关键词: 级联无差拍控制, Luenberger 观测器, 扇区简化技术, 三电平整流器, 有限控制集模型预测控制

Abstract: To address the issues of high computational intensity and prolonged computation time in the operation of finite control set model predictive control ( FCS-MPC) , the proposes a cascaded deadbeat control strategy for three-level rectifiers based on simplified space vector modulation, which selects the optimal voltage vector by constructing specific sectors. to establish an accurate system model, the thoroughly analyzes the three-level rectifier and constructs a twodimensional discrete system mathematical model. Based on the deadbeat control concept, a dual-loop control scheme comprising a power inner loop and a voltage outer loop was designed. The Luenberger observers were established to precisely estimate and compensate for power disturbances and load changes, enabling rapid decoupling and response of reactive and active power. in conjunction with the aforementioned system architecture, normal, single-prediction, and simplified prediction FCS-MPC models were established and their equivalences are proven. The impact of different constraint variables on voltage vector decision was analyzed, and a simplified space vector modulation strategy was designed by constructing specific selection sectors. Experimental results demonstrate that the proposed control strategy can improve performance under multiple constraints and significantly reduce the computational load while maintaining the control effect.

Key words: cascaded deadbeat control, Luenberger observer, sector simplification technique, three-level rectifier,finite control set model predictive control( FCS-MPC)