Shared energy storage system, shared energy storage method and storage medium

Abstract

The invention provides a shared energy storage system and method and a storage medium. The shared energy storage system comprises a photovoltaic photo-thermal power generation heating module, an energy storage module, a heat pump module, a phase change heat storage type steam module, a heat storage water tank and a control device. The control device obtains various prediction data, and the power generation output power and the heat collection power of the photovoltaic photo-thermal power generation heating module are obtained through calculation according to the meteorological prediction data; electric energy obtaining time periods and electric energy obtaining power of the energy storage module, the heat pump module and the phase change heat storage type steam module are calculated according to the energy consumption cost function, and operation of the energy storage module, the heat pump module and the phase change heat storage type steam module is controlled according to the electric energy obtaining time periods and the electric energy obtaining power; the control device realizes operation control of the multiple energy storage devices by acquiring the multiple prediction data according to the multiple prediction data, the energy consumption cost function and the power demand of each energy storage device, further realizes high-efficiency energy conversion and scheduling of the multiple energy storage devices, and finally realizes high-efficiency operation of the shared energy storage system.

Description

Technical Field

[0001] The present invention relates to the field of electricity, and in particular to a shared energy storage system, a shared energy storage method, and a storage medium. Background Art

[0002] Shared energy storage is a new energy storage investment concept emerging from the rapid growth of the sharing economy. It has great potential for reducing investment costs, maximizing the benefits and value of energy storage, and facilitating user services. Compared to scenarios where users individually own energy storage devices, shared energy storage can significantly reduce user costs and improve device utilization.

[0003] Current shared energy storage systems primarily utilize batteries, a single form of energy storage that cannot meet the diverse energy needs of users. If a shared energy storage system incorporates multiple energy storage devices, the energy conversion and scheduling required for these devices will be inefficient, requiring multiple steps. This leads to lower operational efficiency for the shared energy storage system. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a shared energy storage system, a shared energy storage method and a storage medium, which can achieve high-efficiency operation of the shared energy storage system.

[0005] To achieve the above objectives, this application has the following technical solutions:

[0006] The present application provides a shared energy storage system, comprising: a photovoltaic thermal power generation and heating module, an energy storage module, a heat pump module, a phase change thermal storage steam module, a hot water storage tank, and a control device;

[0007] The photovoltaic thermal power generation and heating module is used to provide electrical energy to the power grid, energy storage module, heat pump module or phase change thermal storage steam module, and to provide thermal energy to the hot water storage tank, which is used to use the thermal energy to provide hot water to users;

[0008] The energy storage module is used to obtain electric energy from the photovoltaic thermal power generation and heating module or the power grid, and to provide electric energy to the heat pump module, the phase change thermal storage steam module and the user;

[0009] The heat pump module is used to use electrical energy to provide heat energy to the hot water storage tank;

[0010] The phase-change thermal storage steam module is used to provide steam to users using electrical energy;

[0011] The control device is used to obtain weather forecast data, user electricity load forecast data, user hot water load forecast data, user steam load forecast data and grid time-of-use electricity price data; the control device is used to calculate the power generation output power and heat collection power of the photovoltaic thermal power generation and heating module based on the weather forecast data;

[0012] The control device is used to calculate the power acquisition period and power of the energy storage module, the heat pump module and the phase-change thermal storage steam module according to the energy cost function, and the control device is used to control the operation of the energy storage module, the heat pump module and the phase-change thermal storage steam module according to the power acquisition period and the power;

[0013] The energy cost function is constructed using the grid time-of-use electricity price data, the grid offline power, the time-of-use electricity price data of the photovoltaic thermal power generation and heating module, and the photovoltaic online power of the photovoltaic thermal power generation and heating module; the grid offline power is related to the charging power of the energy storage module, the heating power of the phase change thermal storage steam module, the heat pump electric power, the user's electric load forecast data, and the power generation output power of the photovoltaic thermal power generation and heating module; the photovoltaic online power of the photovoltaic thermal power generation and heating module is related to the power generation output power of the photovoltaic thermal power generation and heating module and the grid offline power; the heat pump electric power is related to the user's hot water load forecast data and the heat collection power of the photovoltaic thermal power generation and heating module, and the user's steam load forecast data is related to the heating power of the phase change thermal storage steam module.

[0014] Optionally, the calculation objective of the energy cost function is to minimize the energy cost;

[0015] The control device is used to calculate the power acquisition period and power of the energy storage module, the heat pump module and the phase change thermal storage steam module according to the energy cost function with the lowest energy cost as the calculation target.

[0016] Optionally, the formula of the energy cost function with the lowest energy cost as the calculation goal is:

[0017] C=min(price ele ×P ele -price pv ×P pvup )×Δt

[0018] P ele =max(0,(P c +P ch +P HP +P other -P pv ))

[0019] P pvup =P pv -min(P pv ,(P c +P ch +P HP +P other ))

[0020] Among them, price ele Time-of-use electricity price data for the power grid, price pv is the time-of-use electricity price data of photovoltaic thermal power generation and heating modules, P ele Grid off-grid power, P pvup is the photovoltaic power grid-connected power of the photovoltaic thermal power generation module, Δt is the metering time period of the energy cost, P pv is the power output power of the photovoltaic thermal power generation module, P c is the charging power of the energy storage module, P ch is the charging power of the phase change thermal storage steam module, P HP is the heat pump electrical power, P other The total electric power of the user's electric load is the total electric power of the user's electric load, and the user's electric load prediction data includes the total electric power of the user's electric load.

