A method for automatic dispatching water balance in waterworks

Abstract

The present invention relates to an automatic scheduling method for water balance of a water plant, comprising: obtaining the target water supply of the water plant based on the target scheduling pressure, real-time water supply and real-time water supply pressure of the water plant; obtaining the real-time production capacity, real-time load rate and real-time adjustable capacity of each process section based on the design capacity, real-time equipment status and real-time operation status of each process section, and further adopting the short board principle to obtain the real-time production capacity, real-time load rate and real-time adjustable capacity of each production line and the water plant; obtaining the target water intake of the water plant based on the target water supply and water distribution mode of the water plant; obtaining the target water intake of each production line based on the target water intake of the water plant, the real-time production capacity, real-time load rate and real-time adjustable capacity of each production line. The present invention improves the automation, intelligence and refinement level of the water plant, and ensures the safe, efficient and stable operation of the water plant.

Description

Technical Field

[0001] The invention relates to the technical field of water production in water plants, and in particular to an automatic water balance scheduling method for water plants. Background Art

[0002] my country's urban water supply enterprises began to apply automation technology in the 1970s, and in the 1990s, automation and informatization were studied as special subjects to guide the technological progress of the entire industry. At present, the overall development level of water plant automation is not high, and the development is still unbalanced. Although some water plants have gradually carried out automation construction, they have not yet fully realized the automation of water production processes. The automatic scheduling of water balance in water plants is an important manifestation of its automation application. At the same time, under the background of my country's smart city construction, modern water plants are developing from "automation" to "intelligence", which not only requires water plants to be able to achieve automatic production, but also requires water plants to have perception, storage, analysis and prediction capabilities. Summary of the invention

[0003] In view of this, the present invention provides an automatic scheduling method for water balance in a water plant. Based on the target scheduling pressure of the water plant, the method automatically analyzes and calculates the required water supply, evaluates the capacity and load of the water plant, and automatically calculates the total water intake required by the water plant and the water intake of each production line, thereby improving the automation, intelligence and refinement level of the water plant and ensuring the safe, efficient and stable operation of the water plant.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A method for automatically dispatching water balance in a waterworks, comprising:

[0006] The target water supply of the water plant is obtained based on the target dispatching pressure, real-time water supply and real-time water supply pressure of the water plant;

[0007] Based on the design capacity, real-time equipment status and real-time operation status of each process section, the real-time production capacity, real-time load rate and real-time adjustable capacity of each process section are obtained;

[0008] Based on the real-time production capacity, real-time load rate and real-time adjustable capacity of each process section, the short board principle is adopted to obtain the real-time production capacity, real-time load rate and real-time adjustable capacity of each production line and water plant;

[0009] Based on the target water supply and water allocation mode of the water plant, the target water inflow of the water plant is obtained;

[0010] The target water inflow of each production line is obtained based on the target water inflow of the water plant, the real-time production capacity of each production line, the real-time load rate and the real-time adjustable capacity.

[0011] Preferably, the target water supply of the water plant is obtained based on the target dispatching pressure, real-time water supply and real-time water supply pressure of the water plant, specifically:

[0012] Establishing a water supply analysis model; inputting the target dispatching pressure, real-time water supply and real-time water supply pressure of the water plant into the water supply analysis model to obtain the target water supply of the water plant;

[0013] A mapping relationship between water supply pressure and water supply volume is obtained based on a historical data set; and based on the mapping relationship, a fuzzy control method is used to obtain the water supply volume analysis model.

[0014] Preferably, the real-time production capacity, real-time load rate and real-time adjustable capacity of each process section are obtained based on the design capacity, real-time equipment status and real-time operation status of each process section, including:

[0015] The real-time production capacity of each process section is obtained based on the design capacity, real-time equipment status and real-time operation status of each process section;

[0016] The real-time load rate of each process section is obtained by dividing the real-time water supply of each process section by the real-time production capacity;

[0017] The real-time adjustable capacity of each process section is obtained by subtracting the real-time production capacity from the real-time water supply of each process section.

