Method for determining daily power generation plan of hydropower station unit in runoff mode, and system

Abstract

The present application discloses a method for determining a daily power generation plan of a hydropower station unit in a runoff mode, and a system. By acquiring parameters such as an inflow, a reservoir water level, a unit power discharge, and a flood discharge, a generator terminal output load value of each unit when meeting a current water regime is determined to provide a scientific basis for determining a power generation plan of a hydropower station in a runoff mode; and optionally, on the basis of operation characteristics of the hydropower station in the runoff mode, the power generation plan is formulated in real time by using a generator net head and a required unit power discharge, so that the determination and adjustment of a daily power generation plan of a hydropower station unit are achieved. Therefore, by implementing the present application, the daily power generation plan can be reasonably and effectively formulated.

Description

A method and system for determining daily power generation plan of hydropower station units under runoff mode Technical Field

[0001] The present application relates to the technical field of power generation control and reservoir management, and specifically to a method and system for determining a daily power generation plan for a hydropower station unit under a runoff mode. Background Art

[0002] A hydropower station under the runoff mode is an operating mode of a hydropower station that uses the runoff of water from the reservoir to generate electricity. For a hydropower station under the runoff mode, it is unable to adjust the inflow flow. Therefore, it is often in an operating mode of generating as much electricity as the inflow. If the power generation flow is less than the inflow flow, the inflow flow will overflow, resulting in a waste of water resources. If the power generation flow is greater than the inflow flow, the reservoir water level will be lowered, affecting the power generation head and efficiency. Therefore, for a hydropower station under the runoff mode, it is important to reasonably determine its power generation plan for the operation of the power station.

[0003] Summary of the Invention

[0004] In view of this, an embodiment of the present application provides a method and system for determining a daily power generation plan of a hydropower station unit under a runoff mode, so as to solve the technical problem of unreasonable power generation plan of a hydropower station under a runoff mode in the prior art.

[0005] The technical solutions proposed in this application are as follows:

[0006] In the first aspect, an embodiment of the present application provides a method for determining a daily power generation plan of a hydropower station unit under a runoff mode, and the method for determining a daily power generation plan of a hydropower station unit under a runoff mode includes: obtaining the inflow flow of each hydropower station unit in the hydropower station under the runoff mode and the reservoir water level of the reservoir in the hydropower station, and determining the unit power generation flow and flood discharge flow based on the inflow flow; based on the reservoir water level, the unit power generation flow and the flood discharge flow, after a preset processing method, determining the net water head of each hydropower station unit; based on the net water head and the unit power generation flow, after a characteristic curve of each hydropower station unit, determining the comprehensive operating efficiency of each hydropower station unit; based on the net water head, the unit power generation flow and the comprehensive operating efficiency, determining the machine-end output load value of each hydropower station unit; and determining the daily power generation plan of the hydropower station unit under the runoff mode based on the machine-end output load value of each hydropower station unit.

[0007] In combination with the first aspect, in a possible implementation of the first aspect, based on the reservoir water level, the unit power generation flow and the flood discharge flow, a preset processing method is used to determine the net water head of each hydropower station unit, including: based on the unit power generation flow and the flood discharge flow, a preset first relationship is used to obtain the tail water level of the hydropower station, and the preset first relationship reflects the relationship between the tail water level and the outflow flow of the hydropower station; based on the reservoir water level, the unit power generation flow and the tail water level, a preset processing method is used to obtain the net water head of each hydropower station unit.

[0008] In combination with the first aspect, in another possible implementation of the first aspect, based on the reservoir water level, the power generation flow of the unit and the tail water level, a preset processing method is used to obtain the net head of each hydropower station unit, including: determining the gross head of the hydropower station based on the reservoir water level and the tail water level; obtaining the head loss of each hydropower station unit based on the power generation flow of the unit through the preset processing method; and determining the net head of each hydropower station unit based on the gross head and the head loss.

[0009] In combination with the first aspect, in another possible implementation of the first aspect, based on the net water head and the power generation flow of the unit, the comprehensive operating efficiency of each hydropower station unit is determined through the characteristic curve of each hydropower station unit, including: obtaining the impeller diameter and rated speed of each hydropower station unit; based on the net water head, the power generation flow of the unit, the impeller diameter and the rated speed, determining the unit flow and unit speed of each hydropower station unit; based on the unit flow and unit speed, determining the comprehensive operating efficiency of each hydropower station unit through the characteristic curve.

[0010] In combination with the first aspect, in another possible implementation of the first aspect, the method further includes: obtaining a forecasted inflow flow; comparing the inflow flow with the forecasted inflow flow; when the inflow flow is greater than the forecasted inflow flow, load adjusting the inflow flow at a preset time node.

[0011] In combination with the first aspect, in another possible implementation of the first aspect, the inflow flow is load adjusted at a preset time node, including: obtaining the power station load pattern of the hydropower station; judging whether the power station load pattern is subject to the grid power generation instruction; when the power station load pattern is subject to the grid power generation instruction, sending the hydropower station unit daily power generation plan modification instruction to the dispatching terminal at the preset time node, and based on the hydropower station unit daily power generation plan modification instruction, load adjusting the inflow flow, the dispatching terminal is connected to the hydropower station; when the power station load pattern is not subject to the grid power generation instruction, load adjusting the inflow flow according to the preset time interval of the hydropower station.

