A step water-light storage complementary planning and scheduling method and system

Abstract

The application provides a kind of step water-light storage complementary planning scheduling method and system, belong to the field of power system operation control, comprising: according to the total guaranteed power of step water-light storage complementary system in the unit time period in scheduling period, calculate the target power of step water-light storage complementary system in each unit time period to power grid;According to the total guaranteed power and the total resource power of water-light in any unit time period, calculate the total regulating power of step water-light storage complementary system in any unit time period;According to the total regulating power and the preset quota coefficient corresponding to each reservoir in step water-light storage complementary system, determine the regulating power of each reservoir;According to the regulating power of each reservoir and potential energy analysis formula, determine the water level change of each reservoir.The application establishes the distribution scheduling model based on the analytical expression of reservoir power generation potential energy, converts the traditional high-dimensional nonlinear programming problem of reservoir optimal scheduling into algebraic solution problem, so as to improve the efficiency and stability when calculating the water level change of reservoir.

Description

Technical Field

[0001] This invention relates to the field of power system operation and control technology, and in particular to a cascade hydropower-solar-storage complementary planning and scheduling method and system. Background Technology

[0002] With the deepening of energy structure transformation, cascade hydropower-photovoltaic-storage complementary systems, which combine cascade hydropower stations with large-scale photovoltaic power stations and pumped storage power stations, are playing an increasingly important role in new power systems. However, the randomness and volatility of photovoltaic output pose significant challenges to the safe and stable operation of the power grid. To mitigate these fluctuations, the regulation capabilities of conventional hydropower stations and pumped storage power stations are typically used to compensate for and optimize unstable photovoltaic output.

[0003] The key to achieving efficient operation of hydro-solar hybrid systems lies in the optimized scheduling of cascade hydro-solar-storage hybrid systems. In existing technologies, reservoir scheduling is typically based on mathematical models of water balance and energy calculation. However, when these models are applied to cascade systems with multiple reservoirs and long scheduling cycles, the variables and constraints increase exponentially. Furthermore, due to the coupling of hydraulic and electrical connections between upstream and downstream reservoirs, there are complex nonlinear relationships between power generation and water level / flow, leading to the need for complex optimization algorithms and lengthy iterative calculations to solve such models. These factors result in poor efficiency and stability when solving for water level changes in each reservoir within the scheduling model. Summary of the Invention

[0004] This invention provides a planning and scheduling method and system for cascade hydro-solar-storage complementary systems, which addresses the shortcomings of existing technologies and improves the efficiency and stability of calculating the water level changes of each reservoir in the planning and scheduling optimization of cascade hydro-solar-storage complementary systems.

[0005] This invention provides a method for planning and scheduling cascade hydro-solar-storage complementary systems, comprising the following steps:

[0006] The total guaranteed power of the cascade hydro-solar-storage complementary system within a unit time period during the scheduling cycle is taken as the target power that the cascade hydro-solar-storage complementary system delivers to the grid in each unit time period.

[0007] Based on the total guaranteed power and the total hydro-solar power in any given time period, calculate the total regulating power of the cascade hydro-solar-storage complementary system in any given time period;

[0008] Based on the total regulating power and the preset quota coefficients corresponding to each reservoir in the cascade hydro-solar-storage complementary system, the regulating power to be undertaken by each reservoir is determined.

[0009] Based on the analysis formulas for regulating power and potential energy of each reservoir, the required water level change for each reservoir is determined.

[0010] According to the present invention, a cascade hydro-solar-storage complementary system planning and scheduling method further includes, before calculating the target power delivered by the cascade hydro-solar-storage complementary system to the power grid in each unit time period based on the total guaranteed power of the cascade hydro-solar-storage complementary system within the scheduling cycle, the method further includes:

[0011] For the unit time period, the hydropower resources of the reservoirs in the cascade hydro-solar-storage complementary system are calculated based on the hydrological data of the reservoirs in the cascade hydro-solar-storage complementary system.

[0012] For the unit time period, the photovoltaic power generation of the cascade hydro-solar-storage complementary system is calculated based on the photovoltaic resource data of the cascade hydro-solar-storage complementary system.

[0013] For the unit time period, the curtailed solar power of the cascade hydro-solar-storage complementary system is calculated based on the external power transmission channel capacity threshold, the peak photovoltaic output, and the installed capacity of the pumped storage power station. The effective photovoltaic power is then calculated based on the photovoltaic resource power and the curtailed solar power.

[0014] Within the scheduling cycle, the average hydropower resources and the average effective photovoltaic resources of the reservoirs in the cascade hydropower-solar-storage complementary system are calculated for each unit time period based on the hydropower resources and the effective photovoltaic resources of the reservoirs in each unit time period.

[0015] The total guaranteed power generation per unit time period within the scheduling cycle is obtained by summing the average hydropower power generation per unit time period and the average effective photovoltaic power generation per unit time period.

[0016] ;

[0017] In the formula, The total guaranteed power capacity; For the first j Hydropower resources and electricity volume per unit time period; For the first j The effective photovoltaic power generation per unit time period; N The number of time slots contained in a scheduling cycle.

[0018] According to the present invention, a method for planning and scheduling cascade hydro-solar-storage complementary systems is provided, wherein calculating the hydropower resources of the reservoirs in the cascade hydro-solar-storage complementary system based on the hydrological data of the reservoirs in the system includes:

[0019] The hydropower resources are calculated based on the efficiency of the hydropower units in all reservoirs, the density of water, the inflow rate, and the effective head for power generation.

[0020] ;

[0021] In the formula, The amount of hydropower resources per unit time period; η For the efficiency of hydroelectric generator units; The specific gravity of the water; The inbound flow rate; h The effective head for power generation is described above.

[0022] According to the present invention, a method for planning and scheduling cascade hydro-solar-storage complementary systems is provided, wherein calculating the photovoltaic power generation of the cascade hydro-solar-storage complementary system based on the photovoltaic resource data of the system includes:

[0023] The photovoltaic power generation capacity is calculated based on the photovoltaic power station installed capacity in the cascade hydro-solar-storage complementary system, the solar radiation intensity under standard test conditions, the solar radiation intensity during each photovoltaic power generation period, the solar panel temperature during each photovoltaic power generation period, the solar panel temperature under standard test conditions, and the air-temperature power conversion coefficient.

[0024] ;

[0025] In the formula, The amount of electricity generated by the photovoltaic resources; and These are the start and end times of photovoltaic power generation per unit time period, respectively. The installed capacity of the photovoltaic power station; and Each refers to any time within the unit time period. t Solar radiation intensity under normal conditions and solar radiation intensity under standard test conditions; and Each refers to any time within the unit time period. t Solar panel temperature under normal conditions and solar panel temperature under standard test conditions; The temperature-power conversion coefficient is denoted as .

[0026] According to a cascade hydro-solar-storage complementary planning and scheduling method provided by the present invention, for the unit time period, the method calculates the curtailed solar power of the cascade hydro-solar-storage complementary system based on the external power transmission channel capacity threshold, the peak photovoltaic output, and the installed capacity of the pumped storage power station, and calculates the effective photovoltaic power based on the photovoltaic resource power and the curtailed solar power, including:

[0027] For the unit time period, the amount of curtailed solar power is calculated based on the peak photovoltaic output of the cascade hydro-solar-storage complementary system, the installed capacity of the pumped storage power station, the capacity threshold of the external power transmission channel, the duration of photovoltaic power generation, and the correction coefficient.

