Model prediction current control method for dual-motor torque synchronization system

Abstract

The invention discloses a model prediction current control method for a dual-motor torque synchronization system, and belongs to the field of power electronics and motor control. According to the method, an indirect matrix converter dual-motor system adopting coaxial rigid connection is taken as an object, and dual-motor torque synchronization performance and current tracking performance are takenas main control targets; and in order to solve the problems that the setting process is tedious and complex and wrong switch combination states are easy to select due to the fact that a value function weight coefficient depends on artificial experience setting, a dual-motor unified prediction model is established, and a value function based on error term free components is constructed. A self-adaptive weight coefficient setting strategy capable of automatically matching the working state of the system is provided, so that the workload and the complexity of system design are effectively reduced. According to the method, the torque synchronization error of the double motors can be effectively suppressed, and the good torque synchronization performance and current tracking performance of thesystem are ensured. In addition, the invention can also be expanded from a dual-motor system to a multi-motor system.

Description

technical field [0001] The invention relates to a model predictive current control method of a dual-motor torque synchronous system driven by an indirect matrix converter, belonging to the field of power electronics and motor control. Background technique [0002] In shield excavation, steel manufacturing, tunnel construction and other industrial applications, a single motor is usually difficult to meet the requirements of heavy load and high torque, and multiple motors need to be used for synchronous drive. The coaxial rigid connection of two motors is One of the most widely used in multiple motor control. The DC bus of the indirect matrix converter can be connected in parallel with multiple inverter stages to form a multi-motor synchronous drive system. There is no intermediate DC energy storage link, and bidirectional energy flow can be realized. It has the advantages of compact structure and high integration. , metal rolling, aerospace and other industrial applications ...

AI Technical Summary

Problems solved by technology

However, the traditional MPCC using the weighted summation value function and weight coefficient empirical setting method has the following problems: (1) There are dimension differences in each error item in the weighted summation type value function, and the values ​​of each error item are different. When When the value of the weight coefficient is unreasonable, it may cause the system to choose the wrong switch combination state; (2) The empirical setting process of the weight coefficient is cumbersome and complicated. Can rely on personal experience to choose; (3) When the initial value of the synchronization error weight coefficient covers a wide range and the order of magnitude is large, the number of adjustments will increase accordingly, and finally only the approximate range of the synchronization error weight coefficient can be obtained, and its optimal value cannot be determined. value

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