Cross-seasonal heat storage and geothermal coupling heat supply system based on wind and light absorption and control method

Abstract

The invention provides a cross-seasonal heat storage and terrestrial heat coupling heat supply system based on wind and light absorption and a control method, the system comprises a terrestrial heat supply subsystem, a wind and light absorption power supply subsystem and a cross-seasonal heat storage and supply subsystem, and the terrestrial heat supply subsystem is used for extracting heat in terrestrial heat and supplying heat to heat users in the heating season; the wind and light absorption power supply subsystem is used for supplying power to electric equipment of the system by utilizing wind-abandoning and light-abandoning electric power; and the cross-seasonal heat storage and supply subsystem is used for converting the electric energy of the wind and light absorbed electric power into heat energy and storing the heat energy in a cross-seasonal heat storage water tank, and the cross-seasonal heat storage water tank is connected with the first heat exchanger and the heat pump to supply heat to heat users in the heat supply season. According to the system, abandoned wind and abandoned light energy is reasonably utilized in a cross-seasonal heat storage means, renewable energy sources of all parts are efficiently utilized by coupling a geothermal energy heat supply system, multi-heat-source heat supply serves as a guarantee, the stability of the heat supply system is improved, and pollution caused by traditional fossil energy heat supply is greatly reduced.

Description

Technical Field

[0001] The present application relates to the field of wind and solar energy storage technology, and more specifically, to a cross-seasonal heat storage and geothermal coupled heating system based on wind and solar energy consumption and a control method. Background Art

[0002] With the rapid development of new energy power generation technologies, the utilization rate of new energy power generation has increased year by year, but the absolute amount of wind and solar power curtailment has increased significantly. In Northwest my country, residential electricity load is relatively low in the summer, and wind and photovoltaic power generation are relatively high in the summer. However, high winter heating electricity demand creates a serious supply-demand mismatch, making the problem of wind and solar power curtailment more prominent in the summer. Western China has abundant renewable energy resources and a long heating cycle. Therefore, vigorously promoting renewable energy heating in clean building heating has significant resource and geographical advantages.

[0003] Traditional energy heating methods have problems such as high fossil energy consumption and serious environmental pollution. Among renewable energy heating methods, deep-layer geothermal technology has broad application prospects and has been widely used, but the following technical problems still exist: (1) Geothermal resource conditions vary from place to place, and the geothermal water outlet temperature is in the range of 40℃-90℃. When the temperature is low, it is limited to its use in centralized heating systems; (2) Long-term operation will cause the underground rock and soil temperature to drop, which not only affects the heating energy efficiency but also reduces the effective heating area and increases the operating cost; (3) Geothermal + heat pump units can effectively improve the utilization rate of geothermal energy in the system, but there are problems such as insufficient heat pump unit's ability to bear the peak load.

[0004] Therefore, the traditional single heat source heating system and the existing coupled geothermal energy and other renewable energy heating system technologies still have problems such as large fossil energy consumption, insufficient complementarity of renewable energy, low matching between intermittent energy supply and demand, and extensive control strategies. Summary of the Invention

[0005] In view of this, the present application provides a cross-seasonal heat storage and geothermal coupling heating system and control method based on wind and solar power consumption, so as to achieve multi-heat source heating to improve the stability of the heating system and improve the wind and solar power consumption capacity and utilization rate, and realize the efficient use of renewable energy.

[0006] To achieve the above objectives, the technical solutions adopted in this application are as follows: The inter-seasonal heat storage and geothermal coupling heating system based on wind and solar consumption includes: a geothermal heating subsystem, a wind and solar consumption power supply subsystem and an inter-seasonal heat storage heating subsystem. The geothermal heating subsystem is used to extract heat from geothermal energy and provide heating to heat users during the heating season; the wind and solar consumption power supply subsystem uses the abandoned wind and solar power to power the system's electrical equipment. The system's electrical equipment refers to all equipment that requires electricity in the inter-seasonal heat storage and geothermal coupling heating system based on wind and solar consumption; the inter-seasonal heat storage heating subsystem converts the electrical energy of the wind and solar consumption power into thermal energy and stores it in an inter-seasonal heat storage tank. The inter-seasonal heat storage tank is connected to a first heat exchanger and a heat pump to provide heating to heat users during the heating season.