[0018] Preferably, the real-time production capacity, real-time load rate and real-time adjustable capacity of each process section are obtained by adopting the short board principle to obtain the real-time production capacity, real-time load rate and real-time adjustable capacity of each production line and water plant, specifically:

[0019] For each production line, the minimum value of the real-time production capacity of each process section to which it belongs is taken to obtain the real-time production capacity of each production line;

[0020] For each production line, the maximum value of the real-time load rates of each process section to which it belongs is taken to obtain the real-time load rate of each production line;

[0021] For each production line, the minimum value of the real-time adjustable capacity of each process section to which it belongs is taken to obtain the real-time adjustable capacity of each production line;

[0022] The real-time production capacity of the water plant is the sum of the real-time production capacities of each production line;

[0023] The real-time load rate of a water plant is the ratio of the sum of the real-time water inflow of each production line to the real-time production capacity of the water plant;

[0024] The real-time adjustable capacity of a water plant is the real-time production capacity of the water plant minus the sum of the real-time water intake of each production line.

[0025] Preferably, the target water inflow of the water plant is obtained based on the water supply and production balance model;

[0026] The water supply and water production balance model is as follows:

[0027] Q 进 =(1+k)×Q 供 +S(Hh)+Q 厂内 ;

[0028] Where: Q 进 is the target water inflow of the water plant, in m 3 / h; k is the water loss coefficient of each process section; Q 供 is the target water supply of the water plant, in m 3 / h; S is the reservoir bottom area, unit is m 3 ; H is the target liquid level of the reservoir, in m; h is the current liquid level of the reservoir, in m; Q 厂内 The water consumption of the water plant itself, in m 3 / h.

[0029] Preferably, the target water inflow of the water plant is obtained based on the target water supply and water distribution mode of the water plant, specifically:

[0030] The water distribution mode includes an energy efficiency mode and a steady state mode;

[0031] When the energy efficiency mode is selected, the target liquid level of the reservoir is given based on the principle of energy saving, and the target liquid level of the reservoir and the target water supply of the water plant are substituted into the water supply and water production balance model to obtain the target water inflow of the water plant;

[0032] When the steady-state mode is selected, the predicted reservoir liquid level after a set time length is obtained based on the water plant's target water supply, real-time water inflow and current reservoir liquid level; if the predicted reservoir liquid level is greater than or equal to the reservoir's minimum liquid level and less than or equal to the reservoir's maximum liquid level, the water plant's real-time water inflow is used as the water plant's target water inflow; if the predicted reservoir liquid level is less than the reservoir's minimum liquid level or the predicted reservoir liquid level is greater than the reservoir's maximum liquid level, a calculation is performed based on the reservoir's minimum liquid level and the reservoir's maximum liquid level to obtain the reservoir's target liquid level, and the reservoir's target liquid level and the water plant's target water supply are substituted into the water supply and water production balance model to obtain the water plant's target water inflow.

[0033] Preferably, the target liquid level of the reservoir is obtained by calculation based on the minimum liquid level of the reservoir and the maximum liquid level of the reservoir, and the calculation formula is as follows:

[0034] H=H L +(H H -HL ) / 2;

[0035] Where: H L is the minimum liquid level of the reservoir, H H The maximum liquid level of the reservoir.

[0036] Preferably, the target water inflow of each production line is obtained based on the target water inflow of the water plant, the real-time production capacity of each production line, the real-time load rate and the real-time adjustable capacity, specifically:

[0037] The target water inflow of the water plant is determined. If the difference between the target water inflow of the water plant and the real-time water inflow is within the set water volume threshold, the real-time water inflow of each production line is used as the target water inflow of each production line;

[0038] If the difference between the target water inflow of the water plant and the real-time water inflow is not within the set water volume threshold range, then based on the target water inflow of the water plant and the real-time production capacity, real-time load rate and real-time adjustable capacity of each production line, the principle of adjusting the load balance of the production line is adopted, and the number of production line adjustments is gradually increased to obtain several initial water inflow allocation plans, wherein the initial water inflow allocation plans include the adjusted target water inflow of each production line;

[0039] Taking the water inflow of each production line as a constraint condition within the production capacity threshold range, several initial water inflow allocation schemes are screened to obtain several preferred water inflow allocation schemes;

[0040] Evaluate a plurality of the preferred water inlet allocation schemes based on an evaluation function to obtain an evaluation value of each of the preferred water inlet allocation schemes; the evaluation function is based on a production line load difference and a production line adjustment number;

[0041] Selecting the preferred water inflow allocation scheme corresponding to the lowest evaluation value as the final water inflow allocation scheme;

[0042] The target water inflow of each production line is obtained based on the final water inflow allocation plan.