[0028] ;

[0029] In the formula, The amount of light discarded; T The duration of photovoltaic power generation; P The peak value of the photovoltaic output; The threshold value for the external power transmission channel capacity; The correction coefficient is mentioned above;

[0030] The effective photovoltaic power is obtained based on the difference between the photovoltaic power generated and the curtailed power.

[0031] ;

[0032] In the formula, The effective photovoltaic power generation, The amount of electricity generated by the photovoltaic resources. The amount of light energy wasted is [the amount of light energy discarded].

[0033] According to the present invention, a cascade hydro-solar-storage complementary planning and scheduling method is provided, wherein calculating the total regulating power of the cascade hydro-solar-storage complementary system in any given unit time period based on the total guaranteed power and the total hydro-solar resource power in any given unit time period includes:

[0034] The total hydropower and photovoltaic power generated per unit time period is obtained by summing the hydropower and photovoltaic power generated per unit time period.

[0035] ;

[0036] In the formula, The total power of the water-solar resources; The amount of hydropower resources per unit time period; The effective photovoltaic resource power;

[0037] The total regulated power of the cascade hydro-solar-storage complementary system in the unit time period is obtained based on the difference between the total guaranteed power of the cascade hydro-solar-storage complementary system in the unit time period and the total hydro-solar resource power in the unit time period.

[0038] ;

[0039] In the formula, The total regulating power; The total guaranteed power capacity; The total power generation of the water-solar resources is denoted as .

[0040] According to the present invention, a cascade hydro-solar-storage complementary planning and scheduling method is provided, wherein determining the regulation power to be undertaken by each reservoir based on the total regulation power and the preset quota coefficient corresponding to each reservoir in the cascade hydro-solar-storage complementary system includes:

[0041] The regulating power of each reservoir is obtained by multiplying the total regulating power by the preset quota coefficient corresponding to each reservoir in the cascade hydro-solar-storage complementary system.

[0042] ;

[0043] In the formula, For any one of the cascade hydro-solar-storage complementary systems i The regulating power of each reservoir; For any number i The preset quota coefficient for each reservoir; This refers to the total regulating power.

[0044] According to the cascade hydro-solar-storage complementary planning and scheduling method provided by the present invention, before determining the required water level change of each reservoir based on the regulation power and potential energy analysis formula of each reservoir, the method further includes:

[0045] Based on the reservoir capacity-water level relationship data of each reservoir, a quadratic curve is fitted to obtain the quadratic function relationship;

[0046] ;

[0047] In the formula, W For any reservoir capacity; f () is a quadratic function; h The effective head for power generation; a, b, and c are all fitting parameters;

[0048] Based on the quadratic function relationship, a cubic polynomial analytical expression with effective power generation head as the independent variable and power generation potential energy as the dependent variable is obtained through integration.

[0049] ;

[0050] In the formula, Ω() is the power generation potential energy function; η For the efficiency of hydroelectric generator units; The specific gravity of water;

[0051] Based on the analytical expression of the cubic polynomial, the potential energy analysis formula is obtained; wherein, the potential energy analysis formula is a functional relationship between the power generation generated by the inflow at any time period and the difference between the power generation potential energy value corresponding to the water level at the end of the unit time period and the power generation potential energy value corresponding to the water level at the beginning.

[0052] ;

[0053] In the formula, E The power generation of any reservoir within the specified unit time period; To maintain a constant reservoir water level Under the condition of inbound flow The amount of electricity generated The change in reservoir water level at the end of the unit time period compared to the beginning of the unit time period.

[0054] The cascade hydro-solar-storage complementary planning and scheduling method provided by the present invention further includes:

[0055] Update the water levels of each reservoir based on the aforementioned water level changes;

[0056] When the updated water level is determined to be between the normal water storage level and the dead water level of the reservoir, the scheduling for the current unit time period is completed.

[0057] When it is determined that the updated water level is not between the normal storage level and the dead water level, the preset quota coefficients corresponding to each reservoir are adjusted and recalculated until the updated water level is between the normal storage level and the dead water level.

[0058] The cascade hydro-solar-storage complementary planning and scheduling method provided by the present invention further includes:

[0059] After the entire scheduling cycle ends, the water level change curves of each reservoir, the target power curve of the cascade hydro-solar-storage complementary system, and the curtailment rate of solar power are generated and output.

[0060] This invention also provides a cascade hydro-solar-storage complementary planning and scheduling system, comprising the following modules:

[0061] The first processing module is used to take the total guaranteed power of the cascade hydro-solar-storage complementary system in a unit time period within the scheduling cycle as the target power that the cascade hydro-solar-storage complementary system will transmit to the grid in each unit time period.

[0062] The second processing module is used to calculate the total regulating power of the cascade hydro-solar-storage complementary system in any given unit time period based on the total guaranteed power and the total hydro-solar resource power in any given unit time period.

[0063] The third processing module is used to determine the amount of regulation power that each reservoir needs to undertake based on the total regulation power and the preset quota coefficient corresponding to each reservoir in the cascade hydro-solar-storage complementary system.

[0064] The fourth processing module is used to determine the required water level change for each reservoir based on the regulation power and potential energy analysis formulas for each reservoir.

[0065] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the cascade hydro-solar-storage complementary planning and scheduling method as described above.

[0066] The present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the cascade hydro-solar-storage complementary planning and scheduling method as described above.

[0067] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the cascade hydro-solar-storage complementary planning and scheduling method as described above.

[0068] In summary, one or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0069] Based on the total guaranteed power output of the cascade hydro-solar-storage complementary system per unit time period within the scheduling cycle, the target power output delivered by the cascade hydro-solar-storage complementary system to the grid in each unit time period is calculated. This allows the highly volatile and random photovoltaic power output to be transformed into stable power transmission through the regulation of conventional hydropower and pumped storage power stations, providing the grid with a high-guarantee-rate hydro-solar clean energy guarantee power output. By calculating the total guaranteed power output and the total hydro-solar resource power output in any unit time period, the total regulation power output of the cascade hydro-solar-storage complementary system in any unit time period is calculated, thus accurately quantifying the power output that needs to be absorbed or compensated by the cascade reservoir group in each unit time period. Based on the total regulation power output and the preset quota coefficients corresponding to each reservoir in the cascade hydro-solar-storage complementary system, the regulation power output to be undertaken by each reservoir is determined. By using the regulation power output and potential energy analysis formulas for each reservoir, the required water level change for each reservoir is determined. This transforms the time-by-time differential calculation in the traditional cascade reservoir joint scheduling model into an analytical solution, avoiding the dimensionality curse problem of high-dimensional nonlinear calculations in traditional methods and significantly improving computational efficiency and stability. Attached Figure Description

[0070] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0071] Figure 1 This is one of the flowcharts of the cascade hydro-solar-storage complementary planning and scheduling method provided by the present invention.

[0072] Figure 2This is the second flowchart of the cascade hydro-solar-storage complementary planning and scheduling method provided by the present invention.

[0073] Figure 3 This is a schematic diagram of a typical daily photovoltaic power output distribution curve provided by the present invention.

[0074] Figure 4 This is a schematic diagram of the abandoned light power provided by the present invention.

