A method for evaluating monthly generating capacity of hydropower station based on typical year optimization

Abstract

The application discloses a kind of monthly power generation capacity evaluation methods of hydropower station based on typical year optimization.The method comprises the following steps: constructing the total objective function of cascade hydropower station;The initial operation scheme of power generation of cascade hydropower station in wet, flat and dry typical year is optimized, and the optimized operation scheme of power generation of cascade hydropower station in wet, flat and dry typical year is obtained;The minimum monthly power generation capacity of hydropower station, the maximum theoretical monthly power generation output and the maximum monthly operation power generation output of hydropower station are obtained, and the maximum monthly power generation capacity of hydropower station is obtained based on the maximum theoretical monthly power generation output and the maximum monthly operation power generation output of hydropower station, to evaluate the monthly power generation capacity of hydropower station.The application uses the dynamic coupling check of theoretical value and practical value, so that the obtained monthly power generation capacity evaluation result of hydropower station covers the extreme working condition of hydropower station operation, and also considers the optimization operation experience of hydropower station, has engineering practicability and theoretical completeness, and can more effectively guide the optimization scheduling work of hydropower energy.

Description

Technical Field

[0001] This invention relates to the field of hydropower energy optimization and dispatching technology, specifically to a method for evaluating the monthly power generation capacity of a hydropower station based on typical year optimization. Background Technology

[0002] Current hydropower station power generation capacity assessments suffer from the following shortcomings: the lack of dynamic coupling between theoretical limits and actual operational optimization results leads to insufficient engineering applicability of the assessment results; traditional methods often focus on maximizing power generation or ensuring output as a single optimization objective, making it difficult to balance output stability during dry seasons with coverage of extreme operating conditions. This results in the obtained power generation optimization operation schemes failing to balance power supply reliability and economy, and consequently, the subsequent hydropower station power generation capacity assessment results lacking engineering practicality. Summary of the Invention

[0003] To address the aforementioned shortcomings in existing technologies, this invention provides a method for evaluating the monthly power generation capacity of a hydropower station based on typical year optimization.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows: A method for evaluating the monthly power generation capacity of a hydropower station based on typical year optimization includes the following steps: Construct the objective function for maximizing the reliable power generation output of cascade hydropower stations and the objective function for maximizing the annual power generation of cascade hydropower stations, and couple them to construct the overall objective function of cascade hydropower stations; Based on the overall objective function of the cascade hydropower station, the stepwise optimization method is used to optimize the initial operation scheme of the cascade hydropower station in typical years of high, low, and low water levels, so as to obtain the optimized operation scheme of the cascade hydropower station in typical years of high, low, and low water levels. Based on the power generation optimization operation scheme of cascade hydropower stations in typical years of abundant, flat and dry seasons, the minimum monthly power generation capacity, the maximum monthly theoretical power generation output and the maximum monthly operating power generation output of the hydropower stations in typical years of abundant, flat and dry seasons are obtained. Based on the maximum monthly theoretical power generation output and the maximum monthly operating power generation output of the hydropower stations in typical years of abundant, flat and dry seasons, the maximum monthly power generation capacity of the hydropower stations in typical years of abundant, flat and dry seasons is obtained, so as to conduct a monthly power generation capacity assessment of the hydropower stations.

[0005] Furthermore, the overall objective function of the cascade hydropower station is expressed as: in: The total objective function value, To determine the sign of the maximum value, For calculating the time period number, This represents the total number of calculation periods within the year. For the cascade hydropower station in the first Power generation output for each calculation period The penalty coefficient is... For the first The unit step function for each calculation period, To maximize the power output of the cascade hydropower stations during the period of minimum power generation within the year. For the first The number of hours in each calculation period.

[0006] Furthermore, based on the overall objective function of the cascade hydropower stations, a stepwise optimization method is used to optimize the initial operation scheme of the cascade hydropower stations in typical years of high, low, and low water levels, in order to obtain the optimized operation scheme of the cascade hydropower stations in typical years of high, low, and low water levels, including the following steps: Determine the differential search step size for the stepwise optimization method; Based on the overall objective function of the cascade hydropower station and the initial operation scheme of the cascade hydropower station in typical years of abundant, flat and dry seasons, the initial trajectory of the step-by-step optimization method is determined by the simulation pre-optimization method. Based on the overall objective function of the cascade hydropower station and the differentiated search step size of the stepwise optimization method, the initial trajectory of the stepwise optimization method is optimized to obtain the power generation optimization operation scheme of the cascade hydropower station in typical years of abundant, flat and dry seasons.

