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Energies 2017, 10(9), 1435; doi:10.3390/en10091435

Subsynchronous Torsional Interaction of Wind Farms with FSIG Wind Turbines Connected to LCC-HVDC Lines

1
Department of Electrical Engineering, North China Electric Power University, Baoding 071003, China
2
State Key Laboratory of Advanced Power Transmission Technology (Global Energy Interconnection Research Institute), Beijing 102209, China
*
Author to whom correspondence should be addressed.
Received: 21 June 2017 / Revised: 7 August 2017 / Accepted: 14 September 2017 / Published: 18 September 2017
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

High-voltage direct current (HVDC) lines with line-commutated converter (LCC) are being increasingly employed to transmit bulk wind power over long distance. However, this may cause the sub-synchronous torsional interaction (SSTI) between the wind farms and the LCC-HVDC system. The SSTI characteristics of wind farms with fixed-speed induction generator (FSIG) wind turbines connected to LCC-HVDC are investigated in this paper. To simplify the calculations, a modular modeling method is proposed for building the small-signal mathematical model of the investigated system. Small-signal analysis, participation factor analysis, and impact of dominant factors analysis are then applied to investigate the SSTI characteristics under different operating conditions. Three oscillation modes associated with the SSTI are identified in the entire system through small-signal and participation factor analysis, comprising two torsional modes and an electromechanical mode. Impact of dominant factors analysis shows that the system becomes less stable as the wind farm capacity grows and the distance between FSIG wind farm and the rectifier station increases. Moreover, the above analysis suggests that wind farms with FSIG connected to LCC-HVDC lines may not cause unstable SSTI. The electromagnetic transient simulations based on PSCAD/EMTDC (Power Systems Computer-Aided Design/Electromagnetic Transients including DC) verify these results. View Full-Text
Keywords: wind power; fixed-speed induction generator (FSIG); LCC-HVDC; subsynchronous torsional interaction (SSTI); small-signal analysis wind power; fixed-speed induction generator (FSIG); LCC-HVDC; subsynchronous torsional interaction (SSTI); small-signal analysis
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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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Gao, B.; Zhang, R.; Li, R.; Yu, H.; Zhao, G. Subsynchronous Torsional Interaction of Wind Farms with FSIG Wind Turbines Connected to LCC-HVDC Lines. Energies 2017, 10, 1435.

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