CN113890108B

CN113890108B - Horizontal type water pumping and energy storage based wind-solar-water energy storage multi-energy complementary system

Info

Publication number: CN113890108B
Application number: CN202110975508.3A
Authority: CN
Inventors: 王浩; 王超; 蒋云钟; 雷晓辉; 杨明翔; 李翠梅
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-24
Filing date: 2021-08-24
Publication date: 2022-09-02
Anticipated expiration: 2041-08-24
Also published as: CN113890108A

Abstract

The application relates to a wind, light and water storage multi-energy complementary system based on horizontal water pumping and energy storage, in particular to the field of new energy. The wind, light and water storage multi-energy complementary system comprises: wind power stations, photovoltaic power stations, horizontal pumped storage power stations and power station control equipment; the wind power station, the photovoltaic power station and the horizontal pumped storage power station are connected with one another through power lines; the horizontal pumped storage power station comprises a hydroelectric generating set, a pump machine set and a pump machine lower pool; the power station control equipment is used for controlling at least one of the hydroelectric generating set and the pump machine set according to the wind power and the photoelectric power. According to the scheme, the hydro-power unit and the pump unit are arranged in the horizontal pumped storage power station, so that redundant output of the wind-light-water storage multi-energy system is absorbed under the condition that the output of the wind-light-water storage multi-energy system is ensured, and resource waste of the wind-light-water storage complementary system is avoided as much as possible.

Description

Horizontal type water pumping and energy storage based wind-solar-water energy storage multi-energy complementary system

Technical Field

The application relates to the field of new energy, in particular to a wind, light and water energy storage multi-energy complementary system based on horizontal water pumping and energy storage.

Background

Under the pressure of the petrochemical energy crisis, the construction of clean energy power grids with high proportion rate has become the mainstream trend of power grids of various countries in the world, and wind power generation, photovoltaic power generation and hydroelectric power generation occupy important positions in the field of new energy.

The wind and light output frequent fluctuation caused by the randomness and intermittence of wind and light resources in time and space greatly aggravates the pressure of power grid peak regulation and frequency modulation, has great influence on the safe and stable operation of a power system, limits the wind and light absorption capacity of the power grid, and the access of a large-scale energy storage system to the power grid is one of the best choices for solving the problems. The watershed cascade reservoir group is a huge energy storage system, and water and electricity are delivered together with wind and light electricity to form a wind, light and water storage complementary system so as to realize regulation of wind and light electricity output fluctuation through water and electricity.

In the scheme, when the wind and photovoltaic installation scale is larger than that of the hydroelectric installation, the adjustment capacity of the cascade reservoir to the radial flow is limited, and the wind, photovoltaic and water storage complementary system still has certain resource waste.

Disclosure of Invention

The application provides a wind-light-water energy storage multi-energy complementary system based on horizontal water pumping and energy storage, avoids resource waste of the wind-light-water energy storage complementary system as far as possible, and the technical scheme is as follows.

On one hand, the wind-light-water-storage multi-energy complementary system based on horizontal water pumping and energy storage is provided, and comprises a wind power station, a photovoltaic power station, a horizontal water pumping and energy storage power station and power station control equipment; the wind power station, the photovoltaic power station and the horizontal pumped storage power station are connected with one another through power lines;

the wind power station is used for generating corresponding wind power according to the wind power intensity when receiving wind power;

the photovoltaic power station is used for producing corresponding photoelectric power according to the illumination intensity when receiving illumination;

the horizontal pumped storage power station comprises a hydroelectric generating set, a pump machine set and a pump machine lower pool; the hydroelectric generating set is used for conveying water at the upstream of the dam of the horizontal pumped storage power station to the downstream of the dam and generating corresponding hydroelectric power; the pump machine set is used for communicating the dam downstream with the dam upstream and transmitting the water downstream to the dam upstream when receiving the electric power;

the power station control equipment is used for controlling at least one of the hydroelectric generating set and the pump machine set according to the wind power and the photoelectric power so as to adjust the total output value of the wind, light, water and energy storage multi-energy complementary system.

In another aspect, a method for determining parameters of a wind-solar-water-storage multi-energy complementary system is provided, wherein the wind-solar-water-storage multi-energy complementary system comprises a wind power station, a photovoltaic power station, a horizontal pumped storage power station and a power station control device; the wind power station, the photovoltaic power station and the horizontal pumped storage power station are connected with each other through power lines, and the method comprises the following steps:

acquiring a wind-electricity total output value at each moment according to the wind-electricity output condition of the wind power station at each moment and the photoelectric output condition of the photovoltaic power station at each moment;

determining the maximum value in the wind-solar-electricity total output values at all the moments as an initial system total output value of the wind-solar-water storage multi-energy complementary system;

acquiring a hydropower compensation output value of the horizontal pumped storage power station according to the initial system total output value, and iteratively updating hydropower station operation parameters according to the relation between the hydropower compensation output and the hydropower guarantee output so as to obtain updated hydropower station operation parameters; the hydropower guaranteed output is used for indicating the hydropower output of the horizontal pumped storage power station required by the complementary system;

and the power station control equipment indicates the output process of the hydroelectric generating set of the horizontal pumped storage power station and the pumped storage process of the pump generating set through the operation parameters of the hydroelectric generating station.

In another aspect, a parameter determination device for a wind-solar-water-storage multi-energy complementary system is provided, wherein the wind-solar-water-storage multi-energy complementary system comprises a wind power station, a photovoltaic power station, a horizontal pumped storage power station and a power station control device; wind power station, photovoltaic power generation station, horizontal pumped storage power plant pass through power line interconnect between the station, the device includes:

the wind-photovoltaic power generation system comprises a wind-photovoltaic acquisition module, a wind-photovoltaic power generation module and a photovoltaic power generation module, wherein the wind-photovoltaic acquisition module is used for acquiring a wind-photovoltaic total output value at each moment according to wind power output conditions of the wind power generation station at each moment and photovoltaic output conditions of the photovoltaic power generation station at each moment;

the initial value acquisition module is used for determining the maximum value in the wind-solar-electric total output values at all the moments as the initial system total output value of the wind-solar-water-storage multi-energy complementary system;

the iterative updating module is used for acquiring a hydropower compensation output value of the horizontal pumped storage power station according to the initial system total output value, and iteratively updating the hydropower station operation parameters according to the relationship between the hydropower compensation output and the hydropower guaranteed output so as to acquire the updated hydropower station operation parameters; the hydropower guaranteed output is used for indicating the hydropower output of the horizontal pumped storage power station required by the complementary system;

In one possible implementation, the hydropower station operating parameters include a hydropower compensation output value and a pumping power value; the hydroelectric compensation output value is used for indicating the output process of a hydroelectric generating set of the horizontal pumped storage power station; the pumping power value is used for indicating the pumping energy storage process of the pump unit;

the iterative update module comprises:

the pump machine capacity acquisition module is used for acquiring the installed capacity of the pump machine with the installed utilization rate meeting specified conditions;

the hydropower compensation output value acquisition module is used for determining a hydropower compensation output value and a pumping power value according to the relation between the initial system total output value and the wind-photovoltaic total output value;

and the iteration updating unit is used for updating the initial system total output value according to the mean value of the hydroelectric compensation output value at each moment and the difference value of the hydroelectric guaranteed output so as to determine the hydroelectric compensation output value and the pumping power value according to the updated system total output value.

In one possible implementation, the apparatus further includes:

the external transmission capacity acquisition module is used for carrying out weighted average processing on the preset installed capacity of the wind power station, the preset installed capacity of the photovoltaic power station and the average power generation amount of the hydroelectric generating set according to time information to obtain the maximum capacity of an electric power external transmission surface;

the wind, light and water output value acquisition module is used for accumulating the wind, light and water output value and the water and electricity compensation output value to obtain a wind, light and water output value;

and the abandoned electric quantity acquisition module is used for comparing the wind-solar-water output value, the updated system total output value and the maximum capacity of the power delivery surface to obtain abandoned electric quantity of the wind-solar-water storage multi-energy complementary system.

In one possible implementation, the horizontal pumped-hydro energy storage power station further comprises a lower pump pool located downstream of the dam;

the device further comprises:

the lower pool capacity determining module is used for determining the lower pool capacity of the lower pool of the pump according to the pumping power values of the pump unit at all times;

and the lower pool parameter determining module is used for determining the corresponding lower pool parameters of each component of the lower pool of the pump machine according to the lower pool capacity.

In one possible implementation, the pump lower pool comprises a water inlet gate, a water outlet gate and a barrage; the water inlet gate is used for introducing water in a river channel into the lower pool of the pump; the water outlet gate is used for returning water in the lower pump pool to a natural river channel when the water level in the lower pump pool is higher than a threshold value; the barrage is used for separating the lower pool of the pump from the river channel;

the lower pond parameters comprise at least one of the height of the bottom of the diversion gate, the width of the diversion gate, the height of the top of the diversion gate, the height of the diversion port of the lower pond, the length of the lower pond and the distance between the lower pond and the bank.

