Model predictive control for parallel three‐level T‐type grid‐connected inverters in renewable power generations. Issue 11 (3rd July 2017)

• Record Type: Journal Article
• Authors: Xing, Xiangyang; Zhang, Chenghui; He, Jinwei; Chen, Alian; Zhang, Zicheng
• Is Part Of: IET renewable power generation. Volume 11:Issue 11(2017)
• Page Start: 1353
• Page End: 1363
• Publication Date: 2017-07-03
• Subjects: predictive control -- power grids -- invertors -- power supply quality -- electric current control -- voltage control -- transient response -- electric power generation; parallel three‐level T‐type grid‐connected inverters -- renewable power generation unit penetration -- power quality -- parallel 3LT2Is analysis -- common dc‐link -- zero‐sequence circulating current problem -- finite control set model predictive current control -- neutral‐point voltage -- current control -- fast transient response -- ZSCC suppression technique -- redundant small vectors -- NP voltage performance; Renewable energy sources -- Periodicals; 333.79405
• DOI: 10.1049/iet-rpg.2016.0361
• Languages: English
• ISSNs: 1752-1416

Abstract

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 3LT 2 Is 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 neutral‐point (NP) voltage as well as control the currents with fast transient response. The cause of the ZSCC generated in the parallel 3LT 2 I is analysed. The proposed ZSCC suppression technique is achieved through changing the redundant small vectors in the parallel 3LT 2 Is. 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.