Journal ArticleDOI
A Novel Distributed Direct-Voltage Control Strategy for Grid Integration of Offshore Wind Energy Systems Through MTDC Network
Rodrigo Teixeira Pinto,Pavol Bauer,Silvio Rodrigues,E. Wiggelinkhuizen,J. Pierik,Braham Ferreira +5 more
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TLDR
A classification of MTDC networks is proposed and the most utilized control structures for VSC-HVDC are presented, since it is currently recognized as the best candidate for the development of supergrids, followed by a discussion of the merits and shortcomings of available DC voltage control methods.Abstract:
Although HVDC transmission systems have been available since mid-1950s, almost all installations worldwide are point-to-point systems. In the past, the lower reliability and higher costs of power electronic converters, together with complex controls and need for fast telecommunication links, may have prevented the construction of multiterminal DC (MTDC) networks. The introduction of voltage-source converters for transmission purposes has renewed the interest in the development of supergrids for integration of remote renewable sources, such as offshore wind. The main focus of the present work is on the control and operation of MTDC networks for integration of offshore wind energy systems. After a brief introduction, this paper proposes a classification of MTDC networks. The most utilized control structures for VSC-HVDC are presented, since it is currently recognized as the best candidate for the development of supergrids, followed by a discussion of the merits and shortcomings of available DC voltage control methods. Subsequently, a novel control strategy-with distributed slack nodes-is proposed by means of a DC optimal power flow. The distributed voltage control (DVC) strategy is numerically illustrated by loss minimization in an MTDC network. Finally, dynamic simulations are performed to demonstrate the benefits of the DVC strategy.read more
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Journal ArticleDOI
DC Microgrids—Part II: A Review of Power Architectures, Applications, and Standardization Issues
TL;DR: In this article, an overview of the state of the art in dc microgrid protection and grounding is provided, which discusses both design of practical protective devices and their integration into overall protection systems.
Journal ArticleDOI
Quasi Two-Level Operation of Modular Multilevel Converter for Use in a High-Power DC Transformer With DC Fault Isolation Capability
I. A. Gowaid,Grain Philip Adam,Ahmed Massoud,Shehab Ahmed,Derrick Holliday,Barry W. Williams +5 more
TL;DR: In this paper, a quasi two-level operating mode of the modular multilevel converter is proposed, where the converter generates a square wave with controllable dv/dt by employing the cell voltages to create transient intermediate voltage levels.
Journal ArticleDOI
Power Flow Algorithms for Multi-Terminal VSC-HVDC With Droop Control
Wenyuan Wang,Mike Barnes +1 more
TL;DR: In this paper, the problem posed by complex, nonlinear controllers for power system load flows employing multi-terminal voltage source converter (VSC) HVDC systems is addressed.
Journal ArticleDOI
Trends of offshore wind projects
TL;DR: In this article, the authors present the current status of the offshore wind industry and identify trends in Offshore Wind Projects (OWPs) This was accomplished via a thorough analysis of the key characteristics of the commissioned and under-construction European OWPs, including country, installed capacity, number of turbines, water depth, project area, distance to shore, transmission technology and investment cost.
Journal ArticleDOI
DC voltage control and power sharing in multiterminal DC grids based on optimal DC power flow and voltage-droop strategy
TL;DR: In this article, the authors proposed an effective dc voltage and power sharing control structure for multiterminal dc (MTDC) grids based on an optimal power flow (OPF) procedure and voltage-droop control implemented in the different hierarchical layers.
References
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TL;DR: The author did not name the algorithm, but it is likely to be VAR Optimization by Evolutionary Algorithm, which is a very simple and straightforward way to go about solving the problem of how to Optimize Power Dispatch.
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Adaptive Droop Control Applied to Voltage-Source Inverters Operating in Grid-Connected and Islanded Modes
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Proceedings ArticleDOI
Future electronic power distribution systems a contemplative view
TL;DR: Several ideas for modeling, analysis, and system-level design of such systems, including power flow control, protection, stability, and subsystem interactions, are presented, especially in the presence of renewable energy sources.
Proceedings ArticleDOI
Dynamic modelling of a wind turbine with doubly fed induction generator
TL;DR: In this article, a dynamic model of an important contemporary wind turbine concept is presented, namely a doubly fed (wound rotor) induction generator with a voltage source converter feeding the rotor.