CN115017666B - Intelligent operation method and system for underground water source - Google Patents

Intelligent operation method and system for underground water source Download PDF

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CN115017666B
CN115017666B CN202210941415.3A CN202210941415A CN115017666B CN 115017666 B CN115017666 B CN 115017666B CN 202210941415 A CN202210941415 A CN 202210941415A CN 115017666 B CN115017666 B CN 115017666B
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well pump
well
water
flow
water supply
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CN115017666A (en
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张强
陈海荣
赵明
王松
李伟
孙雪聪
刘艳杰
刘天琪
刘健
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Hebei Construction & Investment Water Investment Co ltd
Tianjin Sambo Water Technology Co ltd
Langfang Qingquan Water Supply Co ltd
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Hebei Construction & Investment Water Investment Co ltd
Tianjin Sambo Water Technology Co ltd
Langfang Qingquan Water Supply Co ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/18—Network design, e.g. design based on topological or interconnect aspects of utility systems, piping, heating ventilation air conditioning [HVAC] or cabling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/14—Pipes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

Abstract

The invention relates to the technical field of water supply systems, and provides an intelligent operation method and system for an underground water source, which comprises the steps of numbering well pumps and pipe network nodes of a water supply network of a water source well, obtaining a flow-lift and flow-efficiency performance curve equation of each well pump based on big data analysis of historical records, and executing multiple hydraulic calculation operations to obtain simulated water supply amount, power consumption and pipe network pressure; for each variable-frequency speed-regulating well pump, when the well pump lift has redundancy, the working point of the well pump is regulated to be close to the high-efficiency point, and the optimization of a single-pump operation scheme is realized; furthermore, the economic optimization of the overall scheduling scheme is carried out by combining the running states of all the well pumps. By the technical scheme, the problems that the operation of the underground water source is dependent on industrial control specified parameters and the big data analysis is lacked in the prior art are solved, the operation of the underground water source system can be changed from automation and informatization to intellectualization, and the economic operation and the safe operation of the underground water source are realized.

Description

Intelligent operation method and system for underground water source
Technical Field
The invention relates to the technical field of water supply systems, in particular to an intelligent operation method and system for an underground water source.
Background
Underground water is an important source of urban water supply, and a water supply unit conveys water in an underground water source to a management station through a well pump and a pipeline and then conveys the underground water to a water consumption unit from the management station. The well pump control is mainly based on remote automatic industrial control, the operation of water source wells, pipe networks and well pump equipment is collected and monitored in real time, the information such as the operation state, the water yield and the like of each well pump is checked for manual scheduling, a large amount of running data of the underground water source and place system are stored in a black box of the system, although automation and partial informatization are realized, massive running information is not utilized, an advanced algorithm tool is not adopted for analyzing big data, and the intelligent degree is low.
Disclosure of Invention
The invention provides an intelligent operation method and system for a ground water source, which solve the problem of low intelligent degree of ground water source operation in the related technology.
The technical scheme of the invention is as follows:
in a first aspect, a method for intelligent operation of a groundwater source comprises:
establishing a water supply pipe network model of a water source well, wherein the water supply pipe network model of the water source well comprises a pipeline and a water source well, the pipeline comprises a main pipeline and branch pipelines, the intersection point of the main pipeline and the branch pipelines is a main node, a well pump is arranged in each water source well, and the well pump is connected with the branch pipelines; the pipeline between any two adjacent nodes is a pipe section, and the nodes are main nodes or well pumps; the well pump comprises a variable frequency well pump and a fixed frequency well pump; based on big data analysis of historical records, establishing a flow-lift performance curve equation and a flow-efficiency performance curve equation of each well pump;
acquiring the total water supply demand of a water supply network of the water source well and the tail end pressure value of the water supply network of the water source well;
selecting an initial well pump combination according to the total water supply requirement of the water supply network of the water source well, wherein the sum of rated flow rates of all well pumps in the initial well pump combination meets the total water supply requirement of the water supply network of the water source well;
executing at least one hydraulic calculation operation on any initial well pump combination until a stop condition is met, and obtaining the target water yield of each well pump with a certain frequency in any initial well pump combination, and the target speed regulation ratio and the target water yield of each well pump with a frequency regulation;
selecting a well pump combination meeting a preset condition as a recommended well pump combination; calculating the unit power consumption of each recommended well pump combination, and selecting the recommended well pump combination with the minimum unit power consumption as the optimal well pump combination; the preset conditions at least include: the flow rate of the recommended well pump combination meets the total water supply requirement of the water supply network of the water source well; the flow rate of any recommended well pump combination is equal to the sum of the target water yield of all the well pumps in the well pump combination;
controlling the well pumps in the optimal well pump combination to work, controlling other well pumps out of the optimal well pump combination to stop working, and controlling each variable frequency well pump to work at an optimal working point, wherein the optimal working point is determined by the target speed regulation ratio;
any one of the hydraulic calculation operations comprises:
sequentially calculating the flow value of each pipe section according to the assumed water yield of each well pump;
calculating the head loss of each pipe section according to the flow value of each pipe section;
sequentially calculating pressure values of all nodes from the tail end of a water supply network of a water source well according to the direction of reverse water flow and the head loss of all pipe sections; the tail end of a water supply pipe network of the water source well is as follows: the end of the water flow direction;
for the variable-frequency well pumps, optimizing the speed regulation ratio of each variable-frequency well pump according to the pressure value of each well pump, and calculating the corrected water yield of each variable-frequency well pump according to the speed regulation ratio; for the fixed-frequency well pumps, calculating to obtain the corrected water yield of each fixed-frequency well pump according to the pressure value of each well pump;
in the first hydraulic calculation operation, the assumed water yield of any well pump is the rated flow of the well pump, and in the other hydraulic calculation operations, the assumed water yield of any well pump is the corrected water yield of the previous time;
the stop condition includes: the difference between the assumed water production and the corrected water production of all well pumps is within a set range;
the corrected water yield of any well pump in the last hydraulic calculation operation is the target water yield of the well pump, and the speed regulation ratio of any variable frequency well pump in the last hydraulic calculation operation is the target speed regulation ratio of the well pump;
when any well pump is a variable-frequency well pump, optimizing the speed regulating ratio of each variable-frequency well pump according to the pressure value of each well pump, and calculating the corrected water yield of each variable-frequency well pump according to the speed regulating ratio; the method specifically comprises the following steps:
determining a high efficiency point (Q) of the well pump based on a flow-efficiency performance curve equation for the well pump0 ,H0 ,η0）；Q0 ,H0,η0Respectively obtaining a high-efficiency point flow value, a high-efficiency point lift value and a high-efficiency point efficiency value;
calculating a lift required value Hx of the well pump according to the pressure value of the well pump;
at Hx< H0And then, according to the law of similarity of the water pump, calculating the corrected water yield of the well pump by using the flow value of the high-efficiency point:
Figure 693078DEST_PATH_IMAGE001
h is not less than Hx0And then, determining the working point of the well pump according to the lift required value Hx, wherein the corrected water yield of the well pump at the working point is as follows:
Figure 662171DEST_PATH_IMAGE002
wherein Q isfFor the corrected water output of the well pump, n is the speed regulating ratio of the well pump, Y, Hj、Ht、HkA, b and c are parameters of the well pump, Y represents unit depth reduction, HjDenotes the hydrostatic level, HtIndicating the corrected value of the depreciation, HkRepresenting a pressure value; and a, b and c are coefficients of a power frequency flow-lift performance curve equation of the well pump.
