Disturbance-rejection model predictive current control for dual-three-phase permanent magnet synchronous generators with harmonic subspace consideration

To address harmonic current proliferation and parameter sensitivity in conventional vector model predictive control (V-MPC) for dual-three-phase permanent magnet synchronous generators (DTP-PMSGs), this paper proposes a harmonic subspace-incorporated disturbance-rejection MPC strategy. First, an enhanced virtual voltage vector synthesis technique is developed in which three optimal voltage vectors per control sector were strategically combined to achieve full-amplitude and omnidirectional voltage coverage, eliminating harmonic subspace excitation. Second, a super-twisting integral disturbance observer is designed to dynamically estimate and compensate for parameter mismatches and nonlinear rectification disturbances, thereby enhancing the robustness against model inaccuracies. Third, a composite harmonic suppression controller is proposed to replace traditional PI regulators, enabling zero-steady-state error tracking of fundamental currents while actively attenuating harmonic subspace components. Experimental validation confirmed that the proposed methodology improves the fundamental current-tracking accuracy, significantly suppresses harmonic currents, and maintains a robust dynamic response under parameter variations.