Impact of a direct-drive permanent magnet generator (DDPMG) wind turbine system on power system oscillations

The increase of the large scale wind power integration have affected many aspects of power systems operation and behaviors. This paper focuses on the impact of a grid-connected direct-drive permanent magnet generator (DDPMG) wind turbine system on damping of power systems oscillations. In this paper, a detailed model of a DDPMG with controllers which is suitable for the small signal stability analysis is presented. The state-space equations of a two-machine system have been derived to illustrate the mode decouple characteristic between a DDPMG wind system and power system and the insight meaning of this decouple concept has been clarified by theoretical analysis. The modal analysis technique has been adopted to reveal the inherent damping characteristics of a DDPMG wind turbine system and the impact of system parameters on stability, thereby to confirm the conclusions of the theoretical analysis. The work can also offer the information for improving the stability of the system effectively.

[1]  J. G. Slootweg,et al.  The impact of large scale wind power generation on power system oscillations , 2003 .

[2]  M.J. Gibbard,et al.  Effect of wind generation on small-signal stability — A New Zealand Example , 2008, 2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century.

[3]  Jacob Østergaard,et al.  On Small-Signal Stability of Wind Power System with Full-Load Converter Interfaced Wind Turbines , 2010 .

[4]  G. J. Rogers,et al.  A fundamental study of inter-area oscillations in power systems , 1991 .

[5]  S. Singh,et al.  A Modified TLS-ESPRIT-Based Method for Low-Frequency Mode Identification in Power Systems Utilizing Synchrophasor Measurements , 2011, IEEE Transactions on Power Systems.

[6]  M. Chinchilla,et al.  Control of permanent-magnet generators applied to variable-speed wind-energy systems connected to the grid , 2006, IEEE Transactions on Energy Conversion.

[7]  Zhe Chen,et al.  Flicker Mitigation by Active Power Control of Variable-Speed Wind Turbines With Full-Scale Back-to-Back Power Converters , 2009, IEEE Transactions on Energy Conversion.

[8]  Poul Ejnar Sørensen,et al.  Dynamic wind turbine models in power system simulation tool DIgSILENT , 2000 .

[9]  Jacob Østergaard,et al.  Small-Signal Stability Analysis of Full-Load Converter Interfaced Wind Turbines , 2009 .

[10]  Kjetil Uhlen,et al.  Large‐scale wind power integration in Norway and impact on damping in the Nordic grid , 2005 .

[11]  V. Akhmatov.  Analysis of Dynamic Behaviour of Electric Power Systems with Large Amount of Wind Power , 2003 .

[12]  P. Rodriguez,et al.  Control of Full-Scale Converter based Wind Power Plants for damping of low frequency system oscillations , 2011, 2011 IEEE Trondheim PowerTech.

[13]  Vijay Vittal,et al.  Impact of increased penetration of DFIG based wind turbine generators on transient and small signal stability of power systems , 2009, IEEE PES General Meeting.