A step-pump station front pool water level control method and system based on inter-stage feedback

Abstract

The application provides a step-pump-station front-pool water level control method and system based on inter-stage feedback. The method comprises the following steps: acquiring the current water level, the safe water level of the front pool of each stage pump station and the current output flow of each stage pump station; calculating the error between the safe water level and the current water level of the front pool of each stage pump station; feeding back the flow of the next stage pump station to the previous stage pump station; the previous stage pump station calculates the output flow of the previous stage pump station according to the fed-back flow of the next stage pump station and the error between the safe water level and the current water level of the next stage pump station; and calculating the output flow of each stage pump station and controlling the water level of the front pool of each stage pump station to the safe water level. According to the multi-stage linkage relationship of the pump station, the application provides a joint control logic method to synchronously control the flow of each stage pump station and then synchronously adjust the height of each stage front-pool water level to the safe water level.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of automatic control, and particularly relates to a method and system for controlling the water level of a front pool of a cascade pump station based on inter-stage feedback. BACKGROUND

[0002] A single-stage pump station is composed of several water pump units and a front pool, while a cascade pump station is composed of multiple pump stations connected in series to form a long-distance water conveyance project.

[0003] The core task of the joint dispatching of a cascade pump station is to ensure the safe operation of the units and to ensure that the water level of the front pool of each pump station is maintained within a certain safe range under different working flow rates.

[0004] Due to the series structure of the cascade pump station, when a certain stage of the pump station is controlled, the operation of the upper and lower stages of the pump station will be affected at the same time. The traditional pump station dispatching control method considers less the influence between the stages of the pump station, and it is difficult to achieve satisfactory control effect. SUMMARY

[0005] To solve the above technical problems, the present application provides a technical scheme of a method for controlling the water level of a front pool of a cascade pump station based on inter-stage feedback to solve the above technical problems.

[0006] The first aspect of the present application discloses a method for controlling the water level of a front pool of a cascade pump station based on inter-stage feedback, which comprises:

[0007] Step S1, obtaining the current water level of the front pool of each stage of the pump station, the safe water level, and the current output flow rate of each stage of the pump station;

[0008] Step S2, calculating the error between the safe water level and the current water level of the front pool of each stage of the pump station;

[0009] Step S3, feeding back the flow rate of the next stage of the pump station to the previous stage of the pump station; the previous stage of the pump station calculates the output flow rate of the previous stage of the pump station according to the flow rate fed back by the next stage of the pump station and the error between the safe water level and the current water level of the next stage of the pump station;

[0010] Step S4, repeating steps S1-S3 to calculate the output flow rate of each stage of the pump station and control the water level of the front pool of each stage of the pump station to the safe water level.

[0011] According to the method of the first aspect of the present application, in the step S2, the method for calculating the error between the safe water level and the current water level of the front pool of each stage of the pump station comprises:

[0012]

[0013] wherein, e nError of safe water level and current water level of front pool of nth stage pump station; H n0 Safe water level of front pool of nth stage pump station; H n(x-1) Current water level of front pool of nth stage pump station at x-1 moment.

[0014] According to the method of the first aspect of the application, in the step S3, the method for the former stage pump station to calculate the output flow of the former stage pump station according to the flow fed back by the latter stage pump station and the error of the safe water level and the current water level of the latter stage pump station comprises:

[0015]

[0016] Wherein, Q n-1 Output flow of n-1 stage pump station; Q n Output flow of nth stage pump station, i.e. flow provided to water plant, is a set value and remains unchanged in a control period; e n Error of safe water level and current water level of front pool of nth stage pump station; K n-1 Output flow control coefficient of n-1 stage pump station; Q1 represents output flow of 1st stage pump station; Q2 represents output flow of 2nd stage pump station; e2 represents error of safe water level and current water level of front pool of 2nd stage pump station; K1 represents output flow control coefficient of 1st stage pump station; Q0 represents input flow of 1st stage pump station; Q1 represents output flow of 1st stage pump station; e1 represents error of safe water level and current water level of front pool of 1st stage pump station; K0 represents input flow control coefficient of 1st stage pump station.

[0017] The second aspect of the application discloses a front pool water level control system of cascade pump station, which comprises:

[0018] The first processing module is configured to acquire the current water level, safe water level of front pool of each stage pump station and current output flow of each stage pump station;

[0019] The second processing module is configured to calculate the error of safe water level and current water level of front pool of each stage pump station;

[0020] The third processing module is configured to feed back the flow of latter stage pump station to former stage pump station; the former stage pump station calculates the output flow of the former stage pump station according to the flow fed back by the latter stage pump station and the error of safe water level and current water level of the latter stage pump station;

[0021] The fourth processing module is configured to calculate the output flow of each stage pump station and control the water level of front pool of each stage pump station to safe water level.