[0012] In combination with the first aspect, in another possible implementation of the first aspect, the method further includes: based on preset requirements, determining a gate operation mode corresponding to the flood discharge facilities in the hydropower station under the runoff mode; based on the reservoir water level, obtaining a gate opening value corresponding to the flood discharge flow through processing with a preset second relationship, the preset second relationship expressing a functional relationship between the flood discharge flow, the reservoir water level, and the gate opening; under the gate operation mode, controlling the reservoir water level to meet a preset safety range based on the gate opening value.

[0013] In the second aspect, an embodiment of the present application provides a system for determining the daily power generation plan of a hydropower station unit and a reservoir water level control system under a runoff mode, which is used to execute the method for determining the daily power generation plan of a hydropower station unit under a runoff mode as described in the first aspect and any one of the first aspects of the embodiment of the present application; the system for determining the daily power generation plan of a hydropower station unit and a reservoir water level control system under a runoff mode includes: an acquisition unit for acquiring a parameter set of a hydropower station under a runoff mode, and sending the parameter set of the hydropower station to a processing unit and a control unit; the processing unit is used to determine the machine-end output load value of each of the hydropower station units based on the hydropower station parameter set, and send the machine-end output load value of each of the hydropower station units to the determination unit; the determination unit is used to determine the daily power generation plan of the hydropower station unit under the runoff mode based on the machine-end output load value of each of the hydropower station units; the control unit is used to control the reservoir water level corresponding to the reservoir in the hydropower station to meet a preset safety range based on the parameter set of the hydropower station and a preset control method.

[0014] In a third aspect, an embodiment of the present application provides a device for determining a daily power generation plan for a hydropower station unit under a runoff mode, the device comprising: an acquisition and determination module for acquiring the inflow flow of each hydropower station unit in the hydropower station under the runoff mode and the reservoir water level of the reservoir in the hydropower station, and determining the unit power generation flow and flood discharge flow based on the inflow flow; a first determination module for determining the net head of each hydropower station unit based on the reservoir water level, the unit power generation flow and the flood discharge flow through a preset processing method; a second determination module for determining the comprehensive operating efficiency of each hydropower station unit based on the net head and the unit power generation flow through the characteristic curve of each hydropower station unit; a third determination module for determining the machine-end output load value of each hydropower station unit based on the net head, the unit power generation flow and the comprehensive operating efficiency; a fourth determination module for determining the daily power generation plan of the hydropower station unit under the runoff mode based on the machine-end output load value of each hydropower station unit.

[0015] In a fourth aspect, an embodiment of the present application provides an electronic device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing a computer program, and the processor executing the computer program to execute the method for determining the daily power generation plan of a hydropower station unit under the runoff mode as described in the first aspect and any one of the first aspects of the embodiment of the present application.

[0016] In the fifth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program is used to enable the computer to execute the method for determining the daily power generation plan of a hydropower station unit under the runoff mode as described in the first aspect and any one of the first aspects of the embodiment of the present application.

[0017] The technical solution provided by this application has the following effects:

[0018] The method for determining the daily power generation plan of a hydropower station unit under the runoff mode provided in the embodiment of the present application obtains parameters such as the inflow, reservoir water level, unit power generation flow, and flood discharge flow, thereby determining the output load value of each unit that conforms to the current water conditions, providing a scientific basis for determining the power generation plan of the hydropower station under the runoff mode; optionally, based on the operating characteristics of the hydropower station under the runoff mode, the net head of the generator and the required unit power generation flow are used to formulate the power generation plan in real time, thereby realizing the determination and adjustment of the daily power generation plan of the hydropower station unit. Therefore, by implementing this application, a daily power generation plan can be formulated reasonably and effectively.

[0019] The embodiment of the present application provides a system for determining the daily power generation plan of the hydropower station units and a reservoir water level control system under the runoff mode, which realizes the determination of the daily power generation plan of the hydropower station units and, at the same time, can control the reservoir water level within the range of safety requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] FIG1 is a flow chart of a method for determining a daily power generation plan of a hydropower station unit under a runoff mode according to an embodiment of the present application;

[0022] FIG2 is a diagram showing the relationship between the tailwater level and the outflow flow rate according to an embodiment of the present application;

[0023] 3 is a structural block diagram of a daily power generation plan determination and reservoir water level control system for a hydropower station unit in a runoff mode according to an embodiment of the present application;

[0024] 4 is a control flow chart of a calculation system for daily power generation planning and reservoir water level control of a model hydropower station unit under runoff mode according to an embodiment of the present application;

[0025] FIG5 is a structural block diagram of a device for determining a daily power generation plan of a hydropower station unit under a runoff mode according to an embodiment of the present application;

[0026] FIG6 is a schematic diagram of the structure of a computer-readable storage medium provided according to an embodiment of the present application;

[0027] FIG7 is a schematic structural diagram of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] The present application provides a method for determining a daily power generation plan for a hydropower station unit under a runoff mode, as shown in FIG1 , including the following steps:

[0031] Step 101: Obtain the inflow flow of each hydropower unit in the hydropower station under the runoff mode and the reservoir water level of the reservoir in the hydropower station, and determine the unit power generation flow and flood discharge flow based on the inflow flow.

[0032] Specifically, the inflow Q can be collected using an inflow acquisition device installed upstream of the reservoir. This inflow acquisition device can be a flow meter or a water level meter. If it is a water level meter, the flow rate needs to be converted using the water level meter to obtain the inflow Q of the hydropower station under the runoff mode.

[0033] When obtaining the reservoir water level H, it can be obtained by installing a water level sensor.

