Stationary Frame Current Control Evaluations for Three-Phase Grid-Connected Inverters with PVR-based Active Damped LCL Filters

- Journal title : Journal of Power Electronics
- Volume 16, Issue 1, 2016, pp.297-309
- Publisher : The Korean Institute of Power Electronics
- DOI : 10.6113/JPE.2016.16.1.297

Title & Authors

Stationary Frame Current Control Evaluations for Three-Phase Grid-Connected Inverters with PVR-based Active Damped LCL Filters

Han, Yang; Shen, Pan; Guerrero, Josep M.;

Han, Yang; Shen, Pan; Guerrero, Josep M.;

Abstract

Grid-connected inverters (GCIs) with an LCL output filter have the ability of attenuating high-frequency (HF) switching ripples. However, by using only grid-current control, the system is prone to resonances if it is not properly damped, and the current distortion is amplified significantly under highly distorted grid conditions. This paper proposes a synchronous reference frame equivalent proportional-integral (SRF-EPI) controller in the αβ stationary frame using the parallel virtual resistance-based active damping (PVR-AD) strategy for grid-interfaced distributed generation (DG) systems to suppress LCL resonance. Although both a proportional-resonant (PR) controller in the αβ stationary frame and a PI controller in the dq synchronous frame achieve zero steady-state error, the amplitude- and phase-frequency characteristics differ greatly from each other except for the reference tracking at the fundamental frequency. Therefore, an accurate SRF-EPI controller in the αβ stationary frame is established to achieve precise tracking accuracy. Moreover, the robustness, the harmonic rejection capability, and the influence of the control delay are investigated by the Nyquist stability criterion when the PVR-based AD method is adopted. Furthermore, grid voltage feed-forward and multiple PR controllers are integrated into the current loop to mitigate the current distortion introduced by the grid background distortion. In addition, the parameters design guidelines are presented to show the effectiveness of the proposed strategy. Finally, simulation and experimental results are provided to validate the feasibility of the proposed control approach.

Keywords

Active damping;LCL filter;PVR-AD scheme;Stability;Synchronous frame equivalent PI;

Language

English

Cited by

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References

1.

F. Blaabjerg, R. Teodorescu, M. Liserre, and A. Timbus, “Overview of control and grid synchronization for distributed power generation systems,” IEEE Trans. Ind. Electron., Vol. 53, No. 5, pp. 1398–1409, Oct. 2006.

2.

P. Sivakumar and M. S. Arutchelvi, “Enhanced controller topology for photovoltaic sourced grid connected inverters under unbalanced nonlinear loading,” Journal of Power Electronics., Vol. 14, No. 2, pp. 369–382, Mar. 2014.

3.

L. Zhang, K. Sun, Y. Xing, and M. Xing, “H6 transformerless full-bridge PV grid-tied inverters,” IEEE Trans. Power Electron., Vol. 29, No. 3, pp. 1229-1238, Mar. 2014.

4.

L. Zhang, K. Sun, H. Hu, and Y. Xing, “A system-level control strategy of photovoltaic grid-tied generation systems for european efficiency enhancement,” IEEE Trans. Power Electron., Vol. 29, No. 7, pp. 3445-3453, Jul. 2014.

5.

J. He and Y. W. Li, “Generalized closed-loop control schemes with embedded virtual impedances for voltage source converters with LC or LCL filters,” IEEE Trans. Power Electron., Vol. 27, No. 4, pp. 1850–1861, Apr. 2012.

6.

S. Guoqiao, Z. Xuancai, Z. Jun, and X. Dehong, “A new feedback method for PR current control of LCL-filter-based grid-connected inverter,” IEEE Trans. Ind. Electron., Vol. 57, No. 6, pp. 2033–2041, Jun. 2010.

7.

J. Dannehl, M. Liserre, and F. W. Fuchs, “Filter-based active damping of voltage source converters with filter,” IEEE Trans. Ind. Electron., Vol. 58, No. 8, pp. 3623–3633, Aug. 2011.

8.

R. Pena-Alzola, M. Liserre, F. Blaabjerg, R. Sebastian, J. Dannehl, and F. W. Fuchs, “Analysis of the passive damping losses in LCL-filter-based grid converters,” IEEE Trans. Power Electron., Vol. 28, No. 6, pp. 2642–2646, Jun. 2013.

9.

R. Beres, X. Wang, F. Blaabjerg, C. L. Bak, and M. Liserre, "Comparative evaluation of passive damping topologies for parallel grid-connected converters with LCL filters," in IEEE Power Electronics Conf., pp. 18-21, May 2014.

10.

J. Xu, S. Xie, and T. Tang, “Active damping-based control for grid-connected LCL-filtered inverter with injected grid current feedback only,” IEEE Trans. Ind. Electron., Vol. 61, No. 9, pp. 4746–4758, Sep. 2014.

11.

C. P. Dick, S. Richter, M. Rosekeit, J. Rolink, and R. W. De Doncker, "Active damping of LCL resonance with minimum sensor effort by means of a digital infinite impulse response filter," in 2007 European Conf. Power Electronics and Applications, pp. 1-8, Sep. 2007.

12.

G. Shen, D. Xu, L. Cao, and X. Zhu, “An improved control strategy for grid-connected voltage source inverters with a LCL filter,” IEEE Trans. Power Electron., Vol. 23, No. 4, pp. 1899–1906, Jul. 2008.

13.

