A New Technique for Connecting a Dual Excitation Synchronous Generator to the Power Grid

Roberto De Fazio, Ayman Alerksousi, Lorenzo Spongano, Bassam Al-Naami, Abdullah Al-Odienat and Paolo Visconti ()
Additional contact information
Roberto De Fazio: Department of Innovation Engineering, University of Salento, 73100 Lecce, Italy
Ayman Alerksousi: Department of Electrical Power Engineering, Damascus University, Damascus P.O. Box 30621, Syria
Lorenzo Spongano: Department of Innovation Engineering, University of Salento, 73100 Lecce, Italy
Bassam Al-Naami: Department of Biomedical Engineering, Faculty of Engineering, The Hashemite University, Zarqa 13133, Jordan
Abdullah Al-Odienat: Department of Electrical Engineering, Mutah University, Al Karak 61710, Jordan
Paolo Visconti: Department of Innovation Engineering, University of Salento, 73100 Lecce, Italy

Energies, 2023, vol. 16, issue 24, 1-24

Abstract: Due to an increasing demand for electric power and changes in the typology of loads, stability has become a major concern in power systems. As the system stability is directly related to the response of the connected generator, recent research has focused on enhancing generators’ stability and improving their response to load variations. This study focuses on adding another excitation winding on to the q -axis, perpendicular to the conventional excitation winding on the d -axis, to control both active and reactive power. This paper studies and compares the performance of the dual excitation synchronous generator (DESG) to conventional synchronous generators. The mathematical equations are derived, and a mathematical model is then developed. The experimental tests have been conducted using a laboratory model consisting of a two-phase synchronous generator driven by a DC motor with different loads. The obtained results and radial diagrams for the different loading types are presented and evaluated. Therefore, a new approach has been designed to connect the DESG directly to the power grid without any electronic components using a special coupling that works in one direction. Two perpendicular excitation coils, d and q , were formed from the existing coils, and the tests were carried out on all loads, ensuring that the revolving angle (i.e., the stability angle φ) was fixed. The results show that the proposed method offers significant cost savings, potentially amounting to 15–20% of the unit price. The experimental results confirm that the DESG significantly improves the generator stability by maintaining a constant rotor angle δ, which requires using an automatic angle regulator (AAR) in addition to the conventional automatic voltage regulator (AVR).

Keywords: dual excitation synchronous generator; DESG mathematical model; DESG characteristics; DESG two-axis flux linkage equations (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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