Titel: M2C-Based MTDC System for Handling of Power Fluctuations From Offshore Wind Farms
Författare: Noman Ahmed, Arif Haider, Lennart Ängquist, Hans-Peter Nee
Utgivare: KTH
Årtal: 2011
Ämnesord: Modular multilevel converter, Multi-terminal HVDC transmission, Power fluctuations, Wind power plants, Converter control
Rapport via DIVA
Sammanfattning/Abstract:
In this paper a modular multilevel converter (M2C) basedmulti-terminal direct current (MTDC) system is proposed forthe connection of offshore wind farms. Each M2C ismodelled with 36 sub-modules per arm with a total of 216sub-modules consisting of half bridges. An open-loopconverter control method is employed for the M2Cs. Powersynchronizationcontrol is used instead of a phase-locked loop(PLL) for synchronization. A voltage controller isimplemented with power-synchronization control as an innerloop. By means of numerical simulations in PSCAD, it isshown that the system is self stabilizing both at steady stateand following power fluctuations of the wind farm.