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This thesis analyzes the integration of large quantities of offshore wind power into power systems through point-to-point or multiterminal HVdc grids that use modular multilevel converters (MMC). Firstly, a simplified method to simulate MMCs is developed with the objective of reducing the simulation times. Secondly, a new control strategy for offshore wind power plants connected through MMC-HVDC links is developed in order to meet the requirements of the new ENTSO-E grid codes (for instance, island operation or black-start). Next, a mathematical study is carried out to estimate the values of the DC fault currents in HVDC grids and the response of several wind power plant control strategies are analyzed in the event of DC faults. Finally, a new DC-DC MMC topology is proposed for HVDC grids.En la tesis se analiza la integración de grandes cantidades de energía eólica en los sistemas eléctricos de potencia a través de redes HVDC punto a punto y multipunto que usan convertidores modulares multinivel (MMC). En primer lugar se desarrolla un modelo que permite reducir los tiempos de simulación a la hora de modelar los MMCs. A continuación se propone una nueva estrategia de control para parques eólicos marinos que permita cumplir con los nuevos requisitos exigidos en los nuevos códigos de red desarrollados por ENTSO-E (por ejemplo, funcionamiento en isla o arranque sin fuentes de energía externas). A continuación se desarrolla un modelo teórico para el estudio de las corrientes de cortocircuitos en redes HVDC y se analiza la respuesta de distintos tipos de controles de parques eólicos ante cortocircuitos en la red DC. Finalmente se propone una nueva topología de convertidor DC-DC MMC para redes HVDC

Integrated control of offshore wind farms and HVDC links with MML converters