Double-three-level inverter open winding motor model control method

Abstract

The invention discloses a double-three-level inverter open winding motor model control method. The method comprises: sampling and observing the voltage and current rotating speed and the flux linkagesignal at the kth moment; obtaining a given value of a stator current d-axis component and a given value of a stator current q-axis component through a PI regulator, and obtaining an alpha-axis current given value and a beta-axis current given value under a two-phase static coordinate system through inverse Park transformation mathematical derivation; and substituting different to-be-selected voltage vectors to obtain a stator current prediction value at a k+1 moment, and optimizing the model through zero-sequence current suppression, voltage override jump control, neutral point potential balance control and switching frequency suppression. On the basis of vector control, the alpha-axis component and the beta-axis component of the stator current are independently controlled, prediction andfeedback tracking are conducted on the stator current in a model prediction control mode, zero-sequence current suppression, voltage override jump control, neutral point potential balance control andswitching frequency suppression are adopted, and multi-target optimization is achieved.

Description

technical field [0001] The invention relates to a motor model control method, in particular to a dual three-level inverter open-winding motor model control method. Background technique [0002] The common busbar structure of dual three-level inverters is similar to the common busbar structure of dual two-level inverters. When two inverters share a branch busbar, a large zero-sequence current will be generated, which will affect system performance. According to the zero-sequence current loop model, it can be seen that the magnitude of the zero-sequence current is closely related to the magnitude of the zero-sequence voltage of the two inverters. In Chapter 3, the direct addition of the zero-sequence voltage suppression item in the value function can start a certain However, when there are more optimization objectives, the value function cannot be biased towards a certain control item in each iteration, which will make it difficult to completely suppress the zero-sequence volt...

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Problems solved by technology

The midpoint voltage control can be realized by hardware or software methods: the current hardware control scheme mainly includes connecting a DC power supply of equal size in series on the DC side, and adding a Buck-Boost buck-boost circuit at the rectification output end to realize the dynamic balance control of the midpoint voltage. Using hardware control method will increase the cost and complexity of the system

[0005] At present, there is no research on the open-winding motor model control of dual three-level inverters in China. Two-level output voltage vectors are less than dual-three-level, with fewer control targets

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