Coordinated Operation and Control of VSC Based Multiterminal High Voltage DC Transmission Systems

This paper deals with a multiterminal voltage source converter (VSC)-based high voltage dc transmission system (M-HVDC) connecting offshore wind farms to onshore ac grids. Three M-HVDC configurations studied, each with different control strategies. The voltage-current characteristics of VSCs are pre...

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Bibliographic Details
Published in:IEEE transactions on sustainable energy 2016-01, Vol.7 (1), p.364-373
Main Authors: Raza, Ali, Dianguo, Xu, Yuchao, Liu, Xunwen, Su, Williams, B. W., Cecati, Carlo
Format: Article
Language:English
Subjects:
Configuration
Control systems
Converters
Electric converters
generalized droop control strategy
High voltages
HVDC transmission
improved proportional droop control
Offshore energy sources
offshore wind farms
Power conversion
Strategy
Voltage
Voltage control
VSC based multi-terminal HVDC
Wind farms
Wind power
Wind power generation
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Summary:This paper deals with a multiterminal voltage source converter (VSC)-based high voltage dc transmission system (M-HVDC) connecting offshore wind farms to onshore ac grids. Three M-HVDC configurations studied, each with different control strategies. The voltage-current characteristics of VSCs are presented and VSC converter operation with different output powers from offshore wind farms is assessed. A generalized droop control strategy is mainly used to realize autonomous coordination among converters without the need of communication. Operation of the three configurations with respect to their control system is analyzed through PSCAD/EMTDC simulations and experimentation. Results show control performance during wind power change, eventual permanent VSC disconnection, and change in power demand from the ac grid side converter.
ISSN:1949-3029
1949-3037
DOI:10.1109/TSTE.2015.2497340