MPC based on balanced positive-sequence extraction strategy for grid-tied converter control

The massive penetration of renewable energy sources in grid-tied systems has boosted the improvement of conventional control solutions to fulfill the requirements demanded during grid faults. In this paper, balanced positive-sequence reference extraction method (BPSC) is proposed with the predictive technique to control the 3L-NPC inverter under grid sags. Only positive sequence extraction is needed to inject properly the generated reference currents through MPC controller. Moreover, no additional phase-locked loop synchronization technique is required. A Second Order Generalized Integrator filter is added for voltage sequences extraction. The overall discrete system model is developed. Simulation results show the advantages of the proposed algorithm in terms of injecting a set of balanced grid current with low harmonic content during grid sags.

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