[0034] Optionally, in the embodiment of the present application, in order to improve the accuracy of the obtained inflow Q, first, when the reservoir water level fluctuates, the average value of the reservoir water level within the calculation period can be taken as the reservoir water level obtained in the embodiment of the present application. Secondly, since the calculation of water level, output, head, and efficiency will still produce certain errors, when calculating the inflow by the reservoir water level, there will be problems of water level fluctuation and result lag. Therefore, in the embodiment of the present application, a flow meter is installed upstream of the reservoir at the same time. By comparing and analyzing the water level change rate and the data obtained by the inflow flow meter, the two complement each other and obtain the final inflow Q, which is convenient for providing detailed data support for the subsequent hydropower station power generation plan and gate control.

[0035] Then, according to the reservoir operation characteristics under the runoff mode, the outflow and inflow should be balanced. When all the outflow flows through the hydropower station units, the unit power generation flow q should be equal to Q; when the inflow during the flood season is greater than the unit's maximum power generation flow, the unit power generation flow is the power generation flow q at the maximum rated output. maxThe remaining flow is controlled by opening and closing the gates of the flood discharge facilities. At this time, the flood discharge X=Qq max .

[0036] Step 102: Based on the reservoir water level, the power generation flow of the unit and the flood discharge flow, the net water head of each unit of the hydropower station is determined through a preset processing method.

[0037] Specifically, the unit overflow q(i) can be obtained through the unit power generation flow q. Optionally, the net water head h of each hydropower station unit can be obtained by combining the unit overflow q(i), the reservoir water level H and the flood discharge flow X. 净水头 .

[0038] Step 103: Based on the net water head and the power generation flow of the unit, the comprehensive operating efficiency of each hydropower station unit is determined through the characteristic curve of each hydropower station unit.

[0039] The characteristic curve of the hydropower station unit may be a comprehensive characteristic curve or an operating characteristic curve.

[0040] Optionally, based on the characteristic curve and in combination with the net water head and power generation flow of the hydropower station unit, the comprehensive operating efficiency of the hydropower station unit η=η 水轮机 *η 发电机 Among them, turbine and generator represent two different hydropower station units.

[0041] Specifically, when determining the unit operating efficiency through the unit comprehensive characteristic curve or operation characteristic curve, due to the different number of operating generators, the outflow rate changes accordingly, and the change in the downstream tailwater level causes the unit net water head to change synchronously. Therefore, the efficiency change relationship curves under different generator operation combinations are drawn on the turbine characteristic curve in turn to determine the generator efficiency under different operating modes.

[0042] Optionally, when determining the comprehensive operating efficiency of a hydropower station unit based on a comprehensive characteristic curve or operating characteristic curve, since the parameters in the comprehensive characteristic curve or operating characteristic curve are generally designed model parameters, they are affected by factors such as manufacturing, installation, and actual operating conditions, resulting in certain differences in the unit's efficiency, flow rate, and head relationship curve. Therefore, in the embodiments of the present application, it is necessary to accumulate operating data and revise the relationship between the unit's operating efficiency and head and flow rate.

[0043] Step 104: Determine the terminal output load value of each unit of the hydropower station based on the net water head, the power generation flow of the unit and the comprehensive operation efficiency.

[0044] Specifically, the following relationship (1) is used to calculate the output load value P of each hydropower station unit:

[0045] P=9.81*h 净水头 *q*η (1)

[0046] Step 105: Determine a daily power generation plan of the hydropower station unit under the runoff mode based on the terminal output load value of each hydropower station unit.

[0047] Specifically, the terminal output load value P of each hydropower station unit is used to control the power generation of each hydropower station unit in the runoff mode. Therefore, the terminal output load value P of each hydropower station unit can be used to determine the daily power generation plan of the hydropower station unit in the runoff mode.

[0048] Optionally, in the process of determining the daily power generation plan of the hydropower station unit, if Q is greater than q, the unit output, that is, the unit end output load value P, is increased until the total power generation flow q is equal to the incoming flow Q; if Q is less than q, the unit output is reduced until the total power generation flow q is equal to the incoming flow Q, thereby achieving a match between the incoming flow and the active output of the power station, and ensuring the balance of the reservoir water level under the runoff mode.

[0049] The method for determining the daily power generation plan of a hydropower station unit under the runoff mode provided in the embodiment of the present application obtains parameters such as the inflow, reservoir water level, unit power generation flow, and flood discharge flow, thereby determining the output load value of each unit that conforms to the current water conditions, providing a scientific basis for determining the power generation plan of the hydropower station under the runoff mode; optionally, based on the operating characteristics of the hydropower station under the runoff mode, the net head of the generator and the required unit power generation flow are used to formulate the power generation plan in real time, thereby realizing the determination and adjustment of the daily power generation plan of the hydropower station unit. Therefore, by implementing this application, a daily power generation plan can be formulated reasonably and effectively.

[0050] As an optional implementation of an embodiment of the present application, step 102 includes: based on the power generation flow of the unit and the flood discharge flow, obtaining the tail water level of the hydropower station through a preset first relationship processing; based on the reservoir water level, the power generation flow of the unit and the tail water level, obtaining the net water head of each unit of the hydropower station through a preset processing method.

[0051] Among them, the preset first relationship reflects the relationship between the tailwater level and the outflow flow of the hydropower station, as shown in Figure 2. It can be calculated based on the tailwater channel structure, or it can be calibrated based on many years of operation data, or it can be obtained from the design report during the design of the power station. This curve is an important curve for the design and operation of the hydropower station.