[0007] Furthermore, the geothermal heating subsystem includes a geothermal water production well, a heat exchange device and a geothermal reinjection well, and the heat exchange device includes a second heat exchanger and a third heat exchanger; Geothermal water wells, used to extract heat from geothermal water; a second heat exchanger, disposed between the geothermal heating pump and the first circulating water pump; a third heat exchanger, disposed between the second heat exchanger and the fourth circulating water pump; The geothermal recharge well is connected to the inter-seasonal hot water storage tank through the third heat exchanger and the fourth circulating water pump.

[0008] Furthermore, the wind-solar power consumption and electricity supply subsystem includes a power generation device and a power storage device, the power generation device includes a wind turbine and a photovoltaic module, the wind turbine is used to convert wind energy into electrical energy, the photovoltaic module is used to convert solar energy into electrical energy, and the wind turbine and the photovoltaic module are both connected to the power storage device; The electricity storage device includes a storage battery, which is used to store excess electricity when the power generation device generates excess electricity, and release the stored electricity to power the system's electrical equipment when the power generation device generates insufficient electricity; the storage battery connects the power generation device and the system's electrical equipment through a power pipeline, the storage battery is connected to the cross-seasonal heat storage and heating subsystem through an electric boiler and a heat pump, the storage battery is connected to the wind and solar absorption and power supply subsystem through a photovoltaic module and a wind turbine, and the storage battery is connected to the geothermal heating pump and the geothermal heating subsystem through relevant circulating water pumps, and the relevant circulating water pumps include a first circulating water pump, a second circulating water pump, a third circulating water pump and a fourth circulating water pump.

[0009] Furthermore, the inter-seasonal heat storage and heating subsystem includes: An electric boiler is connected to the inter-seasonal hot water storage tank, and the electric boiler converts electrical energy into thermal energy to heat the water in the pipeline and then transmits the heat to the inter-seasonal hot water storage tank for heat storage; The constant pressure water supply device is connected to the cross-seasonal heat storage tank through the electric boiler to supply the system pipeline with softened water at a constant pressure; The inter-seasonal hot water storage tank is installed between the heat exchanger and the electric boiler; Buffer water tank, installed between the heat user and the heat pump.

[0010] Furthermore, the system also includes a prediction control module, which is used to use the GRU power curtailment prediction model to predict the power curtailment of the heating system, and intelligently regulate the coordinated operation of the geothermal heating subsystem, the wind and solar power consumption subsystem and the inter-seasonal heat storage heating subsystem based on the prediction results.

[0011] Furthermore, the method of using the GRU power curtailment prediction model to predict the power curtailment of the heating system and intelligently regulating the coordinated operation of the geothermal heating subsystem, the wind and solar power consumption subsystem, and the inter-seasonal heat storage heating subsystem according to the prediction results specifically includes the following steps: a. Normalize the historical data of wind and solar power generation and environmental parameters according to formula (1); in, For the t Moment i dimensional original input data, and are the mean and standard deviation of the corresponding features of the training set, d The input dimensions include wind speed, irradiance, ambient temperature and historical power curtailment. b. Define the update gate of GRU according to formula (2) and reset gate : in, and is the weight matrix, and is the bias term, is the Sigmoid activation function, Indicates the historical state, x t is the current input; c. Generate candidate states and update hidden states according to formulas (3) and (4) respectively; Generate candidate states in, represents element-wise multiplication, tanh (*) is the hyperbolic tangent function, is the weight matrix, Indicates the current candidate status; Update hidden state in, represents the final hidden state; d. Use the fully connected layer to map the hidden state to the predicted value of power curtailment according to formula (5), and output the predicted value of power curtailment; in, is the output weight, is the bias term, For the t The amount of curtailment predicted at any given moment; e. Forecasted power abandonment in the inter-seasonal heat storage and heating subsystem Start the electric boiler to consume the abandoned electricity and store heat ( The heat threshold is a set reference value used to determine whether to start the electric boiler to deal with power abandonment). The power setting is: in, is the maximum power of the electric boiler; f. The geothermal heating subsystem dynamically adjusts the geothermal pump output according to the prediction results of step d and formula (11) to prevent over-extraction of rock and soil; in, Contribute to geothermal foundation, In adjustable increments.