[0075] Figure 5 This is a schematic diagram of a simplified triangular method for calculating curtailed solar power without considering pumped storage power stations, provided by the present invention.

[0076] Figure 6 This is a schematic diagram of calculating the amount of curtailed solar power under the conditions of pumped storage power stations provided by the present invention.

[0077] Figure 7 This is a schematic diagram of the structure of the cascade hydro-solar-storage complementary planning and scheduling system provided by the present invention.

[0078] Figure 8 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0079] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0080] It should be noted that in the description of this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The terms "upper," "lower," etc., indicating orientation or positional relationships according to the accompanying drawings, are only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0081] The terms "first," "second," etc., used in this invention are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, a first object can be one or more. Furthermore, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0082] The following is combined Figures 1 to 8 This invention describes the cascade hydro-solar-storage complementary planning and scheduling method, system, electronic equipment, storage medium, and computer program product provided by this invention.

[0083] Reference Figure 1 , Figure 1 This is one of the flowcharts illustrating the cascade hydro-solar-storage complementary planning and scheduling method provided by the present invention, such as... Figure 1 As shown, steps 101 to 104 are included:

[0084] Step 101: Based on the total guaranteed power of the cascade hydro-solar-storage complementary system per unit time period within the scheduling cycle, calculate the target power that the cascade hydro-solar-storage complementary system will deliver to the grid per unit time period.

[0085] In this embodiment, a scheduling cycle can be one week, and a unit time period can be one day. The total guaranteed power generation of all reservoirs in each unit time period within the scheduling cycle refers to the total resource power that the jointly operating reservoir group and its supporting photovoltaic power station can generate within one day. Based on this total guaranteed power generation, subsequent calculations can be performed.

[0086] Specifically, the total guaranteed power output of all reservoirs and photovoltaic units within the cascade hydro-solar-storage system for each unit time period during the scheduling cycle is taken as the target power output that the cascade hydro-solar-storage system must constantly supply to the grid for each unit time period. This target power output is a constant value that remains unchanged throughout the entire scheduling cycle, serving as the committed power output of the cascade hydro-solar-storage system to the grid. This calculation process aims to average the fluctuating total hydro-solar resource power output over multiple unit time periods into a constant output value with a high guarantee rate.

[0087] In one possible implementation, refer to Figure 2 , Figure 2 This is the second flowchart of the cascade hydro-solar-storage complementary planning and scheduling method provided by the present invention. Before step 101, the method further includes the following steps:

[0088] Step 201: For a unit time period, calculate the hydropower resources of the reservoirs in the cascade hydro-solar-storage complementary system based on the hydrological data of the reservoirs in the cascade hydro-solar-storage complementary system.

[0089] Step 202: For a unit time period, calculate the photovoltaic power generation in the cascade hydro-solar-storage complementary system based on the photovoltaic resource data.

[0090] Step 203: For a unit time period, calculate the curtailed solar power of the cascade hydro-solar-storage complementary system based on the external power transmission channel capacity threshold, the peak photovoltaic output, and the installed capacity of the pumped storage power station. Calculate the effective photovoltaic power based on the photovoltaic resource power and the curtailed solar power.

[0091] Step 204: For the scheduling cycle, calculate the average hydropower resources and the average effective photovoltaic resources of the reservoirs in the cascade hydropower-solar-storage complementary system for each unit time period, based on the hydropower resources and effective photovoltaic resources of the reservoirs in each unit time period.

[0092] Step 205: Summing the average hydropower resources and the average effective photovoltaic resources within a unit time period yields the total guaranteed power within a unit time period during the scheduling cycle.

[0093] Specifically, for any given time period, the hydropower resources of all reservoirs are first calculated based on their hydrological data. In this embodiment, the hydrological data of all reservoirs mainly refers to the inflow data of each reservoir.

[0094] In one specific implementation, step 201 specifically includes the following steps:

[0095] Calculate the hydropower resources based on the efficiency of the hydropower units in all reservoirs, the density of water, the inflow rate, and the effective head for power generation.

[0096] Specifically, hydrological data includes unit efficiency. The density of water Inbound flow and effective hydroelectric head Among them, unit efficiency is the efficiency coefficient of the hydro-generator unit in converting water energy into electrical energy; the specific gravity of water is a physical constant; the inflow rate is directly derived from the input hydrological data; and the effective power generation head is the difference between the upstream and downstream water levels of the reservoir.

[0097] The hydropower resources are calculated based on the unit efficiency, water density, inflow, and effective head of all reservoirs. Specifically, the hydropower resources are... The calculation formula is:

[0098]

[0099] In the formula, The amount of hydropower resources per unit time period; η For the efficiency of hydroelectric generator units; The specific gravity of water; This represents the average inbound flow rate per unit time period. h This is the effective head for power generation. Using this formula, the inflow hydropower resources of a reservoir can be converted into the corresponding power generation capacity of a hydropower station.

[0100] Further, in step 202, for a given time period, the photovoltaic power generation in the cascaded hydro-solar-storage complementary system is calculated based on the photovoltaic resource data.

[0101] In one specific implementation, step 202 specifically includes the following steps:

[0102] The photovoltaic power generation capacity is calculated based on the installed capacity of the photovoltaic power station in the cascade hydro-photovoltaic-storage complementary system, the solar radiation intensity under standard test conditions, the solar radiation intensity during each photovoltaic power generation period, the solar panel temperature during each photovoltaic power generation period, the solar panel temperature under standard test conditions, and the air-to-power conversion coefficient.

[0103] Photovoltaic data includes the installed capacity of photovoltaic power stations in all reservoirs. Solar radiation intensity at any time t within a unit time period under standard test conditions Solar radiation intensity at any time t within a unit time period The temperature of the solar panel at any time t within a unit time period The temperature of the solar panel under standard test conditions at any time t within a unit time period. and temperature-power conversion coefficient Therefore, the formula for calculating the amount of electricity generated by photovoltaic resources is as follows:

[0104]

[0105] In the formula, For photovoltaic power generation; and These represent the start and end times of photovoltaic power generation per unit time period, respectively. For the installed capacity of photovoltaic power plants; and Each represents any time within a unit of time. t Solar radiation intensity under normal conditions and solar radiation intensity under standard test conditions; and Each represents any time within a unit of time. t Solar panel temperature under normal conditions and solar panel temperature under standard test conditions; This is the temperature-power conversion coefficient.

[0106] Next, step 203 is executed. For each unit time period, the curtailed solar power of the cascade hydro-solar-storage complementary system is calculated based on the external power transmission channel capacity threshold, the peak photovoltaic output, and the installed capacity of the pumped storage power station. The effective photovoltaic power is then calculated based on the photovoltaic resource power and the curtailed solar power.

[0107] In one specific implementation, step 203 specifically includes the following steps:

[0108] For a given time period, the amount of curtailed solar power is calculated based on the peak output of the photovoltaic power in the cascade hydro-solar-storage complementary system, the installed capacity of the pumped storage power station, the capacity threshold of the external power transmission channel, the duration of photovoltaic power generation, and the correction factor.

[0109] The effective photovoltaic power is obtained by calculating the difference between the photovoltaic power generated and the curtailed power.

[0110] Specifically, the preset amount of abandoned solar power is determined in the following way.

