Dynamic wireless power supply system for tramcar and efficiency optimization control method of system

Abstract

Disclosed are a dynamic wireless power supply system for a tramcar and an efficiency optimization control method of the system. The system device comprises a first transmitting terminal circuit and a second transmitting terminal circuit on the ground, and a receiving terminal circuit mounted on the tramcar. First and second transmitting coils and a receiving coil of the system adopt a winding mode of 8-shaped coil rows, and two sub-coils of each 8-shaped coil have opposite winding directions. The first transmitting coil (LPl) and the second transmitting coil (LP2) are completely overlapped in the width direction, and overlapped in an offset manner in the length direction, and the offset distance is one quarter of the length of one single 8-shaped transmitting coil. According to the invention, the ratio of the effective values of currents of the two transmitting coils can be adjusted in real time, and the ratio of the effective values of the currents of the transmitting coils is the ratio of the system at optimum efficiency, so as to improve the efficiency of the system. By applying the method, the transmission efficiency of the dynamic wireless power supply system for the tramcar provided with the 8-shaped coil rows can be effectively improved through simple and convenient control, the power supply capacity of the system is reduced, reliability is high, and control is easy.

Description

technical field [0001] The invention relates to a dynamic wireless power supply system for a tram and an efficiency optimization control method thereof. Background technique [0002] In the past ten years, wireless power transmission technology has been widely used in many industrial fields due to its convenience, beauty and safety. Among them, the dynamic wireless power supply technology for trams is developing rapidly. The main composition and working process of the dynamic wireless power supply system of the tram are as follows: the transmitting end—the inverter on the ground converts the direct current into high-frequency alternating current through direct-ac conversion, and the alternating current output by the inverter is passed into the Among the transmitting coils placed along the ground running track of the tram, a high-frequency electromagnetic field is generated above the track of the tram; the receiving end—the receiving coil installed on the tram senses the hig...

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Problems solved by technology

However, the current dynamic wireless power supply system for trams has the following problems: 1. The transmitting coil is an "O"-shaped coil, and the high-frequency electromagnetic field at the center of each "O"-shaped coil is the largest, while the adjacent "O"-shaped coils placed along the way The high-frequency electromagnetic field at the position between the coils is very small, which is easy to cause large fluctuations in the output voltage and current, and cannot guarantee the effectiveness of power transmission, and the reliability is not high in practical applications

2. When the transmitting end circuit of the system uses two transmitting coils, the receiving coil moves to different positions along the trolley track, and the power pickup capabilities of the two transmitting coils are different: when the receiving coil moves to a position geometrically facing a certain transmitting coil , which mainly picks up the electric energy facing the transmitting coil, and the electric energy of the other transmitting coil is less transmitted to the receiving coil; as the tram moves, the two transmitting coils face the receiving coil alternately geometrically; and the current in the two transmitting coils Similarly, in the transmitting coil that transmits less electric energy, most of the electric energy is consumed by the internal resistance of the coil and dissipated in the form of heat energy, resulting in a decrease in the transmission efficiency of the system, especially in the process of high power and long-term operation of the system. System efficiency will lead to a large amount of power loss, which is not conducive to saving power and will also increase costs

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