Drum water level protection device, method and power generation system

Abstract

The embodiment of the present invention provides a drum water level protection device, method and power generation system, wherein the drum water level protection device is applied to a power generation system, wherein the power generation system includes a drum and a water supply pipe connected to the drum, and the drum water level protection device includes: a flow transmitter, P logic delay circuits, a first data selector, a second data selector and a logic operation circuit, wherein P is an integer greater than 1. The embodiment of the present invention helps to improve the reliability of the drum water supply process and reduce the risk of equipment damage in the power generation system due to water supply accidents.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation, and in particular to a drum water level protection device, method and power generation system. Background Art

[0002] In power generation systems such as drum boilers in thermal power plants, the main water supply pipeline is the main pipeline that directly supplies water to the boiler. During the operation of the power generation system, the actuator of the electric door of the main water supply pipeline may be affected by internal or external factors, and the actuator may malfunction and automatically close the valve. For example, due to the vibration of the position of the electric door of the main water supply pipeline, the internal wiring of the actuator is loose, which may cause the actuator to malfunction and automatically close the valve. In the prior art, it is often difficult to timely detect the malfunction of the actuator of the electric door of the main water supply pipeline. When the actuator is mistakenly closed and is not discovered in time, it will cause the main water supply pipeline to be interrupted and the boiler to dry burn, which will bring a greater risk of equipment damage. Summary of the invention

[0003] The embodiments of the present invention provide a drum water level protection device, method and power generation system to solve the defect that it is difficult to timely detect the malfunction of the actuator in the main feed water in the prior art, which brings a greater risk of equipment damage.

[0004] In order to solve the above-mentioned technical problems, the present invention is achieved as follows:

[0005] An embodiment of the present invention provides a drum water level protection device, which is applied to a power generation system, wherein the power generation system includes a drum and a water supply pipe connected to the drum, and the drum water level protection device includes: a flow transmitter, P logic delay circuits, a first data selector, a second data selector, and a logic operation circuit, wherein P is an integer greater than 1;

[0006] Among them, the flow transmitter is installed on the water supply pipe, and the flow transmitter is respectively connected to the input end of each of the P logic delay circuits; the output end of each of the P logic delay circuits is respectively connected to the input end of the first data selector and the input end of the second data selector, and the output end of the first data selector and the output end of the second data selector are respectively connected to the first input end and the second input end of the logic operation circuit.

[0007] The embodiment of the present invention further provides a drum water level protection method applied in the above-mentioned drum water level protection device, comprising:

[0008] When a trigger signal is received, P flow data under P delays are obtained, wherein the P delays correspond to the P flow data one by one, and P is an integer greater than 1;

[0009] Determine maximum flow data and minimum flow data from the P flow data;

[0010] Determine whether the flow difference between the maximum flow data and the minimum flow data is greater than or equal to a flow threshold;

[0011] When the flow difference is greater than or equal to the flow threshold, a first instruction is generated, where the first instruction is used to control the opening of the water supply pipeline.

[0012] The embodiment of the present invention further provides a power generation system, comprising a steam drum, a water supply pipe connected to the steam drum, and the steam drum water level protection device mentioned above;

[0013] The flow transmitter included in the drum water level protection device is installed on the water supply pipeline.

[0014] The drum water level protection device provided in the embodiment of the present invention can further obtain the difference between the maximum and minimum flow rates in the water supply pipe during the set delay period by setting a flow transmitter, P logic delay circuits, a first data selector, a second data selector and a logic operation circuit, and determine whether the water supply pipe is closed in combination with the flow threshold, thereby helping to improve the reliability of the drum water supply process and reduce the risk of equipment damage in the power generation system due to water supply accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0016] Figure 1 A schematic diagram of the structure of a drum water level protection device provided in an embodiment of the present invention;

[0017] Figure 2 Another structural schematic diagram of a drum water level protection device provided by an embodiment of the present invention;

[0018] Figure 3 A flow chart of a drum water level protection method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] like Figure 1 As shown, the drum water level protection device provided in the embodiment of the present invention is applied to a power generation system, wherein the power generation system includes a drum and a water supply pipe connected to the drum, and the drum water level protection device includes: a flow transmitter 110, P logic delay circuits 120, a first data selector 130, a second data selector 140 and a logic operation circuit 150, wherein P is an integer greater than 1;

[0022] Among them, the flow transmitter 110 is installed on the water supply pipe, and the flow transmitter 110 is respectively connected to the input end of each logic delay circuit 120 in the P logic delay circuits 120; the output end of each logic delay circuit 120 in the P logic delay circuits 120 is respectively connected to the input end of the first data selector 130 and the input end of the second data selector 140, and the output end of the first data selector 130 and the output end of the second data selector 140 are respectively connected to the first input end and the second input end of the logic operation circuit 150.