[0052] Specifically, the water level-flow relationship using natural river channels is suitable for stable water level-flow relationships with good station control and channel control. The characteristics of this type of water level-flow relationship are mainly manifested in that the station control is good, and the factors affecting the water level-flow relationship change with the water level and remain stable. The water level-flow relationship presents a single curve, or the factors affecting the water level-flow relationship change with the water level, but the influencing factors such as area and average flow rate can compensate each other, so that the water level-flow relationship presents a single line, that is, there is only one flow at the same water level, and it can satisfy the Manning formula shown in the following equations (2) and (3):

[0053] Q=AV (3)

[0054] Where: Q represents the flow rate (m 3 / s); A represents the cross-sectional area (m 2 ); V is the average flow velocity of the section (m / s); n is the riverbed roughness, dimensionless; R is the hydraulic radius (m); S is the water surface gradient.

[0055] The roughness value is calibrated by measuring the water surface elevation and investigating the historical flood water surface line; the water surface line at various flow levels on the original river channel topography is calculated and compared with the natural water level-flow relationship curve of the tailwater section of the dam site powerhouse to ensure that the calculation model and parameter values ​​used are reasonable.

[0056] When the power station is operating normally, the tailwater water value and outflow flow data measured by the water level meter are used to generate a curve chart of the actual flow and water level relationship. A new relationship calculation formula can be fitted through a polynomial relationship, and by analyzing and comparing it with the natural river water level and flow relationship curve in the design phase, deviation value analysis and data correction can be made. It can also provide a reference for later river changes and their impact on power generation efficiency.

[0057] Optionally, the reservoir water level can generally remain stable under the runoff mode, so the head of the power station unit is often greatly affected by the tailwater level. The tailwater flow relationship of the hydropower station is often only given in the engineering design of the original river channel before the construction of the project. The river channel conditions change after the project is completed. At the same time, the flood discharge during the flood season (discarded water flow) has a greater impact on the tailwater level of the power station. Therefore, the relationship between the outflow flow and the tailwater level needs to be re-reviewed and calculated after the project is completed or the operating experience needs to be accumulated. Therefore, in the embodiment of the present application, it is necessary to obtain the real outflow flow and tailwater level relationship curve and model through continuous data recording.

[0058] Specifically, based on the unit power generation flow q and the flood discharge flow X, and according to the relationship between the tailwater level and the outflow flow of the hydropower station, the tailwater level L of the hydropower station can be calculated.

[0059] Optionally, based on the reservoir water level, the power generation flow of the unit and the tail water level, a preset processing method is used to obtain the net head of each hydropower station unit, including: determining the gross head of the hydropower station based on the reservoir water level and the tail water level; obtaining the head loss of each hydropower station unit based on the power generation flow of the unit through the preset processing method; and determining the net head of each hydropower station unit based on the gross head and the head loss.

[0060] First, the gross head h of the hydropower station is calculated using the following relationship (4): 毛水头 :

[0061] h 毛水头 =HL (4)

[0062] Next, according to the description of step 102, the head loss of each hydropower station unit is obtained by using the unit overflow q(i) in combination with the layout of the preset water diversion system.

[0063] Among them, the head loss generally includes the local head loss of the water inlet (water inlet tower) and the trash rack, as well as the loss along the water diversion pressure pipe, which is obtained according to the design documents or the pressure pipe head loss calculation formula.

[0064] Specifically, the head losses at the water inlet, trash rack, gate slot, and penstock are generally calculated and reviewed during the engineering design phase. In actual use, head loss data can be obtained by consulting the relevant design documents. The general calculation formulas for local head losses at the water inlet and trash rack, and for the head loss along the penstock are given below:

[0065] (1) According to the shape of the water inlet, the local head loss Δh of the trash rack, bell mouth, maintenance door slot and working door slot m The following relationship (5) is used for calculation:

[0066] Δh m =ξV 2 / 2g (5)

[0067] Where: ξ represents the local head loss coefficient; g represents the acceleration of gravity, which is 9.81 m / s 2 ; V 2 / 2g represents the average flow velocity head at the location.

[0068] (2) The head loss along the penstock is calculated using the following equations (6) and (7):

[0069] Δh f =LV 2 / C 2 R (6)

[0070] C=R 1 / 6 / n (7)

[0071] Where: L is the calculated length of the waterway (m); C is the Sherman coefficient, calculated using the Manning formula; R is the hydraulic radius (m); n is the roughness value (n = 0.014 for concrete, n = 0.012 for steel pipe, the average roughness value can be used).

[0072] Finally, the net water head h of the hydropower station unit is calculated using the following relationship (8): 净水头 :

[0073] h 净水头 =h 毛水头 -Δh 损失 (8)

[0074] As an optional implementation of an embodiment of the present application, step 103 includes: obtaining the impeller diameter and rated speed of each hydropower station unit; determining the unit flow and unit speed of each hydropower station unit based on the net water head, the unit power generation flow, the impeller diameter and the rated speed; and determining the comprehensive operating efficiency of each hydropower station unit through the characteristic curve based on the unit flow and unit speed.

[0075] Specifically, based on the net water head and power generation flow of each unit, combined with the unit's impeller diameter and rated speed, the unit's unit flow and unit speed are calculated, and then the unit's operating efficiency is determined in the characteristic curve described in step 103 through the unit flow and unit speed.

[0076] As an optional implementation of the embodiment of the present application, the method also includes: obtaining a forecasted inflow flow; comparing the inflow flow with the forecasted inflow flow; when the inflow flow is greater than the forecasted inflow flow, load adjusting the inflow flow at a preset time node.

[0077] Specifically, according to the description of step 101, after the inflow is calculated through the changes in the reservoir water level, the calculated inflow is compared with the predicted inflow. If the inflow or the reservoir water level deviation value exceeds the set value, that is, the predicted inflow, it is necessary to adjust the load at the next time point, that is, the preset time node.