[0007] Furthermore, determining the differentiated search step size for the stepwise optimization method includes the following steps: Determine the differential search step size for the stepwise optimization method, including the initial differential search step size and the iterative differential search step size; The initial differential search step size for the stepwise optimization method is determined based on the regulation performance of the hydropower station, and is expressed as: in: For the first The initial differential search step size for each hydropower station, For the first The first hydropower station in The maximum allowable operating water level for each calculation period. For the first The first hydropower station in The minimum allowable operating water level for each calculation period. For the first The annual regulation capacity of each hydropower station, The annual adjustment capacity threshold, The coefficient of variation; The differentiated iterative search step size of the successive optimization method is determined based on the termination accuracy or total number of iterations, and is expressed as: in: For the first The first hydropower station Differentiated search step size in each iteration. This represents the change in the overall objective function value of the cascade hydropower stations. For iteration numbering, This represents the total number of iterations. The accuracy of the change in the overall objective function value of the cascade hydropower station.

[0008] Furthermore, based on the optimized operation scheme of cascade hydropower stations in typical years (both wet and dry), the monthly minimum power generation capacity, monthly maximum theoretical power generation output, and monthly maximum operating power generation output of the hydropower stations in typical years are obtained. Then, based on the monthly maximum theoretical power generation output and monthly maximum operating power generation output of the hydropower stations in typical years (both wet and dry), the monthly maximum power generation capacity of the hydropower stations in typical years (both wet and dry) is obtained to conduct a monthly power generation capacity assessment of the hydropower stations, including the following steps: Based on the power generation optimization operation scheme of cascade hydropower stations in typical years of high-yield, low-yield and low-yield, the monthly maximum water consumption rate, monthly maximum water level, monthly maximum inflow and monthly maximum power generation of hydropower stations in typical years of high-yield, low-yield and low-yield are obtained. Based on the monthly maximum water consumption rate of hydropower stations in typical years of abundant, flat and dry seasons, calculate the monthly minimum power generation capacity of hydropower stations in typical years of abundant, flat and dry seasons. Based on the monthly highest water level, monthly maximum inflow, and monthly maximum operating power output of the hydropower station during typical years of abundant, flat, and dry seasons, the monthly maximum theoretical power output of the hydropower station during typical years of abundant, flat, and dry seasons is obtained. Based on the monthly maximum theoretical power output and the monthly maximum operating power output of the hydropower station during typical years of abundant, flat, and dry seasons, the monthly maximum power generation capacity of the hydropower station during typical years of abundant, flat, and dry seasons is obtained. The monthly minimum and maximum power generation capacity of hydropower stations are used to assess the monthly power generation capacity of hydropower stations based on typical years of abundant, flat, and dry seasons.

[0009] Furthermore, based on the monthly maximum water consumption rate of hydropower stations during typical years of high and low water levels, the monthly minimum power generation capacity of hydropower stations during typical years of high and low water levels is calculated and expressed as: in: For the hydroelectric power station in the Minimum power generation output per month For the hydroelectric power station in the Monthly ecological traffic For the hydroelectric power station in the Maximum water consumption rate per month.

[0010] Furthermore, based on the monthly highest water level, monthly maximum inflow, and monthly maximum operating power output of the hydropower station during typical years of high, low, and low water levels, the monthly maximum theoretical power output of the hydropower station during typical years of high, low, and low water levels is obtained. Then, based on the monthly maximum theoretical power output and the monthly maximum operating power output of the hydropower station during typical years of high, low, and low water levels, the monthly maximum power generation capacity of the hydropower station during typical years of high, low, and low water levels is obtained, including the following steps: Based on the monthly highest water level of the hydropower station in a typical year of abundant, flat and dry seasons, the initial monthly reservoir capacity and the final monthly reservoir capacity of the hydropower station in a typical year of abundant, flat and dry seasons are obtained by interpolating the water level and reservoir capacity curve. Based on the monthly maximum inflow, monthly initial reservoir capacity, and monthly final reservoir capacity of the hydropower station in a typical year of abundant, flat, and dry seasons, calculate the monthly maximum outflow of the hydropower station in a typical year of abundant, flat, and dry seasons. The minimum value between the maximum monthly outflow from the reservoir and the maximum monthly inflow through the generator of the hydropower station in a typical year of abundant, flat, and dry conditions is used to obtain the actual monthly power generation flow of the hydropower station in a typical year of abundant, flat, and dry conditions. Based on the actual monthly power generation flow of hydropower stations in typical years of abundant, flat and dry seasons, the monthly calculated power generation output of hydropower stations in typical years of abundant, flat and dry seasons is obtained by using the first calculation formula or the second calculation formula. The first calculation formula is expressed as follows: in: For the hydroelectric power station in the Calculated power generation output over a month This is the output coefficient. For the hydroelectric power station in the Actual power generation flow in a month For the hydroelectric power station in the The initial water level of the month, For the hydroelectric power station in the The water level at the end of the month, Maximum outbound flow The corresponding tailwater level, For the hydroelectric power station in the Maximum outbound flow in a month For the hydroelectric power station in the Monthly head loss; The second calculation formula is expressed as follows: in: For the hydroelectric power station in the Average water consumption rate over the months; The minimum value between the monthly calculated power output of the hydropower station in a typical year of abundant, flat and dry conditions and the upper limit of the monthly power output of the hydropower station is used to obtain the maximum theoretical monthly power output of the hydropower station in a typical year of abundant, flat and dry conditions. The maximum monthly theoretical power generation of the hydropower station in a typical year of abundant, flat, and dry seasons is obtained by taking the maximum monthly operating power generation of the hydropower station.

