Hydroelectric generating set peak regulation scheme economical efficiency comparison method and device and storage medium

Abstract

The invention discloses a hydropower unit peak regulation scheme economy comparison method and device and a storage medium, and the method comprises the steps: collecting an actual peak regulation scheme of a hydropower station, unit operation characteristic data and static parameters, and determining the basic parameters of a single unit after analysis; an optimal load distribution model based on dynamic planning is established, and a zero start-stop peak regulation scheme is solved for a fixed unit combination; the water consumption, depreciation cost and maintenance cost generated by starting and stopping of a primary unit in the actual peak regulation scheme are evaluated; the total water consumption of the actual peak regulation scheme and the zero-start-stop peak regulation scheme is calculated, the additional power generation water consumption of the zero-start-stop peak regulation scheme relative to the actual peak regulation scheme is determined, and the peak regulation cost of the two is evaluated; and judging whether the water consumption can meet the peak regulation duration requirement of the valley stable stage of the zero start-stop peak regulation scheme or not based on the water consumption corresponding to the actual peak regulation scheme in the valley stable stage and the equivalent power generation water consumption of the unit start-stop economic cost. The peak regulation strategy optimization in the electricity market environment is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reservoir power generation dispatching, and in particular to a water turbine unit peak shaving scheme economic comparison method, device and storage medium. BACKGROUND

[0002] With the deepening of the "double carbon" goal, clean energy represented by wind power and photovoltaic power has achieved rapid development and large-scale access to the power grid. However, the output power of wind power and photovoltaic power generation has significant randomness and intermittency, which is difficult to effectively respond to the dynamic fluctuations of power grid load. Therefore, in order to ensure the safety and stability of power grid operation, auxiliary power sources with good regulation performance need to be configured to participate in peak shaving.

[0003] Large hydropower stations have become an ideal supporting power source for wind power and photovoltaic power generation due to their excellent regulation performance and rapid response capability. The water-wind-solar multi-energy complementary mode significantly improves the stability and economy of new energy grid-connected operation, and has gradually become the mainstream trend of clean energy development. However, deep participation in new energy regulation changes the traditional operation mode of water turbine units, resulting in frequent start-stop and load adjustment of the units. This operation mode not only increases the mechanical loss of the units and shortens the service life of the equipment, but also significantly increases the work intensity of the on-site operation and maintenance personnel, and increases the difficulty and cost of operation and management.

[0004] Currently, there is little research on the cost and risk quantification of frequent start-stop of water turbine units, and the cost is difficult to accurately calculate in actual operation, the economic benefits are difficult to guarantee, which may affect the overall operation reliability of the power system. Therefore, it is of great practical significance to conduct in-depth quantitative analysis of the cost and risk of frequent start-stop of water turbine units. SUMMARY

[0005] In order to solve the above problems, the present application provides a water turbine unit peak shaving scheme economic comparison method, device and storage medium, which can provide accurate peak shaving cost quantification evaluation tools for large water turbine units participating in auxiliary service market, and help to optimize peak shaving strategy in power market environment.

[0006] The technical scheme adopted by the present application is as follows: A water turbine unit peak shaving scheme economic comparison method, comprising: Collecting actual peak shaving schemes of hydropower stations, unit operation characteristic data and static parameters, and determining the basic parameters of a single unit after analysis; Establishing an optimal load distribution model based on dynamic programming, solving the zero start-stop peak shaving scheme for fixed unit combination; evaluating the water consumption, depreciation cost and maintenance cost generated by the start-stop of a unit in the actual peak shaving scheme; Calculate the total water consumption of the actual peak regulation scheme and the zero start-stop peak regulation scheme, and determine the additional water consumption of power generation of the latter relative to the former; evaluate the peak regulation cost of the actual peak regulation scheme and the zero start-stop peak regulation scheme; Based on the water consumption corresponding to the actual peak regulation scheme in the low valley stable stage and the equivalent power generation water consumption of the economic cost of unit start-stop, it is judged whether the water consumption can meet the peak regulation time length demand of the zero start-stop peak regulation scheme in the low valley stable stage.

[0007] Further, the actual peak regulation scheme, unit operation characteristic data and static parameters of the hydropower station are collected, and the basic parameters of a single unit are determined after analysis, including: Collecting operation data and hydropower unit characteristic data of the hydropower station; Determining the service life of the hydropower unit of the hydropower station and the investment cost of a single hydropower unit; Processing the collected power station operation data into a unified time scale; Discretize the NHQ curve of the hydropower unit, set the output interval and the head interval; Discretize the upstream water level-storage capacity curve, set the water level discrete interval; Discretize the discharge-tailwater level curve, set the water level discrete interval.

[0008] Further, the operation data of the hydropower station includes reservoir water level data, original output data of each unit, power generation flow data and comprehensive electricity price of the electricity market; the characteristic data of the hydropower unit includes single machine installed capacity, unit no-load overcurrent curve and NHQ curve.

[0009] Further, the optimal load distribution model based on dynamic programming is established, and the zero start-stop peak regulation scheme is solved for fixed unit combination, including: Determine the economic operation optimization objective function of the hydropower station in the peak regulation period under the mode of water being determined by electricity, that is, the minimum total power generation water consumption of all hydropower units in the peak regulation period; Determine the constraint conditions, including active power balance constraint, unit output limit constraint, water balance constraint and unit climbing ability constraint; Solve the optimal load distribution model of the hydropower unit, take the unit number as the sequence, the number of units n as the stage variable, and the total output of n units as the state variable, and the load of the nth unit as the decision variable; according to the dynamic programming optimization principle, the forward recursion equation set is obtained according to the objective function at t period; Determine the initial period of the actual peak regulation scene in the number of running units, determine the initial upstream water level and the target output of each period in the peak regulation process, and take them as the model input, and obtain the zero start-stop peak regulation scheme through calculation.

[0010] Further, the evaluation of the actual peak regulation scheme includes the water consumption, depreciation cost and maintenance cost generated by the start-stop of a unit once, including: calculating the total water consumption of the unit start-up process, including the sum of the water consumption in the no-load running stage and the water consumption in the stage of lifting the output from zero to stable output; calculating the total water consumption of the unit shutdown process, including the sum of the water consumption in the no-load running stage and the water consumption in the process of reducing the output from the shutdown output to zero; based on the collected actual peak regulation scheme, unit operation characteristic data and static parameters, determining the service life of the water turbine to be studied and the initial investment cost of a single water turbine, and then calculating the depreciation cost of a single water turbine increased by daily start-stop; based on the proportion of the cost of a single water turbine, estimating the annual maintenance cost, and selecting the increase range of the maintenance cost, thereby estimating the maintenance cost of a single water turbine increased by daily start-stop.

