Design of a Transformerless Shunt Hybrid Filter Integrated into a Three-Phase Diode Rectifier

This paper describes design and performance of a transformerless shunt hybrid filter integrated into a three-phase diode rectifier. The hybrid filter consists of a three-phase passive filter tuned to the 7th-harmonic frequency, and a small-rated active filter based on a three-phase voltage-source PWM converter. The validity of the system design is confirmed by experimental results obtained from a 400-V, 15-kW laboratory system. The experimental results show that the active filter plays an essential role in reducing supply harmonic currents. The THD (total harmonic distortion) of the supply current gets less than 5%. Moreover, the hybrid filter provides satisfactory transient performance as a result of having achieved an optimal design of circuit and control parameters including the dc capacitor voltage and feedback gains of the active filter, along with the cut-off frequency of high-pass filters for harmonic extraction.

[1]  S. Srianthumrong,et al.  A medium-voltage transformerless AC/DC power conversion system consisting of a diode rectifier and a shunt hybrid filter , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[2]  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.

[3]  Hirofumi Akagi,et al.  Instantaneous Reactive Power Compensators Comprising Switching Devices without Energy Storage Components , 1984, IEEE Transactions on Industry Applications.

[4]  David A. Torrey,et al.  A passive series, active shunt filter for high power applications , 2001 .

[5]  H. Akagi,et al.  A new approach to harmonic compensation in power systems , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[6]  Duro Basic,et al.  Harmonic filtering of high-power 12-pulse rectifier loads with a selective hybrid filter system , 2001, IEEE Trans. Ind. Electron..

[7]  Hirofumi Akagi,et al.  Comparisons in circuit configuration and filtering performance between hybrid and pure shunt active filters , 2003, 38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003..

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

[9]  K. Al-Haddad,et al.  Digital implementation of a new type of hybrid filter with simplified control strategy , 1999, APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285).

[10]  Hirofumi Akagi,et al.  Active Harmonic Filters , 2005, Proceedings of the IEEE.

[11]  V. S. Ramsden,et al.  Hybrid filter control system with adaptive filters for selective elimination of harmonics and interharmonics , 2000 .

[12]  H. Akagi,et al.  A 6.6-kV transformerless shunt hybrid active filter for installation on a power distribution system , 2005, IEEE Transactions on Power Electronics.

[13]  M. Kumazawa,et al.  Development of active filter with series resonant circuit , 1988, PESC '88 Record., 19th Annual IEEE Power Electronics Specialists Conference.