Wireless electric energy transmission adjustment method based on tramcar parking offset error

Abstract

The invention discloses a wireless electric energy transmission adjustment method based on a tramcar parking offset error. The method comprises the following steps of A, setting the parking precision of a tramcar, and analyzing a distribution rule of errors between tramcar parking positions and target positions; B, integrating efficiency and probability density at different parking positions, and designing an optimized coil through using an integral efficiency expectation as an optimizing target on the condition of a parking offset normal distribution rule; and C, performing optimization designing on the dimension of the coil. According to the method, in designing a coupling coil of a tramcar wireless charging system, according to a parking offset error distribution characteristic, the efficiency expectation is used as the optimizing target; through optimization searching designing on the length and width of the coil and an original-side coil prolonging design, an expected efficiency value is realized on the condition that an offset of a coil which is fixed to the tramcar and ground occurs, thereby ensuring efficiency and transmission power of a wireless charging system and realizing long-term optimal efficiency of the system.

Description

technical field [0001] The invention relates to the application of a wireless power transmission technology in trams, in particular to a wireless power transmission regulation method based on tram parking offset errors. Background technique [0002] At present, in the wireless power transfer system (Wireless Power Transfer System, WPT), the overall efficiency of the system can be improved by designing the coupling coil; the core part of the wireless power transfer system - the coil, unlike the transformer, is two separate parts , through the high-frequency current in the primary coil, a high-frequency magnetic field is established, and the secondary coil generates an induced current through electromagnetic induction in the high-frequency magnetic field, and energy is transmitted in this way. The primary and secondary sides improve the power factor and efficiency of the system through series compensation capacitors. Because the coil is wound by copper wire, and there is high...

AI Technical Summary

Problems solved by technology

In the prior art, the efficiency of no offset (or the maximum offset) is as follows figure 1 , figure 2 The positional relationship under the two extreme conditions shown in the prior art is to use the efficiency under these two extreme conditions as the optimization target, and carry out anti-offset design for the length and width directions of the coil, and the designed coil is Square coil; however, in the above technical solution, the designed coil only considers the efficiency of a certain point as the optimization goal, and the designed coil is the optimal solution at this point

And because the coil deviation exists in each position, so the above-mentioned design method lacks the overall consideration, when it is applied to the tram parking, because there is a certain parking offset error when the tram is parked, it will cause the fixed position on the car, The coils on both sides of the ground cannot be completely aligned, which affects the efficiency and transmission power of the wireless charging system. In addition, the existing technical solutions are not carried out according to the actual situation that the train only has a single offset relationship in the forward direction, so the obtained coil It is a square, which is not the most reasonable optimization goal and cannot achieve the purpose of maximizing efficiency

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