[0111] Reference Figure 3 , Figure 3 This is a schematic diagram of a typical daily photovoltaic power output distribution curve provided by the present invention. According to... Figure 3 A diagram illustrating light absconding can be obtained, for reference. Figure 4 , Figure 4 This is a schematic diagram of the amount of abandoned solar power provided by the present invention. Further according to... Figure 4 By performing a simplified triangular analysis, a schematic diagram for calculating the wasted solar power under the simplified triangular conditions can be obtained, as shown in the reference. Figure 5 , Figure 5 This is a schematic diagram of a simplified triangular method for calculating curtailed solar power without considering pumped storage power stations, provided by the present invention. Figure 5 As shown, the total area of ​​the entire triangle is: Furthermore, we can deduce that: , , ,in, For the peak power output of photovoltaic daily, Where L is the transmission channel capacity threshold, and L is the curtailment duration within a unit time period. According to... Figure 5 Further analysis of curtailment of solar power under the condition of pumped storage power stations was conducted, resulting in a schematic diagram for calculating curtailed solar power considering pumped storage power stations. (Refer to...) Figure 6 , Figure 6 This is a schematic diagram of calculating the amount of curtailed solar power under the conditions of pumped storage power stations provided by the present invention. Figure 6 upper base of the mid-waisted trapezoidal shaded area It can be obtained through the following formula: ; y is the total time period of the scheduling period, which is the lower base of the shaded part of the isosceles trapezoid; y is half the difference between the lower base and the upper base of the shaded part of the isosceles trapezoid. This refers to the installed capacity of the pumped-storage hydroelectric power station, i.e., the height of the shaded portion of the isosceles trapezoid. Curtailed solar power. It is calculated using the following formula:

[0112]

[0113] According to Figure 6 As shown, Therefore, we can conclude that:

[0114]

[0115] In the formula, This refers to the amount of electricity discarded from the light source; T This refers to the duration of photovoltaic power generation. P Peak photovoltaic power output; This refers to the installed capacity of pumped storage power stations; This refers to the capacity threshold for external power transmission channels; This is a correction factor.

[0116] The net photovoltaic (PV) power generation, obtained by subtracting the curtailed PV power from the total PV power generated, represents the actual effective PV power available for grid connection. The specific formula for calculating the effective PV power is as follows:

[0117]

[0118] In the formula, To effectively utilize photovoltaic power resources, For photovoltaic power generation, This refers to the amount of electricity wasted from light.

[0119] Further, in step 204, for each scheduling cycle, the average hydropower resources and the average effective photovoltaic resources of the reservoirs in the cascade hydropower-solar-storage complementary system are calculated based on the hydropower resources and effective photovoltaic resources of the reservoirs in each unit time period.

[0120] Specifically, the average amount of electricity generated by hydropower resources can be expressed by the following formula: In the formula, For the first j Hydropower resources and electricity volume per unit time period; N The number of time slots contained in a scheduling cycle.

[0121] The average effective photovoltaic power generation can be expressed by the following formula: In the formula, For the first j Hydropower resources and electricity volume per unit time period; NThe number of time slots contained in a scheduling cycle.

[0122] Further, step 205 is executed: based on the average hydropower energy per unit time period and the average effective photovoltaic energy per unit time period, the total guaranteed energy per unit time period within the scheduling cycle is obtained by summing them.

[0123] The specific formula for calculating the total guaranteed power is as follows:

[0124]

[0125] In the formula, To ensure total power supply.

[0126] Step 102: Calculate the total regulating power of the cascade hydro-solar-storage complementary system in any unit time period based on the total guaranteed power and the total hydro-solar power resources in any unit time period.

[0127] Because the power generation capacity of hydropower and photovoltaic power fluctuates daily during the dispatch cycle, while the target power output to the grid is constant, there will be a difference between the actual daily power generation capacity and the power transmission target. To effectively regulate and manage this difference, it is necessary to first quantify it accurately. This step aims to calculate the daily power volume that needs to be absorbed or compensated by the cascade reservoir group, providing clear quantitative indicators for subsequently allocating regulation tasks to individual reservoirs.

[0128] In one specific implementation, step 102 specifically includes the following steps:

[0129] First, the total hydropower and photovoltaic power per unit time period is obtained by summing the hydropower and photovoltaic power per unit time period.

[0130]

[0131] In the formula, The total power generation from hydropower and solar power; The amount of hydropower resources per unit time period; To generate electricity from effective photovoltaic resources.

[0132] Next, based on the difference between the total guaranteed power of the cascade hydro-solar-storage complementary system per unit time period and the total hydro-solar resource power per unit time period, the total regulated power of the cascade hydro-solar-storage complementary system per unit time period can be obtained.

[0133]

[0134] In the formula, Total regulating power; To ensure total power supply; This represents the total electricity generated by hydropower and solar power.

[0135] In this embodiment, the calculation process is performed within any given time period (e.g., a day).

[0136] The positive or negative value of the calculated total regulating power has a clear physical meaning. When the total guaranteed power is less than the target power, the calculated total regulating power is positive, indicating that there is a power shortage in the current period, and the reservoir needs to increase power generation by lowering the water level to make up for the difference. Conversely, when the total guaranteed power is greater than the target power, the calculated total regulating power is negative, indicating that there is a power surplus in the current period, and the reservoir needs to reduce power generation by raising the water level to store this excess energy for use in subsequent periods. This calculation is performed one by one for each unit period within the scheduling cycle.

[0137] Step 103: Determine the amount of regulation power to be undertaken by each reservoir based on the total regulation power and the preset quota coefficients corresponding to each reservoir in the cascade hydro-solar-storage complementary system.

[0138] After calculating the total regulating power of all reservoirs, this overall regulating task needs to be decomposed and assigned to each reservoir. This step aims to provide a clear and simple allocation method, transforming the overall regulating demand into independent and actionable regulating objectives for each reservoir, thereby decoupling and simplifying the complex problem of joint scheduling of cascade reservoirs.

[0139] In one specific implementation, step 103 specifically includes the following steps:

[0140] First, the allocated power to be borne by each reservoir is obtained by multiplying the total regulating power by the preset quota coefficient corresponding to each reservoir in the cascade hydro-solar-storage complementary system.

[0141] In this embodiment, a preset quota coefficient is used. This is the first i Each reservoir has a pre-set allocation ratio. This coefficient represents the share of regulation tasks that the reservoir should undertake in the joint regulation operation of the entire reservoir group, and its value can be determined based on the basic characteristic parameters of the reservoir, such as its regulation capacity and installed capacity. The sum of the quota coefficients of all reservoirs is 1.

[0142] The specific implementation method is to use the total regulating power calculated in the previous step. This is multiplied by the preset quota coefficient for each reservoir to obtain the regulated power output of each reservoir. For example, for the first... i The reservoir has a regulating power capacity of [number] units.

[0143]

[0144] In the formula, For any one of the cascade hydro-solar-storage complementary systems i The regulating power of each reservoir; For any number i The preset quota coefficient for each reservoir; This refers to the total regulating power.

[0145] After obtaining the regulating power of each reservoir, step 104 is finally executed: based on the regulating power and potential energy analysis formula of each reservoir, the required water level change of each reservoir is determined.

[0146] In one specific implementation, it is first necessary to determine the potential energy analysis formula. The specific steps for determining the potential energy analysis formula are as follows:

[0147] Based on the reservoir capacity-water level relationship data of each reservoir, a quadratic curve is fitted to obtain the quadratic function relationship;

[0148] Based on the quadratic function relationship, the analytical expression of a cubic polynomial with effective power generation head as the independent variable and power generation potential energy as the dependent variable is obtained through integration.

