Cascade water-light-storage complementary planning and scheduling method and system

Abstract

The invention provides a cascade water-light-storage complementary planning scheduling method and system, and belongs to the field of power system operation control, and the method comprises the steps: calculating the target electric quantity transmitted to a power grid by a cascade water-light-storage complementary system in each unit time period according to the total guarantee electric quantity of the cascade water-light-storage complementary system in the unit time period in a scheduling period; according to the total guarantee electric quantity and the total water-light resource electric quantity in any unit time period, calculating the total adjustment electric quantity of the cascade water-light-storage complementary system in any unit time period; according to the total adjustment electric quantity and a preset quota coefficient corresponding to each reservoir in the cascade water-light-storage complementary system, the adjustment electric quantity of each reservoir is determined; and determining the water level variation of each reservoir according to the adjustment electric quantity and potential energy analysis formula of each reservoir. According to the invention, by establishing the distribution scheduling model based on the reservoir power generation potential energy analytical expression, the reservoir optimization scheduling is converted from a traditional high-dimensional nonlinear programming problem to an algebraic solution problem, so that the efficiency and stability of calculating the water level variation of the reservoir are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system operation control, and particularly relates to a cascade water-light-storage complementary planning and scheduling method and system. BACKGROUND

[0002] With the deepening of energy structure transformation, the cascade water-light-storage complementary system, which is combined with cascade hydropower stations and large-scale photovoltaic power stations and pumped storage power stations, plays an increasingly important role in the new power system. However, the randomness and volatility of photovoltaic output bring significant challenges to the safe and stable operation of the power grid. In order to smooth such fluctuations, the regulating capacity of conventional hydropower stations and pumped storage power stations is usually used to compensate and optimize the unstable photovoltaic output.

[0003] The key to realizing efficient operation of water-light complementary is the optimal scheduling of the cascade water-light-storage complementary system. In the prior art, the scheduling of the reservoir is usually based on a mathematical model of water balance and energy calculation. However, when the model is applied to a cascade system containing multiple reservoirs and a long scheduling period, the variables and constraint conditions of the model will grow exponentially. At the same time, due to the mutual coupling of the hydraulic and electric connections between upstream and downstream reservoirs, there is a complex nonlinear relationship between power generation and water level and flow, which results in the need to rely on complex optimization algorithms and undergo long iterative calculations to solve such models. The above factors result in poor efficiency and stability in solving the water level change amount of each reservoir in the scheduling model. SUMMARY

[0004] The present application provides a cascade water-light-storage complementary planning and scheduling method and system to solve the defects in the prior art and improve the efficiency and stability in solving the water level change amount of each reservoir in the cascade water-light-storage complementary system planning and scheduling optimization calculation.

[0005] The present application provides a cascade water-light-storage complementary planning and scheduling method, comprising the following steps: According to the total guaranteed power of the cascade water-light-storage complementary system in each unit time period within the scheduling period, the target power of the cascade water-light-storage complementary system delivered to the power grid in each unit time period is calculated; According to the total guaranteed power and the total resource power of water and light in any unit time period, the total regulating power of the cascade water-light-storage complementary system in any unit time period is calculated; According to the total regulating power and the preset quota coefficient corresponding to each reservoir in the cascade water-light-storage complementary system, the regulating power that each reservoir needs to bear is determined; According to the regulating power of each reservoir and the potential energy analysis formula, the water level change amount required by each reservoir is determined.

[0006] 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: 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. 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.

[0007] 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: 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.

[0008] 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: 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 .

[0009] 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: 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].

[0010] 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: 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 power generation; 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. ; In the formula, The total regulating power; The total guaranteed power capacity; The total power generation of the water-solar resources is denoted as .

[0011] 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: The allocated power to be borne by each reservoir is obtained by multiplying the total regulating power and the preset quota coefficient corresponding to each reservoir in the cascade hydro-solar-storage complementary system. The regulating power of each reservoir is obtained by comparing the allocated power of each reservoir with the corresponding total hydropower and solar power resources. ; 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; The total regulating power; For any number i The total hydropower resources of the reservoir.

[0012] The step of determining the water level change amount of each reservoir according to the regulating power and potential energy analysis formula of each reservoir further comprises the following steps before the water level change amount of each reservoir is determined according to the regulating power and potential energy analysis formula of each reservoir: fitting a quadratic curve according to reservoir storage-capacity-water level relationship data of each reservoir to obtain a quadratic function relationship formula; In the formula, C is the reservoir storage capacity of any reservoir; W is the quadratic function; f is the effective power generation water head; a, b and c are all fitting parameters; h obtaining a cubic polynomial analytical expression with the effective power generation water head as the independent variable and the power generation potential energy as the dependent variable through integral operation according to the quadratic function relationship formula; In the formula, Ω() is the power generation potential energy function; η is the water turbine efficiency; is the specific weight of water; obtaining the potential energy analysis formula according to the cubic polynomial analytical expression; wherein the potential energy analysis formula is a function relationship formula of the power generation amount generated by the inflow in 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 initial water level; In the formula, Q is the power generation amount of any reservoir in the unit time period; E is the power generation amount generated by the inflow under the condition of constant reservoir water level is the water level change amount of the reservoir water level at the end of the unit time period compared with the water level at the beginning of the unit time period.

[0013] The step of determining the water level change amount of each reservoir according to the regulating power and potential energy analysis formula of each reservoir further comprises the following steps before the water level change amount of each reservoir is determined according to the regulating power and potential energy analysis formula of each reservoir: updating the water level of each reservoir according to the water level change amount; when it is determined that the updated water level is between the normal reservoir water level and the dead water level, completing the scheduling of the current unit time period; when it is determined that the updated water level is not between the normal reservoir water level and the dead water level, adjusting the preset quota coefficient corresponding to each reservoir to recalculate until the updated water level is between the normal reservoir water level and the dead water level.

[0014] The step of determining the water level change amount of each reservoir according to the regulating power and potential energy analysis formula of each reservoir further comprises the following steps before the water level change amount of each reservoir is determined according to the regulating power and potential energy analysis formula of each reservoir: ​​​​​​​When the whole scheduling period ends, the water level change curve of each reservoir, the target power curve of the cascade water-light storage complementary system and the light abandonment rate are generated and output.

