Open AccessOver‐current protection method for PMSM VSI with small DC‐link capacitor
Author(s) -
Xu Yongxiang,
Huang Yingliang,
Zheng Boyuan,
Zhang Wentao,
Li Yong,
Zou Jibin
Publication year - 2018
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2017.0668
Subject(s) - link (geometry) , current (fluid) , capacitor , computer science , control theory (sociology) , electrical engineering , engineering , voltage , computer network , artificial intelligence , control (management)
In this study, an over‐current protection method for permanent magnet synchronous motor (PMSM) voltage source inverter (VSI) employing small DC‐link capacitor is proposed. Since VSI with small DC‐link capacitor has become popular for its long lifetime and compactness. However, the small DC‐link capacitor brings the risk of excessive voltage in the DC‐link capacitor when the traditional ‘all‐turn‐off’ over‐current protection is utilised. In order to avoid the damage for VSI caused by excessive pumping‐up voltage, based on the analysis for the ‘all‐turn‐off’ method, the proposed method could eliminate reversal current flowing into the DC‐link capacitor through switching logic. Consequently, the electro‐magnetic energy stored in PMSM windings is converted into mechanical energy and pumping‐up voltage is cancelled. Detailed analysis of the proposed method is presented. The effectiveness of the proposed method is verified by simulation and experiments.