Method for optimizing arrangement of water delivery system of pumped storage power station

Abstract

The invention discloses a pumped storage power station water delivery system arrangement optimization method, which is characterized by comprising the following steps of A, drawing up water delivery system arrangement data; b, setting control parameters of the water delivery system; c, performing large fluctuation transition process calculation according to the control parameters; d, setting a control group according to the initial values of the control parameters; and E, respectively calculating according to the initial value and each control group. According to the method, under the condition that calculation steps are simplified, the multiple sets of arrangement schemes are solved, so that the optimal solution is obtained, and the arrangement schemes are more excellent and more reasonable.

Description

Technical Field

[0001] The invention relates to a method for optimizing the layout of a water delivery system of a pumped storage power station, and belongs to the technical field of pumped storage power stations. Background Art

[0002] At present, there are still many key and difficult problems in the construction of pumped storage power stations, and the transition process analysis during the construction period of the power station is one of them. Compared with conventional units, reversible units have more operating conditions and complex operating condition conversions, so the hydraulic transition process of pumped storage power stations is relatively complex. For pumped storage power stations with long water supply systems, changes in parameters such as the diameter of the water supply system, roughness, and local head loss will have a certain impact on the calculation results of the transition process of the power station.

[0003] The characteristic curve of the pumped storage unit reflects the changing relationship between the speed, flow rate and output during the transition process, and is an important basis for analyzing the transition process of the power station. The full characteristics of the medium and high head pump turbine have an obvious reverse "S" type unstable area, which will have a great impact on the control parameters such as pressure and speed of the water transmission and power generation system. On the one hand, the water transmission system needs to be adjusted and calculated, which is affected by the characteristics of the unit; on the other hand, the stable operation of the unit is affected by the layout of the water transmission system. Therefore, it is necessary to consider the influence of the unit characteristics when arranging the water transmission system, so as to obtain the optimal layout plan of the water transmission system.

[0004] The layout of the water supply system of the pumped storage power station consists of the upper reservoir inlet / outlet, power plant, lower reservoir inlet / outlet, and surge chamber. The hydraulic transition process analysis includes large fluctuation transition process, small fluctuation transition process, and hydraulic interference transition process. Control indicators of large fluctuation transition process: maximum pressure at the end of the volute, minimum pressure at the inlet of the tailwater pipe, surge extreme value of the surge chamber, maximum rate of increase of the unit speed, and minimum pressure at the top of the water supply pipeline; control indicators of small fluctuation transition process: under the same set of governor parameters, when the same hydraulic unit unit has a 5% to 10% load jump at the same time, the adjustment time, number of oscillations, maximum deviation, overshoot, and attenuation required for the speed to enter the ±0.2% bandwidth; control indicators of hydraulic interference transition process: unit power swing amplitude. Among them, the large fluctuation transition process is greatly affected by the layout of the water supply system.

[0005] Therefore, we propose a method for optimizing the layout of the water delivery system of a pumped storage power station. Summary of the invention

[0006] The purpose of the present invention is to provide a method for optimizing the layout of a water delivery system of a pumped storage power station. The present invention takes into account the influence of the unit characteristic curve, and pre-screens the pipeline layout only through large fluctuation transition process analysis, thereby simplifying the calculation efficiency.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solution: a method for optimizing the layout of a water delivery system of a pumped storage power station, characterized in that it comprises the following steps:

[0008] A. Propose the layout data of the water delivery system, including the height difference H1 between the center line of the upper reservoir water inlet and the center line of the power plant water inlet, the horizontal distance L1 between the upper reservoir water inlet and the power plant water inlet, the height difference H2 between the center line of the lower reservoir water outlet and the center line of the power plant water outlet, and the height difference L2 between the lower reservoir water outlet and the power plant water outlet;

[0009] B. Formulate various control parameters of the water delivery system, including diversion tunnel control parameters, tailrace tunnel control parameters, diversion surge chamber control parameters, tailrace surge chamber control parameters and pump-turbine characteristic curves;

[0010] C. Calculate the large fluctuation transition process according to the control parameters, and judge whether the calculation results meet the large fluctuation transition process control index. If the requirements are not met, adjust the control parameters according to the analysis results until the large fluctuation process analysis control index is met, and take the control parameters at this time as the initial value;

[0011] D. Set up a control group based on the initial values ​​of the control parameters, and analyze the large fluctuation transition process of the initial values ​​and the control group. If the requirements are met, retain the results. If not, no adjustment will be made and the results will be discarded.

