Abstract
Flux estimation is a key feature of the field-oriented control for the electrically excited synchronous machine which enables the high-performance, high-dynamic drive behavior. In this work, an electrically excited synchronous machine flux estimator based on a current and voltage model is proposed. In this case, the transition between the estimators is done with a fuzzy logic set of rules. The flux estimator based on the current model of the machine in this paper considers the saturation and cross-coupling effect in both axis and it is suitable for applications where a limited amount of the machine data is available. The flux estimator based on the voltage model is specially designed for the drives where high voltage and current ripple is present under normal operating conditions, e.g., like in cycloconverter applications. To exploit all the advantages of both models, a fuzzy logic transition is proposed based on multiple choices which manages the transition between the models based on a speed and torque reference. The proposed flux estimator is experimentally verified on a cycloconverter fed salient-pole electrically excited synchronous machine. The experimental results clearly show that the proposed flux estimator enables the accurate and stable operating conditions for different operating points of the cycloconverter-fed salient-pole electrically excited synchronous machine.
Highlights
High-performance electrical drives with electrically excited synchronous machines (EESMs) are often based on field-oriented control (FOC)
As stated in the Introduction, the goal of this paper is to develop a reliable flux estimator for salient pole EESM applicable in industry applications using cycloconverter drives
The proposed flux estimator consists of estimators based on current and voltage models of the machine with a fuzzy logic set of rules to manage the transition between them
Summary
High-performance electrical drives with electrically excited synchronous machines (EESMs) are often based on field-oriented control (FOC). This approach gives accurate machine inductances, i.e., the inductance functions in dependences of the machine currents, but the open circuit saturation curve in quadrature axis needs to be known Another type of flux estimators are those based on the voltage model of the machine. Compared to the estimators based on the current model, these estimators have better performance due to their robustness against the machine parameters, i.e., only the stator resistance needs to be known with sufficient accuracy This fact is especially true in medium and high-speed machine operating range where the voltage drop on the stator resistance is negligible compared to the back EMF. The developed flux estimator should use basic machine parameters that are commonly available in industrial applications, e.g., stator resistance and leakage inductance and direct axis saturation characteristics. Level curves imd FFiigguurree 44.. ((aa)) GGeenneerraattiioonn ooff tthhee iinndduuccttaannccee ffuunnccttiioonn iinn tthhee qquuaaddrraattuurree aaxxiiss aaccccoorrddiinngg ttoo [[1122]];; ((bb)) GGeenneerraatteedd iinndduuccttaannccee ffuunnccttiioonnss iinn tthhee qquuaaddrraattuurree aaxxiiss
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