Analytical Design of Passive LCL Filter for Three-phase Two-level Power Factor Correction Rectifiers

This paper has presented a comprehensive analytical method for designing LCL filter of a three-phase power factor correction rectifier (PFC). The method is explained by the converter current and the voltage behavior. The converter current ripple determines all the filter parameters and defines a suitable margin for them. A general equation is derived for the maximum converter current ripple which is applicable for sinusoidal PWM and third-harmonic injection PWM. The analysis is performed for unity power factor. It is proved that for modulation index higher than 0.845 the maximum current ripple occurs at zero crossing otherwise it appears at peak current. Consequently. the maximum charge of the filter capacitor is analytically obtained. Unlike the normal method on the literature in which the maximum filter capacitance is defined by absorbed reactive power.

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