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Title: Stability analysis of the Namibian power grid with integration of large offshore wind farms using a VSC-HVDC scheme
Authors: Mbaimbai, Nicky K.
Keywords: Renewable energy sources;Electrical power production
Issue Date: 13-May-2022
The use of the wind for electrical power production has seen a meteoric increase due to the
wind being a free and abundantly available resource, especially when the site is offshore. The
wind resource along the Namibian coastline could therefore be implemented to develop
offshore wind farms that would enable Namibia to meet its steadily increasing power demand.
The efficient transmission of bulk power from offshore sites to the onshore AC grid is widely
achieved through voltage source converter-based high voltage direct current (VSC-HVDC)
This study aims to investigate the power system stability response of the Namibian network,
particularly in terms of rotor angle stability, to the integration of large offshore wind farms. A
single machine infinite bus (SMIB) model developed in DIgSILENT PowerFactory was used
as a test bed for the study. Transient and small-signal stability analysis in relation to different
fault scenarios on the main transmission lines were then carried out after doubly-fed induction
generators (DFIGs) representing offshore wind farms were integrated into the SMIB model.
The same methodology was applied on a reduced model of the NamPower network.
DigSILENT PowerFactory’s VSC-HVDC offshore wind farm template model was integrated
to a reduced model of the NamPower network. The entire network was then subjected to
different fault scenarios along backbone transmission lines, major busbars and the HVDC link
at different penetration levels of offshore wind power.
The study established that the integration of large offshore wind farms using a VSC-HVDC
scheme to the reduced NamPower network negatively affected the network's transient and
small-signal stability. However, there was a positive impact on the voltage levels of the
network due to the reactive power compensation supplied by the VSC-HVDC link. The VSC-HVDC link also maintained low-voltage ride-through of the offshore wind farms during faults
that comply with the Namibian transmission grid code.
A thesis submitted in fulfillment of the requirements of the Degree of Master of Engineering in Electrical Power, Durban University of Technology, Durban, South Africa, 2021.
Appears in Collections:Theses and dissertations (Engineering and Built Environment)

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