[0043] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0044] The present invention relates to an automatic scheduling method for water balance of a water plant, comprising: obtaining the target water supply of the water plant based on the target scheduling pressure, real-time water supply and real-time water supply pressure of the water plant; obtaining the real-time production capacity, real-time load rate and real-time adjustable capacity of each process section based on the design capacity, real-time equipment status and real-time operation status of each process section, and further adopting the short board principle to obtain the real-time production capacity, real-time load rate and real-time adjustable capacity of each production line and the water plant; obtaining the target water intake of the water plant based on the target water supply and water distribution mode of the water plant; obtaining the target water intake of each production line based on the target water intake of the water plant, the real-time production capacity, real-time load rate and real-time adjustable capacity of each production line. The present invention improves the automation, intelligence and refinement level of the water plant, and ensures the safe, efficient and stable operation of the water plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0046] Figure 1 The present invention is a flow chart of the method for automatic scheduling of water balance in a water plant. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] The purpose of the present invention is to provide a system based on the target scheduling pressure of the water plant, which can automatically analyze and calculate the required water supply, evaluate the capacity and load of the water plant, and automatically calculate the total water intake required by the water plant and the water intake of each production line, so as to improve the automation, intelligence and refinement level of the water plant and ensure the safe, efficient and stable operation of the water plant.

[0049] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] Figure 1 This is a flow chart of the automatic water balance dispatching method for a water plant according to the present invention. Figure 1 As shown, the present invention provides a method for automatically scheduling water balance in a water plant, comprising:

[0051] Step S1, obtaining the target water supply of the water plant based on the target dispatching pressure, real-time water supply and real-time water supply pressure of the water plant.

[0052] Optionally, step S1 is implemented based on a water supply analysis model.

[0053] First, a water supply analysis model is established; the target dispatching pressure, real-time water supply and real-time water supply pressure of the water plant are input into the water supply analysis model to obtain the target water supply of the water plant.

[0054] A mapping relationship between water supply pressure and water supply volume is obtained based on a historical data set; and based on the mapping relationship, a fuzzy control method is used to obtain the water supply volume analysis model.

[0055] Step S2, based on the design capacity, real-time equipment status and real-time operation status of each process section, obtain the real-time production capacity, real-time load rate and real-time adjustable capacity of each process section.

[0056] Specifically, the step S2 includes:

[0057] Step S21, obtaining the real-time production capacity of each process section based on the design capacity, real-time equipment status and real-time operation status of each process section.

[0058] The real-time production capacity of each process section is the production capacity of the structures and their equipment in good condition in each process section, that is, the real-time production capacity of each process section is the design capacity of each process section minus the production capacity of the structures and their equipment in faulty, overhaul and maintenance states in each process section.

[0059] Step S22, the real-time load rate of each process section is obtained by dividing the real-time water supply of each process section by the real-time production capacity.

[0060] Step S23, subtracting the real-time production capacity from the real-time water supply of each process section to obtain the real-time adjustable capacity of each process section.

[0061] Step S3, based on the real-time production capacity, real-time load rate and real-time adjustable capacity of each process section, the short board principle is adopted to obtain the real-time production capacity, real-time load rate and real-time adjustable capacity of each production line and water plant.

[0062] Furthermore, for each production line, the minimum value of the real-time production capacity of each process section is taken to obtain the real-time production capacity of each production line. For example, a production line has 10 process sections, and the real-time production capacities of the 10 process sections are 5, 8, 6, 7, 10, 3, 6, 8, 7 and 4 respectively; then the real-time production capacity of the current production line is 3.

