A model predictive current control method for three-level inverter permanent magnet synchronous motor

By discarding voltage space vectors with large common-mode voltages and constructing virtual voltage space vectors, combined with deadbeat current prediction control, the problems of neutral point imbalance and computational complexity in three-level inverters are solved. This achieves effective suppression of common-mode voltage and neutral point potential, improving the steady-state performance and computational efficiency of motor control.

CN116667732BActive Publication Date: 2026-08-25HEFEI UNIV OF TECH
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Patent Information

Application Number
CN202310655535.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-05
Publication Date
2026-08-25
Estimated Expiration
2043-06-05

AI Technical Summary

Technical Problem

Traditional three-level inverters suffer from neutral point imbalance, which leads to increased harmonic content in the output voltage waveform, increased switching transistor voltage, and high-frequency oscillation of the common-mode voltage causing heat loss and bearing current, affecting the insulation performance of the motor. Furthermore, the model predictive current control method is computationally complex and has poor steady-state performance.

Method used

By establishing a new voltage space vector table, discarding voltage space vectors with large common-mode voltages, constructing a virtual voltage space vector with zero midpoint current, and employing a deadbeat current prediction control method and sector judgment, the amount of calculation is reduced, and a new voltage space vector is synthesized to suppress common-mode voltage and midpoint potential fluctuations.

Benefits of technology

It effectively suppresses common-mode voltage and midpoint potential fluctuations, reduces computational load, improves output waveform quality, reduces switching losses and heat losses, extends motor bearing life, and enhances control precision.

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Abstract

This invention relates to a model predictive current control method for a three-level inverter permanent magnet synchronous motor, comprising: establishing a new voltage space vector table; obtaining the electrical angle θ(k) and electrical angular velocity ω(k) of the permanent magnet synchronous motor at time k, and obtaining the stator current dq-axis component i. d (k) and i q (k); obtain the q-axis reference current i q * Given the d-axis reference current i d * =0; This yields the voltage space vector values ​​u along the α and β axes. α (k) and u β (k); Determine the sector where the voltage space vector is located, select the optimal voltage space vector, and then output the switching sequence through the switching table. This invention effectively suppresses common-mode voltage by discarding voltage space vectors with large common-mode voltages; by constructing a virtual voltage space vector, it effectively suppresses midpoint potential fluctuations, predicts the reference voltage space vector in the next cycle, reduces the selection range of candidate voltage space vectors, and greatly reduces the amount of computation.
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