[0011] Furthermore, based on the monthly maximum inflow, monthly initial reservoir capacity, and monthly final reservoir capacity of the hydropower station in typical years (both wet and dry), the monthly maximum outflow of the hydropower station in typical years (both wet and dry) is calculated and expressed as: in: For the hydroelectric power station in the Maximum outbound flow in a month For the hydroelectric power station in the Initial storage capacity for one month, For the hydroelectric power station in the The storage capacity at the end of the month, This is the conversion factor between storage capacity and flow rate. For the hydroelectric power station in the Maximum inbound volume in a month.

[0012] The beneficial effects of this invention are as follows: (1) This invention obtains the monthly minimum power generation capacity, monthly maximum theoretical power generation output and monthly maximum operating power generation output of the hydropower station by optimizing the power generation operation scheme of the cascade hydropower station in typical years of abundant, flat and dry seasons. Based on the monthly maximum theoretical power generation output and monthly maximum operating power generation output of the hydropower station, the monthly maximum power generation capacity of the hydropower station is obtained, so as to conduct a monthly power generation capacity assessment of the hydropower station. This process combines the monthly maximum theoretical power generation output and monthly maximum operating power generation output of the hydropower station, so that the obtained monthly power generation capacity assessment results of the hydropower station not only cover the extreme operating conditions of the hydropower station and can accurately capture the theoretical power generation potential under extreme operating conditions, but also take into account the optimized operation experience of the hydropower station, objectively reflecting the upper limit of the power generation capacity that the hydropower station can achieve in actual operation. It has both engineering practicality and theoretical completeness, and can more effectively guide the work of optimizing hydropower energy dispatch. (2) This invention constructs an objective function for maximizing the reliable power output of cascade hydropower stations and an objective function for maximizing the annual power generation of cascade hydropower stations, and couples them to construct the overall objective function of cascade hydropower stations. Then, based on the overall objective function of cascade hydropower stations, it obtains the power generation optimization operation scheme of cascade hydropower stations in typical years of abundant, flat and dry seasons. This enables the obtained power generation optimization operation scheme of cascade hydropower stations in typical years of abundant, flat and dry seasons to have sufficient power supply reliability and economy, and thus makes the monthly power generation capacity assessment results of hydropower stations obtained subsequently more practical for engineering. (3) This invention determines the differentiated search step size of the stepwise optimization method, and then, based on the total objective function of the cascade hydropower station and the initial operation scheme of the cascade hydropower station in typical years of high, low, and low water, uses the simulation pre-optimization method to determine the initial trajectory of the stepwise optimization method. Finally, based on the total objective function of the cascade hydropower station and the differentiated search step size of the stepwise optimization method, the initial trajectory of the stepwise optimization method is optimized to obtain the optimized operation scheme of the cascade hydropower station in typical years of high, low, and low water. This process combines the differentiated step size strategy with the simulation pre-optimization method, which improves the convergence efficiency of the multi-objective optimization process of the cascade hydropower station, and thus can obtain the optimized operation scheme of the cascade hydropower station in typical years of high, low, and low water more quickly and accurately. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a method for evaluating the monthly power generation capacity of a hydropower station based on typical year optimization. Detailed Implementation

[0014] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0015] like Figure 1 As shown, a method for evaluating the monthly power generation capacity of a hydropower station based on typical year optimization includes steps S1-S3, as detailed below: S1. Construct the objective function for maximizing the reliable power output of the cascade hydropower station and the objective function for maximizing the annual power generation of the cascade hydropower station, and couple them to construct the overall objective function of the cascade hydropower station.

