A novel DSP-based adaptive line synchronization system for three-phase utility interface power converters

Fast and accurate phase tracking is essential for the control of three-phase utility interface power converters. Conventional methods are compromises between the tracking errors and dynamic response. This paper proposes that the errors caused by phase unbalance and harmonics cannot be handled alone by the loop filter, whereas they can be minimized through advanced digital signal processing techniques. One solution is the adaptive line synchronization method presented in this paper. The results show superior performance in nonideal and fault conditions. The advantages are verified by simulation and experiments.

[1]  Jin-Woo Ahn,et al.  Digital PLL technique for precise speed control of SR drive , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

[2]  D. C. Hanselman.  Resolver signal requirements for high accuracy resolver-to-digital conversion , 1990 .

[3]  G. Joos,et al.  Series and shunt active power conditioners for compensating distribution system faults , 2000, 2000 Canadian Conference on Electrical and Computer Engineering. Conference Proceedings. Navigating to a New Era (Cat. No.00TH8492).

[4]  V. Blasko,et al.  Operation of a phase locked loop system under distorted utility conditions , 1997 .

[5]  Seung-Ki Sul,et al.  A new phase detecting method for power conversion systems considering distorted conditions in power system , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[6]  Floyd M. Gardner,et al.  Phaselock techniques , 1984, IEEE Transactions on Systems, Man, and Cybernetics.

[7]  G. Joos,et al.  A fast algorithm for voltage unbalance compensation and regulation in faulted distribution systems , 1998, APEC '98 Thirteenth Annual Applied Power Electronics Conference and Exposition.

[8]  K. Nam,et al.  An instantaneous phase angle detection algorithm under unbalanced line voltage condition , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

[9]  G. Joos,et al.  A Dsp-based Real-time Digital Filter For Symmetrical Components , 1993, Proceedings. Joint International Power Conference Athens Power Tech,.

[10]  Robert H. Lasseter,et al.  Statcom controls for operation with unbalanced voltages , 1998 .

[11]  G. Joos,et al.  A novel line synchronization scheme for static power converters , 1989, 15th Annual Conference of IEEE Industrial Electronics Society.