[0078] Optionally, the inflow flow is load-adjusted at a preset time node, including: obtaining the power station load pattern of the hydropower station; judging whether the power station load pattern is subject to the constraints of the power grid power generation instruction; when the power station load pattern is subject to the constraints of the power grid power generation instruction, sending the hydropower station unit daily power generation plan modification instruction to the dispatching terminal at the preset time node, and based on the hydropower station unit daily power generation plan modification instruction, load-adjusting the inflow flow, the dispatching terminal is connected to the hydropower station; when the power station load pattern is not subject to the power grid power generation instruction, load-adjusting the inflow flow according to the preset time interval of the hydropower station.

[0079] Specifically, if the load regulation mode of the power station is constrained by the power generation instructions of the power grid, an application should be submitted to the dispatcher at the corresponding time point to modify the power generation plan, and the load adjustment should be corrected at the next time point; if the load regulation of the power station is not constrained by any constraints, the load can be adjusted in real time according to the changes in the inflow flow and the interval time set by the power station.

[0080] As an optional implementation of an embodiment of the present application, the method also includes: based on preset requirements, determining the gate operation mode corresponding to the flood discharge facilities in the hydropower station under the runoff mode; based on the reservoir water level, obtaining the gate opening value corresponding to the flood discharge flow through a preset second relationship processing; under the gate operation mode, controlling the reservoir water level based on the gate opening value to meet a preset safety range.

[0081] The preset second relational expression represents the functional relationship between the flood discharge flow, the reservoir water level and the gate opening.

[0082] When a reservoir operates in runoff mode, during the flood season (dumping period), if the inflow exceeds the maximum rated power generation flow, all hydropower station units generate power at rated capacity, and the excess inflow must be discharged through the flood discharge facilities. Therefore, in runoff mode, when the inflow Q exceeds the unit power generation flow q, the inflow is constantly changing due to changes in upstream hydrological and meteorological conditions and the peak load regulation of upstream power stations. This requires continuous calculation of the spillway gate opening to determine the appropriate discharge flow, thereby controlling the reservoir water level within the required safety range.

[0083] First, the relevant regulations and requirements for opening the gates can be determined according to the relevant regulations on the operation requirements of the hydraulic structures of the flood discharge facilities, and the gate operation mode can be determined;

[0084] Then, the flow opening relationship function of the flood discharge facility is obtained, as shown in the following equation (9):

[0085] X=f(H,O) (9)

[0086] Optionally, a flood discharge capacity table under different water level elevations can be calculated based on the flow opening relationship function of the flood discharge facility, and then the gate opening values ​​under different flood discharge flows can be obtained by linear interpolation.

[0087] In one embodiment, a relationship table between the flow rate of a flood discharge facility and the water level and opening degree is provided, as shown in Table 1 below:

[0088] Table 1. Relationship between flow, water level and opening of flood discharge facilities

[0089] Based on Table 1 above, a linear interpolation method based on EXCEL formula and VBA programming is provided, as shown below:

[0090] 1. Linear interpolation table formula based on Excel:

[0091] IF(OR(xi>MAX(x),xi<MIN(x),yi> MAX(y),yi <MIN(y)),NA(),IF(AND(xi=MAX(x),yi=MAX(y)),OFFSET(o,MATCH(xi,x),MATCH(yi,y)),IF(xi=MAX(x),FORECAST(yi,OFFSET(o,MATCH(xi,x),MATCH(yi,y),1,2),OFFSET(o,0,MATCH(yi,y),1,2)),IF(yi=MAX(y),FORECAST(xi,OFFSE T(o,MATCH(xi,x),MATCH(yi,y),2,1),OFFSET(o,MATCH(xi,x),0,2,1)),MMULT(MMULT({1,0}+{-1,1}*FORECAST(xi,{0;1},OFFSET(o,MATCH(xi,x),0,2,1)),OFFSET(o,MATCH(xi,x),MATCH(yi,y),2,2)),{1;0}+{-1;1}*FORECAST(yi,{0,1},OFFSET(o,0,MATCH(yi,y),1,2)))))))

[0092] in:

[0093] X: vertical cell conditional range

[0094] Y: horizontal conditional cell range

[0095] 0: X, Y intersection cell

[0096] 2. Linear interpolation formula based on Excel VBA programming

[0097] Function LinearityInterpolation(NodeNum As Long,X()As Single,Y()As Single,MyX As Single)As Single

[0098] Finally, under the gate operation mode, the spillway gate opening is continuously calculated by using the flow opening relationship function of the flood discharge facility to determine the reasonable discharge flow, thereby controlling the reservoir water level within the safety requirement range.

[0099] An embodiment of the present application also provides a system for determining the daily power generation plan of a hydropower station unit and a reservoir water level control system under a runoff mode. As shown in FIG3 , the system 2 for determining the daily power generation plan of a hydropower station unit and a reservoir water level control system under the runoff mode includes: an acquisition unit 21 , a processing unit 22 , a determination unit 23 and a control unit 24 .

[0100] The acquiring unit 21 is connected to the processing unit 22 and the controlling unit 24 respectively; the processing unit 22 is connected to the determining unit 23 .

[0101] Optionally, describe the functions of each device in the system.