[0012] Furthermore, the prediction control module also includes an optimization module for correcting the parameters of the GRU power curtailment prediction model according to the power curtailment prediction error, specifically including the steps of: g. Calculate the prediction error of abandoned power based on the predicted value of abandoned power , and the distribution of the prediction error of the power curtailment is modeled, assuming that the prediction error follows a normal distribution: h. Calculate the distribution parameters by maximum likelihood estimation: in, is the number of training samples, Error The estimated mean of , reflecting the central tendency of the error, Representation error The estimated variance of Around the mean The degree of dispersion; i. Generated using Latin hypercube sampling M Each scenario has a power curtailment error scenario. s The error is: in, is the inverse cumulative function of the standard normal distribution, For stratified random indexing, generate stratified random samples covering the forecast error distribution; j. Synchronous back-generation reduction defines the distance metric between scenes: Iteratively merge the scene pairs with the smallest distance until the number of remaining scenes is K satisfy K ≤ K max , obtain the reduced number of scenarios, analyze the prediction error accuracy and causes based on the reduced number of scenarios, and then modify the prediction model.

[0013] A method for controlling cross-seasonal heat storage and geothermal coupled heating based on wind and solar power consumption is used in the above-mentioned cross-seasonal heat storage and geothermal coupled heating system based on wind and solar power consumption, the method comprising: S1: The wind and solar power consumption subsystem converts abandoned wind and solar power into electrical energy; S2: Powering the system electrical equipment with the converted electric energy, and determining whether the power generated by the wind-solar power consumption subsystem is greater than the load of the system electrical equipment; S3: If yes, the excess electricity generated by the power generation device is preferentially supplied to the constant pressure water supply pump and the electric boiler to maintain the water temperature in the inter-seasonal hot water storage tank, and the excess electricity is then stored in the storage battery; otherwise, the power generation device and the storage device jointly supply power to the system electrical equipment; S4: the inter-seasonal heat storage and heating subsystem stores heat in the inter-seasonal heat storage tank to provide heat to heat users during the heating season, and determines whether the temperature in the inter-seasonal heat storage tank is greater than the heating temperature; S5: If yes, the heat energy in the inter-seasonal hot water storage tank is transferred to the buffer water tank; otherwise, the water in the inter-seasonal hot water storage tank is regarded as a low-temperature heat source and heated by the heat pump before being transferred to the buffer water tank; S6: The buffer water tank supplies heat energy to heat users through the heat storage heating pump; S7: The geothermal heating subsystem extracts heat energy from the geothermal water through the second heat exchanger and supplies heat to the heat user through the geothermal heating pump, and determines whether the geothermal water outlet temperature is greater than the heating temperature. If so, the geothermal water is delivered to the heat user.

[0014] Furthermore, the step S7 specifically includes: During the heating season, the geothermal heating subsystem extracts the heat energy from the geothermal water through the second heat exchanger and supplies heat to the heat users through the geothermal heating pump, and determines whether the geothermal water outlet temperature is greater than the heating temperature. If so, the geothermal water is transported to the heat users; during the non-heating season, the water in the cross-seasonal heat storage tank is pumped by the fourth circulating water pump through the third heat exchanger to replenish the heat to the recharge well for geothermal heating.