[0015] The application further provides a cascade water-light storage complementary planning scheduling system, comprising the following modules. The first processing module is configured to calculate the target power delivered by the cascade water-light storage complementary system to the power grid in each unit time period according to the total guaranteed power of the cascade water-light storage complementary system in the unit time period. The second processing module is configured to calculate the total regulation power of the cascade water-light storage complementary system in any unit time period according to the total resource power of water and light in the unit time period and the total guaranteed power. The third processing module is configured to determine the regulation power to be borne by each reservoir according to the total regulation power and the preset quota coefficient corresponding to each reservoir in the cascade water-light storage complementary system. The fourth processing module is configured to determine the water level change required by each reservoir according to the regulation power of each reservoir and a potential energy analysis formula.

[0016] The application further provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the cascade water-light storage complementary planning scheduling method as described above when executing the program.

[0017] The application further provides a non-transitory computer readable storage medium, which stores a computer program, wherein the computer program is executed by a processor to implement the cascade water-light storage complementary planning scheduling method as described above.

[0018] The application further provides a computer program product, comprising a computer program, wherein the computer program is executed by a processor to implement the cascade water-light storage complementary planning scheduling method as described above.

[0019] To sum up, the one or more technical solutions provided in the embodiments of the application have at least the following technical effects or advantages: According to the total guaranteed power of the cascade water-light storage complementary system in a unit time period in a scheduling period, the target power of the cascade water-light storage complementary system delivered to the power grid in each unit time period is calculated, so that the highly fluctuating and random photovoltaic power output is converted into stable power output through the regulation of conventional hydropower and pumped storage power stations, and the cascade water-light clean energy guaranteed power with high guarantee rate is provided for the power grid. According to the total guaranteed power and the total resource power of water and light in any unit time period, the total regulation power of the cascade water-light storage complementary system in any unit time period is calculated, so that the power absorbed or compensated by the cascade reservoir group in each unit time period is accurately quantified. According to the total regulation power and the preset quota coefficient corresponding to each reservoir in the cascade water-light storage complementary system, the regulation power borne by each reservoir is determined. According to the regulation power of each reservoir and the potential energy analysis formula, the water level change required by each reservoir is determined, so that the traditional cascade reservoir joint scheduling model is converted into an analytical method for solving, avoiding the dimension disaster problem of high-dimensional nonlinear calculation in the traditional method, and significantly improving the calculation efficiency and stability. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is one of the flowcharts of the cascade water-light storage complementary planning and scheduling method provided by the present application.

[0022] Figure 2 is the second flowchart of the cascade water-light storage complementary planning and scheduling method provided by the present application.

[0023] Figure 3 is a typical daily photovoltaic output distribution curve provided by the present application.

[0024] Figure 4 is a light rejection power diagram provided by the present application.

[0025] Figure 5 is a triangular simplification method diagram for calculating the light rejection power without considering the condition of pumped storage power station provided by the present application.

[0026] Figure 6 is a light rejection power calculation diagram considering the condition of pumped storage power station provided by the present application.

[0027] Figure 7 is a structure diagram of the cascade water-light storage complementary planning and scheduling system provided by the present application.

[0028] Figure 8 is a structural schematic diagram of an electronic device provided by the present application. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. According to the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] It should be noted that in the description of the present application, the terms “comprise”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement “comprising a…” does not exclude the presence of other identical elements in the process, method, article or device comprising the element. The terms “up”, “down” and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the system or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] The terms “first”, “second” and the like in the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by “first”, “second” and the like are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, “and / or” means at least one of the connected objects, and the character “ / ” generally represents a “or” relationship between the front and rear associated objects.

[0032] The embodiments of the present application will be described below in conjunction with Figures 1 to 8 The step-by-step water-light storage complementary planning and dispatching method, system, electronic device, storage medium and computer program product provided by the present application are described.

[0033] Reference Figure 1 , Figure 1is one of flowcharts of the cascade water-light storage complementary planning and scheduling method provided by the present application, as shown in Figure 1 , comprising steps 101 to 104: Step 101: According to the total guaranteed power of the cascade water-light storage complementary system in a unit period within a scheduling period, the target power of the cascade water-light storage complementary system delivered to the power grid in each unit period is calculated.

[0034] In this embodiment, one scheduling period can be one week, and one unit period can be one day. The total guaranteed power of all reservoirs in each unit period within the scheduling period refers to the total resource power generated by the jointly operated reservoir group and its supporting photovoltaic power station within one day. Based on the total guaranteed power, subsequent calculations can be performed.

[0035] Specifically, according to the total guaranteed power of all reservoirs and photovoltaic power stations of the cascade water-light storage system in each unit period within the scheduling period, the target power that the cascade water-light storage system needs to constantly deliver to the power grid in each unit period is calculated. The target power is a constant value that remains unchanged throughout the scheduling period, serving as the promised power of the cascade water-light storage system to the power grid. The calculation process aims to average the fluctuating total resource power of water and light in multiple unit periods to a constant output value with high guarantee rate.

[0036] In one possible implementation, referring to Figure 2 , Figure 2 is another flowchart of the cascade water-light storage complementary planning and scheduling method provided by the present application, and before step 101, the method further comprises the following steps: Step 201: For a unit period, according to the hydrological data of the reservoirs in the cascade water-light storage complementary system, the hydropower resource power of the reservoirs in the cascade water-light storage complementary system is calculated.

[0037] Step 202: For a unit period, according to the data of the photovoltaic resources in the cascade water-light storage complementary system, the photovoltaic resource power of the cascade water-light storage complementary system is calculated.

[0038] Step 203: For a unit period, according to the external power transmission channel capacity threshold, the peak output of the photovoltaic power station and the installed capacity of the pumped storage power station, the abandoned light power of the cascade water-light storage complementary system is calculated, and according to the photovoltaic resource power and the abandoned light power, the effective photovoltaic resource power is calculated.

