Double-vector-based winding open-circuit permanent magnet synchronous motor current prediction control method and device

Abstract

The invention discloses a double-vector-based winding open-circuit permanent magnet synchronous motor current prediction control method and device. According to the method, the reference voltage vector of a motor is calculated on the basis of a current dead beat principle; the voltage vectors of a first inverter are determined according to the position of the reference voltage vector; the reference voltage vector of a second inverter can be calculated on the basis of a relationship between the motor voltage vector and the inverter voltage vector; two non-zero vectors are determined according to the position of the reference voltage vector of the second inverter within the vector hexagon of the second inverter, so that the range and number of the candidate voltage vectors of the second inverter are obtained; the voltage vectors of the second inverter are combined in pairs, so that an optimal vector combination is determined through calculation; and the voltage vectors of the first inverter and the voltage vectors of the second inverter are outputted in a combined manner. Thus, zero-sequence current during winding open-circuit permanent magnet synchronous motor current prediction canbe effectively suppressed, current ripples are reduced, steady state performance is improved, and test costs are reduced.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a current predictive control method and equipment for a permanent magnet synchronous motor based on double vector winding open circuits. Background technique [0002] Bilateral controllable open-winding permanent magnet synchronous generator system (OW-PMSG) has received more and more attention because of its good fault tolerance, flexible control mode and multi-level modulation effect. However, the common DC bus topology provides a zero-sequence current path, so that zero-sequence current exists in the system. Zero-sequence current will increase system loss and increase torque ripple, reducing the efficiency of the entire system. Therefore, in order to eliminate the zero-sequence current as much as possible, it is necessary to directly suppress the zero-sequence current. [0003] Usually the current prediction is to predict the current at the next moment through the current curren...

AI Technical Summary

Problems solved by technology

Moreover, in the traditional vector control method, the adjustment of inverter parameters is many and complex, and the zero-sequence current in the double-sided controllable open-winding permanent magnet synchronous generator system of the common DC bus is difficult to control, and the current ripple is high.

Images