Brushless Three-Phase Synchronous Generator Under Rotating Diode Failure Conditions

Simulation of a Large Power Brushless Synchronous Generator (BLSG) With a Rotating Rectifier by a Reluctance Network for Fault Analysis and Diagnosis

“…The maximal and average values of current in the diodes are 1422A and 175A, respectively. The average current is determined over one electric period by: (5) where T = 1/f e = 1/275 s. This quantity is related to the thermal stress on diode.…”

“…30. Stray flux coil can also be placed outside of the machine [21]- [5]. This system is not studied in this work.…”

“…We present in the following paragraph a spectrum analysis of the pole flux wave form. This technique was used in [21] and [5] for stray flux coil systems (also called external flux sensors).…”

“…The magnetic behavior of the generator cannot be obtained. More recently, certain articles have described models for fault detection, such as [4]- [5] for BLSGs with a diode bridge. They are generally based on the "RL" model.…”

“…They are generally based on the "RL" model. The author of [5] proposed to take into account short-circuits between turns that are difficult to simulate. However, as in previous works, several important assumptions are imposed under which the effects of magnetic saturation, rotor saliency, coil span and slot harmonics are neglected.…”