[0039] Step 204: For a scheduling period, according to the hydropower resource power and the effective photovoltaic resource power of the reservoirs in the cascade water-light storage complementary system in each unit period, the average value of the hydropower resource power and the average value of the effective photovoltaic resource power in the unit period are calculated, respectively.

[0040] Step 205: Summing the average water and electricity resource power of the unit time period and the average effective photovoltaic resource power of the unit time period to obtain the total guaranteed power of the unit time period in the scheduling period.

[0041] Specifically, for any unit time period, first, the water and electricity resource power of all reservoirs is calculated according to the hydrological data of all reservoirs. In the embodiment, the hydrological data of all reservoirs mainly refers to the inflow data of each reservoir.

[0042] In a specific implementation, step 201 specifically includes the following steps: calculating the water and electricity resource power according to the water and electricity unit efficiency, the specific gravity of water, the inflow and the effective power generation head of all reservoirs; Specifically, the hydrological data specifically includes the unit efficiency , the specific gravity of water , the inflow and the effective power generation head . Among them, the unit efficiency is the efficiency coefficient of the water turbine generator set converting water energy into electric energy; the specific gravity of water is a physical constant; the inflow 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.

[0043] The water and electricity resource power is calculated according to the unit efficiency, the specific gravity of water, the inflow and the effective power generation head of all reservoirs. Specifically, the calculation formula of the water and electricity resource power is as follows:

[0044] In the formula, is the water and electricity resource power of the unit time period; η is the water and electricity unit efficiency; is the specific gravity of water; is the average inflow of the unit time period; h is the effective power generation head. Through the formula, the inflow water energy resource of the reservoir can be converted into the corresponding power generation of the hydropower station.

[0045] Further, step 202 is performed, and for the unit time period, the photovoltaic resource power in the cascade water-light-storage complementary system is calculated according to the data of the photovoltaic resource in the cascade water-light-storage complementary system.

[0046] In a specific implementation, step 202 specifically includes the following steps: calculating the photovoltaic resource power according to the installed capacity of the photovoltaic power station in the cascade water-light-storage complementary system, the solar radiation intensity under the standard test condition, the solar radiation intensity of each photovoltaic power generation time period, the solar cell panel temperature of each photovoltaic power generation time period, the solar cell panel temperature under the standard test condition and the air temperature power conversion coefficient.

[0047] 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:

[0048] 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 period. 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 period. t Solar panel temperature under normal conditions and solar panel temperature under standard test conditions; This is the temperature-power conversion coefficient.

[0049] 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.

[0050] In one specific implementation, step 203 specifically includes the following steps: 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 coefficient. The effective photovoltaic power is obtained by calculating the difference between the photovoltaic power generated and the curtailed power.

[0051] Specifically, the preset amount of abandoned solar power is determined in the following way.

[0052] 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 is the abandoned light power diagram provided by the present application. Further according to Figure 4 triangular simplification analysis can be obtained under the condition of triangular simplification abandoned light power calculation diagram, refer to Figure 5 , Figure 5 is the triangular simplification method provided by the present application under the condition of pumped storage power station, which does not consider the abandoned light power calculation. As shown in Figure 5 , the total area of the whole triangle is: , further can be derived: , , , wherein, is the peak value of photovoltaic daily output, is the transmission channel capacity threshold, L is the abandoned light time length in a unit period. According to Figure 5 , further to carry out the analysis of abandoned light under the condition of pumped storage power station, get the abandoned light power calculation diagram considering the condition of pumped storage power station, refer to Figure 6 , Figure 6 is the abandoned light power calculation diagram provided by the present application considering the condition of pumped storage power station. Figure 6 the upper base of the isosceles trapezoidal shadow part can be obtained by the following formula: ; is the total period of dispatching, that is, the lower base of the isosceles trapezoidal shadow part; y is half of the difference between the lower base and the upper base of the isosceles trapezoidal shadow part; is the installed capacity of pumped storage power station, that is, the height of the isosceles trapezoidal shadow part. The abandoned light power is calculated by the following formula:

[0053] wherein according to Figure 6 shown, thus can be obtained:

[0054] in the formula, is the abandoned light power; T is the photovoltaic power generation time; P is the peak value of photovoltaic output; is the installed capacity of pumped storage power station; is the external transmission channel capacity threshold; is the correction coefficient.

[0055] the net photovoltaic power generation after the photovoltaic resource power is reduced by the abandoned light power, represents the actual effective photovoltaic resource power which can be connected to the grid. The specific calculation formula of effective photovoltaic resource power is as follows:

[0056] wherein, is the effective photovoltaic resource electricity, is the photovoltaic resource electricity, is the abandoned light electricity.

[0057] Further, step 204 is performed to calculate, for each unit time period within the dispatching period, the water and electricity resource electricity average value and the effective photovoltaic resource electricity average value, respectively, based on the water and electricity resource electricity and the effective photovoltaic resource electricity of the cascade water-light storage complementary system in each unit time period.

[0058] Specifically, the water and electricity resource electricity average value can be expressed by the following formula: wherein, is the water and electricity resource electricity of the i-th unit time period; j is the number of unit time periods included in a dispatching period. N The effective photovoltaic resource electricity average value can be expressed by the following formula:

[0059] wherein, is the water and electricity resource electricity of the i-th unit time period; is the number of unit time periods included in a dispatching period. j N Further, step 205 is performed to sum the water and electricity resource electricity average value of each unit time period and the effective photovoltaic resource electricity average value of each unit time period to obtain the total guaranteed electricity of each unit time period within the dispatching period.

[0060] The total guaranteed electricity is specifically calculated by the following formula:

[0061]

[0062] wherein, is the total guaranteed electricity.

[0063] Step 102: calculating the total regulation electricity of the cascade water-light storage complementary system in any unit time period based on the total guaranteed electricity and the total water and light resource electricity of the unit time period.

