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Zero-Sequence Circulating Current Reduction Method for Parallel HEPWM Inverters Between AC Bus and DC Bus.
- Source :
-
IEEE Transactions on Industrial Electronics . Dec2011, Vol. 59 Issue 1, p290-300. 11p. - Publication Year :
- 2011
-
Abstract
- In this paper, a real-time circulating current reduction method for parallel harmonic-elimination pulsewidth modulation (HEPWM) inverters is proposed. HEPWM techniques are often used in high-capacity inverters. For instance, in a hybrid microgrid, the inverters are employed to transfer power between the dc and ac buses. If the inverters are in parallel operation, the zero-sequence path can be established, and the zero-sequence circulating current will circulate among the inverters. The proposed method installs a cascade null-vector control system behind the conventional three-phase HEPWM modulator. The proposed null-vector control system can be disabled to save switching losses when the zero-sequence circulating current is small, whereas it can be enabled when the zero-sequence circulating current becomes large. The proposed method does not affect the line-to-line voltage waveforms of HEPWM inverters, and it can easily enable/disable the null-vector control system to provide bumpless transfer. Compared with the conventional HEPWM with zero-sequence harmonics elimination, the proposed method can provide an extra 15% modulation index range. Results that were obtained from both simulation and experiments confirmed the performance and effectiveness of the proposed method. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02780046
- Volume :
- 59
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Industrial Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 66421039
- Full Text :
- https://doi.org/10.1109/TIE.2011.2106102