[0016] In an optional embodiment of the present invention, the present invention constructs an objective function for maximizing the reliable power generation output of a cascade hydropower station, expressed as: in: To maximize the power output of the cascade hydropower stations during the period of minimum power generation within the year. To determine the sign of the maximum value, This refers to the period of minimum power generation for the cascade hydropower stations within the year. To take the sign of the minimum value, This refers to the numbering of the hydropower stations in a cascade hydropower station system. This refers to the number of hydropower stations in a cascade hydropower station system. For the first The first hydropower station in Power generation output coefficient for each calculation period For calculating the time period number, For the first The first hydropower station in Power generation flow rate for each calculation period For the first The first hydropower station in Average net head of power generation over the calculation period.

[0017] This invention constructs an objective function for maximizing the annual power generation of a cascade hydropower station, expressed as: in: To maximize the annual power generation of the cascade hydropower stations, This represents the total number of calculation periods within the year. For the first The number of hours in each calculation period.

[0018] This invention couples the objective function for maximizing the reliable power output of cascade hydropower stations and the objective function for maximizing the annual power generation of cascade hydropower stations to construct the overall objective function of cascade hydropower stations, expressed as: The overall objective function of a cascade hydropower station is expressed as: in: The objective function value of the cascade hydropower station is... To determine the sign of the maximum value, For calculating the time period number, This represents the total number of calculation periods within the year. For the cascade hydropower station in the first Power generation output for each calculation period The penalty coefficient is... For the first The unit step function for each calculation period, when hour, Equal to 1, when hour, Equal to 0, To maximize the power output of the cascade hydropower stations during the period of minimum power generation within the year. For the first The number of hours in each calculation period.

[0019] Specifically, in practical work, this invention determines the design guarantee rate (the degree of guarantee of the power production capacity of cascade hydropower stations) and finds a penalty coefficient suitable for the design guarantee rate through reservoir scheduling.

[0020] S2. Based on the overall objective function of the cascade hydropower stations, the stepwise optimization method is used to optimize the initial operation scheme of the cascade hydropower stations in typical years of high, low, and low water levels, so as to obtain the optimized operation scheme of the cascade hydropower stations in typical years of high, low, and low water levels.

[0021] In an optional embodiment of the present invention, step S2 includes steps S21-S23, as follows: S21. Determine the differential search step size for the stepwise optimization method.

[0022] Step S21 includes steps S211-S213, as follows: S211. Determine the differential search step size of the stepwise optimization method, including the initial differential search step size and the iterative differential search step size of the stepwise optimization method.

[0023] S212. Determine the initial differential search step size for the stepwise optimization method based on the regulation performance of the hydropower station, expressed as: in: For the first The initial differential search step size for each hydropower station, For the first The first hydropower station in The maximum allowable operating water level for each calculation period. For the first The first hydropower station in The minimum allowable operating water level for each calculation period. For the first The annual regulation capacity of each hydropower station, The annual adjustment capacity threshold, The difference coefficient is determined empirically by the total number of iterations, typically in the tens of thousands. Take 100.

[0024] S213. Determine the differentiated iterative search step size of the successive optimization method based on the termination accuracy or total number of iterations, expressed as: in: For the first The first hydropower station Differentiated search step size in each iteration. This represents the change in the overall objective function value of the cascade hydropower stations. For iteration numbering, This represents the total number of iterations. The accuracy of the overall objective function value of the cascade hydropower station is set according to the required level of precision in actual work.

[0025] S22. Based on the overall objective function of the cascade hydropower station and the initial operation scheme of the cascade hydropower station in typical years of abundant, flat and dry seasons, the initial trajectory of the step-by-step optimization method is determined by the simulation pre-optimization method.

[0026] Specifically, the typical year for abundant, normal, and dry seasons includes a typical year during the abundant water period, a typical year during the normal water period, and a typical year during the dry season, totaling three typical years. The initial operation plan for the cascade hydropower stations during these three years includes the water consumption rate, water level, inflow, and power output of each hydropower station in the cascade hydropower station during each calculation period. This invention obtains the monthly water level state trajectory of the cascade hydropower stations during these typical years based on the initial operation plan, and uses the overall objective function of the cascade hydropower stations to pre-optimize the monthly water level state trajectory to obtain pre-optimization results. The optimal state trajectory in the pre-optimization results is then determined as the initial trajectory for the stepwise optimization method.

