A controllable current source ground current fully compensated output current calculation method and system

Abstract

This application discloses a controllable current source grounding fault current full compensation method and system, including detecting the three-phase voltage and the neutral point voltage of the system when the system is in normal operation; the controllable current source outputting the detection current; obtaining the output of the controllable current source Detect the system neutral point voltage corresponding to the current; calculate the current value that the controllable current source should output when the ground current is fully compensated after a single-phase ground fault occurs. In this application, by connecting the current source, after detecting the three-phase voltage and neutral point current of the system, the controllable current source outputs the detection current, and obtains the system neutral point voltage corresponding to the output detection current of the controllable current source , and then calculate the corresponding output current when the controllable current source performs full compensation of single-phase ground current. Thus, the output current value of the access system is guaranteed to be more accurate, the fault phase can be effectively compensated and the arc extinguishing purpose can be achieved, thereby ensuring the safe and stable operation of the power grid, and avoiding fires and personal electric shock accidents caused by fault points.

Description

technical field [0001] The present application relates to the technical field of full compensation for single-phase grounding of power grid systems, and in particular to a calculation method and system for output current of full compensation for grounding of a controllable current source. Background technique [0002] In the power grid system, especially in the medium and low voltage distribution network system, single-phase ground faults account for the vast majority of the total number of faults. When the system capacitive current exceeds a certain value, the grounding arc cannot be extinguished by itself when a single-phase grounding fault occurs, resulting in arc overvoltage and other secondary hazards. my country's low-voltage distribution network generally adopts small current grounding methods, including the neutral point ungrounded method or the neutral point grounded method through the arc suppression coil. When the neutral point is not grounded, the grounding arc ...

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Problems solved by technology

[0003] This application provides a controllable current source grounding full compensation output current calculation method and system to solve the problem in the prior art that the neutral point is connected to the current source for compensation, but the current value connected to the system cannot be guaranteed, causing arc extinguishing It has caused difficulties, the safe and stable operation of the power grid cannot be guaranteed, and there are still problems of fires and personal electric shock accidents caused by fault points

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