Adaptive PLL for Frequency and Position Estimation of Electric Machines

This work proposes a new PLL (Phase-Locked-Loop) structure with adaptive filtering and control to improve frequency and phase estimation of Quasi-Type-1 Phase-Locked-Loops (QT1-PLL) for operation in conjunction with back-EMF estimators in position sensorless algorithms for the control of electric ma...

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Bibliographic Details
Main Authors: Monteiro, Jose Roberto B. de A., Martins de Oliveira, Gaspar Henrique, Medrano Luna, Ivan Santiago, Cury Alves dos Santos, Stefan Thiago, de Oliveira, Eduardo Mateus C. S.
Format: Conference Proceeding
Language:English
Subjects:
adaptive control
angular position tracking
Electric machines
Frequency control
Frequency estimation
frequency tracking
Harmonic analysis
Phase locked loops
phase-locked-loop
Power harmonic filters
Voltage measurement
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Description
Summary:This work proposes a new PLL (Phase-Locked-Loop) structure with adaptive filtering and control to improve frequency and phase estimation of Quasi-Type-1 Phase-Locked-Loops (QT1-PLL) for operation in conjunction with back-EMF estimators in position sensorless algorithms for the control of electric machines, as synchronous machines, specially permanent-magnet synchronous machines. An analysis of the structure and the limiting operating conditions of QT1-PLL and the proposed PLL is done. Experimental results are obtained, including unbalanced voltages, disturbances and voltage frequency variation, typically presented in variable speed electric machine systems. The obtained results show that the proposed structure significantly improves the sensibility of the PLL due to unbalanced voltages, achieving steady zero error due to ramp input frequency and phase, capable of operating in a wide input frequency range.
ISSN:2832-2983
DOI:10.1109/SPEC56436.2023.10407715