Super-conduction and normal-conduction compound flat-wave current limiting reactor and control method thereof

Abstract

The invention discloses a super-conduction and normal-conduction compound flat-wave current limiting reactor. The reactor mainly comprises a super-conduction inductance coil, a super-conduction switch combination, a forward wound normal-conduction inductance coil, a reverse wound normal-conduction inductance coil and a normal-conduction switch combination. A first super-conduction non-resistance switch in the super-conduction switch combination is connected in parallel with the super-conduction inductance coil. A second super-conduction non-resistance switch is connected in parallel with a super-conduction current limiting switch and then connected in series with the super-conduction inductance coil. The super-conduction switch combination and the normal-conduction switch combination are switched through the connection state of an inner switch to achieve combined serial and parallel connections among the super-conduction inductance coil, the super-conduction switch combination, the normal-conduction inductance coil and the normal-conduction switch combination, and accordingly, the super-conduction and normal-conduction compound flat-wave current limiting reactor with variable inductance values and variable resistance values is achieved. Application characteristics of single super-conduction reactors and single normal-conduction reactors are combined, efficient direct-current power grid smoothing and current limiting functions are provided, and the super-conduction reactor operation efficiency and the reactor economy are improved.

Description

technical field [0001] The invention relates to the field of reactors in electric power systems, in particular to a wave-smoothing current-limiting reactor for DC grid systems for power system protection. Background technique [0002] Reactors with smoothing or current limiting functions are widely used in DC grid systems. In particular, the introduction of superconducting materials with very high allowable operating current density and approximately zero resistivity makes the superconducting reactor wound by superconducting wires have the normal conductivity of ordinary conducting wires. The technical advantages that cannot be achieved by reactors, such as large operating current, low operating loss, small size, light weight, etc. At the same time, using the higher resistance of superconductors after quenching, superconducting reactors can also meet the requirements of current limiting and high impedance. Therefore, superconducting reactors with both smoothing and current...

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Problems solved by technology

In addition, the heat generated during the short-circuit fault current limiting process will cause the low-temperature refrigerant to rise sharply and even volatilize in large quantities, which may lead to thermal instability of the superconducting reactor and cause safety hazards, such as damage to the superconducting reactor Core superconducting winding components in

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