Control method in use for charging and discharging currents of adjuster for superconducting magnet

Abstract

A control method for a superconducting magnet charging and discharging current regulator. The voltage unit (UV) adopts a bipolar control method. During the charging and discharging process, the phases of the voltage unit (UV) switches (S5), (S6), (S7), and (S8) are kept unchanged, and the phase of the voltage unit (UV) is passed The change of the conduction angle of the switch adjusts the duty cycle and controls the energy transmission of the current regulator; the commutation voltage provided by the current unit (UI) through the voltage unit (UV), the switching tubes of the two bridge arms of the current source converter At the moment of commutation, firstly give a trigger signal to the switch tube of the bridge arm to be opened, and then control the switch tube of the voltage source converter to generate a commutation voltage on the primary side of the transformer. After being converted to the secondary side, the commutation voltage The direction of the current flowing through the switching tube to be turned off is opposite to that of the current flowing through the switch; and since the commutation voltage is in the same direction as the current flowing through the switching tube to be turned on, the current flowing through the switch is increased; After the current passing through the switch tube to be turned off is reduced to zero, the switch tube is turned off. The invention can reduce switching loss.

Description

Technical field: [0001] The invention relates to a control method for a superconducting magnet charging and discharging current regulator. Background technique: [0002] The characteristics of zero resistance and high current-carrying capacity under a strong magnetic field make superconducting magnets widely used, especially large magnets used to generate strong magnetic fields in high-energy physics experiments. Superconducting magnets have almost replaced all conventional magnets with large volume and high power consumption; at the same time, with the development of superconducting power technology, especially micro-superconducting energy storage, it has been commercialized abroad and is widely used to improve power quality and increase Power system stability, etc., these have made superconducting magnets have been used unprecedentedly. [0003] The general operating current of superconducting magnets is at the kA level, and has a large inductance, which puts forward new ...

AI Technical Summary

Problems solved by technology

Due to the large current passing through the superconducting magnet, it can be seen from the above switching action that the switching tube of the current source converter always needs to be turned on and off to realize charging and discharging when the current is large. , this way of charging and discharging not only makes the switching tube on the secondary side bear a large switching loss, but also easily damages the switching tube

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