A Harmonic Compensation Method for Three-level Active Power Filter Based on Predictive Control

The model predictive controller is used to predict the reference current of the next control cycle. The three-level topology has the advantages of large output capacity, high output voltage and low harmonic content. The three-level structure has been widely applied in the field of the regulation of high voltage and high-power AC motor. In this paper, the equivalent structure of APF system for predictive current control is established, and the stability analysis is decomposed into two parts: current prediction algorithm stability and SVPWM stability. Fuzzy complex control is complemented on the DC bus voltage. The proposed method effectively reduces the harmonic content and improves the compensation accuracy. The simulation results verify the effectiveness of the proposed method.