[0023] It is easy to understand that the flow transmitter 110 can be a sensor structure that can obtain flow data in a water supply pipeline.

[0024] The logic delay circuit 120 may be a circuit structure that performs a preset operation after delaying a set time after receiving a trigger signal. Specifically in this embodiment, the logic delay circuit 120 may have an input terminal for connecting to the flow transmitter 110, and a corresponding control terminal. After receiving the trigger signal, the control terminal delays a set time, such as 20s, 40s or other time, and then obtains the data collected by the flow transmitter 110. In this embodiment, the P logic delay circuits 120 set may correspond to multiple delays, such as 20s, 40s, 60s, 80s, 100s and 120s.

[0025] The data selector can be used to select multiple input data, such as taking the maximum value, minimum value or median value among multiple input data. In this embodiment, the first data selector 130 can be used to take the maximum value among multiple input data, that is, the flow data; the second data selector 140 can remove the minimum value of multiple input flow data.

[0026] The logic operation circuit 150 may be a circuit for performing logic operations on input data and inputting operation results. In this embodiment, the logic operation circuit 150 may be used to compare the difference between the maximum value and the minimum value in the flow data with the flow threshold. If the difference between the maximum value and the minimum value is greater than or equal to the flow threshold, it means that the main water supply flow rate is decreasing at a fast rate, and the water supply pipeline may have been closed. In order to reduce the risk of equipment failure in the power generation system, an instruction for prompting the user or controlling the opening of the water supply pipeline may be input.

[0027] The drum water level protection device provided in the embodiment of the present invention can further obtain the difference between the maximum and minimum flow rates in the water supply pipe during the set delay period by setting a flow transmitter 110, P logic delay circuits 120, a first data selector 130, a second data selector 140 and a logic operation circuit 150, and determine whether the water supply pipe is closed in combination with the flow threshold, thereby helping to improve the reliability of the drum water supply process and reduce the risk of equipment damage in the power generation system due to water supply accidents.

[0028] In one example, the water supply pipe is a main water supply pipe of a steam drum.

[0029] Alternatively, if Figure 2 As shown, the drum water level protection device further includes a third data selector 160, the number of the flow transmitters 110 is Q, and Q is an integer greater than 1;

[0030] The Q flow transmitters 110 are all connected to the input end of the third data selector 160 , and the output end of the third data selector 160 is respectively connected to the input end of each logic delay circuit 120 in the P logic delay circuits 120 .

[0031] As shown above, the data selector can be used to select multiple input data. In this embodiment, the number of flow transmitters 110 is set to multiple, and the data provided by multiple flow transmitters 110 at the same time can be selected based on the third data selector 160, such as taking the median, etc., which can effectively improve the quality of the final flow data.

[0032] In one example, the flow transmitter 110 is connected to an analog input terminal of a distributed control system (DCS) via a cable, and the data selector receives data from the DCS for selection. Optionally, the DCS is also connected to a display device for displaying the flow data collected by the flow transmitter 110.

[0033] Alternatively, if Figure 2 As shown, the first data selector 130 includes M first sub-data selectors 131 and one second sub-data selector 132, and the second data selector 140 includes M third sub-data selectors 141 and one fourth sub-data selector 142; the P logic delay circuits 120 belong to M preset logic delay circuit 120 groups; the M preset logic delay circuit 120 groups, the M first sub-data selectors 131 and the M third sub-data selectors 141 correspond one to one;

[0034] The output ends of all the logic delay circuits 120 in each of the preset logic delay circuit 120 groups are connected to the input ends of the corresponding first sub-data selector 131, and are connected to the input ends of the corresponding third sub-data selector 141, the output ends of the M first sub-data selectors 131 are connected to the input ends of the second sub-data selector 132, the output ends of the M third sub-data selectors 141 are connected to the input ends of the fourth sub-data selector 142, and the output end of the second sub-data selector 132 and the output ends of the four sub-data selectors are respectively connected to the first input end and the second input end of the logic operation circuit 150; wherein M is an integer greater than 1 and less than Q.