[0022] According to the system of the second aspect of the present application, the second processing module is configured to calculate the error of the safe water level and the current water level of the front pool of the nth pump station, including:

[0023]

[0024] wherein e n represents the error of the safe water level and the current water level of the front pool of the nth pump station; H n represents the safe water level of the front pool of the nth pump station; H n-1 represents the current water level of the front pool of the nth pump station at x-1 time. n n0 n(x-1)

[0025] According to the system of the second aspect of the present application, the third processing module is configured to calculate the output flow of the front-stage pump station according to the flow fed back by the rear-stage pump station and the error of the safe water level and the current water level of the rear-stage pump station, including:

[0026]

[0027] wherein Q n-1 represents the output flow of the nth-1 pump station; Q n represents the output flow of the nth pump station, i.e. the flow provided to the water plant, which is a set value and remains unchanged in a control period; e n represents the error of the safe water level and the current water level of the front pool of the nth pump station; K n-1 represents the output flow control coefficient of the nth-1 pump station; Q1 represents the output flow of the first pump station; Q2 represents the output flow of the second pump station; e2 represents the error of the safe water level and the current water level of the front pool of the second pump station; K1 represents the output flow control coefficient of the first pump station; Q0 represents the input flow of the first pump station; Q1 represents the output flow of the first pump station; e1 represents the error of the safe water level and the current water level of the front pool of the first pump station; K0 represents the input flow control coefficient of the first pump station. n-1 n n n-1

[0028] The third aspect of the present application discloses an electronic device. The electronic device comprises a memory and a processor, the memory stores a computer program, and the processor implements the steps of any one of the cascade pump station front pool water level control methods based on inter-stage feedback in the first aspect of the present application when executing the computer program.

[0029] The fourth aspect of the present application discloses a computer readable storage medium. The computer readable storage medium stores a computer program, and the computer program implements the steps of any one of the cascade pump station front pool water level control methods based on inter-stage feedback in the first aspect of the present application when executed by a processor.

[0030] ​​​​​​​It can be seen that according to the multi-stage linkage relationship of the pump stations, the joint control logic method is provided to synchronously control the flow of the pump stations, and then to synchronously adjust the height of the water level of the front pools of the pump stations to the safe water level. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, hereinafter, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0032] Figure 1 A flow chart of a front pool water level control method of a cascade pump station based on inter-stage feedback according to an embodiment of the present application;

[0033] Figure 2 A schematic diagram of a three-stage pump station according to an embodiment of the present application;

[0034] Figure 3 A water level control loop diagram of a front pool of a three-stage pump station according to an embodiment of the present application;

[0035] Figure 4 A structure diagram of a front pool water level control system of a cascade pump station according to an embodiment of the present application;

[0036] Figure 5 A structure diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present application.

[0038] The first aspect of the present application discloses a front pool water level control method of a cascade pump station based on inter-stage feedback. Figure 1 A flow chart of a front pool water level control method of a cascade pump station based on inter-stage feedback according to an embodiment of the present application, as shown in Figure 1 The method comprises the following steps.

[0039] Step S1, obtaining the current water level of the front pool of each stage pump station, the safe water level and the current output flow of each stage pump station;

[0040] Step S2: Calculate the error between the safe water level and the current water level in the forebay of each pumping station;

[0041] Step S3: Feed back the flow rate of the downstream pumping station to the upstream pumping station; the upstream pumping station calculates the output flow rate of the upstream pumping station based on the feedback flow rate of the downstream pumping station and the error between the safe water level of the downstream pumping station and the current water level.

[0042] Step S4: Repeat steps S1 to S3 to calculate the output flow rate of each pumping station and control the water level of the forebay of each pumping station to a safe level.

[0043] In step S1, the current water level, safe water level, and current output flow rate of the forebay of each pumping station are obtained.

[0044] Specifically, the current water level {H1, H2, ..., H} of the forebay at each level of the pumping station is obtained through means such as level sensors. n} and the current output flow rates of each level of pumping station {Q0,Q1,…,Q n-1 Data. Set the safe water level {H} in the forebay of each pumping station. 10 H 20 ,…,H n0 The flow rate Q supplied to the water plant n .like Figure 2 As shown, taking a three-stage pumping station as an example, the current water level of the forebay of each pumping station is {49.6, 94.75, 64.65} (m), and the current output flow rate of each pumping station is {0.7, 0.7, 0.7} (m). 3 / s), safe water levels in the forebays of each pumping station {49.7, 94.7, 64.7} (m), and the flow rate supplied to the water plant is 0.7 (m³). 3 / s).

[0045] In step S2, the error between the safe water level of the forebay and the current water level of each pumping station is calculated.