[0021] Optionally, the calculation formula for the heat pump electric power is:

[0022] P HP =(Q hw -P pvheat ) / COP

[0023] Among them, Q hw is the user's hot water load forecast data, P pvheat is the heat collection power of the photovoltaic thermal power generation and heating module, and COP is the heating coefficient of the heat pump module.

[0024] Optionally, when the heat collection power of the photovoltaic thermal power generation module is greater than the user's hot water load forecast data, and the water temperature of the hot water storage tank is greater than the user's required water temperature, the heat pump module is not started;

[0025] When the heat collection power of the photovoltaic thermal power generation and heating module is less than the user's hot water load prediction data, the heat pump module is started.

[0026] Optionally, it further comprises: a first circulating hot water pipe, a first circulating water pump and a first stop valve;

[0027] The first circulating hot water pipe is used to connect the hot water storage tank and the heat pump module;

[0028] The first circulating water pump is used to provide power for hot water circulation in the first circulating hot water pipe;

[0029] The first stop valve is used to open or close the hot water circulation of the first circulating hot water pipe;

[0030] The opening or closing of the first circulating water pump and the first stop valve is synchronized with the opening or closing of the heat pump module.

[0031] Optionally, it further comprises: a second circulating hot water pipe, a second circulating water pump and a second stop valve;

[0032] The second circulating hot water pipe is used to connect the hot water storage tank and the photovoltaic thermal power generation and heating module;

[0033] The second circulating water pump is used to provide power for hot water circulation in the second circulating hot water pipe;

[0034] The second stop valve is used to open or close the hot water circulation of the second circulating hot water pipe.

[0035] Optionally, the weather forecast data includes solar panel temperature;

[0036] When the temperature of the solar panel is higher than the water temperature of the water storage tank, the second circulating water pump and the second shut-off valve are turned on, and the photovoltaic thermal power generation and heating module is used to provide heat energy for the water storage tank;

[0037] When the water inlet temperature is lower than the water outlet temperature when the water flows through the photovoltaic thermal power generation and heating module, the second circulating water pump and the second stop valve are closed.

[0038] The present application provides a shared energy storage method, which is applied to any of the above-mentioned shared energy storage systems, and the method includes:

[0039] Obtain weather forecast data, user electricity load forecast data, user hot water load forecast data, user steam load forecast data, and grid time-of-use electricity price data;

[0040] Calculating the power output power and heat collection power of the photovoltaic thermal power generation and heating module according to the meteorological forecast data;

[0041] Calculating the power acquisition period and power of the energy storage module, the heat pump module, and the phase-change thermal storage steam module according to the energy cost function, and controlling the operation of the energy storage module, the heat pump module, and the phase-change thermal storage steam module according to the power acquisition period and the power;

[0042] The energy cost function is constructed using the grid time-of-use electricity price data, the grid offline power, the time-of-use electricity price data of the photovoltaic thermal power generation and heating module, and the photovoltaic online power of the photovoltaic thermal power generation and heating module; the grid offline power is related to the charging power of the energy storage module, the heating power of the phase change thermal storage steam module, the heat pump electric power, the user's electric load forecast data, and the power generation output power of the photovoltaic thermal power generation and heating module; the photovoltaic online power of the photovoltaic thermal power generation and heating module is related to the power generation output power of the photovoltaic thermal power generation and heating module and the grid offline power; the heat pump electric power is related to the user's hot water load forecast data and the heat collection power of the photovoltaic thermal power generation and heating module, and the user's steam load forecast data is related to the heating power of the phase change thermal storage steam module.

[0043] The present application provides a computer storage medium for storing a computer program. When the computer program is run on a computer device, the computer device performs the method described above.

[0044] The present application provides a shared energy storage system, which includes: a photovoltaic thermal power generation and heating module, an energy storage module, a heat pump module, a phase change thermal storage steam module, a hot water storage tank and a control device; the photovoltaic thermal power generation and heating module is used to provide electrical energy to the power grid, the energy storage module, the heat pump module or the phase change thermal storage steam module, and to provide thermal energy to the hot water storage tank, and the hot water storage tank is used to use thermal energy to provide hot water to users; the energy storage module is used to obtain electrical energy from the photovoltaic thermal power generation and heating module or the power grid, and to provide electrical energy to the heat pump module, the phase change thermal storage steam module and the user; the heat pump module is used to use electrical energy to provide thermal energy to the hot water storage tank; the phase change thermal storage steam module is used to use Use electricity to provide steam to users, that is, photovoltaic thermal power generation and heating modules, energy storage modules, heat pump modules, phase change thermal storage steam modules and hot water storage tanks can be used to provide users with multiple energies such as electricity, hot water and steam, that is, the shared energy storage system includes multiple energy storage devices to meet the various energy needs of users; the control device is used to obtain weather forecast data, user electricity load forecast data, user hot water load forecast data, user steam load forecast data and grid time-of-use electricity price data; the control device is used to calculate the power generation output power and heat collection power of the photovoltaic thermal power generation and heating module according to the weather forecast data; the control device is used to calculate the power generation output power and heat collection power of the photovoltaic thermal power generation and heating module according to the energy cost function The electric energy acquisition period and electric energy acquisition power of the energy storage module, the heat pump module and the phase change thermal storage steam module are calculated, and the control device is used to control the operation of the energy storage module, the heat pump module and the phase change thermal storage steam module according to the electric energy acquisition period and the electric energy acquisition power; the energy cost function is constructed by using the time-of-use electricity price data of the power grid, the off-grid power of the power grid, the time-of-use electricity price data of the photovoltaic thermal power generation and heating module and the photovoltaic on-grid power of the photovoltaic thermal power generation and heating module; the off-grid power of the power grid and the charging power of the energy storage module, the charging power of the phase change thermal storage steam module, the heat pump power, the user's electric load forecast data and the power generation output power of the photovoltaic thermal power generation and heating module The power of the photovoltaic solar thermal power generation and heating module is related to the photovoltaic grid-connected power and the photovoltaic solar thermal power generation and heating module's power output, as well as the grid-offline power; the heat pump power is related to the user's hot water load forecast data and the thermal collection power of the photovoltaic solar thermal power generation and heating module, and the user's steam load forecast data is related to the charging power of the phase change thermal storage steam module. That is to say, the control device obtains a variety of forecast data, and controls the operation of a variety of energy storage devices according to the multiple forecast data, the energy cost function, and the power requirements of each energy storage device, thereby achieving high-efficiency energy conversion and scheduling of a variety of energy storage devices, and ultimately achieving high-efficiency operation of the shared energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 A schematic structural diagram of a shared energy storage system provided in an embodiment of the present application is shown;

