地铁直流牵引供电系统馈线保护研究电力系统及其自动化专业论文.docxVIP

AB ABSTRACT II II THE RESEARCH OF FEEDER PROTECTION OF DC TRACTION SUPPLY SYSTEM OF SUBWAY ABSTRACT With the rapid development of our economy and the problem of urban traffic jam becomes more seriously, developing urban railway in China is the best solution to the problems. DC traction supply system is an important part of the urban railway system. The DC protection and control play the key role in the whole DC traction supply system. The research of protection of DC supply system starts lately, and the development of China subway become quickly, some new problems appear now. When the supply system is out of order, the action of old protection device becomes slowly and less reliably. These all advanced new requests to the DC protection. So we should develop more reliable and intelligent DC protection device as quickly as possible. The protection device of subway DC traction supply system is fixed in traction substations. This paper introduced the mode of connection of traction substations. According to the non-linear characteristics of rectifiers, based on MATLAB/Simulink the simulation model of 24-pulse rectifier is build. Simple models of metro locomotive, supply line and the whole DC traction supply system also have been built. Then get current simulation waveforms when the supply system works normally. This paper build the short-circle fault model and the metro locomotive starting model of supply system, and get the simulation current waveforms. According to the simulation result, this paper analysis the characteristics of short-circle current and locomotive starting current, and raised that differentiate of the two styles current is the difficulty and emphasis of the DC protection. Considering the factors, the paper designs the DC feeder protection of subway, analysis the protection principle, whose score is DDL protection, gives the setting principle, and gives the configuration of protection software further. At last, this paper presents the hardware constitu