This paper proposes a novel sequence-based finite-time composite control scheme for the voltage-source inverter, which can flexibly deal with the load variations and asymmetries. This control scheme is based on sequence separation, that is, all sampled signals are decomposed into positive- and negative-sequence components. Then, the models of the positive and negative-sequence subsystems are established, allowing different handling methods of the disturbances present in the system: the step disturbances caused by load variations are estimated by FTDOs and compensated, while the harmonic disturbances caused by asymmetric loads are suppressed by using negative-sequence feedback control. Both the positive and negative-sequence controllers are designed based on the homogeneity theory. By combining the finite-time disturbance observers and controllers, a finite-time composite control scheme is obtained. This makes the dynamic performance and disturbance rejection capability of the system enhanced. The global finite-time stability of the closed-loop system under the proposed composite control scheme is rigorously proved. Furthermore, the effectiveness of the proposed control scheme is verified through simulations and experiments.
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