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This paper presents a voltage control for an offshore load fed by a Multi-Terminal VSC-HVDC transmission system (MTHVDC). The studied system is composed by two GSCs (Grid Side Converters) and one OSC (Offshore Side Converter). The objective is to maintain the amplitude and frequency of the AC voltage constant at the offshore terminal with a minimum overshoot. A vector control strategy including a...
When using HVDC there are two available commercial possibilities: Transmissions based on Line Commutated Converters (LCC) and based on Voltage Source Converters (VSC). VSC-HVDC is more suitable for creating offshore grids. Despite this fact, many LCC transmission systems are in operation across the sea interconnecting mainlands or islands. This work addresses the concept of connecting wind power plants...
The article introduces a hierarchical control structure for Multiterminal High Voltage Direct Current (M-HVDC) systems. The presented hierarchy is similar to the control structure of the classical AC systems divided in primary, secondary and tertiary control. The design and interaction between the secondary, or power control, and the primary controllers, or voltage control, are discussed. Furthermore,...
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