CN110848578A - PDD model-based existing leakage positioning method for urban water supply pipe network - Google Patents
PDD model-based existing leakage positioning method for urban water supply pipe network Download PDFInfo
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- CN110848578A CN110848578A CN201810951519.6A CN201810951519A CN110848578A CN 110848578 A CN110848578 A CN 110848578A CN 201810951519 A CN201810951519 A CN 201810951519A CN 110848578 A CN110848578 A CN 110848578A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
Abstract
An existing leakage positioning method for an urban water supply pipe network based on a PDD model. According to the method, firstly, the production and marketing difference of the pipe network needs to be analyzed, the actual production and marketing difference of the pipe network is compared with the expected production and marketing difference, and if the actual production and marketing difference exceeds the expected production and marketing difference, the existing leakage positioning is carried out on the pipe network. When the existing leakage positioning is carried out, the pipe network is subjected to hydraulic calculation according to the expected production and sales difference to obtain the pipe network condition under the expected production and sales difference. And taking the difference between the actual water supply quantity of the pipe network and the expected yield-sales difference water supply quantity as the superposed water quantity, superposing the superposed water quantity to the nodes of the expected yield-sales difference pipe network, and performing hydraulic calculation again to obtain the pressure value of each node. And finally, solving the minimum value of the target function by taking the square sum of the difference between the pressure value of the pressure monitoring point calculated by the superposed water amount and the pressure value of the actual monitoring point as an evaluation standard to obtain the existing leakage point. The invention can realize the quick positioning of the existing leakage, reduce the leakage detection time and solve the problem of the leakage storage of the pipe network.
Description
Technical Field
The invention belongs to the field of urban water supply pipe networks, relates to existing leakage positioning of a water supply pipe network, and particularly relates to an existing leakage positioning method of an urban water supply pipe network based on a PDD (product data distribution) model.
Background
The yield and sales difference is an important index for measuring the economic benefit of water supply enterprises, and is also the comprehensive reflection of the management service level of the water supply enterprises. The poor yield and sales are caused by various factors, and from the view of a water balance system of the international water coordination, the poor yield and sales can be divided into physical leakage of a pipe network, free water, recording errors, metering errors, water stealing and the like, wherein the leakage water is a main component of the poor yield and sales, and the reduction of the leakage water is a key for controlling the poor yield and sales. Leakage detection and repair are the most important mode for controlling the leakage of a pipe network, the first step is to adopt effective leakage detection measures to find out the specific position where the leakage occurs, and the leakage can be repaired and stopped in the next step. The research and development of leak detection technology, and the improvement of leak detection efficiency are one of the important directions in the field of leak control research, and the current common leak detection methods include a passive leak detection method and an active leak detection method. Passive leakage detection can only find a few leakage points seeping out of the ground, and the control effect on the total leakage water quantity of the pipe network is not high. The active leak detection method is to adopt various equipment instruments to analyze and detect the leakage condition of the underground pipe section, and compared with passive leak detection, the leakage condition which can not be detected by naked eyes can be detected, but the investment of the equipment is relatively high. In recent years, with the installation and improvement of SCADA systems on water supply networks, many scholars at home and abroad are beginning to focus on research and development of leakage detection and positioning of water supply networks mainly based on software. The method is characterized in that whether leakage occurs in a pipe network is judged and the position and the amount of leakage occurring are determined according to the change of pressure or flow values acquired by an SCADA system. The technology can improve the sensitivity and effectiveness of the leakage detection, can enable a water supply company to quickly respond after a leakage accident occurs, and has good application prospect.
Disclosure of Invention
In view of the above, the invention provides a PDD model-based existing leakage positioning method for an urban water supply network, aiming at the requirement of the water supply network on existing leakage positioning.
