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Many conventional methods focus on reducing the harmful impact of the poor power quality in industrial rectier systems, but they focus more on the harmonic problems of the utility grid than they do on that of the rectier transformer; hence, the rectier transformer would still be adversely aected by harmonic pollution. In order to solve the problem, a ltering rectier transformer is proposed that adopts a harmonic current drainage system that incorporates tertiary winding and tuned harmonic lters. The impedance of the tertiary winding is specially designed and the tuned harmonic lters work together to restrain the harmonic current and give a good performance in the reactive power compensation close to the harmonic source. By deducing the current relationships between the windings of the ltering rectier transformer, the principles of the harmonic suppression and reactive compensation are elaborated. The theoretical analysis shows that if the harmonic current drainage system is out of service, the characteristics of the operation parameters of the ltering rectier transformer are the same as those of the conventional one. While it is in

Operational characteristics of a filtering rectifier transformer for industrial power systems