Pump station system operation regulation and control method, system and equipment based on full overcurrent system and medium

Abstract

The invention relates to the field of water conservancy system optimization, in particular to a pump station system operation regulation and control method, system, equipment and medium based on a full overflowing system, and the method comprises the following steps: step 1, establishing a three-dimensional geometric model of the full overflowing system of a pump station; step 2, carrying out grid division; step 3, carrying out numerical simulation by adopting a # imgabs0 # turbulence model; under the condition that the total water diversion amount of the pump station is determined, obtaining an optimal flow distribution scheme when different unit combinations operate; and 4, obtaining an optimal start-up combination scheme by comparing the optimal start-up scheme of the pump station system with the optimal flow distribution scheme during combined operation of different units, and obtaining an optimal start-up combination scheme by comparing the optimal start-up combination scheme with the optimal flow distribution scheme. The method aims at reducing the operation cost of the pump station and improving the operation efficiency of the pump station, the internal flow characteristics of the water pump are analyzed through a numerical simulation method, the optimal starting-up combination scheme is obtained, and the flow distribution of the pump station is optimized on the premise that the total water diversion amount of the pump station is fixed based on the external characteristic curve of the water pump.

Description

Technical Field

[0001] The present invention relates to the field of water conservancy system optimization, and in particular to a pump station system operation control method, system, equipment and medium based on a full-flow system. Background Art

[0002] The development of pump station projects in scale, quantity and technology has led to an increase in the amount of electrical energy required for their operation. To ensure the safe, stable, economical and long-term operation of the pump station, in addition to the good hydraulic performance of the pump unit, the water inlet device must provide good water inlet conditions for the pump device as much as possible and the water outlet device must be able to recover energy to the maximum extent.

[0003] However, previous studies mainly focused on the system composed of the "water inlet channel + pump device" or water delivery device of the unit section, while there were fewer studies on the full flow system "water inlet device + pump device + water outlet device". The hydraulic relationship among the water inlet device, pump device and water outlet device is complex, and most studies use simplified boundary conditions, ignoring the influence of the free liquid surface on the hydraulic performance of the pump unit.

[0004] In addition, in the actual operation of the pump station, the operating conditions of each unit will be constantly adjusted as the natural water volume and downstream conditions change; different startup combinations and sequences under the same operating conditions of the pump station have an important impact on the performance of the water pump unit, the operating status and stability of the pump station system, so this requires the operation and management personnel of the pump station to make adjustments at any time according to the actual situation to ensure that the pump station maximizes its benefits while minimizing energy consumption {Yu Fangbin, 2002 #9}. Summary of the invention

[0005] In view of the problem in the prior art that the pump station system has a large operating energy consumption due to the impact on the hydraulic performance of the pump unit due to incomplete research, the present invention provides a pump station system operation control method, system, equipment and medium based on a full flow system.

[0006] The present invention is achieved through the following technical solutions: A method for controlling the operation of a pump station system based on a full flow system comprises the following steps: Step 1, establishing a three-dimensional geometric model of the full flow system of the pump station, the full flow system including an inlet pool, an inlet flow channel, a centrifugal pump, a fixed guide vane, a volute, an outlet flow channel and an outlet pool connected to the outlet flow channel; Step 2, meshing the calculation area of ​​the three-dimensional model of the pump station, dividing the calculation area into multiple flow components, including an inlet pool, an inlet flow channel, an impeller, a fixed guide vane, a volute, an outlet flow channel, and an outlet pool; Step 3: Set the boundary condition to ignore the free liquid surface and use The turbulence model numerically simulates the flow characteristics of the water inlet pool and the pump under the condition of multi-pump combination, and obtains the optimal startup plan of the pump station system; When the total water diversion of the pumping station is determined, combined with the external characteristic curve of the water pump unit, a function model is established with the goal of minimizing the total input power of the pumping station. Under the constraints of flow and head, the optimal flow distribution scheme when different unit combinations are running is obtained through conventional numerical solutions and MATLAB genetic algorithm toolbox optimization solutions. Step 4, the optimal startup combination plan is obtained by comparing the optimal startup plan of the pump station system with the optimal flow distribution plan when different unit combinations are operated.

[0007] Preferably, in step 2, a hexahedral structured grid is used to divide the calculation area of ​​the three-dimensional model of the pump station.

[0008] Preferably, the mass of the hexahedral structured grid is greater than or equal to 0.2, and the angle is greater than or equal to 18°.

[0009] Preferably, in step 3, numerical simulation is performed using the axial flow velocity uniformity of the water pump inlet section, the average deviation angle, and the hydraulic loss from the water inlet pool to the water inlet channel outlet as evaluation indicators.