[0012] E. Calculate the initial value and the head loss and the minimum pressure of the tailwater pipe inlet of each control group respectively, and take the one with the smallest minimum pressure and head loss of the tailwater pipe inlet as the final control parameter of the water diversion tunnel.

[0013] In the above-mentioned method for optimizing the layout of the water delivery system of a pumped storage power station, in step B: the control parameters of the water diversion tunnel include the diameter D1 of the water diversion tunnel and the roughness n1 of the water diversion tunnel;

[0014] The tailwater tunnel control parameters include the tailwater tunnel diameter D2 and the tailwater tunnel roughness n2;

[0015] The control parameters of the water diversion surge chamber include the impedance hole diameter d1. When the water diversion surge chamber is not required, d1 = 0;

[0016] The tailwater surge chamber control parameters include the impedance hole diameter d2, when the tailwater surge chamber is not required, d2 = 0;

[0017] The pump-turbine characteristic curve is a four-quadrant characteristic curve of unit flow and unit torque. Initially, the unit characteristic curve of an existing project of the same scale can be selected.

[0018] In the above-mentioned method for optimizing the layout of the water delivery system of a pumped storage power station, the diameter of the diversion tunnel D1 and the diameter of the tailwater tunnel D2 can be estimated as the initial value according to the following formula:

[0019]

[0020] Among them, Qmax is the maximum withdrawal flow of the waterway and v is the economic flow rate.

[0021] In the above-mentioned method for optimizing the layout of the water delivery system of a pumped storage power station, the roughness n1 of the diversion tunnel and the roughness n2 of the tailwater tunnel are determined as follows:

[0022] If a steel-lined diversion tunnel is used, the tunnel roughness n = 0.012;

[0023] If concrete lining is used for the diversion tunnel, the tunnel roughness n = 0.019-0.022.

[0024] In the aforementioned method for optimizing the layout of the water supply system of a pumped storage power station, the large fluctuation transition process control indicators described in step C include: the maximum pressure at the end of the volute in the water supply system, the minimum pressure at the inlet of the tailwater pipe, the surge extreme value of the surge chamber, the maximum increase rate of the unit speed ≤45%, and the minimum pressure at the top of the water supply pipeline ≥2m.

[0025] In the above-mentioned method for optimizing the layout of the water delivery system of a pumped storage power station, the method for adjusting the control parameters in step C is as follows: S1, when the surge extreme value of the surge chamber is not satisfied, adjusting the surge chamber parameters;

[0026] S2. When the minimum pressure at the top of the water pipeline is not met, adjust the length of the flat section and the bottom elevation;

[0027] S3. When the maximum pressure at the end of the volute and the maximum rate of increase of the unit speed do not meet the requirements, the pump turbine parameters can be adjusted.

[0028] In the aforementioned method for optimizing the layout of the water supply system of a pumped-storage power station, the method for setting up a control group in step D is: the values ​​of the initial values ​​of the tunnel diameter ±0.5m, ±1.0m, ±1.5m, and ±2.0m in the initial values ​​of the control parameters are respectively used as the control group.

[0029] In the aforementioned method for optimizing the layout of the water delivery system of a pumped storage power station, in step E, the head loss may be 2%-5% of the design head.

[0030] Compared with the prior art, the present invention takes into account the influence of the unit characteristic curve during the initial design of the water pipeline, and pre-screens the pipeline layout only through large fluctuation transition process analysis, which simplifies the calculation efficiency and saves the work difficulty of the staff; the present invention can solve multiple groups of layout schemes under the condition of simplified calculation steps, thereby obtaining the optimal solution, and the layout scheme is better and more reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1is a schematic diagram of the water delivery system of the present invention;

[0032] Figure 2 It is a flow chart of the method of the present invention.

