Coupling reactor high-voltage direct current fault current limiter

Abstract

The invention provides a coupling reactor high-voltage direct current fault current limiter. The coupling reactor high-voltage direct current fault current limiter comprises: a coupling reactor unit,a current limiting unit, an energy absorbing unit and a DC circuit breaker unit. The coupling reactor unit is composed of a coupled reactor and a line. When a short trouble is generated, the primary inductor of the coupling reactor and the precharge capacitor of the current limiting unit oscillate, a negative voltage is generated at the secondary side to reduce the current required to be cut off and the line inductor initial energy, and the secondary inductor is the line flat-wave inductor; when the fault occurs, the current limiting unit cooperates with the coupling reactor to generate a negative voltage on the line side; the energy absorbing unit is a diode in serial connection with the resistor to suppress the primary side inductor energy to be transmitted to the secondary side of the coupling reactor; the DC circuit breaker unit includes a DC breaker and a lightning arrester, the breaker cut off the fault current, and the arrester absorbs the energy stored by the inductor. The coupling reactor high-voltage direct current fault current limiter provided by the invention achieves the control of the fault current and the energy absorption limit of the lightning arrester, the capacitor parallel connection reduces the capacity and the cost is low.

Description

technical field [0001] The invention belongs to the field of high-voltage direct-current current limiters, and more specifically relates to a high-voltage direct-current current limiter with coupling reactors. Background technique [0002] Due to the shortage of traditional fossil energy, the aggravation of environmental pollution and the continuous growth of users' demand for electric energy, the development of renewable energy and clean energy has developed rapidly. In order to obtain long-distance renewable energy such as wind energy and solar energy more economically, based on the advantages of low loss, long-distance, high-power transmission, more efficient connection of renewable energy to the grid and flexible operation, the advantage of direct current transmission is that it does not increase the system. The short-circuit capacity facilitates the asynchronous network operation of two major power systems and the network connection of power systems with different frequ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a coupling reactor type high-voltage DC current limiter, which aims to solve the problems in the prior art due to the difficulty in breaking large fault currents and the arrester absorption caused by breaking large fault currents. high technical issues

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