[0010] Preferably, in step 3, the boundary conditions are as follows: the calculation domain of the runner flow field is set to rotating (Rotating), the speed is given, the other calculation domains are set to stationary (Stationary), the dynamic and static interfaces (i.e., between the inlet flow channel and the runner and between the runner and the fixed guide vane) are connected by a rotating interface, which is set to "Forzen Rotor", and the interfaces of the other components are connected by interfaces to complete the transfer of flow parameters in different calculation domains; the wall boundaries are all set to no slip and no friction; the convergence condition standard selects the average RMS, and the residual 1.0×10 -4 As the convergence basis of iterative calculation.

[0011] Preferably, in step 3, the specific process of numerical simulation is: First, numerical simulation is performed under single pump operation conditions to obtain the flow field distribution in the water inlet channel, the vorticity of the water inlet channel, and the vortex structure of the impeller channel under the single pump redesign conditions. The optimal single pump operation unit is obtained through comparison. Then, numerical simulation of multi-pump combination operation is carried out, and numerical simulation of two units running in parallel, three units running in parallel, and four units running in parallel under the design conditions is carried out to obtain the axial flow velocity uniformity of each combination section. , average drift angle And the hydraulic loss from the inlet pool to the outlet of the inlet channel.

[0012] Preferably, in step 3, the uniformity of the cross-sectional axial velocity is The closer the value is to 1, the higher the average drift angle The closer the value is to 0° and the smaller the hydraulic loss from the inlet pool to the inlet channel outlet, the optimal combination scheme of the optimal unit can be evaluated.

[0013] A pump station system operation control system based on a full flow system includes a three-dimensional model building module, a grid division module, a numerical simulation module, a data processing module and a data analysis module. The three-dimensional model building module is used to build a three-dimensional geometric model of the full flow system of the pump station; the grid division module is used to grid the calculation area of ​​the three-dimensional model of the pump station; the numerical simulation module is used to adopt The turbulence model numerically simulates the flow in the water inlet pool and the pump under the condition of multi-pump combination to obtain the optimal startup plan of the pump station system; the data processing and optimization module is used to establish a function model with the goal of minimizing the total input power of the pump station in combination with the external characteristic curve of the water pump unit when the total water diversion volume of the pump station is determined, and the optimal flow distribution plan is obtained through conventional numerical solutions and MATLAB genetic algorithm toolbox under the constraints of flow and head; the data analysis module is used to compare the optimal startup plan of the pump station system with the optimal flow distribution plan when different unit combinations are operated to obtain the optimal startup combination plan.

[0014] An electronic device includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the pump station system operation control method based on the full flow system are implemented.

[0015] A storage medium stores a computer program, which, when executed by a processor, implements the steps of the pump station system operation control method based on a full-flow system.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The pump station system operation control method based on the full flow system of the present invention improves the pump station operation efficiency and reduces the pump station operation cost by numerically simulating the water pump full flow system "water inlet device + pump device + water outlet device". Specifically, a three-dimensional geometric model of the pump station is first built, and then the computational grid is divided. According to the control equation, The turbulence model and boundary conditions were used to numerically simulate the situations of starting different numbers of units at the same time. The axial velocity uniformity of the pump inlet section, the average deviation angle and the hydraulic loss from the inlet pool to the inlet channel outlet were used as evaluation indicators to preliminarily determine the optimal startup combination plan to ensure the best unit performance.

[0017] The pump station has multiple pump units running in parallel. Except for the standby units, the total water diversion of the pump station is determined by the sum of the working flow of each operating unit. Under a certain water diversion, in order to minimize the input power of the entire pump station, there will be a problem of how to distribute the flow among the operating units to minimize the input power. Therefore, based on the preliminary determined optimal startup combination scheme of the pump station, combined with the characteristic curve of the pump unit, with the goal of minimizing the input power of the pump station, under the condition of satisfying the head and flow constraints, a mathematical model of pump station flow distribution was established, and the flow distribution of different numbers of units was optimized using conventional numerical solutions (i.e., permutations and combinations) and genetic algorithms; then, the optimal control scheme of the pump station system under the premise of a certain total water diversion was determined through the optimal combination of the units in the station, so that the pump station can achieve the purpose of economic operation and create economic and social benefits to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of the pump station system operation control method based on the full flow system of the present invention; Figure 2 It is the result of flow distribution obtained based on MATLAB genetic algorithm toolbox when there are six units in the embodiment; Figure 3 It is the result of flow distribution obtained based on MATLAB genetic algorithm toolbox when there are five units in the embodiment; Figure 4 It is the result of flow distribution obtained based on MATLAB genetic algorithm toolbox when there are four units in the embodiment; Figure 5 This is the flow distribution result obtained based on the MATLAB genetic algorithm toolbox for three units in the embodiment. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0020] The present invention discloses a pump station system operation control method based on a full flow system, referring to Figure 1 , including the following steps: Step 1, establishing a three-dimensional geometric model of the full flow system of the pump station, the full flow system including an inlet pool, an inlet flow channel, a centrifugal pump, a fixed guide vane, a volute, an outlet flow channel and an outlet pool connected to the outlet flow channel; Step 2, select a hexahedral structured grid to mesh the calculation area of ​​the three-dimensional model of the pump station, and divide the calculation area into multiple flow components, including an inlet pool, an inlet channel, an impeller, a fixed guide vane, a volute, an outlet channel and an outlet pool; wherein the mass of the hexahedral structured grid is greater than or equal to 0.2, and the angle is greater than or equal to 18°.