In a second aspect, a system for intelligently operating a groundwater source includes:
the system comprises a first processing unit, a second processing unit and a control unit, wherein the first processing unit is used for establishing a water supply pipe network model of a water source well, the water supply pipe network model of the water source well comprises a pipeline and the water source well, the pipeline comprises a main pipeline and branch pipelines, the intersection point of the main pipeline and the branch pipelines is a main node, a well pump is arranged in each water source well, and the well pump is connected with the branch pipelines; the pipeline between any two adjacent nodes is a pipe section, and the nodes are main nodes or well pumps; the well pump comprises a variable frequency well pump and a fixed frequency well pump; based on big data analysis of historical records, establishing a flow-lift performance curve equation and a flow-efficiency performance curve equation of each well pump;
the first obtaining unit is used for obtaining the total water supply requirement of a water supply network of the water source well and the pressure value of the tail end of the water supply network of the water source well;
the second processing unit is used for selecting an initial well pump combination according to the total water supply requirement of the water source well water supply network, and the sum of rated flow rates of all well pumps in the initial well pump combination meets the total water supply requirement of the water source well water supply network;
the first execution unit is used for executing at least one hydraulic calculation operation on any initial well pump combination until a stop condition is met, and obtaining the target water yield of each constant-frequency well pump in any initial well pump combination and the target speed regulation ratio and the target water yield of each variable-frequency well pump;
the third processing unit is used for selecting the well pump combination meeting the preset conditions as a recommended well pump combination; calculating the unit power consumption of each recommended well pump combination, and selecting the recommended well pump combination with the minimum unit power consumption as the optimal well pump combination; the preset conditions at least comprise: the flow rate of the recommended well pump combination meets the total water supply requirement of the water supply network of the water source well; the flow rate of any recommended well pump combination is equal to the sum of the target water yield of all the well pumps in the well pump combination;
the first control unit is used for controlling the well pumps in the optimal well pump combination to work, controlling other well pumps except the optimal well pump combination to stop working, and controlling each variable frequency well pump to work at an optimal working point, wherein the optimal working point is determined by the target speed regulation ratio;
any one of the hydraulic calculation operations comprises:
sequentially calculating the flow value of each pipe section according to the assumed water yield of each well pump;
calculating the head loss of each pipe section according to the flow value of each pipe section;
sequentially calculating pressure values of all nodes from the tail end of a water supply network of a water source well according to the direction of reverse water flow and the head loss of all pipe sections; the tail end of a water supply pipe network of the water source well is as follows: the end of the water flow direction;
for the variable-frequency well pumps, optimizing the speed regulation ratio of each variable-frequency well pump according to the pressure value of each well pump, and calculating the corrected water yield of each variable-frequency well pump according to the speed regulation ratio; for the fixed-frequency well pumps, calculating to obtain the corrected water yield of each fixed-frequency well pump according to the pressure value of each well pump;
in the first hydraulic calculation operation, the assumed water yield of any well pump is the rated flow of the well pump, and in the other hydraulic calculation operations, the assumed water yield of any well pump is the corrected water yield of the previous time;
the stop condition includes: the difference between the assumed water production and the corrected water production of all well pumps is within a set range;
the speed regulating ratio of any well pump in the last hydraulic calculation operation is the target speed regulating ratio of the well pump;
when any well pump is a variable frequency well pump, optimizing the speed regulating ratio of each variable frequency well pump according to the pressure value of each well pump, and calculating to obtain the corrected water yield of each variable frequency well pump according to the speed regulating ratio; the method specifically comprises the following steps:
determining a high efficiency point (Q) of the well pump based on a flow-efficiency performance curve equation for the well pump0 ,H0 ,η0）；Q0 ,H0,η0Respectively obtaining a high-efficiency point flow value, a high-efficiency point lift value and a high-efficiency point efficiency value;
calculating a lift required value Hx of the well pump according to the pressure value of the well pump;
at Hx< H0And then, according to the law of similarity of the water pump, calculating the corrected water yield of the well pump by using the flow value of the high-efficiency point:
Figure 613947DEST_PATH_IMAGE001
h is not less than Hx0And then, determining the working point of the well pump according to the lift required value Hx, wherein the corrected water yield of the well pump at the working point is as follows:
Figure 820937DEST_PATH_IMAGE002
wherein Q isfFor the corrected water output of the well pump, n is the speed regulating ratio of the well pump, Y, Hj、Ht、HkA, b and c are parameters of the well pump, Y represents unit depth reduction, HjDenotes the hydrostatic level, HtIndicating the corrected value of the falling depth, HkRepresenting a pressure value; and a, b and c are coefficients of a power frequency flow-lift performance curve equation of the well pump.
In a third aspect, a computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for intelligent operation of a groundwater source.
The working principle and the beneficial effects of the invention are as follows:
according to the method, a water supply network model of a water source well is established, firstly, a well pump combination (initial well pump combination) meeting the total water supply requirement of the water supply network of the water source well is preliminarily selected according to the total water supply requirement of the water supply network of the water source well and the rated flow of each well pump, then, on the basis of the water supply network model of the water source well, multiple hydraulic calculation operations are performed on each well pump combination to obtain the target water output of each well pump in the initial well pump combination, wherein, for the variable frequency well pumps, the optimal speed regulation ratio is obtained through variable frequency control, the target water output of the variable frequency well pumps is controlled to be close to a high-efficiency point, and the work optimization of a single variable frequency well pump is realized; then, according to the total water supply quantity requirement of the water supply network of the water source well and the target water output quantity of each well pump, a well pump combination (recommended well pump combination) meeting the total water supply quantity requirement of the water supply network of the water source well is selected again; and finally, calculating the unit power consumption of each recommended well pump combination, selecting the well pump combination with the minimum unit power consumption as the optimal well pump combination, and controlling the well pump in the optimal well pump combination to work and other well pumps not to work, thereby realizing the overall optimization of the whole underground water source operation and improving the intelligent level of the underground water source operation.
