Motor synchronous control method, apparatus thereof and system thereof

Abstract

The invention discloses a motor synchronous control method, an apparatus thereof and a system thereof. The method comprises the following steps: when determining a present modulation mode is synchronous modulation according to an obtained present modulation ratio and stator frequency, determining present frequency division amount; determining preset switching angle and a stator flux threshold corresponding to the modulation ratio and the present frequency division amount; comparing an obtained feedback linkage threshold with the stator linkage threshold, and outputting a control signal according to a comparison result. According to the motor control method disclosed in an embodiment of the invention, through a switching angle calculated in advance corresponding to a modulation ratio, the stator linkage threshold corresponding to the switching angle is determined, an actual feedback linkage threshold and the stator linkage threshold are compared, according to the comparison result a control signal is outputted, over-modulation and a further step of processing over-modulation area caused by adding the modulation ratio are avoided. Control flow of a system is simplified, working efficiency is raised, and an orbit of the motor stator becomes a regular polygon.

Description

technical field [0001] The invention relates to the field of electrical control, in particular to a motor synchronous control method, device and system. Background technique [0002] Pulse width modulation technology is widely used in AC drive system to improve the driving performance of the control system. Industrial applications require the inverter to have a wide range of speed regulation and a fast output frequency change. However, in some applications, especially medium and high-power applications, such as rail transit traction control, etc., the switching frequency of inverter switching devices is very low, so it is necessary to use segmented synchronous pulse width modulation technology to reduce current harmonics and improve inverter performance. Transformer control performance. [0003] The core idea of ​​the currently applied synchronous modulation method is to perform SVPWM fitting at a fixed position, and arrange the action sequence of the basic voltage vectors...

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Problems solved by technology

However, since the increase of the modulation ratio will cause the reference voltage vector to be located in the over-modulation region, the reference voltage at this time needs to be processed to achieve the purpose of modulation, so the modulation time of the modulation system and the modulation process will be increased to a certain extent. Complexity, and the running track of the stator is an irregular polygon, which makes the current impact larger and the waveform irregular

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