This paper deals with a harmonic compensation method using a synchronous machine with resonant field circuits. Recently, harmonics have become one of the major problems in power systems and a lot of methods of harmonic suppression have been studied. The authors have proposed a new method of harmonic suppression using a synchronous machine excited with the 6th harmonic current. This paper shows that armature inductances for the 5th or 7th harmonics decrease when the field circuits are connected to capacitors resonating at the 6th harmonic. The variations of armature impedances are explained theoretically by Park's equations. The optimal capacitances are selected so as to resonate with field inductances for the short-circuited armature. The experiments to suppress the 5th and 7th harmonics using the synchronous machine are successful.96 SM 363-2 EC A paper recommended and approved by the IEEE Electric Machinery Commlttee of the IEEE Power Engineering Society for presentatlon at the 19% IEEBPES Summer

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