A Dynamic Tuning Method for Distributed Active Filter Systems

The dramatic growth of power electronics applications has led to serious harmonic pollutions in the power system. The phenomenon of harmonic resonance resulting in severe voltage distortion has been reported. Various suppression techniques have been proposed to resolve this problem. The distributed active-filter system (DAFS) is a more effective solution by deploying multiple shunt active filter units (AFUs) in the system to cooperatively damp the harmonic resonance. This paper proposes a dynamic tuning scheme for the DAFS to enhance its filtering performance. Based on the measured voltage harmonic distortion at the installation point, each AFU can dynamically adjust its own filtering volt-ampere (VA) capacity to maintain the total harmonic distortion of the line voltage at an allowable level. The proposed strategy can be integrated with the droop control between the conductance command and VA consumption so that the harmonic-filtering workload is evenly shared among various AFUs. The operation principles and dynamic analyses are presented in this paper, and test results based on simulations and experiments validate the proposed approach.

[1]  Gene F. Franklin,et al.  Feedback Control of Dynamic Systems , 1986 .

[2]  Thomas G. Habetler,et al.  A space vector-based rectifier regulator for AC/DC/AC converters , 1993 .

[3]  E. J. Currence,et al.  Harmonic resonance at a medium sized industrial plant , 1994 .

[4]  H. Akagi,et al.  A shunt active filter based on voltage detection for harmonic termination of a radial power distribution line , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[5]  K. Wada,et al.  Considerations of a shunt active filter based on voltage detection for installation on a long distribution feeder , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[6]  H. Fujita,et al.  Implementation and performance of cooperative control of shunt active filters for harmonic damping throughout a power distribution system , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[7]  Hirofumi Akagi,et al.  Implementation and performance of automatic gain adjustment in a shunt-active filter for harmonic damping throughout a power distribution system , 2002 .

[8]  Po-Tai Cheng,et al.  Distributed active filter systems (DAFS): a new approach to power system harmonics , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[9]  Tzung-Lin Lee,et al.  Design of a new cooperative harmonic filtering strategy for the distributed generation systems , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[10]  Tzung-Lin Lee,et al.  Analysis of Harmonic Damping Effect of the Distributed Active Filter System , 2006 .

[11]  Tzung-Lin Lee,et al.  Distributed Active Filter Systems (DAFSs): A New Approach to Power System Harmonics , 2006, IEEE Transactions on Industry Applications.

[12]  Tzung-Lin Lee,et al.  Design of a New Cooperative Harmonic Filtering Strategy for Distributed Generation Interface Converters in an Islanding Network , 2007, IEEE Transactions on Power Electronics.