In still another aspect, a computer device is provided, and the computer device includes a processor and a memory, where the memory stores at least one instruction, and the at least one instruction is loaded and executed by the processor to implement the above-mentioned parameter determination method for a wind, light, water and energy storage multi-energy complementary system.

In still another aspect, a computer-readable storage medium is provided, and the storage medium stores at least one instruction, and the at least one instruction is loaded and executed by a processor to implement the above-mentioned parameter determination method for a wind, light, water and energy storage multi-energy complementary system.

In yet another aspect, a computer program product or computer program is provided, the computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions, so that the computer device executes the method for determining the parameters of the wind, light, water and energy storage multi-energy complementary system.

The technical scheme provided by the application can comprise the following beneficial effects:

the wind power, the photoelectricity and the hydropower are connected into a power grid together, when the wind power and the photoelectricity power fluctuation are adjusted through the hydropower, the hydropower equipment can be designed into a horizontal type pumped storage power station in the wind-light-water-storage multi-energy complementary system, a hydroelectric generating set in the horizontal type pumped storage power station can be used for complementing wind power and photoelectricity troughs, and a pumping machine set in the horizontal type pumped storage power station is used for absorbing wind power and photoelectricity wave crests, so that the purpose of absorbing redundant wind-light output of the wind-light-water-storage multi-energy system under the condition of ensuring the output of the wind-light-water-storage multi-energy system is achieved, and the resource waste of the wind-light-water-storage complementary system is avoided as much as possible.

Drawings

In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a wind-solar-water-energy-storage complementary system based on horizontal water pumping and energy storage according to an exemplary embodiment;

FIG. 2 is a schematic structural diagram of a horizontal water pumping and energy storage based wind-solar-water energy storage complementary system according to an exemplary embodiment;

FIG. 3 is a schematic structural diagram illustrating a parameter determination system of a wind, photovoltaic and water storage multi-energy complementary system according to an exemplary embodiment;

FIG. 4 is a method flow diagram illustrating a method for determining parameters of a wind, photovoltaic, water and energy storage multi-energy complementary system according to an exemplary embodiment;

FIG. 5 is a method flow diagram illustrating a method for determining parameters of a wind, photovoltaic, water and energy storage multi-energy complementary system according to an exemplary embodiment;

FIG. 6 is a schematic diagram illustrating a method for calculating engineering parameters of a wind, photovoltaic and water energy-storage multi-energy complementary system according to an exemplary embodiment;

FIG. 7 is a schematic diagram illustrating a monthly-based average hydropower generation process in a watershed according to the embodiment shown in FIG. 6;

FIG. 8 is a schematic diagram illustrating a monthly wind power and photovoltaic output coefficient in a watershed according to the embodiment shown in FIG. 6;

FIG. 9 is a schematic diagram illustrating hourly output characteristic values of wind power and photovoltaic power in a typical day in a drainage basin according to the embodiment shown in FIG. 6;

FIG. 10 is a schematic view of the embodiment of FIG. 6 in relation to the use of the outbound channel;

FIG. 11 is a schematic view of a typical solar wind, photovoltaic power, hydroelectric power, and electricity curtailment for the embodiment of FIG. 6;

fig. 12 is a schematic diagram illustrating a wind, light and water output process corresponding to the horizontal pumped storage according to the embodiment shown in fig. 6;

FIG. 13 is a schematic diagram illustrating a typical daily power generation and pumping process of a pumped-storage power plant according to the embodiment shown in FIG. 6;

FIG. 14 is a diagram illustrating a result of a condition adjustment according to the embodiment shown in FIG. 6; (ii) a

FIG. 15 is a schematic representation of the lower pool engineering parameters involved in the embodiment shown in FIG. 6;

FIG. 16 illustrates a wind, light, water and energy storage multi-energy complementary system parameter determination device provided in accordance with an exemplary embodiment;

fig. 17 shows a block diagram of a computer device according to an exemplary embodiment of the present application.

Detailed Description

The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be understood that "indication" mentioned in the embodiments of the present application may be a direct indication, an indirect indication, or an indication of an association relationship. For example, a indicates B, which may mean that a directly indicates B, e.g., B may be obtained by a; it may also mean that a indicates B indirectly, for example, a indicates C, and B may be obtained by C; it can also be shown that there is an association between a and B.

In the description of the embodiments of the present application, the term "correspond" may indicate that there is a direct correspondence or an indirect correspondence between the two, may also indicate that there is an association between the two, and may also indicate and be indicated, configure and configured, and so on.

In the embodiment of the present application, "predefining" may be implemented by saving a corresponding code, table, or other manners that may be used to indicate related information in advance in a device (for example, including a terminal device and a network device), and the present application is not limited to a specific implementation manner thereof.

Fig. 1 is a schematic structural diagram of a wind-solar-water-storage multi-energy complementary system based on horizontal water pumping and energy storage according to an exemplary embodiment. The wind, light, water and energy storage multi-energy complementary system comprises a wind power station 110, a photovoltaic power station 120, a horizontal pumped storage power station 130 and power station control equipment (not shown in the figure); the wind power station, the photovoltaic power station and the horizontal pumped storage power station are connected with one another through power lines;

the wind power station is used for generating corresponding wind power according to the wind strength when receiving wind power;

the power station control equipment is used for controlling the hydroelectric generating set and the pump machine set according to the wind power and the photoelectric power so as to adjust the total output value of the wind, light, water and energy storage multi-energy complementary system.

For example, when the wind power and the photovoltaic power are supplied with more energy in a specified time, the power station control equipment can reduce the generated power of the hydroelectric generating set; when the hydroelectric generating set stops generating electricity and the wind power and the photoelectric power still exceed the threshold value (namely, electricity abandoning condition exists), the surplus electric quantity can be transmitted to the pump machine set, and the pump machine set transmits water at the downstream of the dam to the upstream of the dam so as to convert the surplus electric quantity into potential energy of the water and store the potential energy into the horizontal pumped storage power station.

When the energy supply of the wind power and the photoelectric power in the designated time is less, the power station control equipment can increase the generating power of the hydroelectric generating set, and the wind power and the photoelectric power are supplemented through the hydropower to ensure the power supply strength of the wind, light and water energy storage multi-energy complementary system.

In summary, when wind power, photoelectricity and hydroelectric power are connected to a power grid together, and the wind power and the photoelectric power fluctuation are adjusted through hydroelectric power, hydroelectric equipment can be designed into a horizontal pumped storage power station in the wind-light-water-storage multi-energy complementary system, a hydroelectric unit in the horizontal pumped storage power station can be used for complementing wind power and photoelectric wave troughs, and a pumping unit in the horizontal pumped storage power station is used for absorbing wind power and photoelectric wave crests, so that the redundant output of the wind-light-water-storage multi-energy system is absorbed under the condition that the output of the wind-light-water-storage multi-energy system is ensured, and the resource waste of the wind-light-water-storage complementary system is avoided as much as possible.

Fig. 2 is a schematic structural diagram of a wind-solar-water-storage multi-energy complementary system based on horizontal water pumping and energy storage according to an exemplary embodiment. The wind, light and water storage multi-energy complementary system comprises a wind power station 210, a photovoltaic power station 220, a horizontal pumped storage power station 230 and a power station control device; the wind power station, the photovoltaic power station and the horizontal pumped storage power station are connected with one another through power lines;

the horizontal pumped storage power station comprises a hydroelectric generating set and a pump generating set; the hydroelectric generating set is used for conveying water at the upstream of the dam of the horizontal pumped storage power station to the downstream of the dam and generating corresponding hydroelectric power; the pump assembly is configured to communicate the dam downstream with the dam upstream and to deliver water from the dam downstream to the dam upstream upon receipt of power.

The horizontal pumped-storage power station further comprises a pump lower pool located downstream of the dam.

The lower pump pool comprises a water inlet gate, a water outlet gate and a barrage; the water inlet gate is used for introducing water in a river channel into the lower pump pool; the water outlet gate is used for returning water in the lower pump pool to a natural river channel when the water level in the lower pump pool is higher than a threshold value; the barrage is used for separating the lower pool of the pump from the river channel.

The pump assembly is configured to communicate the pumper sumps downstream of the dam with the dam upstream and to deliver water from the pumper sumps to the dam upstream upon receipt of power.