[0027] S23. Based on the overall objective function of the cascade hydropower station and the differentiated search step size of the stepwise optimization method, the initial trajectory of the stepwise optimization method is optimized to obtain the power generation optimization operation scheme of the cascade hydropower station in typical years of abundant, flat and dry seasons.

[0028] Step S23 includes steps S231-S234, as follows: S231. Based on the initial trajectory of the stepwise optimization method, the numbering order of the hydropower stations in the cascade hydropower stations is fixed. The water levels of the hydropower station in the 0th and 2nd calculation periods. and The water level remains unchanged; the water level for the first calculation period is adjusted. (Taking three schemes respectively: original water level minus 1 differential search step, original water level, and original water level plus 1 differential search step), then there are 3N schemes for water level change of cascade hydropower stations. Calculate the total objective function of the cascade hydropower stations for each scheme in the 0th and 1st calculation periods. Select the scheme with the optimal total objective function of the cascade hydropower stations as the new water level of each hydropower station in the 1st calculation period, and proceed to step S232.

[0029] S232. Perform optimization calculations on the water levels of each hydropower station in the cascade hydropower station series for the next calculation period, first fixing the first... The water levels of the hydropower station in the first and third calculation periods. and No change, adjust the number The water level of the hydropower station in the second calculation period The overall objective function of each scheme for the cascade hydropower stations is calculated in the first and third calculation periods. The scheme with the optimal overall objective function for the cascade hydropower stations is selected as the new water level of each hydropower station in the second calculation period.

[0030] S233. Repeat step S232 until all calculation periods are traversed, completing one cycle and obtaining the new water level of each hydropower station in the cascade hydropower station for each calculation period.

[0031] S234. Determine whether the termination condition is met. If so, exit the loop and determine the new water level of each hydropower station in the cascade hydropower station in each calculation period obtained in the last loop as the power generation optimization operation scheme of the cascade hydropower station in the typical year of abundant, flat and dry seasons. Otherwise, determine the new water level of each hydropower station in the cascade hydropower station in each calculation period obtained in the last loop as the initial trajectory of the new stepwise optimization method, and return to step S231.

[0032] Specifically, the termination condition can be set by setting the maximum number of iterations, setting the error precision, or setting the extreme value change range.

[0033] S3. Based on the power generation optimization operation scheme of cascade hydropower stations in typical years of abundant, flat and dry seasons, obtain the monthly minimum power generation capacity, monthly maximum theoretical power generation output and monthly maximum operating power generation output of hydropower stations in typical years of abundant, flat and dry seasons. Based on the monthly maximum theoretical power generation output and monthly maximum operating power generation output of hydropower stations in typical years of abundant, flat and dry seasons, obtain the monthly maximum power generation capacity of hydropower stations in typical years of abundant, flat and dry seasons, so as to conduct a monthly power generation capacity assessment of hydropower stations.

[0034] In an optional embodiment of the present invention, step S3 includes steps S31-S34, as follows: S31. Based on the power generation optimization operation scheme of cascade hydropower stations in typical years of high-yield, low-yield and low-yield, obtain the monthly maximum water consumption rate, monthly maximum water level, monthly maximum inflow and monthly maximum power generation of the hydropower stations in typical years of high-yield, low-yield and low-yield.

[0035] Specifically, this invention is based on the power generation optimization operation scheme of cascade hydropower stations in typical years of abundant, flat, and dry seasons. By obtaining the water consumption rate, water level, inflow, and power generation output of each hydropower station in the cascade hydropower station during the monthly calculation period of the maximum water consumption rate, the highest water level, the maximum inflow, and the maximum power generation output in the three typical years of abundant, flat, and dry seasons, the invention obtains the monthly maximum water consumption rate, monthly highest water level, monthly maximum inflow, and monthly maximum operating power generation output of the hydropower station in the three typical years of abundant, flat, and dry seasons.

[0036] S32. Based on the monthly maximum water consumption rate of hydropower stations in typical years (both wet and dry), calculate the monthly minimum power generation capacity of hydropower stations in typical years (both wet and dry), expressed as: in: For the hydroelectric power station in the Minimum power generation output per month For the hydroelectric power station in the The monthly ecological flow is a design parameter for hydropower stations and can be obtained from the design report. For stations with available data, the actual ecological flow value should be used. For stations without available data, the ecological flow should be determined based on the principle of ensuring the basic ecological function of the downstream river channel. Specifically, 10% of the hydropower station's multi-year average monthly flow should be used as the ecological flow. For the hydroelectric power station in the For power stations with a water level-water consumption rate curve, the maximum water consumption rate for the month is determined by interpolation based on the monthly water level of the optimization results for typical wet, dry, and wet years. If there is no water level-water consumption rate curve, the comprehensive water consumption rate of the power station is used.