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0034] Embodiment 1 of the present invention: A method for optimizing the layout of a water delivery system of a pumped storage power station, characterized in that it comprises the following steps:

[0035] A. Propose the layout data of the water delivery system, including the height difference H1 between the center line of the upper reservoir inlet and the center line of the power plant inlet, the horizontal distance L1 between the upper reservoir inlet and the power plant inlet, the height difference H2 between the center line of the lower reservoir outlet and the center line of the power plant outlet, and the height difference L2 between the lower reservoir outlet and the power plant outlet.

[0036] B. Formulate the control parameters of the water delivery system, including the diversion tunnel control parameters, tailwater tunnel control parameters, diversion surge chamber control parameters, tailwater surge chamber control parameters and pump-turbine characteristic curves.

[0037] C. Calculate the large fluctuation transition process according to the control parameters, and judge whether the calculation results meet the large fluctuation transition process control index. If the requirements are not met, adjust the control parameters according to the analysis results until the large fluctuation process analysis control index is met, and take the control parameters at this time as the initial value;

[0038] D. Set up a control group based on the initial values ​​of the control parameters, and analyze the large fluctuation transition process of the initial values ​​and the control group. If the requirements are met, retain the results. If not, no adjustment will be made and the results will be discarded.

[0039] E. Calculate the initial value and the head loss and the minimum pressure of the tailwater pipe inlet of each control group respectively, and take the one with the smallest minimum pressure and head loss of the tailwater pipe inlet as the final control parameter of the water diversion tunnel.

[0040] Embodiment 2 of the present invention: A method for optimizing the layout of a water delivery system of a pumped storage power station, characterized in that it comprises the following steps:

[0041] A. Propose the layout data of the water delivery system, including the height difference H1 between the center line of the upper reservoir water inlet and the center line of the power plant water inlet, the horizontal distance L1 between the upper reservoir water inlet and the power plant water inlet, the height difference H2 between the center line of the lower reservoir water outlet and the center line of the power plant water outlet, and the height difference L2 between the lower reservoir water outlet and the power plant water outlet;

[0042] B. Formulate various control parameters of the water delivery system, including diversion tunnel control parameters, tailwater tunnel control parameters, diversion surge chamber control parameters, tailwater surge chamber control parameters and pump-turbine characteristic curve; among them, diversion tunnel control parameters include diversion tunnel diameter D1 and diversion tunnel roughness n1; tailwater tunnel control parameters include tailwater tunnel diameter D2 and tailwater tunnel roughness n2; diversion surge chamber control parameters include impedance hole diameter d1, when diversion surge chamber is not required, d1=0; tailwater surge chamber control parameters include impedance hole diameter d2, when tailwater surge chamber is not required, d2=0; pump-turbine characteristic curve is a four-quadrant characteristic curve of unit flow and unit torque, and the unit characteristic curve of an existing project of the same scale can be selected initially.

[0043] C. Calculate the large fluctuation transition process according to the control parameters, and judge whether the calculation results meet the large fluctuation transition process control index. If the requirements are not met, adjust the control parameters according to the analysis results until the large fluctuation process analysis control index is met, and take the control parameters at this time as the initial value;

[0044] D. Set up a control group based on the initial values ​​of the control parameters, and analyze the large fluctuation transition process of the initial values ​​and the control group. If the requirements are met, retain the results. If not, no adjustment will be made and the results will be discarded.

[0045] E. Calculate the initial value and the head loss and the minimum pressure of the tailwater pipe inlet of each control group respectively, and take the one with the smallest minimum pressure and head loss of the tailwater pipe inlet as the final control parameter of the water diversion tunnel.

