Optimized Adaptive Three-Phase Active Inductance Considering Multiple Factors

Based on the topology of active inductance, an optimized adaptive three-phase active inductance control strategy considering multiple factors is proposed, and the proposed optimized adaptive active inductance is applied to the grid-side filtering of the variable frequency speed motor drive system to replace the passive inductor. Compared with the adaptive control based on grid-side current THD, this paper adds a DC bus current ripple adaptive control loop and a working condition judgment loop on this basis, which can not only further reduce the 100Hz and 200Hz harmonics generated under unbalanced working conditions, but also reduce the third harmonic on the grid-side, thereby further improving power quality. Through the dynamic characteristics simulation and comparison experiments of multiple control strategies, it can be seen that the optimized adaptive three-phase active inductor reduces the grid-side current THD and DC bus current ripple under different working conditions.4