[0149] Based on the analytical expression of the cubic polynomial, the potential energy analysis formula is obtained; where the potential energy analysis formula is a functional relationship between the power generation generated by the inflow at any time period and the difference between the power generation potential energy value corresponding to the water level at the end of the unit time period and the power generation potential energy value corresponding to the water level at the beginning.

[0150] Specifically, in order to establish an analytical expression relationship between the regulation of electricity and the change of reservoir water level, and thus replace the cumbersome time-by-time differential calculation in the traditional cascade reservoir optimization scheduling, it is necessary to first derive the power generation potential energy formula with water level as the only independent variable from a theoretical perspective.

[0151] First, the reservoir's capacity-water level relationship data is obtained. This data is fundamental information characterizing the reservoir's physical morphology and is typically a series of discrete data points. To facilitate subsequent continuous function calculations, a quadratic curve is fitted to the capacity-water level relationship data to obtain a quadratic function relationship between capacity and water level. This step approximates the discrete capacity-water level relationship (Vh) as a continuous quadratic function, specifically expressed as follows:

[0152]

[0153] In the formula, W For any reservoir capacity; f () is a quadratic function; h The effective head for power generation; a, b, and c are all fitting parameters; this quadratic function relationship provides the premise for subsequent integral calculations.

[0154] After obtaining the quadratic function representing the reservoir capacity-water level relationship, based on the principles of hydropower, the generated energy is expressed as a function of the hydropower unit efficiency, water density, volume, and water level. Hydropower generation is essentially the process of converting the gravitational potential energy of water into the mechanical energy of the turbine and generator, and further into electrical energy. The total potential energy stored in the reservoir can be obtained by integrating the reservoir capacity-water level relationship function. Therefore, by integrating the function, a cubic polynomial analytical expression is obtained, with the effective generating head as the independent variable and the generating potential energy as the dependent variable. Since the reservoir capacity is approximated as a quadratic function of the effective generating head, integration naturally yields a higher-order function of the effective generating head, namely, a cubic polynomial analytical expression: , which is the power generation potential function of the reservoir, directly establishes an explicit mathematical expression between the power generation potential accumulated in the reservoir and the reservoir water level. In the formula, Ω() is the power generation potential function; η For the efficiency of hydroelectric generator units; It is the density of water.

[0155] Finally, based on the cubic polynomial analytical expression, the potential energy analysis formula is obtained. This formula is a functional relationship between the hydropower resources' electricity volume at any given time period and the difference between the power generation potential energy value corresponding to the water level at the end of that period and the power generation potential energy value corresponding to the initial water level. The hydropower resources' electricity volume is the power generated by the inflow under the condition of a constant initial water level.

[0156] The specific formula for potential energy analysis is as follows: In the formula, E The power generation of any reservoir within a unit of time period; To maintain a constant reservoir water level Under the condition of inbound flow The amount of electricity generated The change in reservoir water level at the end of the unit time period compared to the beginning of the unit time period.

[0157] The difference in power generation potential between the reservoir's final and initial states within a unit time period. This is used to characterize the power generation generated due to changes in reservoir water level within a given time period. The difference in power generation potential energy is then compared with the difference at a constant reservoir water level. Under the condition of inbound flow The generated electricity is added together to obtain the electricity generated by any reservoir per unit time period.

[0158] After obtaining the potential energy analysis formula, in order to convert the regulated power allocated to each reservoir into specific executable reservoir dispatch instructions, a method is needed to establish a direct relationship between the regulated power and the physical state of the reservoirs. This step aims to solve the "curse of dimensionality" problem caused by the cumbersome calculation process in traditional dispatch methods, and to quickly and accurately determine the water level adjustment amount required to complete the regulation task.

[0159] In this embodiment, the specific implementation method is to obtain the water level change required by each reservoir to complete the regulation of electricity based on the analysis formula of the regulation power and potential energy of each reservoir.

[0160] The potential energy analysis formula is used to characterize the potential energy of reservoir power generation as an analytical solution of the reservoir water level. This formula establishes a functional relationship between the potential energy of power generation (or the amount of regulated electricity) within a unit time period and the reservoir water level at the beginning and end of that period.

[0161] According to the foregoing embodiments, for the first i The potential energy analysis formula for a reservoir can be expressed as: Among them, the power generation potential energy function It is a polynomial about the water level; the power generation of any reservoir per unit time period is known, which is the regulation of power generation. Initial water level during the current period These are also known. Substituting these known quantities into the above potential energy analysis formula, we can obtain a value based on the change in water level. This is an algebraic equation with only one unknown. Since the power generation potential energy function is a cubic polynomial, this equation is a cubic equation in one variable. By solving the real solution of this equation, the amount of electricity required to complete the regulation can be directly calculated. Required water level change This method transforms the complex difference calculations involving multiple variables such as flow rate, head, and time in traditional optimization scheduling into a simple process of solving a cubic equation, fundamentally simplifying the model and greatly improving computational efficiency and stability.

[0162] In one possible implementation, after step 104, the following steps are further included:

[0163] Update the water levels of each reservoir based on the changes in water level.

[0164] When the updated water level is determined to be between the normal water storage level and the dead water level of the reservoir, the scheduling for the current unit time period is completed.

[0165] When it is determined that the updated water level is not between the normal water storage level and the dead water level of the reservoir, the preset quota coefficients of each reservoir are adjusted and recalculated until the updated water level is between the normal water storage level and the dead water level of the reservoir.

[0166] After calculating the water level changes required for each reservoir to complete the power allocation, the calculation results need to be technically verified to ensure that the scheduling plan will not cause the reservoir water levels to exceed their safe operating range.

[0167] Specifically, the water levels of each reservoir are first updated based on the water level changes. Specifically, the initial water level for the current unit of time is added to the water level change calculated in the previous step to obtain an updated water level. This updated water level represents the theoretical water level that the reservoir should reach at the end of the current unit of time after the assigned regulation tasks are performed.

[0168] After obtaining the updated water level, it is necessary to check its constraints. If the updated water level is determined to be between the normal storage level and the dead water level, the daily scheduling is completed. Here, the normal storage level refers to... This is the highest water level that a reservoir can reach under normal operating conditions, while the dead water level is... This is the lowest water level the reservoir is allowed to drop to, and together they constitute the water level constraint range for reservoir operation. If the calculated updated water level falls within this range, it indicates that the allocation of this regulation task is feasible, and the reservoir's scheduling calculation for the day is complete.

[0169] However, in some cases, the calculation results may exceed the water level constraints. When it is determined that the updated water level is not between the normal storage level and the dead water level, the preset quota coefficients corresponding to each reservoir are adjusted, and the allocated electricity and corresponding water level changes are recalculated until the updated water level is between the normal storage level and the dead water level of the reservoir. This situation means that if the updated water level of a reservoir is higher than its normal storage level or lower than its dead water level, it indicates that the initial regulation task allocation scheme is not feasible for that reservoir. At this time, a feedback adjustment mechanism needs to be activated. This mechanism is implemented by adjusting the preset quota coefficients corresponding to each reservoir. For example, the quota coefficient of the reservoir that caused the water level to exceed the limit is appropriately reduced, and the quota coefficients of other reservoirs with regulation margins are increased accordingly. After adjusting the quota coefficients, the process returns to step 103, where the total regulation electricity for the day is redistributed with the new coefficients, and the allocated electricity and corresponding water level changes of each reservoir are recalculated. Then, the water level constraint check is repeated. This iterative process will continue until a reasonable set of quota coefficients is found, so that the updated water levels of all reservoirs can meet their respective normal storage level and dead water level constraints.

