Research On Networks Communication System Of Traction Power Supply Automation Of High-speed Railway

Our country's railway construction has entered a new development period at a high speed. The design and construction of High-speed Railway are further spreading out. In face of the competition of advanced technique from Japan, Germany, France and etc, it is significant for us to research on TPSAS (Traction Power Supply Automatic System) for High-speed Railway) with Self- Intellectual Property Rights. TPSAS with control automation and management information is the foundation of reliable operation of High-speed Railway power supply system, which can be instead of import and also can save foreign exchange, national investment, at the meantime, is the important technical equipment for the urgent need of High-speed Railway. The key problem is Communication to realize TPSAS. Communication problem has become the most kernel problem for the TPSAS research and development.It is very hard to realize the integration of management and control at a true meaning today because of the complex of the communication interfaces between PSDS (Power Supply Dispatching System), TSAS (Traction Substation integrated Automatic System) , PSMIS (Power Supply Management Information System), OHL's(Over Head Line) Section, Detecting Car, the Maintenance and Management Center of the Traction Power Supply, the Management Department in Railway Bureau, etc., the disorder of the information flow, and the undefined demand and assignment. The problem of " Isolated Island of Information" exists in the meantime. On the basis of taking into account of security and reliability of the System, according to the principle which the control information flow and the management information flow are separated thoroughly, the input and the output information flow of every sub-system of TPSAS is standardized, the interface and requirements of every sub-system are posed, then, the whole information flow of TPSAS is planed. According to the standardization requirement of railway, related information data dictionary is researched. According to the communication requirements of TPSAS information flow, on the basis of communication networks on service, the solution plan of networks structure for TPSAS was brought up.The real-time quality of the TPSAS is mainly determined by the real-time quality of networks communication of TSAS and control networks of PSDS. Through studying deeply Ethernet technique, combining the TSAS real-time needs of TPSAS, a new industrial control Ethernet solution plan: the Distributed and Exchanged Double-loop Optical Self -repaired Ethernet was brought out. The research of the plan was carried out as follow:①The communication unit and interface hardware of IED(Intelligent Electric Device) in TSAS was designed in detail.②The most short path algorithm based on real-time data passageway and the most short path table was brought up, the real-time quality of communication was raised.③The communication fault self-repaired and fault location algorithm was given, so that communication networks was easily upheld, TSAS with nobody on duty is easily realized, the plan may meet the requirement of net-broken time of industrial Ethernet.④With the idea of the most short path, the realization plan of PSDS communication networks based on common Ethernet was brought out.⑤Taking field environment into account, industrial distributed and exchanged net communication unit has been developed. So, the real-time quality and reliability of the PSDS control networks has been improved, true link without gap between PSDS and TSAS may be realized.With queue theory, the relation between the process ability of communication CPU and the size of input buffer and the relation between reach-ratio of input telegram and the size of input buffer have been discussed, so that the design principle of the hardware of communication interface was carried out. The principle provides foundation for the choice of communication CPU in hardware of Ethernet interface design.With OPNET, system emulation about bus-type, exchange-type, distributed-exchanged-type Ethernet in TSAS was carried out. The conclusion of emulation appears that the distributed-exchanged-type is better than bus-type and exchange-type in real-time quality, improve the time-delay determination of date transmission in Ethernet, avoid the date collision. With analysis method of Fault Tree, on the condition that the degree of reliability of component of the communication system is same, comparing net structure of PSDS on service with 2 ways double-loop SDH net structure posed in this paper , it was approved that the reliability of 2 ways double-loop net structure is better than net structure of PSDS on service. Comparing exchange-type Ethernet with distributed-exchanged-type Ethernet in TSAS, it was approved that the reliability of distributed-exchanged-type Ethernet is better than exchange-type Ethernet. Summarizing above researches, the plan that PSDS adopts 2 ways double-loop SDH net structure, TSAS adopts Distributed and Exchanged Double-loop Optical Self -repaired Ethernet, The most short path algorithm, the communication fault self-repaired and fault location algorithm are applied should be better choice for communication of TPSAS for High-speed Railway.On the basis of Distributed and Exchanged Double-loop Optical Self -repaired Ethernet, the realization process of IEC61850 in TSAS was studied in this paper, which is from building module of IED,establishment of dateobject and service, special projection of GOOSE/GSSE, application of MMS,real- time operation, design of hardware with the special requirements ofIEC61850, to research of IED and substation's configuration software.