Wide-band Harmonic Coupling Characteristic Analysis of Thyristor Rectifier

The wide frequency range of harmonic components introduced by the extensive access of power electronic equipment to the power grid will induce the phenomenon of under-damped high-frequency oscillation and harmonic amplification in the increasingly power electronic power grid system, which threatens the safety and reliability operation of the system. With the continuous improvement of the response frequency band of the power electronic grid system, it is necessary to conduct a more comprehensive research and description of the broadband port characteristics of the thyristor rectifier, to provide technical support for the broadband interactive response analysis of power electronic devices. So this paper analyzes the relationship between the port voltage and current of the thyristor rectifier, and establishes a small-signal model based on the harmonic transfer function matrix (HTF). The model can accurately describe the frequency coupling characteristics in a wider frequency range. On this basis, an on-demand truncated HTF description method suitable for usage scenarios is proposed. At last, the accuracy of the proposed HTF modeling results is verified by simulation and experiments.