[0102] Specifically, the daily power generation plan determination and reservoir water level control system 2 of the hydropower station unit under the runoff mode is used to execute the method for determining the daily power generation plan of the hydropower station unit under the runoff mode as described in the above embodiment of the present application:

[0103] First, the acquisition unit 21 is configured to acquire a hydropower station parameter set in the runoff mode and send the hydropower station parameter set to the processing unit 22 and the control unit 24. The hydropower station parameter set may include the inflow of each hydropower unit in the hydropower station and the reservoir water level of the hydropower station reservoir, as well as the unit power generation flow and flood discharge flow determined based on the inflow.

[0104] The specific acquisition process and determination process refer to the description of step 101 in the method for determining the daily power generation plan of a hydropower station unit under a runoff mode provided in the above embodiment of this application, and will not be repeated here.

[0105] The processing unit 22 is configured to determine a machine-end output load value of each hydropower station unit based on the hydropower station parameter set, and send the machine-end output load value of each hydropower station unit to the determining unit 23 .

[0106] Among them, the process of determining the end output load value of each hydropower station unit refers to the description of steps 102 to 104 and the limiting steps of each step in the method for determining the daily power generation plan of a hydropower station unit under a runoff mode provided in the above embodiment of this application, and will not be repeated here.

[0107] Determination unit 23 is configured to determine a daily power generation plan for each hydropower station unit under the runoff mode based on the terminal output load value of each hydropower station unit. The specific determination process is described in step 105 of the method for determining a daily power generation plan for a hydropower station unit under the runoff mode provided in the above embodiment of this application and will not be repeated here.

[0108] The control unit 24 is configured to control the water level of the corresponding reservoir within the hydropower station to meet a preset safety range using a preset control method based on the hydropower station parameter set. The specific control process is described with reference to the implementation process for controlling the reservoir water level to meet a preset safety range in the method for determining the daily power generation plan of a hydropower station unit under a runoff mode provided in the above-mentioned embodiment of this application, and will not be further described here.

[0109] The embodiment of the present application provides a system for determining the daily power generation plan of the hydropower station units and a reservoir water level control system under the runoff mode, which realizes the determination of the daily power generation plan of the hydropower station units and, at the same time, can control the reservoir water level within the range of safety requirements.

[0110] In one example, a system for calculating the daily power generation plan and reservoir water level control of a simulated hydropower station unit under a runoff mode is provided, comprising: a reservoir water level acquisition module, a unit output acquisition module, a tailwater level calculation module, a head loss calculation module, a net head calculation module, a unit operation efficiency calculation module, and a spillway discharge facility flow calculation module.

[0111] The system is respectively connected with the communication and control module of the AGC module of the power station monitoring system and the communication and control module of the power station flood discharge facility system.

[0112] Among them, the reservoir water level acquisition module is used to obtain the reservoir water level, the unit output acquisition module is used to obtain the output of each unit, the tail water level calculation module, the head loss calculation module, and the net water head calculation module are used to calculate the tail water level, head loss and net water head, the unit operation efficiency calculation model is used to calculate the unit operation efficiency based on the net water head and the unit power generation flow, and the flood discharge facility flow calculation module is used to calculate the relationship between the flood discharge flow and the flood discharge facility gate opening under different reservoir water level elevations.

[0113] Optionally, the system publishes the calculated daily power generation plan to the communication and control module of the AGC module of the power station monitoring system to realize the issuance and correction of the unit load instructions; and publishes and corrects the calculated flood discharge facility gate opening instructions to the communication and control module of the power station flood discharge facility system to realize the opening and closing of the gate.

[0114] Optionally, the control flow of the system is shown in FIG4 .

[0115] Through this simulation hydropower station unit daily power generation plan and reservoir water level control calculation system under the runoff mode, the communication and control functions of the AGC functional module of the power station monitoring system and the spillway gate control system are realized, and the automatic collection and acquisition of relevant data and information, automatic calculation, issuance of instructions, as well as comprehensive judgment and alarm functions are realized, providing a scientific basis for the integrated automatic water-power dispatching function of reservoirs and power stations under the runoff mode.

[0116] The present application also provides a device for determining a daily power generation plan of a hydropower station unit under a runoff mode, as shown in FIG5 , the device comprising:

[0117] The acquisition and determination module 301 is used to obtain the inflow flow of each hydropower unit in the hydropower station under the runoff mode and the reservoir water level of the reservoir in the hydropower station, and determine the unit power generation flow and flood discharge flow based on the inflow flow; for details, please refer to the relevant description of step 101 in the above method embodiment.

[0118] The first determination module 302 is used to determine the net head of each hydropower station unit based on the reservoir water level, the power generation flow of the unit and the flood discharge flow through a preset processing method; for details, please refer to the relevant description of step 102 in the above method embodiment.

[0119] The second determination module 303 is used to determine the comprehensive operating efficiency of each hydropower station unit based on the net water head and the power generation flow of the unit through the characteristic curve of each hydropower station unit; for details, please refer to the relevant description of step 103 in the above method embodiment.

[0120] The third determination module 304 is used to determine the terminal output load value of each hydropower station unit based on the net water head, the unit power generation flow and the comprehensive operation efficiency; for details, please refer to the relevant description of step 104 in the above method embodiment.

[0121] The fourth determination module 305 is used to determine the daily power generation plan of the hydropower station unit in the runoff mode based on the terminal output load value of each hydropower station unit; for details, please refer to the relevant description of step 105 in the above method embodiment.

