A segmented non-contact power supply sending device for rail cars and its control method

Abstract

A segmented non-contact power supply transmitting device for a rail vehicle and a control method thereof, the power transmitting device includes an electric energy conversion device connected to a power supply bus, and a plurality of transmitting coils connected to the electric energy conversion device; the segmented power supply transmitting coil is composed of a series Composed of multiple sets of sending coils, the power conversion device and the segmented sending coils are connected through power distribution switches and corresponding single-pole double-throw switches; the control method of the device is: when the receiving coil is about to enter the sending coil, make the sending coil When the receiving coil is fully within the range of the sending coil, only the sending coil is powered to supply power to the receiving coil; when the receiving coil straddles two adjacent sending coils, the two coils are powered on at the same time. It accepts coil power supply and realizes smooth switching between single coil power supply mode and double coil power supply mode; it can carry out continuous power transmission with stable transmission power to the mobile rail vehicle receiving device, with small power transmission loss and high efficiency.

Description

technical field [0001] The invention relates to a non-contact electric energy transmission technology, in particular to a rail car single-power segmented non-contact power supply sending device and a control method thereof. Background technique [0002] The traditional form of power supply for rail cars is contact power supply (such as contact power supply through catenary or third rail), which is easy to cause carbon deposition and wear at the contact point, and may cause dangers such as arcing and electric shock. For this reason, people have proposed a non-contact power supply technology for rail cars based on non-contact power transmission technology, which reduces the difficulty of maintenance of the power supply system and reduces the danger caused by exposed power supply lines. [0003] The rail car non-contact power supply system is divided into two parts: the ground sending device and the vehicle receiving device. The sending device is mainly to convert the electric...

AI Technical Summary

Problems solved by technology

However, when the impedances of the parallel branches of the two sending coils are different, the current phase of the two sending coil branches may change, causing the magnetic fields of the two power sending coils placed in close proximity to cancel each other, reducing the power and efficiency of power transmission

In addition, in the case of constant voltage power supply on the primary side and the use of series compensation topology, the no-load or low impedance of the segmented power supply coil may also cause excessive current in the primary side loop and damage to devices and power supplies, thus seriously affecting the quality of rail transit. efficiency and safety

[0007] If an AC constant current power supply is used for power supply, since the impedance parameters of the two parallel transmitting coils are changed by the position of the receiving coil coupled with them, the impedance of the transmitting coil close to the receiving coil becomes larger, and the impedance of the transmitting coil far away from the receiving coil becomes smaller; On the contrary, the current of the sending coil farther away from the receiving coil increases, and the current of the sending coil closer to the receiving coil decreases, which reduces the power obtained by the receiving coil and affects the power supply stability and operation stability of the rail car.

[0008] In addition, the non-contact power supply system usually uses a single power supply. When the power supply fails, it cannot provide power to the sending coil, and the rail car cannot run due to power loss, which will also affect the normal operation of rail transit.

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