Optionally, the wind, light, water and energy storage multi-energy complementary system further comprises an intelligent monitoring system, in order to guarantee safety and stability of system power production, a set of intelligent monitoring system for monitoring the state of all elements in the power generation production process can be deployed, parameters of all modules of the wind, light, water and energy storage multi-energy complementary system are monitored in real time, the purpose of monitoring the state of the multiple elements such as water, gas, oil and electricity in real time is achieved, and early diagnosis and timely early warning of the wind, light, water and energy storage multi-energy complementary system are achieved.

Optionally, the wind, light, water and energy storage multi-energy complementary system further comprises an intelligent power generation control system, and the intelligent power generation control system can be a power generation production control system for intelligently controlling the output of a wind power plant, a photovoltaic power plant and a horizontal pumped storage power station and the pumped power of the horizontal pumped storage power station.

The intelligent power generation control system can comprise a hydroelectric generating set automatic power generation control system for controlling a hydroelectric generating set, a wind generating set automatic power generation control system for controlling a wind power station, a photovoltaic automatic power generation control system for controlling a photovoltaic power station, a pump station automatic control system for controlling a pump set, and a system complementary power generation control system for adjusting the relation among the control systems according to the generated energy of each area of the wind, light, water and energy storage multi-energy complementary system.

Optionally, the system complementary power generation control system is further configured to receive a power generation instruction issued by the power grid, and optimize and distribute the output of each of the photovoltaic power plant, the wind power plant, and the hydroelectric generating set and the power of the water pumping pump station in real time based on the monitoring data acquired by the intelligent monitoring system in real time and the wind and light output prediction data, with the system running optimal as a target.

Optionally, the photovoltaic automatic power generation control system is further configured to execute an output instruction of the system complementary power generation control system, adjust the operation mode of the photovoltaic unit in real time, and feed back the execution condition.

Optionally, the automatic power generation control system of the wind turbine generator is further configured to execute an output instruction of the system complementary power generation control system, adjust an operation mode of the wind turbine generator in real time, and feed back an execution condition.

Optionally, the automatic power generation control system of the hydroelectric generating set is further used for executing an output instruction of the system complementary power generation control system, adjusting the operation mode of the hydroelectric generating set in real time, and feeding back the execution condition.

Optionally, the pump station automatic control system is further configured to execute a power instruction of the system complementary power generation control system, and adjust an operation mode of the pump station in real time.

In summary, the wind power, the photovoltaic power and the hydroelectric power are connected to the power grid together, so that when the wind power and the photovoltaic power fluctuation are adjusted through the hydroelectric power, the hydroelectric equipment can be designed into a horizontal pumped storage power station in the wind-light-water-storage multi-energy complementary system, a hydroelectric unit in the horizontal pumped storage power station can be used for complementing wind power and photovoltaic wave troughs, and a pump unit in the horizontal pumped storage power station is used for absorbing wind power and photovoltaic wave crests, so that the redundant output of the wind-light-water-storage multi-energy system is absorbed under the condition of ensuring the output of the wind-light-water-storage multi-energy system, and the resource waste of the wind-light-water-storage complementary system is avoided as much as possible.

FIG. 3 is a schematic structural diagram of a parameter determination system of a wind, light, water and energy storage multi-energy complementary system according to an exemplary embodiment. The parameter determination system of the wind, light, water and energy storage multi-energy complementary system comprises a terminal device 310 and a server 320.

The parameters of the wind, light and water energy complementary system can be determined in the terminal device 310 or the server 320.

Alternatively, a calculation method corresponding to the wind, light, water and energy storage multi-energy complementary system may be executed by the data processor of the terminal device 310, so as to determine parameters of the wind, light, water and energy storage multi-energy complementary system.

Alternatively, the parameters of the wind, light, water and energy complementation system calculated by the terminal device 310 can be stored in the data storage of the terminal device 310.

Optionally, the parameters of the wind, light, water and energy complementation system calculated by the terminal device 310 can be sent through a wired or wireless network and stored in the data storage of the server 320.

Optionally, the server may be an independent physical server, a server cluster formed by a plurality of physical servers, or a distributed system, and may also be a cloud server that provides technical computing services such as cloud service, a cloud database, cloud computing, a cloud function, cloud storage, network service, cloud communication, middleware service, domain name service, security service, CDN, and a big data and artificial intelligence platform.

Optionally, the wireless or wired networks described above use standard communication techniques and/or protocols. The network is typically the internet, but may be any other network including, but not limited to, a local area network, a metropolitan area network, a wide area network, a mobile, a limited or wireless network, a private network, or any combination of virtual private networks. In some embodiments, data exchanged over the network is represented using techniques and/or formats including hypertext markup language, extensible markup language, and the like. All or some of the links may also be encrypted using conventional encryption techniques such as secure sockets layer, transport layer security, virtual private network, internet protocol security, and the like. In other embodiments, custom and/or dedicated data communication techniques may also be used in place of, or in addition to, the data communication techniques described above.

FIG. 4 is a flowchart illustrating a method for determining parameters of a wind, photovoltaic and water energy storage multi-energy complementary system according to an exemplary embodiment. The wind-solar-water-storage multi-energy complementary system can be a wind-solar-water-storage multi-energy complementary system based on horizontal water pumping and energy storage as shown in figure 1 or figure 2. As shown in fig. 4, the method for determining parameters of the wind, light, water and energy storage multi-energy complementary system may include the following steps:

step 401, acquiring a wind-electricity-light total output value at each moment according to the wind power output condition of the wind power station at each moment and the light-electricity output condition of the photovoltaic power station at each moment.

In the field of new energy, photovoltaic power generation and wind power generation are extremely susceptible to environmental influences, and therefore, the photovoltaic power generation and the wind power generation are poor in power generation stability and are susceptible to wind power and light intensity changes. For example, for photovoltaic power generation, the illumination intensity in summer is high, and the illumination intensity in winter is low, so the output condition of the photovoltaic power station in summer months is obviously better than that in winter.

In order to determine the unstable condition of wind power and photoelectric power generation in the wind, light and water energy storage multi-energy complementary system, the wind power output condition of the wind power station at each moment and the photoelectric output condition of the photovoltaic power station at each moment can be obtained, and the wind power output condition and the photoelectric output condition are added according to time to obtain the wind and photoelectric total output value respectively corresponding to each moment.

Alternatively, the respective times may be 24 hours of a typical day.

And step 402, determining the maximum value in the total wind, photovoltaic and electric output values at all the moments as the initial total system output value of the wind, photovoltaic and water storage multi-energy complementary system.

Because the horizontal pumped storage power station is used for stabilizing wind, light and water storage multi-energy complementary system, in order to obtain the stable output value (the total output value of the wind, light and water storage multi-energy complementary system) of the wind, light and water storage multi-energy complementary system, after the wind, light and electricity total output value at each moment is obtained, the maximum value in the wind, light and electricity total output value at each moment can be firstly determined as the initial system total output value of the wind, light and water storage multi-energy complementary system, and then the total output value of the wind, light and water storage multi-energy complementary system is updated according to the subsequent calculation.

And 403, acquiring a hydropower compensation output value of the horizontal pumped storage power station according to the initial system total output value, and iteratively updating the hydropower station operation parameter according to the relationship between the hydropower compensation output and the hydropower guaranteed output so as to obtain the updated hydropower station operation parameter.

Wherein the hydroelectric guaranteed output is used for indicating the minimum output of a hydroelectric generating set in the horizontal pumped storage power station.

Optionally, when the total output value of the wind, photovoltaic and water storage multi-energy complementary system and the total wind, photovoltaic and electric output value are determined, the hydroelectric compensation output value of the horizontal pumped-storage power station at each moment can be determined, that is, it is determined how much hydroelectric power the horizontal pumped-storage power station needs to generate at each moment respectively to stabilize the power output of the wind, photovoltaic and water storage multi-energy complementary system.

And when the minimum value of the compensated output is smaller than the guaranteed output of the hydropower station, increasing the hydropower compensation output value in the whole time period to enable the minimum value of the compensated output to be equal to the guaranteed output of the hydropower station, and increasing the increased value of the compensated output to the total output value of the wind, light, water and energy storage multi-energy complementary system.

In the iteration process, when the total output value of the wind, light and water energy storage multi-energy complementary system is smaller than the maximum value of the wind, light and electricity output process, at least one moment exists in the wind, light and electricity at the moment, the wind, light and electricity output value at the moment is higher than the total output value of the wind, light and water energy storage multi-energy complementary system, in order to avoid waste of the excess wind, light and electricity, the excess wind and electricity can be converted into potential energy of water through the water pumping and energy storage process of the pump unit, and therefore abandonment of the wind, light and electricity is avoided as far as possible.

In the embodiment of the application, the parameters of the wind, light, water and energy storage multi-energy complementary system comprise hydropower station operation parameters and a total output value of the system. For preset photovoltaic power stations and wind power stations, a horizontal pumped storage power station can be constructed through hydropower station operation parameters obtained by the embodiment of the application, so that the wind power stations and the photovoltaic power stations can jointly form a wind-light-water-storage multi-energy complementary system with a stable system total output value.