[0035] Taking P equal to 9, and P logic delay circuits 120 corresponding to delays (Delay) of 20s, 40s, 60s, 80s, 100s, 120s, 140s, 160s, and 180s respectively, the logic delay circuits 120 with delays of 20s, 40s, and 60s can be used as the first logic delay circuit 120 group, the logic delay circuits 120 with delays of 80s, 100s, and 120s can be used as the second logic delay circuit 120 group, and the logic delay circuits 120 with delays of 140s, 160s, and 180s can be used as the third logic delay circuit 120 group. The first sub-data selector 131 can be used to select one out of three (Thr Sel) to obtain the maximum value; the outputs of the three logic delay circuits 120 corresponding to each logic delay circuit 120 group are input to the corresponding first sub-data selector 131 to output the maximum value, and the outputs of the three first sub-data selectors 131 are input to the second sub-data selector 132 to further select one out of three to obtain the maximum value, and the maximum flow rate in the water supply pipeline under 9 delays is obtained. Similarly, the third sub-data selector 141 can be used to select one out of three to obtain the minimum value, and the outputs of the three third sub-data selectors 141 are input to the fourth sub-data selector 142 to further select one out of three to obtain the minimum value, and the minimum flow rate in the water supply pipeline under 9 delays is obtained.

[0036] The maximum flow rate and the minimum flow rate are respectively input into the logic operation circuit 150 , and the logic operation circuit 150 can further compare the difference between the two inputs with the flow rate threshold value and output a corresponding comparison result.

[0037] Compared to a structure that directly takes the maximum or minimum value of the output values ​​from multiple logic delay circuits 120, this embodiment connects multiple data selectors in series and takes the maximum or minimum value step by step, which helps to reduce the amount of input data of each data selector, thereby helping to reduce the difficulty of calculation and save calculation costs.

[0038] In some feasible implementations, the maximum or minimum value can be obtained in three or more stages according to actual needs, that is, three or more data selectors are connected in series on a line for data selection to obtain the maximum and minimum flow rates of the water supply pipeline.

[0039] Alternatively, if Figure 2 As shown, the power generation system further includes an electric door installed on the water supply pipe, and the drum water level protection device includes a first AND gate circuit 210;

[0040] The output end of the logic operation circuit 150 and the electric gate are respectively connected to the first input end and the second input end of the first AND gate circuit 210, and the output end of the first AND gate circuit 210 is connected to the electric gate.

[0041] In this embodiment, the logic operation circuit 150 can compare the difference between the maximum flow rate and the minimum flow rate of the water supply pipeline within the maximum delay with the flow threshold value, and output the corresponding comparison result. The electric door can include a valve, an actuator 220 for adjusting the valve opening, and an opening monitoring device 230 for outputting the state information of the electric door, wherein the valve can be driven by the actuator 220 to open or close the water supply pipeline. The first AND gate circuit 210 can perform an AND operation based on the output signal corresponding to the logic operation circuit 150 and the electric door to obtain a corresponding operation result.

[0042] Similarly, taking the above-mentioned drum water level protection device with 9 logic delay circuits 120 as an example, the maximum flow rate and the minimum flow rate of the water supply pipeline within 180s can be obtained respectively through the first data selector 130 and the second data selector 140. If the flow threshold is 100t / h, when the difference between the maximum flow rate and the minimum flow rate of the water supply pipeline within the above 180s is greater than or equal to 100t / h, a digital signal 1 can be output, indicating that the actuator 220 of the electric door may have erroneously closed the valve. The electric door may include a valve, an actuator 220, and an opening monitoring device 230. If the opening monitoring device 230 is used to monitor whether the valve of the electric door is fully opened, if it is not fully opened, the digital signal input to the first AND gate circuit 210 may be 1. When the digital signals outputted by the logic operation circuit 150 and the electric door corresponding to the digital signals are both 1, the digital signal 1 is obtained after the operation of the first AND gate circuit 210, indicating that the water flow in the water supply pipe is reduced due to a valve problem. At this time, the signal outputted by the first AND gate circuit 210 can be used to control the action of the actuator 220 of the electric door to open the valve of the water supply pipe, thereby helping to eliminate the dry burning of the boiler caused by the low water level in the drum due to the closure of the electric door on the water supply pipe, thereby improving the reliability of the drum water supply function and reducing the risk of boiler damage due to water supply.