[0037] S33. Based on the monthly highest water level, monthly maximum inflow, and monthly maximum operating power output of the hydropower station in typical years, obtain the monthly maximum theoretical power output of the hydropower station in typical years. Based on the monthly maximum theoretical power output and monthly maximum operating power output of the hydropower station in typical years, obtain the monthly maximum power generation capacity of the hydropower station in typical years.

[0038] Step S33 includes steps S331-S336, as follows: S331. Based on the monthly highest water level of the hydropower station in a typical year of high, low, and low water levels, the initial monthly reservoir capacity and the final monthly reservoir capacity of the hydropower station in a typical year of high, low, and low water levels are obtained by interpolating the water level-reservoir capacity curve.

[0039] S332. Based on the monthly maximum inflow, monthly initial reservoir capacity, and monthly final reservoir capacity of a hydropower station during a typical year of high, low, and low water levels, calculate the monthly maximum outflow of the hydropower station during a typical year of high, low, and low water levels, expressed as follows: in: For the hydroelectric power station in the Maximum outbound flow in a month For the hydroelectric power station in the Initial storage capacity for one month, For the hydroelectric power station in the The storage capacity at the end of the month, This is the conversion factor between storage capacity and flow rate. For the hydroelectric power station in the Maximum inbound volume in a month.

[0040] S333. Take the minimum value between the maximum monthly outflow from the reservoir and the maximum monthly inflow from the generator of the hydropower station in a typical year of abundant, flat, and dry conditions, to obtain the actual monthly power generation flow of the hydropower station in a typical year of abundant, flat, and dry conditions.

[0041] Specifically, the maximum monthly flow rate through the hydropower station is a design parameter obtained from the design report.

[0042] S334. Based on the actual monthly power generation flow of the hydropower station in typical years of abundant, flat and dry seasons, the monthly calculated power generation output of the hydropower station in typical years of abundant, flat and dry seasons is obtained by using the first calculation formula or the second calculation formula.

[0043] The first calculation formula is expressed as follows: in: For the hydroelectric power station in the Calculated power generation output over a month The output factor is a design parameter for the hydropower station, obtained from the design report. For the hydroelectric power station in the Actual power generation flow in a month For the hydroelectric power station in the The initial water level of the month, For the hydroelectric power station in the The water level at the end of the month, Maximum outbound flow The corresponding tailrace level was obtained from the power station's design data. For the hydroelectric power station in the Maximum outbound flow in a month For the hydroelectric power station in the Monthly head loss, hydropower station design parameters, obtained from the design report.

[0044] The second calculation formula is expressed as follows: in: For the hydroelectric power station in the Average water consumption rate per month.

[0045] Specifically, the average monthly water consumption rate is equal to the total monthly power generation divided by the total monthly water consumption for power generation.

[0046] S335. Take the minimum value between the monthly calculated power generation output of the hydropower station in a typical year of abundant, flat, and dry seasons and the upper limit of the monthly power generation output of the hydropower station, in order to obtain the maximum theoretical monthly power generation output of the hydropower station in a typical year of abundant, flat, and dry seasons.

[0047] S336. Take the maximum value between the monthly maximum theoretical power generation of the hydropower station and the monthly maximum operating power generation of the hydropower station in a typical year of abundant, flat, and dry conditions, to obtain the monthly maximum power generation capacity of the hydropower station in a typical year of abundant, flat, and dry conditions.

[0048] S34. Based on the monthly minimum and maximum monthly power generation capacity of hydropower stations in typical years of abundant, flat, and dry seasons, conduct a monthly power generation capacity assessment of hydropower stations.

[0049] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of the invention, and should be understood that the scope of protection of the invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical teachings disclosed in this invention without departing from the spirit of the invention, and these modifications and combinations are still within the scope of protection of this invention.