J. Dannehl, F. W. Fuchs, S. Hansen, and P. B. Thøgersen, “Investigation of active damping approaches for PI-based current control of grid-connected pulse width modulation converters with LCL filters,” IEEE Trans. Ind. Appl., Vol. 46, No. 4, pp. 1509–1517, Jul./Aug. 2010.

14.

C. Bao, X. Ruan, X. Wang, W. Li, D. Pan, and K. Weng, “Step-by-step controller design for LCL-type grid-connected inverter with capacitor–current-feedback active-damping,” IEEE Trans. Power Electron., Vol. 29, No. 3, pp. 1239–1253, Mar. 2014.

15.

S. G. Parker, B. P. McGrath, and D. G. Holmes, “Regions of active damping control for LCL filters,” IEEE Trans. Ind. Appl., Vol. 50, No. 1, pp. 424–432, Jan./Feb. 2014.

16.

M. Hanif, V. Khadkikar, W. Xiao, and J. L. Kirtley, “Two degrees of freedom active damping technique for filter-based grid connected PV systems,” IEEE Trans. Ind. Electron., Vol. 61, No. 6, pp. 2795–2803, Jun. 2014.

17.

Y. Lei, W. Xu, C. Mu, and Z. Zhao, “New hybrid damping strategy for grid-connected photovoltaic inverter with LCL filter,” IEEE Trans. Appl. Supercond., Vol. 24, No. 5, pp. 361–368, Oct. 2014.

18.

J. C. Vasquez, J. M. Guerrero, M. Savaghebi, J. Eloy-Garcia, and R. Teodorescu, “Modeling, analysis, and design of stationary-reference-frame droop-controlled parallel three-phase voltage source inverters,” IEEE Trans. Ind. Electron., Vol. 60, No. 4, pp. 1271–1280, Apr. 2013.

19.

N. He, D. Xu, Y. Zhu, J. Zhang, G. Shen, Y. Zhang, J. Ma, and C. Liu, “Weighted average current control in a three-phase grid inverter with an LCL filter,” IEEE Trans. Power Electron., Vol. 28, No. 6, pp. 2785–2797, Jun. 2013.

20.

X. Yuan, W. Merk, H. Stemmler, and J. Allmeling, “Stationary-frame generalized integrators for current control of active power filters with zero steady-state error for current harmonics of concern under unbalanced and distorted operating conditions,” IEEE Trans. Ind. Appl., Vol. 38, No. 2, pp. 523–532, Mar./Apr. 2002.

21.

H. Yi, F. Zhuo, Y. Li, Y. Zhang, and W. Zhan, “Comparison analysis of resonant controllers for current regulation of selective active power filter with mixed current reference,” Journal of Power Electronics., Vol. 13, No. 5, pp. 861–876, Sep. 2013.

22.

Y. Jia, J. Zhao, and X. Fu, “Direct grid current control of LCL filtered grid-connected inverter mitigating grid voltage disturbance,” IEEE Trans. Power Electron., Vol. 29, No. 3, pp. 1532–1541, Mar. 2014.

23.

M. A. Abusara, S. M. Sharkh, and P. Zanchetta, “Control of grid-connected inverters using adaptive repetitive and proportional resonant schemes,” Journal of Power Electronics, Vol. 15, No. 2, pp. 518–529, Mar. 2015.

24.

X. Bao, F. Zhuo, Y. Tian, and P. Tan, “Simplified feedback linearization control of three-phase photovoltaic inverter with an LCL filter,” IEEE Trans. Power Electron., Vol. 28, No. 6, pp. 2739–2752, Jun. 2013.

25.

T. Yi, L. Poh Chiang, W. Peng, C. Fook Hoong, and G. Feng, “Exploring inherent damping characteristic of LCL-filters for three-phase grid-connected voltage source inverters,” IEEE Trans. Power Electron., Vol. 27, No. 3, pp. 1433–1443, Mar. 2012.

26.

C. Zou, Liu, S. Duan, and R. Li, “Stationary frame equivalent model of proportional-integral controller in dq synchronous frame,” IEEE Trans. Power Electron., Vol. 29, No. 9, pp. 4461–4465, Sep. 2014.

27.

G. Shen, X. Zhu, J. Zhang, and D. Xu, “A new feedback method for PR current control of LCL-filter-based grid-connected inverter,” IEEE Trans. Ind. Electron., Vol. 57, No. 6, pp. 2033–2041, Jun. 2010.

28.

D. N. Zmood and D. G. Holmes, “Stationary frame current regulation of PWM inverters with zero steady-state error,” IEEE Trans. Power Electron., Vol. 18, No. 3, pp. 814–822, May. 2003.

29.

C. Zou, B. Liu, and R. Li, “Influence of delay on system stability and delay optimization of grid-connected inverters with LCL filter,” IEEE Trans. Ind. Inform., Vol. 10, No. 3, pp. 1775–1784, Aug. 2014.

30.

J. Xu, S. Xie, and T. Tang, “Evaluations of current control in weak grid case for grid-connected LCL-filtered inverter,” IET Power Electronics, Vol. 6, No. 2, pp. 227–234, Feb. 2013.

31.

D. A. Timbus, M. Liserre, R. Teodorescu, P. Rodriguez, and F. Blaabjerg, “Evaluation of current controller for distributed power generation systems,” IEEE Trans. Power Electron., Vol. 24, No. 3, pp. 654–664, Mar. 2009.

32.

T. Abeyasekera, C. M. Johnson, D. J. Atkinson, and M. Armstrong, “Suppression of line voltage related distortion in current controlled grid connected inverters,” IEEE Trans. Power Electron., Vol. 20, No. 6, pp. 1393–1401, Nov. 2005.