A method and equipment for identifying the patterns of water and electricity wastage in hydro-wind-solar systems

Abstract

This invention belongs to the field of hydro-wind-solar hybrid system scheduling, specifically providing a method and equipment for identifying the patterns of water and electricity curtailment in hydro-wind-solar systems. The method includes the following steps: Step 1, constructing an economic operation model of the hydro-wind-solar system adapted to the power generation plan; Step 2, simulating the water and electricity curtailment process of the system considering multiple input scenarios, and fitting the system's water and electricity curtailment loss curve. This invention proposes and establishes an economic operation model of the hydro-wind-solar system adapted to the power generation plan, considering wind and solar uncertainties, possible initial water levels, and power generation plans, simulating the system's water and electricity curtailment process, and fitting the system's water and electricity curtailment loss curve. This model can identify the patterns of water and electricity curtailment in hydro-wind-solar hybrid systems, providing support for scientific scheduling decisions of hydro-wind-solar hybrid systems.

Description

Technical Field

[0001] This invention belongs to the field of water-wind-solar hybrid system scheduling, specifically, it relates to a method and equipment for identifying the patterns of water and electricity wastage in water-wind-solar systems. Background Technology

[0002] Hydro-wind-solar hybrid systems offer a novel approach to addressing the challenges of integrating wind and solar power. Given the inherent uncertainties in wind and solar power output, the reservoir's storage capacity and the rapid regulation capabilities of hydropower units can be utilized to offset these fluctuations, ensuring the total output of the hydro-wind-solar hybrid system meets grid stability requirements. The coordinated operation of these systems is beneficial for promoting the high-quality development of clean energy.

[0003] Current methods for coordinating the operation of hydro-wind-solar hybrid systems typically focus on the system's scheduling and operation modes, while neglecting to explore the inherent patterns and characteristics of water and electricity wastage within the system itself. Therefore, this invention provides a method for identifying the patterns of water and electricity wastage in hydro-wind-solar hybrid systems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method and equipment for identifying the patterns of water and electricity curtailment in a hydro-wind-solar hybrid system, so as to identify the patterns of water and electricity curtailment in the hydro-wind-solar hybrid system and provide support for the scientific scheduling decision of the hydro-wind-solar hybrid system.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for identifying the patterns of water and electricity wastage in hydropower, wind power, and solar power systems, comprising the following steps:

[0006] Step 1: Construct an economic operation model for a hydro-wind-solar system adapted to the power generation plan;

[0007] Step 2: Consider the multi-scenario input simulation of the water and electricity wastage process and fit the water and electricity wastage loss curve of the system.

[0008] In the preferred embodiment, step one includes the following steps:

[0009] S101. Determine the hydropower output based on the actual wind and solar power output and the system power generation plan;

[0010] S102. Construct an economic operation model for hydro-wind-solar systems that is adapted to the power generation plan.

[0011] In the preferred embodiment, in step S101, the expression for determining the hydropower output based on the actual wind and solar power output and the system power generation plan is as follows:

[0012] (1);

[0013] (2);

[0014] In the formula: For the first Hydropower station output during certain periods; For the first Wind power output during certain periods; For the first The output of the photovoltaic power station during the period; For the first The system's planned power output during specific time periods; The power output of the hydropower station corresponding to the minimum outflow rate; The installed capacity of the hydropower station; For the first Minimum outflow from the hydropower station during the specified time period; For the first The net head of the hydropower station during the specified period; The equation for the dynamic characteristic curve of the hydroelectric generator unit is given.

[0015] In the preferred embodiment, in step S102, the expression for the economic operation model of the hydro-wind-solar system in the power generation plan is:

[0016] (3);

[0017] In the formula: This refers to the process of water outflow from the reservoir. This refers to the water consumption of the hydropower station. This refers to the number of hydropower units. Number of scheduling periods; For the first Time period The unit is in start-up / shutdown status, when the unit is started. =1, when the unit is shut down =0; For the first Time period Power generation flow of the unit; For time intervals; These are respectively hydropower, wind power, solar power, and planned power generation output series; For output constraints; This is a hydraulic constraint condition.