[0015] Compared with the prior art, the present invention has the following advantages: 1. Rationally utilize abandoned wind and solar energy through cross-seasonal heat storage. By coupling the geothermal heating system, all renewable energy sources can be efficiently utilized. With multiple heat sources as a guarantee, the stability of the heating system is improved, and the pollution caused by traditional fossil energy heating is greatly reduced. 2. To address the technical issues of traditional geothermal energy utilization, namely, unstable geothermal water temperature, which, due to long-term operation, will cause underground rock and soil temperature to drop, reducing the effective heating area and increasing operating costs, by exchanging heat between the water in the cross-seasonal hot water storage tank and the geothermal recharge well during the non-heating season, the rock and soil temperature and the effective heating area are maintained, solving the problem of reduced geothermal heating efficiency caused by long-term single geothermal heating and extending the service life of the geothermal water well; 3. The use of heat exchangers to extract heat from geothermal energy prevents geothermal water from entering the circulating water system of heat users and causing erosion and other damage to the circulating water pipelines of heat users; 4. Through the long-term storage and reuse of electricity and thermal energy across seasons, the losses caused by the imbalance of wind and solar energy in different seasons can be efficiently utilized. The heating model that prioritizes the consumption of abandoned wind and solar energy for heating and then supplements it with geothermal energy can greatly solve the problem of mismatch between renewable energy production capacity and load demand in the power system on a long-term scale, ensuring the system's high wind and solar energy absorption capacity and economic efficiency. 5. Using the GRU neural network algorithm for wind and solar curtailment prediction solves the problem that traditional RNNs have difficulty capturing long-term dependencies. GRU also has a simpler structure and higher computational efficiency than LSTM, making it more suitable for time series modeling tasks such as wind and solar power generation forecasting. Furthermore, GRU can dynamically adjust model parameters based on historical data to adapt to changing patterns over time. In this system, accurate prediction of curtailment can provide timely decision-making for subsystem scheduling, optimize the energy storage system, flexibly allocate resources, and improve overall system efficiency. 6. After the system is built, it can operate independently to ensure that when a problem occurs in a certain device or link, it can still provide independent heat to maintain the normal operation of the system. The energy storage device can bear the peak load of the building to a great extent, which can reduce the electricity cost of the heating system and increase the load rate of the power grid. The system device only needs simple maintenance in the later stage, which has great potential and advantages in popularization and market promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a schematic diagram of the structure of the cross-seasonal heat storage and geothermal coupled heating system based on wind and solar power consumption in this application.

[0018] Figure 2 This is the structural block diagram of the cross-seasonal heat storage and geothermal coupled heating system based on wind and solar power consumption in this application.

[0019] Figure 3 This is a flow chart of the cross-seasonal heat storage and geothermal coupled heating control method based on wind and solar power consumption in this application. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0021] like Figure 1 and Figure 2 As shown, the inter-seasonal heat storage and geothermal coupling heating system based on wind and solar consumption includes: a geothermal heating subsystem, a wind and solar consumption power supply subsystem and an inter-seasonal heat storage heating subsystem. The geothermal heating subsystem is used to extract heat from geothermal energy and provide heating to heat users during the heating season; the wind and solar consumption power supply subsystem uses the abandoned wind and solar power to power the system's electrical equipment. The system's electrical equipment refers to all equipment that requires electricity in the inter-seasonal heat storage and geothermal coupling heating system based on wind and solar consumption; the inter-seasonal heat storage heating subsystem converts the electrical energy of the wind and solar consumption power into thermal energy and stores it in the inter-seasonal hot water storage tank 5. The inter-seasonal hot water storage tank 5 is connected to the first heat exchanger 7 and the heat pump 6 to provide heating to heat users during the heating season.

[0022] Furthermore, the geothermal heating subsystem includes a geothermal water production well 12, a heat exchange device and a geothermal reinjection well 11, and the heat exchange device includes a second heat exchanger 13 and a third heat exchanger 14; A geothermal water well 12 is used to extract heat from geothermal water; The second heat exchanger 13 is provided between the geothermal heating pump 18 and the first circulating water pump 15; The third heat exchanger 14 is provided between the second heat exchanger 13 and the fourth circulating water pump 21; The geothermal recharge well 11 is connected to the inter-seasonal hot water storage tank 5 through the third heat exchanger 14 and the fourth circulating water pump 21 .

[0023] The heating system and its subsystems in this application can be divided into heating season operation mode and non-heating season operation mode according to heat user demand and working hours; The system heating temperature is set to the first temperature threshold, which is set between 60 and 80 degrees Celsius; The system's geothermal water outlet temperature is set to a second temperature threshold, which is set between 50 and 80 degrees Celsius; The temperature of the inter-seasonal hot water storage tank 5 is set to a third temperature threshold, which can be 45 to 85 degrees Celsius depending on the scale of the inter-seasonal hot water storage tank 5 and the heating scenario; The geothermal heating subsystem extracts heat energy from geothermal water and provides heat to heat users 9, or stores the heat in a cross-seasonal heat storage tank 5; During the heating season, determining whether the geothermal water outlet temperature is greater than or equal to a first temperature threshold; If yes, the geothermal hot water is delivered to the heat user 9; In the non-heating season, determining whether the geothermal water outlet temperature is greater than a second temperature threshold; If so, the geothermal hot water is transported to the inter-seasonal hot water storage tank 5; Specifically, in the geothermal heating subsystem, during the heating season, the first circulating water pump 15 extracts the heat from the water well 12 through the second heat exchanger 13, and provides heat energy to the heat user 9 through the geothermal heating pump 18; in the non-heating season, in order to alleviate the drop in rock and soil temperature caused by long-term heating by a single geothermal energy, the increase in operating costs caused by the reduction in heating energy efficiency and the reduction in effective heating area, the water in the inter-seasonal heat storage tank 5 is transferred by the fourth circulating water pump 21 through the third heat exchanger 14 to the recharge well 11 for geothermal heating. The design of the geothermal water exchange water cycle can avoid the erosion of geothermal water to cause damage to the pipelines of the heat user 9, and the coupling of the inter-seasonal heat storage heat pump 6 can effectively improve the utilization rate of the system's geothermal energy, and to a certain extent improve the peak-shaving capacity of the heat load.