[0021] Step 3: Based on CFX, for the pump unit operating under the design conditions, the axial velocity uniformity, average deviation angle, and hydraulic loss from the inlet pool to the outlet of the inlet channel are used as evaluation indicators to analyze the optimal combination of multiple pumps. The boundary conditions are set to ignore the free liquid surface and the optimal combination is adopted. The turbulence model uses the axial flow velocity uniformity, average deviation angle and hydraulic loss from the inlet pool to the inlet channel outlet of the water pump inlet section as evaluation indicators to numerically simulate the flow characteristics in the inlet pool and the pump under multi-pump combination conditions, and obtains the optimal startup plan for the pump station system.

[0022] The boundary conditions are as follows: the calculation domain of the runner flow field is set to rotating (Rotating), the speed is given, the other calculation domains are set to stationary (Stationary), the dynamic and static interfaces (i.e., the inlet flow channel and the runner and the runner and the fixed guide vane) are connected by a rotating interface, which is set to "Forzen Rotor", and the interfaces of the other components are connected by interfaces to complete the transfer of flow parameters in different calculation domains; the wall boundaries are set to no slip and no friction; the convergence condition standard selects the average RMS, and the residual is taken as 1.0×10 -4 As the convergence basis of iterative calculation.

[0023] The specific process of numerical simulation is as follows: First, numerical simulation is performed under single pump operation conditions to obtain the flow field distribution in the water inlet channel, the vorticity of the water inlet channel, and the vortex structure of the impeller channel under the single pump redesign conditions. The optimal single pump operation unit is obtained through comparison. Then, numerical simulation of multi-pump combination operation is carried out, and numerical simulation of two units running in parallel, three units running in parallel, and four units running in parallel under the design conditions is carried out to obtain the axial flow velocity uniformity of each combination section. , average drift angle And the hydraulic loss from the inlet pool to the outlet of the inlet channel. And the uniformity of the axial velocity of the cross section The closer the value is to 1, the average drift angle The closer the value is to 0° and the smaller the hydraulic loss from the inlet pool to the inlet channel outlet, the optimal combination scheme of the optimal unit can be evaluated.

[0024] When the total water diversion of the pumping station is determined, combined with the external characteristic curve of the water pump unit, a function model is established with the goal of minimizing the total input power of the pumping station. Under the constraints of flow and head, the optimal flow distribution scheme when different unit combinations are running is obtained through conventional numerical solutions and MATLAB genetic algorithm toolbox optimization solutions. Among them, the expression of the function model established with the goal of minimizing the total input power of the pumping station is:

[0025] Where: P Indicates the total input power of the pumping station, MW; n Indicates the number of powered-on units; P i Indicates i Input power of operating units, MW.

[0026] The constraint function expression of the constraint condition is:

[0027]

[0028] In the formula, Q Indicates the total water diversion capacity of the pumping station, m 3 / s; Q i Indicates i Working flow of the operating unit, m 3 / s; H min , H max Respectively represent the minimum and maximum head of the pump unit in operation, m; Hi represents the working head of the i-th operating unit, m.

[0029] Through conventional numerical solution (i.e., permutation and combination solution) and MATLAB genetic algorithm toolbox optimization solution, the optimal flow distribution schemes for three units operating in parallel, four units operating in parallel, five units operating in parallel, and six units operating in parallel under the condition of a certain water diversion volume are obtained.

[0030] Step 4, the optimal startup combination plan is obtained by comparing the optimal startup plan of the pump station system with the optimal flow distribution plan when different unit combinations are operated.

