Research on Three-Phase Electronic Load Based on Three-Vector Model Predictive Current Control by Expected Sector

Aiming at the problems such as low simulation accuracy, slow dynamic response and poor anti-interference ability of traditional control methods for linear or nonlinear loads, a three-vector model predictive current control method based on fast prediction sector judgment is proposed. Firstly, the mathematical model of α-β coordinate system is established, and the relationship between the expected voltage vector and the basic voltage vector is analyzed. Then using the sector decision condition proposed in this paper, the sector in which the desired voltage vector is located can be quickly determined. This method greatly reduces the amount of computation required to perform 6 times cost function evaluation in traditional three-vector control method. Finally, two-step prediction is introduced to compensate for sampling and calculation delay. The simulation and experimental results show that the proposed control method can shorten the adjustment time by 0.1s compared with the traditional PI control, effectively improve the simulation accuracy of nonlinear load, and reduce the calculation amount by about 70% compared with the traditional three-vector method.