Implementation and performance of automatic gain adjustment in a shunt-active filter for harmonic damping throughout a power distribution system

This paper discusses automatic gain adjustment in a fully-digital-controlled shunt active filter. This is the first step in cooperative control of the multiple active filters based on voltage detection for harmonic damping throughout power distribution systems. In general, the active filter should be equipped with an optimal control gain corresponding to the characteristic impedance of a distribution line. However, it is difficult to know circuit parameters of a real distribution line having various shunt capacitors and loads. Therefore, a main purpose of the gain adjustment is to make the active filter damp out harmonic propagation without considering the circuit parameters. In addition, the gain adjustment can reduce the compensating currents and losses in the active filter, and moreover it can avoid over-damping performance. Experiment results obtained from a 200-V, 20-kW laboratory system verify the effectiveness of the active filter equipped with automatic gain adjustment.

[1]  W. M. Grady,et al.  Minimizing harmonic voltage distortion with multiple current-constrained active power line conditioners , 1997 .

[2]  Takamu Genji,et al.  Development and proof examination result of Active Filter for Power Distribution Systems , 2000 .

[3]  S. B. Dewan,et al.  A robust digital current control method for active power filters , 2000 .

[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]  Hirofumi Akagi.  Control Strategy and Site Selection of a Shunt Active Filter for Damping of Harmonic Propagation in Power Distribution Systems , 1997 .

[6]  S. Buso,et al.  Robust dead-beat current control for PWM rectifiers and active filters , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[7]  Takamu Genji,et al.  Suppresion Performance Analysis of Active Filter by Neural Network Control with Voltage Detection on Distribution Network , 1999 .

[8]  Atsuo Kawamura,et al.  Dead beat microprocessor control of PWM inverter for sinusoidal output waveform synthesis , 1985, 1985 IEEE Power Electronics Specialists Conference.

[9]  Hirofumi Akagi,et al.  Control and performance of a fully-digital-controlled shunt active filter for installation on a power distribution system , 2002 .

[10]  Tien-Ting Chang,et al.  An efficient approach for reducing harmonic voltage distortion in distribution systems with active power line conditioners , 2000 .

[11]  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).