Method for selecting neutral point grounding mode of medium voltage distribution network

Abstract

The invention discloses a method for selecting a neutral point grounding mode of a medium voltage distribution network. According to the method, according to the difference of the influences of different neutral point grounding modes on the medium voltage distribution network, the reliability of the power distribution network under the different neutral point grounding modes is evaluated and compared through quantitative calculation of the line fault trip probability of the power distribution network, reliability evaluation and operating cost analysis of the power distribution network under the different neutral point grounding modes are combined, so that the optimal neutral point grounding mode of the power distribution network is selected by the way of calculating the whole life cycle cost of the power distribution network under the different neutral point grounding modes and reliability factors in a combined mode, the design and transformation engineering requirement of the medium voltage distribution network can be met, and the security and the operating maintenance efficiency of the power distribution network are improved. By the adoption of the method, the high reliability neutral point grounding mode with optimal economy can be decided on the basis that the influence of the different neutral point grounding modes on the reliability and the construction operating cost of the medium voltage distribution network is calculated.

Description

technical field [0001] The invention relates to a medium-voltage distribution network, in particular to determining an ideal neutral-point grounding method through evaluation among several neutral-point grounding methods of the medium-voltage distribution network, and belongs to the field of power system planning and design. Background technique [0002] The neutral point grounding of the power system refers to the electrical connection between the neutral point of the generator and transformer windings and the grounding device. The neutral point grounding methods of medium voltage distribution network mainly include non-grounding, grounding through arc suppressing coil and grounding through resistance. The system with ungrounded neutral point is a kind of non-effectively grounded system with neutral point, which can actually be regarded as a system grounded by capacitive reactance. The capacitance is composed of the ground coupling capacitance of all electrical equipment s...

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Problems solved by technology

[0005] Aiming at the lack of quantitative evaluation tools for the neutral point grounding mode of the existing medium-voltage distribution network and the difficulty of comprehensive decision-making, the present invention

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