Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/66005
Title: Coordinated control of wind farms and MTDC grids for system frequency support
Authors: Li, Y
Xu, Z
Keywords: automatic wind farm power regulation
DC droop control
Frequency regulation loop
Multi-terminal DC (MTDC)
Wind power fluctuations
Issue Date: 2017
Publisher: Taylor & Francis
Source: Electric power components and systems, 2017, v. 45, no. 4, p. 451-464 How to cite?
Journal: Electric power components and systems 
Abstract: This paper proposes a coordinated control strategy to provide system frequency support for separated main grids from offshore wind farms (WFs) that are integrated through multi-terminal DC (MTDC) system. The control strategy consists of two control loops including the MTDC frequency regulation loop (FRL) and the automatic WF power regulation loop (AWFPRL). In events of AC main grid disturbances, the former can re-dispatch MTDC grid power flow to support system frequency, while the latter can adjust wind power output accordingly through the variable frequency control of WF-connected converters. Inertia energy stored in wind turbines can be utilized to stabilize system frequency via MTDC grids. Moreover, wind power fluctuations can also be smoothed by the proposed control. An expression of frequency response coefficient is calculated, which is used to quantify the contribution of frequency support from offshore WF-connected MTDC system. Case studies have been conducted to demonstrate the effectiveness of the proposed control strategy using a four-terminal DC grid.
URI: http://hdl.handle.net/10397/66005
ISSN: 1532-5008
EISSN: 1532-5016
DOI: 10.1080/15325008.2016.1264500
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