Gate opening conversion method under flow scheduling condition

Abstract

The invention discloses a gate opening conversion method under a flow scheduling condition, and the method comprises the steps: determining an initial gate opening, and calculating a scheduling gate opening corresponding to a target scheduling flow; according to the relation between the initial gate opening degree and the dispatching gate opening degree, the gate opening degree is linearly changed from the initial gate opening degree to the dispatching gate opening degree according to the set speed; and in each gate adjustment process, recalculating the actual gate passing flow corresponding to the current gate opening, starting a correction mechanism to carry out fine adjustment on the scheduling gate opening according to the relationship between the actual gate passing flow and the target scheduling flow, and repeatedly executing the gate adjustment process until the target scheduling flow is reached. According to the method, the flow scheduling target of a management layer is met, the actual gate adjustment action of a base layer is achieved, the real-time performance of gate passing flow calculation is guaranteed, and the method is better fused with a channel hydrodynamic simulation model.

Description

Technical Field

[0001] The invention belongs to the technical field of gate regulation, and in particular relates to a gate opening conversion method under flow scheduling conditions. Background Art

[0002] In the process of irrigation channel hydrodynamic simulation, gate scheduling is usually given in advance in the form of boundary conditions. At the model calculation level, the gate opening change process (i.e., scheduling process) can be directly applied to the calculation of the gate flow formula, and then coupled with the hydrodynamic simulation model. However, at the irrigation district management level, gate scheduling is more of a flow control order, and then the grassroots adjust the gate opening according to the order and historical experience. The adjustment experience of each gate is different. A simple way to deal with it is to directly use the order as the gate flow and ignore the role of the gate. The premise of this treatment method is that the grassroots will adjust the gate to the gate flow required by the order in a short time, and dynamically correct it when the water level changes in the subsequent period to maintain the gate flow unchanged. From the perspective of long-term average effect, this treatment method will not introduce too much error, especially when the frequency of the order is high and the channel water level change between two orders is small. However, in the case of rapid changes in channel water levels during flood season, the order is not updated in time. The actual flow through the gate is quite different from the previous order flow. The grassroots will not take the initiative to adjust the gate before receiving the new order, which will introduce a large error and affect the accuracy of channel hydrodynamic simulation. Another way to deal with it is to convert the flow order into a specific gate opening order to facilitate model calculation, but the conversion relationship is highly empirical, and it is difficult to obtain basic data and difficult to implement. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the gate opening conversion method under flow scheduling conditions provided by the present invention solves the problem that the existing related scheduling methods are difficult to restore the gate scheduling process in the real scenario in the simulation model.

[0004] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is: a gate opening conversion method under flow scheduling conditions, comprising the following steps:

[0005] Determine the initial gate opening and calculate the dispatch gate opening corresponding to the target dispatch flow;

[0006] According to the relationship between the initial gate opening and the dispatching gate opening, the gate opening is adjusted from the initial gate opening to the dispatching gate opening at a set rate;

[0007] During each gate adjustment process, the actual flow rate corresponding to the current gate opening is recalculated, and based on the relationship between it and the target dispatching flow rate, the correction mechanism is started to fine-tune the dispatching gate opening, and the gate adjustment process is repeated until the target dispatching flow rate is reached.

[0008] Furthermore, the method for calculating the dispatch gate opening corresponding to the target dispatch flow is specifically as follows:

[0009] Let the gate opening e be the total water head H before the gate 上 , and then calculate the maximum gate flow Q under the current conditions max ;

[0010] When the target dispatch flow Q 调 max When the target scheduling flow Q 调 Substitute into the first function and calculate the corresponding dispatch gate opening e 调 ;

[0011] When the target dispatch flow Q 调 ≥Q max When the gate opening is adjusted, 调 Set to the total water head H before the gate 上 ;

[0012] Among them, the first function is a gate opening calculation function with the flow rate passing through the gate as the scheduling variable.

[0013] Furthermore, the first function is:

[0014] e=f e (H 上 ,H 下 ,Q)

[0015] In the formula, e represents the gate opening, H 上 and H 下 They represent the total water head before the gate and the total water head after the gate, which are obtained through the channel hydrodynamic simulation model or boundary conditions, Q represents the flow through the gate, and f e (.) represents the functional relationship between the flow rate through the gate and the gate opening.

[0016] The beneficial effect of the above further scheme is that the above method abstracts the complex logical relationship for calculating the gate opening into a functional relationship without limiting a specific calculation formula, thereby ensuring the flexibility of formula selection.