[0046] Embodiment 3 of the present invention: A method for optimizing the layout of a water delivery system of a pumped storage power station, characterized in that it comprises the following steps:

[0047] A. Propose the layout data of the water delivery system, including the height difference H1 between the center line of the upper reservoir water inlet and the center line of the power plant water inlet, the horizontal distance L1 between the upper reservoir water inlet and the power plant water inlet, the height difference H2 between the center line of the lower reservoir water outlet and the center line of the power plant water outlet, and the height difference L2 between the lower reservoir water outlet and the power plant water outlet;

[0048] B. Formulate various control parameters of the water delivery system, including diversion tunnel control parameters, tailwater tunnel control parameters, diversion surge chamber control parameters, tailwater surge chamber control parameters and pump-turbine characteristic curve; among them, diversion tunnel control parameters include diversion tunnel diameter D1 and diversion tunnel roughness n1; tailwater tunnel control parameters include tailwater tunnel diameter D2 and tailwater tunnel roughness n2; diversion surge chamber control parameters include impedance hole diameter d1, when diversion surge chamber is not required, d1=0; tailwater surge chamber control parameters include impedance hole diameter d2, when tailwater surge chamber is not required, d2=0; pump-turbine characteristic curve is a four-quadrant characteristic curve of unit flow and unit torque, and the unit characteristic curve of an existing project of the same scale can be selected initially.

[0049] The above-mentioned diversion tunnel diameter D1 and tailwater tunnel diameter D2 can be estimated as the initial value according to the following formula:

[0050]

[0051] Among them, Qmax is the maximum withdrawal flow of the waterway and v is the economic flow rate.

[0052] The values ​​of the above-mentioned diversion tunnel roughness n1 and tailwater tunnel roughness n2 are as follows: if a steel-lined diversion tunnel is used, the tunnel roughness n=0.012; if a concrete-lined diversion tunnel is used, the tunnel roughness n=0.019-0.022.

[0053] C. Calculate the large fluctuation transition process according to the control parameters, and judge whether the calculation results meet the large fluctuation transition process control index. If the requirements are not met, adjust the control parameters according to the analysis results until the large fluctuation process analysis control index is met, and take the control parameters at this time as the initial value;

[0054] D. Set up a control group based on the initial values ​​of the control parameters, and analyze the large fluctuation transition process of the initial values ​​and the control group. If the requirements are met, retain the results. If not, no adjustment will be made and the results will be discarded.

[0055] E. Calculate the initial value and the head loss and the minimum pressure of the tailwater pipe inlet of each control group respectively, and take the one with the smallest minimum pressure and head loss of the tailwater pipe inlet as the final control parameter of the water diversion tunnel.

[0056] Embodiment 4 of the present invention: A method for optimizing the layout of a water delivery system of a pumped storage power station, characterized in that it comprises the following steps:

[0057] A. Propose the layout data of the water delivery system, including the height difference H1 between the center line of the upper reservoir inlet and the center line of the power plant inlet, the horizontal distance L1 between the upper reservoir inlet and the power plant inlet, the height difference H2 between the center line of the lower reservoir outlet and the center line of the power plant outlet, and the height difference L2 between the lower reservoir outlet and the power plant outlet.

[0058] B. Formulate various control parameters of the water delivery system, including diversion tunnel control parameters, tailwater tunnel control parameters, diversion surge chamber control parameters, tailwater surge chamber control parameters and pump-turbine characteristic curve; among them, diversion tunnel control parameters include diversion tunnel diameter D1 and diversion tunnel roughness n1; tailwater tunnel control parameters include tailwater tunnel diameter D2 and tailwater tunnel roughness n2; diversion surge chamber control parameters include impedance hole diameter d1, when diversion surge chamber is not required, d1=0; tailwater surge chamber control parameters include impedance hole diameter d2, when tailwater surge chamber is not required, d2=0; pump-turbine characteristic curve is a four-quadrant characteristic curve of unit flow and unit torque, and the unit characteristic curve of an existing project of the same scale can be selected initially.

[0059] The above-mentioned diversion tunnel diameter D1 and tailwater tunnel diameter D2 can be estimated as the initial value according to the following formula:

[0060]

[0061] Among them, Qmax is the maximum withdrawal flow of the waterway and v is the economic flow rate.