[0043] In one example, when the digital signal output by the logic operation circuit 150 is 0, it means that the difference between the maximum flow rate and the minimum flow rate of the water supply pipeline within 180s is less than 100t / h, which may be within the normal water supply flow floating range. When the digital signal input to the first AND gate circuit 210 corresponding to the opening monitoring device 230 is 0, it means that the valve of the electric door has been opened. In both cases, there is no need to further open the valve.

[0044] Optionally, the drum water level protection device also includes a second AND gate circuit 240 and a NOT gate circuit 250, the electric gate, the NOT gate circuit 250 and the first input end of the second AND gate circuit 240 are connected in sequence, the second input end of the second AND gate circuit 240 is the grid-connected status information input end of the power generation system, and the output end of the second AND gate circuit 240 is connected to the second input end of the first AND gate circuit 210.

[0045] In this embodiment, considering that the opening monitoring device 230 of the electric door on the water supply pipeline may output the corresponding signal only after the valve is fully opened, a NOT gate circuit 250 is added after the electric door; in addition, considering that the power generation system may be in debugging, maintenance or other states when it is not connected to the grid, there may be no risk of boiler damage due to water supply. Therefore, in this embodiment, by further setting a second AND gate circuit 240 and a NOT gate circuit 250 on the basis of the previous embodiment, it is helpful to realize that when the power generation system is connected to the grid, the electric door valve fully opened signal is not detected, and the difference between the maximum flow rate and the minimum flow rate of the water supply pipeline is greater than or equal to the flow rate threshold, the valve of the electric door is controlled to open, thereby improving the rationality of control.

[0046] In one example, the second input terminal of the second AND gate circuit 240 is connected to a grid-connected state determination device 260 for acquiring grid-connected state information.

[0047] Compared with the existing manual method of judging whether the feed water flow rate is deviated, the drum water level protection device provided by the embodiment of the present invention is stable and reliable. In addition, the drum water level protection device is simple to install and debug on site, has high reliability, and helps to ensure the safe operation of the boiler.

[0048] like Figure 3 As shown, an embodiment of the present invention further provides a drum water level protection method applied in the above-mentioned drum water level protection device, comprising:

[0049] Step 301, when a trigger signal is received, obtaining P flow data under P delays, wherein the P delays correspond to the P flow data one by one, and P is an integer greater than 1;

[0050] Step 302, determining the maximum flow data and the minimum flow data from the P flow data;

[0051] Step 303, determining whether the flow difference between the maximum flow data and the minimum flow data is greater than or equal to a flow threshold;

[0052] Step 304: When the flow difference is greater than or equal to the flow threshold, generate a first instruction, wherein the first instruction is used to control the opening of the water supply pipeline.

[0053] The trigger signal is used to control the logic delay circuit to start timing, and when the delay reaches the set value, the flow data at that moment is obtained. When the trigger signal is received, P logic delay circuits can correspond to P delays, and collect flow data under P delays respectively; for example, 9 logic delay circuits are set to obtain 9 flow data under 9 delays of 20s, 40s, 60s, ..., 180s.

[0054] After collecting P flow data, the maximum flow data and the minimum flow data can be selected from them. The difference between these two flow data can reflect the maximum change in water flow in the water supply pipeline within a period of time.

[0055] In combination with actual applications, when the drum is in a normal working state, the change in water flow is usually within an empirical range. When the change in water flow is large within a period of time, it may be caused by the closure of the water supply pipeline. Therefore, it can be determined whether the flow difference between the maximum flow data and the minimum flow data is greater than or equal to the flow threshold. If it is greater than or equal to the flow threshold, a first instruction for controlling the opening of the water supply pipeline is generated. For example, according to the first instruction, the valve of the electric door in the water supply pipeline is opened.