[0046] In some embodiments, in step S2, the method for calculating the error between the safe water level and the current water level in the forebay of each pumping station includes:

[0047]

[0048] Among them, e n H represents the error between the safe water level and the current water level in the forebay of the nth-stage pumping station; n0 H represents the safe water level of the forebay of the nth-stage pumping station; n(x-1) This represents the current water level in the forebay of the nth pumping station at time x-1.

[0049] Specifically, the error between the safe water level and the current water level of the front pool of each stage pump station is {0.1, -0.05, 0.05} (m), which indicates that the water level of the front pool of the first stage, the second stage and the third stage needs to be raised by 0.1 (m), lowered by 0.05 (m) and raised by 0.05 (m) respectively.

[0050] In step S3, the flow of the next stage pump station is fed back to the previous stage pump station; the previous stage pump station calculates the output flow of the previous stage pump station according to the fed back flow of the next stage pump station and the error between the safe water level and the current water level of the next stage pump station.

[0051] In some embodiments, in the step S3, the method for calculating the output flow of the previous stage pump station according to the fed back flow of the next stage pump station and the error between the safe water level and the current water level of the next stage pump station includes:

[0052]

[0053] wherein, Q n-1 represents the output flow of the n-1 stage pump station; Q n represents the output flow of the n stage pump station, i.e. the flow provided to the water plant, which is a set value and remains unchanged in a control cycle; e n represents the error between the safe water level and the current water level of the front pool of the n stage pump station; K n-1 represents the output flow control coefficient of the n-1 stage pump station; Q1 represents the output flow of the first stage pump station; Q2 represents the output flow of the second stage pump station; e2 represents the error between the safe water level and the current water level of the front pool of the second stage pump station; K1 represents the output flow control coefficient of the first stage pump station; Q0 represents the input flow of the first stage pump station; Q1 represents the output flow of the first stage pump station; e1 represents the error between the safe water level and the current water level of the front pool of the first stage pump station; K0 represents the input flow control coefficient of the first stage pump station.

[0054] Specifically, the control coefficient of the output flow of each stage pump station is set to {1.7, 2.76, 1.72} (m 2 / s); the output flow of each stage pump station at the next time is calculated as {Q0, Q1, …, Q n-1 n}, according to the control coefficient of the output flow of each stage pump station, the error between the safe water level and the current water level and the output flow, the required output flow at the next time can be calculated as {0.732, 0.562, 0.786} (m 3 / s), and then the flow is adjusted according to the calculated value, and the control loop diagram is shown in Figure 3 .

[0055] In step S4, steps S1-S3 are repeated to calculate the output flow of each stage pump station and control the water level of the front pool of each stage pump station to the safe water level.

[0056] Specifically, the liquid level sensor is used to monitor and feedback each stage of the front pool, and the water level of each stage of the front pool at this moment is updated in real time, steps S1-S3 are repeated, the output flow of each stage of the pump station is calculated, and the water level of the front pool of each stage of the pump station is controlled to the safe water level.

[0057] In summary, the scheme provided by the application can control the flow of each stage of the pump station synchronously according to the multi-stage linkage relationship of the pump station, and further synchronously adjust the height of the water level of each stage of the front pool to the safe water level.

[0058] The second aspect of the application discloses a front pool water level control system of a cascade pump station. Figure 4 The structure diagram of the front pool water level control system of the cascade pump station according to the embodiment of the application is shown in Figure 1. Figure 4 As shown in the figure, the system 100 comprises:

[0059] The first processing module 101 is configured to obtain the current water level, the safe water level of the front pool of each stage of the pump station, and the current output flow of each stage of the pump station.

[0060] The second processing module 102 is configured to calculate the error between the safe water level and the current water level of the front pool of each stage of the pump station.

[0061] The third processing module 103 is configured to feed back the flow of the rear stage of the pump station to the front stage of the pump station, and the front stage of the pump station calculates the output flow of the front stage of the pump station according to the flow fed back by the rear stage of the pump station and the error between the safe water level and the current water level of the rear stage of the pump station.

[0062] The fourth processing module 104 is configured to calculate the output flow of each stage of the pump station, and control the water level of the front pool of each stage of the pump station to the safe water level.

[0063] According to the system of the second aspect of the application, the second processing module 102 is configured to calculate the error between the safe water level and the current water level of the front pool of each stage of the pump station.

[0064]

[0065] Wherein, e n represents the error between the safe water level and the current water level of the front pool of the nth stage of the pump station; H n0 represents the safe water level of the front pool of the nth stage of the pump station; H n(x-1) represents the current water level of the front pool of the nth stage of the pump station at x-1 moment.