[0018] In the preferred embodiment, step two includes the following operational steps:

[0019] S201. Generate a set of multiple scenarios for wind and solar power output based on Copula theory, and simulate the system operation process given the initial water level and power generation plan.

[0020] S202. Calculate the wind and solar curtailment rate based on the proposed curtailment sequence of the hydro-wind-solar system.

[0021] S203. Calculate the amount of water wasted based on the power generation flow and the outflow;

[0022] S204. Fitting the system power curtailment loss curves under different initial water levels;

[0023] S205. Fit the system water loss curves under different initial water levels.

[0024] In the preferred embodiment, the formula for calculating the wind and solar curtailment rate in step S202 is as follows:

[0025] (4);

[0026] (5);

[0027] In the formula: For the system number During periods of wind and solar power curtailment and power generation; The curtailment rate of wind and solar power in the system.

[0028] In the preferred embodiment, the formula for calculating the amount of water wasted in step S203 is:

[0029] (6);

[0030] In the formula: For the first Hydropower station outflow during specific time periods; For the first Hydropower station power generation flow during a given period; This refers to the amount of water discarded by the system.

[0031] In the preferred embodiment, in step S204, the expression for the system power curtailment loss curve under different initial water levels is:

[0032] (7);

[0033] In the formula: This is the initial water level; To achieve the system's planned peak power output; This is the curve showing the system's power curtailment loss.

[0034] In the preferred embodiment, in step S205, the expression for the system water loss curve under different initial water levels is:

[0035] (8);

[0036] In the formula: This is the system's water loss curve.

[0037] The present invention also provides an electronic device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the above-described method for identifying the patterns of water and electricity wastage in a hydro-wind-solar system.

[0038] The present invention provides a method and equipment for identifying the patterns of water and electricity wastage in a hydro-wind-solar system, which has the following beneficial effects:

[0039] 1. An economic operation model for a hydro-wind-solar hybrid system adapted to power generation plans was proposed and established. Considering the uncertainties of wind and solar power generation, possible initial water levels, and power generation plans, the model simulates the system's water and electricity curtailment process, fits the system's water and electricity curtailment loss curves, and identifies the relationship between the system's water curtailment volume and curtailment rate and the peak power generation plan and initial water level. This invention can identify the water and electricity curtailment patterns of hydro-wind-solar hybrid systems, providing support for scientific scheduling decisions for these systems.

[0040] 2. A method for plotting water and electricity curtailment loss curves of hydro-wind-solar systems is proposed. Relevant variables of water and electricity curtailment in hydro-wind-solar systems are identified, and the response relationships between water curtailment volume, electricity curtailment rate and their corresponding variables are established. The curtailment loss of hydro-wind-solar systems can be quantitatively calculated from the water and electricity curtailment loss curves of hydro-wind-solar systems based on initial conditions such as system power generation plan and initial water level, which helps system managers make rapid decisions and emergency responses. Attached Figure Description

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0042] Figure 1 This is a schematic diagram of the implementation steps of the method of the present invention;

[0043] Figure 2 This is the water wastage loss curve of the water-wind-solar system involved in the embodiments of the present invention;

[0044] Figure 3 This is the curtailment loss curve of the hydro-wind-solar system involved in the embodiments of the present invention. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0046] Example 1:

[0047] like Figure 1 As shown, a method for identifying the patterns of water and electricity wastage in a hydro-wind-solar hybrid system includes the following steps:

[0048] Step 1: Construct an economic operation model for the hydro-wind-solar system adapted to the power generation plan.

[0049] Specifically, the following steps are included:

[0050] S101. Determine hydropower output based on actual wind and solar power output and system power generation plan:

[0051] (1);

[0052] (2);

[0053] In the formula: For the first Hydropower station output during certain periods; For the first Wind power output during certain periods; For the first The output of the photovoltaic power station during the period; For the first The system's planned power output during specific time periods; The power output of the hydropower station corresponding to the minimum outflow rate; The installed capacity of the hydropower station; For the first Minimum outflow from the hydropower station during the specified time period; For the first The net head of the hydropower station during the specified period; This is the power characteristic curve of the hydroelectric generator unit.

