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Frequency support from modular multilevel converter based multi-terminal HVDC schemes

Adeuyi, Oluwole Daniel, Cheah, Marc, Liang, Jun, Yanan, Wu, Chang, Li, Wu, Xueguang and Jenkins, Nicholas 2015. Frequency support from modular multilevel converter based multi-terminal HVDC schemes. Presented at: 2015 IEEE Power and Energy Society General Meeting (PES 2015), Denver Colorado, USA, 26-30 July 2015.

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Multiterminal HVDC (MTDC) schemes are intended to transfer power from offshore wind farms to land and interconnect the grids of adjacent countries, through Voltage Source Converters (VSC). The modular multilevel converter(MMC) topology of VSCs is a more recent development which has low harmonics, reduced losses and occupies less space. This paper analyses the frequency support characteristics of MMC-based multiterminal HVDC schemes, using the energy transferred from the capacitance of the MMCs, wind turbine rotating mass and other AC systems. A generic formulation of an equivalent synthetic inertia constant is proposed to determine the energy transferred from the MTDC scheme. A 3-terminal MMC-HVDC system is utilised to study the influence of cell capacitance of the submodules and the proposed synthetic inertia constant of the MTDC system on the frequency support capability of the MMC capacitors. The time response and energy capability of the different energy sources of the MTDC system are compared.

Item Type: Conference or Workshop Item (Paper)
Date Type: Completion
Status: Unpublished
Schools: Engineering
Subjects: T Technology > T Technology (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Uncontrolled Keywords: frequency support, inertial response, high voltage direct current transmission, offshore wind farm, modular multilevel converters
Funders: Research Councils UK, EPSRC UK and the NSFC China, European Union FP7 Programme, State Grid Corporation of China
Last Modified: 19 Oct 2019 03:08

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