[0170] In one possible implementation, after step 104, the following steps are further included:

[0171] After the entire scheduling cycle ends, the water level change curves of each reservoir, the target power curve of the cascade hydro-solar-storage complementary system, and the curtailment rate of solar power are generated and output.

[0172] To intuitively evaluate the calculation results of the entire scheduling cycle and provide clear information to operators, it is necessary to organize and visualize the large amount of data generated during the scheduling process. This step aims to summarize the calculation results scattered across various time periods and output them in the form of graphs and data.

[0173] The water level change curves for each reservoir are displayed graphically, showing the daily water level elevation of each reservoir throughout the entire scheduling cycle. For example, by calling a plotting function, the updated water level sequence after each daily scheduling is plotted as a line graph, with the horizontal axis representing the scheduling date and the vertical axis representing the reservoir water level. This curve can intuitively reflect the water level change scheduling process carried out by each reservoir to smooth out fluctuations in photovoltaic power generation output.

[0174] The target power output curve displays the target daily power output to the grid within a scheduling cycle. This curve is typically represented by a horizontal straight line running through the entire scheduling cycle, and its value equals the guaranteed power output calculated earlier. At output, this straight line can be compared with a bar chart representing the actual daily water and solar power output. Figure 1 The same plot is drawn to clearly compare the actual daily total hydropower and solar power generation with the constant power transmission target.

[0175] The curtailment rate is a key quantitative indicator, representing the percentage of curtailed solar power relative to the total solar power generated. This value can be output as an average over the entire scheduling cycle or as a daily curtailment rate to assess the utilization of solar power resources.

[0176] The generation and output process is achieved by calling the corresponding software libraries. For example, the graph file of the above curve is generated by calling the plotting library, and detailed data including daily curtailed solar power, total hydro-solar power resources and water level sequence are stored in a spreadsheet file by calling the report output library, which facilitates subsequent archiving and analysis.

[0177] Furthermore, to specifically illustrate the embodiments of the present invention,

[0178] In this embodiment, data input is performed first. A scheduling cycle of 7 days is set. For this scheduling cycle, the daily runoff data of a certain cascade reservoir is input, specifically the daily average inflow: 704, 811, 796, 704, 627, 572, and 545 m³. 3 / s. Simultaneously, the daily photovoltaic power generation is input, specifically 59.19 × 10⁻⁶. 6 56.36×10 6 29.97×10 6 54.51×10 6 52.55×10 6 63.21×10 648.03×10 6 kWh. In addition, the capacity threshold of the transmission channel is set at 7.0 MW, and the basic characteristic parameters such as the reservoir capacity-water level relationship parameters, dam crest elevation, normal storage water level, dead water level, downstream water level and starting regulation water level of the two hydropower stations A and B of a certain cascade reservoir are entered.

[0179] After inputting the data, a curtailment analysis of grid-connected photovoltaic power generation was performed. Based on the input daily photovoltaic power generation and transmission channel capacity thresholds, the daily effective photovoltaic power and curtailed photovoltaic power were calculated. The calculation results show that the daily effective photovoltaic power in this dispatch cycle is 53.70 × 10⁻⁶. 6 52.34×10 6 29.97×10 6 51.35×10 6 50.22×10 6 55.38×10 6 47.19×10 6 kWh. This process also yields curtailed solar power, with the highest single-day curtailment being 7.83 × 10⁻⁶ kWh. 6 kWh corresponds to a curtailment rate of approximately 12.4%.

[0180] Next, the guaranteed power supply is calculated. Using a 7-day scheduling cycle, the daily hydropower and effective photovoltaic power supply are added together to obtain the total daily hydropower and photovoltaic power supply. The arithmetic average of these 7 days' total hydropower and photovoltaic power supply is then calculated. The calculated average guaranteed power supply for this cycle is 85.05 × 10⁻⁶. 6 kWh, this value will be used as the target daily power output to the grid during this scheduling cycle.

[0181] Subsequently, daily power regulation allocation is carried out. For each day within the scheduling cycle, the total hydropower and solar power resources of that day are compared with the determined guaranteed power, and the total power regulation required by the cascade reservoirs for that day is calculated. Then, according to the preset quota coefficient (0.5, 0.5), the total power regulation is evenly allocated to hydropower station A and hydropower station B, thereby obtaining the power regulation to be undertaken by each hydropower station for that day.

[0182] After determining the regulating power capacity of each hydropower station, the water level changes of each station were calculated and corrected. Assuming that the initial regulating water levels of hydropower station A and hydropower station B at the beginning of a weekly regulating cycle are 2884.33m (elevation) and 2696.37m (elevation), respectively, their corresponding effective generating heads are 144.33m and 134.97m. Based on the regulating power capacity allocated to hydropower stations A and B, the water level changes required to complete the regulation were calculated using the potential energy analysis formula. The calculation results show that within a weekly regulating cycle, the water level fluctuations of hydropower stations A and B are approximately 2 meters and 1 meter, respectively. Simultaneously, the water levels after daily regulation were checked, and the results indicate that the water levels of both reservoirs are within their respective normal storage and dead storage ranges. In addition, after a one-week adjustment cycle, the water level of the reservoir of hydropower station A returned to the initial adjustment level (i.e., 2884.33m (elevation)) and the water level of the reservoir of hydropower station B returned to the initial adjustment level (i.e., 2696.37m (elevation)).

[0183] Finally, the results are output and analyzed. After completing the calculation for the entire scheduling cycle, visualized charts are automatically generated and output. These include a histogram showing the daily comparison between the power output and guaranteed power of the hydro-solar hybrid system, and a line graph showing the daily water level changes of hydropower station A and hydropower station B during the scheduling cycle. Simultaneously, detailed data, including daily curtailed solar power, total hydro-solar power resources, and water level sequences, are output to a spreadsheet file.

[0184] The results of this embodiment show that, compared with the nonlinear iterative calculation of the traditional cascade reservoir optimization scheduling model, the method of the present invention significantly reduces the amount of computation, and the calculation results are intuitive and stable, making it suitable for the planning and scheduling of large-scale cascade hydro-solar-storage complementary systems.

[0185] Furthermore, the method of the present invention can be implemented through software. In this embodiment, the software is partially developed based on the Python platform and adopts a modular architecture design. The overall design includes functions for data input and preprocessing, photovoltaic power analysis, hydropower calculation, scheduling optimization, water level change updates, and result output and visualization. These functions interact through function calls and data interfaces, forming a complete scheduling optimization and result analysis process. In terms of technical implementation details, the software development environment can use Python 3.x, numerical calculations can utilize the numpy library, plotting functions can utilize the matplotlib library, and report output can utilize the openpyxl library. In the core class design, a Reservoir class can be designed to store parameters of a single reservoir and information such as daily water level, reservoir capacity, and power generation potential. Simultaneously, a CRes_Opt class can be designed to manage the scheduling of the reservoir group, containing global variables such as scheduling cycle, guaranteed power, curtailed power, and regulated power, and encapsulating methods for scheduling solution, plotting, and output. In terms of the execution flow, the get_input() method is called to read input data; the Solar_E() method is called to analyze the amount of curtailed photovoltaic power; step_one_period() is called to complete single-cycle scheduling; Solver() is called to complete rolling calculations for all cycles; and finally, Draw() and OutputToExcel() are called to output the results.