Claims

1. A method for evaluating the monthly power generation capacity of a hydropower station based on typical year optimization, characterized in that, Includes the following steps: Construct the objective function for maximizing the reliable power generation output of cascade hydropower stations and the objective function for maximizing the annual power generation of cascade hydropower stations, and couple them to construct the overall objective function of cascade hydropower stations; Based on the overall objective function of the cascade hydropower station, the stepwise optimization method is used to optimize the initial operation scheme of the cascade hydropower station in typical years of high, low, and low water levels, so as to obtain the optimized operation scheme of the cascade hydropower station in typical years of high, low, and low water levels. Based on the power generation optimization operation scheme of cascade hydropower stations in typical years of abundant, flat and dry seasons, the minimum monthly power generation capacity, the maximum monthly theoretical power generation output and the maximum monthly operating power generation output of the hydropower stations in typical years of abundant, flat and dry seasons are obtained. Based on the maximum monthly theoretical power generation output and the maximum monthly operating power generation output of the hydropower stations in typical years of abundant, flat and dry seasons, the maximum monthly power generation capacity of the hydropower stations in typical years of abundant, flat and dry seasons is obtained, so as to conduct a monthly power generation capacity assessment of the hydropower stations.

2. The method for evaluating the monthly power generation capacity of a hydropower station based on typical year optimization as described in claim 1, characterized in that, The overall objective function of a cascade hydropower station is expressed as: in: The total objective function value, To determine the sign of the maximum value, For calculating the time period number, This represents the total number of calculation periods within the year. For the cascade hydropower station in the first Power generation output for each calculation period The penalty coefficient is... For the first The unit step function for each calculation period, To maximize the power output of the cascade hydropower stations during the period of minimum power generation within the year. For the first The number of hours in each calculation period.

3. The method for evaluating the monthly power generation capacity of a hydropower station based on typical year optimization as described in claim 1, characterized in that, Based on the overall objective function of the cascade hydropower stations, a stepwise optimization method is used to optimize the initial operation scheme of the cascade hydropower stations in typical years of high, low, and low water levels, in order to obtain the optimized operation scheme of the cascade hydropower stations in typical years of high, low, and low water levels. The steps include: Determine the differential search step size for the stepwise optimization method; Based on the overall objective function of the cascade hydropower station and the initial operation scheme of the cascade hydropower station in typical years of abundant, flat and dry seasons, the initial trajectory of the step-by-step optimization method is determined by the simulation pre-optimization method. Based on the overall objective function of the cascade hydropower station and the differentiated search step size of the stepwise optimization method, the initial trajectory of the stepwise optimization method is optimized to obtain the power generation optimization operation scheme of the cascade hydropower station in typical years of abundant, flat and dry seasons.

4. The method for evaluating the monthly power generation capacity of a hydropower station based on typical year optimization as described in claim 3, characterized in that, Determining the differential search step size for the stepwise optimization method includes the following steps: Determine the differential search step size for the stepwise optimization method, including the initial differential search step size and the iterative differential search step size; The initial differential search step size for the stepwise optimization method is determined based on the regulation performance of the hydropower station, and is expressed as: in: For the first The initial differential search step size for each hydropower station, For the first The first hydropower station in The maximum allowable operating water level for each calculation period. For the first The first hydropower station in The minimum allowable operating water level for each calculation period. For the first The annual regulation capacity of each hydropower station, The annual adjustment capacity threshold, The coefficient of variation; The differentiated iterative search step size of the successive optimization method is determined based on the termination accuracy or total number of iterations, and is expressed as: in: For the first The first hydropower station Differentiated search step size in each iteration. This represents the change in the overall objective function value of the cascade hydropower stations. For iteration numbering, This represents the total number of iterations. The accuracy of the change in the overall objective function value of the cascade hydropower station.

5. The method for evaluating the monthly power generation capacity of a hydropower station based on typical year optimization as described in claim 1, characterized in that, Based on the optimized operation scheme of cascade hydropower stations in typical years (both wet and dry), the monthly minimum power generation capacity, monthly maximum theoretical power generation output, and monthly maximum operating power generation output of the hydropower stations in typical years are obtained. Then, based on the monthly maximum theoretical power generation output and monthly maximum operating power generation output of the hydropower stations in typical years, the monthly maximum power generation capacity of the hydropower stations in typical years is obtained to conduct a monthly power generation capacity assessment of the hydropower stations, including the following steps: Based on the power generation optimization operation scheme of cascade hydropower stations in typical years of high-yield, low-yield and low-yield, the monthly maximum water consumption rate, monthly maximum water level, monthly maximum inflow and monthly maximum power generation of hydropower stations in typical years of high-yield, low-yield and low-yield are obtained. Based on the monthly maximum water consumption rate of hydropower stations in typical years of abundant, flat and dry seasons, calculate the monthly minimum power generation capacity of hydropower stations in typical years of abundant, flat and dry seasons. Based on the monthly highest water level, monthly maximum inflow, and monthly maximum operating power output of the hydropower station during typical years of abundant, flat, and dry seasons, the monthly maximum theoretical power output of the hydropower station during typical years of abundant, flat, and dry seasons is obtained. Based on the monthly maximum theoretical power output and the monthly maximum operating power output of the hydropower station during typical years of abundant, flat, and dry seasons, the monthly maximum power generation capacity of the hydropower station during typical years of abundant, flat, and dry seasons is obtained. The monthly minimum and maximum power generation capacity of hydropower stations are used to assess the monthly power generation capacity of hydropower stations based on typical years of abundant, flat, and dry seasons.

