DC converter valve with pulse excitation device

Abstract

The invention relates to a DC converter valve with a pulse excitation device. The DC converter valve comprises a liquid metal heat exchange assembly, a pulse excitation assembly and a DC electric field switch, wherein the liquid metal heat exchange assembly and the pulse excitation assembly are connected through the DC electric field switch, the liquid metal heat exchange assembly comprises an insulation heat conduction layer, an insulation leather pipe and a liquid metal, an outer peripheral of a DC converter valve body is wrapped in the insulation heat conduction layer, an inner wall of the insulation heat conduction layer contacts with an outer wall of the DC converter valve body, an outer peripheral of the insulation heat conduction layer is wrapped in the insulation leather pipe, the liquid metal is filled into a gap between the insulation leather pipe and the insulation heat conduction layer, the pulse excitation assembly comprises a pulse transformer, a tap joint, a PWM PDM controller and a secondary pulse winding, and the PWM PDM controller is sequentially electrically connected with the pulse transformer, the tap joint and the secondary pulse winding. Compared with the prior art, the DC converter valve is advantaged in that the PWM is employed to control heat radiation of the liquid metal, and the DC converter valve further has properties of high flexibility, high efficiency, small size, low power consumption and long service life.

Description

technical field [0001] The invention relates to the technical field of liquid metal heat dissipation control, in particular to a DC converter valve with a pulse excitation device. Background technique [0002] DC transmission technology is the most effective technical means to solve the problems of long-distance, large-capacity transmission and grid interconnection. DC transmission technology is often used in high-voltage transmission projects. This technology mainly rectifies AC power into DC power at the converter station at the power transmission end. The line sends the electric energy to the power receiving end, and the converter station at the power receiving end inverts the DC power into AC power to supply the power load. Among them, the core equipment of the converter station at the power transmission end is the DC converter valve. Among the complete sets of equipment for the converter station at the power transmission end worth billions, its cost accounts for about 2...

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Problems solved by technology

[0004] However, the electromagnetic pump used for heat dissipation of the above-mentioned DC converter valve needs to be equipped with a large stator winding when transmitting large flow of liquid metal, which has an axial induction force. The corresponding electromagnetic pump has a large volume, which is not conducive to flexible operation. Economical It is also not conducive to saving costs from the perspective of

In addition, if you want to change the flow rate of liquid metal, you need to adjust the strength of the magnetic field or the magnitude of the current, and the controllable factor of this electromagnetic pump driving method is only the flow rate of liquid metal, and other state parameters such as the state and efficiency of the liquid metal cannot be controlled, which is not conducive to flexible control

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