[0011] Further, the calculation of the total water consumption of the actual peak regulation scheme and the zero start-stop peak regulation scheme determines the additional power generation water consumption of the latter relative to the former, including: determining the peak regulation scene, extracting the actual peak regulation scheme, taking the initial upstream water level of the peak regulation scene and the target output of each period as the input of the economic operation model of the hydropower station, making the zero start-stop peak regulation scheme, and determining the start-stop times of the water turbine in the actual peak regulation scheme according to the operation data of the unit participating in the peak regulation in the actual peak regulation scheme; calculating the no-load water consumption generated by the water turbine according to the start-stop times of the water turbine in the actual peak regulation scheme; summing up the power generation flow of all units in each period in the actual peak regulation scheme to obtain the total power generation water consumption, and then obtaining the water consumption generated by the actual peak regulation scheme; summing up the power generation flow of all units in each period in the zero start-stop peak regulation scheme to obtain the total power generation water consumption, thereby obtaining the water consumption generated by the zero start-stop peak regulation scheme; determining the additional water consumption generated by the zero start-stop peak regulation scheme compared with the actual peak regulation scheme.

[0012] Further, the evaluation of the actual peak regulation scheme and the zero start-stop peak regulation scheme includes the peak regulation cost, including: calculating the depreciation and maintenance cost generated by the start-stop of the water turbine in the actual peak regulation scheme according to the start-stop times of the water turbine in the actual peak regulation scheme, the depreciation cost and the maintenance cost of a single water turbine increased by daily start-stop; regarding the additional water consumption generated by the zero start-stop peak regulation scheme compared with the actual peak regulation scheme as the power generation potential lost under the condition of the initial water head and the optimal output of the unit in the peak regulation period, calculating the power loss, and combining the electricity market price to calculate the peak regulation cost of the zero start-stop peak regulation scheme; Compare the actual peak shaving scheme and the zero start-stop peak shaving scheme to select the scheme with the highest economic benefit.

[0013] Further, the water consumption corresponding to the actual peak shaving scheme in the low valley stable stage is equivalent to the water consumption of generating electricity, and the economic cost of unit start-stop is determined. Determine the total water consumption of the actual peak shaving scheme in the output stable stage; the output stable stage includes: in the peak shaving low valley stage, the total output of the power station is small within the preset range Fluctuation and maintain thermal stability; Determine the water consumption of generating electricity corresponding to the economic cost of unit start-stop of the actual peak shaving scheme, the average output and the average total power generation flow of the whole unit in the actual peak shaving scheme in the peak shaving low valley stable stage;Under the conditions of the initial water head in the actual peak shaving period and the average output and average power generation flow in this stage, determine the water consumption of generating electricity corresponding to the additional economic cost of unit start-stop; Determine the average power generation flow of the whole unit in the peak shaving low valley stable stage of the zero start-stop peak shaving scheme; According to the water consumption corresponding to the actual peak shaving scheme in the peak shaving low valley stable stage and the water consumption of generating electricity equivalent to the economic cost of unit start-stop, the running time and the total time of the zero start-stop peak shaving scheme in the peak shaving low valley stable stage are calculated, if the running time is greater than or equal to the total time, the actual peak shaving scheme in the peak shaving low valley stage can be replaced by the zero start-stop peak shaving scheme;Otherwise, it cannot be replaced.

[0014] A computer device comprises a memory and a processor, the memory stores a computer program, and the processor realizes the water turbine unit peak shaving scheme economic comparison method when executing the computer program.

[0015] A computer readable storage medium stores a computer program, and the computer program is executed by a processor to realize the water turbine unit peak shaving scheme economic comparison method.

[0016] The beneficial effects of the present application are: 1、The present application establishes an optimal load distribution model based on dynamic programming algorithm, takes the number of running units in the initial period of the actual peak shaving scheme and the target output of the peak shaving process as the model input, and solves the zero start-stop peak shaving scheme.

[0017] 2, The application determines the extra power generation water consumption of the zero start-stop peak regulation scheme compared with the actual peak regulation scheme by calculating the total water consumption of the actual peak regulation scheme and the zero start-stop peak regulation scheme, converts the extra water consumption into the maximum power generation of a single hydropower unit and the corresponding economic loss. By comparing the peak regulation costs of the actual peak regulation scheme and the zero start-stop scheme, the peak regulation scheme with the minimum peak regulation cost is selected. The longest feasible time of the output valley "stable stage" of the zero start-stop peak regulation scheme is determined by calculating the economic operation time corresponding to the peak regulation cost of the actual peak regulation scheme.

[0018] 3, The decision-making method based on economic sustainable time evaluation of the application compared with the existing peak regulation strategy helps the power station to reduce the number of unit start-stop, reduce the operation risk, and more flexibly control the peak regulation cost, striving to achieve the balance between economic benefit and operation safety. At the same time, this refined cost analysis also provides a more reliable peak regulation cost estimation basis for the power station participating in the auxiliary peak regulation market competition. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a water power unit peak regulation scheme economic comparison method flow chart of embodiment 1 of the application.

[0020] Figure 2 is the operation characteristic curve of the unit of a certain hydropower station in embodiment 2 of the application.

[0021] Figure 3 is the total output curve of the power station in a certain peak regulation scheduling period in embodiment 2 of the application.

[0022] Figure 4 is the output curve of each unit of the actual peak regulation scheme in embodiment 2 of the application.

[0023] Figure 5 is the output curve of each unit of the zero start-stop peak regulation scheme in embodiment 2 of the application. DETAILED DESCRIPTION

[0024] In order to have a more clear understanding of the technical features, purposes and effects of the application, the specific embodiments of the application will be described. It should be understood that the specific embodiments described herein are only used to explain the application and are not used to limit the application, that is, the described embodiments are only a part of the embodiments of the application, but not all the embodiments. Based on the embodiments of the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0025] Embodiment 1 The embodiment provides a water-turbine-generator-unit peak regulation scheme economy comparison method, including: collecting actual peak regulation schemes of a hydropower station, unit operation characteristic data and static parameters, and determining basic parameters of a single unit after analysis; establishing an optimal load distribution model based on dynamic programming, and solving a zero-start-stop peak regulation scheme for a fixed unit combination; evaluating water consumption, depreciation cost and maintenance cost generated by unit start-stop in the actual peak regulation scheme; calculating total water consumption of the actual peak regulation scheme and the zero-start-stop peak regulation scheme, and determining additional power generation water consumption of the latter relative to the former; evaluating peak regulation costs of the actual peak regulation scheme and the zero-start-stop peak regulation scheme; based on equivalent power generation water consumption of water consumption corresponding to a stable stage in a low valley of the actual peak regulation scheme and unit start-stop economic cost, judging whether the equivalent water consumption can meet peak regulation time length demand of the stable stage in the low valley of the zero-start-stop peak regulation scheme.

