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

Abstract

The invention discloses a grounding fault current compensation system and method for a self-generated power supply phase power supply. The grounding fault current compensation system comprises a phasepower supply converter, a fling-cut switch, a voltage transformation device and a controller, wherein the input end of the phase power supply converter is connected with a bus, the output end of thephase power supply converter is connected with the input end of the fling-cut switch, the voltage transformation device is connected between the phase power supply converter and a system neutral pointin series, the controller is connected with a voltage transformer of the bus, and the output end of the controller is connected with the input end of the fling-cut switch. The system can passively generate a power distribution network power supply phase power supply and a harmonic phase power supply, and the reversed-phase power supply phase power supply and the harmonic phase power supply are put into the system according to fault logic, so that complete compensation of reactive current and harmonic current of the grounding fault of the power distribution network is achieved, the defect thatthe compensation is incomplete by adopting a power electronic device inversion injection method after electricity is taken from a bus system is overcome, and the problems that an active inversion method is poor in metallic grounding compensation effect and a traditional arc suppression coil cannot achieve full compensation are solved.

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 purpose of the present invention is to provide a ground fault current compensation system and method for 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-phase converter, combined with switching switches to connect The neutral point of the input 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 problems of complex current control and difficulty in fully compensating for metallic grounding in the single-phase ground fault of the power distribution system. At the same time, the system There is also a transformer device, which adjusts the voltage of the line power supply after changing the phase of the power supply, so as to achieve the purpose of full compensation of current and voltage in the event of a ground fault. After the invention is fully compensated, no arc occurs, which avoids the risk of personal electric shock and improves the power supply. Reliability and Security of Power Supply

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