Hydropower station unit output calculation method considering ecological flow and stable operation area, storage medium and equipment

Abstract

The invention belongs to the technical field of hydropower station output calculation, and particularly provides a hydropower station unit output calculation method considering ecological flow and a stable operation area, a storage medium and equipment. Comprising the steps that a unit output stable area table, the minimum output corresponding to the ecological flow, the number of whole-plant units, the number of overhaul units, the upstream water level intra-day maximum value, the upstream water level intra-day minimum value, the downstream water level maximum value and the downstream water level minimum value are obtained; the maximum operation water head and the minimum operation water head of the power station are calculated, then according to the maximum operation water head and the minimum operation water head of the power station, the upper limit and the lower limit of output of a single unit are searched in the unit stable operation area table, and the upper limit and the lower limit are the maximum output of the single unit and the minimum output of the single unit respectively; and calculating the maximum total output and the minimum total output of the power station. According to the method, factors such as power station overhaul influence, a hydraulic turbine set stable operation area and reservoir ecological flow are comprehensively considered, and hydropower station set output is accurately calculated.

Description

Technical Field

[0001] This invention belongs to the field of hydropower station output calculation technology, specifically, it relates to a method, storage medium and equipment for calculating the output of hydropower station units that takes into account ecological flow and stable operating zone. Background Technology

[0002] Hydropower stations are playing an increasingly indispensable role in supporting the flexibility and reliability of the power system, transforming into "regulators" and "stabilizers" that ensure grid security and promote the consumption of new energy sources. Simultaneously, with the advancement of electricity marketization, many regions are implementing long-cycle power dispatch operations, and the trading of hydropower station electricity is gradually shifting from planned to market-based transactions. All of these factors require hydropower stations to be able to quickly and accurately calculate their output to meet grid regulation needs and electricity market clearing requirements.

[0003] In existing technologies, the power output of hydropower station units is mainly calculated manually, which is greatly affected by the experience level and working conditions of the staff. The calculation of hydropower station unit output primarily focuses on the stable operating range of the turbine unit, the ecological flow requirements of the hydropower station, and maintenance constraints. Existing technologies have the following main drawbacks: 1. Manual calculations are prone to bias and errors; 2. The calculation speed is slow and the efficiency is low, which cannot meet the requirements of the electricity market. 3. At the same time, the existing power output calculation methods do not take into account ecological flow. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method, storage medium and equipment for calculating the output of hydropower station units that takes into account ecological flow and stable operating zone. It comprehensively considers factors such as the impact of power station maintenance, the stable operating zone of turbine units and reservoir ecological flow, and accurately calculates the output of hydropower station units.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for calculating the output of hydropower station units considering ecological flow and stable operating zones, comprising the following steps: Step 1: Obtain the unit output stability zone table and the minimum output corresponding to the ecological flow. Total number of generating units in the plant Number of units under maintenance The highest daily water level in the upstream area Daily minimum water level upstream Maximum downstream water level Minimum downstream water level ; Step 2: Calculate the maximum operating head of the power station based on the maximum and minimum water levels upstream and downstream. and minimum operating head Then, based on the power station's maximum and minimum operating heads, the upper and lower limits of a single unit's output are obtained from the unit's stable operating zone table, which are the maximum output limits of a single unit. and minimum output of a single unit ; Step 3: Calculate the maximum total output of the power plant The maximum total output of the power plant is the product of the number of available generating units and the maximum output of a single generating unit. Step 4: Calculate the minimum total output of the power plant .

[0006] In the preferred embodiment, the method for obtaining the stable output zone table of the unit in step one is as follows: it is compiled based on the actual operating data and test results of the hydropower station turbine unit. The stable operating zone must meet the requirement that the output of the turbine generator unit during normal operation is between the maximum output and the minimum output of the zone.

[0007] In the preferred embodiment, step one satisfies the minimum output corresponding to the ecological flow. The method for obtaining this is as follows: the reservoir must meet the requirement that the minimum outflow is greater than the ecological flow. The minimum output calculated based on the outflow is the minimum output required to meet the ecological flow requirement. .

[0008] In the preferred embodiment, in step one, the maximum and minimum downstream water levels of the reservoir are estimated based on the power output forecast of the hydropower station and the recent downstream water level. The operation method is as follows: first, query the historical downstream water level corresponding to the power output of different power stations in the recent period to obtain the correspondence between the power station output and the downstream water level; then, based on the recent power output forecast of the hydropower station, query the maximum and minimum downstream water levels of the reservoir.