[0026] Specifically, as shown in the figure, Figure 1 The embodiment method can be implemented by the following steps: S1, collecting and arranging actual peak regulation schemes of a hydropower station, unit operation characteristic data and static parameters, and determining basic parameters such as design service life and initial investment cost of a single unit after analysis; S2, establishing an optimal load distribution model based on dynamic programming, and solving a zero-start-stop peak regulation scheme for a fixed unit combination; S3, evaluating water consumption, depreciation cost and maintenance cost generated by unit start-stop in the actual peak regulation scheme; S4, calculating total water consumption of the actual peak regulation scheme and the zero-start-stop peak regulation scheme, and determining additional power generation water consumption of the latter relative to the former; S5, evaluating peak regulation costs of the actual peak regulation scheme and the zero-start-stop peak regulation scheme; S6, based on equivalent power generation water consumption of water consumption corresponding to a stable stage in a low valley of the actual peak regulation scheme and unit start-stop economic cost, judging whether the equivalent water consumption can meet peak regulation time length demand of the stable stage in the low valley of the zero-start-stop peak regulation scheme.

[0027] Preferably, step S1 specifically includes the following steps: S11, collecting operation data of the hydropower station, including reservoir water level data, original output data of each unit, power generation flow data, comprehensive electricity price of the electricity market , water-turbine-generator-unit characteristic data, including single-machine installed capacity, unit no-load overcurrent curve and output-head-flow NHQ curve; S12, determining service life of the water-turbine-generator-unit of the hydropower station and investment cost of a single water-turbine-generator-unit; S13, processing the collected power station operation data into a unified time scale ; S14, discretize the unit NHQ curve, the output interval can be set to 10MW, and the water head interval can be set to 1m; S15, discretize the upstream water level-storage capacity curve, the water level discrete interval can be set to 1m; S16, discretize the discharge-tailwater level curve, the water level discrete interval can be set to 1m.

[0028] Preferably, the optimal load distribution model based on the dynamic programming algorithm is established in step S2, and the specific steps for solving the zero start-stop peak shaving scheme for the fixed unit combination are as follows: S21, determine the economic operation optimization objective function of the plant during the peak shaving period in the electricity determines the water mode as:

[0029] Wherein, is the peak shaving period T , the minimum total power generation water consumption of the hydroelectric unit, is t the output of the n th unit during the period, is t the net water head during the period, is t the corresponding power generation flow of the n th unit during the period under the conditions of water head and output .

[0030] S22, determine the constraint conditions, including: ① active power balance constraint ; ② unit output limit constraint ; ③ water balance constraint ; ④ unit ramping capability constraint ; Wherein, is the target total output of the hydroelectric unit during the period; and represent the minimum and maximum output of the th unit, respectively; and are and the storage capacity of the upstream reservoir at the end of the period; and are the inflow and total discharge of the power station during the th period, respectively; represents the time interval of adjacent periods; and represent the maximum negative and positive ramping capability of the unit, respectively.

[0031] S23, solving the in-plant unit load distribution model, taking the unit number as the sequence, the number of units as the stage variable, the total output of the unit as the state variable, and the load of the unit as the decision variable; according to the dynamic programming optimization principle, the objective function in the time period can be obtained as follows:

[0032] wherein, represents the total load of the unit; represents the total load of the unit; represents the total load of the unit;

[0033] S24, determining the initial time period of the actual peak regulation scenario, the number of operating units , the initial upstream water level , the target output of each time period in the peak regulation process , both of which are used as model inputs, and the zero start-stop peak regulation scheme is obtained after calculation.

[0034] More preferably, the specific steps of the model solving process in step S24 are as follows: S241, through the initial upstream water level and the upstream water level-storage capacity curve, the initial upstream reservoir water storage capacity is inversely deduced by linear interpolation; S242, presetting the initial time period power generation flow , combining the discharge flow-tail water level curve to obtain the initial time period tail water level , water head ; S243, given the number of operating units , the initial time period water head and the target output , as model inputs, the optimal load distribution scheme and the corresponding power generation flow under the water head are solved; S244, judging whether the error of and satisfies the set precision, if yes, turning to step S245, otherwise, the preset power generation flow , go back to step S242 to recalculate; S245, after the load distribution of the last period is completed, the reservoir capacity of the initial upstream reservoir in the next period , wherein the period , represents the total reservoir capacity of the peak regulation scenario , combined with the upstream water level-capacity curve, the upstream water level of the next period is obtained by linear interpolation ; wherein represents the upstream reservoir storage capacity in the period , represents the upstream reservoir inflow in the period , represents the total discharge flow of the power station in the period , represents the time interval of adjacent periods S246, the preset power generation flow in the next period is obtained by linear interpolation combined with the discharge flow-tail water level curve , and the tail water level of the period is , and the water head ; S247, given the number of operating units , the water head in the period and the target output , as model input, the optimal load distribution scheme under the water head and the corresponding power generation flow are solved ; S248, determine whether the error of and satisfies the set precision, if it satisfies, go to S249, otherwise, the preset power generation flow in the period , go back to step S246 to recalculate ; S249, if , the load distribution of all periods in the peak regulation scenario is completed, that is, the zero start-stop peak regulation scheme is completed, otherwise, go to step S245 .

[0035] Preferably, the water consumption, depreciation cost and maintenance cost generated by the start-stop of the unit in the actual peak regulation scheme are calculated in step S3, and the specific steps are as follows: S31, the starting process of the hydroelectric generating set can be generally divided into two stages: ① the unit no-load running stage; ② the unit output gradually increases from zero to the stable output stage. Among them, "stable output" refers to the maximum output that the unit can maintain after starting and reaching the thermal stable running state under the given water head condition. After that, the actual output of the unit fluctuates slightly around this level and basically remains stable. Therefore, the total water consumption of the unit starting process is the sum of the water consumption of the unit no-load running stage and the water consumption of the unit output from zero to the stable output stage. , wherein, is the total water consumption generated by the primary hydroelectric generating set during the starting process, is the water consumption of the primary hydroelectric generating set during the no-load running stage, is the water consumption generated by the primary hydroelectric generating set during the process of output from zero to the stable output stage.