[0056] The drum water level protection method provided in an embodiment of the present invention obtains P flow data under P delays, calculates the difference between the maximum flow data and the minimum flow data in the P flow data, and generates a first instruction for controlling the opening of the water supply pipeline when the above difference is greater than or equal to the flow threshold; it helps to improve the reliability of the drum water supply process and reduce the risk of equipment damage in the power generation system due to water supply accidents.

[0057] Optionally, the first instruction may also be used to control a set alarm device to send out an alarm message.

[0058] Optionally, obtaining P traffic data under P delays includes:

[0059] Under any of the P delays, Q pieces of original flow information from Q flow transmitters are obtained, the Q flow transmitters correspond one-to-one to the Q pieces of original flow information, and Q is an integer greater than 1;

[0060] According to the first preset rule, the flow data under the corresponding delay is determined from the Q original flow information.

[0061] In this embodiment, Q pieces of original flow information from Q redundantly set flow transmitters can be obtained at the same time under any delay. The first preset rule can be to take the median or average value, etc., which can effectively improve the quality of flow data.

[0062] Optionally, determining maximum flow data and minimum flow data from the P flow data includes:

[0063] When P is greater than 2, the P delays are allocated to M delay groups, where M is an integer greater than 1 and less than P;

[0064] Respectively obtain the initial maximum flow data and the initial minimum flow data corresponding to each delay group in the M delay groups, and obtain M initial maximum flow data and M initial minimum flow data;

[0065] The maximum flow data is determined from the M initial maximum flow data, and the minimum flow data is determined from the M initial minimum flow data.

[0066] In this embodiment, the process of determining the maximum flow data and the minimum flow data from the P flow data is decomposed into multiple stages. For example, the P delays correspond to delays of 20s, 40s, 60s, 80s, 100s, 120s, 140s, 160s, and 180s, respectively. The 9 delays can be first allocated to 3 delay groups, 20s, 40s, and 60s as the first group, 80s, 100s, and 120s as the second group, and 140s, 160s, and 180s as the third group. The initial maximum flow data and the initial minimum flow data are obtained for the three delay groups, respectively, and then the maximum flow data is determined from the 3 initial maximum flow data, and the minimum flow data is determined from the 3 initial minimum flow data. In this way, the number of data input in each step of determining the maximum value or minimum value can be reduced, thereby reducing the difficulty of calculation and saving calculation costs.

[0067] In some feasible implementations, according to actual needs, for example, when a large number of delays are selected, the maximum or minimum value of the flow data can be obtained in three or more stages.

[0068] Optionally, generating the first instruction includes:

[0069] Acquire the grid-connected status information of the power generation system and the status information of the electric door located on the water supply pipeline;

[0070] When the flow difference is greater than or equal to the flow threshold, the grid-connected status information of the power generation system indicates that the power generation system is in a grid-connected state, and the status information of the electric door indicates that the valve is not fully opened, the first instruction is generated, and the first instruction is used to control the electric door to open the water supply pipe.

[0071] Considering that when the flow difference is less than the flow threshold, the flow change may be within the normal water supply flow floating range; or, when the power generation system is not connected to the grid, it may be in debugging, maintenance or other states, and there may be no risk of boiler damage due to water supply; or, when the status information of the electric door is characterized by the valve being fully opened, the water supply pipeline is not in a closed state. Therefore, in this embodiment, it is defined that when the flow difference is greater than or equal to the flow threshold, the grid-connected status information of the power generation system is characterized as the power generation system being in a grid-connected state, and the status information of the electric door is characterized as the valve not being fully opened, the first instruction is generated to control the electric door to open the water supply pipeline, which can improve the rationality of control.

[0072] The embodiment of the present invention further provides a power generation system, comprising a steam drum, a water supply pipe connected to the steam drum, and the steam drum water level protection device mentioned above;

[0073] The flow transmitter included in the drum water level protection device is installed on the water supply pipeline.

[0074] It should be noted that the power generation system is a system that applies the above-mentioned drum water level protection device. All implementation methods in the above-mentioned drum water level protection device embodiment are applicable to the embodiments of the power generation system and can achieve the same technical effects.

[0075] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned drum water level protection method is implemented.