[0047] Figure 2 A flow chart of a shared energy storage method provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0048] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0049] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0050] This application is described in detail in conjunction with schematic diagrams. When describing the embodiments of the present application in detail, for the sake of convenience, the schematic diagrams representing the system structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of this application.

[0051] Current shared energy storage systems use a single form of energy storage, often installing large numbers of batteries to store electricity. When users need energy, the batteries discharge the electricity and supply it externally. Installing a large number of batteries, however, requires a high initial investment. Whether building lithium-ion batteries, flow batteries, or other types of energy storage facilities, significant capital investment is required, including equipment purchase, installation, commissioning, and the construction of supporting facilities. These costs increase exponentially, especially when the scale of energy storage is large, making many projects impossible to implement due to high costs. If multiple energy storage devices are installed in a shared energy storage system, the energy conversion and scheduling of these multiple energy storage devices will require multiple steps, resulting in low efficiency in the multi-step energy conversion and scheduling process, leading to low operating efficiency of the shared energy storage system.

[0052] Based on this, the present application provides a shared energy storage system, which includes: a photovoltaic thermal power generation and heating module, an energy storage module, a heat pump module, a phase change thermal storage steam module, a hot water storage tank and a control device; the photovoltaic thermal power generation and heating module is used to provide electrical energy to the power grid, the energy storage module, the heat pump module or the phase change thermal storage steam module, and to provide thermal energy to the hot water storage tank, which is used to use thermal energy to provide hot water to users; the energy storage module is used to obtain electrical energy from the photovoltaic thermal power generation and heating module or the power grid, and to provide electrical energy to the heat pump module, the phase change thermal storage steam module and the user; the heat pump module is used to use electrical energy to provide thermal energy to the hot water storage tank; the phase change thermal storage steam module It is used to provide steam to users by using electric energy, that is, photovoltaic thermal power generation and heating modules, energy storage modules, heat pump modules, phase change thermal storage steam modules and hot water storage tanks can be used to provide users with multiple energies such as electricity, hot water and steam, that is, the shared energy storage system includes multiple energy storage devices, so as to meet the multiple energy needs of users; the control device is used to obtain weather forecast data, user electricity load forecast data, user hot water load forecast data, user steam load forecast data and grid time-of-use electricity price data; the control device is used to calculate the power generation output power and heat collection power of the photovoltaic thermal power generation and heating module according to the weather forecast data; the control device is used to calculate the power generation output power and heat collection power of the photovoltaic thermal power generation and heating module according to the energy cost This function calculates the energy storage module, heat pump module and phase change thermal storage steam module to obtain electricity during the period of time and the power of electricity. The control device is used to control the operation of the energy storage module, heat pump module and phase change thermal storage steam module according to the energy acquisition period and the power of electricity acquisition. The energy cost function is constructed by using the grid time-of-use electricity price data, the grid off-grid power, the time-of-use electricity price data of the photovoltaic thermal power generation and heating module and the photovoltaic on-grid power of the photovoltaic thermal power generation and heating module. The grid off-grid power and the charging power of the energy storage module, the charging power of the phase change thermal storage steam module, the heat pump power, the user's electricity load forecast data and the power generation output of the photovoltaic thermal power generation and heating module are used. Power is related; the photovoltaic grid-connected power of the photovoltaic thermal power generation and heating module is related to the power generation output power of the photovoltaic thermal power generation and heating module and the grid offline power; the heat pump electric power is related to the user's hot water load forecast data and the thermal collection power of the photovoltaic thermal power generation and heating module, and the user's steam load forecast data is related to the charging power of the phase change thermal storage steam module. That is to say, the control device obtains a variety of forecast data, and realizes operation control of a variety of energy storage devices according to a variety of forecast data, energy cost function and power requirements of each energy storage device, thereby realizing high-efficiency energy conversion and scheduling of a variety of energy storage devices, and finally realizing high-efficiency operation of the shared energy storage system.

[0053] In order to better understand the technical solutions and technical effects of the present application, specific embodiments will be described in detail below with reference to the accompanying drawings.

[0054] refer to Figure 1The figure shows a schematic diagram of the structure of a shared energy storage system provided in an embodiment of the present application. The shared energy storage system provided in an embodiment of the present application includes: a photovoltaic thermal power generation and heating module 110, an energy storage module 120, a heat pump module 130, a phase change thermal storage steam module 140, a hot water storage tank 150, and a control device 160.