[0122] The device for determining the daily power generation plan of a hydropower station unit under the runoff mode provided in the embodiment of the present application obtains parameters such as the inflow rate, reservoir water level, unit power generation flow rate, and flood discharge flow rate to determine the output load value of each unit under the current water conditions, providing a scientific basis for determining the power generation plan of the hydropower station under the runoff mode; optionally, based on the operating characteristics of the hydropower station under the runoff mode, the net head of the generator and the required unit power generation flow rate are used to formulate the power generation plan in real time, thereby realizing the determination and adjustment of the daily power generation plan of the hydropower station unit. Therefore, by implementing this application, a daily power generation plan can be formulated reasonably and effectively.

[0123] As an optional implementation of an embodiment of the present application, the first determination module includes: a first processing submodule, which is used to obtain the tail water level of the hydropower station based on the power generation flow of the unit and the flood discharge flow, through a preset first relationship, and the preset first relationship reflects the relationship between the tail water level and the outflow flow of the hydropower station; a second processing submodule, which is used to obtain the net water head of each unit of the hydropower station based on the reservoir water level, the power generation flow of the unit and the tail water level, through a preset processing method.

[0124] As an optional implementation of the embodiment of the present application, the second processing sub-module includes: a first determination sub-module, used to determine the gross head of the hydropower station based on the reservoir water level and the tail water level; a third processing sub-module, used to obtain the head loss of each unit of the hydropower station based on the power generation flow of the unit through the preset processing method; and a second determination sub-module, used to determine the net head of each unit of the hydropower station based on the gross head and the head loss.

[0125] As an optional implementation of the embodiment of the present application, the second determination module includes: a first acquisition submodule, used to obtain the impeller diameter and rated speed of each hydropower station unit; a third determination submodule, used to determine the unit flow and unit speed of each hydropower station unit based on the net water head, the unit power generation flow, the impeller diameter and the rated speed; a fourth determination submodule, used to determine the comprehensive operating efficiency of each hydropower station unit based on the unit flow and unit speed through the characteristic curve.

[0126] As an optional implementation of the embodiment of the present application, the device also includes: an acquisition module for acquiring the forecasted incoming flow; a comparison module for comparing the incoming flow with the forecasted incoming flow; and an adjustment module for load adjusting the incoming flow at a preset time node when the incoming flow is greater than the forecasted incoming flow.

[0127] As an optional implementation of an embodiment of the present application, the adjustment module includes: a second acquisition submodule, used to obtain the power station load pattern of the hydropower station; a judgment submodule, used to judge whether the power station load pattern is subject to the constraints of the power grid power generation instruction; a first adjustment submodule, used to send the hydropower station unit daily power generation plan modification instruction to the dispatching terminal at the preset time node when the power station load pattern is subject to the power grid power generation instruction, and based on the hydropower station unit daily power generation plan modification instruction, perform load adjustment on the inflow flow, and the dispatching terminal is connected to the hydropower station; a second adjustment submodule, used to adjust the inflow flow according to the preset time interval of the hydropower station when the power station load pattern is not constrained by the power grid power generation instruction.

[0128] As an optional implementation of the embodiment of the present application, the device also includes: a fifth determination module, used to determine the gate operation mode corresponding to the flood discharge facilities in the hydropower station under the runoff mode based on preset requirements; a processing module, used to obtain the gate opening value corresponding to the flood discharge flow based on the reservoir water level through a preset second relationship, and the preset second relationship represents the functional relationship between the flood discharge flow, the reservoir water level and the gate opening; a control module, used to control the reservoir water level to meet a preset safety range based on the gate opening value under the gate operation mode.

[0129] For a detailed description of the function of the device for determining the daily power generation plan of a hydropower station unit under the runoff mode provided in the embodiment of the present application, please refer to the description of the method for determining the daily power generation plan of a hydropower station unit under the runoff mode in the above embodiment.

[0130] The present application also provides a storage medium, as shown in FIG6 , on which is stored a computer program 601 that, when executed by a processor, implements the steps of the method for determining a daily power generation plan for a hydropower station unit under a runoff mode in the above-described embodiment. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD), or a solid-state drive (SSD); the storage medium may also include a combination of the aforementioned types of memory.

[0131] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD), or a solid-state drive (SSD). The storage medium can also include a combination of the above-mentioned types of memory.

[0132] An embodiment of the present application also provides an electronic device, as shown in FIG7 , which may include a processor 71 and a memory 72 , wherein the processor 71 and the memory 72 may be connected via a bus or other means, with FIG7 taking the bus connection as an example.

[0133] The processor 71 may be a central processing unit (CPU). The processor 71 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0134] Memory 72, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as the corresponding program instructions / modules in the embodiments of the present application. Processor 71 executes the non-transitory software programs, instructions, and modules stored in memory 72 to perform various processor functions and data processing, thereby implementing the method for determining a daily power generation plan for a hydropower station unit under a runoff mode in the above-described method embodiment.

[0135] The memory 72 may include a program storage area and a data storage area, wherein the program storage area may store applications required for operating the device or at least one function; the data storage area may store data created by the processor 71, etc. In addition, the memory 72 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 72 may optionally include a memory remotely located relative to the processor 71, and these remote memories may be connected to the processor 71 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0136] The one or more modules are stored in the memory 72 , and when executed by the processor 71 , perform the method for determining the daily power generation plan of the hydropower station unit under the runoff mode in the embodiment shown in FIG1-2 .

[0137] The specific details of the above electronic device can be understood by referring to the corresponding descriptions and effects in the embodiments shown in Figures 1 to 2, and will not be repeated here.

