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- Title
Balancing control of neutral-point voltage for three-level T-type inverter based on hybrid variable virtual space vector.
- Authors
Jiancheng Zhou; Shanmei Cheng; Zhenyu Hu; Jiang Liu
- Abstract
A three-level T-type inverter has higher efficiency and lower output voltage harmonics compared with the traditional two-level inverter. However, neutral-point voltage fluctuation and common-mode voltage (CMV) can negatively affect the performance of the three-level T-type inverter. This study proposes a novel hybrid variable virtual space vector (HV²SV) strategy to mitigate this problem. Based on the virtual space vector scheme, new variable virtual small and medium vectors are reconstructed with the principle that the change of neutral-point charge of each virtual vector in a switching period is zero, and the adjustment factor is further added to the virtual vector to achieve the balance of the neutral-point voltage. At the same time, the vectors with a large CMV are eliminated to ensure that the CMV is minimised. Therefore, the HV²SV has excellent neutralpoint voltage balance control capability and common-voltage suppression at both high- and low-modulation ratios. Theoretical analysis, simulations, and experimental results demonstrate the effectiveness and feasibility of the proposed strategy for full modulation ratios.
- Subjects
VECTOR spaces; VOLTAGE control; PULSE width modulation transformers; ELECTRIC potential; LOW voltage systems
- Publication
IET Power Electronics (Wiley-Blackwell), 2020, Vol 13, Issue 4, p744
- ISSN
1755-4535
- Publication type
Article
- DOI
10.1049/iet-pel.2019.0759