[0036] S32, define the shutdown process of the hydroelectric generating set as: the unit output gradually decreases from the "shutdown output" value corresponding to the upper boundary of the prohibited running area under the current water head to zero and experiences the no-load running stage. The total water consumption of the unit shutdown process is the sum of the water consumption of the no-load running stage and the water consumption during the process of output from "shutdown output" to zero. , wherein, is the total water consumption generated by the primary hydroelectric generating set during the shutdown process; is the water consumption of the primary hydroelectric generating set during the no-load running stage; is the water consumption generated by the primary hydroelectric generating set during the process of output from the shutdown output to zero.

[0037] S33, according to the information collected in step S1, combined with the consideration of operation economy and safety, determine the service life of the hydroelectric generating set to be studied According to existing research results, if the unit is started and stopped once a day for a long time, the overall life of the unit may be shortened by 10%-20% cumulatively.

[0038] S34, according to the information collected in step S1, determine that the initial investment cost of a single hydroelectric generating set is about , then the cost of a single hydroelectric generating set started and stopped once a day is Assuming that the hydroelectric generating set participates in frequent peak shaving starting and stopping operation every day for a long time, conservatively estimate that the overall life of the unit is shortened , then the increased depreciation cost of a single hydroelectric generating set due to starting and stopping once a day is , wherein, is the cost of a single hydroelectric generating set started and stopped once a day, is the increased depreciation cost of a single hydroelectric generating set due to starting and stopping once a day.

[0039] S35. Frequent start-ups and shutdowns of hydropower units significantly increase wear on mechanical components, leading to increased maintenance and replacement frequency for mechanical, electrical, and lubrication systems. Existing research indicates that annual maintenance costs for hydropower stations are generally estimated at 1% to 2% of the initial investment or construction cost. Based on a principle of prudence, this embodiment uses a percentage of the cost per hydropower unit. Estimate annual maintenance costs, selecting an increase in maintenance costs of [percentage missing]. Therefore, it is estimated that the increased maintenance cost of starting and stopping a single hydropower unit once a day is approximately ,in, The increased maintenance costs due to starting and stopping a single hydropower unit once a day.

[0040] Preferably, in step S4, the total water consumption of the actual peak-shaving scheme and the zero-start-stop peak-shaving scheme is calculated. The specific steps are as follows: S41, Determine the peak-shaving scenario, extract the actual peak-shaving scheme, and set the initial upstream water level of the peak-shaving scenario. The target output for each time period is used as input to the plant's economic operation model to create a zero-start-stop peak-shaving scheme. Based on the operating data of the units participating in peak shaving in the actual peak-shaving scheme, the number of start-ups and shutdowns of the hydropower units in the actual peak-shaving scheme is determined. .

[0041] S42, based on the actual peak-shaving scheme, the number of start-ups and shutdowns of hydropower units. Calculate the no-load water consumption of the hydropower unit. ,in, This refers to the idle water consumption of hydropower units during actual peak shaving. This refers to the no-load water consumption of the hydropower unit during a single start-up process in the actual peak-shaving operation. This refers to the no-load water consumption generated during the actual peak-shaving process when all hydropower units are shut down.

[0042] S43, summarizing the power generation flow of all units in each time period of the actual peak-shaving scheme to obtain the total power generation water consumption:

[0043] The actual water consumption generated by the peak-shaving scheme is:

[0044] in, The actual peak-shaving scheme during peak-shaving periods T Inside The total water consumption for power generation of the Taiwan hydroelectric generator unit yes t Time period n The output of Unit 1 for t The head of the water-powered unit during the time period, yest Time period n Unit 1 at the water head , contribute Power generation flow under the conditions, This is the total water consumption of the actual peak-shaving scheme. This refers to the idle water consumption of hydropower units during actual peak shaving.

[0045] S44, summarizing the power generation flow of all units in each time period under the zero start-stop peak shaving scheme to obtain the total power generation water consumption:

[0046] The water consumption generated by the zero-start-stop peak shaving scheme is ; in, The actual peak-shaving scheme during peak-shaving periods T Inside The total water consumption for power generation of the Taiwan hydroelectric power unit yes t Time period n The output of Unit 1 for t The water head during the period, yes t Time period n Unit 1 at the water head , contribute Power generation flow under the conditions, This is the total water consumption of the zero-start-stop peak-shaving scheme.

[0047] S45, determine the additional water consumption of the zero-start-stop peak-shaving scheme compared to the actual peak-shaving scheme. ,in, This is the total water consumption of the zero-start-stop peak-shaving scheme. This is the total water consumption of the actual peak-shaving scheme. This refers to the additional water consumption generated by the zero-start-stop peak shaving scheme compared to the actual peak shaving scheme.

[0048] Preferably, in step S5, the peak-shaving costs of the actual peak-shaving scheme and the zero-start-stop peak-shaving scheme are calculated. The specific steps are as follows: S51, based on the actual peak-shaving scheme, the number of start-ups and shutdowns of hydropower units. The increased depreciation cost of a single hydropower unit due to daily start-up and shutdown and maintenance costs Calculate the depreciation and maintenance costs of the actual peak-shaving scheme due to the start-up and shutdown of hydropower units. ,in It is the peak-shaving cost of the actual peak-shaving scheme.

[0049] S52. In short-term scheduling of large hydropower stations, due to the large reservoir capacity, the impact of the increased power generation water consumption of the zero-start-stop peak-shaving scheme on the upstream reservoir capacity compared to the actual peak-shaving scheme can be ignored. This additional water consumption can be... Considered as the initial head during peak shaving period and the optimal output of the unit The power generation potential lost under the given conditions is calculated to obtain the power loss. Combined with electricity market prices The economic loss was calculated. ,in, This refers to the peak-shaving cost of the zero-start-stop peak-shaving solution.

[0050] S53. Compare the peak-shaving costs of the actual peak-shaving scheme and the zero-start-stop peak-shaving scheme, and select the scheme with the highest economic benefits. (The economic difference in peak-shaving cost is not specified.) ,like Choose the actual peak-shaving scheme, if If a zero-start-stop peak-shaving scheme is selected, Choose the zero-start-stop peak-shaving scheme.