[0031] A pump station system operation control scheme design method of the present invention aims to reduce the operation cost of the pump station and improve the operation efficiency of the pump station. The flow characteristics in the water pump are analyzed by numerical simulation to obtain the best startup combination scheme. Further, based on the external characteristic curve of the water pump, the flow distribution of the pump station is optimized under the premise of a certain total water diversion volume of the pump station.

[0032] Taking a pump station as an example, there are 7 vertical single-stage, single-suction centrifugal pumps. The working flow range of a single pump is 11.38 m 3 / s—13.63 m 3 / s, the working flow and input power of the water pump unit are shown in Table 1.

[0033] Table 1 Working flow of water pump unit

[0034] Table 2 Traffic distribution results

[0035] Assuming the total water diversion capacity of the pumping station is 70 m 3 / s, 60 m 3 / s, 50 m 3 / s and 40 m 3 / sThese four cases take the input power minimum as the objective function, and the total water diversion of the pump station and the working head of the pump unit as the constraint conditions to determine the number of units required to be started in the station and the optimal distribution of flow under the premise of a certain water diversion of the pump station. Table 2 shows the flow distribution results obtained using conventional numerical solutions (i.e., permutations and combinations). Figure 2-5 It is the result of flow distribution obtained based on MATLAB genetic algorithm toolbox.

[0036] In the optimization results based on the MATLAB genetic algorithm toolbox, the blue dots represent the distribution of average fitness values, and the red dots represent the distribution of optimal fitness values. It can be found that as the number of iterations increases, the results gradually approach the optimal solution. 3 / s, the minimum input power is 43.6561 MW; the total water diversion capacity is 50 m 3 / s, the minimum input power is 57.0771 MW; the total water diversion capacity is 60 m 3 / s, the minimum input power is 70.5458 MW; the total water diversion volume is 70 m 3 / s, the minimum input power is 84.0097 MW. Compared with the results of the conventional numerical solution, it can be seen that the minimum values ​​of the input power of the two are similar and the best individual values ​​are the same. The main reason for the difference is that the number of effective digits retained is different.

[0037] The final pump station system control plan is determined based on the optimal startup combination plan and the optimal flow distribution plan. Specifically, according to the optimal startup combination plan, for example, when the total water diversion required by the pump station is 50 m 3 / s, four units must be turned on, and the uniformity of the starting combination of No. 1, No. 3, No. 4, and No. 5 is determined according to step 3 The closer the value is to 1, the higher the average drift angle The closer the value is to 0°, the smaller the hydraulic loss is from the inlet pool to the outlet of the inlet channel. According to step 4, the optimal flow distribution result is determined: 11.5 m for two units 3 / s, and the remaining two are 13.5 m3 / s, then the optimal startup plan is to start units 1, 3, 4, and 5, two of which have a flow rate of 11.5 m 3 / s, and the remaining two are 13.5 m 3 / s, so that each operating unit can give full play to its greatest advantage, maximize the benefits of the pumping station under the premise of minimum energy consumption, and achieve the optimization of the pumping station benefits.

[0038] The present invention also discloses a pump station system operation control system based on a full flow system, including a three-dimensional model building module, a grid division module, a numerical simulation module, a data processing module and a data analysis module. The three-dimensional model building module is used to build a three-dimensional geometric model of the full flow system of the pump station; the grid division module is used to grid the calculation area of ​​the three-dimensional model of the pump station; the numerical simulation module is used to adopt The turbulence model numerically simulates the flow in the water inlet pool and the pump under the condition of multi-pump combination to obtain the optimal startup plan of the pump station system; the data processing and optimization module is used to establish a function model with the goal of minimizing the total input power of the pump station in combination with the external characteristic curve of the water pump unit when the total water diversion volume of the pump station is determined, and the optimal flow distribution plan is obtained through conventional numerical solutions and MATLAB genetic algorithm toolbox under the constraints of flow and head; the data analysis module is used to compare the optimal startup plan of the pump station system with the optimal flow distribution plan when different unit combinations are operated to obtain the optimal startup combination plan.

[0039] The present invention also discloses an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the pump station system operation control method based on the full flow system are implemented.

[0040] The present invention also discloses a storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the pump station system operation control method based on the full-flow system are implemented.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to impose any limitation on the technical solution of the present invention. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can also be subjected to several simple modifications and substitutions, and these modifications and substitutions are also within the scope of protection covered by the claims.

