| After the Jing-Guang and Jing-Hu high speed railway line was put into use, China hasbecome a country with the longest operation mileage, the fastest speed and the highestbuilding standard in the field of high speed railway.The specificity of traction load and thecomplexity of power supply system in high speed railway put forwarda higher requirementfor traction power supply technique compared with traditional power supply. Thedevelopment of intelligent substation techniques affects the power supply system of highspeed railway traction deeply. It can be predicted that intelligent traction substation，as aneffective measure for improving the efficiency and reliability of power supply, will becomea new trend of traction substation.This thesis studied the key techniques on constructing intelligent traction substation.Firstly, the effects of the specificity of the primary systemto the construction of thesecondary system were studied by contrastive analysis. And then the construction mode ofintelligent traction substation was suggested, based on which the construction of tractionsubstation communication network, the implement methods for the intelligent regionalcooperative autonomous technique based on feeding section, and the implantationtechnique for the open`architecture based generic bayIED were studied and developedintensively.In recent years, the researches on the intelligent substation have attracted wideattention and also make remarkable progress. With the general characteristic of the electricpower system, intelligent traction substation can learn the techniques and experiences fromthe intelligent substation.But high speed railway traction substation is different fromelectric sustation in several ways such as power requirements, connection modes, electricprimary equipment parameters, which will deeply affect the implementation andconstruction of intelligent traction substation automation system.This thesis presented anintelligent traction substation construction mode with feeding section as a sectionbycontrastive analysis. The construction mode constructed a hierarchical control and protectsystem consist of equipment level, station level and region level with the feeding section as a section. The protective devices were setted near the HV electric equipments. Generalcontrol cableswere replaced by optical network. In this mode, informations among thedevices in one station and among the stations in one feeding section were highly sharing,which facilitated advanced application functions based on feeding section. The proposedmode simplified the system configuration mode of traction substation automation systemand improved the security, reliability and economics of high speed railway traction.Highly sharingof information is the primary character of intelligent traction substation.The construction of communication network satisfying the performance requirements is oneof the key techniques to be solved during engineering application.The networksperformance indicators of communication real-time and delay deterministic, reliability andusability, and security and robustness were theoretical analyzed and the key factorsaffecting the performance were discussed and improved according to automationapplication of traction substation. Network construction schemes with the characteristic oftraction substation were presented, which devided the traction substation automationdevices into system level and device level. The station level networks were used to connectthe devices in the system level. And the process level networks were used to connect thesystem level and the device level.‘Data sampling and tripping over network’mode wasused which processed the advantages of high real-time property and high imformationsharing property. According to the characteristics of the network messages of cyclist data,sudden data and routine data and learning from the Internet network trafficmodelingmethods, a network traffic mathematical modeling method was proposed for subtractionstation, which stated that the sudden data, with Markov property, followed Poissondistribution and routine data, with self-similarity and heavy tailed distribution, could bemodeled by Heavy-Tailed’s Pareto distribution.OPNET software was used for dynamicsimulation of subtraction station network to test the feasibility of the method. Thecharacteristics of universally applicable networking scheme were analyzed.As an important part of intelligent traction substation, the implementation patterns ofintelligent regional cooperative autonomous technique based on feeding section wereresearched. AT fault location system was used to present a GOOSE based AT fault locationmethod, which fused the data synchrony and network communication together to ensurethereliability and high real time quality. Private channel and high accuracy GPS were not necessary for this method which reduced the instruments investment and acquired moreopenness and interoperability. The fault location principle of suck current rate in AT neutralpoint had the problems of section miscarriage and low fault location accuracy.Thecausation of fault location accuracy error was analyzed according to the local short circuittest data and practical application to propose a compensation method for fault locationaccuracy improvement, which had successfully used for AT fault location systems in manyhigh speed railways in China.Considering that the improvement of intelligent traction substation is a long andgradually process, open platform structure based bay level IED implementation method wasproposed due to the requirements of bay level IED. The method can support the existingnormal data acquisition and control output scheme and also can support the full digitalinput/output scheme based on information sharing facing the future. The IED instrumentsusing this method had passed the tests of national authority and the IEC61850interoperatetest and had been applied in the practical application.At last，the main work of this thesis was summarized and the development trendwasprospected. |
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