Active balancing optimized topology and voltage balancing control strategy for three-level inverters with mid-point potential

CAI Liang; ZHANG Chunyan

doi:10.12299/jsues.24-0034

Volume 39 Issue 1

May 2025

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CAI Liang, ZHANG Chunyan. Active balancing optimized topology and voltage balancing control strategy for three-level inverters with mid-point potential[J]. Journal of Shanghai University of Engineering Science, 2025, 39(1): 28-36. doi: 10.12299/jsues.24-0034

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CAI Liang, ZHANG Chunyan. Active balancing optimized topology and voltage balancing control strategy for three-level inverters with mid-point potential[J]. Journal of Shanghai University of Engineering Science, 2025, 39(1): 28-36. doi: 10.12299/jsues.24-0034

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Active balancing optimized topology and voltage balancing control strategy for three-level inverters with mid-point potential

doi: 10.12299/jsues.24-0034

CAI Liang,
ZHANG Chunyan^,

School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

Received Date: 2023-11-30
Publish Date: 2025-05-19

Abstract

Abstract

Aiming at the problem of unbalanced mid-point potential in T-type three-level inverters, the principle of unbalanced mid-point potential in traditional T-type neutral point clamped (NPC) three-level inverters was investigated. To address the mid-point potential imbalance caused by voltage variation on DC side, an optimized topology with an active mid-point potential balancing strategy and a fuzzy PI control were proposed. A simulation system model of the optimized topology T-type three-level inverter was established by Matlab/Simulink, simulation analyses with different control strategies were conducted, and a grid-connected experimental platform was set up to validate the proposed methodology. The simulation and experimental results demonstrate that the fuzzy PI control under the optimized topology can effectively suppress the mid-point voltage fluctuations, with the advantages of fast dynamic response and high response precision, enhancing the disturbance resistance and stability of the inverter system.
- three-level DC conversion topology,
- mid-point potential balance,
- fuzzy control,
- balanced circuit

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References(17)

References

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