[0062] The values ​​of the above-mentioned diversion tunnel roughness n1 and tailwater tunnel roughness n2 are as follows: if a steel-lined diversion tunnel is used, the tunnel roughness n=0.012; if a concrete-lined diversion tunnel is used, the tunnel roughness n=0.019-0.022.

[0063] C. Calculate the large fluctuation transition process according to the control parameters, and judge whether the calculation results meet the large fluctuation transition process control index. If the requirements are not met, adjust the control parameters according to the analysis results until the large fluctuation process analysis control index is met, and take the control parameters at this time as the initial value;

[0064] Among them, the control indicators of large fluctuation transition process include: the maximum pressure at the end of the volute in the water supply system, the minimum pressure at the inlet of the tailwater pipe, the surge extreme value of the surge chamber, the maximum increase rate of the unit speed ≤45%, and the minimum pressure at the top of the water supply pipeline ≥2m.

[0065] The method for adjusting the control parameters is as follows: when the surge extreme value of the surge chamber is not met, adjust the surge chamber parameters; when the minimum pressure at the top of the water pipeline is not met, adjust the flat section length and bottom elevation; when the maximum pressure at the end of the volute and the maximum rise rate of the unit speed do not meet the requirements, adjust the pump turbine parameters.

[0066] D. Set up a control group based on the initial values ​​of the control parameters, and analyze the large fluctuation transition process of the initial values ​​and the control group. If the requirements are met, retain the results. If not, no adjustment will be made and the results will be discarded.

[0067] E. Calculate the initial value and the head loss and the minimum pressure of the tailwater pipe inlet of each control group respectively, and take the one with the smallest minimum pressure and head loss of the tailwater pipe inlet as the final control parameter of the water diversion tunnel.

[0068] Embodiment 5 of the present invention: A method for optimizing the layout of a water delivery system of a pumped storage power station, characterized in that it comprises the following steps:

[0069] A. Propose the layout data of the water delivery system, including the height difference H1 between the center line of the upper reservoir inlet and the center line of the power plant inlet, the horizontal distance L1 between the upper reservoir inlet and the power plant inlet, the height difference H2 between the center line of the lower reservoir outlet and the center line of the power plant outlet, and the height difference L2 between the lower reservoir outlet and the power plant outlet.

[0070] B. Formulate various control parameters of the water delivery system, including diversion tunnel control parameters, tailwater tunnel control parameters, diversion surge chamber control parameters, tailwater surge chamber control parameters and pump-turbine characteristic curve; among them, diversion tunnel control parameters include diversion tunnel diameter D1 and diversion tunnel roughness n1; tailwater tunnel control parameters include tailwater tunnel diameter D2 and tailwater tunnel roughness n2; diversion surge chamber control parameters include impedance hole diameter d1, when diversion surge chamber is not required, d1=0; tailwater surge chamber control parameters include impedance hole diameter d2, when tailwater surge chamber is not required, d2=0; pump-turbine characteristic curve is a four-quadrant characteristic curve of unit flow and unit torque, and the unit characteristic curve of an existing project of the same scale can be selected initially.

[0071] The above-mentioned diversion tunnel diameter D1 and tailwater tunnel diameter D2 can be estimated as the initial value according to the following formula:

[0072]

[0073] Among them, Qmax is the maximum withdrawal flow of the waterway and v is the economic flow rate.

[0074] The values ​​of the above-mentioned diversion tunnel roughness n1 and tailwater tunnel roughness n2 are as follows: if a steel-lined diversion tunnel is used, the tunnel roughness n=0.012; if a concrete-lined diversion tunnel is used, the tunnel roughness n=0.019-0.022.

[0075] When arranging the water diversion tunnel, if a typical three-level flat section and two-level inclined shaft is used, the inclined shaft angle can be initially taken as α=60°. If a reinforced concrete lining is used, the buried depth of the water transmission line must still meet the "three major criteria".