The control process of the variable-frequency well pump specifically comprises the following steps: when the well pump high-efficiency point lift value H is calculated every time the hydraulic power is calculated0When the lift is higher than the required lift value Hx, the well pump lift is shown to have redundancy, the working point of the well pump can be adjusted to be close to the high-efficiency point through frequency conversion control, and specifically, the required lift value Hx and the high-efficiency point lift value H are used0The ratio of the flow rate and the flow rate of the high-efficiency point Q is used for calculating the speed regulating ratio0Calculating the corrected water yield of the well pump by combining the law of similarity of the water pump; otherwise (Hx ≧ H0) Judging that the well pump has insufficient lift, and is not suitable for frequency reduction operation, and calculating the corrected water yield of the well pump according to the power frequency operation condition; after multiple hydraulic calculation operations, the errors of the assumed water yield and the corrected water yield of all the well pumps obtained by the last hydraulic calculation operation are within a set range, and the errors are determined at the momentThe obtained speed ratio is used as a target speed ratio and is used in the actual control of the variable frequency well pump, the variable frequency well pump can be ensured to operate near a high-efficiency point to the maximum extent, the operation efficiency of the variable frequency well pump is improved, and the power consumption is reduced.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a flow chart of the intelligent operation method of a groundwater source according to the present invention;
FIG. 2 is a schematic view of a water supply network model of a water source well according to the present invention;
FIG. 3 is a schematic illustration of the definition of the front and rear ends of a pipe section according to the present invention;
FIG. 4 is a schematic structural diagram of an intelligent operation system of a groundwater source according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive step, are intended to be within the scope of the present invention.
Example one
As shown in fig. 1, a flowchart of an intelligent operation method of a groundwater source according to the embodiment includes:
k100: establishing a water supply pipe network model of a water source well, wherein the water supply pipe network model of the water source well comprises pipelines and the water source well, each pipeline comprises a main pipeline and a branch pipeline, the intersection point of the main pipeline and the branch pipeline is a main node, and each water source well is internally provided with a well pump which is connected with the branch pipeline; a pipeline between any two adjacent nodes is a pipe section, and the nodes are main nodes or well pumps; the well pump comprises a variable frequency well pump and a fixed frequency well pump; establishing a flow-lift performance curve equation and a flow-efficiency performance curve equation of each well pump based on big data analysis of historical records;
the water supply network of the water source well is generally branched, as shown in fig. 2, the water supply network of the water source well comprises a main pipeline and branch pipelines (branches of the branch pipelines are not considered), and parameters of each water source well and each pipeline section are respectively represented by two-dimensional arrays (branches of the branch pipelines are represented by three-dimensional arrays). Firstly, determining a main pipeline and a branch pipeline of a water supply network of the water source well with a determined line, and then numbering each water source well and each pipe section. The numbering sequence is that the counter-current direction is upward, nodes (main nodes) on the main pipeline are firstly numbered, the tail end is 0, the number of a first branch pipeline is 1, the intersection point of the first branch pipeline and the main pipeline is the main node number 1, the number of a second branch pipeline is 2, and the intersection point of the second branch pipeline and the main pipeline is the main node number 2. The well pumps and pipe sections are represented in two-dimensional arrays, for example, the first well pump (first eye) on the first branch pipe is (1,1), and the second well pump is (1,2.); the number of the pipe section between the main node 0 and the main node 1 is (1,0), and the number of the pipe section between the main node 1 and the well pump is (1,1) is (1,1).
K200: and acquiring the total water supply requirement of the water supply network of the water source well and the tail end pressure value of the water supply network of the water source well.
Specifically, the total water supply demand of the water supply well water supply network and the tail end pressure value of the water supply well water supply network are set according to the actual water supply demand and are generally obtained from an external dispatching system.
K300: selecting an initial well pump combination according to the total water supply requirement of the water supply network of the water source well, wherein the sum of rated flow rates of all well pumps in the initial well pump combination meets the total water supply requirement of the water supply network of the water source well;
specifically, the error between the sum of rated flow rates of all the well pumps in the initial well pump combination and the total water supply requirement of the water supply network of the water source well is within a set range.
K400: executing at least one hydraulic calculation operation on any initial well pump combination until a stop condition is met, and obtaining the target water yield of each well pump with a certain frequency in any initial well pump combination, and the target speed regulation ratio and the target water yield of each well pump with a frequency regulation;
any one of the hydraulic calculation operations comprises:
k410: sequentially calculating the flow value of each pipe section according to the assumed water yield of each well pump; the method specifically comprises the following steps:
obtaining the running state and the assumed water yield of each well pump; the above-mentioned operating states include: an on state and an off state;
and for any pipe section, according to the water flow direction, adding the assumed water output of all the well pumps which are positioned in front of the pipe section and are in the opening state to obtain the flow value of the pipe section. In the first hydraulic calculation operation, the assumed water yield of any well pump is the rated flow of the well pump, and in the other hydraulic calculation operations, the assumed water yield of any well pump is the corrected water yield of the well pump obtained in the last hydraulic calculation operation;
taking the water supply network model of the water source well shown in fig. 2 as an example, the flow Q of the pipe section (3,3) is calculated from the well pump (3,3) farthest from the end of the network (main node 0) (3 # in fig. 2)g(3,3) = KT(3,3)×Qf(3,3) where KT (3,3) indicates an on state or off state of well pump (3,3), KT (3,3) =1 when well pump (3,3) is on; KT (3,3) =0 when the well pump (3,3) is off; qf(3,3) is the assumed water production for well pump (3,3).
Flow rate Q of pipe section (3,2)g(3,2)= Qg(3,3) + KT(3,2)×Qf(3,2) where KT (3,2) indicates an on state or off state of well pump (3,2), KT (3,2) =1 when well pump (3,2) is on; KT (3,2) =0 when well pump (3,2) is off; qf(3,2) is the assumed water production for well pump (3,2). And obtaining the value of KT (x, y) according to the currently calculated well pump combination, wherein for any well pump, if the well pump is contained in the currently calculated well pump combination, the KT (x, y) =1 of the well pump, otherwise, the KT (x, y) =0 of the well pump, wherein x represents the number of the branch pipeline, and y represents the y-th well pump on the branch pipeline.
Flow rate Q of pipe section (2,0)g(2,0)= Qg(3,0)+ Qg(2,1)。
By analogy, the flow at the tail end of the water supply pipe network of the water source well is obtained, namely the total water supply demand Q of the water supply pipe network of the water source wellg(1,0)= Qg(2,0)+ Qg(1,1)。
K420: calculating the head loss of each pipe section according to the flow value of each pipe section; the method specifically comprises the following steps:
the pipe sections comprise a main pipe section and branch pipe sections, the pipe sections positioned on the main pipe are the main pipe sections, the serial number is (u, 0), and u represents the u-th main pipe section on the main pipe; the pipe section positioned on the branch pipeline is a branch pipe section and is numbered as (u, v), and u represents the v-th well pump on the u-th branch pipeline; u and v are integers, and v is not equal to 0;
for any pipe section numbered (u, v),
Figure 465545DEST_PATH_IMAGE003
（1）
wherein Hg(u, v) is the head loss of the pipe section, r is the roughness factor of the pipe section, D is the diameter of the pipe section, QgIs the flow value, L, of the pipe sectiongIs the length of the pipe section.
