PMSM double-vector predictive current control method based on LADRC

Abstract

The invention belongs to a permanent magnet synchronous motor control method, and discloses an LADRC-based PMSM double-vector predictive current control method, which comprises the following steps of: 1, obtaining a controlled state equation of a PMSM speed ring through a mechanical equation of a permanent magnet synchronous motor, and designing a first-order linear active-disturbance-rejection controller of a rotating speed outer ring on the basis of the controlled state equation; 2, a current inner loop adopts model predictive current control (MPCC), a current discrete mathematical model is established to predict a current vector at the next moment, vector action time is calculated in a q-axis deadbeat mode, meanwhile, a double-vector combination of a first voltage vector V1 and a second voltage vector V2 and a resultant vector combination at the corresponding action time are calculated, and the current vector at the next moment is calculated; and double-vector current prediction is completed. The method is simple in structure, small in calculation amount and easy to implement, and is applied to a PMSM control system, the dynamic response speed of the motor is high, stator current ripples and distortion are small, the switching frequency is low, and the dynamic and steady-state performance of the system is excellent.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motor control, specifically a PMSM double-vector predictive current control method based on LADRC Background technique [0002] The permanent magnet synchronous motor (Permanet-Magnet Synchronous Motor, PMSM) has the advantages of small size, high efficiency, and strong overload capacity. attention and research. [0003] At present, PMSM has a variety of control techniques, such as vector control, direct torque control, sliding mode control and fuzzy control. However, the above-mentioned control methods have certain deficiencies. For example, vector control has good steady-state operation ability, but its dynamic performance is easily affected by the current inner loop. Torque control has good robustness and dynamic response speed. But usually have larger torque ripple. Model predictive control (Moedl Predictive Control, MPC) was born in the 1960s. With the rapid developmen...

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Problems solved by technology

[0005] Aiming at the improvement needs of the above-mentioned prior art, the present invention provides a PMSM double-vector predictive current control method based on LADRC. For the outer ring of the speed, LADRC is used to replace the traditional PI controller, which solves the problem of overshoot and rapidity. Considering the problem of both, the robustness of the system is improved; for the current inner loop, the dual-vector model predictive control technology is adopted, and the stator current is used as the target based on the model predictive current control (MPCC), and the possible two-vector combination and corresponding The combination of synthetic vectors under action time expands the selection range of voltage vectors to voltage vectors of any direction and any amplitude, making the selection of voltage vectors more accurate

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