Simplified model predictive direct torque control method based on finite state sets

Abstract

The invention discloses a simplified model predictive direct torque control method based on finite state sets, which includes the following steps: calculating a cost function g and substituting seven basic voltage vector sets into the cost function g; adding a sector position signal and a torque angle signal for judgment, and calculating the value of the cost function g according to the stator flux amplitude value and the torque value at the next moment to obtain a voltage vector minimizing the cost function; adding a signal of the current torque angle, and abandoning the voltage vectors with low selection rate by taking the ranges of different sector position signal and different torque angles as the limit conditions; and according to the mean value of the cost function, the mean square root error of torque, the mean square root error of stator flux, the mean value of an evaluation function and the average switching frequency, adopting a simplified alternative voltage vector set control strategy to reduce the calculation burden of model predictive control and realize direct torque control. Under the premise of maintaining good control performance, the burden of prediction calculation is reduced, and the real-time performance of the system is improved.

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 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 function. But along wit...

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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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