Method and device for predicting reservoir water level process during combined operation of pumped storage and conventional hydropower, medium and product

Abstract

The invention discloses a method and device for predicting the reservoir water level process during pumped storage and conventional hydropower combined operation, a medium and a product, and relates to the field of pumped storage and hydropower combined operation. Based on the operation parameters, determining energy conversion characteristics of the pumped storage power station, and constructing an objective function and constraint conditions; under different power generation and pumping modes of the pumped storage power station, solving the target function by taking a constraint condition as a constraint to obtain the storage capacity of each lower storage at each moment in a scheduling period under different power generation and pumping modes; determining the water level process of each lower reservoir in the scheduling period under the different power generation and water pumping modes based on the reservoir capacity of each lower reservoir at each moment in the scheduling period under the different power generation and water pumping modes; the water level process comprises water levels at all moments. According to the method, prediction of the reservoir water level change process of the pumped storage power station in different pumping modes is realized.

Description

Technical Field

[0001] The present application relates to the field of combined operation of pumped storage and hydropower, and in particular to a method, device, medium and product for predicting reservoir water level process during combined operation of pumped storage and conventional hydropower. Background Art

[0003] Pumped-storage power stations are green, low-carbon, clean, and flexible power sources with mature technology, superior economic efficiency, and conditions for large-scale development. Their peak-shaving capacity is roughly twice the installed capacity. Compared with pure pumped-storage power stations, hybrid pumped-storage power stations (referred to as hybrid storage power stations) are built in combination with the upper and lower reservoirs of existing hydropower stations. They have relatively abundant site resources and have the advantages of short construction period, small project investment, and can reduce or avoid land flooding. If the upper and lower reservoirs have good regulation performance, they can respond to seasonal fluctuations in wind and light energy sources and become ideal "long-term energy storage" power sources for power systems. At this stage, research on pumped storage mainly focuses on site planning, optimal scheduling, and new energy consumption. Existing research focuses more on the benefits that pumped storage can bring, and less on its impact.

[0004] Therefore, a determination method is needed for analyzing the change process of the lower reservoir water level under the combined operation of pumped storage and conventional hydropower. Summary of the invention

[0005] The purpose of this application is to provide a method, device, medium and product for predicting the water level process of the lower reservoir when pumped storage and conventional hydropower are operated jointly, so as to solve the problem that the existing technology cannot realize the prediction of the water level change process of the lower reservoir when pumped storage and conventional hydropower are operated jointly.

[0006] To achieve the above objectives, this application provides the following solutions:

[0007] In the first aspect, the present application provides a method for predicting the reservoir water level process when pumped storage and conventional hydropower are jointly operated, including:

[0008] Obtaining operating parameters; the operating parameters include: the required total load at each moment in the dispatching cycle issued by the power grid and the equipment information of each hydropower plant; the equipment information includes: the number of reservoirs, the performance parameters of each pumped-storage power station, the limiting parameters of each reservoir and the inflow flow of the reservoir at each moment; the reservoir includes: an upper reservoir and a lower reservoir, and one reservoir corresponds to at least one of a pumped-storage power station and conventional hydropower; the performance parameters include: power generation efficiency, pumping status, minimum pumping output, maximum pumping output, minimum power generation output, maximum power generation output, minimum value of power generation flow, maximum value of power generation flow, minimum value of pumping flow and maximum value of pumping flow; the limiting parameters include: upper limit of storage capacity, lower limit of storage capacity, minimum output, maximum output, minimum downstream flow and maximum downstream flow;

[0009] Based on the operating parameters, the energy conversion characteristics of the pumped storage power station are determined, and an objective function and constraint conditions are constructed; the objective function takes the minimum total water consumption for power generation in the reservoir as the goal; the constraint conditions include: water balance and reservoir capacity constraint, output constraint, pumped storage balance constraint and downstream flow constraint;

[0010] Under different power generation and pumping modes of the pumped storage power station, the objective function is solved with the constraint condition as a constraint to obtain the storage capacity of each lower reservoir at each moment in the dispatching cycle under different power generation and pumping modes;

[0011] Based on the storage capacity of each lower reservoir at each moment in the dispatching cycle under different power generation and pumping modes, the water level process of each lower reservoir within the dispatching cycle under different power generation and pumping modes is determined; the water level process includes: the water level at each moment.