[0024] The specific operation is as follows: during the heating season, the first circulating water pump 15, the geothermal heating pump 18, the first switch 23, and the sixth switch 28 are turned on. Under the action of the first circulating water pump 15, the geothermal water heat energy is transferred to the water body output by the inter-seasonal hot water storage tank 5 through the second heat exchanger 13, and then supplied to the heat user 9 through the geothermal heating pump 18; In the non-heating season, the first circulating water pump 15, the fourth circulating water pump 21, the first switch 23, and the fourth switch 26 are turned on to transfer the heat of the water in the inter-seasonal hot water storage tank 5 to the ground through the third heat exchanger 14 for ground heating.

[0025] Furthermore, the wind-solar power consumption and electricity supply subsystem includes a power generation device and a power storage device. The power generation device includes a wind turbine 1 and a photovoltaic module 2. The wind turbine 1 is used to convert wind energy into electrical energy, and the photovoltaic module 2 is used to convert solar energy into electrical energy. The wind turbine 1 and the photovoltaic module 2 are both connected to the power storage device. The energy storage device includes an energy storage battery 3, which is used to store excess electricity when the power generation device generates excess electricity, and release the stored electricity to power the system's electrical equipment when the power generation device generates insufficient electricity; the energy storage battery 3 connects the power generation device and the system's electrical equipment through a power pipeline, and the energy storage battery 3 is connected to the cross-seasonal heat storage and heating subsystem through the electric boiler 4 and the heat pump 6, and the energy storage battery 3 is connected to the wind and solar power consumption subsystem through the photovoltaic module 2 and the wind turbine 1, and the energy storage battery 3 is connected to the geothermal heating pump 18 and the geothermal heating subsystem through relevant circulating water pumps, and the relevant circulating water pumps include a first circulating water pump 15, a second circulating water pump 16, a third circulating water pump 17 and a fourth circulating water pump 21.

[0026] Specifically, during the non-heating season, the wind-solar consumption and power supply subsystem consumes abandoned wind and solar power through the wind turbine 1 and the photovoltaic module 2. When the generated power is greater than the load of the system's electrical equipment, the electricity is preferentially supplied to the constant-pressure water supply pump 20 and the electric boiler 4 to maintain the water temperature in the cross-seasonal hot water storage tank 5, and the excess generated power is stored in the storage battery 3. The storage battery 3 can fully bear the peak load of the building. When the system power load is high, the stored electricity is used together with the wind turbine 1 and the photovoltaic module 2 to power the system; During the heating season, the wind turbine 1, photovoltaic panels 2 and storage batteries 3 jointly supply power to the system's electrical equipment; using abandoned wind and solar power generation to power the system can alleviate the losses caused by abandoned wind and solar power generation due to seasonal supply and demand imbalances. The priority and efficient utilization of abandoned wind and solar power and the geothermal energy backup supplementary heating mode can achieve efficient and energy-saving operation of the system under a long heating cycle.

[0027] The specific operation is that the wind turbine 1 and the photovoltaic module 2 are connected to the storage battery 3, and the power generation device and the power storage device supply power to the electric boiler 4, the heat pump 6, the first circulating water pump 15, the second circulating water pump 16, the third circulating water pump 17, the geothermal heating pump 18, the heat storage heating pump 19, the constant pressure make-up water pump 20, the fourth circulating water pump 21 and the fifth circulating water pump 22 through the power line.

