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An improved synchronous reference frame filter for sliding mode observer position sensorless method of open‐winding pm generator system
Author(s) -
Wang Yu,
Hao Wenjuan
Publication year - 2019
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.22885
Subject(s) - control theory (sociology) , stationary reference frame , harmonics , low pass filter , observer (physics) , reference frame , filter (signal processing) , rotor (electric) , permanent magnet synchronous generator , position (finance) , phase locked loop , state observer , computer science , engineering , magnet , frame (networking) , voltage , physics , electronic engineering , induction motor , artificial intelligence , telecommunications , control (management) , quantum mechanics , computer vision , mechanical engineering , finance , nonlinear system , electrical engineering , economics , jitter
In view of the relatively low estimation accuracy in the low‐pass filter (LPF)‐based sliding mode observer (SMO) method, synchronous reference frame filter (SRFF)‐based SMO (without input LPF) method, and SRFF‐based SMO (with input LPF) method, an improved SRFF‐based SMO position sensorless method of the open‐winding permanent magnet generator (OWPMG) system is presented. This improved SRFF consists of a programmable eighth‐order low‐pass filter (8th‐PLPF), a traditional SRFF, and two phase‐locked loops (PLL1 and PLL2). Based on the synchronous angular frequency obtained by PLL2, the 8th‐PLPF together with the traditional SRFF can not only effectively filter out the harmonics in the output of the SMO but also achieve the fundamental back‐EMF without magnitude and phase angle errors. Then, based on the obtained accurate back‐EMF, the estimated rotor position angle can be obtained without phase shift. The OWPMG system using the improved method can work well in both steady‐state and dynamic conditions, which is verified by experimental results. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.