Asymmetric Regular Sampling VSFPWM for Circulating Current Control in Paralleled Interleaved Multilevel Inverters

Parallel interleaved multilevel inverters (PIMIs) hold substantial potential for high-power applications, but their inherent circulating current issue leads to increased current stress and reduced system efficiency. This article focuses on phase circulating current (PCC) suppression in PIMIs. First,...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2024-11, p.1-11
Main Authors: Han, Jinyang, Li, Weichao, Zhou, Liang
Format: Article
Language:English
Subjects:
Asymmetric regular sampling (ARS) pulsewidth modulation (PWM)
Current control
Delays
Inductors
Legged locomotion
Multilevel inverters
parallel interleaved multilevel inverters (PIMIs)
phase circulating current (PCC) control
Predictive models
Pulse width modulation
Switches
Switching frequency
variable switching frequency
Vectors
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Summary:Parallel interleaved multilevel inverters (PIMIs) hold substantial potential for high-power applications, but their inherent circulating current issue leads to increased current stress and reduced system efficiency. This article focuses on phase circulating current (PCC) suppression in PIMIs. First, a PCC prediction model is proposed, considering a one-control-cycle delay when applying the asymmetric regular sampling (ARS) rule. By employing this model, appropriate redundant vectors are selected to achieve an approximately 50% reduction in PCC. Then, another PCC prediction model is developed, incorporating a two-control-cycles delay. Utilizing this model, an ARS-based variable switching frequency pulsewidth modulation (VSFPWM) is proposed to precisely control the peak value of PCC, and a method for determining the boundary of the switching frequency is suggested. The proposed VSFPWM explores the capability of the pulsewidth modulation (PWM) algorithm to effectively control PCC under low-switching frequency and low-carrier ratio conditions by using two degrees of freedom: vector selection and switching frequency. Finally, the effectiveness of the proposed strategy is validated by experiment with a 36-MVA inverter.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2024.3497342