An Improvement Strategy of Voltage/Current Imbalance at Rail Traction Power

• Main Authors: Chun-Yen Chang, 張俊彥
• Other Authors: Wan-Tsun Tseng
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/wm5w9u

碩士 === 國立雲林科技大學 === 電機工程系 === 102 === As time evolves and the trend of eco-conscious rises, Taiwan railways administration (TRA) realizes railway electrification by converting three-phase power sources via the trail traction substations, and transmitting to the locomotives through the overhead lines. However, a locomotive is a large single-phase traction load which not only causes imbalanced three-phase power source but also affect the power quality. For this reason, an application of power electronic technology to rail traction substation is proposed in this thesis. Three traction substation scheme, the three-phase PWM rectifier, the three-phase half-wave rectifier and the three-phase full-wave phase-controlled rectifier are introduced respectively with the H-bridge inverter. This is followed by attempting to lower down the DC voltage for reducing the number of active switches on the inverter. The control strategy of inverter will achieve two sets of AC voltages that have quadrature phase. The circuit-simulating program PSIM is used to simulate the overall configuration and the simulated results are given to verify the theoretical analyses. The total harmonic distortions of all structures will also be presented in the end of this thesis.