AC/AC grid connection of six-phase wind power generator based on enneagon MMC converter. (June 2020)

• Record Type: Journal Article
• Authors: Zhou, Shijia; Rong, Fei; Sun, Wenlong; Huang, Sheng; Wu, Qiuwei
• Is Part Of: International journal of electrical power & energy systems. Volume 118(2020)
• Publication Date: 2020-06
• Subjects: Wind power -- AC/AC converter -- H-MMC -- Six-phase PMSG; Electrical engineering -- Periodicals; Electric power systems -- Periodicals; Électrotechnique -- Périodiques; Réseaux électriques (Énergie) -- Périodiques; Electric power systems; Electrical engineering; Periodicals; 621.3
• DOI: 10.1016/j.ijepes.2019.105810
• Languages: English
• ISSNs: 0142-0615

Abstract

Highlights: An enneagon multi-level converter (E-MMC) is investigated. Optimal phase shifting angle between two windings is determined. Control strategy based on proportional resonance are proposed. Abstract: In this paper, an enneagon multi-level converter (E-MMC) is proposed, which can directly connect six-phase wind power generator to AC grid. It has the advantages of high efficiency, small fluctuation of capacitor voltage of sub-modules (SMs), and no need of step-up transformer. The working principle of the converter is analyzed, and the optimal phase shifting angle between the two windings of the six-phase wind turbine is determined under different boost ratios. The voltage stability control strategy of the converter and the current tracking control strategy based on proportional resonance (PR) are proposed. The simulation and experiment verify the effectiveness of the proposed system and its control strategy from both steady and transient aspects.