Simplified alternative finite state set model predictive direct torque control method

Abstract

The invention discloses a simplified alternative finite state set model predictive direct torque control method. The method is characterized in that a cost function g value is calculated and substituted into a seven-basic voltage vector set, a hysteresis control signal, a sector position signal and a torque angle signal are added for determined, a cost function g value is calculated by a stator flux amplitude and a torque value at the next moment, and a voltage vector with the smallest cost function is derived; a signal of the current torque angle is added, the range of different hysteresis control signals, sector position signals and different torque angles is utilized as the limiting condition, and low-utility voltage vectors are discarded; through a torque ripple root mean square error,a flux linkage rms error, an evaluation function mean and an average switching frequency index, the simplified alternative voltage vector set control strategy is utilized to reduce computational burden of model predictive control, and direct torque control is achieved. The method is advantaged in that under the premise of maintaining good control performance, the prediction calculation burden isfurther reduced, and real-time performance of the system is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a direct torque control method for simplification and alternative finite state set model prediction. Background technique [0002] The direct torque control technology is based on the stator flux coordinate system and directly takes the torque as the control object, avoiding a large number of calculations during the transformation of the rotating coordinates and the dependence on the motor parameters. It has good dynamic performance and short torque response time. [0003] In the surface permanent magnet synchronous motor direct torque prediction control system, there are six basic voltage vectors and two zero voltage vectors, the evaluation function is introduced, and the torque error and the stator flux linkage error are considered comprehensively. The angular position of the chain in the rest coordinates, output the voltage vector with the minimum evaluation ...

AI Technical Summary

Problems solved by technology

[0004] However, with the variable and operation function, the time and complexity of predictive calculation operation are increased. Therefore, a simplified alternative finite state set model prediction direct torque control method based on voltage vector utilization is proposed to optimize the performance of the control system.

Images