[0054] S102. Construct an economic operation model for hydro-wind-solar systems adapted to power generation plans:

[0055] (3);

[0056] In the formula: This refers to the process of water outflow from the reservoir. This refers to the water consumption of the hydropower station. This refers to the number of hydropower units. Number of scheduling periods; For the first Time period The unit is in start-up / shutdown status, when the unit is started. =1, when the unit is shut down =0; For the first Time period Power generation flow of the unit; For time intervals; These are respectively hydropower, wind power, solar power, and planned power generation output series; For output constraints; This is a hydraulic constraint condition.

[0057] Step 2: Consider the multi-scenario input simulation of the water and electricity wastage process and fit the water and electricity wastage loss curve of the system.

[0058] The specific operating steps are as follows:

[0059] S201. Generate a set of multiple scenarios for wind and solar power output based on Copula theory, and simulate the system operation process given the initial water level and power generation plan.

[0060] S202. Calculate the wind and solar curtailment rate based on the proposed curtailment sequence of the hydro-wind-solar system:

[0061] (4);

[0062] (5);

[0063] In the formula: For the system number During periods of wind and solar power curtailment and power generation; The curtailment rate of wind and solar power in the system.

[0064] S203. Calculate the amount of water wasted based on the power generation flow and the outflow:

[0065] (6);

[0066] In the formula: For the first Hydropower station outflow during specific time periods; For the first Hydropower station power generation flow during a given period; This refers to the amount of water discarded by the system.

[0067] S204. Fitting the system's power curtailment loss curves under different initial water levels:

[0068] (7);

[0069] In the formula: This is the initial water level; To achieve the system's planned peak power output; This is the system's power curtailment loss curve;

[0070] S205. Fitting the system's water loss curves under different initial water levels:

[0071] (8);

[0072] In the formula: This is the system's water loss curve.

[0073] Example 2:

[0074] Taking the downstream hydro-wind-solar hybrid system of the Jinsha River as an example, the downstream hydropower stations of the Jinsha River include the Wudongde, Baihetan, Xiluodu, and Xiangjiaba cascades, with installed capacities of 10200MW, 16000MW, 13860MW, and 6400MW, respectively. Using the measured flow data in 2023 as the model input, the method proposed in this invention is used to construct an economic operation model of the hydro-wind-solar system adapted to the power generation plan. The model considers multiple scenarios of wind and solar power output input to simulate the system's water and electricity curtailment process and fits the system's water and electricity curtailment loss curve.

[0075] The system's water loss curve is attached. Figure 2 As shown in the figure, the system's water discharge is functionally related to the initial water level during the scheduling period and the planned peak power generation. As the planned peak power generation output increases, the water discharge from hydropower stations shows a decreasing trend, but the rate of decrease varies for different reservoirs and initial water levels. For the same hydropower station, as the initial water level during the scheduling period increases, the net head of the hydropower units increases, the water consumption per unit of hydropower decreases, and water discharge increases when the planned peak power generation output remains the same. For different hydropower stations, the rate of decrease in water discharge as the planned peak power generation output increases differs.

[0076] The system's power curtailment loss curve is attached. Figure 3 As shown in the figure, the system curtailment rate is functionally related to the initial water level during the dispatch period and the peak power generation plan. With the increase of the peak power generation plan, the wind and solar curtailment rate shows a downward trend. For the same hydropower station, with the increase of the initial water level during the dispatch period, the net head of the hydropower units increases, the hydropower generated per unit of water consumption increases, and when the system's peak power generation plan is the same, the average daily hydropower output increases, while wind and solar curtailment increases. For different hydropower stations, the rate of decrease in the wind and solar curtailment rate with the increase of the system's peak power generation plan varies.

