期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 36, 期 8, 页码 8575-8582出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3051044
关键词
Voltage control; Modulation; Reactive power; Switching loss; Switches; Inverters; Voltage fluctuations; Hybrid control method; neutral-point (NP) voltage fluctuation; three-level inverters
资金
- MOST [2018YFB0106300]
The article proposes a hybrid control method that combines zero-sequence voltage regulation with the decomposition of modulation waveform, effectively reducing the neutral-point voltage fluctuation in three-level inverters and validating its effectiveness in experiments conducted on a 10-kVA three-level platform.
Neutral-point (NP) voltage fluctuation is an inherent problem in three-level inverters. Without any control measures, the NP voltage will deviate, and the dc bias and ac oscillation can be observed, which may lead to the failure of power devices and capacitors, so as to damage the system security. In this letter, a hybrid control method is proposed, which it combines zero-sequence voltage regulation with the decomposition of modulation waveform organically. This carrier-based method is simple with lower switching loss due to the unchanged switching events per switching cycle. Experiments are carried out in a 10-kVA three-level platform, which demonstrate the validity of proposed method.
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