Back-to-back multi-port converter predictive control method based on vector decomposition

By employing a predictive control method based on vector decomposition, the complexity of control for back-to-back multi-port converters under unbalanced port voltages is solved, achieving efficient, flexible power flow and stable control of the system, reducing system cost and improving conversion efficiency.

CN121840800AActive Publication Date: 2026-04-10UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-22
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

Existing back-to-back multiport converters, after direct integration with energy storage batteries, suffer from unbalanced port voltages and coupling of multiple control targets, resulting in complex system control and low efficiency.

Method used

A predictive control method based on vector decomposition is adopted. By obtaining reference values, modeling equivalent two-levels, establishing a predictive model and decoupling modeling, the control loss function is optimized and a switching sequence is generated to achieve decoupling of multiple control objectives and flexible power flow control.

Benefits of technology

Stable control of the AC generator and grid side was achieved under unbalanced port voltage, reducing system weight, size and cost, and improving conversion efficiency and dynamic response speed.

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Abstract

The invention discloses a back-to-back multi-port converter predictive control method based on vector decomposition, which comprises the following steps: firstly, acquiring a machine side stator current reference, a network side capacitor voltage reference and machine side and network side battery port power references, and then enabling a back-to-back multi-port converter to be equivalent to a back-to-back two-level converter; obtaining a simplified basic voltage vector for machine side and network side control; establishing a prediction model of machine-side stator current and a prediction model of grid-side inductive current, further establishing loss functions of machine-side control and grid-side control, respectively obtaining optimal basic voltage vectors and action time of the machine-side and the grid-side by optimizing the loss functions, and further synthesizing expected voltage vectors of the machine-side and the grid-side; thirdly, the back-to-back multi-port converter is equivalent to four virtual two-level converters related to a direct current port, output voltage vectors of the four virtual two-level converters are obtained through decomposition according to the scale factor obtained through calculation, and then the switching sequence of the back-to-back multi-port converter is obtained.
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Citation Information

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