[0017] Furthermore, the gate opening is linearly adjusted from the initial gate opening to the scheduled gate opening at a set rate, and the gate adjustment time t corresponding to the gate opening is:

[0018] t=|e 调 -e0| / α

[0019] In the formula, e 调 represents the scheduling gate opening, e0 represents the initial gate opening, and α represents the set rate.

[0020] ​The beneficial effect of the above further scheme is that the above method enables the gate adjustment action to simulate the real action of the gate lift, ensuring the rationality of the gate opening adjustment, while avoiding the oscillation effect caused by the sudden change of the gate opening on the channel hydrodynamic process.

[0021] Furthermore, in each gate adjustment process, the actual gate flow corresponding to the current gate opening is recalculated, and according to the relationship between the actual gate flow and the target dispatching flow, the correction mechanism is started to fine-tune the gate opening. The specific method is as follows:

[0022] After each gate adjustment is completed, the gate opening is substituted into the second function to calculate the corresponding actual gate flow Q' 调 , when the actual flow rate Q' 调 With the target scheduling flow Q 调 When the difference exceeds the set threshold, the correction mechanism is activated to fine-tune the gate opening;

[0023] The second function is a gate flow calculation function with the gate opening as a scheduling variable, and the second function and the first function can be converted into each other.

[0024] Furthermore, the method of starting the correction mechanism to perform a fine adjustment of the gate opening is specifically as follows:

[0025] Substitute the latest total water head before the gate, the total water head after the gate and the target dispatching flow into the first function, calculate the latest dispatching gate opening, and perform the next gate adjustment action based on it.

[0026] The beneficial effect of the above further scheme is: the above method enables the gate opening fine-tuning action to simulate the actual operation of the management department, which is not only consistent with reality, but also ensures that the final flow rate through the gate is close to the dispatching flow rate, thereby achieving the dispatching purpose.

[0027] Furthermore, the constraint conditions of the correction mechanism include a gate adjustment waiting time constraint and a fine-tuning completion time constraint;

[0028] Among them, the gate adjustment completion waiting time constraint is: after each gate adjustment is completed, wait until the flow state is relatively stable before determining whether to start the correction mechanism;

[0029] The fine-tuning completion time constraint is: after the correction mechanism is started, the fine-tuning of the dispatching gate opening is completed within the set time.

[0030] The beneficial effect of the above further scheme is: in the above further scheme, the constraints of the correction mechanism are set to simulate the actual operation performed by the grassroots after receiving the dispatching order. First, the target gate opening is estimated according to the current water conditions, and the gate adjustment action is started. After one adjustment, the water condition changes are observed. If there is a large difference with the dispatching order, a second fine-tuning is performed. After repeated several times, the gate opening is kept unchanged until a new dispatching order is received.

[0031] The beneficial effects of the present invention are:

[0032] (1) The present invention provides a gate scheduling method, which ensures the real-time dynamic change of the flow rate through the gate through the calculation of the gate opening. It is also combined with the flow adjustment order of the management level to fit the actual production, simplify the model input, and better restore the gate scheduling process in the real scene, which can be better integrated with the channel hydrodynamic simulation model.

[0033] (2) During the implementation of the method of the present invention, the gate flow adjustment command in the production management is converted into a specific gate opening adjustment action, which not only meets the needs of the management level, but also satisfies the gate opening requirements of the gate flow calculation.

[0034] (3) During the implementation of the method of the present invention, the working process of the gate lift is taken into consideration, so that the gate opening adjustment is more realistic and reasonable, and the disturbance of the channel hydrodynamic simulation caused by the sudden change of the gate opening is avoided.

[0035] (4) The method of the present invention takes into account the fine-tuning of the gate according to the water flow dynamics in production practice, so that the gate opening adjustment is more reasonable, the final flow through the gate is closer to the dispatching flow, and the subsequent channel hydrodynamic simulation error is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a flow chart of the gate opening conversion method under flow scheduling conditions provided by the present invention. DETAILED DESCRIPTION

[0037] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0038] The embodiment of the present invention provides a gate opening conversion method under flow scheduling conditions, such as Figure 1 As shown, the following steps are included:

[0039] Determine the initial gate opening and calculate the dispatch gate opening corresponding to the target dispatch flow;

[0040] According to the relationship between the initial gate opening and the dispatching gate opening, the gate opening is adjusted from the initial gate opening to the dispatching gate opening at a set rate;

[0041] In each gate adjustment process, recalculate the actual flow rate through the gate corresponding to the current gate opening, and based on the relationship between it and the target scheduling flow rate, start the correction mechanism to finely adjust the gate opening of the scheduling, and repeat the gate adjustment process until the target scheduling flow rate is reached.