FIG. 4 is a flowchart illustrating a method for determining parameters of a wind, photovoltaic and water energy storage multi-energy complementary system according to an exemplary embodiment. The wind-solar-water-storage multi-energy complementary system can be a wind-solar-water-storage multi-energy complementary system based on horizontal water pumping and energy storage as shown in fig. 2. As shown in fig. 4, the method for determining parameters of the wind, light, water and energy storage multi-energy complementary system may include the following steps:

and step 501, carrying out weighted average processing on the installed capacity of the wind power station, the installed capacity of the photovoltaic power station and the average power generation amount of the hydroelectric generating set according to time information to obtain the maximum capacity of the power transmitting surface.

For example, the method of calculating the maximum capacity of the power delivery surface may be represented by the following formula (1):

in the formula: n is a radical of _max Is the capacity of the power delivery cross section,

is the output coefficient of regional wind power in i month, beta _i Is the output coefficient of photovoltaic power in i month, N _max,wp For installed capacity of the system wind, N _pv In order to obtain the photovoltaic installed capacity,

is the average power generation amount of hydropower in month i,

the efficiency of the design and utilization of the delivery section is improved.

And 502, acquiring a wind-electricity-light total output value at each moment according to the wind power output condition of the wind power station at each moment and the light-electricity output condition of the photovoltaic power station at each moment.

In a possible implementation manner, the maximum wind power value of the wind power station and the wind power coefficient of the wind power station at each moment are obtained; acquiring a wind power output value of the wind power station at each moment according to the maximum wind power value of the wind power station and the wind power coefficient of the wind power station at each moment; the wind power output value at each moment is used for reflecting the wind power output condition at each moment.

In a possible implementation manner, acquiring the maximum photoelectric value of the photovoltaic power station and the photoelectric coefficient of the photovoltaic power station at each moment; acquiring a photovoltaic output value of the photovoltaic power station at each moment according to the maximum photoelectric value of the photovoltaic power station and the photoelectric coefficient of the photovoltaic power station at each moment; the photovoltaic output value at each moment is used for reflecting the photovoltaic output condition at each moment.

When the wind power output condition of the wind power station at each moment and the photoelectric output condition of the photovoltaic power station at each moment need to be obtained, the output coefficients (namely the photoelectric coefficient and the wind power coefficient) of the photovoltaic power station and the wind power station corresponding to each moment can be obtained, the output coefficients are used for indicating the operation efficiency of the photovoltaic power station and the wind power station at each moment, and the output conditions of the photovoltaic power station and the wind power station at each moment can be determined according to the operation efficiency and the maximum output value of each power station.

For example, the wind-photovoltaic total output value at each time can be calculated by the following formula (2):

N _i,w+p ＝a _i N _max,wp +b _i N _max,pv (2)

in the formula N _i,w+p For the process of wind-solar combined output in the period i, a _i Is a characteristic value of the wind power solar output in the period of i time, b _i The solar output characteristic value of the photovoltaic power in the i period is shown.

Maximum and minimum values of total output process of typical solar photovoltaic

When the process of the wind-light combined output in the i period is obtained, the combined output value of the wind-light at each moment (time period) can be determined.

Step 503, determining the maximum value in the total wind, photovoltaic and electric output values at each moment as the initial system total output value of the wind, photovoltaic, water and energy storage complementary system.

And step 504, acquiring a hydropower compensation output value of the horizontal pumped storage power station according to the initial system total output value, and iteratively updating the hydropower station operation parameter according to the relationship between the hydropower compensation output and the hydropower guarantee output so as to obtain the updated hydropower station operation parameter.

The hydropower station operation parameters comprise a hydropower compensation output value and a pumping power value; the hydropower compensation output value is used for indicating the output process of a hydroelectric generating set of the horizontal pumped storage power station; the pumping power value is used for indicating the pumping energy storage process of the pump unit.

Determining the hydroelectric compensation output value and the pumping power value according to the relation between the initial system total output value and the wind-solar-electricity total output value; and updating the initial system total output value according to the mean value of the hydroelectric compensation output values at all the moments and the difference value of the guaranteed output of the hydroelectric power, so as to determine a new hydroelectric compensation output value and a new pumping power value according to the updated system total output value.

Before the pumping power value is determined, the installed capacity of the pump unit corresponding to the pumping power value needs to be determined in advance, and in order to consider economic benefits, the rated power value of the pump unit needs to be reduced as much as possible on the premise that the pump unit has enough power and can normally convert the abandoned electric quantity into potential energy of water, so that the resource consumption for deploying the pump unit is reduced.

Thus, in the iterative process of the hydropower station operating parameter described above, three iterative sub-steps may actually be included as follows:

iteration step 1: determining the installed capacity of a pump station unit;

and (3) iteration step 2: calculating the water-electricity compensation output;

and (3) iteration step: and updating the output of the hydropower station.

In one possible implementation, the iteration step 1 may include the following steps:

acquiring preset installed capacity of a pump unit; and determining the pumping power value at each moment according to the relation between the difference between the total output value of the initial system and the installed capacity of the pump unit and the wind-solar-electricity total output value at each moment.

For example, when a preset pump unit installed capacity is acquired, a difference between the initial system total output value and the pump unit installed capacity may be determined. The total output value of the initial system can be regarded as the total output value of the wind-solar-water storage multi-energy complementary system, and the difference value between the total output value of the initial system and the installed capacity of the pump unit can be regarded as the minimum output value of the wind-solar-water storage multi-energy complementary system; when the minimum output value of the wind-light-water-storage multi-energy complementary system is larger than the wind-light-electricity total output value at the moment, the wind-light-electricity total output value at the moment cannot meet the wind-light-water-storage multi-energy complementary system, hydroelectric power output needs to be performed through the hydroelectric generating set at the moment, obviously, when the hydroelectric generating set is needed for supplementary power generation, no electric quantity is abandoned in the wind-light-water-storage multi-energy complementary system, and therefore the water pumping power value of the pump set at the moment is set to be 0.

When the minimum output value of the wind, light and water storage multi-energy complementary system is smaller than the wind, light and electricity total output value at the moment, the wind, light and electricity total output value is indicated, on the premise that the wind, light and water storage multi-energy complementary system is met, electric quantity possibly overflows, and the overflowing part (namely the difference between the wind, light and electricity total output value and the minimum output value of the wind, light and water storage multi-energy complementary system) can be used as the water pumping power value of the pump unit at the moment.

After the pumping power values at all times are determined, the ratio between the average value of the pumping power values at all times and the installed capacity of the pump unit can be determined again to serve as the utilization efficiency of the pump unit; and when the utilization efficiency of the pump unit is smaller than the efficiency threshold, reducing the installed capacity of the pump unit, and repeating the calculation process of the pumping power value until the installed capacity of the pump unit, which enables the utilization efficiency of the pump unit to be larger than the efficiency threshold, is obtained.

For example, the above iteration step 1 can be represented by the following formula (3):

phi in the formula is the utilization efficiency of the pump station, N _max,pp For the installed capacity of the pump unit, N _i,pp For the pump pumping power value at each time instant (i.e. M time instants),

is the initial system total output value, N _i,w+p Is the wind-light-electricity total output value.

In the formula, the computer equipment can determine the pumping power value at each moment according to the predetermined installed capacity of the pump machine; and determining the utilization efficiency of the pump unit according to the pumping power value at each moment. And when the utilization efficiency does not meet the condition, correcting the capacity of the pump machine assembling machine, and determining the water pumping power value at each moment again until the utilization efficiency of the pump machine set meets the requirement.

After the installed capacity of the pump motor unit is obtained, the peak part in the wind-solar water output value can be erased from the installed capacity of the pump motor unit, and then the hydroelectric compensation output value is determined.

I.e. the above iteration step 2 may comprise the following steps.

In one possible implementation manner, the hydraulic compensation output value is determined according to the relation between the difference between the initial system total output value and the installed capacity of the pump machine set and the wind-solar-electricity total output value.

That is, the above iteration step 2 can be expressed by the following formula (4):

wherein

Compensating the output value for hydropower, N _max,pp For the installed capacity of the pump unit, N _i,pp For the pump pumping power value at each time instant (i.e. M time instants),

After the installed capacity of the pump unit obtained by iterative updating in the process of determining the pumping power value is obtained, the difference value between the total output value of the initial system and the installed capacity of the pump unit can be determined. The total output value of the initial system can be regarded as the total output value of the wind, light, water and energy storage multi-energy complementary system, and the difference value between the total output value of the initial system and the installed capacity of the pump unit can be regarded as the minimum output value of the wind, light, water and energy storage multi-energy complementary system. When the minimum output value of the wind-light-water-storage multi-energy complementary system is larger than the wind-light-electricity total output value at the moment, the wind-light-electricity total output value at the moment cannot meet the wind-light-water-storage multi-energy complementary system, and the hydroelectric power output needs to be carried out through a hydroelectric generating set at the moment. Therefore, the difference between the minimum output value of the wind, light and water energy storage multi-energy complementary system and the wind, light and electricity total output value can be used as the output value of the hydroelectric generating set (namely the hydroelectric compensation output value).

