4L-NNPC inverter control method and device based on improved finite control set model

By simplifying the prediction model and output level screening mechanism and combining the multi-objective cost function of sliding mode control theory, the control method of the 4L-NNPC inverter is optimized, which solves the problem of excessive computational burden and improves the dynamic performance and steady-state accuracy of high-frequency control.

CN121036559BActive Publication Date: 2026-03-03FUZHOU UNIV
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Patent Information

Application Number
CN202511539325.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-10-27
Publication Date
2026-03-03
Estimated Expiration
2045-10-27

AI Technical Summary

Technical Problem

Traditional finite control set model predictive control strategies in 4L-NNPC inverters result in excessive computational burden, failing to meet high-frequency control requirements. This leads to dynamic response hysteresis, excessive output current harmonic distortion rate, and flying capacitor voltage imbalance, making it difficult to balance real-time performance, control accuracy, and economy.

Method used

By employing a simplified prediction model and output level screening mechanism, combined with the multi-objective cost function of sliding mode control theory, and by collecting real-time data from the power grid and inverter, candidate switch states are screened to optimize the control output.

Benefits of technology

It significantly reduces computational complexity, improves system dynamic performance and steady-state accuracy, reduces computation time, reduces switching losses, improves current tracking accuracy and capacitor voltage balance, and reduces harmonic distortion.

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Abstract

This invention provides a control method and apparatus for a 4L-NNPC inverter based on an improved finite control set model. The method includes: real-time acquisition of the current three-phase grid voltage, current flying capacitor voltage, and current output three-phase current; calculation of the static reference current and a preliminary evaluation function; determination of a candidate switch state set through an output level screening mechanism, combining the preliminary evaluation function and the static reference current; for each candidate switch state, prediction of the corresponding state flying capacitor voltage and state output three-phase current at the next moment based on the current output three-phase current; calculation of the current tracking cost function and the balancing flying capacitor voltage cost function using a multi-objective cost function based on sliding mode control theory, generating an overall cost function; and selection of the candidate switch state that minimizes the overall cost function as the optimal control output for the 4L-NNPC inverter control. This invention significantly reduces computational complexity while improving system dynamic performance and steady-state accuracy.
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