[0009] In the preferred embodiment, in step two, the maximum operating head of the power station... and minimum operating head The calculation formula is: ; .

[0010] In the preferred embodiment, in step two, the maximum output corresponding to the minimum head is found in the unit's stable operating zone table. Minimum output corresponding to maximum head .

[0011] In the preferred embodiment, in step three, the maximum total output of the power station... The calculation formula is: ; in, Number of generating units in the entire plant; Number of generating units under maintenance ; This represents the number of available generating units.

[0012] In the preferred embodiment, in step four, the minimum total output of the power plant is... The calculation method is as follows: S401, with P i =0 is the minimum total output of the power plant. The initial output base number, i=1, is used as the initial cycle count, i.e. P 1 = 0; S402, will Assign to That is, P i+1 =P i +P 大 ; S403. Judgment Is it less than If yes, assign i+1 to i, that is, increment the loop count by 1, and then return to step S402 for calculation; if no, proceed to step S404. S404, Judgment Is it greater than If so, Assign to ,Right now = If not, terminate the loop; otherwise, proceed to step S405. S405, will Assign to ,Right now = .

[0013] The present invention also provides a computer-readable storage medium storing computer instructions for causing the computer to execute the above-described method for calculating the output of hydropower station units considering ecological flow and stable operating zones.

[0014] The present invention also provides an electronic device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the above-described method for calculating the output of hydropower station units considering ecological flow and stable operating zones.

[0015] The present invention provides a method, storage medium, and equipment for calculating the output of hydropower station units considering ecological flow and stable operating zones, which has the following beneficial effects: 1. Traditional hydropower station unit output calculations rely on manual experience, which is prone to errors due to staff skill level and work conditions, and the calculation speed is slow. This invention eliminates subjective human judgment in the calculation process. It completely avoids human estimation errors, and the calculation efficiency is more than 10 times higher than manual calculation, enabling rapid response to real-time needs such as electricity market clearing and grid regulation.

[0016] 2. Traditional power output calculations often neglect ecological requirements, leading to reservoir outflows falling below ecological flow rates and damaging downstream aquatic ecosystems. This invention takes ecological protection as a core constraint: Step one clearly obtains the minimum power output corresponding to the ecological flow rate; in Step four, when calculating the minimum total power output, iterative logic is used to forcefully ensure that the final output minimum total power output is not lower than this value. This ensures from the calculation source that power plant operation does not sacrifice downstream ecology, solving the drawbacks of traditional methods that prioritize power generation over ecology, and achieving synergy between hydropower development and ecological protection.

[0017] 3. Operating turbine units in unstable operating zones easily leads to component wear and frequent failures, which traditional methods struggle to accurately avoid. This invention achieves precise avoidance of unstable operating zones within a day through head intersection. Step one, the stable operating zone table for unit output, is compiled based on actual operating data and experiments, clearly defining the stable output range under different heads and avoiding unstable operating zones. Step two calculates the maximum / minimum head within the day and takes the intersection of the corresponding stable operating zones to determine the maximum output under the minimum head and the minimum output under the maximum head for a single unit. This range ensures that regardless of daily head fluctuations, the unit can operate within the stable zone, avoiding unstable zones. Simultaneously, the maximum total output is calculated based on the number of available units multiplied by the maximum stable output of a single unit, preventing unit overload operation, reducing equipment fatigue damage, extending unit lifespan, and lowering maintenance costs.

[0018] 4. Traditional power output calculations often fail to adequately consider unit maintenance, leading to planned output exceeding the actual available unit capacity. This invention directly incorporates maintenance constraints into the calculation logic: Step one inputs the total number of units in the plant and the number of units under maintenance; Step three determines the actual number of operational units by calculating the number of available units = total number of units in the plant - number of units under maintenance, and then multiplies this by the maximum stable output of a single unit to obtain the maximum total output. This design ensures that the power output plan is fully adapted to the power plant's maintenance schedule, preventing unreasonable scheduling of maintenance units and guaranteeing the safe operation of the power plant and the orderly conduct of maintenance work.

