| Contactless inductively coupled power transfer (ICPT) technology overcomes the wear and tear electric spark and poor contact of traditional power transfer method. It makes the power supply system more secure, reliable, flexible, and eco-friendly, and has broad application prospects. This paper makes full use of its advantages and makes it applied in urban rail transportation power supply system.1. Based on the mutual inductance equivalent model of loosely coupled transformer, This article analyses the circuit, coupling transformer of Contactless inductively coupled power transfer (ICPT) system and has designed parameters that meet the requirements of urban rail transportation contactless current collection system. Also energy storage system of contactless current collection is studied, parameters of vehicle-mounted super capacitor pack are obtained. Main contents are as follows:2. Firstly, urban rail transportation contactless current collection system is reviewed, and the research status at home and abroad of urban rail transportation contactless current collection system is summarized. At last, the research significance and research content of this paper are given.3. The circuit structure of contactless inductive coupling is studied. Four kinds of compensation circuits are mainly studied whose principles are to increase the resonant capacitance in the primary and secondary side to increase the transmission power. And the influence that secondary quality factor and the coupling coefficient impact on voltage gain, the current gain and transmission power gain is analyzed。4. Bifurcation phenomenas of the four kinds of compensation topologies are studied, and the operating conditions are achieved. At the same time, considering that the primary resonance compensation capacitance is a function of load, in order to avoid changes of system resonance caused by load, phase control inductance dynamic compensation is added on the primary side so as to make the system work in resonance condition.5. The transformer of contactless inductively coupled power transfer is studied, whose coils are rectangular air-core coils. According to the self-induction and mutual inductance calculation formulas of a single-turn coil, the influence that air gap, coil size, offset affect coupling coefficient is calculated is studied. On the basis of the research on single-turn coil.the self inductance and mutual inductance calculation formulas of coils are derived under considering the coil conductor diameter condition. The influence that number of turns, air gap, coil size, offset affect the coupling coefficient is calculated and studied by using Matlab software.6. Combining the parameters of the urban rail transit parameters design flow chart of Urban rail contactless current collection is given. And parameters of urban rail contactless current collection system are calculated by using Matlab software. Also energy storage system of contactless current collection is studied, parameters of vehicle-mounted super capacitor pack are obtained. |
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