ADRC-Based Pole Control Strategy of Hybrid Line Commutated Converter for HVDC

This paper proposes a novel dual-loop Active Disturbance Rejection Control (ADRC) framework tailored for Hybrid Line Commutated Converter (HCC) HVDC systems. Unlike conventional Line-Commutated Converter (LCC) systems, which depend on passive commutation and fixed extinction angle control-resulting in limited flexibility and susceptibility to grid perturbations-HCC systems with IGCT enable independent and precise regulation of the extinction angle, which diminishes the necessity of adhering to a fixed extinction angle, exposing the limitations of traditional control strategies in fully exploiting HCC capabilities. To address this, the proposed dual-loop ADRC controller integrates DC voltage regulation with extinction angle management within a unified framework, achieving dynamic optimization of both parameters. This approach enhances disturbance rejection and system stability, offering superior performance over conventional methods. Validated through Matlab simulation, this study represents a significant step forward in advancing control methodologies.