[0019] 5. The daily head of a hydropower station fluctuates due to factors such as upstream inflow and downstream backwater. Traditional methods, based on a fixed head, can easily lead to output exceeding the unit's stable operating range during certain periods. This invention solves this problem through dynamic daily head calculation: by using the daily maximum / minimum upstream and downstream water levels, the maximum / minimum daily head is calculated using a formula; based on the intersection of this head range and the stable operating range, the feasible upper and lower limits of the unit's output throughout the day are determined. Regardless of daily head variations, the final total output range ensures stable unit operation, avoiding the problem of infeasible output during certain periods caused by traditional fixed head calculations, and improving the practicality of output planning. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a flowchart of the calculation method according to an embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0022] Example 1: like Figure 1 As shown, a method for calculating the power output of a hydropower station unit considering ecological flow and stable operating zone includes the following steps: S1. Input the stable operating range table for the turbine generator units. Based on the actual operating conditions of the power station equipment and test results, the hydropower station obtains the stable operating range of the turbine generator units under different water heads. Under normal circumstances, the turbine generator units must operate between the maximum and minimum output within the stable operating range.

[0023] S2, Input the minimum output corresponding to ecological flow. The reservoir must meet the requirement that the minimum outflow is greater than the ecological flow, and the corresponding minimum output should be calculated based on the flow rate.

[0024] The reservoir must meet the requirement that the minimum outflow is greater than the ecological flow. The minimum output calculated based on the outflow is the minimum output required to meet the ecological flow requirement. .

[0025] The method for calculating the minimum output based on flow rate is as follows: First, calculate the average operating head by averaging the maximum and minimum operating heads. Then, based on the relationship between head, output, and flow rate in the comprehensive operating characteristic curve of the power plant unit, find the output corresponding to the ecological flow rate and the average operating head. This output is the minimum output of the power plant that satisfies the ecological flow rate.

[0026] S3, Input the total number of units in the plant Number of units under maintenance Based on the actual maintenance situation of the power plant, obtain the total number of installed units and the number of units under maintenance.

[0027] S4, Input the highest intraday value of upstream water level The lowest daily water level in the upstream area Based on the upstream reservoir outflow, the forecasted rainfall in the region, and the operation of the hydropower station itself, the maximum and minimum upstream water levels are determined according to the calculated intraday water volume.

[0028] S5. Estimate the maximum downstream water level. Downstream water level minimum The downstream water level of the reservoir is affected by factors such as the reservoir's outflow and the backwater effect. Based on the hydropower station's output forecast and recent downstream water level conditions, the maximum and minimum downstream water levels are estimated. Specifically, the process involves: first, querying the historical downstream water levels corresponding to the recent output of different power stations to obtain the correlation between power station output and downstream water level; then, based on the recent hydropower station output forecast, querying the maximum and minimum downstream water levels.

[0029] S6. Calculate the maximum and minimum operating head of the power station. Calculate the maximum and minimum head based on the water levels upstream and downstream of the reservoir. , .

[0030] S7. Determine the upper and lower limits of output for a single generator unit based on the head. , The table of stable operating zones for the units contains upper and lower limits of output corresponding to different water heads; the higher the water head, the larger the corresponding upper and lower limits of output. This calculation method aims to obtain the area where the unit can operate at any time of day, so it takes the intersection of the stable operating zones for the maximum and minimum water heads. The maximum output corresponding to the minimum water head is then obtained by referring to the table. Minimum output corresponding to maximum head .

[0031] S8, Calculate the maximum total output of the power station The number of available generating units is obtained by subtracting the number of units under maintenance from the total number of installed generating units. The product of the number of available generating units and the maximum output of a single unit is the maximum total output of the power station.

[0032] S9, with P 1=0 as the minimum total output of the power station The initial output base number, i=1 is used as the initial cycle count; S10, will Assign to ,Right now P i+1 = Pi + P 大 .

[0033] S11, Judgment Is it less than If yes, assign i+1 to i, that is, increment the loop count by 1, and proceed to step S10; otherwise, proceed to step S12.

[0034] S12, Judgment Is it greater than If so, Assign to If not, proceed to step S13 for calculation.

[0035] S13, will Assign to .

[0036] S14, Output , .

[0037] Based on this calculation method, the maximum and minimum daily power output of two hydropower stations in the Yangtze River basin were calculated, and the data was used in the southern regional electricity market. After a three-month trial operation, the power station output constraints were calculated normally and accurately.

