Dual-Three-Voltage-Vector Model Predictive Power Control Method for a Doubly-Fed Induction Machine in Shipboard Propulsion

A novel dual-three-voltage-vector model predictive power control (DTVV-MPPC) strategy is proposed for a doubly-fed induction machine (DFIM) in shipboard propulsion in this paper. Since the DFIM inherently possesses multiple power flow paths, it offers advantages under faulty conditions. The proposed DTVV-MPPC strategy can fully eliminate the power errors by accurately selecting three basic voltage vectors (VVs) with optimal action time in one control period for either the source-side converter (SSC) or load-side converter (LSC). The power-voltage relationship is clearly illustrated through the negative conjugate of complex power at the SSC and stator sides. In addition, the zero and nonzero VV portions are split in the proposed method to calculate the action time for each VV, which clarifies the spatial relationship of VVs and simplifies the calculation process. The proposed DTVV-MPPC strategy is able to greatly decrease power ripples and current harmonics. Moreover, excellent steady-state and dynamic performance of DFIM in shipboard propulsion can be obtained. Simulation verification of the proposed DTVV-MPPC strategy in Matlab/Simulink is carried out for a 1.5 kW DFIM to demonstrate its effectiveness and potential in all-electric ship applications.