[0012] Optionally, the energy conversion characteristics include:

[0013]

[0014] in, is the power generation of the pumped storage power station at time t; is the average generating head of the pumped storage power station at time t; is the water consumption of the pumped storage power station at time t; The power generation efficiency of pumped storage power stations; is the pumping power consumption of the pumped storage power station at time t; is the average pumping head of the pumped storage power station at time t; is the pumped storage flow of the pumped storage power station at time t; It is the operating efficiency of the pumped storage power station under pumping state.

[0015] Optionally, the objective function includes:

[0016]

[0017] Among them, W out is the target value of total water consumption for power generation in the reservoir; T is the dispatching period; N is the number of reservoirs; is the outflow of the ith reservoir at time t; Δt is the time granularity.

[0018] Optionally, the water balance and storage capacity constraints include:

[0019]

[0020]

[0021] in, is the storage capacity of the upper storage at time t+1; is the storage capacity of the upper storage at time t; is the storage capacity of the lower storage at time t+1; is the storage capacity of the lower storage at time t; is the inflow flow of the lower storage at time t; is the outbound flow of the next warehouse at time t; is the storage capacity of the i-th reservoir at time t+1; is the storage capacity of the i-th reservoir at time t; is the inflow of the i-th reservoir at time t; V i max is the upper limit of the storage capacity of the i-th reservoir; V i min is the lower limit of the storage capacity of the ith reservoir.

[0022] Optionally, the output constraint includes:

[0023]

[0024] in, is the total output of each reservoir at time t; L t is the total load required at time t; P i t is the output of the i-th reservoir at time t; P i min is the minimum output of the i-th reservoir; P i max is the maximum output of the i-th reservoir; It is the minimum pumping output of the pumped storage power station; It is the maximum pumping output of the pumped storage power station; It is the minimum power output of the pumped storage power station; It is the maximum power generation output of a pumped storage power station.

[0025] Optionally, the pumped storage balancing constraint includes:

[0026]

[0027] in, The pumping time for pumped storage power stations; It is the pumping flow of the pumped storage power station; The power generation time of the pumped storage power station; It is the power generation flow of the pumped storage power station.

[0028] Optionally, the downstream flow restriction includes:

[0029]

[0030] in, is the minimum value of the power generation flow of the pumped storage power station; is the maximum value of the power generation flow of the pumped storage power station; is the minimum pumping flow rate of the pumped storage power station; and is the maximum value of the pumped flow rate of the pumped storage power station; is the minimum discharge flow of the ith reservoir; is the discharge of the ith reservoir at time t; is the maximum discharge flow of the ith reservoir.

[0031] In a second aspect, the present application provides a computer device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for predicting the reservoir water level process when pumped storage and conventional hydropower are operated in conjunction as described in any one of the above items.

[0032] In a third aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for predicting a reservoir water level process when pumped storage and conventional hydropower are operated in conjunction with each other as described in any one of the above items.

[0033] In a fourth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the method for predicting the reservoir water level process when pumped storage and conventional hydropower are operated jointly as described in any of the above items.

[0034] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0035] The present application discloses a method, device, medium and product for predicting the water level process of the lower reservoir when pumped storage and conventional hydropower are jointly operated. First, the operating parameters are obtained; secondly, based on the operating parameters, the energy conversion characteristics of the pumped storage power station are determined, and the objective function and constraint conditions are constructed; the objective function takes the minimum total water consumption for power generation in the reservoir as the goal; the constraint conditions include: water balance and reservoir capacity constraints, output constraints, pumped storage balance constraints and downstream flow constraints; then, under different power generation and pumping modes of the pumped storage power station, the objective function is solved with the constraint conditions as constraints to obtain the reservoir capacity of each lower reservoir at each moment in the dispatching cycle under different power generation and pumping modes; finally, based on the reservoir capacity of each lower reservoir at each moment in the dispatching cycle under different power generation and pumping modes, the water level process of each lower reservoir in the dispatching cycle under different power generation and pumping modes is determined; the water level process includes: the water level at each moment. The present application predicts the impact of the joint operation of pumped storage and conventional hydropower on the water level of the lower reservoir, and improves the ability of the pumped storage unit to respond to grid demand in different time periods. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic flow chart of a method for predicting the reservoir water level process during the combined operation of pumped storage and conventional hydropower provided in one embodiment of the present application;

