Control of a Doubly Fed Induction Generator at Grid Voltage Imbalance

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Properties and control of a doubly fed induction machine operating under unbalanced grid voltage conditions have been presented. The proposed method does not include symmetrical sequences decomposition and is realized in a rotating frame not synchronized either with the grid voltage vector or with the stator flux vector. The method uses a reference torque and the reference q component of instantaneous power for calculation of the reference stator current. Next, calculation of magnetizing current for a given unbalanced grid voltage is used to assign the reference rotor current. Due to the fact that the reference current contains both a positive and a negative sequence, a proportional-integral-resonant controller is used. The main control target is the non-oscillatory waveform of torque, whereas other separate strategies like symmetrical stator current or sinusoidal rotor current can be easily obtained by adequate filtration of the reference control signals of the stator or rotor currents, respectively. The simulation results of the 2 MW model have been presented for a doubly fed induction generator as well as the results of laboratory tests with the use of a small scale 7.5 kW machine.

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  • [1] Liserre M. Cardenas R. Molinas M. Rodriguez J. Overview of multi-MW wind turbines and wind parks IEEE Trans. Ind. Electron. 2011 58(4) 1081–1095.

  • [2] Müller S. Deicke M. De Doncker R. Doubly fed induction generator systems for wind turbines Ind. Appl. Mag. IEEE 2002 8(3) 26–33.

  • [3] Kuwabara T. Shibuya A. Furuta H. Kita E. Mitsuhashi K. Design and dynamic response characteristics of 400 MW adjustable speed pumped storage unit for Ohkawachi Power Station IEEE Trans. Energy Convers. 1996 11(2) 376–382.

  • [4] Waris T. Nayar C.V. Variable speed constant frequency diesel power conversion system using doubly fed induction generator (DFIG) 2008 IEEE Power Electronics Specialists Conference 2008 2728–2734.

  • [5] Akagi H. Sato H. Control and performance of a doubly-fed induction machine intended for a flywheel energy storage system IEEE Trans. Power Electron. 2002 17(1) 109–116.

  • [6] Pannell G Atkinson D.J.Zahawi B. Minimum-threshold crowbar for a fault-ride-through grid-codecompliant dfig wind turbine IEEE Trans. En. Conv. 2010 25(3) 750–759.

  • [7] Geng H. Liu C. Yang G. LVRT capability of DFIG-based WECS under asymmetrical grid fault condition IEEE Trans. Ind. Electron. 2013 60(6) 2495–2509.

  • [8] Santos-Martin D. Rodriguez-Amenedo J.L. Arnalte S. Direct power control applied to doubly fed induction generator under unbalanced grid voltage conditions IEEE Trans. Power Electron. 2008 23(5) 2328–2336.

  • [9] Kim Y. Lee D. Active and reactive power control of DFIG for wind energy conversion under unbalanced grid voltage 5th Int. Power Electron. Motion Control Conf. IPEMC ’06 2006.

  • [10] Qiao W. Harley R.G. Improved control of DFIG wind turbines for operation with unbalanced network voltages Conf. Rec. IAS Ann. Meet. IEEE Ind. Appl. Soc. 2008 1–7.

  • [11] Xu L. Wang Y. Dynamic modeling and control of DFIG-based wind turbines under unbalanced network conditions IEEE Trans. Power Syst. 2007 22(1) 314–323.

  • [12] Song Y. Nian H. Modularized control strategy and performance analysis of DFIG system under unbalanced and harmonic grid voltage IEEE Trans. Power Electron. 2015 30(9) 4831–4842.

  • [13] Lascu C. Asiminoaei L. Boldea I. Blaabjerg F. High performance current controller for selective harmonic compensation in active power filters IEEE Trans. Power Electron. 2007 22(5) 1826–1835.

  • [14] Song Y. Zhou D. Blaabjerg F. Impedance based analysis of DFIG stator current unbalance and distortion suppression strategies Industrial Electron. Conf. 2016 4151–4157.

  • [15] Hu J. He Y. Xu L. Williams B.W. Improved control of DFIG systems during network unbalance using PI-R current regulators IEEE Trans. Ind. Electron. 2009 56(2) 439–451.

  • [16] Santos-Martin D. Rodriguez-Amenedo J.L. Arnalte S. Direct power control applied to doubly fed induction generator under unbalanced grid voltage conditions IEEE Trans. Power Electron. 2008 23(5) 2328–2336.

  • [17] Hu J. Zhu J. Dorrell D.G. Predictive direct power control of doubly fed induction generators under unbalanced grid voltage conditions for power quality improvement IEEE Trans. Sustain. Energy 2015 6(3) 943–950.

  • [18] Shang L. Hu J. Sliding-mode-based direct power control of grid-connected wind-turbine-driven doubly fed induction generators under unbalanced grid voltage conditions IEEE Trans. En. Conv. 2012 27(2) 362–373.

  • [19] Zhou P. He Y. Su D. Improved direct power control of a DFIG-based wind turbine during network unbalance IEEE Trans. Power Electron. 2009 24(11) 2465–2474.

  • [20] Nian H. Song Y. Zhou P. He Y. Improved direct power control of a wind turbine driven doubly fed induction generator during transient grid voltage unbalance IEEE Trans En. Conv. 2011 26(3) 976–986.

  • [21] Akagi H. Kanazawa Y. Nabae A. Generalized theory of the instantaneous reactive power in threephase circuits Int. Power Electronics Conf. 1983 1375–1386.

  • [22] Luszczyk T. Iwanski G. Comparison of decoupling structures in a rotor current control of doubly fed induction generator 8th Int. Conf. Exhib. on Ecological Vehicles and Renewable Energies EVER ’13 2013 Monte Carlo Monaco 1–5.

  • [23] Yepes A.G. Freijedo F.D. Lopez Ó. Doval-Gandoy J. High-performance digital resonant controllers implemented with two integrators IEEE Trans. Power Electron. 2011 26(2) 563–576.

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