Active Disturbance Rejection Control With a Cascaded Extended State Observer for Pumping Kite Generator Systems Robust DC-Link Voltage Control

Pumping Kite Generator Systems (PKGS) offer a pioneering solution for wind power generation by harnessing stronger and steadier high-altitude winds using kites. DC-link voltage regulation is crucial in such systems to ensure efficient energy generation and reliable grid integration. However, the unique operating characteristics of PKGS, including periodic disturbances during generation phases and sudden disturbances in transition phases, pose significant challenges to traditional control strategies. This paper proposes an enhanced active disturbance rejection control (ADRC) methodology tailored explicitly for PKGS applications. By integrating a cascaded extended state observer (CESO) with known disturbance compensation, the developed control approach mitigates the limitations of conventional ADRC and integral-proportional (IP) controllers in handling multifaceted disturbances. Simulation and hardware-in-the-loop studies validate the proposed ADRC strategy, demonstrating superior DC-link voltage regulation accuracy, response time, and robustness compared to IP control and classical ADRC formulations.