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- Title
Model predictive control for parallel threelevel T-type grid-connected inverters in renewable power generations.
- Authors
Xiangyang Xing; Chenghui Zhang; Jinwei He; Alian Chen; Zicheng Zhang
- Abstract
As the penetration of renewable power generation units connected to the grid increases, high power quality and high efficiency have been widespread concerned. The parallel 3LT2Is are necessary to improve the quality and efficiency of applications. The use of common dc-link without isolating transformers will cause the zero-sequence circulating current (ZSCC) problem. This study proposes a finite control set model predictive current control to suppress the ZSCC, balance the neutralpoint (NP) voltage as well as control the currents with fast transient response. The cause of the ZSCC generated in the parallel 3LT2I is analysed. The proposed ZSCC suppression technique is achieved through changing the redundant small vectors in the parallel 3LT2Is. Moreover, the coupling problem between the ZSCC and NP balance is solved by the amplitude comparison of NP voltage and ZSCC. As a result, better ZSCC suppression and NP voltage performance can be achieved in different output currents and filter inductance condition. The proposed method has been verified experimentally.
- Subjects
ELECTRIC inverters; PHOTOVOLTAIC power generation; PHOTOVOLTAIC power systems; ELECTRIC power distribution grids; HARMONIC distortion (Physics)
- Publication
IET Renewable Power Generation (Wiley-Blackwell), 2017, Vol 11, Issue 11, p1353
- ISSN
1752-1416
- Publication type
Article
- DOI
10.1049/iet-rpg.2016.0361