Offshore wind farms integration and frequency support control utilizing hybrid multi-terminal HVDC transmission

This paper proposed a hybrid multi-terminal HVDC (MTDC) system to integrate several distributed offshore wind farms to onshore power grids. And a comprehensive frequency support algorithm for onshore grid was designed. The configuration and operation principles of a typical 4 terminals system are de...

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Bibliographic Details
Main Authors: Cheng-hao Li, Peng Zhan, Jin-yu Wen, Mei-qi Yao, Nai-hu Li, Wei-jen Lee
Format: Conference Proceeding
Language:English
Subjects:
black start
droop control
frequency control
HVDC transmission
Hybrid power systems
line commutation converter
multi-terminal HVDC
Offshore installations
Power conversion
Voltage control
voltage source converter
Wind farms
Wind power
Wind power generation
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Summary:This paper proposed a hybrid multi-terminal HVDC (MTDC) system to integrate several distributed offshore wind farms to onshore power grids. And a comprehensive frequency support algorithm for onshore grid was designed. The configuration and operation principles of a typical 4 terminals system are described. A system control strategies are proposed for both wind farm side VSCs (WFVSCs) and grid side LCCs (GSLCCs). To obtain smooth operation, the WFVSCs are controlled as a voltage source that automatically absorbs power generated by the wind farm and establish a stable AC voltage for wind turbines. DC voltage-current droop control is designed for GSLCCs to maintain the DC voltage and distribute power between two onshore girds. A utility black start-up process without auxiliary power supply was designed and tested. The simulation results in PSCAD/EMTDC were presented to demonstrate the system performance during black starting-up, converter disconnection and frequency variation of one onshore power grid.
ISSN:0197-2618
2576-702X
DOI:10.1109/IAS.2013.6682484