زهرا معصومي

Considering the importance of proper operation of synchronous generators (SGs) in supplying the required electrical energy in diesel-electric locomotives, it is essential to study the fault detection, isolation (fault determination), and estimation methods in SGs. Due to the nonlinearity of the SG’s load and preva‎lence of rotor faults in these SGs, the purpose of this study is to investigate the methods of rotor faults detection in SGs and to provide an efficient solution independent a load for detection, isolation, and estimation of rotor faults of SGs used in diesel-electric locomotives. In the first step, due to the importance of modeling in fault diagnosis to investigate the behavior of the SG in the healthy and faulty conditions, an attempt has been made to extract the state-space model of the SG in the healthy condition by using the model of the equivalent electrical circuits. Then, the effect of a reduction in the cross-sectional area of wires in SG windings, air-gap eccentricity, and inter-turn short circuit fault in the field winding faults on the model parameters of the equivalent circuits is investigated, which leads to the extraction of state-space models. Using the extracted models, the fault detection method is proposed based on the formation of the residual vector using the parity space method for detecting a reduction in the cross-sectional area of wires in SG windings and air-gap eccentricity faults as additive faults. In the following, by considering the effects of occurring faults on the equivalent circuit parameters and the eigenvalues of the state matrix, the method for fault detection, isolation, and estimation based on the estimation of eigenvalues with the assumption of the constant rotor rotational speed and constant motion of the train is introduced. Finally, the dataset of experiments on SGs installed in diesel-electric locomotives is used to investigate the validity of the proposed methods.

ژنراتورهاي سنكرون , تشخيص عيب , جداسازي عيب , تخمين عيب , بردار مانده , فضاي برابري , عيب كاهش سطح مقطع در سيم‌پيچ‌هاي ژنراتور , عيب خروج از مركز روتور , عيب اتصال كوتاه در سيم پيچ ميدان تحريك

synchronous generators , Fault detection , Fault isolation , Fault estimation , Residual vector , Parity space method , A reduction in the cross-sectional area of wires in synchronous generator windings , Air-gap eccentricity fault , Inter-turn short circuit fault in the field winding

Zahra

Masoumi