This project is a master degree dissertation in electronics which looks at if weak relations may be used in TracFeed. TracFeed is a simulation tool meant to assist in the dimensioning of the power supply system for electrical railroads. The program was initially put together by Adtranz and is today further improved by Balfour Beatty Rail AB. When using weak relations there will be fewer truncations of the steps and so the response time will decrease. The objective of this thesis is to study how much time which may be gained in different types of simulations and in which way the result is effected due to weak relations. The theoretical part describes the fundamentals concerning electrical trains and how trains are modelled in TracFeed….
Contents
1 Introduction
1.1 Balfour Beatty Rail presentation
1.2 TracFeed presentation
1.3 Background
1.4 Purpose
1.5 Limitations
2 Theory
2.1 Traction basics
2.1.1 Train resistances
2.1.1.1 Running resistance
2.1.1.2 Gradient resistance
2.1.1.3 Curve resistance
2.1.1.4 Total train resistance
2.1.2 Acceleration/ Retardation
2.1.3 Limitations to the tractive effort
2.2 Simulation of power electronic systems
2.3 SIMPOW
2.3.1 OPTPOW
2.3.2 DYNPOW
2.3.3 DSL
2.3.3.1 Events and their effect on the time step
2.3.3.2 Deadband
2.3.3.3 Weak relations
2.3.3.3.1 Weak relations example
2.4 TracFeed
2.4.1 User input to TracFeed
2.4.1.1 Trains
2.4.1.2 Track
2.4.1.3 Drive path
2.4.1.4 Timetable
2.4.2 Description of the train models
2.4.2.1 Speed reference
2.4.2.2 Impact of the track layout
2.4.2.3 Electrical calculations
2.4.2.4 Structure of the code
3 Analysis
3.1 Method
3.2 Initial Changes to the code
3.3 Implementing weak relations
3.4 Test simulations
3.4.1 Malmbanan
3.4.2 Modification of Malmbanan
3.5 Simulation Results
3.5.1 Malmbanan results
3.5.2 Modified Malmbanan results
3.6 Conclusions and Recommendations
4 Thesis summary
5 Further Work
6 References
Appendix A: Input data for a small simulation
Appendix B: Changes to the code
Appendix C: C program
Revisions
3 Analysis
3.1 Method
3.2 Initial Changes to the code
3.3 Implementing weak relations
3.4 Test simulations
3.4.1 Malmbanan
3.4.2 Modification of Malmbanan
3.5 Simulation Results
3.5.1 Malmbanan results
3.5.2 Modified Malmbanan results
3.6 Conclusions and Recommendations…
Source: Malardalen University
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