Direct prediction torque control method and system for permanent magnet synchronous motor

Abstract

The invention discloses a direct prediction torque control method and system for a permanent magnet synchronous motor. A prediction model is used for directly performing prediction calculation on torque and stator flux linkage based on eight groups of actual space voltage vectors; an actual space voltage vector screening evaluation function is constructed based on the absolute value constructed by the switching times of the inverter, the stator flux linkage amplitude and the torque estimation offset during actual space voltage vector conversion; the high-concurrency register conversion level digital circuit design and Verilog coding comprise all functional circuit integration modules. The invention discloses an RTL code digital test platform based on a Verilog language. The functionality and comprehensiveness of RTL codes are detected. According to the control system based on the method and the FPGA, the control frequency of the permanent magnet synchronous motor is effectively improved, small torque pulsation is guaranteed, the switching frequency is reduced, and the service life of a power device is prolonged.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motor control, and in particular relates to a method and system for directly predicting torque control of a permanent magnet synchronous motor. Background technique [0002] At present, the most common control methods for permanent magnet synchronous motors are current vector control strategy and direct torque control strategy. The traditional current vector control strategy uses cascaded structure, through PI controller and space vector pulse width The control of the controlled object, such as control, has a relatively simple control strategy structure, which is widely used in various industrial fields and occupies a dominant position, but it also has the disadvantages of relying on the value of the controller parameters and poor dynamic response. [0003] The direct torque control method provides a new idea for permanent magnet synchronous motor control because of its simple...

AI Technical Summary

Problems solved by technology

[0002] At present, the most common control methods for permanent magnet synchronous motors are current vector control strategy and direct torque control strategy. The traditional current vector control strategy uses cascaded structure, through PI controller and space vector pulse width The control of the controlled object has a relatively simple control strategy structure, which is widely used in various industrial fields and dominates, but it also has the disadvantages of relying on the value of the controller parameters and poor dynamic response.

[0003] The direct torque control method provides a new idea for permanent magnet synchronous motor control because of its simple structure, fast torque dynamic response, and no modulation. However, traditional DTC relies on switch lookup tables, which occupy too many register resources, and Lack of quantitative control and compensation strategies, relatively speaking, the torque fluctuation is relatively large

Images