[0038] Example 2: This embodiment provides a computer-readable storage medium storing computer instructions for causing the computer to execute the hydropower station unit output calculation method considering ecological flow and stable operating zone as described in Embodiment 1 above.

[0039] Example 3: The present invention also provides an electronic device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the hydropower station unit output calculation method considering ecological flow and stable operating zone as described in Embodiment 1.

[0040] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for calculating the power output of hydropower station units considering ecological flow and stable operating zones, characterized in that, Includes the following steps: Step 1: Obtain the unit output stability zone table and the minimum output corresponding to the ecological flow. Total number of generating units in the plant Number of units under maintenance The highest daily water level in the upstream area Daily minimum water level upstream Maximum downstream water level Minimum downstream water level ; Step 2: Calculate the maximum operating head of the power station based on the maximum and minimum water levels upstream and downstream. and minimum operating head Then, based on the power station's maximum and minimum operating heads, the upper and lower limits of a single unit's output are obtained from the unit's stable operating zone table, which are the maximum output limits of a single unit. and minimum output of a single unit ; Step 3: Calculate the maximum total output of the power plant The maximum total output of the power plant is the product of the number of available generating units and the maximum output of a single generating unit. Step 4: Calculate the minimum total output of the power plant .

2. The method for calculating the output of a hydropower station unit considering ecological flow and stable operating zone as described in claim 1, characterized in that, In step one, the method for obtaining the stable output zone table of the unit is as follows: it is compiled based on the actual operating data and test results of the hydropower station turbine units. The stable operating zone must meet the requirement that the output of the turbine generator unit during normal operation is between the maximum output and the minimum output of the zone.

3. The method for calculating the output of a hydropower station unit considering ecological flow and stable operating zone as described in claim 1, characterized in that, In step one, the minimum output corresponding to the ecological flow is satisfied. The method for obtaining this is as follows: the reservoir must meet the requirement that the minimum outflow is greater than the ecological flow. The minimum output calculated based on the outflow is the minimum output required to meet the ecological flow requirement. .

4. The method for calculating the output of a hydropower station unit considering ecological flow and stable operating zone as described in claim 1, characterized in that, In step one, the maximum and minimum downstream water levels of the reservoir are estimated based on the power output forecast of the hydropower station and the recent downstream water level. The operation method is as follows: First, query the historical downstream water level corresponding to the power output of different power stations in the recent period to obtain the correspondence between the power station output and the downstream water level. Then, based on the recent power output forecast of the hydropower station, query the maximum and minimum downstream water levels of the reservoir.

5. The method for calculating the output of a hydropower station unit considering ecological flow and stable operating zone according to claim 1, characterized in that, In step two, the power station's maximum operating head and minimum operating head The calculation formula is: ； 。 6. The method for calculating the output of a hydropower station unit considering ecological flow and stable operating zone according to claim 1, characterized in that, In step two, the maximum output corresponding to the minimum head is found in the unit's stable operating zone table. Minimum output corresponding to maximum head .

7. The method for calculating the output of a hydropower station unit considering ecological flow and stable operating zone according to claim 1, characterized in that, In step three, the power station's maximum total output The calculation formula is: ； in, Number of generating units in the entire plant; Number of generating units under maintenance ; This represents the number of available generating units.

8. The method for calculating the output of a hydropower station unit considering ecological flow and stable operating zone according to claim 1, characterized in that, In step four, the minimum total output of the power station The calculation method is as follows: S401, with P i =0 is the minimum total output of the power plant. The initial output base number, i=1, is used as the initial cycle count, i.e. P 1 = 0; S402, will Assign to That is, P i+1 =P i +P 大 ; S403. Judgment Is it less than If yes, assign i+1 to i, that is, increment the loop count by 1, and then return to step S402 for calculation; if no, proceed to step S404. S404, Judgment Is it greater than If so, Assign to ,Right now = If not, terminate the loop; otherwise, proceed to step S405. S405, will Assign to ,Right now = .

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to execute the hydropower station unit output calculation method as described in any one of claims 1 to 8, which considers ecological flow and stable operating zones.

10. An electronic device, characterized in that, include: The system includes a memory and a processor, which are interconnected. The memory stores computer instructions, and the processor executes the computer instructions to perform the hydropower station unit output calculation method considering ecological flow and stable operating zone as described in any one of claims 1 to 8.

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