关键词: 开绕组永磁同步电机, 四桥臂, 预测电流控制

Abstract: Compared with the conventional dual inverter control system, the four-bridge control system of open winding permanent magnet synchronous motor can significantly reduce the cost under the condition of ensuring the same DC bus voltage utilization. In order to suppress the zero-sequence current of the four-bridge control system of the common-bus open-winding permanent magnet synchronous motor, a novel zero-sequence current suppression method based on 3 D space fast selection of optimal voltage vector and non-beat predictive current control was proposed on the basis of traditional model predictive current control. The mathematical model of the common DC bus four-arm system and the voltage vector distribution in the αβ plane were analyzed. The model prediction current algorithm was used for control. The spatial voltage vector distribution system in abc coordinate system was established, and the geometric space relationship was analyzed, and the method of selecting the optimal voltage vector was proposed. The efficiency was greatly improved, and the zero sequence current was effectively suppressed. A zero-sequence current suppression strategy based on no-beat predictive current control was proposed by using the medium vector modulation method, which not only suppressed the zero-sequence current , but also did not require complicated value function calculation and greatly reduced the calculation amount . The control method could significantly improve the dynamic and steady state performance of the system. Simulation results showed that the control method was correct and effective.

Key words: open-winding permanent magnet synchronous motor ( OW-PMSM), four leg converter, predictive current control( PCC)