[0186] Reference Figure 7 , Figure 7 This is a schematic diagram of the cascade hydro-solar-storage complementary planning and scheduling system provided by the present invention. The system includes:

[0187] The first processing module is used to take the total guaranteed power of the cascade hydro-solar-storage complementary system in a unit time period within the scheduling cycle as the target power that the cascade hydro-solar-storage complementary system transmits to the grid in each unit time period.

[0188] The second processing module is used to calculate the total regulating power of the cascade hydro-solar-storage complementary system in any unit time period based on the total guaranteed power and the total hydro-solar power resources in any unit time period.

[0189] The third processing module is used to determine the amount of regulation power each reservoir needs to undertake based on the total regulation power and the preset quota coefficients corresponding to each reservoir in the cascade hydro-solar-storage complementary system.

[0190] The fourth processing module is used to determine the required water level change for each reservoir based on the regulation power and potential energy analysis formulas for each reservoir.

[0191] In one possible implementation, the system further includes a fifth processing module for:

[0192] Based on the reservoir capacity-water level relationship data of each reservoir, a quadratic curve is fitted to obtain the quadratic function relationship;

[0193]

[0194] In the formula, W For any reservoir capacity; h The effective head for power generation; a, b, and c are all fitting parameters;

[0195] Based on the quadratic function relationship, the analytical expression of a cubic polynomial with effective power generation head as the independent variable and power generation potential energy as the dependent variable is obtained through integration.

[0196]

[0197] In the formula, Ω() is the power generation potential energy function; η For the efficiency of hydroelectric generator units; The specific gravity of water;

[0198] Based on the analytical expression of the cubic polynomial, the potential energy analysis formula is obtained; where the potential energy analysis formula is a functional relationship between the power generation generated by the inflow at any time period and the difference between the power generation potential energy value corresponding to the water level at the end of the unit time period and the power generation potential energy value corresponding to the water level at the beginning.

[0199]

[0200] In the formula, E The power generation of any reservoir within the specified unit time period; To maintain a constant reservoir water level Under the condition of inbound flow The amount of electricity generated The change in reservoir water level at the end of the unit time period compared to the beginning of the unit time period.

[0201] In one possible implementation, the fourth processing module is further configured to:

[0202] Update the water levels of each reservoir based on the changes in water level.

[0203] When the updated water level is determined to be between the normal water storage level and the dead water level of the reservoir, the scheduling for the current unit time period is completed.

[0204] When it is determined that the updated water level is not between the normal water storage level and the dead water level of the reservoir, the preset quota coefficients of each reservoir are adjusted and recalculated until the updated water level is between the normal water storage level and the dead water level of the reservoir.

[0205] In one possible implementation, the system further includes a sixth processing module for:

[0206] After the entire scheduling cycle ends, the water level change curves of each reservoir, the target power curve of the cascade hydro-solar-storage complementary system, and the curtailment rate of solar power are generated and output.

[0207] It should be noted that the cascade hydro-solar-storage complementary planning and scheduling system provided by the present invention can execute the cascade hydro-solar-storage complementary planning and scheduling method of any of the above embodiments during actual operation, which will not be elaborated in this embodiment.

[0208] Figure 8 This is a schematic diagram of the structure of the electronic device provided by the present invention, such as... Figure 8 As shown, the electronic device may include a processor 810, a communication interface 820, a memory 830, and a communication bus 840. The processor 810, communication interface 820, and memory 830 communicate with each other via the communication bus 840. The processor 810 can call logical instructions stored in the memory 830 to execute the cascade hydro-solar-storage complementary planning and scheduling method provided in the above embodiments.

[0209] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0210] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions, and when the program instructions are executed by the computer, the computer is able to execute the cascade hydro-solar-storage complementary planning and scheduling method provided in the above embodiments.

[0211] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, is implemented to perform the cascade hydro-solar-storage complementary planning and scheduling method provided in the above embodiments.

[0212] The system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0213] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0214] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cascade hydro-solar-storage complementary planning and scheduling method, characterized in that, include: For a unit time period within the scheduling cycle of a cascade hydro-solar-storage complementary system, the hydropower resources of the reservoirs in the cascade hydro-solar-storage complementary system are calculated based on the hydrological data of the reservoirs in the cascade hydro-solar-storage complementary system. For the unit time period, the photovoltaic power generation of the cascade hydro-solar-storage complementary system is calculated based on the photovoltaic resource data of the cascade hydro-solar-storage complementary system. For the unit time period, the curtailed solar power of the cascade hydro-solar-storage complementary system is calculated based on the external power transmission channel capacity threshold, the peak photovoltaic output, and the installed capacity of the pumped storage power station. The effective photovoltaic power is then calculated based on the photovoltaic resource power and the curtailed solar power. Within the scheduling cycle, the average hydropower resources and the average effective photovoltaic resources of the reservoirs in the cascade hydropower-solar-storage complementary system are calculated for each unit time period based on the hydropower resources and the effective photovoltaic resources of the reservoirs in each unit time period. The total guaranteed power generation per unit time period within the scheduling cycle is obtained by summing the average hydropower power generation per unit time period and the average effective photovoltaic power generation per unit time period. ； In the formula, The total guaranteed power capacity; For the first j Hydropower resources and electricity volume per unit time period; For the first j The effective photovoltaic power generation per unit time period; N The number of time slots contained in a scheduling cycle; The total guaranteed power of the cascade hydro-solar-storage complementary system within a unit time period during the scheduling cycle is taken as the target power that the cascade hydro-solar-storage complementary system delivers to the grid in each unit time period. Based on the total guaranteed power and the total hydro-solar power in any given time period, calculate the total regulating power of the cascade hydro-solar-storage complementary system in any given time period; Based on the total regulating power and the preset quota coefficients corresponding to each reservoir in the cascade hydro-solar-storage complementary system, the regulating power to be undertaken by each reservoir is determined. Based on the analysis formulas for regulating power and potential energy of each reservoir, the required water level change for each reservoir is determined.

2. The cascade hydro-solar-storage complementary planning and scheduling method according to claim 1, characterized in that, The step of calculating the hydropower resources of the reservoirs in the cascade hydro-solar-storage complementary system based on the hydrological data of the reservoirs includes: The hydropower resources are calculated based on the efficiency of the hydropower units in all reservoirs, the density of water, the inflow rate, and the effective head for power generation. ； In the formula, The amount of hydropower resources per unit time period; η For the efficiency of hydroelectric generator units; The specific gravity of the water; The inbound flow rate; h The effective head for power generation is described above.

