DC cable modelling and High Voltage Direct Current grid grounding system
This paper describes the influence of grounding on voltage and current transients during DC-link fault in a High Voltage Direct Current (HVDC) cable system.
High Dynamics Control for MMC Based on Exact Discrete-Time Model with Experimental Validation
Due to the complexity of the system, the control of the Modular Multilevel Converter (MMC) constitutes an intensive research activity.
Supervisory Control for High-Voltage Direct Current Transmission Systems
The growth of renewable energy production is changing the future of power transmission systems.
DC Voltage Control of MMC-based HVDC grid with Virtual Capacitor Control
Ensuring that the DC voltage remains within an acceptable range is a major concern for HVDC systems.
Virtual Capacitor Control: Mitigation of DC Voltage Fluctuations in MMC-based HVDC Systems
The Modular Multilevel Converters (MMCs) have emerged as the most suitable converter technology for HVDC application.
SFCL‑based full-selective protection strategy for multi-terminal HVDC grids: A case study
A protection strategy for high voltage direct current grids using superconducting fault current limiters as main protection component is presented in this work.
A protection strategy for multi-terminal hvdc grids based on mechanical dc circuit breakers
A protection strategy for multi-terminal HVDC (MTDC) grids based on AC/DC converters without fault blocking capability such as half-bridge MMC converters is presented in this paper.
Technical and economic analysis of the R-type SFCL […] in HVDC grids
Mainly used in AC grids, resistive type superconducting fault current limiters may be still more interesting for DC systems due to their capability to reduce high short circuit currents appearing in case of DC cable fault. This limiter reduces the breaking capability, speed, and energy requirements of the required DC circuit breaker allowing the implementation of electro mechanical breakers for fault current interruption. These breakers have lower breaking capability, on load losses, and investment costs in comparison with hybrid circuit breakers based on power electronics. This paper presents a technical and economic analysis of a superconducting fault current limiter used in a radial three terminal high voltage DC grid to protect a cable link. Based on simulation studies using an electro magnetic transient program, an effective system protection will be demonstrated with special attention to the continuity of power flow through healthy parts of the grid.
Phd Ahmed ZAMA “Modeling and Control of Modular Multilevel Converters (MMCs) for HVDC applications”
Common understanding today is that the challenges to develop the SuperGrid are huge at many levels (e.g.: political, societal, economical, financial, scientific, technical…). It is also commonly accepted that the SuperGrid will require novel technologies (breakers, cables, converters…) and operating principles (e.g.: transition from a more passive essentially AC-based power system to a more active AC/DC-based one). This thesis deals with the development of a key actor for SuperGrid technology, that is, AC/DC converters.
A multi-vendor protection strategy for HVDC grids based on low-speed DC circuit breakers
A protection strategy for Multi-terminal HVDC (MTDC) grids based on AC/DC converters without fault handling capability such as half-bridge MMC converters is presented in this paper. The key components of the proposed strategy consist of DC breakers located at each converter station DC side and at each transmission line (overhead line or cable) end, all of them based on low-speed mechanical DC breaker technology with no fault current limiting devices.
