A Simplified Finite State Set Model Predictive Direct Torque Control Method

Abstract

The invention discloses a simplified finite state set model prediction direct torque control method, calculates the cost function g and brings it into seven basic voltage vector sets, judges by adding sector position signals and torque angle signals, and passes through the next moment again The value of the cost function g is calculated by the stator flux linkage amplitude and torque value, and the voltage vector with the minimum cost function is obtained; the signal of the current torque angle is added, and the range of different sector position signals and different torque angles is used as a constraint condition. Abandon the voltage vector with low selection rate; according to the mean value of the cost function, the root mean square error of the torque, the root mean square error of the stator flux linkage, the mean value of the evaluation function and the average switching frequency, a simplified alternative voltage vector set control strategy is used to reduce the model prediction The calculation burden of the control is achieved by direct torque control. On the premise of maintaining good control performance, the present invention reduces the burden of prediction calculation and effectively improves the real-time performance of the system.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a simplified finite state set model prediction direct torque control method. Background technique [0002] The direct torque control technology is based on the stator flux linkage coordinate system and directly uses the torque as the control object, which avoids a large number of calculations during the transformation of the rotation coordinate and the dependence on the motor parameters. It has good dynamic performance and short torque response time. [0003] In the surface-type permanent magnet synchronous motor direct torque predictive control system, there are six basic voltage vectors and two zero-voltage vectors, an evaluation function is introduced, and two aspects of torque error and stator flux linkage error are comprehensively considered. The chain is at the angular position of the stationary coordinate and outputs the voltage vector with the smallest m...

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Problems solved by technology

However, with variables and operation functions, the time and complexity of predictive calculation operation are increased

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