Voltage cutting method based weak magnet method for low-switch-loss open-winding permanent synchronizing motor system

Abstract

The invention discloses a voltage cutting method based weak magnet control method for a low-switch-loss open-winding permanent synchronizing motor system. The method is that the voltage cutting method and the optimal zero vector selecting method are combined to use; a main inverter is controlled by the manner of combining single effective voltage vector and zero vector to output voltage vector under the limited power condition; the switch loss can be reduced while the active power is outputted as system requirement; the capacitive voltage stability is maintained; compared with the SVPWM switch loss, 1 / 3 of the loss is reduced, and thus the system efficiency can be greatly to the maximum; the inverter is controlled and adjusted to provide reactive powder and can compensate the harmonic wave caused by low switching frequency of the main inverter; therefore, high-efficiency and high-performance control of an open-winding motor can be achieved; meanwhile, the method is applied to the weak magnet control based on the effective voltage vector action time feedback, and the operation range of the motor can be expanded.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a field-weakening control method for an open-winding permanent magnet synchronous motor system based on a voltage cutting method. Background technique [0002] With the aggravation of global environmental pollution and energy crisis, electric motors are gradually replacing the position of traditional fuel machinery such as internal combustion engines in transportation traction, becoming a new type of drive system with high efficiency and high performance, promoting the use of electric vehicles, ship electric propulsion, and high-speed railways. Represented by the vigorous development of electric traction technology. [0003] Permanent magnet synchronous motors have been widely used due to their high power density, high power factor and high operating efficiency, which is largely due to the fact that the permanent magnets of the rotor do not require electrical ex...

AI Technical Summary

Problems solved by technology

However, the field weakening control of open-winding permanent magnet synchronous motors based on this structure currently adopts the conventional voltage feedback method, and the voltage utilization rate is not high

For example, in Document 4 (“Extension of the Operating Region of an IPM Motor Utilizing Series Compensation”, Di Pan et.al, IEEE Transactions on Industry Applications, 2014, 50(1):539-548), the given voltage of the main inverter is taken as amount of feedback, As a given amount, the field-weakening control of the open-winding motor is performed, and the utilization ratio of the DC bus voltage is only 0.905

Images