[0076] D. Calculate the large fluctuation transition process according to the control parameters, and determine whether the calculation results meet the large fluctuation transition process control indicators. If they do not meet the requirements, adjust the control parameters according to the analysis results until the large fluctuation process analysis control indicators are met, and take the control parameters at this time as the initial values;

[0077] Among them, the control indicators of large fluctuation transition process include: the maximum pressure at the end of the volute in the water supply system, the minimum pressure at the inlet of the tailwater pipe, the surge extreme value of the surge chamber, the maximum increase rate of the unit speed ≤45%, and the minimum pressure at the top of the water supply pipeline ≥2m.

[0078] The method for adjusting the control parameters is as follows: when the surge extreme value of the surge chamber is not met, adjust the surge chamber parameters; when the minimum pressure at the top of the water pipeline is not met, adjust the flat section length and bottom elevation; when the maximum pressure at the end of the volute and the maximum rise rate of the unit speed do not meet the requirements, adjust the pump turbine parameters.

[0079] D. A control group is established based on the initial values ​​of the control parameters, and a large fluctuation transition process analysis is performed on the initial values ​​and the control group. If the requirements are met, the results are retained. If not, the results are discarded without further adjustment. When establishing a control group: the initial values ​​of the tunnel diameter in the initial values ​​of the control parameters of ±0.5m, ±1.0m, ±1.5m, and ±2.0m are used as the control group respectively.

[0080] E. Calculate the initial value and the head loss of each control group and the minimum pressure at the tailwater inlet respectively. The one with the smallest minimum pressure at the tailwater inlet and the smallest head loss shall be used as the final control parameter of the water diversion tunnel. In order to ensure economy, the head loss can be controlled to be between 2% and 5% of the design head.

[0081] Working principle of an embodiment of the present invention: The present invention first determines the location and elevation of the upper reservoir inlet / outlet, underground powerhouse, and lower reservoir inlet / outlet according to the geological conditions of the project, that is, Figure 1 H1, L1, H2, L2 in the drawing; Principles of diversion tunnel layout: When the diversion tunnel adopts a typical three-level horizontal section and two-level inclined shaft, the inclined shaft angle can be initially taken as α=60°. When reinforced concrete lining is used, the buried depth of the water transmission line must still meet the "three major criteria". The diameters of the diversion tunnel D1 and the tailwater tunnel D2 can be estimated as the initial values ​​according to the above calculation formula.

[0082] Large fluctuation transition process control indicators: maximum pressure at the end of the volute, minimum pressure at the tailwater pipe inlet, surge extreme value of the surge chamber, maximum rate of increase of the unit speed ≤45%, and minimum pressure at the top of the water pipeline ≥2m. When the initial value of the large fluctuation transition process analysis control indicators does not meet the requirements, adjust the initial value according to the results: if the surge extreme value of the surge chamber is not met, the surge chamber parameters can be adjusted; when the minimum pressure at the top of the water pipeline is not met, the flat section length and bottom elevation can be adjusted; if the maximum pressure at the end of the volute and the maximum rate of increase of the unit speed do not meet the requirements, the pump turbine parameters can be adjusted if necessary. Until the large fluctuation process analysis control indicators are met, take the tunnel control parameters, surge chamber control parameters, and pump turbine characteristic curves at this time as the initial values.

[0083] The initial values ​​of tunnel diameter ±0.5m, ±1.0m, ±1.5m, and ±2.0m are used as the control group, and the large fluctuation transition process analysis is carried out again. When the requirements are met, the results are retained and the next level is calculated. When they are not met, the results are discarded without adjustment.

[0084] The head loss and the minimum pressure at the tailwater pipe inlet are calculated under the initial value and each level of tunnel diameter. The optimal solution for the control parameters of the water conveyance tunnel is the one with the minimum pressure at the tailwater pipe inlet and the minimum head loss. In order to ensure economy, the head loss can be controlled to be between 2% and 5% of the design head. The final layout plan of the pumped storage power station water conveyance system is obtained.