In order to achieve the purpose, the invention adopts the following steps:
step 1, carrying out production and marketing differential analysis to judge whether existing leakage positioning is needed
Calculating the actual production and sales difference of the existing pipe network according to the water supply and sales data of the water supply pipe network, comparing the actual production and sales difference with the expected production and sales difference, and if the actual production and sales difference exceeds the expected production and sales difference, performing existing leakage positioning; if not, positioning is not needed;
step 2, reducing the pipe network under the expected production and marketing difference
The existing leakage positioning model is used for performing hydraulic calculation on the pipe network exceeding the expected yield and sales difference according to the expected yield and sales difference to obtain the pipe network condition under the expected yield and sales difference, namely:
Qqexpected yield difference x S
Qq is the total flow of water inflow of the DMA subareas under the expected production and sales difference; s is the actual water sale amount of the DMA subarea; distributing the flow along the line according to the actual water consumption condition of the pipe network by taking Qq as the total water inflow flow, and calculating the water volume and the water pressure of each node of the pipe network when the Qq is the total water inflow flow by controlling the water pressure of the least favorable point to obtain the water volume and water pressure condition of the reduction pipe network;
step 3, calculating and positioning the superposed water volume
And (3) subtracting the total water supply under the expected yield and sales difference calculated in the step (3) from the total water supply of the existing pipe network as a superposed water quantity QLNamely:
QLactual pipe network water supply-Qq
Step 4, positioning is carried out
Taking the flow and pressure of each node of the reduction pipe network as initial values of the existing leakage positioning calculation, and adding the water quantity QLSuperpose the node of reducing pipe network and carry out hydraulic calculation again, in order to make each node flow of pipe network after the stack and pressure can actually reflect current pipe network condition, reduce model calculation error, when carrying out the calculation of the water yield that adds, adopt the pressure drive hydraulic model that more laminates reality to calculate, promptly:
qi-leak＝ciQi reqH1.18
in the formula:
qi-leak-background leakage amount (L/s) for node i;
Qi req-node nominal flow (L/s) of node i;
ci-loss factor.
In the formula:
Qi use-water consumption (L/s) by the user of node i;
QL-the burst volume (L/s) of the burst node;
h-actual water pressure (m) at node i;
Hmax-nominal water pressure (m) of node i;
Hmin-critical water pressure (m) of node i.
When the node has no additional pipe explosion, QLIs 0. Calculate QLThe pressure values of all the nodes are superposed at different nodes;
and finally, taking the square sum of the difference between the pressure value of the pressure monitoring point calculated by overlapping the water amount and the pressure value of the actual monitoring point as an evaluation standard by the objective function, namely:
wherein n is the total number of the pressure monitoring points.
The invention has the beneficial effects that: the invention can realize the positioning of the existing leakage exceeding the expected yield and sales difference, reduce the leakage detection time, reduce the leakage stock of the pipe network, and reduce the waste of water resources and the loss of water supply enterprises.
Drawings
FIG. 1 is a small DMA pipe network in G
FIG. 2 is a diagram of the positioning result of the existing leakage
FIG. 3 is a flow chart of an existing leakage location embodiment
Detailed Description
In order that the technology of the present invention may be readily understood, a more particular description of embodiments of the present invention will be rendered by reference to the appended drawings, which are illustrated in the appended drawings. In the example, a small DMA pipe network in G city is taken as a research object, and as shown in FIG. 1, the pipe network comprises 16 common water nodes, 18 pipes, 1 pressure monitoring point, 1 water inlet, and measurements of pressure and flow. The DMA pipe network is known to have the average water sale amount of 8408m3 in month and 4 months, the water supply amount of 27254m3 and the total water inlet head of 32.34mH2O, loss coefficient 0.0272.
Step 1, carrying out production and marketing differential analysis to judge whether existing leakage positioning is needed
The actual production and sales difference of the existing pipe network is calculated to be 69% according to the water supply and sales data of the water supply pipe network, and if the expected production and sales difference is 20%, the production and sales difference of the small DMA pipe network is far beyond the expected production and sales difference, and the existing leakage needs to be positioned.
Step 2, reducing the pipe network under the expected production and marketing difference
Determining the small DMA pipe network according to the step 1 to perform leakage positioning, obtaining the expected water supply amount of 3.65L/s according to the expected yield-sales difference of 20% and the water sale amount of 4 months in the step 1, and calculating the water inlet pressure of the pipe network under the expected yield-sales difference to be 33.82mH by using the minimum water pressure as a constraint condition through flow distribution2And O, flow and pressure of each node of the pipe network before and after reduction are shown in a graph 1.
TABLE 1
Step 3, calculating and positioning the superposed water volume
The actual water supply of this small DMA pipe network was 10.51L/s. When the expected sales difference is 20 percent and the expected water supply amount is 3.65L/s, the superposed water amount Q is positionedLAt 6.86L/s, the location known data is shown in Table 2.
TABLE 2
| Quantity of water sold per month (L/s) | 3.04 |
| Expected difference between production and sales | 20％ |
| Expected yield and sales difference water supply (L/s) | 3.65 |
| Reducing pipe network water inlet pressure (mH)2O) | 33.82 |
| Positioning superimposed water volume (L/s) | 6.86 |
| Loss coefficient of leakage | 0.0272 |
| Monitoring point pressure (mH)2O) | 26.087 |
Step 4, positioning is carried out
And (3) taking the node flow in the reduction pipe network in the step (2) as an initial total group, introducing the node flow into a traditional hydraulic model, solving through EPANET to obtain the pressure value of each node, and calculating the actual water consumption of each node by using a pressure driving model.
