학술논문
A Mathematical Structural Modulation Method for Neutral-Point Potential Balancing of Three-Level Neutral-Point-Clamped Converters
Document Type
Periodical
Source
IEEE Journal of Emerging and Selected Topics in Power Electronics IEEE J. Emerg. Sel. Topics Power Electron. Emerging and Selected Topics in Power Electronics, IEEE Journal of. 12(2):1573-1582 Apr, 2024
Subject
Language
ISSN
2168-6777
2168-6785
2168-6785
Abstract
To achieve the fast neutral-point (NP) potential balance of three-level NP -clamped (3L-NPC) converters, a mathematical structural modulation method is presented in this article, featuring fast balance capability, low computation, and easy implementation. In this method, the duty cycle is decomposed into the differential-mode component (DMC) and the common-mode component (CMC). The CMC is used to synthesize the ac output voltage while the DMC is adopted to control the NP potential. Based on the fractional-order sliding-mode control theory, the DMC is constructed. As a result, NP potential balancing in a pre-calculated time is achieved. Finally, the effectiveness of the proposed method is verified by experimental results.