Three-Vector-Based Model Predictive Direct Power Control Strategy for PWM Rectifier

TLDR: The proposed MPDPC is based on an optimal application of three voltage vectors in a symmetrical way, known as symmetrical 3+3 vectors' sequence, which achieves the steady-state harmonic spectrum at lower level and remains quick dynamic responses.

Abstract: A novel strategy of model predictive direct power control (MPDPC) for PWM rectifier is proposed in this paper. Previous studies have proposed one-vector-based and two-vector-based MPDPC methods for PWM rectifier, which achieve good steady-state performance and quick dynamic responses. However, due to the limited switching states in the three-phase two-level PWM Rectifier, the sampling frequency should be high to obtain the satisfactory control performance. Besides, the switching frequency is variable, and this makes it difficult to design the filtering inductance. To deal with those problems, while maintaining all the advantages of the conventional MPDPC, this paper presents a new control strategy. The proposed MPDPC is based on an optimal application of three voltage vectors in a symmetrical way, which is known as symmetrical 3+3 vectors' sequence. The simulation and experimental results prove that, compared to conventional MPDPC, the proposed MPDPC achieves the steady-state harmonic spectrum at lower level and remains quick dynamic responses.