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Energies 2015, 8(7), 7100-7121; doi:10.3390/en8077100

Improved Adaptive Droop Control Design for Optimal Power Sharing in VSC-MTDC Integrating Wind Farms

State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
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Author to whom correspondence should be addressed.
Academic Editor: Paul Stewart
Received: 28 April 2015 / Revised: 24 June 2015 / Accepted: 7 July 2015 / Published: 14 July 2015
(This article belongs to the Special Issue Electrical Power and Energy Systems for Transportation Applications)
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Abstract

With the advance of insulated gate bipolar transistor (IGBT) converters, Multi-Terminal DC (MTDC) based on the voltage-source converter (VSC) has developed rapidly in renewable and electric power systems. To reduce the copper loss of large capacity and long distance DC transmission line, an improved droop control design based on optimal power sharing in VSC-MTDC integrating offshore wind farm is proposed. The proposed approach provided a calculation method for power-voltage droop coefficients under two different scenarios either considering local load or not. The available headroom of each converter station was considered as a converter outage, to participate in the power adjustment according to their ability. A four-terminal MTDC model system including two large scale wind farms was set up in PSCAD/EMTDC. Then, the proposed control strategy was verified through simulation under the various conditions, including wind speed variation, rectifier outage and inverter outage, and a three-phase short-circuit of the converter. View Full-Text
Keywords: multi-terminal DC (MTDC); improved droop control; power sharing; offshore wind farm; voltage source converter (VSC) multi-terminal DC (MTDC); improved droop control; power sharing; offshore wind farm; voltage source converter (VSC)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ran, X.; Miao, S.; Wu, Y. Improved Adaptive Droop Control Design for Optimal Power Sharing in VSC-MTDC Integrating Wind Farms. Energies 2015, 8, 7100-7121.

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