| Summary: | 碩士 === 國立臺北科技大學 === 電機工程系所 === 93 === The load of nonlinear element existed in a power system would caused current waveforms diverged from sine wave and distortion even if the power supply voltage is perfect sine wave. The large quantity of high power nonlinear loads in a power system is the major source which caused current and voltage distortion. The harmonic source from TRA(Taiwan Railways Administration) Power Substation almost caused by the rectify devices(such as Inverter) fixed on the electric locomotives which would caused phase sway and waveform distortion. The substation equipped with filter devices compensation for the phase sway and improvement in the waveform distortion, the component of harmonic and power factor will corresponding with “Control & Restraint standard” of TPC(TaiPower Company) requirement. The load of Electrification Railway is violent change in moment, the different types of electric locomotive( such as PP, EMU, GEC and GE) make the harmonic more complicated. The violent change of load current is the main source of 3th and 5th order harmonic components. This thesis is aimed at improvement of utilize passive harmonic filter for 3th and 5th order harmonic. The filter devices is to eliminate the harmonics in system and decrease harmonics pollution, to produce for compensate system power factor. Based on the requirement of identify system and harmonic source to design the parameters of double tuned harmonic filter. By inject each order harmonic current and total amount of harmonic current from PCC(point of common coupling) to the system, then check and measure to improve the distortion under requirement of TPC. When north city mass rapid transit of TRA, put into operation in future, the load will increase. The substation system should able to satisfy the compensate capacity requirements, avoid system from series/parallel resonant, and guarantee the system under safety operation, to correspond with economical profit.
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