K430: sequentially calculating pressure values of all nodes from the tail end of a water supply network of a water source well according to the direction of reverse water flow and the head loss of all pipe sections; the tail end of the water supply pipe network of the water source well is as follows: the end of the water flow direction;
specifically, for any pipe section, adding the pressure value of the joint connected with the front end of the pipe section to the head loss of the pipe section to obtain the pressure value of the joint connected with the rear end of the pipe section; wherein, the direction from the rear end to the front end is consistent with the water flow direction; in the calculation of the initial node pressure value, the pressure value of the node connected with the front end of the pipe section is the pressure value of the tail end of the water supply pipe network of the water source well. The front and rear ends of the pipe section are defined as shown in fig. 3, in which the direction of the arrows indicates the direction of the water flow.
Still taking the water supply network model of the water source well as shown in fig. 2 as an example, starting from the tail end (main node 0) of the water supply network of the water source well, the pressure value of the main node 0 is a given value Hk0The given value H can be set according to actual needsk0Pressure value H of master node 1k1= Hk0+ Hg(1,0). Wherein Hg(1,0) is calculated according to equation (1).
Pressure value H of master node 2k2= Hk1+ Hg(2,0)，Hg(2,0) is calculated according to equation (1).
Pressure value H of well pump (2,1)k (2,1)= Hk2+ Hg(2,1) wherein Hg(2,1) is calculated according to equation (1).
And by analogy, the pressure value of each well pump is obtained.
K440: for the variable-frequency well pumps, optimizing the speed regulation ratio of each variable-frequency well pump according to the pressure value of each well pump, and calculating the corrected water yield of each variable-frequency well pump according to the speed regulation ratio; for the fixed-frequency well pumps, calculating to obtain the corrected water yield of each fixed-frequency well pump according to the pressure value of each well pump;
in particular, for a variable frequency well pump,
determining a high efficiency point (Q) of the well pump based on a flow-efficiency performance curve equation for the well pump0 ,H0 ,η0）；Q0 ,H0,η0Respectively a high-efficiency point flow value, a high-efficiency point lift value and a high-efficiency point efficiency value;
calculating a lift required value Hx of the well pump according to the pressure value of the well pump;
at Hx< H0In time, the well pump lift is represented as redundancy, the operation working condition point of the well pump is adjusted to be close to the high-efficiency point through frequency conversion, and the similarity law of the water pump is determined
Figure 187513DEST_PATH_IMAGE004
Calculating the speed regulation ratio n of the well pump
Figure 942980DEST_PATH_IMAGE005
Further calculating the corresponding well pump water yield
Figure 738898DEST_PATH_IMAGE006
H is not less than Hx0In time, the well pump head is insufficient, the frequency conversion is carried out without conditions (the frequency conversion can further reduce the efficiency), and the well pump head is operated at the power frequency. Determining the working point of the well pump according to the lift required value Hx, wherein the corrected water yield of the well pump at the working point is as follows:
Figure 554407DEST_PATH_IMAGE007
（2）
wherein Q isfFor the corrected water output of the well pump, n is the speed regulating ratio of the well pump, Y, Hj、Ht、HkA, b and c are parameters of the well pump, Y represents unit depth reduction, HjDenotes the hydrostatic level, HtIndicating the corrected value of the depreciation, HkRepresenting a pressure value; and a, b and c are coefficients of a flow-lift performance curve equation of the well pump.
For a fixed-frequency well pump,
Figure 763671DEST_PATH_IMAGE002
（2）
wherein QfY, H for corrected water production from well pumpsj、Ht、HkA, b and c are parameters of the well pump, Y represents unit depth reduction, HjDenotes the hydrostatic level, HtIndicating the corrected value of the depreciation, HkRepresenting a pressure value; and a, b and c are coefficients of a flow-lift performance curve equation of the well pump.
The stop conditions include: the difference value between the assumed water yield and the corrected water yield is in a set range;
in particular, if it is satisfied
Figure 322829DEST_PATH_IMAGE008
If so, the calculation is stopped assuming that the water yield meets the requirement.
The speed regulating ratio of any well pump in the last hydraulic calculation operation is the target speed regulating ratio of the well pump;
in the first hydraulic calculation operation, the rated flow of any well pump is used as the assumed water yield, and the flow value of each pipe section is calculated in sequence according to the assumed water yield of each well pump; calculating the head loss of each pipe section according to the flow value of each pipe section; sequentially adding the head losses of all the pipe sections from the tail end of a water supply network of the water source well according to the direction of the reverse water flow to obtain the pressure value of each node; and calculating the corrected water output of each well pump according to the pressure value of each node. If the difference value between the assumed water yield and the corrected water yield exceeds the set range, the assumed water yield is not in accordance with the design requirement, the corrected water yield is used as the next assumed water yield, and one hydraulic calculation operation is executed again; and repeating the steps until the difference value between the assumed water yield and the corrected water yield is within the set range, indicating that the assumed water yield meets the requirement of the design precision, taking the assumed water yield as the target water yield, and taking the obtained speed regulation ratio as the target speed regulation ratio.
K500: selecting a well pump combination meeting a preset condition as a recommended well pump combination; calculating the unit power consumption of each recommended well pump combination, and selecting the recommended well pump combination with the minimum unit power consumption as the optimal well pump combination; the preset conditions at least include: the flow rate of the recommended well pump combination meets the total water supply requirement of the water supply network of the water source well; the flow rate of any recommended well pump combination is equal to the sum of the target water yield of all the well pumps in the well pump combination;
specifically, the error between the flow rate of the recommended well pump combination and the total water supply demand of the water supply network of the water source well is within a set range. According to the embodiment, on the premise that the flow of the recommended well pump combination meets the total water supply demand of a water supply network of the water source well, the optimal well pump combination with better economy (minimum unit power consumption) is selected, so that the reduction of the power consumption of water supply of the underground water source ground is facilitated, and the integral optimization of the water supply system of the underground water source ground is realized.
K600: and controlling the well pumps in the optimal well pump combination to work, controlling other well pumps out of the optimal well pump combination to stop working, and controlling each variable frequency well pump to work at an optimal working point, wherein the optimal working point is determined by the target speed regulation ratio.
