Direct-current power grid fault current controller

Abstract

The invention discloses a direct-current power grid fault current controller which comprises a primary circuit and a controller body. The primary circuit comprises an inductor, a filter capacitor, a resistor, an IGBT switch, a diode, a contactor and a current Hall sensor. The inductor, the first resistor and the second contactor are connected in series to form a series circuit; the series circuitis connected in parallel with the first contactor; the second resistor and the first diode are connected in series to form a first branch; the third resistor and the second diode are connected in series to form a second branch; the first branch circuit and the second branch circuit are connected with the inductor in parallel; the filter capacitor and the IGBT switch are connected in parallel withthe first resistor; the current Hall sensor is arranged on the series circuit; and the controller controls different on-off combinations of the IGBT switch and the two contactors in the primary circuit, so that the primary circuit forms different working modes. According to the invention, direct-current power grid fault protection can be realized, and power failure of the whole direct-current power distribution network caused by blocking of a direct-current power grid main power supply due to a temporary feeder fault is avoided.

Description

technical field [0001] The invention relates to a fault current controller of a DC power grid, in particular to a controller for protecting a DC power supply from blocking immediately when a feeder fault occurs in a low-voltage distribution network, and belongs to the technical field of new topology and control of a low-voltage DC distribution network. Background technique [0002] When a DC load in the DC distribution network fails, and the load feeder switch has not been separated from the DC power supply, the fault current will be detected and blocked immediately (us level), resulting in a power outage of the entire DC distribution network, and other loads will also be forced to power outage. Contents of the invention [0003] The main purpose of the present invention is to overcome the deficiencies in the prior art and provide a DC power grid fault current controller, which can realize DC power grid fault protection and avoid temporary feeder failures that will not caus...

AI Technical Summary

Problems solved by technology

[0002] When a DC load in the DC distribution network fails, and the load feeder switch has not been separated, the DC power supply will detect the fault current and block it immediately (us level), resulting in a power outage of the entire DC distribution network, and other loads will also be forced to power outage

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