Probability evaluation method for fault tolerance online fault positioning of complex active power distribution network

Abstract

The invention provides a probability evaluation method for fault tolerance online fault positioning of a complex active power distribution network. The probability evaluation method comprises the following steps of: performing partition decoupling on the complex active power distribution network; quantizing a feeder line fault probability; establishing causal equipment of automatic switching equipment; establishing a feeder line fault probability accumulation characteristic calculation function of the independent region and the coupling region by taking a feeder line fault probability as an endogenous variable; establishing a simple active power distribution network feeder line fault probability accumulation characteristic calculation function under the action of multiple power supply sources; collecting current alarm information to establish a probability approximation switch function set; establishing a probability evaluation optimization model of power distribution network feeder line fault positioning in a continuous space based on an absolute value equivalent transformation theory; and transmitting a switching-off command to an adjacent automatic switch of a possible faulty feeder line section by means of the control master station according to the feeder line fault probability. The probability evaluation method meets convex optimization properties, can directly adopt an interior point method for decision solving, is extremely high in numerical stability, and is more suitable for online fault positioning of the large-scale complex active power distribution network.

Description

technical field [0001] The invention relates to the technical field of intelligent distribution networks, in particular to a probability evaluation method for fault-tolerant online fault location of complex active distribution networks. Background technique [0002] Distribution network fault section location technology is an indispensable power automation technology for distribution network automation and intelligent distribution network operation and control. and one of the key technologies for reliability. [0003] Distribution network fault location technology has always been a hot spot in the field of electric power research. After decades of research, it has achieved fruitful results. It has developed from the earliest fault manual line inspection mode to one that relies on the fusion of data acquisition information and computer processing technology. Intelligent distribution network fault location technology. Intelligent fault location technology mainly includes dis...

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Problems solved by technology

[0006] Aiming at the technical problems that the existing distribution network fault location method is prone to misjudgment and misjudgment, and lacks strong adaptability to the problem of complex active distribution network feeder fault location, the present invention proposes a complex active distribution network fault-tolerant online fault location Based on FTU and other automated terminal equipment, the probability evaluation method can effectively quantify and quantify the failure probability of a single feeder section or multiple feeder sections under the scene of whether there is alarm information distortion in the feeder fault section of the active distribution network containing T-shaped coupling nodes. The isolation of feeder faults can effectively realize the online fault location of large-scale and complex active distribution networks

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