According to the method, a water supply network model of a water source well is established, firstly, a well pump combination (initial well pump combination) meeting the total water supply requirement of the water supply network of the water source well is preliminarily selected according to the total water supply requirement of the water supply network of the water source well and the rated flow of each well pump, then, on the basis of the water supply network model of the water source well, multiple hydraulic calculation operations are performed on each well pump combination to obtain the target water output of each well pump in the initial well pump combination, wherein, for the variable frequency well pumps, the optimal speed regulation ratio is obtained through variable frequency control, the target water output of the variable frequency well pumps is controlled to be close to a high-efficiency point, and the work optimization of a single variable frequency well pump is realized; then, according to the total water supply quantity requirement of the water supply network of the water source well and the target water output quantity of each well pump, a well pump combination (recommended well pump combination) meeting the total water supply quantity requirement of the water supply network of the water source well is selected again; and finally, calculating the unit power consumption of each recommended well pump combination, selecting the well pump combination with the minimum unit power consumption as the optimal well pump combination, and controlling the well pump in the optimal well pump combination to work and other well pumps not to work so as to realize the integral optimization of the whole underground water source operation.
Wherein, the control process of frequency conversion well pump specifically is: when the well pump high-efficiency point lift value H is calculated every time the hydraulic power is calculated0When the lift is higher than the required lift value Hx, the well pump lift is shown to have redundancy, the working point of the well pump can be adjusted to be close to the high-efficiency point through frequency conversion control, and specifically, the required lift value Hx and the high-efficiency point lift value H are used0The ratio of the flow rate and the flow rate of the high-efficiency point Q is used for calculating the speed regulating ratio0Calculating the corrected water yield of the well pump by combining the similarity law of the water pump; otherwise (Hx ≧ H0) Judging that the well pump has insufficient lift, and is not suitable for frequency reduction operation, and calculating the corrected water yield of the well pump according to the power frequency operation condition; after multiple hydraulic calculation operations, the errors of the assumed water yield and the corrected water yield of all the well pumps obtained by the last hydraulic calculation operation are within a set range, the obtained speed regulation ratio is used as a target speed regulation ratio and is used in the actual control of the variable frequency well pump, the variable frequency well pump can be guaranteed to operate near a high-efficiency point to the maximum extent, the operation efficiency of the variable frequency well pump is improved, and the power consumption is reduced.
Meanwhile, by comparing the operation simulation of the water supply network of the water source well with the actual operation state, the conditions of water leakage of the pipe network, low-efficiency operation of equipment and the like can be found in time, the problem that the operation of the underground water source area in the prior art is lack of big data analysis is solved, the operation of the underground water source area system can be crossed from automation and informatization to intellectualization, and the economic operation and safe operation of the underground water source area are realized by the intellectualized optimization of the system.
Further, the pressure value of any well pump in the last hydraulic calculation operation is the target pressure value of the well pump, and the calculation of the unit power consumption of each recommended well pump combination specifically includes:
calculating the unit power consumption of any well pump according to the target water yield and the target pressure value of the well pump; for any recommended well pump combination, adding the unit power consumption of a plurality of well pumps in the recommended well pump combination to obtain the unit power consumption of the recommended well pump combination;
wherein, calculate the unit power consumption of this well pump, specifically include:
1. calculating the well pumping water level according to the target water yield of the well pump
And the corrected water yield of any well pump in the last hydraulic calculation operation is the target water yield of the well pump, and the pressure value of any well pump in the last hydraulic calculation operation is the target pressure value of the well pump.
The target water yield of any well pump is the well pump flow value of the well pump, the relation between the well pumping water level and the flow approximately conforms to the linear relation, the accurate calculation can adopt the logarithmic or exponential type, the data of the operated water source well is analyzed, the linear type conforms to the well in the common flow section, only the error is slightly generated at the low flow end which is not common, therefore, the embodiment adopts the linear type, and a smaller adjusting value H is addedtThe relationship is as follows:
Figure 238832DEST_PATH_IMAGE009
（3）
wherein HdPumping water level for well, HjIs the hydrostatic level of the well pump, Hd- HjLowering the water level of the well pump;the dynamic water level of each water source well can be monitored in real time, the static water level of each water source well is obtained within a period of time when the water source wells stop operating, and the static water level of each water source well is kept unchanged within a period of time and can be regarded as a constant; qfA well pump flow value; equation (3) can be obtained by fitting historical operating data of the well pump, HtAnd Y are both coefficients. The historical operating data of the well pump comprises a plurality of records, and each record comprises flow, a dynamic water level, a lift and efficiency which correspond to one another.
2. Calculating a well pump lift required value H according to the well pump water level and the target pressure value of the well pumpx
Well pumping water level HdWell pump lift requirement value HxThe following relationship exists between:
Figure 959663DEST_PATH_IMAGE010
（4）
Hkis the target pressure value (wellhead pressure value) of the well pump.
3. According to the required value H of the well pump liftxAnd target water yield Q of well pumpfAnd calculating the unit power consumption of the well pump:
Figure DEST_PATH_IMAGE011
（5）
Figure 452962DEST_PATH_IMAGE012
wherein eta isfFor well pump efficiency, ρ is the specific gravity of water, ρ =1000kg/m3(ii) a g is the acceleration of gravity, g = 9.8N/kg; pfIs well pump power in KW, QfIs the well pump flow value in m3/s，WfThe unit power consumption of the well pump.
And the formula (5) is a power frequency flow-efficiency performance curve equation of the well pump, the historical operation data of the well pump is fitted by a least square method, and d, e and f are coefficients of curves.
It should be noted that, according to the law of similarity of water pumps, the efficiency of the high-efficiency point of a water pump should be the same under different frequencies, but is affected by the efficiencies of the motor and the frequency converter, and the efficiency of the high-efficiency point slightly decreases when the frequency decreases, in this embodiment, a correction factor is added to the flow-efficiency performance curve equation, where α is a coefficient between 0.1 and 0.2.
The derivation process of equation (2) is described below:
1. well pump flow-lift performance curve equation
The flow-lift performance curve equation of the well pump adopts a sample curve provided by a manufacturer, and comprises the following steps:
Figure 550231DEST_PATH_IMAGE013
（6）
wherein HpFor well pump head, QfThe water output of the well pump is the flow value of the well pump, and a, b and c are coefficients of a sample curve. 2. Dynamic water level-flow curve of well pump
The relation between the well pumping water level and the flow rate approximately conforms to a linear relation, the accurate calculation can adopt a logarithmic or exponential type, the data of the operated water source well is analyzed, the well conforms to a good common flow rate section according to the linear type, only a slight error exists at an uncommon low flow rate end, and therefore the well pumping water level and the flow rate adopt the linear type, and a small adjusting value H is addedtThe relationship is as follows:
Figure 383057DEST_PATH_IMAGE009
（3）
wherein HdFor pumping water level of well, HjAs well pump hydrostatic level, Hd- HjLowering the water level of the well pump; the dynamic water level of each water source well can be monitored in real time, and the static water level of each water source well is obtained when the water source wells stop operating for a period of time; qfIs the well pump flow value; equation (4) can be obtained by fitting historical operating data of the well pump, HtAnd Y are both coefficients.
