Zero-voltage vector optimal modulation device and method for five-arm two-permanent-magnet motor system

Abstract

The invention belongs to the technical field of permanent magnet motor control, and aims at effectively improving the rotating speed range of a motor and reducing the harmonic waves of a three-currentcurrent on the basis that a hardware circuit of a five-bridge-arm two-permanent-magnet-motor system is not changed. The invention discloses a zero voltage vector optimization modulation device and method for the five-bridge-arm two-permanent-magnet-motor system, and the system consists of a five-bridge-arm inverter, two permanent magnet synchronous motors and a microprocessor. The input of a three-phase power grid and an uncontrollable rectifier bridge serves as the input of the five-bridge-arm inverter, and each bridge arm of the five-bridge-arm inverter is formed by the series connection oftwo switching tubes, wherein the series connection points output one phase for the control of the two permanent magnet synchronous motors. The microprocessor is provided with a speed ring and currentring PI (proportional-integral) controller, carries out the space voltage vector pulse width modulation, and controls the generation of on / off signals of the switching tubes to drive the motors to operate. The device and method are mainly used for the control of the permanent magnet synchronous motors.

Description

technical field [0001] The invention relates to a two-motor voltage vector optimization modulation strategy, which belongs to the field of multi-motor control. In particular, it relates to a zero-voltage vector optimization modulation strategy applied to a five-bridge-arm two-permanent-magnet motor system. Background technique [0002] In recent years, with the development of modern industrial technology, in some industries such as electric vehicles and heavy-duty lifting, it is often necessary to drive two motors at the same time to improve the traditional single-motor drive with low reliability, poor control performance, and complex mechanical transmission mechanism of the system. , Higher power requirements for a single motor, etc. In the control of two permanent magnet motors, the five-leg inverter drive system is a better fault-tolerant scheme, which has been widely studied, that is, the five-leg inverter is used to independently control two three-phase motors. This m...

AI Technical Summary

Problems solved by technology

Due to the long time of zero-vector action in the traditional modulation strategy, the utilization rate of the DC bus voltage by the two motors is low, and the speed regulation range is limited.

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