In a possible implementation manner, the iteration step 3 may include the following steps, when the hydroelectric compensation output at each time is obtained, the minimum value of the hydroelectric compensation output may be obtained and compared with the minimum output (i.e., the hydroelectric guaranteed output) of the hydropower station, and when the minimum value of the hydroelectric compensation output is smaller than the hydroelectric guaranteed output, the difference between the minimum value of the hydroelectric compensation output and the hydroelectric guaranteed output is added to the hydroelectric compensation output and the initial system total output at each time, so as to update the hydroelectric compensation output and the initial system total output.

After the initial system total output value is updated, the iteration steps 1 to 3 can be repeated according to the updated system total output value, so as to realize the iterative update of each system parameter in the complementary system.

And 505, accumulating the wind and light output value and the hydroelectric compensation output value to obtain the wind and light output value.

When the hydroelectric compensation output value is obtained through the iteration steps, the wind and light output value and the hydroelectric compensation output value can be accumulated to obtain a total output value (namely the wind and light output value) of each power station in the wind, light and water storage multi-energy complementary system in the embodiment of the application.

And step 506, comparing the wind-solar-water output value, the updated system total output value and the maximum capacity of the power transmitting surface to obtain the electric power abandon amount of the wind-solar-water energy-storage multi-energy complementary system.

When the wind-solar-water output value, the updated system total output value and the maximum capacity of the power delivery surface are obtained, the wind-solar-water output value, the updated system total output value and the maximum capacity of the power delivery surface can be compared to obtain a difference between the wind-solar-water output value and the updated system total output value (namely, an output value representing that the hydropower station cannot coordinate) and a difference between the wind-solar-water output value and the maximum capacity of the power delivery surface (an output value representing that the maximum capacity of the power delivery surface cannot bear), and the minimum value between the wind-solar-water output value and the updated system total output value is determined as the electric power abandon amount of the wind-solar-water energy-storage and-storage complementary system at each moment. And accumulating the electric energy abandon at each moment to obtain the electric energy abandon of the wind, light, water and energy storage multi-energy complementary system at a certain moment.

And step 507, determining the lower pool capacity of the lower pool of the pump according to the pumping power value of the pump unit at each moment.

When the pumping power value of the pump set at each moment is determined, the pumping power of the pump set can be determined according to the pumping power value at each moment, the pumping amount of the pump at each moment can be determined through the rated lift of the pump set, and the pumping amounts of the pump at each moment are accumulated to obtain the lower pond capacity.

The pump set is characterized in that the rated lift of a water pump of the pump set is preset, and the pump set has the preset rated lift.

For example, the lower pool capacity can be calculated by the following formula:

in the formula: w _{Lower pool} Designing the storage capacity for the lower pond, wherein eta is the efficiency of the water pump and is generally 0.8, H is the rated lift of the water pump, K is a margin coefficient and is generally 1.05 to 1.2, delta T is the number of minutes in a period, T is the total number of time segments, and P is _t The pumping power of the pump is the time period t.

And step 508, according to the lower tank capacity, corresponding lower tank parameters of each component of the pump lower tank.

In one possible implementation, the pump lower pool comprises a water inlet gate, a water outlet gate and a barrage; the water inlet gate is used for introducing water in a river channel into the lower pump pool; the water outlet gate is used for returning water in the lower pool of the pump machine to a natural river channel when the water level in the lower pool of the pump machine is higher than a threshold value; the barrage is used for separating the lower pool of the pump from the river channel;

the lower pond parameters comprise at least one of a diversion gate bottom elevation, a diversion gate width, a diversion gate top elevation, a lower pond water diversion port elevation, a lower pond length and a lower pond-bank distance.

In one possible implementation, the sluice gate width may be preset, for example, the sluice gate width may be set to 10 m.

Optionally, the elevation of the bottom of the diversion gate can be the same as the elevation of the top of the diversion gate.

Acquiring a preset diversion gate top elevation, determining a diversion gate bottom elevation according to the preset diversion gate top elevation, and determining a lower pool water replenishing amount in a river channel according to the diversion gate bottom elevation, the diversion gate width and the diversion gate top elevation; and according to the difference between the water replenishing quantity of the lower pool and the capacity of the lower pool, iteratively updating the elevation of the top of the sluice gate of the diversion sluice until the water replenishing quantity of the lower pool is greater than the capacity of the lower pool, and the difference between the water replenishing quantity of the lower pool and the capacity of the lower pool is less than a threshold value.

After the lower pool capacity is determined, the appropriate lower pool water inlet elevation, lower pool length and lower pool bank distance can be determined, so that the requirement of the lower pool capacity can be met according to a lower pool formed by the lower pool water inlet elevation, the lower pool length and the lower pool bank distance.

For example, the respective tank descending parameters of the components of the pump tank can be calculated by the following steps.

Step 1, firstly determining characteristic parameters of a diversion gate, and specifically comprising the following steps: elevation of gate bottom, gate width and gate top

The gate width is generally considered to be 10m, and the gate width can be adjusted according to actual conditions, and the gate bottom elevation is determined as follows.

The first substep: assuming height H of brake top _gate The accumulated water supply W is calculated _{Supplement device} ：

In the formula: c _d The flow coefficient is typically 0.57 under free outflow conditions. Δ H _t And taking 0 when the tail water level of the hydropower station is lower than the elevation of the gate top, wherein l is the width of the gate.

And a second substep: comparative W _{Supplement device} And W _{Lower pool} When W is _{Supplement device} Is less than W _{Lower pool} When properly raising H _gate Repeating substeps one, e.g. W _{Supplement device} Is greater than W _{Lower pool} When appropriate, H is lowered _gate Repeating substep one until W _{Supplement device} Is slightly larger than W _{Lower pool} Until now.

Step 2, determining the elevation of the diversion port of the lower pool, the length of the lower pool and the distance between the lower pool and the bank

According to the large section condition of the river channel where the lower pool water diversion gate is located, the lower pool bank distance and the water diversion port elevation are preliminarily determined.

The following pool length is calculated according to the following formula:

in the formula: l is the length of the lower tankAnd Bp is the distance between the lower pond barrage and the bank. H _{Water intake} Is the elevation of the water inlet of the pump.

The existing wind-light-water complementary system is limited by the regulation capability of hydropower, and when the ratio of photovoltaic to wind power in the system is increased and exceeds the regulation capability of a hydropower station, a large amount of wind and light abandon still exists. In order to improve the wind-light-water complementary system compensation and regulation capacity for wind and light electricity, on the basis of the existing cascade hydropower station, the existing hydropower station is upgraded into a horizontal pumped storage power station by additionally arranging a water pump, and the regulation and storage capacity of water and electricity is improved by the way, so that the development scale of wind-light energy of the wind-light-water complementary system is improved, and the development and utilization rate of clean energy is effectively improved.

FIG. 6 is a schematic diagram illustrating a method for calculating engineering parameters of a wind, light, water and energy storage multi-energy complementary system according to an exemplary embodiment. The wind, light, water and energy storage multi-energy complementary system can be the wind, light, water and energy storage multi-energy complementary system in the embodiment shown in fig. 1 or the wind, light, water and energy storage multi-energy complementary system in the embodiment shown in fig. 2. The calculation mode of the main engineering parameters of the wind, light, water and energy storage multi-energy complementary system can comprise the following steps.

S601, calculating the maximum capacity of the power delivery section, wherein the formula is as follows:

is the output system of regional wind power in month i, beta _i Is the output coefficient of photovoltaic power in i month, N _max,wp For installed capacity of the system wind, N _pv The photovoltaic installed capacity is obtained by the following steps,

is the average power generation amount of hydropower in month i,

the efficiency of the design and utilization of the outward conveying section is improved.

S602, calculating the total output process of the typical solar wind photovoltaic, wherein the calculation formula is as follows:

N _i,w+p ＝a _i N _max,wp +b _i N _max,pv (2)

in the formula N _i,w+p For the process of wind-solar combined output in the period i, a _i Is a characteristic value of the wind power solar output in the period of i time, b _i And the solar output characteristic value of the photovoltaic power at the i time period is obtained.

S603: determining total output of complementary systems

And taking the maximum value of the total output process of wind, light and electricity as an initial value.