3. According to well pumping water levelHdCalculating the required value H of the well pump liftx：
Figure 274790DEST_PATH_IMAGE010
（4）
Wherein HkThe pressure value of the well pump is the pressure value of the well head.
According to the required value H of the well pump liftxDetermining the working point of the well pump, i.e. order Hp=HxThe flow value Q of the well pump is obtained by combining the above formulas (6), (3) and (4)fAnd (wellhead) pressure value HkThe relation between:
Figure 458647DEST_PATH_IMAGE002
（2）
further, the preset conditions further include:
sorting all well pump combinations with rated flow sum meeting the total water supply requirement of the water supply network of the water source well according to the flow from small to large, and selecting the well pump combination positioned at the front X position as a recommended well pump combination; the above-mentioned satisfaction is specifically: the error between the sum of the rated flow of the well pump combination and the total water supply requirement of the water supply network of the water source well is smaller than a set value.
In this embodiment, in the well pump combination in which the sum of all rated flows meets the scheduling requirement (the total water supply requirement of the water supply well water supply network), the water output and the power consumption are still different, and the closer the sum of the rated flows is to the well pump combination of the total water supply requirement of the water supply well water supply network, the better the economy is, so that on the premise of meeting the total water supply requirement of the water supply well water supply network, the better the economy is, and the energy saving and consumption reduction of the system are facilitated by selecting the scheduling scheme of the better economy. In this embodiment, X =5.
Further, the preset conditions further include: and the target pressure value of each well pump in the recommended well pump combination is smaller than a set value.
The intelligent operation method of the embodiment can not only abandon some uneconomical scheduling schemes, but also prevent some operation schemes which may cause overpressure of the pipe network system, so as to ensure safe operation of the system.
Example two
As shown in fig. 4, a schematic structural diagram of the intelligent operating system of the groundwater source according to the embodiment includes:
the system comprises a first processing unit, a second processing unit and a control unit, wherein the first processing unit is used for establishing a water supply pipe network model of a water source well, the water supply pipe network model of the water source well comprises a pipeline and the water source well, the pipeline comprises a main pipeline and branch pipelines, the intersection point of the main pipeline and the branch pipelines is a main node, a well pump is arranged in each water source well, and the well pump is connected with the branch pipelines; the pipeline between any two adjacent nodes is a pipe section, and the nodes are main nodes or well pumps; the well pump comprises a variable frequency well pump and a fixed frequency well pump; based on big data analysis of historical records, establishing a flow-lift performance curve equation and a flow-efficiency performance curve equation of each well pump;
the first obtaining unit is used for obtaining the total water supply requirement of a water supply network of the water source well and the pressure value of the tail end of the water supply network of the water source well;
the second processing unit is used for selecting an initial well pump combination according to the total water supply requirement of the water source well water supply network, and the sum of rated flow rates of all well pumps in the initial well pump combination meets the total water supply requirement of the water source well water supply network;
the first execution unit is used for executing at least one hydraulic calculation operation on any initial well pump combination until a stop condition is met, and obtaining the target water yield of each constant-frequency well pump in any initial well pump combination and the target speed regulation ratio and the target water yield of each variable-frequency well pump;
the third processing unit is used for selecting the well pump combination meeting the preset conditions as a recommended well pump combination; calculating the unit power consumption of each recommended well pump combination, and selecting the recommended well pump combination with the minimum unit power consumption as an optimal well pump combination; the preset conditions at least include: the flow rate of the recommended well pump combination meets the total water supply requirement of the water supply network of the water source well; the flow rate of any recommended well pump combination is equal to the sum of the target water yield of all the well pumps in the well pump combination;
the first control unit is used for controlling the well pumps in the optimal well pump combination to work, controlling other well pumps except the optimal well pump combination to stop working, and controlling each variable frequency well pump to work at an optimal working point, wherein the optimal working point is determined by the target speed regulation ratio;
any one of the hydraulic calculation operations comprises:
sequentially calculating the flow value of each pipe section according to the assumed water yield of each well pump;
calculating the head loss of each pipe section according to the flow value of each pipe section;
sequentially calculating pressure values of all nodes from the tail end of a water supply network of a water source well according to the direction of reverse water flow and the head loss of all pipe sections; the tail end of a water supply pipe network of the water source well is as follows: the end of the water flow direction;
for the variable-frequency well pumps, optimizing the speed regulation ratio of each variable-frequency well pump according to the pressure value of each well pump, and calculating the corrected water yield of each variable-frequency well pump according to the speed regulation ratio; for the fixed-frequency well pumps, calculating to obtain the corrected water output of each fixed-frequency well pump according to the pressure value of each well pump;
in the first hydraulic calculation operation, the assumed water yield of any well pump is the rated flow of the well pump, and in the other hydraulic calculation operations, the assumed water yield of any well pump is the corrected water yield of the previous time;
the stop condition includes: the difference between the assumed water production and the corrected water production of all well pumps is within a set range;
the speed regulating ratio of any well pump in the last hydraulic calculation operation is the target speed regulating ratio of the well pump;
when any well pump is a variable-frequency well pump, optimizing the speed regulating ratio of each variable-frequency well pump according to the pressure value of each well pump, and calculating the corrected water yield of each variable-frequency well pump according to the speed regulating ratio; the method specifically comprises the following steps:
determining a high efficiency point (Q) of the well pump based on a flow-efficiency performance curve equation for the well pump0 ,H0 ,η0）；Q0 ,H0,η0Respectively is a high-efficiency point flow value, a high-efficiency point lift value and a high-efficiency point effectA value of the rate;
calculating a lift demand Hx of the well pump according to the pressure value of the well pump;
at Hx< H0And then, according to the law of similarity of the water pump, calculating the corrected water yield of the well pump by using the flow value of the high-efficiency point:
Figure 359607DEST_PATH_IMAGE015
h is not less than Hx0And then, determining the working point of the well pump according to the lift required value Hx, wherein the corrected water yield of the well pump at the working point is as follows:
Figure DEST_PATH_IMAGE016
wherein Q isfFor the corrected water output of the well pump, n is the speed regulating ratio of the well pump, Y, Hj、Ht、HkA, b and c are parameters of the well pump, Y represents unit depth reduction, HjDenotes the hydrostatic level, HtIndicating the corrected value of the falling depth, HkRepresenting a pressure value; and a, b and c are coefficients of a power frequency flow-lift performance curve equation of the well pump.
Further, still include:
the second obtaining unit is used for obtaining the running state and the assumed water yield of each well pump; the above-mentioned operating states include: an on state and an off state;
and the second calculation unit is used for adding the assumed water yield of all the well pumps which are positioned in front of the pipe section and are in the opening state to obtain the flow value of the pipe section according to the water flow direction.
The development of the system of the embodiment is based on a field automatic control system, the data of the automatic control system is stored locally, and real-time data is cleaned uniformly by an edge computing gateway and uploaded to a cloud platform; the system is developed by adopting a SaaS version and cloud deployment, and an intelligent operation safety monitoring and optimized scheduling scheme is provided for a field automatic control system.