[0064] Since the water and electricity resource electricity and the photovoltaic resource electricity fluctuate daily within the dispatching period, and the target electricity delivered to the power grid is constant, there will be a difference between the actual power generation capacity and the target electricity delivered daily. In order to effectively regulate and manage this difference, it is necessary to first accurately quantify it. The implementation of this step aims to calculate the electricity that needs to be absorbed or compensated by the cascade reservoir group daily, providing a clear quantitative index for subsequent allocation of regulation tasks to individual reservoirs.

[0065] In a specific embodiment, step 102 specifically includes the following steps:​​ First, the water and light total resource power of the unit time period is obtained by summing the water and electricity resource power and the effective photovoltaic resource power of the unit time period;

[0066] In the formula, is the water and light total resource power; is the water and electricity resource power of the unit time period; is the effective photovoltaic resource power.

[0067] Next, the total adjustment power of the cascade water and light storage complementary system in the unit time period is obtained according to the difference between the total guaranteed power of the cascade water and light storage complementary system in the unit time period and the water and light total resource power of the unit time period in the dispatching period;

[0068] In the formula, is the total adjustment power; is the total guaranteed power; is the water and light total resource power.

[0069] In the embodiment, the calculation process is performed in any unit time period (for example, one day).

[0070] The positive and negative values of the total adjustment power calculated have clear physical meanings. When the total guaranteed power is less than the target power, the total adjustment power calculated is positive, indicating that there is a power gap in the current period, and the reservoir needs to increase the power generation by reducing the water level to make up the difference. Conversely, when the total guaranteed power is greater than the target power, the total adjustment power calculated is negative, indicating that there is a power surplus in the current period, and the reservoir needs to store this excess energy by raising the water level to reduce the power generation for subsequent periods. This calculation is performed for each unit time period in the dispatching period.

[0071] Step 103: According to the total adjustment power and the preset quota coefficient corresponding to each reservoir in the cascade water and light storage complementary system, the adjustment power that each reservoir needs to bear is determined.

[0072] After calculating the total adjustment power of all reservoirs, the overall adjustment task needs to be decomposed and implemented to each reservoir. This step aims to provide a clear and simple allocation method to convert the overall adjustment demand into an independent and executable adjustment target for each reservoir, thereby decoupling and simplifying the complex cascade reservoir joint dispatching problem.

[0073] In a specific implementation, step 103 specifically includes the following steps: First, the allocation power that each reservoir needs to bear is obtained according to the product of the total adjustment power and the preset quota coefficient corresponding to each reservoir in the cascade water and light storage complementary system.

[0074] 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.

[0075] 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. For example, for the first... i The reservoir is responsible for distributing the following electricity: .

[0076] Next, the regulating power of each reservoir is obtained based on the difference between the allocated power of each reservoir and the corresponding total hydropower resources.

[0077] 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; Total regulating power; For any number i The total hydropower resources of the reservoir.

[0078] 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.

[0079] 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: Based on the reservoir capacity-water level relationship data of each reservoir, a quadratic curve is fitted to obtain the quadratic function relationship; 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. 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.

[0080] Specifically, to establish the analytical expression relationship between the regulating power and the reservoir water level change, thereby replacing the traditional cascade reservoir optimization scheduling of tedious period-by-period difference calculation, it is necessary to first theoretically derive the power potential energy formula with water level as the only independent variable.

[0081] First, the reservoir storage-capacity-water level relationship data is obtained. This data is the basic information representing the physical form of the reservoir, usually a series of discrete data points. To facilitate subsequent continuous function operations, the storage-capacity-water level relationship data is then fitted with a quadratic curve to obtain a quadratic function relationship between storage capacity and water level. This step approximates the discrete storage-capacity-water level relationship (V-h) to a continuous quadratic function relationship, which is specifically expressed as follows:

[0082] In the formula, W is the storage capacity of any reservoir; f is a quadratic function; h is the effective power generation water head; a, b, and c are all fitting parameters; and this quadratic function relationship provides a premise for subsequent integral calculation.

[0083] After obtaining the quadratic function relationship representing the storage-capacity-water level relationship, based on the principle of hydroelectric power generation, the power generation energy is expressed as a function of the water turbine efficiency, the specific weight of water, the volume, and the water level. Hydroelectric power generation is essentially the conversion of the gravitational potential energy of water into mechanical energy of the water turbine and generator, and further into electrical energy. The total potential energy accumulated in the reservoir can be obtained by integrating the storage-capacity-water level relationship function. Accordingly, the integral operation of the function is performed to obtain a cubic polynomial analytical expression with the effective power generation water head as the independent variable and the power generation potential energy as the dependent variable. Since the storage capacity is approximated as a quadratic function of the effective power generation water head, after performing the integral operation, a higher-order function about the effective power generation water head is naturally obtained, i.e., a cubic polynomial analytical expression: , which is the power generation potential energy function of the reservoir, directly establishes an explicit mathematical expression between the power generation potential of the reservoir and the reservoir water level. In the formula, Ω() is the power generation potential energy function; η is the water turbine efficiency; is the specific weight of water.

[0084] Finally, according to the cubic polynomial analytical expression, the potential energy analysis formula is obtained. The potential energy analysis formula is a function relationship between the water power resource power of any period and the difference between the power generation potential energy value corresponding to the water level at the end of the period and the power generation potential energy value corresponding to the initial water level, under the condition that the initial water level is constant. The water power resource power is the power generation capacity generated by the inflow flow.

[0085] The potential energy analysis formula is specifically expressed as: ; in the formula, Ethe power generation of any reservoir in a unit time period; the power generation of any reservoir in a unit time period; the power generation of any reservoir in a unit time period; the power generation of any reservoir in a unit time period; the power generation of any reservoir in a unit time period;

[0086] the power generation of any reservoir in a unit time period; the power generation of any reservoir in a unit time period; the power generation of any reservoir in a unit time period; the power generation of any reservoir in a unit time period;

[0087] After obtaining the potential energy analysis formula, a method is needed to establish a direct relationship between the regulating power and the physical state of the reservoir in order to convert the allocated regulating power into specific executable reservoir dispatching instructions. The implementation of this step aims to solve the "dimension disaster" problem caused by the complicated calculation process in traditional dispatching methods and quickly and accurately determine the water level adjustment amount required to complete the regulation task.

