Analytical Model of 12-Pulse AC-DC Converter Based on Switch Function

This paper proposes a frequency domain method to analyze the harmonics components of input current and ripple coefficients of output voltage in 12-pulse diode rectifier system. Based on frequency domain linearity and analysis of commutation, the dc side output voltage and input line current are divided into two segments, and then expressions of the input current and output voltage are obtained. Some simulation results about THD, power factor and ripple coefficient are shown to validate the correctness of the proposed method

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