EXAMPLE III
The embodiment also provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the above-mentioned intelligent operation method for a groundwater source.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The intelligent operation method of the underground water source is characterized by comprising the following steps:
establishing a water supply pipe network model of a water source well, wherein the water supply pipe network model of the water source well comprises a pipeline and a water source well, the pipeline comprises a main pipeline and branch pipelines, the intersection point of the main pipeline and the branch pipelines is a main node, a well pump is arranged in each water source well, and the well pump is connected with the branch pipelines; the pipeline between any two adjacent nodes is a pipe section, and the nodes are main nodes or well pumps; the well pump comprises a variable frequency well pump and a fixed frequency well pump; based on big data analysis of historical records, establishing a flow-lift performance curve equation and a flow-efficiency performance curve equation of each well pump;
acquiring the total water supply demand of a water supply network of the water source well and the tail end pressure value of the water supply network of the water source well;
selecting an initial well pump combination according to the total water supply requirement of the water supply network of the water source well, wherein the sum of rated flow rates of all well pumps in the initial well pump combination meets the total water supply requirement of the water supply network of the water source well;
executing at least one hydraulic calculation operation on any initial well pump combination until a stop condition is met, and obtaining the target water yield of each well pump with a certain frequency in any initial well pump combination, and the target speed regulation ratio and the target water yield of each well pump with a frequency regulation;
selecting a well pump combination meeting a preset condition as a recommended well pump combination; calculating the unit power consumption of each recommended well pump combination, and selecting the recommended well pump combination with the minimum unit power consumption as the optimal well pump combination; the preset conditions at least include: the flow rate of the recommended well pump combination meets the total water supply requirement of the water supply network of the water source well; the flow rate of any recommended well pump combination is equal to the sum of the target water yield of all the well pumps in the well pump combination;
controlling the well pumps in the optimal well pump combination to work, controlling other well pumps out of the optimal well pump combination to stop working, and controlling each variable frequency well pump to work at an optimal working point, wherein the optimal working point is determined by the target speed regulation ratio;
any one of the hydraulic calculation operations comprises:
sequentially calculating the flow value of each pipe section according to the assumed water yield of each well pump;
calculating the head loss of each pipe section according to the flow value of each pipe section;
sequentially calculating pressure values of all nodes from the tail end of a water supply network of a water source well according to the direction of reverse water flow and the head loss of all pipe sections; the tail end of a water supply pipe network of the water source well is as follows: the end of the water flow direction;
for the variable-frequency well pumps, optimizing the speed regulation ratio of each variable-frequency well pump according to the pressure value of each well pump, and calculating the corrected water yield of each variable-frequency well pump according to the speed regulation ratio; for the fixed-frequency well pumps, calculating to obtain the corrected water yield of each fixed-frequency well pump according to the pressure value of each well pump;
in the first hydraulic calculation operation, the assumed water yield of any well pump is the rated flow of the well pump, and in the other hydraulic calculation operations, the assumed water yield of any well pump is the corrected water yield of the previous time;
the stop condition includes: the difference between the assumed water production and the corrected water production of all well pumps is within a set range;
the corrected water yield of any well pump in the last hydraulic calculation operation is the target water yield of the well pump, and the speed regulation ratio of any variable frequency well pump in the last hydraulic calculation operation is the target speed regulation ratio of the well pump;
when any well pump is a variable-frequency well pump, optimizing the speed regulating ratio of each variable-frequency well pump according to the pressure value of each well pump, and calculating the corrected water yield of each variable-frequency well pump according to the speed regulating ratio; the method specifically comprises the following steps:
determining a high efficiency point (Q) of the well pump according to a flow-efficiency performance curve equation of the well pump0 ,H0 ,η0）；Q0 ,H0 ,η0Respectively obtaining a high-efficiency point flow value, a high-efficiency point lift value and a high-efficiency point efficiency value;
calculating a lift required value Hx of the well pump according to the pressure value of the well pump;
at Hx< H0And then, according to the law of similarity of the water pump, calculating the corrected water yield of the well pump by using the flow value of the high-efficiency point:
Figure 4861DEST_PATH_IMAGE001
h is not less than Hx0And then, determining the working point of the well pump according to the lift required value Hx, wherein the corrected water yield of the well pump at the working point is as follows:
Figure 461381DEST_PATH_IMAGE002
wherein Q isfFor the corrected water output of the well pump, n is the speed regulating ratio of the well pump, Y, Hj、Ht、HkA, b and c are parameters of the well pump, Y represents unit depth reduction, HjDenotes the hydrostatic level, HtIndicating the corrected value of the depreciation, HkRepresenting a pressure value; and a, b and c are coefficients of a power frequency flow-lift performance curve equation of the well pump.
2. An intelligent operation method of a ground water source according to claim 1, wherein for the fixed-frequency well pumps, the corrected water output of each fixed-frequency well pump is calculated according to the pressure value of each well pump; the method specifically comprises the following steps:
Figure 655602DEST_PATH_IMAGE003
wherein Q isfY, H for corrected water production from well pumpsj、Ht、HkA, b and c are parameters of the well pump, Y represents unit depth reduction, HjDenotes the hydrostatic level, HtIndicating the corrected value of the depreciation, HkRepresenting a pressure value; and a, b and c are coefficients of a power frequency flow-lift performance curve equation of the well pump.
3. An intelligent operation method for a ground water source according to claim 1, wherein the pressure value of any well pump in the last hydraulic calculation operation is the target pressure value of the well pump, and the calculating of the unit power consumption of each recommended well pump combination specifically comprises:
calculating the unit power consumption of any well pump according to the target water yield and the target pressure value of the well pump; for any recommended well pump combination, adding the unit power consumption of a plurality of well pumps in the recommended well pump combination to obtain the unit power consumption of the recommended well pump combination;
wherein, according to the target water yield and the target pressure value of any well pump, calculate the unit power consumption of this well pump, specifically include:
calculating the well pumping water level according to the target water yield of the well pump:
Figure 430529DEST_PATH_IMAGE004
wherein HdFor pumping water level of well, HjIs the hydrostatic level of the well pump, Hd- HjLowering the water level of the well pump; qfIs the target water output of the well pump; htAnd Y are coefficients, Y represents the unit depth of fall, HtIndicating a depreciation correction value;
calculating a well pump lift required value H according to the well pump water level and the target pressure value of the well pumpx：
Figure 978185DEST_PATH_IMAGE005
Wherein HkIs a target pressure value for the well pump;
according to the required value H of the well pump liftxAnd target water yield Q of well pumpfAnd calculating the unit power consumption of the well pump:
Figure 335217DEST_PATH_IMAGE006
Figure 654334DEST_PATH_IMAGE007
wherein eta isfFor well pump efficiency, ρ is the specific gravity of water, ρ =1000kg/m3(ii) a g is the acceleration of gravity, g = 9.8N/kg; pfIs well pump power in KW, WfD, e and f are coefficients of a power frequency flow-efficiency performance curve equation of the well pump, and alpha is a coefficient between 0.1 and 0.2.
