Arc suppression coil device and method for compensating for active component in single-phase grounding fault current

Abstract

The invention discloses an arc suppression coil device and method for compensating for an active component in single-phase grounding fault current. The device comprises a Z-type grounding transformer module with a secondary winding, a single-phase arc suppression coil module, a low-voltage reactor module controlled by a thyristor, a single-phase full-bridge inverter module, a three-phase PWM rectifier module and a controller module. The method includes the steps that the active component in the grounding current is compensated for by the arc suppression coil in the mode that a three-phase PWM rectifier is combined with a single-phase full-bridge inverter, when a single-phase grounding fault happens in a power distribution network, the single-phase full-bridge inverter module is controlled to compensate for the active component in the grounding current with the formula (please see the formula in the specification) as instruction current, an appropriate PWM control strategy is adopted for generating driving signals to adjust and control corresponding electric and electronic devices so that the electric and electronic devices can be controlled to output compensation current same to the active component current in magnitude and opposite to the active component current in phase, the active component in the grounding current is optimally compensated for, reliable and stable operation of the arc suppression coil is guaranteed, and the operation safety of the power distribution network is improved.

Description

technical field [0001] The invention relates to an arc suppression coil device and method, in particular to an arc suppression coil device and method for compensating active components in single-phase ground fault current. Background technique [0002] With the continuous expansion of the distribution network of cities and industrial and mining enterprises, the magnitude of the active component in the single-phase ground fault current of the distribution network has also increased significantly. The usual arc suppressing coil can only generate inductive current to realize the compensation of the power frequency reactive component in the single-phase ground fault current, but it cannot correct the zero sequence circuit due to the active power loss of the distribution network itself and the arc suppressing coil connected to the system. The active component of the single-phase ground fault current formed by other factors is compensated. If no compensation measures are taken, w...

AI Technical Summary

Problems solved by technology

[0003] Technical problem: The object of the present invention is to provide an arc suppressing coil device and method for compensating the active component in the single-phase ground fault current, so as to solve the problem of active component compensation in the single-phase ground fault current

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