Sensorless online measurements: application to variable speed drive systems
ISSN: 0332-1649
Article publication date: 2 January 2018
Abstract
Purpose
Sensorless online measurements, application of variable speed drives has been given a great attention, especially over the past few years. In most of the previous literates dealing with permanent magnet synchronous motor (PMSM) drives, the combination of inter-sampled behavior with high gain design approach has not been discussed yet. This paper aims to discuss this feature in-depth.
Design/methodology/approach
The study contains a different approach for an observer running with surface-mounted permanent magnet synchronous machine drives to implement sensorless control. Design of sampled data observer methodology for one kind of AC machine having non-linear model and backed by an elegant formal stability convergence analysis using the tools of Lyapunov stability techniques was highly recommended in scientific contributions, and it is yet needed to be solved.
Findings
In this study, a solution to observation problem is covered and developed by combining ideas from the high-gain design approach and inter-sample predictor based on stator voltage measurements. The output state currents are accessible only at the sampling instant to solve the problem of states observation at continuous-time mode. This allows to reducing the usage of online appliances, improving reliability of control design and saving costs.
Practical implications
The proposed observer is capable of guaranteeing an acceptable closed loop dynamic response over a wide range of operation region and industrial process for random initial conditions.
Originality/value
The output state predictor has been interred in constructing the innovation correct term to prove the robustness of the proposed observer against attenuated sampling interval. To validate the theoretical results introduced by the main fundamental theorem and prove the observer stability convergence, the proposed observer is demonstrated through a sample study application to variable speed permanent magnet synchronous machine drive.
Keywords
Acknowledgements
This work is partially supported by the Ministry of Higher Education and Scientific Research in Iraq to carry out this research with original results.
Citation
Al – Tahir, A.A.R. (2018), "Sensorless online measurements: application to variable speed drive systems", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 37 No. 1, pp. 29-53. https://doi.org/10.1108/COMPEL-10-2016-0453
Publisher
:Emerald Publishing Limited
Copyright © 2018, Emerald Publishing Limited