[0055] The photovoltaic thermal power generation and heating module 110 is used to provide electrical energy to the power grid, energy storage module 120, heat pump module 130, and phase-change thermal storage steam module 140, as well as thermal energy to the hot water storage tank 150. The photovoltaic thermal power generation and heating module 110 is connected to the power grid and energy storage module 120 via cable 210. The heat pump module 130, phase-change thermal storage steam module 140, and multiple users can also be connected to the power grid via cable 210. The power required by the heat pump module 130, phase-change thermal storage steam module 140, and users can be transmitted via cable 210. The power source can be either the power grid or the photovoltaic thermal power generation and heating module 110.

[0056] The hot water storage tank 150 is used to utilize thermal energy to provide hot water to the user. Specifically, the hot water storage tank 150 is connected to the user through a hot water pipe 280 to provide hot water to the user.

[0057] In addition to providing electricity, photovoltaic thermal power generation and heating module 110 can also provide heat. It is used to generate electricity and collect heat. Utilizing integrated photovoltaic and thermal technology, it features flow channels on the back of the photovoltaic panels. The fluid within these channels collects waste heat from the photovoltaic thermal power generation and heating module 110 and stores it in a heat storage tank 150.

[0058] Specifically, the shared energy storage system also includes a second hot water circulation pipe 250, a second circulating water pump 260, and a second shutoff valve 270. The second hot water circulation pipe 250 connects the hot water storage tank 150 and the photovoltaic thermal power generation and heating module 110. The second circulating water pump 260 provides power for the hot water circulation in the second hot water circulation pipe 250. The second shutoff valve 270 opens or closes the hot water circulation in the second hot water circulation pipe 250.

[0059] As an example, when there is sufficient sunshine, the second circulating water pump 260 circulates the circulating water between the hot water storage tank 150 and the photovoltaic thermal power generation and heating module 110 to complete the heating of the water in the hot water storage tank 150.

[0060] The energy storage module 120 is used to obtain electric energy from the photovoltaic thermal power generation and heating module 110 or the power grid, and to provide electric energy to the heat pump module 130, the phase change thermal storage steam module 140 and the user. The energy storage module 120 is connected to the power grid and the photovoltaic thermal power generation and heating module 110 through a cable 210. It can be charged with the electric energy provided by the photovoltaic thermal power generation and heating module 110 or the valley electricity of the power grid, and discharged during the peak electricity price period to reduce the electricity operation cost. Specifically, the energy storage module 120 can be a battery. The valley electricity of the power grid is the electricity when the time-of-use electricity price of the power grid is the valley value, and the peak electricity of the power grid is the electricity when the time-of-use electricity price of the power grid is the peak value.

[0061] The heat pump module 130 is used to use electrical energy to provide heat energy to the hot water storage tank 150 .

[0062] In an embodiment of the present application, the shared energy storage system further includes a first circulating hot water pipe 220, a first circulating water pump 230, and a first shut-off valve 240. The first circulating hot water pipe 220 is used to connect the hot water storage tank 150 and the heat pump module 130. The first circulating water pump 230 is used to provide power for the hot water circulation in the first circulating hot water pipe 220. The first shut-off valve 240 is used to open or close the hot water circulation in the first circulating hot water pipe 220. In other words, the heat pump module 130 is connected to the hot water storage tank 150 via the first circulating hot water pipe 220. When the hot water storage tank 150 has insufficient heat storage, the heat pump module 130 uses a small amount of electrical energy to absorb heat from the air and heat the water circulation in the hot water storage tank 150 to a specified temperature. The first circulating water pump 230 provides power for the hot water circulation. For example, the heat pump module 130 may be an air source heat pump.

[0063] The phase-change thermal storage steam module 140 is used to use electrical energy to provide steam to users. The phase-change thermal storage steam module 140 is connected to the user via a steam pipe 290 to provide steam to the user. The phase-change thermal storage steam module 140 can use the electrical energy provided by the photovoltaic thermal power generation and heating module 110, the electrical energy provided by the energy storage module 120, or the valley electricity provided by the power grid to convert the electrical energy into thermal energy through the electric heating device included in the phase-change thermal storage steam module 140 and store it in the phase-change thermal storage body included in the phase-change thermal storage steam module 140. It can also simultaneously store heat and produce steam, which is supplied to the user via the steam pipe 290.

[0064] Soft water pipe 310 is used to provide hot water replenishment and steam generation water to the hot water storage tank 150 and the phase-change thermal storage steam module 140. During the heat release phase of the phase-change thermal storage steam module 140, soft water is introduced to generate steam from the stored heat, which is then supplied to the user via steam pipe 290.

[0065] In an embodiment of the present application, the shared energy storage system includes the following two operating modes.

[0066] The first operating mode is that when the current period belongs to valley electricity or the electricity provided by the photovoltaic thermal power generation and heating module 110, the energy storage module 120 stores electricity, and the phase change thermal storage steam module 140 stores heat. The photovoltaic thermal power generation and heating module 110 can use the waste heat of the photovoltaic panel to heat the water in the hot water storage tank 150. If the water temperature in the hot water storage tank 150 fails to reach the specified temperature, the heat pump module 130 will generate hot water to supply users or store it in the hot water storage tank 150.

[0067] In the second operating mode, when photovoltaic thermal power generation and heating module 110 is running low on power or electricity prices are at their peak, energy storage module 120 releases power. This power is used by energy conversion devices within the shared energy storage system, such as heat pump module 130 and circulating water pumps, and can also be used to provide electricity to users via the grid. Phase change thermal storage steam module 140 uses stored high temperature energy to provide steam, while heat pump module 130 uses the power provided by energy storage module 120 to generate heat and provide hot water.

