Abstract-At present, there are many methods to improve the compensation performance of active power filter (APF). However, to improve the reliability of APF, dead-time between two IGBT switches in the same bridge must be set large enough to guarantee the IGBT operating safely, which will impact the output performance of APF. This paper proposes a modeling method on a specific order harmonic to investigate the dead-time's influence to the compensation performance of APF. The theoretical analysis is well verified by the simulation results. At last, some methods are recommended to minimize the unexpected effect caused by dead-time.

Abstract. This paper introduces a kind of the harmonic motion curves, which characterized by multi-harmonic component, and the expression form can be divided into two cases: general Cam mechanism and indexing Cam mechanism. Combined with the instance, it compares the characteristic values with other commonly motion curves to embody the advantages of the harmonic motion. Furthermore, respectively analyze the effect of the harmonic order number on the general Cam curve, and the relevant parameters of the harmonic motion curves influence on the properties of indexing Cam movement. Finally, obtain some theoretical and practical significance conclusions.

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