Single-phase grounding simulation modeling system of power distribution network

Abstract

The invention discloses a single-phase grounding simulation modeling system of a power distribution network. The single-phase grounding simulation modeling system of a power distribution network is only suitable for carrying out qualitative analysis of the transient characteristics and steady characteristics when a singlephase earth fault occurs in an isolated neutral system and a neutral point grounding system through an arc extinguishing coil. The single-phase grounding simulation modeling system of a power distribution network applies incorporation and simplification on complicated network branches, and can carry out qualitative simulation analysis for a mainstream fault line selection method. Aiming at the factors influencing singlephase earth fault line selection of the power distribution network, such as a line type, a fault position, a grounding resistor and an initial phase angle, the single-phase grounding simulation modeling system of a power distribution network can simulate the current changing characteristics of the grounding fault, the current changing characteristics of different injection signal modes, the current changing characteristics of different injection resistance/reactance and the related electrical quantity characteristics so as to obtain single-phase grounding and the general changing rules of the fault characteristics when the neutral point is ungrounded and the neutral point is grounded through the arc extinguishing coil, and can also perform power distribution network single-phase grounding line selection and positioning method verification. The single-phase grounding simulation model of the power distribution network has high applicability and a wide simulation range.

Description

Technical field [0001] The invention relates to the technical field of power distribution network single-phase grounding fault location simulation technology in the field of power distribution automation, and in particular to a single-phase grounding simulation modeling system for power distribution network. Background technique [0002] my country's medium-voltage power distribution network widely uses neutral point non-effective grounding operation methods, mainly including neutral point non-grounding mode and arc suppression coil grounding mode. The probability of failure in the medium voltage distribution network is very high, especially single-phase grounding faults occur frequently. Statistics show that single-phase grounding faults account for about 80% of the total number of faults in the distribution network. When grounding, the non-faulty relative ground voltage rises, especially when the intermittent arc ground fault occurs, arc overvoltage will be generated, which wil...

AI Technical Summary

Problems solved by technology

These methods systematically reveal the operating characteristics of single-phase ground faults in distribution systems, but they are mostly analyzed in principle, and are not applicable to complex distribution networks.

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