[0042] In the embodiment of the present invention, for any gate, the basic parameters are fixed. For a given target scheduling flow rate, the method for calculating the corresponding scheduling gate opening in this embodiment is specifically as follows:

[0043] Let the gate opening e be the total head H in front of the gate 上 , and then calculate the maximum flow rate Q through the gate under the current conditions max ;

[0044] When the target scheduling flow rate Q 调 < Q max , substitute the target scheduling flow rate Q 调 into the first function to calculate the corresponding scheduling gate opening e 调 ;

[0045] When the target scheduling flow rate Q 调 ≥ Q max , then set the scheduling gate opening e 调 to the total head H in front of the gate 上 ;

[0046] Among them, the first function is a gate opening calculation function with the flow rate through the gate as the scheduling variable, and its expression is:

[0047] e = f e (H 上 , H 下 , Q)

[0048] In the formula, e represents the gate opening, H 上 and H 下 respectively represent the total head in front of the gate and the total head behind the gate, which are obtained through the channel hydrodynamic simulation model or boundary conditions, Q represents the flow rate through the gate, and f e (.) represents the functional relationship between the flow rate through the gate and the gate opening.

[0049] In this embodiment, when the target scheduling flow rate Q adjustment < Q max, it means that the target scheduling flow rate is within the gate flow capacity range, and subsequent gate opening adjustments can be made; when the target scheduling flow rate Q adjustment ≥ Q max, it means that the target scheduling flow rate exceeds the gate flow capacity range, and directly take e 调 = H 上 , and make the gate fully open.

[0050] In the embodiment of the present invention, when the gate control is performed according to the relationship between the initial gate opening and the dispatching gate opening, taking into account the working principle of the gate lifting motor, the gate opening is linearly adjusted from the initial gate opening to the dispatching gate opening at a set rate, and the corresponding gate adjustment time t is:

[0051] t=|e 调 -e0| / α

[0052] In the formula, e 调 represents the scheduling gate opening, e0 represents the initial gate opening, and α represents the set rate.

[0053] During the above-mentioned gate adjustment process, the hydrodynamic conditions will also change with time. Therefore, the calculation of the flow rate through the gate at each step is performed using real-time information before and after the gate and the current gate opening.

[0054] Specifically, in the embodiment of the present invention, due to the change of the hydrodynamic conditions before and after the gate caused by the gate adjustment action, in each gate adjustment process, the actual gate flow corresponding to the current gate opening is recalculated, and according to the relationship between the actual gate opening and the target dispatching flow, the correction mechanism is started to fine-tune the gate opening. Specifically, the method is as follows:

[0055] After each gate adjustment is completed, the gate opening is substituted into the second function to calculate the corresponding actual gate flow Q' 调 , when the actual flow rate Q' 调 With the target scheduling flow Q 调 When the difference exceeds the set threshold, the correction mechanism is activated to fine-tune the gate opening;

[0056] The second function is a gate flow calculation function with the gate opening as the dispatching variable. The second function and the first function can be transformed into each other, that is, the second function can be expressed as:

[0057] Q=f Q (H 上 ,H 下 ,e)

[0058] In the above process, when the difference between the actual gate flow rate Q'adjustment and the target dispatching flow rate Qadjustment exceeds the set threshold, it means that the gate adjustment does not meet the adjustment order requirements, and it is necessary to start the correction mechanism for fine-tuning. Specifically, in this embodiment, the method of starting the correction mechanism to fine-tune the gate opening is as follows:

[0059] Substitute the latest total water head before the gate, the total water head after the gate and the target dispatching flow into the first function, calculate the latest dispatching gate opening, and perform the next gate adjustment action based on it.

[0060] In this embodiment, gate correction and fine-tuning are subject to certain conditional restrictions. Specifically, the constraint conditions of the correction mechanism include gate adjustment waiting time constraint and fine-tuning completion time constraint;

[0061] Among them, the waiting time constraint for gate adjustment is: after each gate adjustment is completed, wait until the flow state is relatively stable before determining whether to start the correction mechanism;

[0062] The time constraint for completing fine-tuning is: after starting the correction mechanism, the fine-tuning of the dispatching gate opening must be completed within the set time.

[0063] For example, for the waiting time constraint for gate adjustment, it is necessary to wait for a period of time (such as 5 minutes) after each adjustment of the gate opening to allow the flow state to be relatively stable, and then determine whether the flow rate through the gate meets the requirements of the adjustment order; for the time constraint for fine-tuning, the fine-tuning action must be completed within a period of time (such as 30 minutes) after receiving the adjustment order. If the time constraint is exceeded, the fine-tuning action will be stopped and wait for the next adjustment order.

