Fault Simulation of Divided Winding Rotor Synchronous Generator with Rectifier Excitation

• Published in: Electric power systems research Vol. 4; no. 4; pp. 255 - 264
• Main Authors: Sarkar, B.N., Verma, V.K., Mukhopadhyay, P.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.1981
• ISSN: 0378-7796; 1873-2046
• DOI: 10.1016/0378-7796(81)90002-X

A mathematical model of a divided winding rotor synchronous generator is developed on an actual field winding basis. The generator is assumed to have a rectifier excitation scheme for its field windings and is connected to an infinite bus. Transient stability studies were made by considering a three-phase short-circuit in the transmission line and multiple faults such as an external fault together with a sustained fault in the excitation channel. From these studies it is observed that quick reversal of the reactive winding current and the role of the torque winding current during faults, especially when the machine is operating at leading power factor, are most vital in maintaining stability. It is also found that the system becomes less stable when it undergoes a dual fault and stability is further reduced if the torque winding current is constrained to zero.