[0138] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A method for determining a daily power generation plan for a hydropower station unit under a runoff mode, characterized in that: The method comprises: Obtaining the inflow flow of each hydropower unit in the hydropower station and the reservoir water level of the reservoir in the hydropower station under the runoff mode, and determining the unit power generation flow and flood discharge flow based on the inflow flow; Based on the water level of the reservoir, the power generation flow of the unit and the flood discharge flow, the net water head of each unit of the hydropower station is determined through a preset processing method; Based on the net water head and the power generation flow of the unit, the comprehensive operating efficiency of each unit of the hydropower station is determined through the characteristic curve of each unit of the hydropower station; Determining the output load value of each unit of the hydropower station based on the net water head, the power generation flow of the unit and the comprehensive operation efficiency; The daily power generation plan of the hydropower station unit under the runoff mode is determined based on the terminal output load value of each hydropower station unit.

2. The method according to claim 1, characterized in that Based on the water level of the reservoir, the power generation flow of the unit and the flood discharge flow, the net water head of each unit of the hydropower station is determined through a preset processing method, including: Based on the power generation flow of the unit and the flood discharge flow, the tail water level of the hydropower station is obtained through processing with a preset first relational expression, wherein the preset first relational expression reflects the relationship between the tail water level of the hydropower station and the outflow flow; Based on the reservoir water level, the power generation flow of the unit and the tail water level, the net water head of each unit of the hydropower station is obtained through a preset processing method.

3. The method according to claim 2, characterized in that Based on the reservoir water level, the power generation flow of the unit and the tail water level, a net water head of each unit of the hydropower station is obtained through a preset processing method, including: Determining the gross water head of the hydropower station based on the reservoir water level and the tailwater level; Based on the power generation flow of the unit, the head loss of each unit of the hydropower station is obtained through the preset processing method; The net water head of each unit of the hydropower station is determined based on the gross water head and the head loss.

4. The method according to claim 1, characterized in that: Based on the net water head and the power generation flow of the unit, the comprehensive operation efficiency of each unit of the hydropower station is determined through the characteristic curve of each unit of the hydropower station, including: Obtaining the runner diameter and rated speed of each hydropower station unit; Determine the unit flow and unit speed of each unit of the hydropower station based on the net water head, the power generation flow of the unit, the runner diameter and the rated speed; Based on the unit flow and unit speed, the comprehensive Combined operating efficiency.

5. The method according to claim 1, characterized in that The method further comprises: Obtain forecast inbound traffic; Comparing the inflow flow with the forecast inflow flow; When the inflow flow is greater than the forecast inflow flow, the inflow flow is load adjusted at a preset time node.

6. The method according to claim 5, characterized in that The load adjustment of the inflow flow is performed at a preset time node, including: Obtaining a power station load mode of the hydropower station; Determining whether the power station load mode is subject to the constraints of the power grid power generation instruction; When the load mode of the power station is constrained by the power generation instruction of the power grid, a daily power generation plan modification instruction of the hydropower station unit is sent to the dispatching terminal at the preset time node, and based on the daily power generation plan modification instruction of the hydropower station unit, the load of the inflow flow is adjusted, and the dispatching terminal is connected to the hydropower station; When the load mode of the power station is not constrained by the power grid power generation instruction, the inflow flow is load adjusted according to the preset time interval of the hydropower station.

7. The method according to claim 1, characterized in that The method further comprises: Based on preset requirements, determining the gate operation mode corresponding to the flood discharge facilities in the hydropower station under the runoff mode; Based on the reservoir water level, a gate opening value corresponding to the flood discharge flow is obtained through processing with a preset second relational expression, wherein the preset second relational expression represents a functional relationship between the flood discharge flow, the reservoir water level and the gate opening; In the gate operation mode, the reservoir water level is controlled to meet a preset safety range based on the gate opening value.

8. A daily power generation plan determination and reservoir water level control system for a hydropower station unit under a runoff mode, used to execute the method for determining a daily power generation plan for a hydropower station unit under a runoff mode as claimed in any one of claims 1 to 7; characterized in that: The system comprises: An acquisition unit, used for acquiring a parameter set of a hydropower station in a runoff mode, and sending the parameter set of the hydropower station to a processing unit and a control unit; The processing unit is used to determine the machine-end output load value of each of the hydropower station units based on the hydropower station parameter set, and send the machine-end output load value of each of the hydropower station units to the determination unit; The determining unit is used to determine the daily power generation plan of the hydropower station unit in the runoff mode based on the terminal output load value of each hydropower station unit; The control unit is used to control the water in the hydropower station using a preset control method based on the hydropower station parameter set. The water level of the reservoir corresponding to the reservoir meets the preset safety range.

9. A device for determining daily power generation plan of hydropower station units under runoff mode, characterized in that: The device comprises: An acquisition and determination module, used to acquire the inflow flow of each hydropower unit in the hydropower station and the reservoir water level of the reservoir in the hydropower station under the runoff mode, and determine the unit power generation flow and flood discharge flow based on the inflow flow; A first determination module is used to determine the net water head of each unit of the hydropower station based on the water level of the reservoir, the power generation flow of the unit and the flood discharge flow through a preset processing method; A second determination module is used to determine the comprehensive operation efficiency of each of the hydropower station units based on the net water head and the power generation flow of the unit through the characteristic curve of each of the hydropower station units; A third determination module is used to determine the machine-end output load value of each of the hydropower station units based on the net water head, the power generation flow of the unit and the comprehensive operation efficiency; The fourth determination module is used to determine the daily power generation plan of the hydropower station unit under the runoff mode based on the machine-end output load value of each hydropower station unit.

10. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores a computer program, and the processor executes the method for determining the daily power generation plan of a hydropower station unit under the runoff mode as described in any one of claims 1 to 7 by executing the computer program.

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