[0063] For each production line, the maximum value of the real-time load rates of its respective process sections is taken to obtain the real-time load rate of each production line.

[0064] For each production line, the minimum value of the real-time adjustable capabilities of each process section to which it belongs is taken to obtain the real-time adjustable capability of each production line.

[0065] The real-time production capacity of a water plant is the sum of the real-time production capacities of each production line.

[0066] The real-time load rate of a water plant is the ratio of the sum of the real-time water intake of each production line to the real-time production capacity of the water plant.

[0067] The real-time adjustable capacity of a water plant is the real-time production capacity of the water plant minus the sum of the real-time water intake of each production line.

[0068] The step S2 and the step S3 together constitute a capacity load assessment model.

[0069] Step S4, obtaining the target water inflow of the water plant based on the target water supply and water distribution mode of the water plant.

[0070] Preferably, the step S4 obtains the target water inflow of the water plant based on a water supply and production balance model.

[0071] The water supply and water production balance model is as follows:

[0072] Q 进 =(1+k)×Q 供 +S×(Hh)+Q 厂内 ;

[0073] Where: Q 进 is the target water inflow of the water plant, in m 3 / h; k is the water loss coefficient of each process section; Q 供 is the target water supply of the water plant, in m 3 / h; S is the reservoir bottom area, unit is m 3 ; H is the target liquid level of the reservoir, in m; h is the current liquid level of the reservoir, in m; Q 厂内 The water consumption of the water plant itself, in m 3 / h.

[0074] Specifically, the step S4 is as follows:

[0075] The water distribution mode includes an energy efficiency mode and a steady state mode.

[0076] When the energy efficiency mode is selected, the target liquid level of the reservoir is given based on the energy saving principle, and the target liquid level of the reservoir and the target water supply of the water plant are substituted into the water supply and water balance model to obtain the target water intake of the water plant. The energy saving principle is to operate the reservoir at a high water level to improve the efficiency of the secondary pump of the water plant. In this embodiment, the target liquid level of the reservoir is reached based on a set interval time, for example, the target liquid level of the reservoir is reached in 1 hour or 2 hours.

[0077] When the steady-state mode is selected, the predicted reservoir liquid level after a set time length is obtained based on the water plant's target water supply, real-time water inflow and current reservoir liquid level; if the predicted reservoir liquid level is greater than or equal to the reservoir's minimum liquid level and less than or equal to the reservoir's maximum liquid level, the water plant's real-time water inflow is used as the water plant's target water inflow; if the predicted reservoir liquid level is less than the reservoir's minimum liquid level or the predicted reservoir liquid level is greater than the reservoir's maximum liquid level, a calculation is performed based on the reservoir's minimum liquid level and the reservoir's maximum liquid level to obtain the reservoir's target liquid level, and the reservoir's target liquid level and the water plant's target water supply are substituted into the water supply and water production balance model to obtain the water plant's target water inflow.

[0078] The target liquid level of the reservoir is obtained by calculation based on the minimum liquid level of the reservoir and the maximum liquid level of the reservoir. The calculation formula is as follows:

[0079] H=H L +(H H -H L ) / 2;

[0080] Where: H L is the minimum liquid level of the reservoir, H H The maximum liquid level of the reservoir.

[0081] Step S5, obtaining the target water inflow of each production line based on the target water inflow of the water plant, the real-time production capacity of each production line, the real-time load rate and the real-time adjustable capacity.

[0082] Preferably, the step S5 is specifically:

[0083] The target water inflow of the water plant is judged. If the difference between the target water inflow of the water plant and the real-time water inflow is within the set water volume threshold, the real-time water inflow of each production line is used as the target water inflow of each production line.

[0084] If the difference between the target water inflow of the water plant and the real-time water inflow is not within the set water volume threshold range, then based on the target water inflow of the water plant and the real-time production capacity, real-time load rate and real-time adjustable capacity of each production line, the principle of adjusting the load balance of the production line is adopted, and the number of production line adjustments is gradually increased to obtain several initial water inflow allocation plans, which include the adjusted target water inflow of each production line. According to the changes of adjusting one production line, adjusting two production lines, and adjusting N production lines, several initial water inflow allocation plans are obtained based on the principle of adjusting the load balance of the production lines. N is the total number of production lines.

