Comprehensive Physical Commutation Characteristic Analysis and Test of Hybrid Line Commutated Converter Based on Physics Compact Model of IGCT

In order to mitigate commutation failure of high voltage direct current (HVdc) system, a novel hybrid line commutated converter (H-LCC) based on integrated gate commutated thyristor (IGCT) and thyristor has been proposed. To verify the proposed scheme's effectiveness and correctness, the physics-based compact model of reverse blocking IGCT (RB-IGCT) and physics-based model of thyristor are established in this article. By comparing the features of physics-based model with other simulation methods, it can be observed that the former has obvious advantages. On the basis, a simulation study of proposed H-LCC based on physics compact model of RB-IGCT and physics-based model of thyristor is conducted to analyze the physical commutation characteristics comprehensively, which is verified by equivalent commutation tests. The H-LCC can mitigate commutation failure of HVdc effectively and physics-based model of H-LCC is expected to be applied in the simulation of dc grid equipment and provide reference for commutation characteristics analysis and snubber parameter optimization that need rapid and multiple simulations.