3. The cascade hydro-solar-storage complementary planning and scheduling method according to claim 1, characterized in that, The step of calculating the photovoltaic power generation of the cascaded hydro-solar-storage complementary system based on the photovoltaic resource data includes: The photovoltaic power generation capacity is calculated based on the photovoltaic power station installed capacity in the cascade hydro-solar-storage complementary system, the solar radiation intensity under standard test conditions, the solar radiation intensity during each photovoltaic power generation period, the solar panel temperature during each photovoltaic power generation period, the solar panel temperature under standard test conditions, and the air-temperature power conversion coefficient. ； In the formula, The amount of electricity generated by the photovoltaic resources; and These are the start and end times of photovoltaic power generation per unit time period, respectively. The installed capacity of the photovoltaic power station; and Each refers to any time within the unit time period. t Solar radiation intensity under normal conditions and solar radiation intensity under standard test conditions; and Each refers to any time within the unit time period. t Solar panel temperature under normal conditions and solar panel temperature under standard test conditions; The temperature-power conversion coefficient is denoted as .

4. The cascade hydro-solar-storage complementary planning and scheduling method according to claim 1, characterized in that, For the unit time period, based on the external power transmission channel capacity threshold, peak photovoltaic output, and pumped storage power station installed capacity, the curtailed photovoltaic power of the cascade hydro-photovoltaic-storage complementary system is calculated, and based on the photovoltaic resource power and the curtailed photovoltaic power, the effective photovoltaic resource power is calculated, including: For the unit time period, the amount of curtailed solar power is calculated based on the peak photovoltaic output of the cascade hydro-solar-storage complementary system, the installed capacity of the pumped storage power station, the capacity threshold of the external power transmission channel, the duration of photovoltaic power generation, and the correction coefficient. ； In the formula, The amount of light discarded; T The duration of photovoltaic power generation; P The peak value of the photovoltaic output; The threshold value for the external power transmission channel capacity; The correction coefficient is mentioned above; The effective photovoltaic power is obtained based on the difference between the photovoltaic power generated and the curtailed power. ； In the formula, The effective photovoltaic power generation, The amount of electricity generated by the photovoltaic resources. The amount of light energy wasted is [the amount of light energy discarded].

5. The cascade hydro-solar-storage complementary planning and scheduling method according to claim 1, characterized in that, The step of calculating the total regulating power of the cascade hydro-solar-storage complementary system in any given unit time period based on the total guaranteed power and the total hydro-solar power resources in any given unit time period includes: The total hydropower and photovoltaic power generated per unit time period is obtained by summing the hydropower and photovoltaic power generated per unit time period. ； In the formula, The total power of the water-solar resources; The amount of hydropower resources per unit time period; The effective photovoltaic resource power; The total regulating power of the cascade hydro-solar-storage complementary system in the unit time period is obtained based on the difference between the total guaranteed power of the cascade hydro-solar-storage complementary system in the unit time period and the total hydro-solar resource power in the unit time period. ； In the formula, The total regulating power; The total guaranteed power capacity; The total power generation of the water-solar resources is denoted as .

6. The cascade hydro-solar-storage complementary planning and scheduling method according to claim 1, characterized in that, The determination of the regulation power to be undertaken by each reservoir based on the total regulation power and the preset quota coefficient corresponding to each reservoir in the cascade hydro-solar-storage complementary system includes: The regulating power of each reservoir is obtained by multiplying the total regulating power by the preset quota coefficient corresponding to each reservoir in the cascade hydro-solar-storage complementary system. ； In the formula, For any one of the cascade hydro-solar-storage complementary systems i The regulating power of each reservoir; For any number i The preset quota coefficient for each reservoir; This refers to the total regulating power.

7. The cascade hydro-solar-storage complementary planning and scheduling method according to claim 1, characterized in that, Before determining the required water level change for each reservoir based on the analysis formulas for regulating power and potential energy, the following steps are also included: Based on the reservoir capacity-water level relationship data of each reservoir, a quadratic curve is fitted to obtain the quadratic function relationship; ； In the formula, W For any reservoir capacity; f () is a quadratic function; h The effective head for power generation; a, b, and c are all fitting parameters; Based on the quadratic function relationship, a cubic polynomial analytical expression with effective power generation head as the independent variable and power generation potential energy as the dependent variable is obtained through integration. ； In the formula, Ω() is the power generation potential energy function; η For the efficiency of hydroelectric generator units; The specific gravity of water; Based on the analytical expression of the cubic polynomial, the potential energy analysis formula is obtained; wherein, the potential energy analysis formula is a functional relationship between the power generation generated by the inflow at any time period and the difference between the power generation potential energy value corresponding to the water level at the end of the unit time period and the power generation potential energy value corresponding to the water level at the beginning. ； In the formula, E The power generation of any reservoir within the specified unit time period; To maintain a constant reservoir water level Under the condition of inbound flow The amount of electricity generated The change in reservoir water level at the end of the unit time period compared to the beginning of the unit time period.

8. The cascade hydro-solar-storage complementary planning and scheduling method according to claim 1, characterized in that, Also includes: Update the water levels of each reservoir based on the aforementioned water level changes; When the updated water level is determined to be between the normal water storage level and the dead water level of the reservoir, the scheduling for the current unit time period is completed. When it is determined that the updated water level is not between the normal water storage level and the dead water level of the reservoir, the preset quota coefficients corresponding to each reservoir are adjusted and recalculated until the updated water level is between the normal water storage level and the dead water level of the reservoir.

9. The cascade hydro-solar-storage complementary planning and scheduling method according to claim 1, characterized in that, Also includes: After the entire scheduling cycle ends, the water level change curves of each reservoir, the target power curve of the cascade hydro-solar-storage complementary system, and the curtailment rate of solar power are generated and output.

10. A cascade hydro-solar-storage complementary planning and scheduling system, characterized in that, include: The first processing module is used to calculate the hydropower resources of the reservoirs in the cascade hydro-solar-storage complementary system based on the hydrological data of the reservoirs in the system within a unit time period during the scheduling cycle; calculate the photovoltaic resources of the system based on the photovoltaic resource data within the system within a unit time period; calculate the curtailed photovoltaic power of the system based on the external power transmission channel capacity threshold, peak photovoltaic output, and pumped storage power station installed capacity within a unit time period, and calculate the effective photovoltaic resources based on the photovoltaic resources and the curtailed photovoltaic power; calculate the average hydropower resources and the average effective photovoltaic resources within a unit time period based on the hydropower resources and the effective photovoltaic resources of the reservoirs in the cascade hydro-solar-storage complementary system within each unit time period during the scheduling cycle; and sum the average hydropower resources and the average effective photovoltaic resources within a unit time period to obtain the total guaranteed power within a unit time period during the scheduling cycle. ； In the formula, The total guaranteed power capacity; For the first j Hydropower resources and electricity volume per unit time period; For the first j The effective photovoltaic power generation per unit time period; N The number of time slots contained in a scheduling cycle; The first processing module is also used to take the total guaranteed power of the cascade hydro-solar-storage complementary system in a unit time period within the scheduling cycle as the target power that the cascade hydro-solar-storage complementary system transmits to the grid in each unit time period. The second processing module is used to calculate the total regulating power of the cascade hydro-solar-storage complementary system in any given unit time period based on the total guaranteed power and the total hydro-solar resource power in any given unit time period. The third processing module is used to determine the amount of regulation power that each reservoir needs to undertake based on the total regulation power and the preset quota coefficient corresponding to each reservoir in the cascade hydro-solar-storage complementary system. The fourth processing module is used to determine the required water level change for each reservoir based on the regulation power and potential energy analysis formulas for each reservoir.

11. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the cascade hydro-solar-storage complementary planning and scheduling method as described in any one of claims 1 to 9.

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