Design and Implementation of a Current Controlled Parallel Hybrid Power Filter

This paper deals with the implementation of an indirect current control of parallel hybrid filter system (PHF) with rectifier load to eliminate generated harmonics. The compensation principle, design and PHF implementation are discussed in detail. The proposed control enhances the performance of the passive filters under unbalance situations existing in the passive filters under fault conditions. Moreover, due to limited capacity of VSI a upper limit for such compensation may be imposed by proposed indirect current control based on synchronous reference frame employing decomposition of current in synchronously rotating reference frame (SRF) is used to control PHF. The PHF is controlled using decomposition of load and source currents. The implementation of the control scheme is carried out on dSpace with digital signal processor (DSP) for developed prototype of PHF. Passive filters are developed keeping in view of its operation with PHF, so that, the total harmonic distortion (THD) in the source current gets minimized along with minimized fundamental frequency current sinking through the filter section. The design has been carried out by genetic algorithm (GA), which optimizes the solution for multiple constraints. Operation of PHF under dynamic change of load is also investigated through simulations under MATLAB and through experimentation.

[1]  J.C. Das,et al.  Passive filters - potentialities and limitations , 2003, IEEE Transactions on Industry Applications.

[2]  Hirofumi Akagi,et al.  A hybrid active filter for damping of harmonic resonance in industrial power systems , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[3]  H. Akagi,et al.  A practical approach to harmonic compensation in power systems-series connection of passive and active filters , 1990, Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting.

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

[5]  N. Balbo,et al.  Hybrid active filter for parallel harmonic compensation , 2002 .

[6]  L. Gyugyi,et al.  Active ac power filters , 1976 .

[7]  Po-Tai Cheng,et al.  Hybrid solutions for improving passive filter performance in high power applications , 1997 .

[8]  D. A. Gonzalez,et al.  Design of Filters to Reduce Harmonic Distortion in Industrial Power Systems , 1987, IEEE Transactions on Industry Applications.

[9]  José R. Espinoza,et al.  Improving passive filter compensation performance with active techniques , 2003, IEEE Trans. Ind. Electron..

[10]  Juan Dixon,et al.  A simple control scheme for hybrid active power filter , 2002 .

[11]  B. Singh,et al.  An indirect current control of hybrid power filter for varying loads , 2006, IEEE Transactions on Power Delivery.

[12]  Po-Tai Cheng,et al.  Experimental verification of dominant harmonic active filter (DHAF) for high power applications , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[13]  Jose A. Cobos,et al.  Simplified control strategy for hybrid active filters , 1997, PESC97. Record 28th Annual IEEE Power Electronics Specialists Conference. Formerly Power Conditioning Specialists Conference 1970-71. Power Processing and Electronic Specialists Conference 1972.

[14]  Bor-Ren Lin,et al.  Analysis and operation of hybrid active filter for harmonic elimination , 2002 .