A5017431304- HVDC Systems and Fault Protection
- Microgrid Control and Optimization
- High-Voltage Power Transmission Systems
- Wind Turbine Control Systems
- Power System Optimization and Stability
- Thermal Analysis in Power Transmission
- Optimal Power Flow Distribution
- Electric Power System Optimization
- Power System Reliability and Maintenance
- Electric Power Systems and Control
- Coal and Coke Industries Research
- Lightning and Electromagnetic Phenomena
- Islanding Detection in Power Systems
- Railway Systems and Energy Efficiency
- Advanced DC-DC Converters
- Multimedia Communication and Technology
- Silicon Carbide Semiconductor Technologies
- Renewable energy and sustainable power systems
- Advanced Power Generation Technologies
- Transport and Logistics Innovations
- Frequency Control in Power Systems
- Physics and Engineering Research Articles
- Vibration and Dynamic Analysis
- Power Systems Fault Detection
- Advanced Research in Systems and Signal Processing
Fraunhofer Institute for Wind Energy Systems
2014-2017
This paper presents the possibility of using a point-to-point voltage source converter - high direct current (VSC-HVDC) transmission system connecting offshore wind power plant (WPP) to onshore grid as black start unit initiate restoration process for an interconnected electrical after large area blackout. The station (CS) provides in order establish island within integrated CS's and WPP's black-start. Electric loads on mainland can be resupplied auxiliary start-up thermal provided. Possible...
In this work a multi-objective model predictive control for reactive power management in transmission connected distribution grids with high share of wind is presented. The proposed utilizes capabilities farms and tap-changer positions order to improve grid operation. Control signals namely set-points are smoothed over the forecast horizon. Further possible optimization objectives loss reduction, voltage profile smoothing complying exchange limits grid. A mixed-integer non-linear optimal...
In this publication, the authors present methodology and example results for analysis of ancillary services an offshore wind farm cluster its electrical power system. Thereby operation tool Wind Cluster Management System (WCMS) is used as simulation to evaluate certain planning scenarios. Emphasis made on two topics: 1) integration high voltage direct current (HVDC) technology WCMS, 2) service analysis. As examples, source converter based HVDC (VSC-HVDC) provision reserve respectively...
This paper presents an approach for the calculation and estimation of control interactions between asynchronous power systems coupled via multi-terminal high-voltage direct current grids using static analysis methods. aims at possible application within online security assessment where, as today, methods are still a common practice. Therefore, postcontingency flow is evaluated integrated solution AC DC in power-flow algorithm. Thereby, equations voltage frequency converter stations,...
Frequency control in interconnected electrical power systems is nowadays realized using the networks' conventional thermal plants. With ongoing changes worldwide share of these plants decreasing while renewable resources such as wind and photovoltaics are increasing their continuously. Up to now a contribution sources primary frequency not systems. This paper describes possibilities support turbines with enhanced active functionalities synthetic inertia. The effects analyzed IEEE 39 bus...
As a consequence of government objectives in terms CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> reduction and with the aim increasing share renewable energy sources within power system Europe, offshore sites for wind gain more importance. Within last years installed capacity reached 3 GW German Bight North Sea, most them being connected through high voltage direct current (hvdc) transmission systems. Since systems is increasing,...
The article at hand gives an overview of a newly developed method and tool to flexibly efficiently remediate different kinds congestion in the power grid. presented approach consists three main steps: Building network model, identifying technical factors influencing congestion, formulating solving optimization problem by changing active set points plants. Within approaches for technically economically optimized redispatch are presented. paper focuses on development solution considering both,...
In this publication the authors present several aspects of integrating High-Voltage Direct Current (HVDC) transmission into power flow analysis algorithms. particular, will discuss speed and robustness two different approaches, integration droop-control schemes loss modeling converter stations based on electronic device characteristics considering topologies.
This contribution investigates the influence of SiC semiconductor devices for HVDC transmission technology on system level. Different are recently in focus many scientific publications. However, extra high power applications, SiC-JFET exhibits promising properties. In order to assess impact losses such a new technology, scenario large-scale meshed offshore using CIGRE B4 DC Grid Test System is investigated. contrast classical approaches flow calculations, detailed representation...
Here, a methodical research on the stability and response of converter‐based generation model is conducted, focusing accompanying effects system split scenario in (European) electricity transmission network. The purpose this to analyse behaviour generic but detailed case extreme contingencies. In particular focus set reduced short‐circuit power, high rates change frequency, sudden voltage phase jumps at point common coupling (PCC). These are analysed by means electromagnetic transient (EMT)...
Power oscillations pose a non-negligible threat to the stability of grid. Static synchronous compensators (STATCOMs) allow damping power prevent loss synchronism and maximize systems' transmission capacity. However, oscillation control via reactive (POD-Q) with STATCOMs shows undesirable fluctuations in its output whenever generator's mechanical is ramped. The common scheme includes high-pass filtering input signal distinguish from changes system's operating point. In literature, washout...
Transmission system operators have to utilize their network grids a maximum degree of transmission capability. Increased current in the lines especially close proximity metallic pipelines will cause an electromagnetic interface between high voltage and neighbouring buried pipes, which may limit capability lines. Especially Germany, this is big challenge due dense infrastructure population. Implementing compensation line under ground or on tower combined with structures reduce total induced...