[0051] More preferably, the specific steps for calculating the power generation potential of the zero-start-stop peak-shaving scheme's additional water consumption in step S52 are as follows: S521, the preset optimal output of the unit is the maximum output of the unit, that is... Initial water head during peak shaving period The additional water consumption of the zero-start-stop peak-shaving scheme Given the conditions, query the NHQ table to find the corresponding power generation flow rate of the unit. Unit uptime Maximum power generation of the unit ,in The unit is at the water head Maximum output At the head of the water Unit output and water consumption The unit's uptime under these conditions At the head of the water Unit output and water consumption Maximum power generation of the unit under the given conditions; S522, at Shuitou Below, query the output at the upper boundary of the vibration zone of the hydropower unit. ,like Then update the optimal output of the unit. Otherwise, proceed to step S525, where... It is the output interval of the NHQ meter unit; S523, initial head during peak shaving period The zero-start-stop peak-shaving scheme consumes additional water. Given the conditions, query the NHQ table to find the corresponding power generation flow rate of the unit. Unit uptime The generating capacity of the unit ,in At the head of the water Unit output and water consumption The unit's uptime under these conditions At the head of the water Unit output and water consumption Power generation capacity of the unit under the following conditions; S524, if Then update , Proceed to step S522, where, It is at the head of the water Unit output and water consumption Maximum power generation of the unit under the given conditions At the head of the water Unit output and water consumption Power generation capacity of the unit under the following conditions; S525, iteration complete, found the maximum power generation potential of the zero-start-stop peak shaving scheme in terms of additional water consumption. .

[0052] Preferably, in step S6, the calculation of whether the water consumption corresponding to the "stable phase" of the peak-shaving valley in the actual peak-shaving scheme and the water consumption of power generation equivalent to the economic cost of unit start-up and shutdown can meet the peak-shaving duration requirement of the "stable phase" of the peak-shaving valley in the zero-start-stop peak-shaving scheme is as follows: S61, determine the total water consumption during the "stable phase" of the actual peak-shaving scheme. :

[0053] The "stable output phase" is defined as follows: during peak and off-peak periods, the total output of the power plant fluctuates slightly within a certain range and remains thermally stable. This refers to the total water consumption during the "stable phase" of the actual peak-shaving scheme. It is the total number of periods during the "stable phase" of peak shaving and trough. It is a certain period of the "stable phase" during peak and off-peak seasons. Is The water head corresponding to the hydropower unit during the specified time period. Is The output of the hydropower unit during the specified time period Is Time period, water head , contribute The corresponding total power generation flow, It is the time interval between adjacent time periods. This refers to the no-load water consumption of the generating units during the actual peak-shaving process due to unit start-up and shutdown. It is the water consumption for power generation corresponding to the additional economic costs incurred by the start-up and shutdown of the generating unit.

[0054] S62, Determine the economic cost of unit start-up and shutdown for the actual peak-shaving scheme. Corresponding water consumption for power generation The average output of all units during the "stable phase" of the actual peak-shaving scheme:

[0055] Average total power generation flow:

[0056] Initial head during actual peak shaving period and average output during this stage Average power generation flow Under these conditions, the additional economic costs of unit start-up and shutdown The corresponding water consumption for power generation is:

[0057] in, It is the economic cost of starting and stopping the unit. It is the equivalent water consumption for power generation at the economic cost of starting and stopping the generating unit. It is the total number of periods during the "stable phase" of peak shaving and trough. It refers to a certain period during the "stable phase" of peak shaving and trough. Is The water head corresponding to the hydropower unit during the specified time period. Is The output of the hydropower unit during the specified time period Is Time period, water head , contribute The actual power generation flow during the "stable phase" of peak shaving and valley operation. It is the average power generation flow during the actual peak-shaving and off-peak "stable phase".

[0058] S63, determine the average power generation flow of all units during the "stable phase" of the zero-start-stop peak-shaving scheme:

[0059] in, It is the average power generation flow of all units during the "stable phase" of the peak shaving off-peak period under the zero-start-stop peak shaving scheme. It is the total number of periods during the "stable phase" of peak shaving and trough. It refers to a certain period during the "stable phase" of peak shaving and trough. Is The water head corresponding to the hydropower unit during the specified time period. Is The output of the hydropower unit during the specified time period Is Time period, water head , contribute The power generation flow corresponding to the "stable phase" of peak and off-peak periods.

[0060] S64. Based on the water consumption corresponding to the "stable phase" of peak shaving in the actual peak shaving scheme and the water consumption for power generation equivalent to the economic cost of unit start-up and shutdown, calculate the operating time of the "stable phase" of the zero-start-stop peak shaving scheme during the peak shaving period. Total duration of the "stable phase" during peak shaving and trough periods ,like In practice, peak-shaving schemes can be replaced by zero-start-stop peak-shaving schemes during off-peak periods, but not vice versa. This refers to the water consumption during the "stable phase" of the peak-shaving off-peak period in the actual peak-shaving scheme, and the operating time during the "stable phase" of the zero-start-stop peak-shaving scheme, corresponding to the economic cost of unit start-up and shutdown. This refers to the total water consumption corresponding to the "stable phase" of the actual peak-shaving scheme during the off-peak period. It is the average power generation flow of all units during the "stable phase" of the peak shaving off-peak period under the zero-start-stop peak shaving scheme. It is the total duration of the actual peak-shaving and trough "stable phase".

[0061] In the description of this application, it should be noted that the service life of the hydropower unit... The determination of the cost needs to be based on a comprehensive assessment of the hydropower unit manufacturer's recommendations and the actual condition of the unit; while the initial investment cost of a single hydropower unit... It depends on the specific hydropower station.

[0062] Example 2 This embodiment is based on embodiment 1: This embodiment provides a method for comparing the economic efficiency of peak-shaving schemes for hydropower units. Taking a power station as an example, this method will be described in detail.

[0063] In this embodiment, the service life of the hydroelectric generator unit is... The determination of the cost needs to be based on a comprehensive assessment of the hydropower unit manufacturer's recommendations and the actual condition of the unit; while the initial investment cost of a single hydropower unit... It depends on the specific hydropower station. The actual operating conditions and models of the generating units in different hydropower stations will affect the service life of the hydropower units. The initial investment cost of a single hydroelectric generating unit The specific data varies and is discussed according to the actual situation.

[0064] The unit information of the power station in this embodiment is as follows: Table 1 - Hydroelectric power station unit output characteristic parameters

[0065] wherein, Hmin is the minimum operating water head, Hmax is the maximum operating water head, Pmin is the minimum output of the unit, Pmax is the maximum output of the unit.

[0066] Figure 2 is the operating characteristic curve of the unit of the power station, and this embodiment only provides the operating characteristic curve of part of the unit and the NHQ characteristic curve data of part of the unit. The horizontal axis is the output (MW), and the vertical axis is the water head (m). The specific data is shown in Table 2.

