Open AccessComparison analysis of low‐switching‐frequency‐based IPMSM sensorless drives considering regulators, observer and inverter non‐linearity
Author(s) -
Zhang Hang,
Liu Weiguo,
Chen Zhe,
Jiao Ningfei,
Zhao Dongdong
Publication year - 2019
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.815
H-Index - 97
eISSN - 1751-8679
pISSN - 1751-8660
DOI - 10.1049/iet-epa.2019.0007
Subject(s) - control theory (sociology) , observer (physics) , inverter , linearity , position (finance) , voltage , computer science , engineering , physics , electronic engineering , control (management) , finance , economics , quantum mechanics , artificial intelligence , electrical engineering
This study proposes an integration design of sensorless closed‐loop drives for rail transit application employing interior permanent magnet synchronous machine (IPMSM), which works under low switching frequency. Due to the long signal sampling period in high‐speed region, the individual back‐EMF observer cannot ensure the sensorless closed‐loop control stability. In order to increase the speed dynamic response and decouple the d – q axes currents accurately, a fast non‐singular terminal sliding mode control is designed. It combines a linear sliding mode factor with conventional non‐singular terminal sliding mode and is applied uniformly to position observer, speed and currents regulators. Then, considering the effect of inverter non‐linearity on position observer, the observed position error caused by dead‐time is analysed, and a compensation method based on q ‐axis voltage error is proposed. Based on the above methods, a comparison analysis of position observer, speed and currents regulators is given. Finally, a 3.7 kW IPMSM is tested to verify the feasibility of the improved sensorless method.