| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 96 === The purpose of this thesis is to implement a testing system of phase modules which are used in railway traction inverters. The proposed testing system is composed of a switch-mode rectifier（SMR）and a bidirectional dc-dc converter. By using pulse-width-modulation technique, the testing system provides electrical conditions that are simular to real operation for the under-tested phase modules. Under these conditions, the dielectric and conducting capabilities of the under-tested phase modules can be assessed without troublesome field test. To improve the power quality of the testing system, a single-switch SMR is deploied at the front stage which provides the dc link voltage. Cascading a buck and a boost converters to form a bidirectional dc-dc converter, the second stage works as a controllable ac current source for the conducting testing with only few power consumption. For evaluating system efficiency, consumption of each element, such as diodes, switches, capacitors, and inductors, is analyzed carefully in this thesis. The testing system is controlled by a digital signal processor（TMS320F2812）, which provides the suitable PWM signals for the switches in the system according to the testing conditions. Both simulation and experimental results are shown in this thesis to verify the validity of the proposed testing system. The testing specification of this system is based on the voltage of 1000V and the current of 10A.
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