[0068] To achieve efficient operation of the shared energy storage system, control device 160 can control the operation of the shared energy storage system's energy storage devices and energy conversion equipment. Control device 160 can also obtain weather forecast data, user electricity load forecast data, user hot water load forecast data, user steam load forecast data, and grid time-of-use electricity price data.

[0069] The control device 160 can calculate the power output power and heat collection power of the photovoltaic thermal power generation and heating module 110 based on the meteorological forecast data, and thus use the power output power and heat collection power to assist in the subsequent operation control of multiple energy storage devices. Based on the correlation between the heat pump power and the user's hot water load forecast data and the heat collection power of the photovoltaic thermal power generation and heating module 110, the user's steam load forecast data and the charging power of the phase change thermal storage steam module 140 are related, the grid off-grid power is related to the charging power of the energy storage module 120, the charging power of the phase change thermal storage steam module 140, the heat pump power, the user's electric load forecast data and the power output power of the photovoltaic thermal power generation and heating module 110, the photovoltaic on-grid power of the photovoltaic thermal power generation and heating module 110 is related to the power output power of the photovoltaic thermal power generation and heating module 110, and the grid The off-grid power is related, and the energy cost function can be constructed by using the time-of-use electricity price data of the grid, the off-grid power of the grid, the time-of-use electricity price data of the photovoltaic thermal power generation and heating module 110, and the photovoltaic on-grid power of the photovoltaic thermal power generation and heating module 110. The control device 160 can calculate the power acquisition period and power of the energy storage module 120, the heat pump module 130 and the phase change thermal storage steam module 140 according to the energy cost function, and then control the operation of the energy storage module 120, the heat pump module 130 and the phase change thermal storage steam module 140 according to the power acquisition period and the power.

[0070] That is to say, the control device 160 obtains multiple prediction data, and controls the operation of multiple energy storage devices according to the multiple prediction data, energy cost function and power requirements of each energy storage device, thereby achieving high-efficiency energy conversion and scheduling of multiple energy storage devices, and ultimately achieving high-efficiency operation of the shared energy storage system.

[0071] Taking into account the current demand for cost reduction of shared energy storage systems, the calculation target of the energy cost function can be set to minimize the energy cost. The control device 160 can calculate the power acquisition period and power of the energy storage module 120, the heat pump module 130 and the phase change thermal storage steam module 140 according to the energy cost function with the lowest energy cost as the calculation target.

[0072] Specifically, the formula of the energy cost function with the lowest energy cost as the calculation goal is:

[0073] C=min(price ele ×P ele -price pv ×P pvup )×Δt

[0074] P ele =max(0,(P c +P ch +P HP +P other -P pv ))

[0075] P pvup =P pv -min(P pv ,(P c +P ch +P HP +P other ))

[0076] Among them, price ele Time-of-use electricity price data for the power grid, price pv is the time-of-use electricity price data of the photovoltaic thermal power generation and heating module 110, P ele Grid off-grid power, P pvup is the photovoltaic power grid-connected power of the photovoltaic thermal power generation and heating module 110, Δt is the metering time period of the energy cost, P pv is the output power of photovoltaic thermal power generation module 110, P c is the charging power of the energy storage module 120, P ch is the charging power of the phase change thermal storage steam module 140, P HP is the heat pump electrical power, P otherThe total power of the user's load. The user's load forecast data includes the total power of the user's load. The unit of power is kW, and the unit of time-of-use electricity price is RMB / kWh.

[0077] As an example, a particle swarm algorithm may be used to calculate an energy cost function with the lowest energy cost as the calculation objective.

[0078] In an embodiment of the present application, the meteorological forecast data includes solar radiation intensity, solar panel temperature and ambient temperature, so the power generation output power and heat collection power of the photovoltaic thermal power generation and heating module 110 can be calculated based on the solar radiation intensity, solar panel temperature and ambient temperature.

[0079] Specifically, the formula for calculating the power output power and heat collection power of the photovoltaic thermal power generation and heating module 110 based on the solar radiation intensity, the panel temperature and the ambient temperature can be as follows.

[0080]

[0081] P pvheat (t) = G(t) × η pvheat

[0082] Among them, P pv (t) is the power output of the photovoltaic thermal power generation and heating module 110, in kW; P stc is the power output of the photovoltaic thermal power generation and heating module 110 under standard test conditions, in kW; G(t) is the solar radiation intensity at time t, in kW / m 2 ; G stc is the solar radiation intensity under standard test conditions (STC), with a value of 1kW / m 2 ; k is the temperature coefficient of the solar panel, which is about -0.3%; T c (t) is the panel temperature at time t, in °C; T stc is the temperature of the solar panel under standard test conditions, which is 25°C; T a (t) is the ambient temperature at time t, in °C; η pvheat It is the comprehensive heat collection efficiency of the photovoltaic thermal power generation and heating module 110.

[0083] The photovoltaic thermal power generation and heating module 110 can provide heat energy to the hot water storage tank 150 through the second circulating hot water pipe 250 controlled by the second circulating water pump 260 and the second shut-off valve 270. The operation of the second circulating water pump 260 and the second shut-off valve 270 is not involved in the calculation of the energy cost function. When the solar panel temperature is higher than the water temperature in the hot water storage tank 150, the second circulating water pump 260 and the second shut-off valve 270 are turned on, and the photovoltaic thermal power generation and heating module 110 provides heat energy to the hot water storage tank 150. When the inlet water temperature of the water flowing through the photovoltaic thermal power generation and heating module 110 is lower than the outlet water temperature, the second circulating water pump 260 and the second shut-off valve 270 are turned off. In other words, the start and stop of the second circulating water pump 260 and the opening and closing of the second shut-off valve 270 are not involved in the optimized scheduling of the shared energy storage system. The start and stop of the second circulating water pump 260 and the opening and closing of the second shut-off valve 270 are controlled solely by feedback from the inlet and outlet water temperatures and the solar panel temperature. When the inlet water temperature is not lower than the outlet water temperature, the second circulating water pump 260 and the second stop valve 270 are immediately closed; when the solar panel temperature is higher than the water temperature of the hot water storage tank 150, the second circulating water pump 260 is running.