[0088] In this embodiment, the specific implementation is to obtain the water level change amount required by each reservoir to complete the regulating power according to the regulating power and the potential energy analysis formula of each reservoir.

[0089] The potential energy analysis formula is used to characterize the reservoir power generation potential as an analytical solution of the reservoir water level. This formula directly establishes a functional relationship between the power generation potential (or regulating power) in a unit time period and the water level at the beginning and end of the period.

[0090] According to the foregoing embodiment, the potential energy analysis formula for the first i reservoir can be expressed as: ; wherein the power generation potential function is a polynomial with respect to the water level; the power generation of any reservoir in a unit time period is known, i.e., the regulating power ; the initial water level of the current period is also known. Substituting these known quantities into the above potential energy analysis formula, an algebraic equation with the water level change amount as the only unknown is obtained. Since the power generation potential function is a cubic polynomial, the equation is a cubic equation with one variable. By solving the real solution of the equation, the water level change amount required to complete the regulating power can be directly calculated. This method converts the complex differential calculation involving multiple variables such as flow, head, and time in traditional optimal scheduling into a simple process of solving a cubic equation, fundamentally simplifying the model and greatly improving the calculation efficiency and stability.

[0091] In one possible implementation, after step 104, the method further includes the following steps: updating the water level of each reservoir according to the water level change amount; when it is determined that the updated water level is between the normal water level and the dead water level of the reservoir, completing the scheduling of the current unit period; when it is determined that the updated water level is not between the normal water level and the dead water level of the reservoir, adjusting the preset quota coefficient corresponding to each reservoir to recalculate until the updated water level is between the normal water level and the dead water level of the reservoir.

[0092] After the water level change amount required by each reservoir to complete the allocated power is calculated, the calculation result needs to be technically feasible to ensure that the scheduling scheme will not cause the water level of the reservoir to exceed its safe operating range.

[0093] Specifically, first, the water level of each reservoir is updated according to the water level change amount. Specifically, the initial water level of the current unit period is added to the water level change amount 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 period after performing the allocated adjustment task.

[0094] After obtaining the updated water level, it needs to be judged according to the constraint condition. When it is determined that the updated water level is between the normal water level and the dead water level, the daily scheduling is completed. The normal water level is the highest water level that the reservoir is allowed to store under normal operating conditions, and the dead water level is the lowest water level that the reservoir is allowed to fall, which together constitute the water level constraint interval of the reservoir operation. If the updated water level calculated is within this interval, it indicates that the allocation of the adjustment task is feasible, and the daily scheduling calculation of the reservoir is completed.

[0095] However, in some cases, the calculation result can exceed the water level constraint condition. When it is determined that the updated water level is not between the normal storage level and the dead storage level, the preset allocation coefficient of each reservoir is adjusted to recalculate the allocated power and the corresponding water level change, until the updated water level is between the normal storage level and the dead storage 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 storage level, the initial adjustment task allocation scheme is not feasible for the reservoir. At this time, a feedback adjustment mechanism needs to be started. This mechanism is realized by adjusting the preset allocation coefficient of each reservoir, for example, appropriately reducing the allocation coefficient of the reservoir that causes the water level to exceed the limit, and correspondingly increasing the allocation coefficient of other reservoirs that have adjustment margin. After adjusting the allocation coefficient, return to step 103 to redistribute the total adjustment power of the day with the new coefficient, and recalculate the allocated power of each reservoir and the corresponding water level change, and then repeat the water level constraint condition check. This iteration process will continue until a reasonable set of allocation coefficients is found, so that the updated water level of all reservoirs can meet their respective normal storage level and dead storage level constraints.

[0096] In one possible implementation, after step 104, the following steps are further included: When the entire dispatching period ends, the water level change curve of each reservoir, the target power curve of the cascade water-light storage complementary system, and the light rejection rate are generated and output.

[0097] To intuitively evaluate the calculation results of the entire dispatching period and provide clear information to the operating personnel, a large amount of data generated during the dispatching process needs to be sorted and visually presented. The implementation of this step aims to summarize the calculation results of each unit period and finally output them in the form of graphs and data.

[0098] Among them, the water level change curve of each reservoir displays the daily water level elevation of each reservoir in the entire dispatching period in a graphical way. For example, by calling a drawing function, the updated water level sequence after each day of dispatching is drawn in the form of a line graph, with the horizontal coordinate representing the dispatching date and the vertical coordinate representing the reservoir water level. This curve can intuitively reflect the water level change scheduling process of each reservoir to smooth the fluctuation of photovoltaic power generation output.

[0099] The target power curve displays the daily target power value delivered to the power grid constantly in a dispatching period. This curve usually appears as a horizontal straight line throughout the dispatching period, and its value is equal to the guaranteed power calculated above. When outputting, this straight line can be compared with the columnar Figure 1 chart representing the actual combination of water and light output of each day, so that the actual total resource power of water and light of each day can be clearly compared with the constant target power delivered.

[0100] The abandoned light rate is a key quantitative index, and its value is the percentage of abandoned light power to photovoltaic resource power. The value can be output as an average value of the entire scheduling period, or the daily abandoned light rate can be output to evaluate the consumption of photovoltaic resources.

[0101] The generation and output process is realized by calling corresponding software libraries. For example, the graphic file of the above-mentioned curve is generated by calling a drawing library, and detailed data including daily abandoned light power, total water-light resource power and water level sequence are stored in an Excel file by calling a report output library, so as to facilitate subsequent archiving and analysis.

[0102] Further, in order to specifically illustrate the embodiments of the present application, In the present embodiment, data input is first performed. A scheduling period of 7 days is set. For the scheduling period, daily runoff data of a certain cascade reservoir is input, specifically daily average inflow of 704, 811, 796, 704, 627, 572 and 545 m 3 / s. At the same time, daily photovoltaic power resource power is input, specifically 59.19×10 6 , 56.36×10 6 , 29.97×10 6 , 54.51×10 6 , 52.55×10 6 , 63.21×10 6 , 48.03×10 6 kWh. In addition, the capacity threshold of the power transmission channel is set to 7.0 MW, and the basic characteristic parameters of the two hydropower stations A and B of a certain cascade reservoir, such as reservoir capacity-water level relationship parameters, dam top elevation, normal storage level, dead storage level, downstream water level and regulation water level, are input.

