Research and Application of Chain Type APF Using PIλ Current Inner-Loop Controller in the Outer Superconducting Magnet

Steady-state magnetic field Superconducting magnets power supply with double inverse star thyristor rectifier technology solutions, is a typical non-linear loads, will bring great reactive power impact and harmonic pollution at runtime. This paper according to the scheme of scientific facility chain type high voltage active power filter (APF), combined with the non-linear characteristics of the active filter system and proposed a current inner-loop decoupling method using fractional order PI controller instead of ordinary PI controller. Based on the improved Oustaloup algorithm, the solution of fractional order calculus is realized. Finally, the working effect of fractional order PI controller and ordinary PI controller are comparative analysis through simulation and experimental results, the results show that: fractional order current inner-loop PI controller used in this paper is correct, and has a certain reference value.