[0084] In an embodiment of the present application, the heat pump module 130 can convert 3 to 5 times the amount of heat energy by consuming a certain amount of electrical energy. The operation of the heat pump module 130 is subject to linkage control constraints and is affected by the user's hot water load, the heat collection power of the photovoltaic thermal power generation and heating module 110, the remaining hot water in the hot water storage tank 150, and the water temperature of the hot water storage tank 150. When the heat collection power of the photovoltaic thermal power generation and heating module 110 is greater than the user's hot water load forecast data, and the water temperature of the hot water storage tank 150 is greater than the user's required water temperature, the heat pump module 130 will not start; when the heat collection power of the photovoltaic thermal power generation and heating module 110 is less than the user's hot water load forecast data, the heat pump module 130 will start.

[0085] As an example, the formula for the operation of the heat pump module 130 with linkage control constraints may be as follows.

[0086]

[0087] Among them, ST hp is the start / stop state of the heat pump module 130, T wx The water temperature required by the user, T w is the water temperature of the hot water tank 150, Q hw Provide hot water load forecast data for users.

[0088] In addition to the linkage control constraints on the operation of the heat pump module 130, the operation of the first circulating water pump 230 and the first stop valve 240 also have linkage control constraints. The opening or closing of the first circulating water pump 230 and the first stop valve 240 are synchronized with the opening or closing of the heat pump module 130. In other words, the operation of the first circulating water pump 230 and the opening and closing control of the first stop valve 240 are linked to the operation of the heat pump module 130. When the heat pump module 130 is operating, the first circulating water pump 230 and the first stop valve 240 are also operating.

[0089] In an embodiment of the present application, based on the fact that the energy storage module 120 is capable of charging and discharging, the charging power and charging time of the energy storage module 120 are controlled by an energy cost function, and the discharging power and discharge time of the energy storage module 120 are affected by the user's electricity load forecast data and time-of-use electricity price data. The charging and discharging of the energy storage module 120 have corresponding mathematical models, and the stored electricity amount of the energy storage module 120 can be calculated based on the user's electricity load forecast data and the discharge model, and then the charging power and charging time of the energy storage module 120 are calculated based on the stored electricity amount, the charging model, and the energy cost function.

[0090] Specifically, the energy storage module 120 uses its state of charge (SOC) to measure its stored capacity. The SOC is defined as the ratio of the remaining capacity of the energy storage module 120 to its rated capacity. The SOC of the energy storage module 120 at time t is related to three factors: the SOC at time (t-1), the charge and discharge capacity from time (t-1) to time t, and the self-discharge rate. This can be expressed using the following formula:

[0091] The state of charge of the energy storage module 120 at time t when discharging is:

[0092]

[0093] The state of charge of the energy storage module 120 at time t when charging:

[0094]

[0095] Where: SOC(t) is the state of charge of the energy storage module 120 at time t, in %; η is the self-discharge rate, in %; P d (t) is the discharge power of the energy storage module 120, in kW; η d is the discharge efficiency of the energy storage module 120, in %; Δt is the sampling step, in h; E r is the rated capacity of the energy storage module 120, in kWh; P c (t) is the charging power of the energy storage module 120, in kW; η c is the charging efficiency of the energy storage module 120, in %.

[0096] In an embodiment of the present application, based on the correlation between the heat pump power and the user's hot water load prediction data and the heat collection power of the photovoltaic thermal power generation and heating module 110, the calculation formula of the heat pump power can be as follows.

[0097] P HP =(Q hw -P pvheat ) / COP

[0098] Among them, Q hw is the user's hot water load forecast data, P pvheat is the heat collection power of the photovoltaic thermal power generation and heating module 110 , and COP is the heating coefficient of the heat pump module 130 .

[0099] In an embodiment of the present application, based on the fact that the phase-change thermal storage steam module 140 can charge and release heat, the charging power and charging time of the phase-change thermal storage steam module 140 are controlled by the energy cost function, and the heat release power and heat release time of the phase-change thermal storage steam module 140 are affected by the user's steam load forecast data. The charging and heat release of the phase-change thermal storage steam module 140 have corresponding mathematical models. The stored heat of the phase-change thermal storage steam module 140 can be calculated based on the phase-change thermal storage steam module 140 and the heat release model, and then the charging power and heat charging time of the phase-change thermal storage steam module 140 are calculated according to the stored heat, the heat charging model and the energy cost function.

[0100] Specifically, the phase-change thermal storage steam module 140 utilizes phase-change material as a thermal storage medium. An electric heater converts electrical energy into thermal energy, which is then stored within the thermal storage medium. When steam is needed, soft water is introduced to generate steam. The charging and discharging processes of the phase-change thermal storage steam module 140 are similar to those of the energy storage module 120 and can be represented by SOCH.

