A current regulator for charging and discharging of superconducting magnet

Abstract

The invention is a current regulator used in charging and discharging superconductive magnet, composed of a voltage unit, a transformer unit and a current unit, where the voltage unit is a voltage source converter whose DC side is a capacitor, the current unit is a current source converter with a DC side connected with a superconductive magnet, an AC output side of the voltage source converter is connected with a primary side of the transformer and that of the current source converter is connected with a secondary side of the transformer, and the transformer unit can be an ordinary transformer and also a transformer tapped on one side or both two sides. The invention can not only charge the magnet but release the electric energy stored in the magnet, and the charge and discharge voltage can be flexibly regulated. Its structure is compact and simple, its power density is high, and its bulk is small, and thus not only improves the property of the magnet charge-discharge system but can largely reduce the cost.

Description

Technical field: [0001] The invention relates to a current regulator used for charging and discharging a superconducting magnet, which belongs to the technical field of electric engineering. Background technique: [0002] Superconducting has the characteristics of zero resistance and high current-carrying capacity under a strong magnetic field, making superconducting magnets widely used, especially for large magnets used to generate strong magnetic fields in high-energy physics experiments, which have almost replaced all large-scale magnets. , conventional magnets that consume a lot of power; 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 power system stability. Superconducting magnets have been used like never before. [0003] The general operating current of superconducting magnets is at the kA level, and has a lar...

AI Technical Summary

Problems solved by technology

The problem is that not only two sets of equipment are needed for charging and discharging, but also the capacity of the charging equipment is very large if it is necessary to keep the magnet current constant and to complete the fast charging function, such as US Patent 6,157,094 "Superconducting magnet and its power supply device"; , figure 1 US2002 / 0030952 "Superconducting Magnet Discharge Method and Device" shown in the specific structure diagram, 10 and 11 are the magnet part, 19 is the magnet charging power supply, and other parts are the discharge part, that is, the chopper, which will replace the superconducting magnet. Convert current directly to voltage

It cuts the magnet current directly by the switches 22 and 20, which makes the switching loss very large, and the capacitor capacity required by the DC voltage 25 is very large, so that the excitation voltage of the magnet is large, which is not only unfavorable for the stability of the magnet, but also makes Magnet AC loss increases, increasing the operating cost of the magnet

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