[0028] Furthermore, the inter-seasonal heat storage and heating subsystem includes: The electric boiler 4 is connected to the inter-seasonal hot water storage tank 5. The electric boiler 4 converts electrical energy into thermal energy to heat the water in the pipeline and then transmits the heat to the inter-seasonal hot water storage tank 5 for heat storage; The constant pressure water supply device 10 is connected to the inter-seasonal hot water storage tank 5 through the electric boiler 4 to supply the system pipeline with softened water at a constant pressure; The inter-seasonal hot water storage tank 5 is arranged between the heat exchanger and the electric boiler 4. The heat exchanger is the first heat exchanger 7, the second heat exchanger 13 and the third heat exchanger 14; The buffer water tank 8 is arranged between the heat user 9 and the heat pump 8 .

[0029] The inter-seasonal heat storage and heating subsystem stores heat through inter-seasonal heat storage and supplies heat to heat users during the heating season; Determining whether the temperature in the cross-seasonal hot water storage tank is greater than a first temperature threshold; If so, the heat energy in the inter-seasonal hot water storage tank is transferred to the buffer water tank; Determining whether the temperature in the cross-seasonal hot water storage tank is less than a first temperature threshold; If so, the water in the inter-seasonal hot water storage tank is regarded as a low-temperature heat source, heated by the heat pump and then transported to the buffer water tank; The inter-seasonal heat storage and heating subsystem can realize the long-term storage of surplus heat energy produced in the non-heating season and reuse it in the heating season. In the non-heating season, the power generation device converts the abandoned wind and solar power into electricity to supply the electric boiler 4. The electric boiler 4 insulates and heats the water in the inter-seasonal heat storage tank 5, thereby storing the abandoned wind and solar power in the non-heating season through energy conversion.

[0030] In the heating season, when the temperature of the water in the inter-seasonal hot water storage tank 5 meets the standard, the heat is transferred to the buffer water tank 8 through the first heat exchanger 7, and then the heat is supplied to the heat user 9 through the geothermal heating pump 19. When the temperature of the inter-seasonal hot water storage tank 5 does not meet the standard or there is a large demand for heating and a high demand for thermal energy, the water in the inter-seasonal hot water storage tank 5 is regarded as a low-temperature heat source, heated by the heat pump 6 and then transferred to the buffer water tank 8, and then higher-grade thermal energy is supplied to the heat user 9 through the heat storage heating pump 19 (the high-grade thermal energy refers to thermal energy with higher temperature and better energy quality). Thermal energy), and finally, when the peak heating period ends or the heating cycle ends, the temperature of the cold fluid after fully utilizing the thermal energy is ensured to be within the geothermal tail water temperature range specified by the state when it returns to the water tank. It returns to the buffer water tank 8 and then returns to the inter-seasonal heat storage tank 5 through the heat exchanger 7 for subsequent heat and water replenishment. When the single geothermal energy heating cannot meet the heating needs of the heat user 9, the inter-seasonal heat storage heating subsystem will promptly provide supplementary heating. The heat pump 6 provides higher-quality thermal energy to meet various heating needs, realizing efficient, flexible and stable energy supply for the system. The specific operation is as follows: in the non-heating season, the wind turbine 1 and the photovoltaic module 2 transmit electric energy to the electric boiler 4, and the electric boiler 4 is started to transmit heat energy to the inter-seasonal hot water storage tank 5; in the heating season, the inter-seasonal hot water storage tank 5 exchanges heat to the buffer water tank 8 through the first heat exchange device 7, and the heat storage heating pump 19 and the third switch 25 are turned on to provide heat to the heat user 9. Optionally, the second circulating water pump 16 and the heat pump 6 are turned on for reheating, and then the buffer water tank 8, the geothermal heating pump 19 and the third switch 25 are used to provide higher quality heating to the heat user 9. After the heating cycle ends, the cold fluid flows back, and the fifth circulating water pump 22 and the second switch 24 are turned on to transmit the cold fluid to the buffer water tank 8, and return to the inter-seasonal hot water storage tank 5 through the first heat exchanger 7.

[0031] Furthermore, the system also includes a prediction control module 29, which is used to use the GRU power curtailment prediction model to predict the power curtailment of the heating system, and intelligently regulate the coordinated operation of the geothermal heating subsystem, the wind and solar power consumption subsystem and the inter-seasonal heat storage heating subsystem based on the prediction results.

