Browse Conferences
Risk of Multiple Cross-Over of Control Characteristics in Multiterminal HVDC
HVDC grids have been made practical with the introduction of Voltage Source Converters (VSC). The development of VSC technology has, and continues to be rapid, with new converter topologies and new manufacturers entering the market. For the...
Low Frequency AC Transmission - Elements of a Design for Wind Farm Connection
Low frequency AC (LFAC) provides an alternative to HVDC and HVAC connections for offshore wind farms. Charging current is reduced as compared to standard 50Hz or 60Hz transmission and cable length thus may be extended. LFAC links to wind fa...
Interaction between the Voltage-Droop and the Frequency-Droop Control for Multi-Terminal HVDC Systems
MTDC systems need to provide a high level of reliability as well as efficient support to the interconnected AC grids. This can be achieved by equipping each converter with a dual controller combining both the voltage-droop and the frequency...
Distributed Control for LCL DC Hub Enabling Reliable Energy Transfer in Future DC Grids
The multiport LCL dc hub is a high power electronic dc substation used to interconnect multiple dc systems in the future dc transmission grids. This paper proposes a distributed power balance controller for high power multiport LCL DC hub. ...
Secure and optimal operation of hybrid AC/DC grids with large penetration of offshore wind
This study focuses on the the reliability of HVDC grids, analysing the secure and optimal operation of transmission systems consisting of both HVDC (High Voltage Direct Current) and HVAC (High Voltage Alternating Current) interconnections, ...
Frequency support among asynchronous AC systems through VSCs emulating power plants
This paper proposes a new control scheme for the Voltage Source Converters (VSCs) of a High Voltage Direct Current (HVDC) grid connecting asynchronous AC systems, so that the latter can mutually support their frequencies after a disturbance...
Substation layout for multi-terminal HVDC systems and neutral conductor arrangements for reduced field emissions
Beside the future need for offshore HVDC grids also the need for future onshore HVDC grids are currently extensively discussed. The requirements for HVDC substations as well as for HVDC connections for onshore and offshore applications diff...
Optimal Steady-State Operation of a MTDC system based on DC-Independent System Operator Objectives
This paper introduces the new concept of DC Independent System Operator, DC-ISO. The DC-ISO will be responsible for ensuring the reliability and security of the MTDC system in real-time and co-ordinate the supply of and demand for electrici...
Frequency control capability of VSC-HVDC transmission system
High voltage direct current (HVDC) systems have been used as an effective solution to transmit power over long distances. Performance of HVDC systems has significantly improved with the emergence of voltage source converter based HVDC (VSC-...
Delivery of the Nan'ao multi-terminal VSC-HVDC system
This paper provides an overview of the development and technology challenges of the world's first multi-terminal VSC-HVDC link that was successfully commissioned on 25th of December 2013. The link consists of three converter stations at thr...