4. A groundwater source intelligent operation method according to claim 1, wherein the calculating flow values of the pipe sections in sequence according to the assumed water output of each well pump specifically comprises:
obtaining the running state and the assumed water yield of each well pump; the operating states include: an on state and an off state;
and for any pipe section, according to the water flow direction, adding the assumed water yield of all the well pumps which are positioned in front of the pipe section and are in the opening state to obtain the flow value of the pipe section.
5. An intelligent operation method of a ground water source according to claim 1, wherein the calculating of the head loss of each pipe section according to the flow value of each pipe section specifically comprises:
for any one of the pipe sections,
Figure 73814DEST_PATH_IMAGE008
wherein HgFor head loss of the pipe section, r is the roughness coefficient of the pipe section, D is the diameter of the pipe section, QgIs the flow value of the pipe section, LgIs the length of the pipe section.
6. An intelligent operation method of a ground water source according to claim 1, wherein the step of sequentially calculating the pressure values of the nodes according to the head loss of each pipe section from the tail end of a water supply pipe network of a water source well and according to the direction of the reverse water flow comprises the following steps:
adding the pressure value of the joint connected with the front end of any pipe section and the head loss of the pipe section to obtain the pressure value of the joint connected with the rear end of the pipe section; wherein, the direction from the rear end to the front end is consistent with the water flow direction; in the first calculation of the node pressure value, the pressure value of the node connected with the front end of the pipe section is the pressure value of the tail end of the water supply pipe network of the water source well.
7. An intelligent operation method of a ground water source according to claim 1, wherein the preset conditions further comprise:
sorting all candidate well pump combinations according to the flow from small to large, and selecting the candidate well pump combination positioned at the front X position as a recommended well pump combination; the sum of the target water output of all the well pumps in the candidate well pump combination meets the total water supply requirement of the water supply network of the water source well; x is a positive integer.
8. Intelligent operating system in groundwater source ground, its characterized in that includes:
the system comprises a first processing unit, a second processing unit and a control unit, wherein the first processing unit is used for establishing a water supply pipe network model of a water source well, the water supply pipe network model of the water source well comprises a pipeline and the water source well, the pipeline comprises a main pipeline and branch pipelines, the intersection point of the main pipeline and the branch pipelines is a main node, a well pump is arranged in each water source well, and the well pump is connected with the branch pipelines; the pipeline between any two adjacent nodes is a pipe section, and the nodes are main nodes or well pumps; the well pump comprises a variable frequency well pump and a fixed frequency well pump; based on big data analysis of historical records, establishing a flow-lift performance curve equation and a flow-efficiency performance curve equation of each well pump;
the first obtaining unit is used for obtaining the total water supply requirement of a water supply network of the water source well and the pressure value of the tail end of the water supply network of the water source well;
the second processing unit is used for selecting an initial well pump combination according to the total water supply requirement of the water source well water supply network, and the sum of rated flow rates of all well pumps in the initial well pump combination meets the total water supply requirement of the water source well water supply network;
the first execution unit is used for executing at least one hydraulic calculation operation on any initial well pump combination until a stop condition is met, and obtaining the target water yield of each constant-frequency well pump in any initial well pump combination and the target speed regulation ratio and the target water yield of each variable-frequency well pump;
the third processing unit is used for selecting the well pump combination meeting the preset conditions as a recommended well pump combination; calculating the unit power consumption of each recommended well pump combination, and selecting the recommended well pump combination with the minimum unit power consumption as the optimal well pump combination; the preset conditions at least comprise: the flow rate of the recommended well pump combination meets the total water supply requirement of the water supply network of the water source well; the flow rate of any recommended well pump combination is equal to the sum of the target water yield of all the well pumps in the well pump combination;
the first control unit is used for controlling the well pumps in the optimal well pump combination to work, controlling other well pumps except the optimal well pump combination to stop working, and controlling each variable frequency well pump to work at an optimal working point, wherein the optimal working point is determined by the target speed regulation ratio;
any one of the hydraulic calculation operations comprises:
sequentially calculating the flow value of each pipe section according to the assumed water yield of each well pump;
calculating the head loss of each pipe section according to the flow value of each pipe section;
sequentially calculating pressure values of all nodes from the tail end of a water supply network of a water source well according to the direction of reverse water flow and the head loss of all pipe sections; the tail end of a water supply pipe network of the water source well is as follows: the end of the water flow direction;
for the variable-frequency well pumps, optimizing the speed regulation ratio of each variable-frequency well pump according to the pressure value of each well pump, and calculating the corrected water yield of each variable-frequency well pump according to the speed regulation ratio; for the fixed-frequency well pumps, calculating to obtain the corrected water yield of each fixed-frequency well pump according to the pressure value of each well pump;
in the first hydraulic calculation operation, the assumed water yield of any well pump is the rated flow of the well pump, and in the other hydraulic calculation operations, the assumed water yield of any well pump is the corrected water yield of the previous time;
the stop condition includes: the difference between the assumed water production and the corrected water production of all well pumps is within a set range;
the speed regulating ratio of any well pump in the last hydraulic calculation operation is the target speed regulating ratio of the well pump;
when any well pump is a variable frequency well pump, optimizing the speed regulating ratio of each variable frequency well pump according to the pressure value of each well pump, and calculating to obtain the corrected water yield of each variable frequency well pump according to the speed regulating ratio; the method specifically comprises the following steps:
determining a high efficiency point (Q) of the well pump based on a flow-efficiency performance curve equation for the well pump0 ,H0 ,η0）；Q0 ,H0 ,η0Respectively obtaining a high-efficiency point flow value, a high-efficiency point lift value and a high-efficiency point efficiency value;
calculating a lift required value Hx of the well pump according to the pressure value of the well pump;
at Hx< H0And then, according to the similarity law of the water pump, calculating the corrected water yield of the well pump by using the flow value of the high-efficiency point:
Figure 815374DEST_PATH_IMAGE009
at Hx ≧ H0During the process, the working point of the well pump is determined according to the lift demand Hx, and the well pump is in the working positionThe corrected water yield of the point making is as follows:
Figure 636699DEST_PATH_IMAGE002
wherein Q isfFor the corrected water output of the well pump, n is the speed regulating ratio of the well pump, Y, Hj、Ht、HkA, b and c are parameters of the well pump, Y represents unit depth reduction, HjDenotes the hydrostatic level, HtIndicating the corrected value of the depreciation, HkRepresenting a pressure value; and a, b and c are coefficients of a power frequency flow-lift performance curve equation of the well pump.
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