Abstract
A continuing drive to decarbonize the power system is leading to an increase in renewable energy source projects, as well as numerous interconnector projects to transmit power to the required load centres. Whilst providing steady state power injection, there are also requirements for these projects to contribute to the dynamic support of the power system, with services such as inertia response, and frequency and voltage regulation. Voltage sourced converter interconnector schemes can be operated with either the rectifier or inverter station operating in synchronous grid forming mode, while the other station operates in grid following mode, ensuring that the DC voltage is maintained. This enables the grid forming station to provide dynamic support while the grid following station controls the energy balance of the system. As power systems at both end of the interconnector become weaker, the ability for both ends to provide dynamic support would be beneficial. This paper presents a coordinated control method that allows the grid following side to provide dynamic support without significantly disturbing its AC system, thereby avoiding an AC system fault cascading between AC systems via the HVDC link. This is achieved by altering the DC voltage, which is used to set the grid forming power reference. As the grid following side reduces the power absorption to aid its system, the grid forming side reduces its power injection.
Published Version
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