Browse > Article
http://dx.doi.org/10.6113/JPE.2013.13.3.469

Control Strategy for Three-Phase Grid-Connected Converters under Unbalanced and Distorted Grid Voltages Using Composite Observers  

Nguyen, Thanh Hai (Dept. of Electrical Engineering, Yeungnam University)
Lee, Dong-Choon (Dept. of Electrical Engineering, Yeungnam University)
Publication Information
Journal of Power Electronics / v.13, no.3, 2013 , pp. 469-478 More about this Journal
Abstract
This paper proposes a novel scheme for the current controller for the grid-side converter (GSC) of permanent-magnet synchronous generator (PMSG) wind turbines to eliminate the high-order harmonics in the grid currents under grid voltage disturbances. The voltage unbalance and harmonics in three-phase systems cause grid current distortions. In order to mitigate the input current distortions, multi-loop current controllers are applied, where the positive-sequence component is regulated by proportional-integral (PI) controllers, and the negative-sequence and high-order harmonic components are regulated by proportional-resonance (PR) controllers. For extracting the positive/negative-sequence and harmonic components of the grid voltages and currents without a phase delay or magnitude reduction, composite observers are applied, which give faster and more precise estimation results. In addition, an active damping method using PR controllers to damp the grid current component of the resonant frequency is employed to improve the operating stability of VSCs with inductor-capacitor-inductor (LCL) filters. The validity of the proposed method is verified by simulation and experimental results.
Keywords
Active damping; Composite observer; Grid converter; PMSG; PR controller; Voltage disturbances;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 T. H. Nguyen and D.-C. Lee, "Control of three-phase grid converters based on composite observer for unbalanced and distorted grid voltage," in Proc. IEEE ISIE, May. 2012, pp. 1874-1879.
2 S. Alepuz, S. B. Monge, J. Bordonau, J. A. M. Velasco, C. A. Silva, J. Pontt, and J. Rodriquez, "Control strategies based on symmetrical components for grid-connected converters under voltage dips," IEEE Trans. Ind. Electron., Vol. 56, No. 6, pp. 2162-2173, Jun. 2009.   DOI   ScienceOn
3 K. Hatua, A. K. Jain, D. Banerjee, and V. T. Ranganathan, "Active damping of output LC filter resonance for vectorcontrolled VSI-fed AC motor drives," IEEE Trans. Ind. Electron., Vol. 59, No. 1, pp. 334-342, Jan. 2012.   DOI   ScienceOn
4 D.-E. Kim and D.-C. Lee, "Feedback linearization control of three-phase UPS inverter systems," IEEE Trans. Ind. Electron., Vol. 57, No. 3, pp. 963-968, Mar. 2010.
5 M. Liserre, R. Teodorescu, and F. Blaabjerg, "Stability of photovoltaic and wind turbine grid-connected inverters for a large set of grid impedance values," IEEE Trans. Power. Electron., Vol. 21, No. 1, pp. 263-272, Jan. 2006.   DOI   ScienceOn
6 J. Dannehl, M. Liserre, and F. Wilhelm, "Filter-based active damping of voltage source converters with LCL filters," IEEE Trans. Ind. Electron., Vol. 58, No. 8, pp. 3623-3632, Aug. 2011.   DOI   ScienceOn
7 X. Zhang, W. Pan, Y. Liu, and D. Xu, "Improved grid voltage control strategy for wind farm with DFIG connected to distribution networks," Journal of Power Electronics, Vol. 12, No. 3, pp. 495-502, May 2012.   DOI   ScienceOn
8 H.-S. Song and K. Nam, "Dual current control scheme for PWM converter under unbalanced input voltage conditions," IEEE Trans. Ind. Electron., Vol. 46, No. 5, pp. 953-959, Oct. 1999.   DOI   ScienceOn
9 J. Dannehl, C. Wessels, and F. Wilhelm, "Limitations of voltage-oriented PI current control of grid-connected PWM rectifiers with LCL filters," IEEE Trans. Ind. Electron., Vol. 56, No. 2, pp. 380-388, Feb. 2009.   DOI   ScienceOn
10 X. Wang, X. Ruan, S. Liu, and C. K. Tse, "Full feedforward of grid voltage for grid-connected inverter with LCL filter to suppress current distortion due to grid voltage harmonics," IEEE Trans. Power. Electron., Vol. 25, No. 12, pp. 3119-3127, Dec. 2010.   DOI   ScienceOn
11 Y. A. R. I. Mohamed, "Mitigation of dynamic, unbalanced, and harmonic voltage disturbances using grid-connected inverters with LCL filter," IEEE Trans. Ind. Electron., Vol. 58, No. 9, pp. 3914-3924, Sep. 2011.   DOI   ScienceOn
12 K. Selvajyothi and P. A. Janakiraman, "Extraction of harmonics using composite observers," IEEE Trans. Power Del., Vol. 23, No. 1, pp. 31-40, Jan. 2008.   DOI   ScienceOn
13 E. Twining and D. G. Homles, "Grid current regulation of a three-phase voltage source inverter with an LCL input filter," IEEE Trans. Power. Electron., Vol. 18, No. 3, pp. 888-895, May. 2003.   DOI   ScienceOn
14 F. Liu, Y. Zhou, S. Duan, J. Yin, and F. Liu, "Parameter design of a two-current-loop controller used in a gridconnected inverter system with LCL filter," IEEE Trans. Ind. Electron., Vol. 56, No. 11, pp. 4483-4491, Nov. 2009.   DOI   ScienceOn
15 K. Lee, T. M. Jahns, T. A. Lipo, V. Blasko, and R. D. Lorenz, "Observer-based control methods for combined source-voltage harmonics and unbalance disturbances in PWM voltage-source converters," IEEE Trans. Ind. Appl., Vol. 45, No. 6, pp. 2010-2021, Nov./Dec. 2009.   DOI   ScienceOn
16 R. Data and V. T. Ranganathan, "A method of tracking the peak power points for a variable speed wind energy conversion system," IEEE Trans. Energy Convers., Vol. 18, No. 1, pp. 163-168, Mar. 2003.   DOI   ScienceOn
17 K. Selvajyothi and P. A. Janakiraman, "Reduction of voltage harmonics in single phase inverters using composite observers," IEEE Trans. Power Del., Vol. 25, No. 2, pp. 1045-1057, Apr. 2010.   DOI   ScienceOn
18 T. H. Nguyen, D.-C. Lee, and S.-G. Lee, "Sinusoidal current control of single-phase PWM converters under voltage source distortion using composite observer," Trans. of KIPE, Vol. 16, No. 5, pp. 466-476, Oct. 2011.   과학기술학회마을   DOI   ScienceOn
19 S.-K. Sul, Control of electric machine drive systems, Wiley, 2011.
20 A. O. Ibrahim, T. H. Nguyen, D.-C. Lee, and S.-C. Kim, "A fault ride-through technique of DFIG wind turbine systems using dynamic voltage restorers," IEEE Trans. Energy Convers., Vol. 26, No. 3, pp. 871-882, Sep. 2011.   DOI   ScienceOn
21 P. Rodriguez, J. Pou, J. Bergas, J. I. Candela, R. P. Burgos, and D. Boroyevich, "Decoupled double synchronous reference frame PLL for power converters control," IEEE Trans. Power Electron., Vol. 22, No. 2, pp. 584-592, Mar. 2007   DOI   ScienceOn