Claims

1. A method for controlling the operation of a pump station system based on a full flow system, characterized in that: The following steps are involved: Step 1, establishing a three-dimensional geometric model of the full flow system of the pump station, the full flow system including an inlet pool, an inlet flow channel, a centrifugal pump, a fixed guide vane, a volute, an outlet flow channel and an outlet pool connected to the outlet flow channel; Step 2, meshing the calculation area of ​​the three-dimensional model of the pump station, dividing the calculation area into multiple flow components, including an inlet pool, an inlet flow channel, an impeller, a fixed guide vane, a volute, an outlet flow channel, and an outlet pool; Step 3: Set the boundary condition to ignore the free liquid surface and use The turbulence model numerically simulates the flow characteristics of the water inlet pool and the pump under the condition of multi-pump combination, and obtains the optimal startup plan of the pump station system; When the total water diversion of the pumping station is determined, combined with the external characteristic curve of the water pump unit, a function model is established with the goal of minimizing the total input power of the pumping station. Under the constraints of flow and head, the optimal flow distribution scheme when different unit combinations are running is obtained through conventional numerical solutions and MATLAB genetic algorithm toolbox optimization solutions. Step 4, the optimal startup combination plan is obtained by comparing the optimal startup plan of the pump station system with the optimal flow distribution plan when different unit combinations are operated.

2. The pump station system operation control method based on the full flow system according to claim 1 is characterized in that: In step 2, a hexahedral structured grid is used to divide the calculation area of ​​the three-dimensional model of the pump station.

3. The pump station system operation control method based on the full flow system according to claim 2 is characterized in that: The quality of the hexahedral structured grid is greater than or equal to 0.2, and the angle is greater than or equal to 18°.

4. The pump station system operation control method based on the full flow system according to claim 1 is characterized in that: In step 3, numerical simulation is performed using the axial velocity uniformity of the pump inlet section, the average deviation angle, and the hydraulic loss from the inlet pool to the inlet channel outlet as evaluation indicators.

5. The pump station system operation control method based on the full flow system according to claim 4 is characterized in that: In step 3, the boundary conditions are as follows: the calculation domain of the rotor flow field is set to rotating, with a given rotation speed, the rest of the calculation domains are set to static domains, the dynamic and static interfaces are connected by rotating interfaces, set to "Forzen Rotor", and the interfaces of the other components are connected by interfaces to complete the transfer of flow parameters in different calculation domains; the wall boundaries are set to no slip and no friction; the convergence condition standard is the average RMS, and the residual is 1.0×10 -4 As the convergence basis of iterative calculation.

6. The pump station system operation control method based on the full flow system according to claim 5 is characterized in that: In step 3, the specific process of numerical simulation is: First, numerical simulation is performed under single pump operation conditions to obtain the flow field distribution in the water inlet channel, the vorticity of the water inlet channel, and the vortex structure of the impeller channel under the single pump redesign conditions. The optimal single pump operation unit is obtained through comparison. Then, numerical simulation of multi-pump combination operation is carried out, and numerical simulation of two units in parallel operation, three units in parallel operation, and four units in parallel operation are carried out under the design conditions to obtain the axial flow velocity uniformity of each combination section. , average drift angle And the hydraulic loss from the inlet pool to the outlet of the inlet channel.

7. The pump station system operation control method based on the full flow system according to claim 4 is characterized in that: In step 3, the uniformity of the axial velocity of the cross section The closer the value is to 1, the average drift angle The closer the value is to 0° and the smaller the hydraulic loss from the inlet pool to the inlet channel outlet, the optimal combination scheme of the optimal unit can be evaluated.

8. A pump station system operation control system based on a full flow system, characterized in that: It includes a 3D model building module, a meshing module, a numerical simulation module, a data processing module and a data analysis module. The 3D model building module is used to build a 3D geometric model of the full flow system of the pump station; the meshing module is used to mesh the calculation area of ​​the 3D model of the pump station; the numerical simulation module is used to adopt The turbulence model numerically simulates the flow in the water inlet pool and the pump under the condition of multi-pump combination to obtain the optimal startup plan of the pump station system; the data processing and optimization module is used to establish a function model with the goal of minimizing the total input power of the pump station in combination with the external characteristic curve of the water pump unit when the total water diversion volume of the pump station is determined, and the optimal flow distribution plan is obtained through conventional numerical solutions and MATLAB genetic algorithm toolbox under the constraints of flow and head; the data analysis module is used to compare the optimal startup plan of the pump station system with the optimal flow distribution plan when different unit combinations are operated to obtain the optimal startup combination plan.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the pump station system operation control method based on the full-flow system described in any one of claims 1 to 7 are implemented.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the pump station system operation control method based on a full-flow system described in any one of claims 1 to 7 are implemented.

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