Browse Conferences
Impact of DC grid contingencies on AC system stability
In order to reliably and safely operate future multi-terminal HVDC grids, different protection strategies are currently being developed and presented in the literature. Especially for large DC grids, it is important to investigate how the c...
Impact of model complexity on mixed AC/DC transient stability analysis
Model complexity may have a significant impact on transient stability results of mixed AC/DC systems. The dynamics of various mixed AC/DC models with a focus on different generator orders and multi-level modular converter (MMC) VSCHVDC mode...
Voltage stability analysis and control of wind farms connected to weak grids
Weak AC grids can pose serious interconnection problems by limiting the amount of wind power that can be integrated. Weak AC grids have high transmission impedance compared to strong AC grids. The connection of more wind power generators in...
Understanding direct current electrical architectures and enabling technologies through modelling and simulation
As armed forces begin to adopt more widespread use of pulsed-power loads and more capable energy storage solutions, there is a need to consider the electrical system design to best service the expected network loads. The challenges for volt...
Protection strategy for multi-terminal DC networks with fault current blocking capability of converters
High voltage dc networks are a promising technology to flexibly transmit power over long distances. However, dc grid protection is still a major challenge. DC fault clearance can be mainly achieved with three devices. These are ac circuit b...
Intersystem fault clearing in hybrid AC/DC power systems with full bridge modular multilevel converters
The parallel routing of high voltage AC and DC systems on the same transmission tower is one new option for a timely integration of HVDC technology into existing AC power grids, enhancing the latter's flexibility. However, the rare event of...
Fault analysis of HVDC systems with partial underground cabling
Due to recent political developments in Germany new High Voltage Direct Current (HVDC) transmission right-of-ways will have to be realised preferably as cable systems, especially near densely populated areas. Hence, overhead line (OHL) syst...
Fault arc extinction and system re-start on HVDC transmission lines using LCC or VSC full-bridge converters with integrated arc recovery simulation models
HVDC systems in combination with overhead lines are frequently affected by non-permanent ground faults at DC side due to arcs. To limit the impact to the DC system or the connected AC system(s) at line-to-ground faults or unsuccessful resta...
Evaluation of half-bridge modular multilevel converter model for VSC-HVDC transient stability studies
This paper evaluates the modeling methods for half-bridge modular multilevel converter (HB-MMC) based voltage-sourced converter (VSC) HVDC system for electromechanical transient (RMS) program. At first, the electrical and control system rep...
Small-signal model analysis of droop-controlled modular multilevel converters with circulating current suppressing controller
This paper presents a small signal eigenvalue analysis applied to a droop-controlled HVDC terminal based on the Modular Multilevel Converter (MMC) topology. The applied linearised model is derived from previous modelling efforts recently pr...