S604: determining installed capacity of pump station unit

And determining the installed capacity of the pump station by adopting a load shedding method and combining the installed utilization rate requirement (such as 20-30%) of the pump station unit according to the maximum compensation electric quantity of the hydropower. The pump station utilization efficiency calculation formula is as follows:

phi in the formula is the utilization efficiency of the pump station, N _max,pp Installed capacity for pump engine units, N _i,pp For the pumping power value of the pump at each moment (namely M moments),

S605: calculating the water-electricity compensation output according to the following formula

In the formula

And compensating the output for the water and electricity.

S606: and (6) calculating the output of the hydropower station.

Comparing the relation between the average compensated output of the hydropower station and the minimum output of the guaranteed output of the hydropower station, if the average compensated output of the hydropower station is smaller than the guaranteed output of the hydropower station, adding the difference part to the compensated output of the hydropower station, namely the output of the hydropower station, and simultaneously adding the difference to the total output of the complementary system determined in the step three; and if the average hydroelectric compensation output is larger than the guaranteed output of the hydropower, reducing the difference to the total output of the complementary system determined in the step three, and skipping to the step three.

S607: and calculating the electricity abandonment amount.

And adding the wind-light output process determined in the step two and the hydropower station output process determined in the step five to obtain a wind-light-water total output process, comparing the total output process with the maximum capacity of the power output section calculated in the step one and the minimum value of the total output of the complementary system determined in the step three, and accumulating the difference part to obtain the wind-light-water electricity discard quantity of the system.

In the actual planning of the wind-light-water-storage multi-energy complementary system based on horizontal water pumping and energy storage, the engineering parameters of the system can be compared according to the method, and the optimal scheme is preferably selected.

After the engineering parameters of the horizontal pumped storage power station system are obtained, the design parameters of the lower pool of the pump of the horizontal pumped storage power station can be determined according to the engineering parameters. This pond under pump includes: barrage, water inlet gate, and water outlet gate. The lower pool mainly provides a lower reservoir for regulation and storage for a water pump of a horizontal pumped storage power station, and the surplus water after ecological lower drainage quantity is continuously deducted in the lower pool during the power generation period of the hydropower station so as to provide sufficient water pumping quantity during the operation period of the water pump.

A barrage: the method is characterized in that a dam which separates a lower pool from a natural river channel is built on the basis of the original natural river channel.

Water inlet brake: and a water inlet gate is arranged at the upstream of the barrage so as to introduce the surplus water generated by the hydropower station.

A water withdrawal gate: and a water return gate is arranged at the downstream of the barrage, and when the water storage level of the lower pool exceeds the designed operation water level due to the pump failure and other reasons, the water return gate is started to return water to the natural river channel.

The method for designing parameters of the under-pump pool of the water pump can comprise the following steps.

The method comprises the following steps: lower pool storage capacity determination

And determining the required storage capacity of the lower pool according to the pump installation scale and the typical daily operation mode of the horizontal pumped storage power station. The specific calculation formula is as follows:

in the formula: w _{Lower pool} Designing the storage capacity for the lower pond, wherein eta is the efficiency of the water pump and is generally 0.8, H is the rated lift of the water pump, K is a margin coefficient and is generally 1.05 to 1.2, delta T is the number of minutes in a period, T is the total number of time segments, and P is _t Pumping work of the pump for a time period tAnd (4) the ratio.

Step two: confirm the diversion gate characteristic parameter, specifically include: elevation of gate bottom, gate width and gate top

The first substep: assuming height H of brake top _gate The calculation of the daily accumulated water supplement W of the lower pond is carried out _{Supplement device} ：

And a second substep: comparative W _{Supplement device} And W _{Lower pool} When W is _{Supplement device} Is less than W _{Lower pool} When properly raising H _gate Repeating substeps one, e.g. W _{Supplement device} Greater than W _{Lower pool} While properly reducing H _gate Repeating substep one until W _{Supplement device} Is slightly larger than W _{Lower pool} Until now.

Step three: determining the elevation of the diversion port, the length and the distance between the lower pool and the bank

And preliminarily determining the distance between the lower pond and the bank and the elevation of the water diversion port according to the condition of the large section of the river channel where the lower pond water diversion gate is located.

The following pool length is calculated according to the following formula:

in the formula: l is the length of the lower pond, and Bp is the distance between the lower pond barrage and the bank. H _{Water intake} Is the elevation of the water inlet of the pump.

Taking a certain basin step hydropower station as an example, comparing engineering parameters of a traditional wind-light-water complementary system and the wind-light-water complementary system based on horizontal pumped storage provided by the application under the development situation of the certain basin step hydropower station according to the proportion of 1.5:1.5:1 of wind, light and water, and verifying the effect of the application as follows: basic conditions of the drainage basin internal gradient hydropower station and wind, light and water energy resources are as follows.

The installed capacity of the cascade water in the flow area is 1470 ten thousand kW. Fig. 7 shows a schematic diagram of a monthly average power generation process of hydroelectric power in a basin according to an embodiment of the present application.

As shown in fig. 7, the installed capacities of wind power and photovoltaic power stations are developed according to the ratio of 1.5:1.5:1 of wind, light and water, respectively: wind power 2205kW and photovoltaic 2205 kW.

Fig. 8 shows a schematic diagram of a wind-power and photovoltaic monthly-oriented output coefficient in a drainage basin according to an embodiment of the present application.

Fig. 9 shows a schematic diagram of characteristic hourly output values of wind power and photovoltaic power in a drainage basin according to an embodiment of the present application.

According to a traditional wind-light-water complementary development mode, namely, when main engineering parameters of the wind-light-water energy storage and energy storage complementary system based on horizontal water pumping and energy storage are calculated according to the application, the installed capacity of a pump station is set to be 0.

Fig. 10 is a schematic view of the usage of the outgoing channel according to the embodiment of the present application. As shown in fig. 10, according to the embodiment S601 of the present application, the capacity of the outgoing channel of the system is 2771 kW calculated according to the usage rate of 70% of the outgoing channel.

Fig. 11 is a schematic diagram of typical solar wind, photovoltaic power, hydroelectric power, and electric power curtailment according to S602 to S606. As shown in fig. 11, under the situation that the cascade hydropower station is developed according to the proportion of 1.5:1.5:1 of wind, light and water, the intermittence of wind, light and water output cannot be completely regulated by hydropower station, and the electricity abandoning phenomenon exists. The average daily output power is 1961.60 ten thousand kW, the average daily output power of wind power is 963.80 ten thousand kW, the average daily output power of photovoltaic is 597.20 thousand kW, the average daily output power of hydropower is 600 ten thousand kW, and the average energy curtailment electric quantity is 115.80 hundred million kWh, which accounts for 6.81% of the average total annual power generation quantity of the system.

According to the wind-light-water complementary utilization development mode calculation based on horizontal pumped storage provided by the embodiment of the application:

the outgoing channel capacity calculation is the same as for the scheme described above, i.e. 2771 kW.

And calculating typical solar wind, photoelectric output, hydroelectric output, pump station installed capacity, pumping power and electric quantity abandon according to the second step and the sixth step.

Fig. 12 is a schematic view illustrating a wind, light and water output process corresponding to horizontal pumped-storage according to an embodiment of the present application. As shown in fig. 12, under the situation that the cascade hydropower station develops according to the proportion of 1.5:1.5:1 of wind, light and water, the intermittence of wind and light output can be completely adjusted by a wind, light and water storage complementary utilization development mode based on horizontal water pumping and energy storage, and stable power can be output. The average daily output power is 2121.50 ten thousand kW, the average daily output power of wind power is 963.80 ten thousand kW, the average daily output power of photovoltaic power and the average daily output power of water and electricity are 600 ten thousand kW, and the average energy curtailment electric quantity is 115.80 hundred million kWh, which accounts for 6.81% of the average total annual energy generation quantity of the system.

The intermittent type nature of wind-light output can not be adjusted completely to water and electricity, has abandoned the electricity phenomenon. The typical daily average output is 1961.60 ten thousand kW, the wind power daily average output, the photovoltaic daily average output, the water and electricity daily average output are 688 ten thousand kW, the rated power of a pump station is 380 ten thousand KW, the average utilization rate is 29 percent, and the system has no energy waste.

Compared with a traditional wind-light-water complementary development and utilization mode and a horizontal pumped storage-based wind-light-water storage complementary development and utilization mode, the horizontal pumped storage-based wind-light-water storage complementary development and utilization mode can enhance the adjusting capacity of the system for wind-light energy sources by additionally arranging the water pumping pump station, and under the development scene of the proportion of the wind-light-water-electricity to 1.5:1.5:1, the water abandoning capacity of the system is reduced by 6.81% compared with that of the traditional model, and the main reason is that the system converts the water abandoning capacity into water-electricity energy according to the conversion proportion of 80% through the water pump unit, so that the daily average output of the water-electricity of the horizontal pumped storage-based wind-water storage complementary development and utilization mode is increased by 88 thousands kW compared with that of the traditional mode.