[0101] The remaining heat storage state at time t when the phase change thermal storage steam module 140 releases heat:

[0102]

[0103] The remaining heat storage state at time t when the phase change thermal storage steam module 140 is charged:

[0104]

[0105] Among them, η h is the heat loss rate, in %; P dh (t) is the heat release power of the phase change thermal storage steam module 140, in kW; η dh is the heat release efficiency of the phase change thermal storage steam module 140, in %; Δt is the sampling step, in h; E h is the heat storage capacity, in kWh; Pch (t) is the charging power of the phase change thermal storage steam module 140, in kW; η ch is the charging efficiency of the phase-change thermal storage steam module 140 , in %.

[0106] It can be seen from this that based on the energy cost function and the mathematical model of multiple energy storage devices, the energy cost function can be optimized by using the computing power of the control device. The optimal operating strategy of the energy storage module, phase change thermal storage steam module and heat pump module can be given, and control can be carried out according to the optimal operating strategy to achieve the lowest operating cost and the best economy of the shared energy storage system.

[0107] Based on the shared energy storage system provided in the above embodiments, an embodiment of the present application further provides a shared energy storage method. The shared energy storage method provided in the embodiment of the present application can be applied to the shared energy storage system provided in the above embodiments.

[0108] refer to Figure 2 FIG. 1 is a flow chart of a shared energy storage method provided in an embodiment of the present application, the method comprising the following steps:

[0109] S101, obtaining weather forecast data, user electricity load forecast data, user hot water load forecast data, user steam load forecast data and grid time-of-use electricity price data.

[0110] S102, calculating the power output power and heat collection power of the photovoltaic thermal power generation and heating module based on the meteorological forecast data.

[0111] S103, calculating the power acquisition period and power of the energy storage module, the heat pump module, and the phase-change thermal storage steam module according to the energy cost function, and controlling the operation of the energy storage module, the heat pump module, and the phase-change thermal storage steam module according to the power acquisition period and power.

[0112] The energy cost function is constructed using the grid time-of-use electricity price data, the grid offline power, the time-of-use electricity price data of the photovoltaic thermal power generation and heating module, and the photovoltaic online power of the photovoltaic thermal power generation and heating module; the grid offline power is related to the charging power of the energy storage module, the heating power of the phase change thermal storage steam module, the heat pump electric power, the user's electric load forecast data, and the power generation output power of the photovoltaic thermal power generation and heating module; the photovoltaic online power of the photovoltaic thermal power generation and heating module is related to the power generation output power of the photovoltaic thermal power generation and heating module and the grid offline power; the heat pump electric power is related to the user's hot water load forecast data and the thermal collection power of the photovoltaic thermal power generation and heating module, and the user's steam load forecast data is related to the heating power of the phase change thermal storage steam module.

[0113] As a possible implementation method, the calculation target of the energy cost function is to minimize the energy cost. The energy storage module, the heat pump module and the phase change thermal storage steam module can be calculated according to the energy cost function with the lowest energy cost as the calculation target. The power acquisition period and power acquisition power of the energy storage module, the heat pump module and the phase change thermal storage steam module can be obtained.

[0114] An embodiment of the present application also provides a computer-readable medium for storing program code, which is used to execute any implementation of the methods of the aforementioned embodiments.

[0115] It should be noted that the computer-readable medium mentioned above in this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this application, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, device, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, which carries computer-readable program code. This propagated data signal can take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium may be transmitted using any suitable medium, including but not limited to wires, optical cables, RF (radio frequency), etc., or any suitable combination thereof.

[0116] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0117] It should be noted that those skilled in the art will appreciate that all or part of the processes in the above method embodiments can be implemented by instructing related hardware through a computer program. The program can be stored in a computer-readable medium, and when executed, the program can include the processes in the above method embodiments. The medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

[0118] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the method embodiments are described briefly because they are generally similar to the system embodiments. For relevant parts, refer to the description of the system embodiments.

[0119] The above is only a preferred embodiment of the present application. Although the present application has been disclosed as a preferred embodiment as above, it is not intended to limit the present application. Any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present application without departing from the scope of the technical solution of the present application, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of protection of the technical solution of the present application.

Claims

1. A shared energy storage system, characterized in that: include: Photovoltaic thermal power generation and heating modules, energy storage modules, heat pump modules, phase change thermal storage steam modules, hot water storage tanks and control devices; The photovoltaic thermal power generation and heating module is used to provide electrical energy to the power grid, energy storage module, heat pump module or phase change thermal storage steam module, and to provide thermal energy to the hot water storage tank, which is used to use thermal energy to provide hot water to users; The energy storage module is used to obtain electric energy from the photovoltaic thermal power generation and heating module or the power grid, and to provide electric energy to the heat pump module, the phase change thermal storage steam module and the user; The heat pump module is used to use electrical energy to provide heat energy for the hot water storage tank; The phase-change thermal storage steam module is used to provide steam to users using electrical energy; The control device is used to obtain weather forecast data, user electricity load forecast data, user hot water load forecast data, user steam load forecast data and grid time-of-use electricity price data; the control device is used to calculate the power generation output power and heat collection power of the photovoltaic thermal power generation and heating module according to the weather forecast data; The control device is used to calculate the power acquisition period and power of the energy storage module, the heat pump module and the phase change thermal storage steam module according to the energy cost function, and the control device is used to control the operation of the energy storage module, the heat pump module and the phase change thermal storage steam module according to the power acquisition period and the power; The energy cost function is constructed by using the time-of-use electricity price data of the power grid, the off-grid power of the power grid, the time-of-use electricity price data of the photovoltaic thermal power generation and heating module, and the photovoltaic on-grid power of the photovoltaic thermal power generation and heating module; the off-grid power of the power grid is related to the charging power of the energy storage module, the charging power of the phase change thermal storage steam module, the heat pump electric power, the user's electric load forecast data, and the power generation output power of the photovoltaic thermal power generation and heating module; the photovoltaic on-grid power of the photovoltaic thermal power generation and heating module is related to the power generation output power of the photovoltaic thermal power generation and heating module and the off-grid power of the power grid; the heat pump electric power is related to the user's hot water load forecast data and the heat collection power of the photovoltaic thermal power generation and heating module, and the user's steam load forecast data is related to the charging power of the phase change thermal storage steam module.