[0076] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various modifications or variations within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. A drum water level protection device, applied to a power generation system, characterized in that: The power generation system includes a steam drum and a water supply pipe connected to the steam drum, and the steam drum water level protection device includes: a flow transmitter, P logic delay circuits, a first data selector, a second data selector and a logic operation circuit, wherein P is an integer greater than 1; Wherein, the flow transmitter is installed on the water supply pipe, and the flow transmitter is respectively connected to the input end of each logic delay circuit in the P logic delay circuits; the output end of each logic delay circuit in the P logic delay circuits is respectively connected to the input end of the first data selector and the input end of the second data selector, and the output end of the first data selector and the output end of the second data selector are respectively connected to the first input end and the second input end of the logic operation circuit; The first data selector includes M first sub-data selectors and one second sub-data selector, and the second data selector includes M third sub-data selectors and one fourth sub-data selector; the P logic delay circuits belong to M preset logic delay circuit groups; the M preset logic delay circuit groups, the M first sub-data selectors, and the M third sub-data selectors correspond one to one; The output ends of all logic delay circuits in each of the preset logic delay circuit groups are connected to the input end of the corresponding first sub-data selector, and are connected to the input end of the corresponding third sub-data selector, the output ends of the M first sub-data selectors are connected to the input end of the second sub-data selector, the output ends of the M third sub-data selectors are connected to the input end of the fourth sub-data selector, and the output end of the second sub-data selector and the output end of the fourth sub-data selector are connected to the first input end and the second input end of the logic operation circuit respectively; wherein M is an integer greater than 1 and less than Q; The drum water level protection device further comprises a third data selector, the number of the flow transmitters is Q, and Q is an integer greater than 1; The Q flow transmitters are all connected to the input end of the third data selector, and the output end of the third data selector is respectively connected to the input end of each logic delay circuit in the P logic delay circuits.

2. The drum water level protection device according to claim 1, characterized in that: The power generation system further comprises an electric door installed on the water supply pipe, and the drum water level protection device comprises a first AND gate circuit; The output end of the logic operation circuit and the electric gate are respectively connected to the first input end and the second input end of the first AND gate circuit, and the output end of the first AND gate circuit is connected to the electric gate.

3. The drum water level protection device according to claim 2, characterized in that: The drum water level protection device also includes a second AND gate circuit and a NOT gate circuit. The electric gate, the NOT gate circuit and the first input end of the second AND gate circuit are connected in sequence. The second input end of the second AND gate circuit is the grid-connected status information input end of the power generation system. The output end of the second AND gate circuit is connected to the second input end of the first AND gate circuit.

4. A drum water level protection method used in a drum water level protection device as claimed in any one of claims 1 to 3, characterized in that: include: When a trigger signal is received, P flow data under P delays are obtained, wherein the P delays correspond to the P flow data one by one, and P is an integer greater than 1; Determine the maximum flow data and the minimum flow data from the P flow data; Determine whether the flow difference between the maximum flow data and the minimum flow data is greater than or equal to a flow threshold; When the flow difference is greater than or equal to the flow threshold, a first instruction is generated, where the first instruction is used to control the opening of the water supply pipeline.

5. The drum water level protection method according to claim 4, characterized in that: The obtaining of P flow data under P delays includes: Under any of the P delays, Q pieces of original flow information from Q flow transmitters are obtained, the Q flow transmitters correspond one-to-one to the Q pieces of original flow information, and Q is an integer greater than 1; According to the first preset rule, the flow data under the corresponding delay is determined from the Q original flow information.

6. The drum water level protection method according to claim 4, characterized in that: Determining maximum flow data and minimum flow data from the P flow data includes: When P is greater than 2, the P delays are allocated to M delay groups, where M is an integer greater than 1 and less than P; Respectively obtain the initial maximum flow data and the initial minimum flow data corresponding to each delay group in the M delay groups, and obtain M initial maximum flow data and M initial minimum flow data; The maximum flow data is determined from the M initial maximum flow data, and the minimum flow data is determined from the M initial minimum flow data.

7. The drum water level protection method according to claim 4, characterized in that: The generating of the first instruction comprises: Acquire the grid-connected status information of the power generation system and the status information of the electric door located on the water supply pipeline; When the flow difference is greater than or equal to the flow threshold, the grid-connected status information of the power generation system indicates that the power generation system is in a grid-connected state, and the status information of the electric door indicates that the valve is not fully opened, the first instruction is generated, and the first instruction is used to control the electric door to open the water supply pipe.

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