[0103] After inputting the data, the abandoned light analysis of photovoltaic power generation and grid connection is performed. According to the input daily photovoltaic power resource power and the capacity threshold of the power transmission channel, the daily effective photovoltaic power and the abandoned light power are calculated. The calculation results show that the daily effective photovoltaic power in the present scheduling period is 53.70×10 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. The process also obtains the abandoned light power, wherein the maximum daily abandoned light power is 7.83×10 6 kWh, and the corresponding abandoned light rate is about 12.4%.

[0104] Then, the guaranteed power is calculated. The daily water and light resource power and the effective photovoltaic resource power in a 7-day scheduling period are added to obtain the daily water and light total resource power, and the water and light total resource power in the 7 days is taken as an arithmetic average. The average guaranteed power of the period is calculated to be 85.05 x 10 6 kWh, which is used as the target power to be constantly delivered to the power grid every day in the scheduling period.

[0105] Subsequently, the daily adjustment power distribution is performed. For each day in the scheduling period, the total adjustment power to be borne by the cascade reservoirs is calculated by comparing the daily water and light total resource power with the determined guaranteed power. Then, the total adjustment power is evenly distributed to the hydropower station A and the hydropower station B according to the preset quota coefficient (0.5, 0.5), so as to obtain the adjustment power to be borne by each hydropower station.

[0106] After the adjustment power of each hydropower station is determined, the water level change of each hydropower station is calculated and corrected. It is assumed that the initial water level of the hydropower station A and the hydropower station B at the beginning of a weekly adjustment period is 2884.33 m (elevation) and 2696.37 m (elevation) respectively, and the corresponding effective generating water head is 144.33 m and 134.97 m respectively. According to the adjustment power allocated to the hydropower station A and the hydropower station B respectively, the water level change required to complete the power adjustment is calculated by using the potential energy analysis formula. The calculation result shows that the water level amplitude of the hydropower station A and the hydropower station B is about 2 m and 1 m respectively in a weekly adjustment period. At the same time, the water level after daily adjustment is checked, and the result shows that the water level of the two reservoirs is within the constraint range of the normal storage level and the dead storage level. In addition, after the end of a weekly adjustment period, the water level of the hydropower station A returns to the initial water level (i.e. 2884.33 m (elevation)), and the water level of the hydropower station B returns to the initial water level (i.e. 2696.37 m (elevation)).

[0107] Finally, the output and analysis of the result are performed. After the calculation of the entire scheduling period is completed, the visual result chart is automatically generated and output. The chart includes a comparison chart of daily water and light complementary output and guaranteed power in the form of a histogram, and a daily water level change curve of the hydropower station A and the hydropower station B in the form of a line chart in the scheduling period. At the same time, the detailed data including daily abandoned light power, water and light total resource power and water level sequence are output to a spreadsheet file.

[0108] The result of the embodiment shows that, compared with the nonlinear iterative calculation of the traditional cascade reservoir optimization scheduling model, the calculation amount of the method is significantly reduced, and the calculation result is intuitive and stable, which is suitable for the planning and scheduling of large-scale cascade water and light storage complementary system.

[0109] Further, the method of the present application can be implemented by software. In the present embodiment, the software is developed based on the Python platform and adopts a modular architecture design. The design as a whole includes the functions of data input and preprocessing, photovoltaic power analysis, hydroelectric power calculation, dispatch optimization, water level change updating, and result output and visualization, and information interaction is achieved between the functions through function calls and data interfaces, thereby forming a complete dispatch optimization and result analysis process. In terms of technical implementation details, the development environment of the software can adopt Python 3.x, the implementation of numerical calculation can call the numpy library, the drawing function can call the matplotlib library, and the report output can call the openpyxl library. In terms of core class design, a Reservoir class can be designed to store the parameters and daily water level, storage capacity, and power generation potential of a single reservoir; and a CRes_Opt class can be designed to manage the dispatch of the reservoir group, which includes global variables such as dispatch period, guaranteed power, abandoned photovoltaic power, and regulation power, and encapsulates methods such as dispatch solving, drawing, and output. In terms of running process, the get_input() method is called to read the input data; the Solar_E() method is called to analyze the abandoned photovoltaic power; the step_one_period() method is called to complete single-period dispatch; the Solver() method is called to complete full-period rolling calculation; and finally the Draw() and OutputToExcel() methods are called to output the results.

[0110] Reference Figure 7 , Figure 7 is a structural schematic diagram of a cascade water-light-storage complementary planning and dispatching system provided by the present application, and the system comprises: a first processing module, configured to calculate target power delivered by the cascade water-light-storage complementary system to a power grid in each unit period according to total guaranteed power of the cascade water-light-storage complementary system in a unit period within a dispatch period; a second processing module, configured to calculate total regulation power of the cascade water-light-storage complementary system in an arbitrary unit period according to the total guaranteed power and total resource power of water and light in the arbitrary unit period; a third processing module, configured to determine regulation power to be borne by each reservoir according to the total regulation power and a preset quota coefficient corresponding to each reservoir in the cascade water-light-storage complementary system; a fourth processing module, configured to determine water level change amount required by each reservoir according to the regulation power of each reservoir and a potential analysis formula.