[0067] Table 2 - NHQ characteristic curve data of a unit of a power station

[0068] The unit characteristic data and actual operation data collected from the power station are summarized and arranged, and a primary peak shaving scenario is extracted from the actual operation scenario. The total output curve of the power station during the peak shaving scheduling period is shown in Figure 3 . The peak shaving duration is 3 hours, the peak shaving depth is 1392.72 MW, a total of 6 units participate in peak shaving, and the process includes the start and stop operation of 1 unit. The specific data (partially) is shown in Table 3: Table 3 - Peak shaving case of a power station on October 18, 2023

[0069] The peak shaving process summarized and arranged by the method of this embodiment is calculated as follows: The power station peak shaving output data in Table 3, the corresponding upstream water level of the peak shaving initial period and the number of running units are used as the input of the optimal load distribution model, combined with the static operation data of the power station (upstream water level - reservoir capacity curve, downstream flow - tail water level curve), and the zero start-stop peak shaving scheme is made according to the related steps of step S2. The unit output of the actual peak shaving scheme and the zero start-stop peak shaving scheme is shown in Table 4, Table 5, and the output curve is shown in Figure 4 , Figure 5 .

[0070] Table 4 - Unit operation data of the actual peak shaving scheme

[0071] Table 5 - Zero start-stop peak shaving scheme unit operation data

[0072] According to the calculation method of the water consumption, depreciation cost and maintenance cost generated by the start-stop of the unit in the actual peak shaving scheme according to the embodiment, the specific process is as follows: According to the collected power station operation rules, relevant information and actual operation data, the process of starting and stopping the hydroelectric unit needs 5 minutes of no-load operation time, and the no-load flow corresponding to this case is 100 m³ / s. The no-load water consumption of the starting process can be calculated by the following formula , and the no-load water consumption of the stopping process is .

[0073] (1) (2) The service life of the hydroelectric unit is years, the initial investment cost of a single hydroelectric unit is about 100 million yuan, and the hydroelectric unit participates in the peak shaving start-stop operation frequently every day, and the overall service life of the unit is conservatively estimated to be shortened by ; then the increased depreciation cost of a single hydroelectric unit for starting and stopping once a day is: (3) By introducing the related data, the increased depreciation cost of the unit in the embodiment for starting and stopping once is 1.38 thousand yuan.

[0074] According to the proportion of the cost of a single hydroelectric unit in the embodiment , the increase range of the maintenance cost is selected as , then the increased maintenance cost of a single hydroelectric unit for starting and stopping once a day is: (4) By introducing the related data, the increased maintenance cost of the unit in the embodiment for starting and stopping once is 0.55 thousand yuan.

[0075] According to the calculation of the total water consumption of the actual peak shaving scheme and the zero start-stop peak shaving scheme according to the embodiment, the additional water consumption generated by the zero start-stop peak shaving scheme compared with the actual peak shaving scheme is determined, and the specific process is as follows: ① The total water consumption of the actual peak shaving scheme is : (5) The number of times of starting and stopping the hydroelectric unit in the actual peak shaving scheme of the embodiment is , The no-load water consumption is calculated according to the following formula: (6) In the actual peak-shaving scheme, the total water consumption for power generation is calculated based on the power generation flow of all units in each time period using the following formula: (7) ② Total water consumption of the zero-start-stop peak-shaving scheme : (8) The total water consumption for power generation is calculated based on the following formula for the power generation flow rate of all units in each time period under the zero start-stop peak shaving scheme: (9) in, This is the total water consumption generated by the actual peak-shaving scheme. This refers to the idle water consumption of hydropower units during actual peak shaving. This is the total water consumption for power generation under the actual peak-shaving scheme. This refers to the no-load water consumption of the hydropower unit during a single start-up process. This refers to the no-load water consumption generated during the shutdown process of all hydropower units. This refers to the number of times hydropower units are started and stopped in the actual peak-shaving scheme. yes t Time period n The output of Unit 1 for t The water head during the period, yes t Time period n Unit 1 at the water head , contribute Power generation flow under the conditions, This is the total water consumption of the zero-start-stop peak-shaving scheme. This represents the total water consumption for power generation under the actual peak-shaving scheme.

[0076] Table 6 - Actual Peak Shaving - Zero Start-Stop Peak Shaving Power Generation Flow

[0077] It is evident that the zero-start-stop peak-shaving scheme generates additional water consumption compared to the actual peak-shaving scheme. The value is 22,200 m³.

[0078] The specific process for evaluating the peak-shaving costs of actual peak-shaving schemes and zero-start-stop peak-shaving schemes involved in this embodiment is as follows: ① Actual peak-shaving scheme: Depreciation and maintenance costs incurred during the start-up and shutdown of hydropower units: (10) There is 1 water turbine start-stop in this embodiment, namely , , 100000 yuan.

[0079] ② Zero start-stop peak regulation scheme: In the short-term scheduling of large hydropower stations, due to the large reservoir capacity, the influence of the additional water consumption of the zero start-stop peak regulation scheme on the upstream reservoir capacity compared with the actual peak regulation scheme can be ignored, and the additional water consumption is considered as the power generation potential lost at the initial water head m and the optimal output of the unit , the power loss is calculated, combined with the electricity market price , the economic loss is calculated, wherein is the peak regulation cost of the zero start-stop peak regulation scheme. The specific process is as follows: Step a: preset the optimal output of the unit as the maximum output of the unit, that is , at the initial water head of the peak regulation period, the additional water consumption of the zero start-stop peak regulation scheme is , under the given conditions, query the NHQ table, the corresponding power generation flow of the unit is , the unit can run for , and the maximum power generation of the unit is , wherein is the maximum output of the unit at the water head , is the running time of the unit under the water head and the water consumption , and is the maximum power generation of the unit under the water head and the water consumption ; Step b: at the water head , query the upper boundary output of the vibration zone of the hydropower unit , if , update the optimal output of the unit , otherwise, step e; Step c: at the initial water head of the peak regulation period, the additional water consumption of the zero start-stop peak regulation scheme is , under the given conditions, query the NHQ table, the corresponding power generation flow of the unit is , the unit can run for , and the unit can generate power , wherein is the running time of the unit under the water head and the water consumption , is the power generation capacity of the unit under the water head , water consumption condition; Step d: if , update , , and go to step b, wherein, is the maximum power generation capacity of the unit under the water head , water consumption condition, is the power generation capacity of the unit under the water head , water consumption condition; Step e: iteration is ended, and the maximum power generation potential of the additional water consumption of the zero start-stop peak regulation scheme is found .