2. The system according to claim 1, characterized in that The calculation objective of the energy cost function is to minimize the energy cost; The control device is used to calculate the power acquisition time period and power of the energy storage module, the heat pump module and the phase change thermal storage steam module according to the energy cost function with the lowest energy cost as the calculation target.

3. The system according to claim 2, characterized in that The formula of the energy cost function with the lowest energy cost as the calculation target is: C=min(price ele ×P ele -price pv ×P pvup )×Δt P ele =max(0,(P c +P ch +P HP +P o"he# -P pv )) P pvup =P pv -min(P pv ,(P c +P ch +P HP +P o"he# )) Among them, price ele The time-of-use electricity price data of the power grid, price pv is the time-of-use electricity price data of photovoltaic thermal power generation and heating modules, P ele Grid off-grid power, P pvup is the photovoltaic power of the photovoltaic thermal power generation module, Δt is the measurement time period of the energy cost, P pv is the power output power of the photovoltaic thermal power generation module, P c is the charging power of the energy storage module, P ch is the charging power of the phase change thermal storage steam module, P HP is the heat pump electrical power, P o"he# The total electric power of the user's electric load is the total electric power of the user's electric load, and the user's electric load prediction data includes the total electric power of the user's electric load.

4. The system according to claim 1, characterized in that The calculation formula of the heat pump electric power is: P HP =(Q hw -P pvhe(" ) / COP Among them, Q hw is the user's hot water load forecast data, P pvhe(" is the heat collection power of the photovoltaic thermal power generation and heating module, and COP is the heating coefficient of the heat pump module.

5. The system according to claim 4, characterized in that When the heat collection power of the photovoltaic thermal power generation and heating module is greater than the user's hot water load forecast data, and the water temperature of the hot water storage tank is greater than the user's required water temperature, the heat pump module is not started; When the heat collection power of the photovoltaic thermal power generation and heating module is less than the user's hot water load prediction data, the heat pump module is started.

6. The system according to claim 5, characterized in that Also includes: A first circulating hot water pipeline, a first circulating water pump and a first stop valve; The first circulating hot water pipeline is used to connect the hot water storage tank and the heat pump module; The first circulating water pump is used to provide power for hot water circulation in the first circulating hot water pipeline; The first stop valve is used to open or close the hot water circulation of the first circulating hot water pipeline; The opening or closing of the first circulating water pump and the first stop valve is synchronized with the opening or closing of the heat pump module.

7. The system according to claim 1, characterized in that Also includes: a second circulating hot water pipeline, a second circulating water pump and a second stop valve; The second circulating hot water pipeline is used to connect the hot water storage tank and the photovoltaic thermal power generation and heating module; The second circulating water pump is used to provide power for hot water circulation in the second circulating hot water pipeline; The second stop valve is used to open or close the hot water circulation of the second circulating hot water pipeline.

8. The system according to claim 7, characterized in that The weather forecast data includes the temperature of the solar panels; When the temperature of the solar panel is greater than the water temperature of the water storage tank, the second circulating water pump and the second stop valve are turned on, and the photovoltaic thermal power generation and heating module is used to provide heat energy for the water storage tank; When the water inlet temperature is lower than the water outlet temperature when the water flows through the photovoltaic thermal power generation and heating module, the second circulating water pump and the second stop valve are closed.

9. A shared energy storage method, characterized in that: Applied to the shared energy storage system according to any one of claims 1 to 8, the method comprising: Obtain weather forecast data, user electricity load forecast data, user hot water load forecast data, user steam load forecast data and grid time-of-use electricity price data; Calculate the power generation output power and heat collection power of the photovoltaic thermal power generation and heating module according to the meteorological forecast data; Calculating the electric energy acquisition period and electric energy acquisition power of the energy storage module, the heat pump module and the phase-change thermal storage steam module according to the energy cost function, and controlling the operation of the energy storage module, the heat pump module and the phase-change thermal storage steam module according to the electric energy acquisition period and the electric energy acquisition power; The energy cost function is constructed by using the time-of-use electricity price data of the power grid, the off-grid power of the power grid, the time-of-use electricity price data of the photovoltaic thermal power generation and heating module, and the photovoltaic on-grid power of the photovoltaic thermal power generation and heating module; the off-grid power of the power grid is related to the charging power of the energy storage module, the charging power of the phase change thermal storage steam module, the heat pump electric power, the user's electric load forecast data, and the power generation output power of the photovoltaic thermal power generation and heating module; the photovoltaic on-grid power of the photovoltaic thermal power generation and heating module is related to the power generation output power of the photovoltaic thermal power generation and heating module and the off-grid power of the power grid; the heat pump electric power is related to the user's hot water load forecast data and the heat collection power of the photovoltaic thermal power generation and heating module, and the user's steam load forecast data is related to the charging power of the phase change thermal storage steam module.

10. A computer storage medium, characterized in that: The computer storage medium is used to store a computer program, and when the computer program is run on a computer device, the computer device is caused to execute the method according to claim 9 .

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