6. The method for evaluating the monthly power generation capacity of a hydropower station based on typical year optimization as described in claim 5, characterized in that, Based on the monthly maximum water consumption rate of hydropower stations during typical years of high and low water availability, the monthly minimum power generation capacity of hydropower stations during typical years of high and low water availability is calculated and expressed as follows: in: For the hydroelectric power station in the Minimum power generation output per month For the hydroelectric power station in the Monthly ecological traffic For the hydroelectric power station in the Maximum water consumption rate per month.

7. The method for evaluating the monthly power generation capacity of a hydropower station based on typical year optimization as described in claim 5, characterized in that, Based on the monthly highest water level, monthly maximum inflow, and monthly maximum operating power output of the hydropower station during typical years of high, low, and low water levels, the monthly maximum theoretical power output of the hydropower station during typical years of high, low, and low water levels is obtained. Then, based on the monthly maximum theoretical power output and the monthly maximum operating power output of the hydropower station during typical years of high, low, and low water levels, the monthly maximum power generation capacity of the hydropower station during typical years of high, low, and low water levels is obtained, including the following steps: Based on the monthly highest water level of the hydropower station in a typical year of abundant, flat and dry seasons, the initial monthly reservoir capacity and the final monthly reservoir capacity of the hydropower station in a typical year of abundant, flat and dry seasons are obtained by interpolating the water level and reservoir capacity curve. Based on the monthly maximum inflow, monthly initial reservoir capacity, and monthly final reservoir capacity of the hydropower station in a typical year of abundant, flat, and dry seasons, calculate the monthly maximum outflow of the hydropower station in a typical year of abundant, flat, and dry seasons. The minimum value between the maximum monthly outflow from the reservoir and the maximum monthly inflow through the generator of the hydropower station in a typical year of abundant, flat, and dry conditions is used to obtain the actual monthly power generation flow of the hydropower station in a typical year of abundant, flat, and dry conditions. Based on the actual monthly power generation flow of hydropower stations in typical years of abundant, flat and dry seasons, the monthly calculated power generation output of hydropower stations in typical years of abundant, flat and dry seasons is obtained by using the first calculation formula or the second calculation formula. The first calculation formula is expressed as follows: in: For the hydroelectric power station in the Calculated power generation output over a month This is the output coefficient. For the hydroelectric power station in the Actual power generation flow in a month For the hydroelectric power station in the The initial water level of the month, For the hydroelectric power station in the The water level at the end of the month, Maximum outbound flow The corresponding tailwater level, For the hydroelectric power station in the Maximum outbound flow in a month For the hydroelectric power station in the Monthly head loss; The second calculation formula is expressed as follows: in: For the hydroelectric power station in the Average water consumption rate over the months; The minimum value between the monthly calculated power output of the hydropower station in a typical year of abundant, flat and dry conditions and the upper limit of the monthly power output of the hydropower station is used to obtain the maximum theoretical monthly power output of the hydropower station in a typical year of abundant, flat and dry conditions. The maximum monthly theoretical power generation of the hydropower station in a typical year of abundant, flat, and dry seasons is obtained by taking the maximum monthly operating power generation of the hydropower station.

8. The method for evaluating the monthly power generation capacity of a hydropower station based on typical year optimization as described in claim 7, characterized in that, Based on the monthly maximum inflow, initial reservoir capacity, and final reservoir capacity of a hydropower station during a typical year of high, low, and low water levels, the monthly maximum outflow is calculated and expressed as follows: in: For the hydroelectric power station in the Maximum outbound flow in a month For the hydroelectric power station in the Initial storage capacity for one month, For the hydroelectric power station in the The storage capacity at the end of the month, This is the conversion factor between storage capacity and flow rate. For the hydroelectric power station in the Maximum inbound volume in a month.

Images