[0085] Taking the water inflow of each production line within the production capacity threshold range as a constraint condition, several initial water inflow allocation schemes are screened to obtain several preferred water inflow allocation schemes. Among them, the production capacity threshold range is greater than or equal to the minimum capacity value of the structure belonging to the process section of each production line and less than or equal to the maximum capacity value of the structure belonging to the process section of each production line.

[0086] Based on the evaluation function, several of the preferred water inlet allocation schemes are evaluated to obtain an evaluation value of each of the preferred water inlet allocation schemes.

[0087] The evaluation function is as follows:

[0088] Evaluation value = absolute value of the difference between the real-time load rates of each production line + difference between the maximum real-time load rate and the minimum real-time load rate + k1 × production line adjustment number.

[0089] Where: k1 is the weight coefficient of the production line adjustment number.

[0090] The preferred water inlet allocation scheme corresponding to the lowest evaluation value is selected as the final water inlet allocation scheme.

[0091] The target water inflow of each production line is obtained based on the final water inflow allocation plan.

[0092] The present invention can automatically analyze the water supply required by the water plant based on the target scheduling pressure of the water plant; at the same time, by evaluating the capacity and load of the water plant and fully considering the storage capacity of the reservoir and the production capacity of each production line of the water plant, the total water intake required by the water plant and the water volume of each production line are automatically calculated, so as to achieve balanced water distribution between water supply and water production and balanced water distribution among the production lines of the water plant, so as to achieve the purpose of fully automatic scheduling, improve the automation and intelligent level of the water plant, and ensure the safe, efficient and stable operation of the water plant.

[0093] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0094] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for automatic water balance scheduling in a waterworks, characterized in that: include: The target water supply of the water plant is obtained based on the target dispatching pressure, real-time water supply and real-time water supply pressure of the water plant; Based on the design capacity, real-time equipment status and real-time operation status of each process section, the real-time production capacity, real-time load rate and real-time adjustable capacity of each process section are obtained; Based on the real-time production capacity, real-time load rate and real-time adjustable capacity of each process section, the short board principle is adopted to obtain the real-time production capacity, real-time load rate and real-time adjustable capacity of each production line and water plant; Based on the target water supply and water allocation mode of the water plant, the target water inflow of the water plant is obtained; The target water inflow of each production line is obtained based on the target water inflow of the water plant, the real-time production capacity of each production line, the real-time load rate and the real-time adjustable capacity, specifically: The target water inflow of the water plant is determined. If the difference between the target water inflow of the water plant and the real-time water inflow is within the set water volume threshold, the real-time water inflow of each production line is used as the target water inflow of each production line; If the difference between the target water inflow of the water plant and the real-time water inflow is not within the set water volume threshold range, then based on the target water inflow of the water plant and the real-time production capacity, real-time load rate and real-time adjustable capacity of each production line, the principle of adjusting the load balance of the production line is adopted, and the number of production line adjustments is gradually increased to obtain several initial water inflow allocation plans, wherein the initial water inflow allocation plans include the adjusted target water inflow of each production line; Taking the water inflow of each production line as a constraint condition within the production capacity threshold range, a plurality of the initial water inflow allocation schemes are screened to obtain a plurality of preferred water inflow allocation schemes; Evaluate a plurality of the preferred water inlet allocation schemes based on an evaluation function to obtain an evaluation value of each of the preferred water inlet allocation schemes; the evaluation function is based on a production line load difference and a production line adjustment number; Selecting the preferred water inflow allocation scheme corresponding to the lowest evaluation value as the final water inflow allocation scheme; Obtaining a target water inflow for each production line based on the final water inflow allocation plan; The target water supply of the water plant is obtained based on the target dispatching pressure, real-time water supply and real-time water supply pressure of the water plant, specifically: Establishing a water supply analysis model; inputting the target dispatching pressure, real-time water supply and real-time water supply pressure of the water plant into the water supply analysis model to obtain the target water supply of the water plant; Based on the historical data set, the mapping relationship between water supply pressure and water supply volume is obtained; Based on the mapping relationship, the water supply analysis model is obtained by using a fuzzy control method.

