A novel brushless de‐excitation system for synchronous generators using a buck chopper with a freewheeling discharge resistor

• Published in: IET electric power applications 2023-03, Vol.17 (3), p.314-329
• Main Authors: Ngaleu, Gildas Martial, Yeremou, Aurélien Tamtsia, Kom, Charles Hubert, Eke, Samuel, Nanfak, Arnaud
• Format: Article
• Language: English
• ISSN: 1751-8660; 1751-8679
• DOI: 10.1049/elp2.12267

A new de‐excitation system for advanced brushless excitation based on a synchronous generator is presented. The proposed system uses a discharge resistor in series with a freewheeling diode of a buck chopper. It improves the reliability of the entire power plant and can be used on several excitation systems. It can be used in case of programmed shutdown of the generator and also shows good results in voltage regulation without destroying the efficiency of the excitation system under nominal operation. An analysis of the system has allowed us to suggest a methodology to obtain the appropriate value of the discharge resistance to be used. The validation of the proposed system has been done through simulations in the Matlab/Simulink environment, supported by experimental tests. ♣ ${\clubsuit}$ The article deals with the output voltage regulation of alternators, an important issue in the field of electrical power systems. Its presents a new high‐speed brushless de‐excitation system (HSBDS) for an advanced brushless excitation‐based synchronous generator. ♣ ${\clubsuit}$ Two controllers are required for the advanced HSBDS systems with a more or less complex control system for the auxiliary (de‐excitation) control loop. Moreover, no study in the literature proposes a methodology to obtain an adequate value of the discharge resistance. ♣ ${\clubsuit}$ The proposed system, which is simpler than all those in the literature, uses a single controller and does not require a triggering device ♣ ${\clubsuit}$ The proposed article suggests a methodology to obtain the adequate value of the discharge resistance to be used.