For a certain hydropower station (horizontal pumped storage power station) in the current domain, the lower pool of the horizontal pumped storage power station is designed according to the method of the application, and the economic benefits are compared.

Fig. 13 shows a typical daily power generation and pumping process diagram of a pumped-storage power station according to an embodiment of the present application. As shown in fig. 13, the horizontal pumped-storage power station has 330 ten thousand kW of hydroelectric power installation and 86 ten thousand kW of pumping power installation.

According to the method for determining the lower pool storage capacity, the lower pool capacity is determined as follows: 747.14 km in ten thousand ³ 。

According to the method for determining the characteristic parameters of the water inlet gate, the characteristic parameters of the water inlet gate are determined as follows:

fig. 14 is a diagram illustrating a result of operating condition adjustment according to an embodiment of the present application. As shown in FIG. 14, when the gate width is initially set to 10m and the height of the top of the gate is set to 1013.5m according to the method of the embodiment of the present application, the total amount of water which can be supplied to the lower pool in the power generation period of the hydropower station is 781.40 km ³ And simultaneously, when the power generation and water supplement are carried out to the lower pool, the pump is in a stop state.

According to the method for determining the lower pool parameters, the lower pool engineering design parameters are determined as follows:

fig. 15 shows a schematic diagram of the engineering design parameters of the lower pool according to the embodiment of the present application, and as shown in fig. 15, when the bank distance is preliminarily determined to be about 30m according to the data of the large section where the water inlet gate is located, the river flood can be performed without being affected, and by using the calculation formula provided by the present application, the length and the depth of the lower pool are comprehensively considered, and the depth of the lower pool is determined to be 10m, and the length of the lower pool is determined to be 25.0 km.

Compare with traditional pumped storage power station design pattern, the pumped storage power station "lower pond" that this application provided can accomplish "lower pond" construction through building river dike and dam based on current river course, saves greatly than traditional pumped storage power station in the aspect of the building engineering expense.

The traditional pumped storage power station construction project expense is calculated as follows:

the total pumped storage investment is calculated according to 5500 yuan/kW, and the construction engineering cost of the embodiment is about 14.88 billion yuan according to the traditional pumped storage mode.

The construction engineering cost is calculated by the design method of 'leaving the pool' provided by the application as follows:

the river dam is calculated according to 400 ten thousand yuan/km, and the construction cost of a 'lower pool' is 1.25 hundred million yuan according to the 'lower pool' design method provided by the method.

In addition, the design method of the lower pool does not require land collection and migration, and further saves 15% of cost (the construction land collection and migration engineering cost is calculated according to 15% of the total pumped storage investment cost) compared with the traditional pumped storage power station, and in the embodiment, the migration and land collection cost is reduced by 6.6 million yuan.

In summary, the pumped storage power station 'lower pool' design method provided by the application is 43% lower than the traditional pumped storage design method in the total cost.

In addition, the lower reservoir of the pumped storage power station lower reservoir design method is just below the hydroelectric power station dam, and the pumping efficiency loss of the pump is extremely small. The application provides a design method of a lower pool of a pumped storage power station, wherein an upper pool is based on the existing hydropower station, the peak clipping capacity of the upper pool to a power grid is larger than that of a traditional pumped storage power station, in the embodiment, the peak hydropower output can reach 330 ten thousand kW, and the peak output of the traditional pumped storage power station is 86 ten thousand kW. The traditional pumped storage power station has high requirements on site selection of an upper reservoir and a lower reservoir, various factors such as terrain, economy and the like need to be considered, and large-scale popularization is difficult.

In addition, according to the scheme shown in the embodiment of the application, the energy storage cost of the pumped storage power station is effectively reduced, and the competitiveness of pumped storage is improved. The unit kWh cost of the traditional pumped storage energy storage mode is about 0.66 yuan (the following cost calculation is calculated according to the annual utilization hours 1400 h), the unit kWh cost of the compressed air energy storage is about 1.32 yuan, the unit kWh cost of the chemical battery (lead acid, sodium sulfur and liquid flow) energy storage is about 5-8 yuan, and the unit kWh cost of the chemical battery (lithium ion) energy storage is about 1.46 yuan. With the technical development, the international renewable energy organization predicts that the cost of the energy storage battery is reduced by 50% -70% by 2030 years, meanwhile, the service life and the charging times without serious loss are obviously improved, and the economic advantage of energy storage of the pumped storage power station is not obvious any more. The horizontal pumped storage power station provided by the project can reduce the cost by about 50% on the basis of the traditional pumped storage power station, and effectively improve the competitiveness of pumped storage energy storage.

The site selection requirement is low, and the energy storage scale is huge. The invention provides a design method of a lower pool of a pumped storage power station, wherein the upper pool is based on a reservoir of the existing hydropower station, the lower pool is based on a downstream natural river channel, the site selection is convenient, and ten thousands of reservoirs which can be popularized and applied nationwide are provided. The method provided by the invention can increase the pumped storage capacity of about 1/4 capacity of the hydropower installation, calculated according to 380GW of the national hydropower installation published by the national energy agency, 95GW of the national horizontal pumped storage theoretical installation, according to the 2020 hydropower status report issued by the International Water and Electricity Association (IHA), the total installed capacity of the global hydropower station reaches 1308GW, 327 of the global horizontal pumped storage theoretical installation is 2 times of the existing global total stored energy (2 months and 18 days as far as 2020, the installed scale of the global storage project is 191.15GW), and the energy storage scale is huge.

The proportion of hydroelectric power to wind power and photoelectric installation scale of a traditional wind-solar-water complementary operation system is 1:1, the wind-solar-water storage multi-energy complementary system based on horizontal water pumping and energy storage can be developed, the wind-solar-photoelectric installation scale can be enlarged to 1:3, and the installed capacity of regional wind and photoelectric can be greatly increased. By applying the wind-light-water multi-energy complementary system technology based on horizontal pumped storage, the regulation capability of the water-electricity to wind, the randomness of the photoelectricity and the intermittence is enhanced, and the wind and the light abandoned electricity are greatly reduced. According to 3.8 hundred million kW of national water and electricity installation, the wind, light and clean energy access capacity of 7.6 hundred million kW can be increased by adopting a horizontal pumping energy storage-based wind, light and water complementary development mode, according to 2082 (2089 years of national wind and electricity average utilization hours), 1169(2019 years of national photovoltaic average utilization hours) of annual installed utilization hours, the wind and light proportion in a wind and light complementary system is 1:1, the annual clean energy consumption scale is increased by 1.23 trillion kWh, and the emission of CO2 can be reduced by 0.99 million tons/year, which accounts for 1% of the total carbon emission of the national current situation.

Fig. 16 illustrates an apparatus for determining parameters of a wind, light, water and energy storage multi-energy complementary system according to an exemplary embodiment, the apparatus comprising:

the wind, photovoltaic and electric acquisition module 1601 is used for acquiring a wind, photovoltaic and electric total output value at each moment according to the wind power output condition of the wind power station at each moment and the photovoltaic output condition of the photovoltaic power station at each moment;

an initial value obtaining module 1602, configured to determine a maximum value of the total wind-photovoltaic output values at each time as an initial system total output value of the wind, photovoltaic and energy-storage multi-energy complementary system;

an iterative update module 1603, configured to obtain a hydropower compensation output value of the horizontal pumped-storage power station according to the initial system total output value, and iteratively update the operation parameters of the hydropower station according to a relationship between the hydropower compensation output and a hydropower guaranteed output so as to obtain updated operation parameters of the hydropower station; the hydropower guaranteed output is used for indicating the hydropower output of the horizontal pumped storage power station required by the complementary system;

the iterative update module comprises:

the hydropower parameter value acquisition module is used for determining the hydropower compensation output value and the pumping power value according to the relation between the initial system total output value and the wind-photovoltaic total output value;

In one possible implementation, the apparatus further includes:

the delivery capacity acquisition module is used for carrying out weighted average processing on the preset installed capacity of the wind power station, the preset installed capacity of the photovoltaic power station and the average power generation amount of the hydroelectric generating set according to time information to obtain the maximum capacity of a power delivery surface;

the wind-light-water output value acquisition module is used for accumulating the wind-light output value and the hydropower compensation output value to obtain a wind-light-water output value;

In one possible implementation, the horizontal pumped-hydro power storage plant further comprises a pump lower basin located downstream of the dam;

the device further comprises:

the lower pool capacity determining module is used for determining the lower pool capacity of the lower pool of the pump according to the installed capacity of the pump unit and the pumping power value of the pump unit at each moment;

Fig. 17 shows a block diagram of a computer device 1700 according to an exemplary embodiment of the present application. The computer device may be implemented as a server in the above-mentioned aspects of the present application. The computer apparatus 1700 includes a Central Processing Unit (CPU) 1701, a system Memory 1704 including a Random Access Memory (RAM) 1702 and a Read-Only Memory (ROM) 1703, and a system bus 1705 connecting the system Memory 1704 and the CPU 1701. The computer device 1700 also includes a mass storage device 1706 for storing an operating system 1709, application programs 1710, and other program modules 1711.

