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Enhanced method of rotor speed and position estimation of permanent magnet synchronous Machine based on stator SRF-PLL
, P. Raja, M.P. Selvan
Published in Elsevier B.V.
2017
Volume: 20
   
Issue: 5
Pages: 1450 - 1459
Abstract
A stator flux oriented synchronous reference frame - phase locked loop (SRF-PLL) is proposed for the precise computation of rotor speed and position of permanent magnet synchronous machine (PMSM). A direct method of rotational speed computation based on the stator electromotive force (EMF) is initially formulated. Using the speed as a reference to the inverse Park and Clarke transformation blocks, the three-phase positive sequence stator flux is derived. A pre-stage low pass filter (LPF) is implemented to cancel out the ripples in the d-q components of the stator flux introduced by the dynamic operating conditions of inverter non-linearities and grid disturbances. The estimated three-phase positive sequence stator flux is used to compute the rotor position by aligning the total stator flux along the direct axis through a PLL block. Provision of the frequency amendment and ripple cancellation outside the PLL block results in a fast-dynamic response with an enhanced frequency adaptable capability. To validate the effectiveness of the proposed method, the sensorless vector control of grid integrated PMSM based wind-driven generator (WG) is analytically verified using the PSCAD/EMTDC simulation tool under various dynamic operating conditions such as wind speed variation and grid disturbances. © 2017 Karabuk University
About the journal
JournalData powered by TypesetEngineering Science and Technology, an International Journal
PublisherData powered by TypesetElsevier B.V.
ISSN22150986