Abstract: This paper discussed the topology of in the three-level neutral point clamped cascaded rectifier (3LNPC-CR) for designing the Chinese Power Electronic Traction Transformer (PETT). To balance the DC-link voltage (Vdc) in 3LNPC-CR, a smooth switching technique is proposed in this paper. The controlling processes of each module are relatively independent when the proposed technique is ap...

proper operations of transformer have several issues such as; preventing of unscheduled removal’s, increasing of reliability and continues supply of consumer demand. this result would be obtained that load and harmonic orders of sensitivity transformer at intervals appropriate for next hours and days is predicted to by selecting optimal utilization coefficient, reduction life of transformer is ...

A new suite of traction power system simulator tools has been developed to meet the engineering and design requirements of railroad and rail transit projects. The simulator has been designed to deal with both dc and ac systems and to track closely with the latest technological developments and trends in the industry. For the dc applications, features include emulation of wayside energy storage ...

background with increasing incidence of traumatic fractures, the use of orthopedic intervention such as traction has increased. inappropriate traction care may cause substantial morbidity and delay the patient rehabilitation. objectives this study was conducted to evaluate the quality of care for patients with traction in the orthopedic unit of kashan's shahid beheshti hospital, kashan, iran. p...

Abstract At present, PWM rectifier is widely used in various high power and voltage situations because of its energy, low harmonic content, constant bidirectional energy. The energy supply system subway traction based on shows the topology a dual transformer with three winding transformers four rectifiers parallel, which superior to modular model. Finally, correctness control strategy verified ...

This paper presents the supercapacitor power management method for the Hybrid Electricals Vehicles.A simple zero-voltage switching(ZVS) interleaved boost power factor correction(PFC) AC/DC converter is used to charge the traction battery of an Hybrid Electrical Vehicle. The auxiliary circuit provides limited current to charge and discharge the MOSFETs output capacitors during turn-On times at z...

Recently, high-voltage and high power IGBTs (insulated gate bipolar transistors) have been increasingly used in industrial fields, and in tractions and transformer facilities, where GTO (gate turn-off) thyristors were generally used in the past. The major reasons for the increase in IGBT applications are because, compared to GTO thyristors, IGBTs have the advantage of being easier to handle due...

Low AC loss of the winding high-capacity high temperature superconducting (HTS) traction transformer is a very important link to introduce large capacity into commercialization. A new structure proposed for transformer. The HV windings are made double pancake coils (DPCs), which wound by 4.8 mm-wide tapes, and LV windings, 12 solenoid coils. electromagnetic characteristics analyzed H-for...