PDD-based urban water supply pipe network pipe explosion early warning and positioning method

Abstract

The invention discloses a PDD-based urban water supply pipe network pipe explosion early warning and positioning method. The method comprises the following steps that firstly, a normal daily water supply database of each DMA partition of a water supply pipe network is determined by using a seven-day average shift difference method, and a ci value is calculated by using a PDD model and the water supply database; then the pressure drop difference of each DMA partition in the daytime, at night and all days is calculated according to a normal daily pressure value in the database, and the normal range of the pressure drop under each of the three conditions is determined based on the corresponding pressure drop difference; when the pressure drop difference exceeds the normal range, a risk earlywarning is send out, and high risk, medium risk and risk are correspondingly determined according to the exceeding times; and the DMA partition where pipe explosion occurs is determined according to the risk early warning, the background leakage loss is distributed by using ci, the newly added pipe explosion amount are sequentially overlaid to each node, and the most possible pipe explosion node is obtained by taking a least square error between an analog value and an actual value of a pressure monitoring point as an evaluation standard. According to the method, high-precision rapid early warning and positioning of pipe explosion can be realized, and the harm of pipe explosion to a water supply pipe network system is reduced.

Description

technical field [0001] The invention belongs to the field of urban water supply pipe networks, and relates to pipe burst early warning positioning of water supply pipe networks, in particular to an idea of ​​pipe burst early warning positioning of urban water supply pipe networks based on a PDD model and a calculation method for leakage coefficients in the positioning model. Background technique [0002] Explosive pipe leakage is common in the water supply network. If it is not discovered in time, it will lead to abnormal operation of the water supply system, affect the life of residents and the production of enterprises, waste water resources, and damage the economic benefits of enterprises. However, the pipe burst warning and location technology is relatively complicated, and how to detect the burst pipe in time and quickly find the burst pipe point is one of the difficulties. The methods of pipe burst location in the current research are mainly based on the analysis of the...

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Problems solved by technology

Although the PDD-based leakage location model establishes a pressure-driven formula to consider the change of the water volume of the pipe network node with the pressure when the pipe burst occurs, the leakage coefficient in the calculation formula of the background leakage amount in this model is randomly generated during the model operation process. It does not conform to the actual situation of the pipe network, and the method of checking and positioning based on the model can only locate the leakage point and cannot give early warning of the burst pipe in time

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