Superconducting energy storage-retired battery combined compensation low-temperature electric energy conversion and current limiting circuit

Abstract

The invention discloses a superconducting energy storage-decommissioned battery combined compensation low-temperature electric energy conversion and current limiting circuit which comprises a superconducting current limiting type direct current circuit breaker sub-module, a superconducting energy storage compensation sub-module and a decommissioned battery compensation sub-module. The superconducting current-limiting DC circuit breaker sub-module comprises a main circuit unit and an auxiliary circuit unit. The superconducting energy storage compensation submodule comprises a superconducting energy storage magnet and a low-temperature power electronic superconducting converter; the retired battery compensation sub-module comprises a retired battery and a low-temperature power electronic battery converter; according to the invention, the superconducting fault protection device and the superconducting hybrid power compensation device are combined, and the existing low-temperature environment of the superconducting power device is utilized to cool the power electronic device, so that a low-temperature electric energy conversion and current limiting circuit system with high power supply quality and low operation loss can be realized.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a low-temperature electric energy conversion and current limiting circuit for joint compensation of superconducting energy storage and decommissioned batteries. Background technique [0002] With the continuous development of the power system with new energy as the main body, the DC power grid suitable for large-scale new energy access is also becoming more and more popular. Since most of the power conversion devices in the DC grid are composed of power electronic devices, the reliability of the system is low and the failure rate is high, so the fault protection device of the DC grid is very important. Currently, the most widely studied protection devices are mainly DC circuit breakers and DC current limiters. Compared with alternating current, direct current has no natural zero crossing point, which increases the difficulty of designing DC circuit breakers. Traditional mechanical...

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Problems solved by technology

[0004] At present, the research on the fault protection device and power compensation device of the DC power grid still stays on the research of a single device, and there is no public report on the combination of the superconducting fault protection device and the superconducting hybrid power compensation device.

At the same time, using the existing low-temperature environment of superconducting power devices to cool power electronic switches can realize low-temperature switching devices with higher operating power and lower operating losses, but the combination of superconducting power devices and low-temperature power electronic modules has not yet been seen. technical research

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