Robust Sensorless Control of Electrically Excited Synchronous Machines Considering Inductance Uncertainties

For electrically excited synchronous machines (EESMs) used in automotive applications, the flux linkages are highly nonlinear due to magnetic saturation and cross-coupling effects. Therefore, the inductances strongly depend on the actual current operating point. For sensorless control and/or observe...

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Bibliographic Details
Published inIEEE transactions on industrial electronics (1982) Vol. 71; no. 8; pp. 1 - 9
Main Authors Pang, Yuebin, Knezevic, Jovan, Glose, Daniel, Hackl, Christoph
Format Journal Article
LanguageEnglish
Published New York IEEE 01.08.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Angular position
Convergence
Couplings
Cross coupling
electric vehicle
Electrically excited synchronous machine (EESM)
Inductance
Lookup tables
Lyapunov methods
Magnetic saturation
nonlinear flux linkage
Observers
Robust control
Rotors
Sensorless control
Stability analysis
Steady-state
Synchronous machines
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Summary:For electrically excited synchronous machines (EESMs) used in automotive applications, the flux linkages are highly nonlinear due to magnetic saturation and cross-coupling effects. Therefore, the inductances strongly depend on the actual current operating point. For sensorless control and/or observer design, the inductances are usually read from lookup tables (LUTs) according to the estimated <inline-formula><tex-math notation="LaTeX">(d,q)</tex-math></inline-formula>-axes currents, which are affected by errors in the estimated angular position, meaning inductance mismatches can arise despite having accurate inductances stored in the LUTs. These inaccurate inductances will themselves additionally deteriorate position estimate, as inductance evaluation and angle estimate are coupled and influence each other. In this article, the impact of this coupling effect on the stability of the sensorless control scheme is investigated. The conditions for stable convergence but also for potentially new (undesired) stabilizing points are analyzed, and a compensation method is proposed to overcome this problem and to ensure global convergence/stability of the observer. Experimental results on an EESM test bench confirm the stability analysis and the effectiveness of the proposed method.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2023.3322014