The mass storage device 1706 is connected to the central processing unit 1701 through a mass storage controller (not shown) connected to the system bus 1705. The mass storage device 1706 and its associated computer-readable media provide non-volatile storage for the computer device 1700. That is, the mass storage device 1706 may include a computer-readable medium (not shown) such as a hard disk or Compact disk-Only Memory (CD-ROM) drive.

Without loss of generality, the computer-readable media may comprise computer storage media and communication media. Computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes RAM, ROM, Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), flash Memory or other solid state Memory technology, CD-ROM, Digital Versatile Disks (DVD), or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage, or other magnetic storage devices. Of course, those skilled in the art will appreciate that the computer storage media is not limited to the foregoing. The system memory 1704 and mass storage device 1706 described above may be collectively referred to as memory.

The computer device 1700 may also operate as a remote computer connected to a network via a network, such as the internet, in accordance with various embodiments of the present disclosure. That is, the computer device 1700 may connect to the network 1708 through the network interface unit 1707 connected to the system bus 1705, or may connect to other types of networks or remote computer systems (not shown) using the network interface unit 1707.

The memory further includes at least one computer program stored in the memory, and the central processing unit 1701 implements all or part of the steps of the methods shown in the above-described embodiments by executing the at least one computer program.

In an exemplary embodiment, a computer readable storage medium is also provided for storing at least one computer program, which is loaded and executed by a processor to implement all or part of the steps of the above method. For example, the computer readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a Compact Disc Read-Only Memory (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, and the like.

In an exemplary embodiment, a computer program product or a computer program is also provided, which comprises computer instructions, which are stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions to cause the computer device to perform all or part of the steps of the method shown in any of the embodiments of fig. 4 or fig. 5.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A wind-light-water-storage multi-energy complementary system based on horizontal pumped storage is characterized in that the wind-light-water-storage multi-energy complementary system comprises a wind power station, a photovoltaic power station, a horizontal pumped storage power station and power station control equipment; the wind power station, the photovoltaic power station and the horizontal pumped storage power station are connected with one another through power lines;

the horizontal pumped storage power station comprises a hydroelectric generating set, a pump machine set and a pump machine lower pool; the hydroelectric generating set is used for conveying water at the upstream of the dam of the horizontal pumped storage power station to the downstream of the dam and generating corresponding hydroelectric power; the pump assembly is used for communicating the dam downstream with the dam upstream and delivering water from the dam downstream to the dam upstream when receiving power;

the power station control equipment is used for controlling at least one of the hydroelectric generating set and the pump machine set according to the wind power and the photoelectric power so as to adjust the total output value of the wind, light, water and energy storage multi-energy complementary system;

the parameters of the horizontal pumped storage power station can be obtained through the following steps:

acquiring a wind-electricity total output value at each moment according to the wind power output condition of the wind power station at each moment and the photoelectric output condition of the photovoltaic power station at each moment;

acquiring a hydroelectric compensation output value of the horizontal pumped storage power station according to the initial system total output value;

acquiring preset installed capacity of a pump unit; determining the pumping power value at each moment according to the relation between the difference between the total output value of the initial system and the installed capacity of the pump unit and the wind-solar-electricity total output value at each moment;

after the pumping power values at all times are determined, determining the ratio of the average value of the pumping power values at all times to the installed capacity of the pump unit as the utilization efficiency of the pump unit; when the utilization efficiency of the pump unit is smaller than an efficiency threshold, reducing the installed capacity of the pump unit, and repeating the calculation process of the pumping power value until the installed capacity of the pump unit, which enables the utilization efficiency of the pump unit to be larger than the efficiency threshold, is obtained;

determining a hydroelectric compensation output value according to the relation between the difference between the total output value of the initial system and the installed capacity of the pump-motor unit and the total wind-photovoltaic output value;

and when the hydropower compensation output at each moment is obtained, obtaining the minimum value of the hydropower compensation output, comparing the minimum value with the guaranteed output of the hydropower, and updating the hydropower compensation output and the total output of the initial system according to the comparison result.

2. The wind, photovoltaic, water and energy storage multi-energy complementary system of claim 1, wherein the under-pump pond is located downstream of a dam of the horizontal pumped-storage power station;

the lower pump pool comprises a water inlet gate, a water outlet gate and a barrage; the water inlet gate is used for introducing water in a river channel into the lower pool of the pump; the water outlet gate is used for returning water in the lower pump pool to a natural river channel when the water level in the lower pump pool is higher than a threshold value; the barrage is used for separating the lower pool of the pump from the river channel;

3. A method for determining parameters of a wind-light-water-storage multi-energy complementary system is characterized in that the wind-light-water-storage multi-energy complementary system comprises a wind power station, a photovoltaic power station, a horizontal pumped storage power station and power station control equipment; the wind power station, the photovoltaic power station and the horizontal pumped storage power station are connected with each other through power lines, and the method comprises the following steps:

determining the maximum value in the wind-light-electricity total output values at all the moments as an initial system total output value of the wind-light-water storage multi-energy complementary system;

acquiring a hydropower compensation output value of the horizontal pumped storage power station according to the initial system total output value, and iteratively updating hydropower station operation parameters according to the relationship between the hydropower compensation output and the hydropower guaranteed output so as to obtain updated hydropower station operation parameters; the hydropower guaranteed output is used for indicating the average hydropower output of a hydroelectric generator set in the horizontal pumped storage power station;

the power station control equipment indicates the output process of a hydroelectric generating set of the horizontal pumped storage power station and the pumped storage process of a pump generating set through the operation parameters of the hydroelectric generating station;

wherein, according to the relation between the water and electricity compensation power output and the water and electricity guarantee power output, the iterative update hydropower station operating parameter to obtain the updated hydropower station operating parameter includes:

determining a hydroelectric compensation output value according to the relationship between the difference between the total output value of the initial system and the installed capacity of the pump unit and the total wind-solar output value;

4. The method of claim 3, further comprising:

carrying out weighted average processing on the preset installed capacity of the wind power station, the preset installed capacity of the photovoltaic power station and the average power generation amount of the hydroelectric generating set according to time information to obtain the maximum capacity of a power transmitting surface;

accumulating the wind-photovoltaic total output value and the hydroelectric compensation output value to obtain a wind-photovoltaic-water output value;

and comparing the wind, light and water output value, the updated total system output value and the maximum capacity of the power delivery surface to obtain the electric power abandon amount of the wind, light and water energy storage and storage multi-energy complementary system.

5. The method of claim 4 wherein the horizontal pumped-hydro power storage plant further comprises an underpump sump located downstream of the dam;

the method further comprises the following steps:

determining the lower pool capacity of the lower pool of the pump according to the pumping power value of the pump set at each moment;

and determining the lower pool parameters respectively corresponding to each part of the lower pool of the pump according to the lower pool capacity.

6. The method of claim 5, wherein the underbump includes a water intake gate, a water return gate, and a barrage; the water inlet gate is used for introducing water in a river channel into the lower pool of the pump; the water outlet gate is used for returning water in the lower pump pool to a natural river channel when the water level in the lower pump pool is higher than a threshold value; the barrage is used for separating the lower pool of the pump from the river channel;

7. A parameter determination device for a wind-solar-water-storage multi-energy complementary system is characterized in that the wind-solar-water-storage multi-energy complementary system comprises a wind power station, a photovoltaic power station, a horizontal pumped storage power station and power station control equipment; the wind power station, the photovoltaic power station and the horizontal pumped storage power station are connected with each other through power lines, and the device comprises:

the wind-photovoltaic power acquisition module is used for acquiring a wind-photovoltaic total output value at each moment according to the wind power output condition of the wind power station at each moment and the photovoltaic output condition of the photovoltaic power station at each moment;

wherein the iterative update module is further configured to,

8. A computer device, characterized in that the computer device comprises a processor and a memory, wherein at least one instruction is stored in the memory, and the at least one instruction is loaded and executed by the processor to realize the method for determining the parameters of the wind, light, water and energy storage multi-energy complementary system according to any one of the claims 3 to 6.

9. A computer-readable storage medium, wherein at least one instruction is stored in the storage medium, and the at least one instruction is loaded and executed by a processor to implement the parameter determination method for the wind, photovoltaic and water storage multi-energy complementary system according to any one of claims 3 to 6.