[0038] Figure 2 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] The purpose of this application is to provide a method, device, medium and product for predicting the water level process of the lower reservoir when pumped storage and conventional hydropower are operated jointly, aiming to realize the prediction of the water level change process of the lower reservoir of a pumped storage power station under different extraction modes.

[0041] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0042] In an exemplary embodiment, Figure 1 As shown, the method for predicting the reservoir water level process when pumped storage and conventional hydropower are jointly operated in this embodiment includes:

[0043] Step 1: Get the running parameters.

[0044] Among them, the operating parameters include: the required total load at each moment in the dispatching cycle issued by the power grid and the equipment information of each hydropower plant; the equipment information includes: the number of reservoirs, the performance parameters of each pumped-storage power station, the limiting parameters of each reservoir and the inflow flow of the reservoir at each moment; the reservoir includes: the upper reservoir and the lower reservoir, and one reservoir corresponds to at least one of the pumped-storage power station and conventional hydropower. The performance parameters include: power generation efficiency, pumping status, minimum pumping output, maximum pumping output, minimum power generation output, maximum power generation output, minimum power generation flow, maximum power generation flow, minimum pumping flow and maximum pumping flow. The limiting parameters include: upper limit of storage capacity, lower limit of storage capacity, minimum output, maximum output, minimum downstream flow and maximum downstream flow.

[0045] Step 2: Based on the operating parameters, determine the energy conversion characteristics of the pumped storage power station and construct the objective function and constraints.

[0046] Among them, the objective function aims to minimize the total water consumption for power generation in the reservoir; the constraints include: water balance and reservoir capacity constraints, output constraints, pumped storage balance constraints and downstream flow constraints.

[0047] As an optional implementation, the energy conversion characteristics include:

[0048]

[0049] in, is the power generation of the pumped storage power station at time t; is the average generating head of the pumped storage power station at time t; is the water consumption of the pumped storage power station at time t; The power generation efficiency of pumped storage power stations; is the pumping power consumption of the pumped storage power station at time t; is the average pumping head of the pumped storage power station at time t; is the pumped storage flow of the pumped storage power station at time t; It is the operating efficiency of the pumped storage power station under pumping state.

[0050] As an optional implementation, the objective function includes:

[0051]

[0052] Among them, W out is the target value of total water consumption for power generation in the reservoir; T is the dispatching period; N is the number of reservoirs; is the outflow of the ith reservoir at time t; Δt is the time granularity.

[0053] As an optional implementation method, water balance and reservoir capacity constraints include:

[0054]

[0055] V i min ≤V i t ≤V i max .

[0056] in, is the storage capacity of the upper storage at time t+1; is the storage capacity of the upper storage at time t; is the storage capacity of the lower storage at time t+1; is the storage capacity of the lower storage at time t; is the inflow flow of the lower storage at time t; is the outbound flow of the next warehouse at time t; V i t+1 is the storage capacity of the i-th reservoir at time t+1; V i t is the storage capacity of the i-th reservoir at time t; is the inflow of the i-th reservoir at time t; V i max is the upper limit of the storage capacity of the i-th reservoir; V i min is the lower limit of the storage capacity of the ith reservoir.

[0057] As an optional implementation mode, the output constraint includes:

[0058]

[0059] P i min ≤P i t ≤P i max .

