modeling, stability criteria, analysis methods, and stabilization techniques for different types of converters. Equipping readers with the knowledge to design stable converter systems and tackle critical power system challenges, Stability Analysis of Grid-Connected Converters: Describes the history of converter-driven oscillations and presents recent understandings and categorizations of these oscillations in sub-synchronous oscillation classification and power system stability classificationPresents modeling methods for typical converter control approaches, including grid-following and grid-forming convertersExplains the mechanism of mirror-frequency oscillations induced by converters and clarifies the fundamental causes of converter-driven oscillationsProvides comprehensive stability analysis methods and distinctions in their applications, including the impedance measurement methods for stability analysis for black-box systemsAnalyzes and specifies the stability characteristics of both grid-following and grid-forming converters, with relevant stabilization measures provided accordingly Stability Analysis of Grid-Connected Converters is an essential resource for engineers, system operators, and converter designers addressing power system stability challenges. It is also an excellent supplementary text for graduate and advanced undergraduate courses in power systems, renewable energy integration, and power electronics.

This book discusses HVDC grids based on multi-terminal voltage-source converters (VSC), which is suitable for the connection of offshore wind farms and a possible solution for a continent wide overlay grid. HVDC Grids: For Offshore and Supergrid of the Future begins by introducing and analyzing the motivations and energy policy drives for developing offshore grids and the European Supergrid. HVDC transmission technology and offshore equipment are described in the second part of the book. The third part of the book discusses how HVDC grids can be developed and integrated in the existing power system. The fourth part of the book focuses on HVDC grid integration, in studies, for different time domains of electric power systems. The book concludes by discussing developments of advanced control methods and control devices for enabling DC grids. Presents the technology of the future offshore and HVDC gridExplains how offshore and HVDC grids can be integrated in the existing power systemProvides the required models to analyse the different time domains of power system studies: from steady-state to electromagnetic transients This book is intended for power system engineers and academics with an interest in HVDC or power systems, and policy makers. The book also provides a solid background for researchers working with VSC-HVDC technologies, power electronic devices, offshore wind farm integration, and DC grid protection.