Abstract
Multi-terminal Direct Current Transmission (MTDC) is an emerging and promising technology for the transmission of electricity and the main initiator of the development of MTDC grids is offshore wind generation. However, prior to their construction, a thorough investigation of different aspects of their implementation and operation is required. In this research, an MTDC grid with voltage margin control consisting of voltage source converters (VSCs) and a high frequency cable model was implemented in Matlab/SIMULINK (R2015b, The MathWorks, Inc., Natick, MA, USA). Small-signal stability analysis was carried out to investigate the sensitivity of the grid’s interaction modes to the operating point, the structure of the grid, and the selection of the voltage controlling converter. Based on the findings of these analyses, a strategy for droop control method is proposed and demonstrated.
Highlights
The development of Multi-Terminal Direct Current (MTDC) grids was initiated by the vast wind power generation located far from the coastline
This study examined the analysis of the dominant interaction mode with respect to the selection of a voltage controlling converter
Left from the red lines was an area of lower stability, and right from the red lines was an area of higher stability of the dominant interaction mode
Summary
The development of Multi-Terminal Direct Current (MTDC) grids was initiated by the vast wind power generation located far from the coastline. Before the wide commissioning of these grids, researchers worldwide are investigating different aspects of their control, operation and protection [2,3,4,5,6] In this context, small-signal stability analysis is an analytical tool that could provide answers to several questions. In [8], a sensitivity analysis of the control modes was performed with respect to gains in voltage droop control and converter capacitance. In [12] the authors tracked the eigenvalues of two-terminal and three-terminal systems under different loading conditions, i.e., operating points and different gains of the direct-voltage controller. They did not undertake a thorough analysis of certain modes.
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