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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...
The modular multilevel converter (MMC) is a newly introduced switch-mode converter topology with the potential for high-voltage direct current (HVDC) transmission applications. This paper mainly focuses on the hierarchical structure, functional components and hardware configuration of the control and the protection (C&P) system for MMC VSC-HVDC. The overall structure of (C&P) system based...
The introduction of HVDC light technology has been a significant step towards developing DC transmission grids. However, all voltage source converters (VSC) employed with HVDC are completely defenceless against DC faults, and significant further technical advances are required to achieve security and reliability levels that exist with AC grids. This paper proposes building DC grids using VSC converters...
This paper focuses on the control schemes required on offshore VSC-HVDC networks to transmit the power to the onshore grid and provide fast frequency response for the AC grid. The simulation results show the benefits of such control scheme to restore the frequency in the grid after a loss of generation. The results further investigated the consequence of frequency disturbance in the islanded offshore...
In this paper, a type of high power DC-DC converter based on IGBT switches is proposed. Basically, the converter consists of two bidirectional IGBT bridges linked by a pair of energy storage capacitors. It is capable of MW power transfer and can achieve very high voltage ratios. Moreover, the converter can alleviate the overvoltage and overcurrent problems when a DC fault happens on either side. Both...
The Phasor Measurement Unit (PMU) is deemed vital to achieving the wide area monitoring and control requirements of the Smart Grid. The devices are capable of capturing time synchronised power system quantities at a very high resolution and accuracy. They are intended to provide key control inputs to both, intra-network High Voltage DC (HVDC) links and potential Thyristor Controlled Series Capacitor...
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