[0060]

[0061] in, is the total output of each reservoir at time t; L t is the total load required at time t; P it is the output of the i-th reservoir at time t; P i min is the minimum output of the i-th reservoir; P i max is the maximum output of the i-th reservoir; It is the minimum pumping output of the pumped storage power station; It is the maximum pumping output of the pumped storage power station; It is the minimum power output of the pumped storage power station; It is the maximum power generation output of a pumped storage power station.

[0062] As an optional implementation, the pumped storage balance constraint includes:

[0063]

[0064] in, The pumping time for pumped storage power stations; It is the pumping flow of the pumped storage power station; The power generation time of the pumped storage power station; It is the power generation flow of the pumped storage power station.

[0065] As an optional implementation, the downstream flow restriction includes:

[0066]

[0067] in, is the minimum value of the power generation flow of the pumped storage power station; is the maximum value of the power generation flow of the pumped storage power station; is the minimum pumping flow rate of the pumped storage power station; and is the maximum value of the pumped flow rate of the pumped storage power station; is the minimum discharge flow of the ith reservoir; is the discharge of the ith reservoir at time t; is the maximum discharge flow of the ith reservoir.

[0068] Step 3: Under different power generation and pumping modes of the pumped storage power station, the objective function is solved with the constraints as constraints to obtain the storage capacity of each lower reservoir at each moment in the dispatching cycle under different power generation and pumping modes.

[0069] Specifically, the power generation pumping modes include: "one pumping and one generating" or "one pumping and two generating".

[0070] The objective function is solved using Progressive Optimization Algorithm (POA).

[0071] Step 4: Based on the storage capacity of each lower reservoir at each moment in the dispatching cycle under different power generation and pumping modes, determine the water level process of each lower reservoir within the dispatching cycle under different power generation and pumping modes; the water level process includes: the water level at each moment.

[0072] Specifically, the corresponding water level is calculated based on the reservoir capacity using a general volume formula. For example, when the lower reservoir is a rectangular parallelepiped, the corresponding water level can be obtained by dividing the reservoir capacity by the bottom area of ​​the lower reservoir.

[0073] In an exemplary embodiment, a computer device is provided, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement a method for predicting an underwater reservoir water level process when pumped storage and conventional hydropower are operated in combination.

[0074] In an exemplary embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements a method for predicting a reservoir water level process when pumped storage and conventional hydropower are operated in combination.

[0075] In an exemplary embodiment, a computer program product is provided, including a computer program, which, when executed by a processor, implements a method for predicting a reservoir water level process when pumped storage and conventional hydropower are operated in combination.

[0076] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 2 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for predicting the reservoir water level process when pumped storage and conventional hydropower are jointly operated is implemented.

[0077] Those skilled in the art will understand that Figure 2The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0078] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0079] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0080] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0081] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for predicting the reservoir water level process when pumped storage and conventional hydropower are jointly operated, characterized in that: The method for predicting the reservoir water level process during the combined operation of pumped storage and conventional hydropower includes: Obtaining operating parameters; the operating parameters include: the required total load at each moment in the dispatching cycle issued by the power grid and the equipment information of each hydropower plant; the equipment information includes: the number of reservoirs, the performance parameters of each pumped-storage power station, the limiting parameters of each reservoir and the inflow flow of the reservoir at each moment; the reservoir includes: an upper reservoir and a lower reservoir, and one reservoir corresponds to at least one of a pumped-storage power station and conventional hydropower; the performance parameters include: power generation efficiency, pumping status, minimum pumping output, maximum pumping output, minimum power generation output, maximum power generation output, minimum value of power generation flow, maximum value of power generation flow, minimum value of pumping flow and maximum value of pumping flow; the limiting parameters include: upper limit of storage capacity, lower limit of storage capacity, minimum output, maximum output, minimum downstream flow and maximum downstream flow; Based on the operating parameters, the energy conversion characteristics of the pumped storage power station are determined, and an objective function and constraint conditions are constructed; the objective function takes the minimum total water consumption for power generation in the reservoir as the goal; the constraint conditions include: water balance and reservoir capacity constraint, output constraint, pumped storage balance constraint and downstream flow constraint; Under different power generation and pumping modes of the pumped storage power station, the objective function is solved with the constraint condition as a constraint to obtain the storage capacity of each lower reservoir at each moment in the dispatching cycle under different power generation and pumping modes; Based on the storage capacity of each lower reservoir at each moment in the dispatching cycle under different power generation and pumping modes, the water level process of each lower reservoir within the dispatching cycle under different power generation and pumping modes is determined; the water level process includes: the water level at each moment.

