Mitigation method of 3rd-harmonic voltage for a three-phase four-wire distribution system based on a series active filter for the neutral conductor

This paper proposes a series active filter for mitigation of the 3rd-harmonic voltage in a three-phase four-wire power distribution system in a building. The active filter which consists of a single-phase inverter can suppress the harmonic voltage of the system. The active filter is characterized by acting not only as a capacitor but also as a resistor for the 3rd-harmonic components. A Hilbert transformer is applied to the controller of the active filter in order to realize the accurate 3rd-harmonic detection on a single-phase active filter. Measurement results of harmonic distortion of source voltage in a building are also shown in this paper. It is clarified in a simulation and experiment that the active filter can suppress the 3rd-harmonic voltage without increasing neutral conductor current.

[1]  Makoto Saitou,et al.  A Novel Control Method on Single Phase Grid Connectable Inverter with Hilbert Transformer , 2001 .

[2]  T. Shimizu,et al.  Generalized theory of instantaneous active and reactive powers in single-phase circuits based on Hilbert transform , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[3]  Po-Tai Cheng,et al.  Design of a neutral harmonic mitigator for three-phase four-wire distribution systems , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

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

[5]  Mauricio Aredes,et al.  New control algorithms for series and shunt three-phase four-wire active power filters , 1995 .

[6]  A. Nabae,et al.  A series active capacitance for compensating voltage drops caused by source impedances in power systems , 1997, PESC97. Record 28th Annual IEEE Power Electronics Specialists Conference. Formerly Power Conditioning Specialists Conference 1970-71. Power Processing and Electronic Specialists Conference 1972.

[7]  John A. Orr,et al.  A survey of harmonic voltages and currents at the customer's bus , 1993 .

[8]  Jih-Sheng Lai,et al.  Effectiveness of harmonic mitigation equipment for commercial office buildings , 1996 .

[9]  Mauricio Aredes,et al.  Three-phase four-wire shunt active filter control strategies , 1997 .