Control strategy for three-phase four-wire PWM converter of integrated voltage compensation type active SFCL

摘要

The integrated voltage compensation type active superconducting fault current limiter (SFCL) is composed of three air-core superconducting transformers and a three-phase four-wire PWM converter In order to realize the current-limiting characteristics of the integrated active SFCL, it is needed to control the three-phase four-wire PWM converter flexibly and reasonably Thereby, the control strategy for the converter is analyzed in this paper In dq0 reference frame, the mathematical model of the converter is founded The double-loop control strategy, consisting of voltage outer loop and current inner loop, is presented. Moreover, the voltage balance control for the split DC link capacitors is also considered Using MATLAB. the simulation model of the integrated active SFCL is built According to the simulation results, iris known that, the presented control strategy is feasible and valid, and the converter can work well under unsymmetrical and symmetrical fault conditions, and then the fault current can be limited quickly and effectively Crown Copyright .