2. The water balance automatic scheduling method of a waterworks according to claim 1, characterized in that: The real-time production capacity, real-time load rate and real-time adjustable capacity of each process section are obtained based on the design capacity, real-time equipment status and real-time operation status of each process section, including: The real-time production capacity of each process section is obtained based on the design capacity, real-time equipment status and real-time operation status of each process section; The real-time load rate of each process section is obtained by dividing the real-time water supply of each process section by the real-time production capacity; The real-time adjustable capacity of each process section is obtained by subtracting the real-time water supply from the real-time production capacity of each process section.

3. The water balance automatic scheduling method of a waterworks according to claim 1, characterized in that: Based on the real-time production capacity, real-time load rate and real-time adjustable capacity of each process section, the short board principle is adopted to obtain the real-time production capacity, real-time load rate and real-time adjustable capacity of each production line and water plant, which are specifically: For each production line, the minimum value of the real-time production capacity of each process section to which it belongs is taken to obtain the real-time production capacity of each production line; For each production line, the maximum value of the real-time load rates of each process section to which it belongs is taken to obtain the real-time load rate of each production line; For each production line, the minimum value of the real-time adjustable capacity of each process section to which it belongs is taken to obtain the real-time adjustable capacity of each production line; The real-time production capacity of the water plant is the sum of the real-time production capacities of each production line; The real-time load rate of a water plant is the ratio of the sum of the real-time water supply of each production line to the real-time production capacity of the water plant; The real-time adjustable capacity of a water plant is the real-time production capacity of the water plant minus the sum of the real-time water supply of each production line.

4. The water balance automatic scheduling method of a waterworks according to claim 1, characterized in that: Based on the water supply and production balance model, the target water inflow of the water plant is obtained; The water supply and water production balance model is as follows: ； Where: is the target water inflow of the water plant, in m 3 / h; k is the water loss coefficient of each process section; is the target water supply of the water plant, in m 3 / h; S is the reservoir bottom area, in m 3 ; H is the target liquid level of the reservoir, in m; h is the current liquid level of the reservoir, in m; The water consumption of the water plant itself, in m 3 / h.

5. The method for automatic water balance scheduling of a waterworks according to claim 4, characterized in that: The target water supply and water distribution mode of the water plant are used to obtain the target water inflow of the water plant, which is specifically: The water distribution mode includes an energy efficiency mode and a steady state mode; When the energy efficiency mode is selected, the target liquid level of the reservoir is given based on the principle of energy saving, and the target liquid level of the reservoir and the target water supply of the water plant are substituted into the water supply and water production balance model to obtain the target water inflow of the water plant; When the steady-state mode is selected, the predicted reservoir liquid level after a set time length is obtained based on the water plant's target water supply, real-time water inflow and current reservoir liquid level; if the predicted reservoir liquid level is greater than or equal to the reservoir's minimum liquid level and less than or equal to the reservoir's maximum liquid level, the water plant's real-time water inflow is used as the water plant's target water inflow; if the predicted reservoir liquid level is less than the reservoir's minimum liquid level or the predicted reservoir liquid level is greater than the reservoir's maximum liquid level, a calculation is performed based on the reservoir's minimum liquid level and the reservoir's maximum liquid level to obtain the reservoir's target liquid level, and the reservoir's target liquid level and the water plant's target water supply are substituted into the water supply and water production balance model to obtain the water plant's target water inflow.

6. The method for automatic water balance scheduling of a waterworks according to claim 5, characterized in that: The target liquid level of the reservoir is obtained by calculation based on the minimum liquid level of the reservoir and the maximum liquid level of the reservoir. The calculation formula is as follows: ； Where: H L is the minimum liquid level of the reservoir, H H The maximum liquid level of the reservoir.

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