عليرضا بوجاراراني

Synchronous generator can be considered as the most important component of the power grid. The brushless synchronous generator uses a separate synchronous machine with a fixed field and rotating armature. The output of the excitation armature is connected to a diode rectifier, and the rectifier output provides the DC current required by the main generator. Rotating diodes may experience open circuit or short circuit faults. These faults usually occur for reasons such as wear, high rotation speed, overvoltage, overcurrent, and so on. It is simply not possible to detect a rotating diode fault due to the moving part. pro‎mp‎t and timely detection of defective diodes is very important, because on the one hand, it prevents the spread of fault, and on the other hand, the cost of repairing the defective part will be lower if diagnosed in time. This thesis first examines the methods previously presented in investigating this type of error. Then, by modeling the excitation generator in the healthy condition of the diode bridge, an analytical model is obtained to calculate the excitation field current. This model is based on the equations governing the generator in the abc reference frame. The excitation armature current is then written to investigate the open-circuit and short-circuit fault. Then, by solving the field equation in these conditions, the excitation field current is obtained parametrically. In the next step, the parameters related to the model of a brushless synchronous generator are placed in the obtained equations and the results related to modeling and simulation are compared. Then, according to the results, a method for diagnosing the condition of the diode bridge is presented, and finally, the proposed method for detecting the rectifier fault of a brushless synchronous generator on a set in the laboratory of special machine and drive is reviewed.

ژنراتور سنكرون بدون جاروبك , يكسوساز گردان , آرميچر تحريك , ميدان (فيلد) تحريك , تشخيص خطا

Brushless synchronous generator , Rotating rectifier , Exciter armature , Exciter field , - Fault Detection