[0111] In a possible implementation manner, the system further comprises a fifth processing module, configured to: perform quadratic curve fitting according to reservoir capacity-water level relationship data of each reservoir to obtain a quadratic function relationship;

[0112] In the formula, W is an arbitrary reservoir capacity; h is an effective power generation water head; a, b, c are all fitting parameters; According to the quadratic function relationship, a third-order polynomial analytical expression is obtained by integral operation, taking the effective power generation water head as the independent variable and the power generation potential energy as the dependent variable;

[0113] In the formula, Ω() is a power generation potential energy function; η is a water turbine efficiency; is a water density; According to the third-order polynomial analytical expression, a potential energy analysis formula is obtained; wherein, the potential energy analysis formula is a function relationship formula of the power generation amount generated by the inflow in an arbitrary period and the difference between the power generation potential energy value corresponding to the water level at the end of the unit period and the power generation potential energy value corresponding to the initial water level;

[0114] In the formula, E is the power generation amount of the arbitrary reservoir in the unit period; is the power generation amount generated by the inflow under the condition of constant reservoir water level ; is the water level change amount of the reservoir water level at the end of the unit period compared with the initial water level of the unit period. In a possible implementation, the fourth processing module is further configured to:

[0115] update the water level of each reservoir according to the water level change amount; when determining that the updated water level is between the normal water storage level and the dead water level of the reservoir, complete the scheduling of the current unit period; when determining that the updated water level is not between the normal water storage level and the dead water level of the reservoir, adjust the preset quota coefficient corresponding to each reservoir to recalculate until the updated water level is between the normal water storage level and the dead water level of the reservoir.

[0116] In a possible implementation, the system further comprises a sixth processing module configured to: when the entire scheduling period ends, generate and output the water level change curve of each reservoir, the target power curve of the cascade water-light storage complementary system and the light abandonment rate.

[0117] It should be noted that the cascade water-light storage complementary planning and scheduling system provided by the present application can execute the cascade water-light storage complementary planning and scheduling method of any of the above embodiments when actually running, and therefore the present embodiment will not be described here.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] Those skilled in the art can clearly understand the implementation of the various embodiments by means of software and necessary general hardware platforms through the description of the above embodiments, and of course, the implementation can also be through hardware. According to such understanding, the above technical solutions or the part of the prior art which is essentially contributed can be embodied in the form of a software product, and the computer software product can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the method of each embodiment or some part of the embodiment.

[0124] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A step water-light storage complementary planning and scheduling method, characterized in that, The method comprises the following steps: For a unit time period in a scheduling period of a cascade water-light-storage complementary system, water power resource power of a reservoir in the cascade water-light-storage complementary system is calculated according to hydrological data of the reservoir; For the unit time period, photovoltaic resource power of the cascade water-light-storage complementary system is calculated according to data of photovoltaic resources in the cascade water-light-storage complementary system; For the unit time period, abandoned light power of the cascade water-light-storage complementary system is calculated according to an external power transmission channel capacity threshold, a photovoltaic output peak value and a pumped storage power station installed capacity, and effective photovoltaic resource power is calculated according to the photovoltaic resource power and the abandoned light power; For the scheduling period, water power resource power average value and effective photovoltaic resource power average value of the unit time period are respectively calculated according to the water power resource power and the effective photovoltaic resource power of the reservoir in each unit time period in the cascade water-light-storage complementary system; Total guaranteed power of the unit time period in the scheduling period is obtained by summing the water power resource power average value and the effective photovoltaic resource power average value of the unit time period; ； In the formula, is the total guaranteed power; is the water and electricity resource power of the i th unit period; j is the water and electricity resource power of the i th unit period; is the effective photovoltaic resource power of the i th unit period; j is the effective photovoltaic resource power of the i th unit period; N is the number of unit periods contained in a scheduling period. Target power transmitted to a power grid by the cascade water-light-storage complementary system in each unit time period is calculated according to total guaranteed power of the cascade water-light-storage complementary system in the unit time period in the scheduling period; Total regulation power of the cascade water-light-storage complementary system in any unit time period is calculated according to the total guaranteed power and total resource power of the cascade water-light-storage complementary system in the unit time period; Regulation power to be borne by each reservoir is determined according to the total regulation power and a preset quota coefficient corresponding to each reservoir in the cascade water-light-storage complementary system; Water level change amount required by each reservoir is determined according to the regulation power of each reservoir and a potential energy analysis formula.

2. The step water-light storage complementary planning and dispatching method according to claim 1, characterized in that, The calculation of the water power resource power of the reservoir in the cascade water-light-storage complementary system according to the hydrological data of the reservoir comprises: The water power resource power is calculated according to water power unit efficiency, water specific weight, inflow and effective power generation water head of all reservoirs. ； In the formula, is the water and electricity resource power of the unit time period; The calculation of the photovoltaic resource power of the cascade water-light-storage complementary system according to the data of photovoltaic resources in the cascade water-light-storage complementary system comprises: is the water and electricity unit efficiency; is the specific weight of the water; is the reservoir inflow; h is the effective power generation water head.

3. The method of claim 1, wherein, The photovoltaic resource power is calculated according to photovoltaic power station installed capacity in the cascade water-light-storage complementary system, solar radiation intensity under standard test conditions, solar radiation intensity of each photovoltaic power generation time period, solar cell panel temperature of each photovoltaic power generation time period, solar cell panel temperature under standard test conditions and air temperature power conversion coefficient. The calculation of the abandoned light power of the cascade water-light-storage complementary system and the effective photovoltaic resource power according to the photovoltaic resource power and the abandoned light power comprises: ； In the formula, is the photovoltaic resource power; and is the start time and the end time of the photovoltaic power generation in the unit time period, respectively; is the installed capacity of the photovoltaic power station; and is the solar radiation intensity at any time in the unit time period t and the solar radiation intensity under standard test conditions, respectively; and is the solar cell panel temperature at any time in the unit time period t and the solar cell panel temperature under standard test conditions, respectively; is the air temperature power conversion coefficient.

4. The method of claim 1, wherein, The abandoned light power is calculated according to the photovoltaic output peak value, the pumped storage power station installed capacity, the external power transmission channel capacity threshold, photovoltaic power generation time length and a correction coefficient in the cascade water-light-storage complementary system for the unit time period. ​ ； In the formula, is the abandoned light electric quantity; T is the photovoltaic power generation duration; P is the photovoltaic output peak value; is the external power transmission channel capacity threshold value; is the correction coefficient; According to the difference between the photovoltaic resource electricity and the abandoned light electricity, the effective photovoltaic resource electricity is obtained; ； In the formula, is the effective photovoltaic resource electricity, is the photovoltaic resource electricity, is the abandoned light electricity.

