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The South West scheme is an important part of the development of the Swedish national grid and is a key facility to enable the production of renewable energy, in accordance with Swedish and EU energy policy. It will reinforce the AC network, increase operational reliability, and deal with transmission limitations in southern Sweden and between Sweden and Norway. The paper describes the first phase...
The use of Voltage Source Converter (VSC) based HVDC transmission has been strongly suggested for the interconnection of various power networks. However, VSCs susceptibility to DC faults, particularly the potential damage caused to the converter IGBTs due to overcurrent, is an issue that must be addressed. This paper analyses the behaviour of a VSC-based HVDC system under varying DC fault conditions...
This paper proposes a recovery strategy for wind energy-fed voltage source converter high voltage DC transmission systems, capable of maintaining power balance between the AC and DC sides during different AC faults. This prevents the DC link voltage rise as a result of trapped energy. This reduces the voltage and current stresses on the switching devices. Also, the strategy ensures the converters...
This paper presents the detailed system design of Shanghai Nanhui project — the first VSC-HVDC demonstration project in China. Two 18MW VSC converters based on Modular Multi-level topology are connected to transfer the energy generated by 11 wind turbines into Nanhui AC network. It has been verified that an improvement on voltage quality and fault ride through performance of Nanhui windfarm have been...
This paper compares the site aspects of a Voltage-Sourced Converter (VSC-HVDC) project and a Line-Commutated Converter (LCC-HVDC) project of similar rating. Initially a brief description of the two technologies is presented. Then the project information for the EWIC (Shotton) and Grita (Galatina) sites is provided. Next, a comparison of the overall sites and converter buildings is given. This considers...
Interconnection of High Voltage Direct Current (HVDC) links into networks is key to a future HVDC grid spanning large regions. Various factors including the evolution of cable technology will lead to a variety of DC voltages and a need to provide a DC/DC step up/down at high power ratings (beyond 500 MW). This paper analyses a High Voltage (HV) DC/DC converter utilising an intermediate AC link between...
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