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UBC Theses and Dissertations

Preprocessing tools for transient simulation programs at UBC Dai, Nan

Abstract

This thesis presents three improvements on UBC's transients simulation programs. The first two are in connection with the existing off-line simulator MicroTran, while the last one is in connection with the newest frequency-dependent Z - Line model. MicroTran is a very powerful tool for power system transient analysis as well as steady-state analysis. It has been applied successfully for many years. However, it still needs improvements to extend its application. One improvement is related to statistical data analysis. This type of analysis is very helpful for applications such as insulation system design. In Chapter 1, an example of statistical analysis of switching surges during circuit breaker energization is used to implement the whole procedure of statistical analysis totally by software. Another improvement is related to the data input interface. The original data entry module mtData requires very strictly defined data formats and pre-calculations have to be made for some special components. This is inconvenient for those who are not familiar with these components or are not advanced computer users. In Chapter 2 the user interface for a graphical version (GUI) of data input cards is introduced and the data filter program being responsible for transferring data to the requirement format internally is explained. The newest frequency-dependent Z - Line model was recently developed by Dr. Castellanos and is based on space discretization. It separates the characteristics of the wave equation into two parts: constant ideal wave propagation and frequency-dependent wave distortion. For a practical implementation of the Z - Line model two questions needed to be solved. One was the development of a general fitting procedure to help the user obtain in an automatic manner the full frequency-dependent line impedance representation [Z[sup loss] ω]. The other aspect was to find a general relationship between the maximum section length and the highest frequency of interest in transient studies so that the program can automatically determine how many sections are needed for the specified accuracy of the simulation. In Chapter 3 the solutions to these two critical problems are explained in detail.

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