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

Citation
Adeuyi OD, Cheah-Mane M, Liang J, et al. (2017). Frequency support from modular multilevel converter based multi-terminal HVDC schemes. Cardiff University. http://doi.org/10.17035/d.2017.0031985755


Access Rights: Data can be made freely available subject to attribution
Access Method: Click to email a request for this data to opendata@cardiff.ac.uk

Dataset Details
Publisher: Cardiff University
Date (year) of data becoming publicly available: 2017
Data format: .xlsx
Estimated total storage size of dataset: Less than 100 megabytes
Number of Files In Dataset: 5
DOI: 10.17035/d.2017.0031985755

Description

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. Analyses  were caried out of 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 3-terminal MMCHVDC system was 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 were compared.

The data comprises:
(influence of equivalent synthetic inertia constant and cell capacitance)
active power in per-unit (pu) over time for cases where the synthetic inertia constant is 6.95s,  20.85s and 27.9s;
active power in per-unit (pu) over time using a cell-capacitance of 2.5mF, 7.5mF and 10mF;
DC voltage in pu over time for cell-capacitance values of 2.5mF, 7.5mF and 10mF;
DC Voltage in pu over time for cases where the synthetic inertia constant is 6.95s,  20.85s and 27.9s;

(frequency support characteristics of different energy sources due to a sudden 1800 MW generation loss on the main AC grid)
active power (pu) over time for the five different cases - no control, DC capacitor only, DC capacitor and wind farms, DC capacitor and other AC system, and coordinated control;
DC voltage (pu) over time for the five different cases;
frequency (Hz) over for the five different cases;

and
additional power (pu) over time from equivalent capacitance of MMCs, wind turbine rotating mass and other AC system during the case of coordinated control.

Research results based upon these data are published at  http://doi.org/10.1109/PESGM.2015.7286086




Keywords

Modular multilevel converter (MMC)

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Last updated on 2019-21-10 at 11:40