The superposed water quantity QLAnd sequentially and circularly adding the pressure monitoring points to each node, and using the minimum sum of squares of the difference between the calculated value and the measured value of the pressure monitoring point as an objective function to carry out optimization. The optimization result is shown in table 3, when the superimposed water amount is superimposed on the node with the node ID of 365, the objective function is minimum, the superimposed water amount is considered to be most consistent with the actual condition when the superimposed water amount is at the node, the objective function value is 0.1411, the square sum of the difference between the calculated value and the actual value is small, the surface actual leakage point is very close to the actual value, the positioning accuracy is high, the result shows that the actual leakage point is actually near the node with the node ID of 365 by detecting leakage as shown in fig. 2.
TABLE 3
| Water volume superposition node ID | Value of objective function |
| 354 | 0.8495 |
| 355 | 0.7806 |
| 356 | 2.6209 |
| 357 | 0.4042 |
| 358 | 0.3526 |
| 359 | 7.591 |
| 360 | 4.0616 |
| 361 | 0.1734 |
| 362 | 23.7746 |
| 363 | 3.3236 |
| 364 | 0.4083 |
| 365 | 0.1411 |
| 366 | 0.3268 |
| 367 | 0.1632 |
| 368 | 0.3822 |
| 369 | 0.978 |
Claims (1)
1. A PDD model-based existing leakage positioning method for an urban water supply pipe network is characterized by comprising the following steps:
step 1, carrying out production and marketing differential analysis to judge whether existing leakage positioning is needed
Calculating the actual production and sales difference of the existing pipe network according to the water supply and sales data of the water supply pipe network, comparing the actual production and sales difference with the expected production and sales difference, and if the actual production and sales difference exceeds the expected production and sales difference, performing existing leakage positioning; if not, positioning is not needed;
step 2, reducing the pipe network under the expected production and marketing difference
The existing leakage positioning model is used for performing hydraulic calculation on the pipe network exceeding the expected yield and sales difference according to the expected yield and sales difference to obtain the pipe network condition under the expected yield and sales difference, namely:
Qqexpected yield difference x S
Qq is the total flow of water inflow of the DMA subareas under the expected production and sales difference; s is the actual water sale amount of the DMA subarea; distributing the flow along the line according to the actual water consumption condition of the pipe network by taking Qq as the total water inflow flow, and calculating the water quantity and the water pressure of each node of the pipe network when the Qq is the total water inflow flow by controlling the water pressure of the least favorable point to obtain the water quantity and water pressure condition of the reduction pipe network;
step 3, calculating and positioning the superposed water volume
And (3) subtracting the total water supply under the expected yield and sales difference calculated in the step (3) from the total water supply of the existing pipe network as a superposed water quantity QLNamely:
QLactual pipe network water supply-Qq
Step 4, positioning is carried out
Taking the flow and pressure of each node of the reduction pipe network as initial values of the existing leakage positioning calculation, and adding the water quantity QLSuperpose the node of reducing pipe network and carry out hydraulic calculation again, in order to make each node flow of pipe network after the stack and pressure can actually reflect current pipe network condition, reduce model calculation error, when carrying out the calculation of the water yield that adds, adopt the pressure drive hydraulic model that more laminates reality to calculate, promptly:
qi-leak＝ciQi reqH1.18
in the formula:
qi-leak-background leakage amount (L/s) for node i;
Qi req-node nominal flow (L/s) of node i;
ci-loss factor.
In the formula:
Qi use-water consumption (L/s) by the user of node i;
QL-the burst volume (L/s) of the burst node;
h-actual water pressure (m) at node i;
Hmax-nominal water pressure (m) of node i;
Hmin-critical water pressure (m) of node i.
When the node has no additional pipe explosion, QLIs 0. Calculate QLThe pressure values of all the nodes are superposed at different nodes;
finally, the pressure value P of the pressure monitoring point calculated by the objective function according to the superposed water quantityqiPressure with actual monitoring pointValue PiThe sum of the squares of the differences was used as an evaluation criterion, namely:
wherein n is the total number of the pressure monitoring points.
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Cited By (3)
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| CN114135794A (en) * | 2021-11-22 | 2022-03-04 | 杭州数梦工场科技有限公司 | Method and device for detecting leakage of water network |
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