Overmodulation control method and device, motor driving system and storage medium

Abstract

The invention discloses an overmodulation control method and device, a motor driving system and a storage medium. The method comprises the following steps: acquiring a motor direct current bus voltage and an expected voltage vector; judging whether the three-phase inverter enters an overmodulation area or not according to the direct current bus voltage and the amplitude of the expected voltage vector; if the three-phase inverter enters the overmodulation area, obtaining a plurality of segmented voltage vectors according to the expected voltage vector and a voltage amplitude limiting hexagon determined by the DC bus voltage; setting a rotation speed regulation rule for the plurality of segmented voltage vectors; correcting the expected voltage vector according to an adjusting rule to obtain a corrected voltage vector; and performing overmodulation control on the three-phase inverter according to the corrected voltage vector. According to the overmodulation control method, the direct-current voltage can be utilized to the maximum extent, meanwhile, the voltage linearity and harmonic content factors of the over-modulation area can be fully considered, and the control performance is ensured.

Description

technical field [0001] The invention relates to the technical field of motor vector control, in particular to an overmodulation control method and device, a motor drive system, and a storage medium. Background technique [0002] Vector Control (Vector Control), also known as Field-Oriented Control (FOC for short), is a technology that uses an inverter to control a three-phase AC motor. The output of the motor is controlled by adjusting the frequency, magnitude and angle of the inverter output voltage through PWM (Pulse Width Modulation, pulse width modulation) technology. [0003] Commonly used pulse width modulation techniques include SPWM (Sine Pulse Width Modulation, sinusoidal pulse width modulation) and SVPWM (Space Vector Pulse Width Modulation, space vector pulse width modulation), which both use high-frequency triangular carrier waves to intersect with reference voltage modulation waves, A high-frequency pulse signal is generated to drive the switch tube of the inve...

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Problems solved by technology

[0005] It can be seen that when the voltage vector to be synthesized exceeds 1 / sqrt(3) of the DC bus voltage, it cannot be synthesized according to the above rules in some positions

Therefore, the voltage vector needs to be corrected, and the simple overmodulation control method based on the principle of time redistribution can only increase the DC voltage utilization rate to a maximum of 0.952

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