Method for suppressing high-frequency common-mode voltage of silicon carbide electric drive system based on multi-vector modulation type model predictive control

By employing multi-vector modulation model predictive control and dead-zone compensation measures, the problem of high-frequency common-mode voltage and current distortion in silicon carbide electric drive systems was solved, achieving suppression of common-mode voltage and reduction of current distortion rate, thus ensuring the safe and stable operation of the system.

CN115360902BActive Publication Date: 2025-11-25CHONGQING TAOKE ELECTRICAL RES INST CO LTD
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Patent Information

Application Number
CN202211200063.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-29
Publication Date
2025-11-25
Estimated Expiration
2042-09-29

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively suppress high-frequency common-mode voltage and current distortion in silicon carbide electric drive systems, which affects the safe and stable operation of the system.

Method used

A multi-vector modulation model predictive control method is adopted, which adds a set of non-zero voltage vectors with a phase difference of 180°. Combined with dead zone compensation measures, the voltage vector selection and action time allocation are optimized, and the compensated voltage pulse signal is output to the silicon carbide inverter to suppress common-mode voltage and current distortion.

Benefits of technology

It effectively suppresses common-mode electromagnetic interference across the entire frequency band, reduces the motor phase current distortion rate, and ensures the safe and reliable operation of the SiC electric drive system.

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Abstract

The present application relates to a kind of based on the common-mode voltage suppression method of silicon carbide electric drive system of multi-vector modulation type model, belong to new energy field.The method is: S1: according to the motor phase current distortion caused by traditional common-mode rejection method, establishes silicon carbide electric drive system model predictive control simulation model;S2: according to the influence of different voltage vector on silicon carbide device switching characteristic, propose the selection method of voltage vector in objective function;S3: according to the principle of modulation type model predictive control, theoretically deduce the action time of multi-vector;S4: propose corresponding multi-vector action time dead zone compensation measures, output voltage pulse signal after compensation to silicon carbide inverter, realize the common-mode voltage suppression and current distortion of silicon carbide electric drive system model predictive control.The present application method can effectively suppress the common-mode voltage in silicon carbide electric drive system, while reducing the total harmonic distortion rate of motor current.
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