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In practice, the ignition angel and extinction angel of a converter often deviate from the given value for various reasons. As is known, this situation tends to result in the increase of characteristic harmonic amplitudes in AC/DC side of the converter. As a result, this will do much harm to the devices of power systems and increase the power consumption. In this paper, the harmonic expressions of AC/DC side are linearized and the fuzzy control theory is adopted to form the control strategy to modify the ignition angel Â¿ and extinction angel Â¿ in order to decrease the 5th characteristic harmonics in rectifier side and the 6th in inverter side. The simulation results in two-generator system show that this method can actually control the characteristic harmonic amplitudes of current and voltage within a certain boundary.