Dynamic simulation system for small current grounding of power distribution network and modeling method of dynamic simulation system

Abstract

The invention provides a dynamic simulation system for small current grounding of a power distribution network and a modeling method of the dynamic simulation system. The system comprises a power simulation unit, a circuit simulation unit, a fault simulation unit, a grounding unit and a controller, wherein an output end of the power simulation unit provides a power signal of the system; the circuit simulation unit is connected with the power simulation unit and used for simulating circuits of the power distribution network; the fault simulation unit is connected with the circuit simulation unit and used for simulating ground faults of the system; the grounding unit is connected with the output end of the power simulation unit; the grounding unit forms a neutral point in the position wherethe grounding unit and the output end of the power simulation unit are connected, the neutral point is connected with different grounding structures through a connection / disconnection device, and theconnection / disconnection device is controlled by the controller to connect or disconnect, so that different grounding manners are constructed. The problem that the neutral point grounding manner of the current dynamic simulation system for the power distribution network is not flexible is solved at least.

Description

technical field [0001] The invention relates to the technical field of simulation of a small current grounding system of a distribution network, in particular to a dynamic simulation system for a small current grounding of a distribution network and a modeling method thereof. Background technique [0002] In recent years, as users have higher and higher requirements for the reliability of distribution network power supply, fault indicators have been widely used in distribution network, and the research on small current ground fault identification and line selection technology has been pushed to a higher level. . When a single-phase ground fault occurs in a small-current grounding system, its zero-sequence current is mainly the ground-to-ground capacitive current of the system, and the magnitude of this current is related to the system scale, and its value may be very small. Therefore, the characteristics of a single-phase ground fault in a small-current grounding system are ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a small current grounding dynamic simulation system of distribution network and its modeling method, at least to solve the problem that the neutral point grounding mode of the current dynamic simulation system of distribution network is not flexible and changeable

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