[0080] For this embodiment, the additional water consumption of the zero start-stop peak regulation scheme is 22,000 m³, and the initial water head during the peak regulation period is 147.58 m, corresponding to the optimal output of the unit of 840 MW. Combined with the additional water consumption and the electricity price of the zero start-stop peak regulation scheme, the economic loss caused by the zero start-stop peak regulation scheme can be calculated, and the specific results are shown in Table 7.

[0081] Table 7-Economic loss statistics table

[0082] In this embodiment, the zero start-stop peak regulation scheme can significantly reduce the depreciation fee and operation and maintenance cost of the power station, and has good economic benefits; and the start-stop operation of one unit is avoided, and the operation risk is reduced.

[0083] According to the equivalent power generation water consumption of the water consumption and the economic cost of the unit start-stop of the “stable stage” corresponding to the peak regulation low valley in the actual peak regulation scheme, whether the peak regulation time length demand of the zero start-stop peak regulation scheme in the “stable stage” of the peak regulation low valley can be met, and the specific process is as follows: ① Determine the total water consumption of the output “stable stage” of the actual peak regulation scheme , the output “stable stage” is defined: in the peak regulation low valley stage, the total output of the power station fluctuates within a certain range and maintains thermal stability.

[0084] (11) ② Determine the total power generation flow of the peak regulation output “stable stage” of the actual peak regulation scheme .

[0085] (12) , wherein is the total number of time periods of the “stable stage” of the peak regulation low valley, is the water consumption of the “stable stage” of the peak regulation low valley in a certain time period, is the water head corresponding to the water power unit at the time period, is the output corresponding to the water power unit at the time period, is the water head corresponding to the water power unit at the time period, is the output corresponding to the water power unit at the time period, is the time interval of adjacent time periods, is the no-load water consumption of the unit due to unit start-stop in the actual peak regulation scheme process.

[0086] ③Determine the economic cost of unit start-stop in the actual peak regulation scheme equivalent power generation water consumption : (13) wherein the average output of the actual peak regulation scheme in the peak regulation valley "stable stage" is the average power generation flow of the whole unit .

[0087] ④Determine the average power generation flow of the zero-start-stop peak regulation scheme in the peak regulation valley "stable stage" : (14) wherein, is the total number of time periods in the peak regulation valley "stable stage", is a time period in the peak regulation valley "stable stage", is the water head corresponding to the water power unit at the time period, is the output corresponding to the water power unit at the time period, is the water head corresponding to the water power unit at the time period, is the output corresponding to the water power unit at the time period,

[0088] ⑤Calculate the power generation water consumption corresponding to the water consumption and the new economic cost due to unit start-stop in the actual peak regulation scheme , so that the zero-start-stop peak regulation scheme in the peak regulation valley "stable stage" can run for : (15) Calculate the economic sustainable running time of the zero-start-stop peak regulation scheme in the valley "stable stage" of the present embodiment, as shown in Table 8.

[0089] ​​​​​​​​Table 8 - Economic sustainable running time

[0090] The results of Table 8 show that the economic running time corresponding to the start-stop cost of a single unit in the embodiment is sufficient to support the zero start-stop peak shaving scheme in the valley phase.

[0091] In summary, the method determines the longest feasible time of the zero start-stop peak shaving scheme by calculating the economic running time of low output. Compared with existing peak shaving strategies, the decision-making method based on economic sustainable time evaluation helps the power station to reduce the number of unit start-stop, reduce the operation risk, and more flexibly control the peak shaving cost, so as to balance the economic benefit and operation safety. At the same time, the refined cost analysis also provides a more reliable peak shaving cost estimation basis for the power station to participate in the auxiliary peak shaving market competition.

[0092] Embodiment 3 This embodiment is based on Embodiment 1: The embodiment provides a computer device, including a memory and a processor, the memory stores a computer program, and the processor realizes the water turbine unit peak shaving scheme economic comparison method of Embodiment 1 when executing the computer program. The computer program can be in the form of source code, object code, executable file or some intermediate form, etc.

[0093] Embodiment 4 This embodiment is based on Embodiment 1: The embodiment provides a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to realize the water turbine unit peak shaving scheme economic comparison method of Embodiment 1. The computer program can be in the form of source code, object code, executable file or some intermediate form, etc. The storage medium includes any entity or device capable of carrying computer program code, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content of the storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the storage medium does not include electrical carrier signals and telecommunication signals.

[0094] It is apparent that, for the method embodiments described previously, the steps of the methods have been described as being arranged in a particular order. However, it is to be understood that this is merely for the sake of description and the order of the steps of the method embodiments can be altered so long as the methods remain operable. Also, it is to be understood that the method embodiments described above can be implemented by a computer program product, which can be stored on a computer-readable medium.

Claims

1. A method for comparing the economic efficiency of peak-shaving schemes for hydropower units, characterized in that, include: Collect actual peak-shaving schemes, unit operating characteristic data and static parameters of hydropower stations, and determine the basic parameters of individual units after analysis; Establish an optimal load allocation model based on dynamic programming, and solve the zero start-stop peak shaving scheme for fixed unit combinations; evaluate the water consumption, depreciation cost and maintenance cost generated by the start-stop of units in the actual peak shaving scheme; Calculate the total water consumption of the actual peak-shaving scheme and the zero-start-stop peak-shaving scheme, determine the additional water consumption for power generation of the latter relative to the former; evaluate the peak-shaving costs of the actual peak-shaving scheme and the zero-start-stop peak-shaving scheme. Based on the actual peak-shaving scheme's water consumption during the valley and stable phases, and the equivalent power generation water consumption for the economic cost of unit start-up and shutdown, it is determined whether the water consumption can meet the peak-shaving duration requirements of the zero-start-stop peak-shaving scheme during the valley and stable phases.

2. The method for comparing the economic efficiency of peak-shaving schemes for hydropower units according to claim 1, characterized in that, The actual peak-shaving scheme, unit operating characteristic data, and static parameters of the hydropower station are collected and analyzed to determine the basic parameters of a single unit, including: Collect operational data and characteristic data of hydropower units; Determine the service life of the hydropower station's generator units and the investment cost of a single generator unit; The collected power plant operation data is processed into a unified time scale; Discretize the NHQ curve of the hydropower unit's output-head-flow rate and set the output interval and head interval; Discretize the upstream water level-reservoir capacity curve and set the water level discretization interval; Discretize the discharge flow-tailwater level curve and set the water level discretization interval.