2. The method for predicting the reservoir water level process when pumped storage and conventional hydropower are operated in combination according to claim 1, characterized in that: The energy conversion characteristics include: in, is the power generation of the pumped storage power station at time t; is the average generating head of the pumped storage power station at time t; is the water consumption of the pumped storage power station at time t; η s gen The power generation efficiency of pumped storage power stations; is the pumping power consumption of the pumped storage power station at time t; is the average pumping head of the pumped storage power station at time t; is the pumped storage flow of the pumped storage power station at time t; It is the operating efficiency of the pumped storage power station under pumping state.

3. The method for predicting the reservoir water level process when pumped storage and conventional hydropower are operated in combination according to claim 2, characterized in that: The objective function includes: Among them, W out is the target value of total water consumption for power generation in the reservoir; T is the dispatching period; N is the number of reservoirs; is the outflow of the ith reservoir at time t; Δt is the time granularity.

4. The method for predicting the reservoir water level process when pumped storage and conventional hydropower are operated in combination according to claim 3, characterized in that: The water balance and reservoir capacity constraints include: in, is the storage capacity of the upper storage at time t+1; is the storage capacity of the upper storage at time t; is the storage capacity of the lower storage at time t+1; is the storage capacity of the lower storage at time t; is the inflow flow of the lower storage at time t; is the outbound flow of the next warehouse at time t; V i t+1 is the storage capacity of the i-th reservoir at time t+1; is the storage capacity of the i-th reservoir at time t; is the inflow of the i-th reservoir at time t; V i max is the upper limit of the storage capacity of the i-th reservoir; V i min is the lower limit of the storage capacity of the ith reservoir.

5. The method for predicting the reservoir water level process when pumped storage and conventional hydropower are operated in combination according to claim 4, characterized in that: The output constraints include: in, is the total output of each reservoir at time t; L t is the total load required at time t; P i t is the output of the i-th reservoir at time t; P i min is the minimum output of the i-th reservoir; P i max is the maximum output of the i-th reservoir; P s pump,min It is the minimum pumping output of the pumped storage power station; is the maximum pumping output of the pumped storage power station; P s gen,min is the minimum power output of the pumped storage power station; P s gen,max It is the maximum power generation output of a pumped storage power station.

6. The method for predicting the reservoir water level process when pumped storage and conventional hydropower are operated in combination according to claim 5, characterized in that: The pumped storage balance constraint includes: Among them, T s pump The pumping time for pumped storage power stations; is the pumping flow of the pumped storage power station; T s gen The power generation time of the pumped storage power station; It is the power generation flow of the pumped storage power station.

7. The method for predicting the reservoir water level process when pumped storage and conventional hydropower are operated in combination according to claim 6, characterized in that: The downstream flow restriction includes: in, is the minimum value of the power generation flow of the pumped storage power station; is the maximum value of the power generation flow of the pumped storage power station; is the minimum pumping flow rate of the pumped storage power station; and is the maximum value of the pumped flow rate of the pumped storage power station; is the minimum discharge flow of the i-th reservoir; Q i t is the discharge of the ith reservoir at time t; is the maximum discharge flow of the ith reservoir.

8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for predicting the reservoir water level process when pumped storage and conventional hydropower are operated in conjunction as described in any one of claims 1 to 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for predicting the reservoir water level process when pumped storage and conventional hydropower are jointly operated as described in any one of claims 1 to 7 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for predicting the reservoir water level process when pumped storage and conventional hydropower are jointly operated as described in any one of claims 1 to 7 is implemented.

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