Control of AC-DC-AC converter under unbalanced and distorted input conditions

This paper investigates problems of grid voltage distortions and their influence on AC-DC-AC converter. A specific control algorithm is presented, which minimizes influence of voltage dips and higher harmonics on the system. Requirements for control of the Line (Grid) Side Converter (LSC) and Machine (Generator) Side Converter (MSC) are discussed. Effectiveness of proposed control scheme is verified with simulations and experimentally on 3kW model. Solution is dedicated to Variable Speed Energy Systems (VSEGS) connected to high impedance grid, particularly wind farms or ocean wave energy converters such as WaveDragon MW.

[1]  S. Cobreces,et al.  Fast harmonics compensation in VSCs connected to the grid by synchronous-frame generalized integrators , 2005, Proceedings of the IEEE International Symposium on Industrial Electronics, 2005. ISIE 2005..

[2]  P. Granjon,et al.  Classification and characterization of three phase voltage dips by space vector methodology , 2005, 2005 International Conference on Future Power Systems.

[3]  Yousheng Wang,et al.  Digital harmonic acquisition with delay time compensation based on the improved d-q transformation , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[4]  M.H.J. Bollen,et al.  Mitigation of voltage dips through distributed generation systems , 2003, IEEE Transactions on Industry Applications.

[5]  Marian P. Kazmierkowski,et al.  DIRECT POWER AND TORQUE CONTROL SCHEME FOR SPACE VECTOR MODULATED AC/DC/AC CONVERTER-FED INDUCTION MOTOR , 2006 .

[6]  Johan Enslin,et al.  A customer oriented approach to the classification of voltage dips , 2005 .

[7]  Jens Peter Kofoed,et al.  The Wave Energy Challenge: the Wave Dragon case , 2005 .

[8]  Antti J. Koivo,et al.  Nonlinear predictive control with application to manipulator with flexible forearm , 1999, IEEE Trans. Ind. Electron..

[9]  Hong-Seok Song,et al.  Dual current control scheme for PWM converter under unbalanced input voltage conditions , 1999, IEEE Trans. Ind. Electron..

[10]  Marian P. Kazmierkowski,et al.  Simple direct power control of three-phase PWM rectifier using space-vector modulation (DPC-SVM) , 2004, IEEE Transactions on Industrial Electronics.