Grounding fault current compensation system and method for self-produced power supply phase power supply

Abstract

The invention discloses a grounding fault current compensation system and method for a self-produced power supply phase power supply. The system comprises a phase supply power converter, an on-off switch, a voltage regulator and a controller. The input end of the phase power supply converter is connected with a bus, and the output end is connected with the input end of the on-off switch. The common connection point of the on-off switch and the system neutral point are connected on the non-homonymous ends on the two sides of the voltage regulator, and the remaining connection points of the voltage regulator are grounded. The controller is connected with the voltage transformer of the bus. The output end of the controller is connected with the input end of the on-off switch and the voltage regulator. The system can passively generate the power supply phase power supply and the harmonic phase power supply of a distribution network and put the reverse phase power supply and the harmonic phase power supply into the system according to the fault logic so as to realize complete compensation of reactive current, harmonic current and active current of the distribution network grounding fault and solve the problems of poor metal grounding compensation effect of the active inverter method and inability of complete compensation of the traditional arc suppression coil.

Description

technical field [0001] The invention relates to the field of distribution network technology, in particular to a ground fault current compensation system and method for a self-produced power supply phase power supply. Background technique [0002] Single-phase ground faults in distribution networks at home and abroad account for more than 80%, which seriously affects the safe operation of power grids and equipment. Safe handling of ground faults plays an important role in social and economic development. When the capacitive current of the system is greater than 10A, the arc suppressing coil is grounded. The arc suppressing coil can reduce the fault current to a certain extent, and the system can run for 2 hours with a fault, but the arc suppressing coil cannot realize full compensation, and there is still a residual current of less than 10A at the fault point, which can cause personal electric shock and fire accidents , and seriously threaten the safe and stable operation o...

AI Technical Summary

Problems solved by technology

[0009] In view of this, the object of the present invention is to provide a ground fault current compensation system and method for a self-produced power supply phase power supply, through which the line power supply on the bus is changed into a reverse phase power supply through a line-to-phase converter and a voltage regulator, combined with The neutral point of the switching switch connected to the system is connected to the fault phase to suppress the overvoltage of the fault phase to achieve the purpose of full compensation, which effectively solves the complex current control and the difficulty of complete compensation for metallic ground faults in the single-phase ground fault of the power distribution system. At the same time, the voltage regulator in the system, in addition to phase adjustment, also adjusts the voltage amplitude of the line power supply after the phase-changing power supply, so as to achieve the purpose of full compensation of current and voltage in the event of a ground fault

Images