| Summary: | 碩士 === 國立清華大學 === 電機工程學系 === 90 === From north to south, the length of the operation route of Taiwan High Speed Railway (THSR) which has seven power substations is about 340 km. Every substation is supplied by TPC’s 161kV buses via three-phase double-circuit transmission lines. By Scott main transformer, the three-phase power is transferred to two single-phase power (2×27.5kV、60Hz) and then fed to the catenary system. Although the electrical system of Shinkansen Sysyem (SKS) is adopted by THSR, there are some differences between them. For example, the midpoints of autotransformers in THSR are directly grounded compared to SKS ones which are grounded via protection gaps.
Due to the above reason, the thesis analyzes and simulates the overvoltage phenomenon which may happen in the power system of THSR according to the relative data and assumptions. As for using ElectroMagnetic Transient Program (EMTP) to simulate the lightning surge, the thesis explains the modeling methods, parameters and the simulation results. Finally the thesis discusses the characteristics of overvoltage and evaluates the insulation coordination conditions of THSR according to simulation results.
At the present time, the adopted power system configuration of THSR is still in planning and construction phase. In order to provide a reference to THSR, the thesis analyzes and simulates possible overvoltage phenomenon according to the limited information we have.
Besides all above, the thesis systematically discusses overvoltage phenomenon including Temporary OverVoltage (TOV), Switching OverVoltage (SOV) and Lightning OverVoltage (LOV) on the basis of gathered information and publications. A new way for modeling the two-terminal-ungrounded voltage source to simulate the lightning induced voltage by EMTP is also presented, which contributes to the EMTP modeling technique.
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