Journal
IEEE ACCESS
Volume 9, Issue -, Pages 103524-103532Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2021.3098896
Keywords
Voltage control; Modulation; Loading; Voltage measurement; Heuristic algorithms; Sorting; Switches; Multilevel converter; Cascaded-H bridge converter; DC-link voltage balancing; modulation
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Funding
- Pukyong National University
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This paper proposes a modulation based voltage balancing algorithm for extending and improving the voltage balancing control capability of CHB converters.
Cascaded H-Bridge (CHB) converters have been widely employed in various applications, providing the advantages of modularity and multilevel voltage output. However, technically the CHB converters require isolated DC-link buses, which need to be regulated individually. In this context, a control scheme for the CHB converters features the voltage balancing algorithm. The voltage balancing control is typically performed by PI controller, where its control capability is limited by linear modulation region. In this work, the modulation based voltage balancing algorithm is proposed, which extends the balancing control capability and improves the dynamic performance. The proposed method is theoretically analyzed and validated through the simulation and experimental results.
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