Model Predictive Duty Cycle Control for Three-Phase Vienna Rectifiers With Reduced Neutral-Point Voltage Ripple Under Unbalanced DC Links

Under unbalanced dc links, the control of a three-phase Vienna rectifier is challenging. To deal with the unbalanced dc links, the optimal switching sequence model predictive control (MPC) regulates the neutral-point (NP) voltage through preselecting a redundant vector and grid current by reconstruc...

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Bibliographic Details
Published in:IEEE journal of emerging and selected topics in power electronics 2022-10, Vol.10 (5), p.5578-5590
Main Authors: Xu, Bo, Liu, Kaipei, Ran, Xiaohong, Huai, Qing, Yang, Shiqi
Format: Article
Language:English
Subjects:
Capacitors
Control methods
Duty cycles modification
Electric potential
Instantaneous current
Links
model predictive control (MPC)
neutral-point (NP) voltage ripple reduction
Optimization
Predictive control
Predictive models
Rectifiers
Ripples
Space vector pulse width modulation
Steady-state
Switches
Switching sequences
Unbalance
unbalanced dc links
Vienna rectifiers
Voltage
Voltage control
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Summary:Under unbalanced dc links, the control of a three-phase Vienna rectifier is challenging. To deal with the unbalanced dc links, the optimal switching sequence model predictive control (MPC) regulates the neutral-point (NP) voltage through preselecting a redundant vector and grid current by reconstructing duty cycles of the optimal switching sequence. However, its one-redundant-vector-per-control-interval characteristic leads to large NP voltage ripple. To solve this problem, in this article, a model predictive duty cycle control method is proposed for three-phase Vienna rectifiers under unbalanced dc links. First, we study the impacts of duty cycles on the variations of instantaneous current, and then, the three-phase duty cycles are derived by predefined objective function minimization. Second, considering both the operational characteristics and unbalanced dc links of the Vienna rectifier, a new modification method for duty cycles is presented. This method ensures the grid current quality and decouples the control of grid current and NP voltage. Finally, an MPC-based NP voltage control strategy is proposed to reduce the NP voltage ripple. Experimental results demonstrate that the presented method can effectively reduce the NP voltage ripple.
ISSN:2168-6777
2168-6785
DOI:10.1109/JESTPE.2022.3175583