| Summary: | 碩士 === 國立清華大學 === 電機工程學系 === 87 === For Taiwan High Speed Railway System (HSR), the traction motor loads are provided by single-phase power supply. The great amount of power electronics application to the motor driving circuits such as rectifiers and inverters result in the harmonic current flow to the railway catenary system. This thesis studies the harmonic flow and related electromagnetic interference so to evaluate their influence.
The thesis comprises of two parts. In the first part, we present the construction of an equivalent circuit model including the evaluation of model parameters for the complete power supply system by using the ElectroMagnetic Transient Program (EMTP). Then by using the linear transformation technique, we derive systematically the circuit bus admittance matrix. Base on this matrix, we then evaluate the characteristics of harmonic power flow and simulate the harmonic resonance phenomena. Also, we calculate the amount of harmonic current injection into the Taiwan power system at the high-speed railway substation by accounting various types of transformer connection, which include the single-phase, V-, Scott, and Leblanc connections.
In the second part of the thesis, we study the following electromagnetic interference problems caused by harmonic and non-harmonic traction currents flowing to the autotransformer (AT) fed catenary system. (1) the rail potentials and the ground current leakage under the normal train operation, (2) the noise induced voltage on the nearby communication circuits by the equivalent psophometric currents, (3) the distribution of low-frequency (60Hz) magnetic field with account of the catenary feeder configuration. All these figures calculated are then compared with the relative standards to evaluate the impact of high-speed railway traction harmonic and non-harmonic currents on the local environment.
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