Abstract
In most voltage-fed inverter drives, three-phase diode bridge rectifiers with a filter capacitor at the DC side are often used. In this type of rectifier, the harmonic levels of the line current are well known to be quite high. So far, a time simulation method has been used to analyze the harmonic current. This method is very accurate, but it requires a long computing time and a complicated algorithm.This paper proposes a practical new method to easily calculate the harmonic currents for both the continuous and discontinuous current conductions. The proposed method is based on the frequency domain method and the rectifier switching functions. Analytical equations for the harmonic currents on both the DC and AC sides are derived, taking into account the effects of filter capacitance and line reactance. All the calculations are conducted only by algebraic calculation with high accuracy. The effectiveness of the proposed method is confirmed by comparison with the results obtained by the simulation method.
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