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Reseach on Cophase Power Supply Technology

Author: ShuDaiMin
Tutor: WangXun
School: East China Jiaotong University
Course: Traffic Information Engineering \u0026 Control
Keywords: The same phase power supply Active filter Scott -type transformers Improvement program
CLC: U223.5
Type: Master's thesis
Year: 2009
Downloads: 245
Quote: 1
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Abstract


The traction load for the single-phase AC load , three - phase serious imbalance electrified railway traction power supply system , and the presence of reactive current . Traction transformer commutation join in order to reduce the impact of the three-phase unbalanced voltage of each power supply section , must be split-phase insulation separated . The limits locomotive insulator phase separation by a smooth continuous flow became weak link power constraints of high-speed , heavy-duty railway . Substation using the same phase power supply technology , integrated compensation current through the real-time detection system to control active filter , balanced three-phase filter reactive current , traction transformer primary side is no longer to rotation , substation single-phase power supply , do not set sub- phase insulation . Elaborated based on the V -type and the Scott transformer wiring principle and they in-phase power supply system , and active filters . By comparison, the Scott transformer - based system has a large advantage , This article mainly studies the same phase power supply system based on Active Power Filter and Scott Transformer . Discussed the system balance transform the relationship between the filter each port output current and load current , further analysis of the distribution ratio of active and reactive power between the grid and the filter , so as to arrive at a certain load under the filter must meet power capacity . The active filter command current generation method and the control method of the filter analysis , which focuses on single-phase converter works carried out a detailed analysis and study . This article with the MATLAB / SMIULINK the power system simulation component library and a detailed study of the system proposed by the modeling and simulation . Simulation results show that after balancing the electric power system side of the current waveform is a pure sinusoidal waveform of the three - phase symmetrical fully compensate the reactive power , proved balanced transformation mode and filter the correctness of the instruction current detection method , and verified the same phase supply the correctness and feasibility of the program . Finally, an improved compensation system construction scheme , can effectively reduce the cost of the device as a whole , the same simulation using MATLAB / SMIULINK new idea is correct and effective .

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CLC: > Transportation > Rail transport > Electrified railway > Power supply > Power supply technology
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