[0066] According to the system of the second aspect of the present invention, the third processing module 103 is configured such that the preceding pumping station calculates the output flow rate of the preceding pumping station based on the flow rate fed back by the following pumping station and the error between the safe water level of the following pumping station and the current water level:

[0067]

[0068] Among them, Q n-1 Q represents the output flow rate of the (n-1)th stage pumping station; n This represents the output flow rate of the nth-level pumping station, i.e., the flow rate supplied to the water plant, which is a setpoint that remains constant within one control cycle; e n K represents the error between the safe water level and the current water level in the forebay of the nth-stage pumping station; n-1 The output flow control coefficient of the (n-1)th stage pump station; Q1 represents the output flow of the first stage pump station; Q2 represents the output flow of the second stage pump station; e2 represents the error between the safe water level and the current water level in the forebay of the second stage pump station; K1 is the output flow control coefficient of the first stage pump station; Q0 represents the input flow of the first stage pump station; Q1 represents the output flow of the first stage pump station; e1 represents the error between the safe water level and the current water level in the forebay of the first stage pump station; K0 is the input flow control coefficient of the first stage pump station.

[0069] A third aspect of this invention discloses an electronic device. The electronic device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps of the method for controlling the water level in the forebay of a cascade pumping station based on inter-stage feedback, as disclosed in any of the first aspects of this invention.

[0070] Figure 5 This is a structural diagram of an electronic device according to an embodiment of the present invention, such as... Figure 5 As shown, the electronic device includes a processor, memory, communication interface, display screen, and input device connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, Near Field Communication (NFC), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input device can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the device's casing, or an external keyboard, touchpad, or mouse.

[0071] Those skilled in the art will understand thatFigure 5 The structure shown in the figure is only a structure diagram of part of the technical solution of the present disclosure, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0072] The fourth aspect of the present application discloses a computer readable storage medium. The computer readable storage medium stores a computer program. When the computer program is executed by a processor, the steps in the computer program are implemented.

[0073] Please note that the technical features of the above embodiments can be combined in any way. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combination of the technical features does not exist, it should be considered as the scope of the description. The above examples only express several embodiments of the present application, and the description is more specific and detailed, but it should not be construed as a limitation on the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. A method for controlling the water level in the forebay of a cascade pumping station based on inter-stage feedback, characterized in that, The method includes: Step S1: Obtain the current water level, safe water level, and current output flow rate of the forebay of each pumping station; Step S2: Calculate the error between the safe water level and the current water level in the forebay of each pumping station; Step S3: Feed back the flow rate of the downstream pumping station to the upstream pumping station; the upstream pumping station calculates the output flow rate of the upstream pumping station based on the flow rate fed back by the downstream pumping station and the error between the safe water level of the downstream pumping station and the current water level. Step S4: Repeat steps S1 to S3 to calculate the output flow rate of each pumping station and control the water level of the forebay of each pumping station to a safe level. In step S2, the method for calculating the error between the safe water level and the current water level in the forebay of each pumping station includes: Among them, e n H represents the error between the safe water level and the current water level in the forebay of the nth-stage pumping station; n0 H represents the safe water level of the forebay of the nth-stage pumping station; n(x-1) This represents the current water level in the forebay of the nth pumping station at time x-1; In step S3, the method by which the upstream pumping station calculates the output flow rate of the upstream pumping station based on the flow rate fed back by the downstream pumping station and the error between the safe water level of the downstream pumping station and the current water level includes: Among them, Q n-1 Q represents the output flow rate of the (n-1)th stage pumping station; n This represents the output flow rate of the nth-level pumping station, i.e., the flow rate supplied to the water plant, which is a setpoint that remains constant within one control cycle; e n K represents the error between the safe water level and the current water level in the forebay of the nth-stage pumping station; n-1 Q1 represents the output flow control coefficient of the (n-1)th stage pump station; Q2 represents the output flow of the first stage pump station; e2 represents the error between the safe water level and the current water level in the forebay of the second stage pump station; K1 represents the output flow control coefficient of the first stage pump station; Q0 represents the input flow of the first stage pump station; e1 represents the error between the safe water level and the current water level in the forebay of the first stage pump station; K0 represents the input flow control coefficient of the first stage pump station.

2. A forebay water level control system for a cascade pumping station, characterized in that, The system employs the method described in claim 1, and the system comprises: The first processing module is configured to obtain the current water level, safe water level and current output flow of the forebay of each pumping station; The second processing module is configured to calculate the error between the safe water level of the forebay and the current water level at each level of pumping station. The third processing module is configured to feed back the flow rate of the downstream pumping station to the upstream pumping station; the upstream pumping station calculates the output flow rate of the upstream pumping station based on the flow rate fed back by the downstream pumping station and the error between the safe water level of the downstream pumping station and the current water level. The fourth processing module is configured to calculate the output flow of each pumping station and control the water level of the forebay of each pumping station to a safe level.

3. An electronic device, characterized in that, The electronic device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, it implements the steps in the method for controlling the water level of the forebay of a cascade pumping station based on inter-stage feedback as described in claim 1.

4. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for controlling the water level of a cascade pumping station forebay based on inter-stage feedback as described in claim 1.

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