Common-Ground-Type Single-Source High Step-Up Cascaded Multilevel Inverter for Transformerless PV Applications

Mathematics

卷:8

Yongheng Yang¹  Frede Blaabjerg¹  Kazem Zare²  Mehdi Abapour²  HosseinKhoun Jahan²  NaserVosoughi Kurdkandi²  SeyedHossein Hosseini² 

[1] Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark;

[2] Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz 51368, Iran;

关键词: cascaded multilevel inverter;    photovoltaic;    leakage current;   

DOI  :  10.3390/math8101716

来源: DOAJ

【 摘 要 】

The cascaded multilevel inverter (CMI) is one type of common inverter in industrial applications. This type of inverter can be synthesized either as a symmetric configuration with several identical H-bridge (HB) cells or as an asymmetric configuration with non-identical HB cells. In photovoltaic (PV) applications with the CMI, the PV modules can be used to replace the isolated dc sources; however, this brings inter-module leakage currents. To tackle the issue, the single-source CMI is preferred. Furthermore, in a grid-tied PV system, the main constraint is the capacitive leakage current. This problem can be addressed by providing a common ground, which is shared by PV modules and the ac grid. This paper thus proposes a topology that fulfills the mentioned requirements and thus, CMI is a promising inverter with wide-ranging industrial uses, such as PV applications. The proposed CMI topology also features high boosting capability, fault current limiting, and a transformerless configuration. To demonstrate the capabilities of this CMI, simulations and experimental results are provided.

【 授权许可】

Unknown