A Low-Frequency Coordinated Control Method for Tokamak Hybrid Active Power Filter

Tokamak power supply system generates non-stationary harmonics which tend to exhibit high power, complex spectrum and drastic change. Although the hybrid active power filter (HAPF) can effectively exclude those non-characteristic harmonics, especially in the low-frequency spectrum, it is intricate to consider low-frequency harmonic extraction, correction, overall filtering performance and stability of the system at the same time. To ensure that HAPF can adapt to complex Tokamak power supply, the mathematical function of the whole power supply system is established in this paper, and the coordinated control method containing low-frequency harmonic detection, stability correction and filtering effect analysis is proposed. The effectiveness of the control method in the whole system is simulated by PSCAD/EMTDC, and the detection method has been debugged on the DSP.