DC/DC chopper suitable for superconducting magnetic energy storage

Abstract

The invention discloses a DC / DC chopper suitable for superconducting magnetic energy storage, comprising a first chopper, a second chopper, and a DC capacitor connecting the first chopper and the second chopper. The first chopper is characterized in that a first IGBT and a second IGBT are connected in series, a first diode and a second diode are respectively connected in parallel across the collector and the emitter of the first IGBT and the second IGBT, one end of a filter inductor is connected with the collector of the second IGBT and the other end to the positive of the DC capacitor, and the emitter of the second IGBT is connected to the negative of the DC capacitor. The second chopper is characterized in that a third IGBT is connected in series with a fourth diode, the third IGBT and the fourth diode are connected in parallel across the DC capacitor, a fourth IGBT and a third diode are connected in series and then connected in parallel across the DC capacitor, one end of a superconducting energy storage inductor is connected to the emitter of the third IGBT, and the other end is connected to the collector of the fourth IGBT. The DC / DC chopper can eliminate the high-frequency PWM pulse voltage of the superconductive energy storage inductor and improve the stability of the superconducting magnetic energy storage.

Description

technical field [0001] The invention belongs to the technical field of superconducting magnetic energy storage, and more specifically relates to a DC / DC chopper suitable for superconducting magnetic energy storage. Background technique [0002] Traditional power systems do not have large-capacity and fast access to electrical energy devices. Once the system is disturbed and the electromechanical power imbalance is caused, it may pose a threat to the system, and in severe cases, it will cause the system to collapse. Superconducting magnetic energy storage system (SMES) can provide fast response capacity for high-voltage transmission system, improve system stability, increase the limit transmission power of transmission lines, and can suppress fluctuations in grid frequency and voltage, and improve power supply quality. [0003] The superconducting magnet is a key component of SMES for energy storage, and it exchanges power with the AC grid through a power conditioning system ...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method belonging to the technical field of superconducting magnetic energy storage, thereby solving the problem that the prior art cannot eliminate the high-frequency PWM pulse voltage of the superconducting magnet, and the superconducting magnetic energy storage The technical problem of low stability of energy system

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