5. The method of claim 1, wherein, The total adjustment electricity of the cascade water-light storage complementary system in any unit time period is calculated according to the total guaranteed electricity and the total water-light resource electricity of any unit time period, and the method comprises the following steps: The total water-light resource electricity of the unit time period is obtained by summing up the water resource electricity and the effective photovoltaic resource electricity of the unit time period; ； In the formula, is the total water-light resource power; is the water-light resource power of the unit time period; is the effective photovoltaic resource power; The total adjustment electricity of the cascade water-light storage complementary system in the unit time period is obtained according to the difference between the total guaranteed electricity of the cascade water-light storage complementary system in the unit time period and the total water-light resource electricity of the unit time period; ； In the formula, is the total regulation power; is the total guarantee power; is the total water-light resource power.

6. The method of claim 1, wherein, The adjustment electricity that each reservoir needs to bear is determined according to the total adjustment electricity and the preset quota coefficient corresponding to each reservoir in the cascade water-light storage complementary system, and the method comprises the following steps: The distribution electricity that each reservoir needs to bear is obtained according to the product of the total adjustment electricity and the preset quota coefficient corresponding to each reservoir in the cascade water-light storage complementary system; The adjustment electricity of each reservoir is obtained according to the difference between the distribution electricity of each reservoir and the corresponding total water-light resource electricity; ； In the formula, is the regulating power of any i-th reservoir in the cascade water-light storage complementary system; i is the regulating power of any i-th reservoir in the cascade water-light storage complementary system; is the preset quota coefficient of any i-th reservoir; i is the preset quota coefficient of any i-th reservoir; is the total regulating power; is the total regulating power; i is the total water-light resource power of any i-th reservoir.

7. The method of claim 1, wherein, Before the step of determining the water level change amount of each reservoir according to the adjustment electricity of each reservoir and the potential energy analysis formula, the method further comprises the following steps: A quadratic function relationship formula is obtained by performing quadratic curve fitting according to the reservoir capacity-water level relationship data of each reservoir; ； wherein W is the reservoir storage capacity; f is a quadratic function; h is the effective power generation head; a, b, c are fitting parameters; A cubic polynomial analytical expression taking the effective generating water head as an independent variable and taking the generating potential energy as a dependent variable is obtained by integral operation according to the quadratic function relationship formula; ； where Ω( ) is the electric generation potential energy function; According to the cubic polynomial analytical expression, the potential energy analysis formula is obtained; wherein the potential energy analysis formula is a function relationship formula of the generating electricity generated by the inflow in any time period and the difference between the generating potential energy value corresponding to the water level at the end of the unit time period and the generating potential energy value corresponding to the initial water level; is the efficiency of the hydroelectric unit; is the specific weight of water; The method further comprises the following steps: ； wherein E is the power generation amount of the arbitrary reservoir for the unit time period; is the power generation amount generated by the inflow under the condition that the reservoir water level is constant is the power generation amount generated by the inflow is the amount of change in the reservoir water level at the end of the unit time period compared to the water level at the beginning of the unit time period. 8.The scheduling method of claim 1, wherein, The water level of each reservoir is updated according to the water level change amount; When it is determined that the updated water level is between the normal water storage level and the dead water level of the reservoir, the scheduling of 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 coefficient corresponding to each reservoir is adjusted to recalculate until the updated water level is between the normal water storage level and the dead water level of the reservoir. The method further comprises the following steps: 9.The stepwise water-light storage complementary planning and scheduling method according to claim 1, characterized in that, When the entire scheduling period ends, the water level change curve of each reservoir, the target electricity curve of the cascade water-light storage complementary system and the light abandonment rate are generated and output. The method comprises the following steps:

10. A step water-light storage complementary planning and scheduling system, characterized in that, ​ The first processing module is configured to, for a unit time period in a scheduling period of a cascade water-light-storage complementary system, calculate water and electricity resource power of a reservoir in the cascade water-light-storage complementary system according to hydrological data of the reservoir; for the unit time period, calculate photovoltaic resource power of the cascade water-light-storage complementary system according to data of photovoltaic resources in the cascade water-light-storage complementary system; for the unit time period, calculate abandoned light power of the cascade water-light-storage complementary system according to an external power transmission channel capacity threshold, a photovoltaic output peak value and a pumped storage power station installed capacity, and calculate effective photovoltaic resource power according to the photovoltaic resource power and the abandoned light power; for the scheduling period, calculate water and electricity resource power average value and effective photovoltaic resource power average value of each unit time period respectively according to the water and electricity resource power and the effective photovoltaic resource power of the reservoir in each unit time period in the cascade water-light-storage complementary system; and sum the water and electricity resource power average value and the effective photovoltaic resource power average value of the unit time period to obtain total guaranteed power of the unit time period in the scheduling period; ； In the formula, is the total guaranteed power; is the water and electricity resource power of the i th unit period; j is the water and electricity resource power of the i th unit period; is the effective photovoltaic resource power of the i th unit period; j is the effective photovoltaic resource power of the i th unit period; N is the number of unit periods contained in one scheduling period; The first processing module is further configured to calculate target power delivered by the cascade water-light-storage complementary system to a power grid in each unit time period according to total guaranteed power of the cascade water-light-storage complementary system in the unit time period in the scheduling period; The second processing module is configured to calculate total regulation power of the cascade water-light-storage complementary system in any unit time period according to the total guaranteed power and total resource power of the cascade water-light-storage complementary system in the unit time period; The third processing module is configured to determine regulation power to be borne by each reservoir according to the total regulation power and a preset quota coefficient corresponding to each reservoir in the cascade water-light-storage complementary system; The fourth processing module is configured to determine water level change amount required by each reservoir according to the regulation power of each reservoir and a potential energy analysis formula.

11. An electronic device comprising a memory, a processor, and a computer program stored on the memory and running on the processor, characterized in that, The processor executes the computer program to implement the cascade water-light-storage complementary planning and scheduling method according to any one of claims 1 to 9.

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