[0064] The above-mentioned constraints set in this embodiment simulate the actual operations performed by the grassroots after receiving the dispatching order. First, the target gate opening is estimated according to the current water conditions, and the gate adjustment action is started. After one adjustment, the water condition changes are observed. If there is a large difference with the dispatching order, a second fine-tuning is performed. After repeated several times, the gate opening is kept unchanged until a new dispatching order is received.

[0065] In the present invention, the process of gate opening scheduling corresponding to a target scheduling flow can be completed by the above method, which not only meets the flow scheduling target of the management level, but also realizes the actual gate adjustment action at the grassroots level, and also ensures the real-time calculation of the flow through the gate, and better integrates with the channel hydrodynamic simulation model.

[0066] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. 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 a limitation on the present invention.

[0067] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A gate opening conversion method under flow scheduling conditions, characterized in that: The following steps are involved: Determine the initial gate opening and calculate the dispatch gate opening corresponding to the target dispatch flow; According to the relationship between the initial gate opening and the dispatching gate opening, the gate opening is adjusted from the initial gate opening to the dispatching gate opening at a set rate; During each gate adjustment process, the actual flow rate corresponding to the current gate opening is recalculated, and based on the relationship between it and the target dispatching flow rate, the correction mechanism is started to fine-tune the dispatching gate opening, and the gate adjustment process is repeated until the target dispatching flow rate is reached.

2. The gate opening conversion method under flow scheduling conditions according to claim 1 is characterized in that: The specific method for calculating the dispatch gate opening corresponding to the target dispatch flow is: Let gate opening e be the total water head H before the gate 上 , and then calculate the maximum gate flow Q under the current conditions max ; When the target dispatch flow Q 调 max When the target scheduling flow Q 调 Substitute into the first function and calculate the corresponding dispatch gate opening e 调 ;​ When the target dispatch flow Q 调 ≥Q max When the gate opening is adjusted, 调 Set to the total water head H before the gate 上 ; The first function is a gate opening calculation function with the gate flow rate as the scheduling variable.

3. The gate opening conversion method under flow scheduling conditions according to claim 2 is characterized in that: The first function is: e=f e (H 上 ,H 下 ,Q) In the formula, e represents the gate opening, H 上 and H 下 They represent the total water head before the gate and the total water head after the gate, which are obtained through the channel hydrodynamic simulation model or boundary conditions, Q represents the flow through the gate, and f e (.) represents the functional relationship between the flow rate through the gate and the gate opening.

4. The gate opening conversion method under flow scheduling conditions according to claim 1 is characterized in that: The gate opening is adjusted linearly from the initial gate opening to the scheduled gate opening at the set rate. The corresponding gate adjustment time t is: t=|e 调 -e0| / α In the formula, e 调 represents the scheduling gate opening, e0 represents the initial gate opening, and α represents the set rate.

5. The gate opening conversion method under flow scheduling conditions according to claim 3 is characterized in that: In each gate adjustment process, the actual gate flow corresponding to the current gate opening is recalculated, and based on the relationship between the actual gate flow and the target dispatching flow, the correction mechanism is started to fine-tune the gate opening. The specific method is as follows: After each gate adjustment is completed, the gate opening is substituted into the second function to calculate the corresponding actual gate flow Q' 调 , when the actual flow rate Q' 调 With the target scheduling flow Q 调 When the difference exceeds the set threshold, the correction mechanism is activated to fine-tune the gate opening; The second function is a gate flow calculation function with the gate opening as a scheduling variable, and the second function and the first function can be converted into each other.

6. The gate opening conversion method under flow scheduling conditions according to claim 3 is characterized in that: The method of starting the correction mechanism to perform a fine adjustment of the gate opening is specifically as follows: Substitute the latest total water head before the gate, the total water head after the gate and the target dispatching flow into the first function, calculate the latest dispatching gate opening, and perform the next gate adjustment action based on it.

7. The gate opening conversion method under flow scheduling conditions according to claim 1 is characterized in that: The constraint conditions of the correction mechanism include the gate adjustment waiting time constraint and the fine-tuning completion time constraint; Among them, the gate adjustment completion waiting time constraint is: after each gate adjustment is completed, wait until the flow state is relatively stable before determining whether to start the correction mechanism; The fine-tuning completion time constraint is: after the correction mechanism is started, the fine-tuning of the dispatching gate opening is completed within the set time.

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