Simulation&Analysis Of Metro Traction Power System

Traction power supply system is an important part of the metro power supply， providingelectric power to the electric vehicle directily. It is a guarantee of the electric vehicle to runnormally and safety. Power Supervisory Control and Data Acquisition（PSCADA） system ofthe metro system is a good way to promise the metro system to be operated efficiently. It isalso an important method to achieve transport function. The PSCADA system needs to bere-built under different applications. Simulative design was made in this paper while thetraction power system was focused on. The pantograph is the only electric current receiver tothe catenary. It is also a key link in the traction power system. The contactor strip is thecomponent of the pantograph that contacts directly to the contact wire. It is easy to be wornout particularly when the electric current flows inside of. So it needs to be replaced quiteoften to ensure its safety use. Researches show that temperature raises of the contact strip isthe final reason that causes the abrasion. Therefore，3D temperature field simulation&analysis of the pantograph was another emphasis in this paper. Main work included in thispaper is as follows:1. A simulative design of PSCADA system was finished with IAP configurable software，inside which the power system of Fuzhou metro line1was made the object and the tractionpower system was the focus. To realize this simulative design, a real-time data base projectwas built, logic programs were compiled and human-machine interface was degined. Thesimulative design has realized the four remote functions and other concerning basic functions.Moreover, working conditions of the vehicle carried electrical appliances were counted intothe design, reserving a SCADA module interface for the vehicle carried electrical appliancesand proposing the idea of computer monitoring of the pantograph key parameters. It is afeature of this paper.2.3D finite element (FE) model of the pantograph collector head was established with APDL.After the loads analysis of the collector head and some other equivalent processing， a cyclicloading and solution program was compiled to simulate the temperature rise process when thecontact strip is under current carrying and slids along the contact wire. Moreover， imitatingexperimental circuit was setup to verify the simulation model.3. Parametric human-machine interface was built with Visual Basic， making the VB callANSYS to proceed FE calculation and analysis. After the FE calculation，the current vector，the basic law of the temperature rise of the contact strip were analyzed. The3D temperaturefield of the contact strip was also studied, including the3D isotherm and thermal gradientvector analysis. All these paves the way for further research of the contact strip temperaturefield and laying the foundation for the life prediction of the contact strip.4. Main influence factors of the temperature rise of the contact strip analysis after calculations.Influences of heat sources， materials， working condition and the stagger of the catenary was repectively analyzed. With the method metioned in this paper, further analysis andresearches would be made to be referenced for the contact strip production, material selection,the catenary construction and so on.