3. The method for comparing the economic efficiency of peak-shaving schemes for hydropower units according to claim 2, characterized in that, The hydropower station's operational data includes reservoir water level data, raw output data of each unit, power generation flow data, and comprehensive electricity market price; the hydropower unit's characteristic data includes single-unit installed capacity, unit no-load flow curve, and output-head-flow (NHQ) curve.

4. The method for comparing the economic efficiency of peak-shaving schemes for hydropower units according to claim 1, characterized in that, The establishment of an optimal load allocation model based on dynamic programming, and the solution of zero-start-stop peak-shaving schemes for fixed unit combinations, includes: Under the power-driven water supply model, determine the economic operation optimization objective function of hydropower stations during peak shaving periods, namely, the minimum total power generation water consumption of all hydropower units during peak shaving periods. Define the constraints, including active power balance constraints, unit output limit constraints, water balance constraints, and unit ramping ability constraints. The optimal load allocation model for hydropower station units is solved by taking the unit number as the order, the number of units n as the stage variable, the total output of n units as the state variable, and the load of the nth unit as the decision variable. Based on the dynamic programming optimization principle, a forward recursive equation system is obtained based on the objective function in time period t. The number of operating units in the initial period of the actual peak-shaving scenario is determined, the initial upstream water level and the target output for each period of the peak-shaving process are determined, and these are used as inputs to the model. After calculation, a zero-start-stop peak-shaving scheme is obtained.

5. The method for comparing the economic efficiency of peak-shaving schemes for hydropower units according to claim 1, characterized in that, The assessment of the actual peak-shaving scheme includes the water consumption, depreciation costs, and maintenance costs incurred by the start-up and shutdown of the generating units, including: The total water consumption during the startup process of the computer unit includes the water consumption during the no-load operation phase and the water consumption during the phase when the output increases from zero to a stable output. The total water consumption during the computer group shutdown process includes the water consumption during the no-load operation phase and the water consumption during the process of the output decreasing from shutdown to zero. Based on the collected actual peak-shaving schemes, unit operating characteristic data and static parameters, the service life of the hydropower unit to be studied and the initial investment cost of a single hydropower unit are determined, and then the depreciation cost of a single hydropower unit due to one start-up and shutdown per day is calculated. Based on the cost ratio of a single hydropower unit, the annual maintenance cost is estimated, and the increase in maintenance cost is selected to estimate the increased maintenance cost of a single hydropower unit due to one start-up and shutdown per day.

6. The method for comparing the economic efficiency of peak-shaving schemes for hydropower units according to claim 1, characterized in that, The calculation of the total water consumption of the actual peak-shaving scheme and the zero-start-stop peak-shaving scheme, and the determination of the additional water consumption for power generation of the latter relative to the former, includes: Determine the peak-shaving scenario, extract the actual peak-shaving scheme, use the initial upstream water level of the peak-shaving scenario and the target output of each time period as input to the economic operation model of the hydropower station, create a zero-start-stop peak-shaving scheme, and determine the number of start-stop times of the hydropower units in the actual peak-shaving scheme based on the operating data of the units participating in peak shaving in the actual peak-shaving scheme. Calculate the no-load water consumption of the hydropower units based on the number of start-ups and shutdowns in the actual peak-shaving scheme. The total water consumption for power generation is obtained by summing the power generation flow of all units in each time period of the actual peak-shaving scheme, and then the water consumption generated by the actual peak-shaving scheme is obtained. The total water consumption for power generation is obtained by summing the power generation flow of all units in each time period under the zero start-stop peak shaving scheme, thus obtaining the water consumption generated by the zero start-stop peak shaving scheme. Determine the additional water consumption of the zero-start-stop peak shaving scheme compared to the actual peak shaving scheme.

7. The method for comparing the economic efficiency of peak-shaving schemes for hydropower units according to claim 1, characterized in that, The evaluation of the peak-shaving costs of the actual peak-shaving scheme and the zero-start-stop peak-shaving scheme includes: Based on the number of times hydropower units are started and stopped in the actual peak-shaving scheme, and the increased depreciation and maintenance costs of a single hydropower unit due to one start and stop per day, calculate the depreciation and maintenance costs of the actual peak-shaving scheme caused by the start and stop of hydropower units. Based on the additional water consumption generated by the zero-start-stop peak shaving scheme compared to the actual peak shaving scheme, this additional water consumption is regarded as the lost power generation potential under the initial head and optimal unit output conditions during the peak shaving period, and the power loss is calculated; combined with the electricity market price, the peak shaving cost of the zero-start-stop peak shaving scheme is calculated. Compare the peak-shaving costs of the actual peak-shaving scheme and the zero-start-stop peak-shaving scheme, and select the scheme with the highest economic benefits.

8. The method for comparing the economic efficiency of peak-shaving schemes for hydropower units according to claim 1, characterized in that, The determination of whether the water consumption based on the actual peak-shaving scheme during the valley and stable phase, and the equivalent power generation water consumption at the economic cost of unit start-up and shutdown, can meet the peak-shaving duration requirements of the zero-start-stop peak-shaving scheme during the valley and stable phase includes: Determine the total water consumption during the stable output phase of the actual peak-shaving scheme; the stable output phase includes: during the peak-shaving trough phase, the total power output of the power plant fluctuates slightly within a preset range and maintains thermal stability; Determine the power generation water consumption corresponding to the economic cost of unit start-up and shutdown in the actual peak-shaving scheme, and the average output and average total power generation flow of all units during the peak-shaving low-valley stable phase of the actual peak-shaving scheme; under the initial head and average output and average power generation flow conditions of the actual peak-shaving period, determine the power generation water consumption corresponding to the additional economic cost of unit start-up and shutdown. Determine the average power generation flow of all units during the peak-shaving, low-valley, and stable phases of the zero-start-stop peak-shaving scheme. Based on the water consumption corresponding to the peak-shaving low-valley stable phase in the actual peak-shaving scheme and the water consumption equivalent to the economic cost of unit start-up and shutdown for power generation, calculate the running time and total duration of the peak-shaving low-valley stable phase of the zero-start-stop peak-shaving scheme. If the running time is greater than or equal to the total duration, then the peak-shaving low-valley phase of the actual peak-shaving scheme can be replaced by the zero-start-stop peak-shaving scheme; otherwise, it cannot be replaced.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the method for comparing the economic efficiency of peak-shaving schemes for hydropower units as described in any one of claims 1-8.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for comparing the economic efficiency of peak-shaving schemes for hydropower units as described in any one of claims 1-8.

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