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

Abstract

The invention discloses a ground fault current compensation system and method for a self-produced phase power supply, The ground fault current compensation system includes a phase power supply generator, a phase power supply phase compensator, a switch, a controller, and a voltage regulator. The input end of the phase power supply generator is connected to a bus. The output end of the phase powersupply generator is connected to the input end of the phase power supply phase compensator. The voltage regulator is connected in series between the phase power supply phase compensator and the neutral point of the system. The controller is connected to the voltage transformer of the bus. The output end of the controller is connected to the switch. The system passively generates the phase power supply, and puts the inverted power supply phase and the harmonic phase power supply into the system according to the fault logic. The ground fault current compensation system achieves the complete compensation of the reactive current, the harmonic current and the active current of the ground fault of a distribution network, and solves the problems that the power electronic device inversion injection method cannot achieve full compensation and is complex to control after taking power from the system.

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

It effectively solves the problems of complicated current control and difficult to fully compensate for metallic grounding in the single-phase grounding fault of the power distribution system. In order to achieve the purpose of full compensation of current and voltage, no arc occurs after the full compensation of the present invention, which avoids the risk of personal electric shock and improves the reliability and safety of power supply

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