Enhanced Coordinated Control of ITER Power Supplies and Reactive Power Compensation System

The operational stability of ITER power supplies requires the optimal coordination of the reactive power compensation (RPC) system, which comprises a thyristor-controlled reactor (TCR) and tuned filters, particularly under high-dynamic load conditions. Existing RPC control methods have inherent limitations, such as high latency, model dependency, and poor disturbance rejection, which restrict their ability to meet stringent regulation demands during extreme plasma control scenarios. This article develops a forecasting-<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$Q$</tex-math> </inline-formula>-linear active disturbance rejection control (FQLADRC) framework that integrates an extended state observer (ESO) and a proportional-derivative (PD) controller, with predictive <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$Q$</tex-math> </inline-formula> commands calculated by coordinating plasma control system (PCS) reference signals. The proposed control strategy achieves higher precision in dynamic <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$Q$</tex-math> </inline-formula> regulation, faster transient responses, and strong robustness against model deviations and environmental interference. Key <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$Q$</tex-math> </inline-formula>-linear active disturbance rejection control (QLADRC) parameters are determined via bandwidth parameterization with engineering configurations. Simulations validate the algorithm’s efficacy, showing significant reductions in grid <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$Q$</tex-math> </inline-formula> oscillations and voltage fluctuations during load disturbances, alongside improved ac busbar stability. Furthermore, this work provides guidance for optimizing RPC systems in other high-capacity, strong-impulse power grids, with resilience to internal uncertainties (e.g., response delays and parameter perturbations) and external disturbances (e.g., harmonics and operational noise).