Claims

1. A method for optimizing the layout of a water delivery system of a pumped storage power station, characterized in that: The following steps are involved: A. Propose the layout data of the water delivery system, including the height difference H1 between the center line of the upper reservoir water inlet and the center line of the power plant water inlet, the horizontal distance L1 between the upper reservoir water inlet and the power plant water inlet, the height difference H2 between the center line of the lower reservoir water outlet and the center line of the power plant water outlet, and the height difference L2 between the lower reservoir water outlet and the power plant water outlet; B. Formulate various control parameters of the water delivery system, including diversion tunnel control parameters, tailrace tunnel control parameters, diversion surge chamber control parameters, tailrace surge chamber control parameters and pump-turbine characteristic curves; C. Calculate the large fluctuation transition process according to the control parameters, and judge whether the calculation results meet the large fluctuation transition process control index. If the requirements are not met, adjust the control parameters according to the analysis results until the large fluctuation process analysis control index is met, and take the control parameters at this time as the initial value; D. Set up a control group based on the initial values ​​of the control parameters, and analyze the large fluctuation transition process of the initial values ​​and the control group. If the requirements are met, retain the results. If not, no adjustment will be made and the results will be discarded. E. Calculate the initial value and the head loss and the minimum pressure of the tailwater pipe inlet of each control group respectively, and take the one with the smallest minimum pressure and head loss of the tailwater pipe inlet as the final control parameter of the water diversion tunnel.

2. A method for optimizing the layout of a pumped storage power station water delivery system according to claim 1, characterized in that: In the step B: the control parameters of the water diversion tunnel include the water diversion tunnel diameter D1 and the water diversion tunnel roughness n1; The tailwater tunnel control parameters include the tailwater tunnel diameter D2 and the tailwater tunnel roughness n2; The control parameters of the water diversion surge chamber include the impedance hole diameter d1. When the water diversion surge chamber is not required, d1 = 0; The tailwater surge chamber control parameters include the impedance hole diameter d2, when the tailwater surge chamber is not required, d2 = 0; The pump-turbine characteristic curve is a four-quadrant characteristic curve of unit flow and unit torque. Initially, the unit characteristic curve of an existing project of the same scale can be selected.

3. A method for optimizing the layout of a pumped storage power station water delivery system according to claim 2, characterized in that: The diversion tunnel diameter D1 and the tailwater tunnel diameter D2 can be estimated as the initial value according to the following formula: Among them, Qmax is the maximum withdrawal flow of the waterway and v is the economic flow rate.

4. A method for optimizing the layout of a water delivery system of a pumped storage power station according to claim 3, characterized in that: The values ​​of the roughness n1 of the diversion tunnel and the roughness n2 of the tailwater tunnel are as follows: If a steel-lined diversion tunnel is used, the tunnel roughness n = 0.012; If concrete lining is used for the diversion tunnel, the tunnel roughness n = 0.019-0.

022.

5. A method for optimizing the layout of a pumped storage power station water delivery system according to claim 4, characterized in that: The large fluctuation transition process control indicators described in step C include: the maximum pressure at the end of the volute in the water supply system, the minimum pressure at the tailwater pipe inlet, the surge extreme value of the surge chamber, the maximum increase rate of the unit speed ≤45%, and the minimum pressure at the top of the water supply pipeline ≥2m.

6. A method for optimizing the layout of a pumped storage power station water delivery system according to claim 5, characterized in that: The method for adjusting the control parameters described in step C is: S1. When the surge extreme value of the surge chamber is not met, adjust the surge chamber parameters; S2. When the minimum pressure at the top of the water pipeline is not met, adjust the length of the flat section and the bottom elevation; S3. When the maximum pressure at the end of the volute and the maximum rate of increase of the unit speed do not meet the requirements, the pump turbine parameters can be adjusted.

7. A method for optimizing the layout of a pumped storage power station water delivery system according to claim 6, characterized in that: The method for setting up a control group in step D is: the values ​​of the initial values ​​of the tunnel diameter ±0.5m, ±1.0m, ±1.5m, and ±2.0m in the initial values ​​of the control parameters are respectively used as the control group.

8. A method for optimizing the layout of a water delivery system of a pumped storage power station according to claim 7, characterized in that: In step E, the head loss may be 2%-5% of the design head.

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