Modeling and Application of wide-frequency Model for Harmonic analysis of HVDC System

The wide-frequency model of HVDC system is an important tool to study the harmonic and interference characteristics in wider frequency band. The actual structure of HVDC key equipment are studied, and the influence of its stray parameters on the wide-frequency model is analyzed, taking into account inter-turn stray capacitor and skin effect at high frequencies of converter transformer and smoothing reactor, wide-frequency model of key equipment is established, and compare it with the measured resistance-frequency characteristic curve to prove the accuracy of wide-frequency model. Based on the wide-frequency model of key equipment, wide-frequency model of HVDC system is established, and the harmonic characteristics are compared with common model and the measured waveforms. The results show that the wide-frequency model can reflect the harmonic characteristics more accurately, and the accuracy and validity of the model are also verified.