[0077] Example 3:

[0078] An electronic device is characterized by comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the above-mentioned method for identifying the patterns of water and electricity wastage in a hydro-wind-solar system.

[0079] The processor can be a central processing unit (CPU). The processor can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips.

[0080] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules. The processor executes various functional applications and data processing by running the non-transitory software programs, instructions, and modules stored in the memory, thereby implementing the method for identifying the patterns of water and electricity wastage in the hydropower, wind power, and solar power systems described in the above embodiments. Furthermore, the memory may include high-speed random access memory and non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0081] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for identifying the patterns of water and electricity wastage in a hydro-wind-solar system, characterized in that, Includes the following steps: Step 1: Construct an economic operation model for a hydro-wind-solar system adapted to the power generation plan; Step 2: Considering the multi-scenario input simulation of the water and electricity wastage process, fit the system's water and electricity wastage loss curve, including the following steps: S201. Generate a set of multiple scenarios for wind and solar power output based on Copula theory, and simulate the system operation process given the initial water level and power generation plan. S202. Calculate the wind and solar curtailment rate based on the proposed curtailment sequence of the hydro-wind-solar system. The formula for calculating the wind and solar curtailment rate is as follows: （4）； （5）； In the formula: For the system number During periods of wind and solar power curtailment and power generation; The system's wind and solar power curtailment rate; S203. Calculate the amount of water to be wasted based on the power generation flow and the outflow. The formula for calculating the amount of water to be wasted is as follows: （6）； In the formula: For the first Hydropower station outflow during specific time periods; For the first Hydropower station power generation flow during a given period; This refers to the amount of water discarded by the system. S204. Fitting the system power curtailment loss curves under different initial water levels; The expressions for the system's power curtailment loss curves under different initial water levels are as follows: （7）； In the formula: This is the initial water level; To achieve the system's planned peak power output; This is the system's power curtailment loss curve; S205. Fit the system's water discharge loss curves under different initial water levels. The expression for the system's water discharge loss curves under different initial water levels is: （8）； In the formula: This is the system's water loss curve.

2. The method for identifying the patterns of water and electricity wastage in a hydro-wind-solar system according to claim 1, characterized in that: Step one includes the following steps: S101. Determine the hydropower output based on the actual wind and solar power output and the system power generation plan; S102. Construct an economic operation model for hydro-wind-solar systems that is adapted to the power generation plan.

3. The method for identifying the patterns of water and electricity wastage in a hydro-wind-solar system according to claim 2, characterized in that: In step S101, the expression for determining the hydropower output based on the actual wind and solar power output and the system power generation plan is as follows: （1）； （2）； In the formula: For the first Hydropower station output during certain periods; For the first Wind power output during certain periods; For the first The output of the photovoltaic power station during the period; For the first The system's planned power output during specific time periods; The power output of the hydropower station corresponding to the minimum outflow rate; The installed capacity of the hydropower station; For the first Minimum outflow from the hydropower station during the specified time period; For the first The net head of the hydropower station during the specified period; The equation for the dynamic characteristic curve of the hydroelectric generator unit is given.

4. The method for identifying the patterns of water and electricity wastage in a hydro-wind-solar system according to claim 2, characterized in that: In step S102, the expression for the economic operation model of the hydro-wind-solar system in the power generation plan is as follows: （3）； In the formula: This refers to the process of water outflow from the reservoir. This refers to the water consumption of the hydropower station. This refers to the number of hydropower units. Number of scheduling periods; For the first Time period The unit is in start-up / shutdown status, when the unit is started. =1, when the unit is shut down =0; For the first Time period Power generation flow of the unit; For time intervals; These are respectively hydropower, wind power, solar power, and planned power generation output series; For output constraints; This is a hydraulic constraint condition.

5. An electronic device, characterized in that, include: The system includes a memory and a processor, which are interconnected. The memory stores computer instructions, and the processor executes the computer instructions to perform the water and electricity abandonment pattern identification method as described in any one of claims 1 to 4.

Images