Observer based reference current generation for a three-phase shunt active power filter

In this paper, a new observer-based method, which generates the current reference for a three-phase shunt active power filter (SAPF), is presented. This technique is useful for active power filters and capable to eliminate harmonics and compensate reactive power simultaneously. First, the fundamental active current to identify is modeled in the form of a generating process. The other harmonic components appearing in the load current, as well as the basic noises inherent with the signal measurements, are all considered as noises for the observer. The goal of the extraction consists in filtering the noise in order to recover the active fundamental current. The filtering is carried out using an observer on the generating model. The dynamics of the extraction will depend on the speed of convergence of the observer. Simulation results are presented, showing that the method is feasible and the results are acceptable.

[1]  P. Mehta,et al.  Active power filters: a review , 2000 .

[2]  Hirofumi Akagi,et al.  New trends in active filters for power conditioning , 1996 .

[3]  F. Peng.  Harmonic sources and filtering approaches , 2001 .

[4]  J. Slotine,et al.  On Sliding Observers for Nonlinear Systems , 1986, 1986 American Control Conference.

[5]  Fang Zheng Peng,et al.  Application issues of active power filters , 1998 .

[6]  Peter Wolfs,et al.  Systematic identification and review of hybrid active filter topologies , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[7]  M. Machmoum,et al.  Control of a three-phase active power filter with optimized design of the energy storage capacitor , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[8]  F. Fnaiech,et al.  A new control technique based on the instantaneous active current applied to shunt hybrid power filters , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..

[9]  Ned Mohan,et al.  Hybrid-active filtering of harmonic currents in power systems , 1995 .

[10]  Kamal Al-Haddad,et al.  A review of active filters for power quality improvement , 1999, IEEE Trans. Ind. Electron..

[11]  Hirofumi Akagi,et al.  Control Strategy of Active Power Filters Using Multiple Voltage-Source PWM Converters , 1986, IEEE Transactions on Industry Applications.

[12]  Subhashish Bhattacharya,et al.  Flux-based active filter controller , 1995 .