[0032] Furthermore, the method of using the GRU power curtailment prediction model to predict the power curtailment of the heating system and intelligently regulating the coordinated operation of the geothermal heating subsystem, the wind and solar power consumption subsystem, and the inter-seasonal heat storage heating subsystem according to the prediction results specifically includes the following steps: a. Normalize the historical data of wind and solar power generation and environmental parameters according to formula (1); (1) in, For the t Moment i dimensional original input data, and are the mean and standard deviation of the corresponding features of the training set, d The input dimensions include wind speed, irradiance, ambient temperature and historical power curtailment. The forecast control center 29 collects local meteorological data information, collects data feedback from the wind turbine 1 and the photovoltaic module 2, analyzes the collected information and analyzes the power generation of the wind turbine 1 and the photovoltaic module 2 in the next period.

[0033] Specifically, historical data from wind farms and photovoltaic power stations is collected at a 15-minute sampling frequency. This includes historical wind and solar power output data, local meteorological data (such as wind speed, irradiance, and ambient temperature), and user heat load requirements. The output label is the amount of power curtailed, and the characteristics and weights of influencing factors are extracted. In addition, meteorological data for the corresponding city and time can be obtained from the website of the China Meteorological Data Service Center. Standardizing the collected raw data according to formula (1) can eliminate the dimensional differences between different features and reduce the differences in data features such as wind speed and irradiance to a similar range, making model training more stable and accelerating convergence.

[0034] b. Define the update gate of GRU according to formula (2) and reset gate : in, and is the weight matrix, and is the bias term, is the Sigmoid activation function, Indicates the historical state, x t is the current input; c. Generate candidate states and update hidden states according to formulas (3) and (4) respectively; Generate candidate states in, represents element-wise multiplication, tanh (*) is the hyperbolic tangent function, is the weight matrix, Indicates the current candidate status; Generate a temporary candidate state , combined with the current input x t and the historical state after the reset gate adjustment r t ⊙ h t−1 , dynamically adjust historical information, if the door is reset r t ≈ If the value is 0, historical information is ignored and only the current input is relied upon to flexibly respond to sudden meteorological conditions, such as a sudden drop in wind speed or sudden extreme weather.

[0035] Update hidden state in, represents the final hidden state; Among them, through the update gate Dynamic fusion history status With the current candidate status , and get the final hidden state This step is used to balance historical and current information, which is suitable for capturing short-term fluctuations such as the rapid changes in photovoltaic output due to cloud cover. ≈0, then ≈ , that is, preserving long-term trends (such as seasonal wind speed variations).

[0036] d. Use the fully connected layer to map the hidden state to the predicted value of power curtailment according to formula (5), and output the predicted value of power curtailment; in, is the output weight, is the bias term, For the t The amount of curtailment predicted at any given moment; e. Forecasted power abandonment in the inter-seasonal heat storage and heating subsystem When the electric boiler is started to consume the abandoned electricity and store heat, the power setting is: in, is the maximum power of the electric boiler; f. The geothermal heating subsystem dynamically adjusts the geothermal pump output according to the prediction results of step d and formula (11) to prevent over-extraction of rock and soil; in, Contribute to geothermal foundation, In adjustable increments.

[0037] Furthermore, the prediction control module also includes an optimization module for correcting the parameters of the GRU power curtailment prediction model according to the power curtailment prediction error, specifically including the steps of: g. Calculate the prediction error of abandoned power based on the predicted value of abandoned power , and model the distribution of the curtailment prediction error, assuming that the prediction residual follows a normal distribution: h. Calculate the distribution parameters by maximum likelihood estimation: in, is the number of training samples, Error The estimated mean of , reflecting the central tendency of the error, Representation error The estimated variance of Around the mean The degree of dispersion; i. Generated using Latin hypercube sampling M Each scenario has a power curtailment error scenario. s The error is: in, is the inverse cumulative function of the standard normal distribution, Generate stratified random samples that cover the distribution of prediction errors to ensure that there are samples in each stratified interval and avoid local aggregation problems of sampling. M The computational complexity of the scene is O(M) Outperforming random sampling, it converts forecast uncertainty into actionable optimization output through error distribution fitting and LHS scenario generation.

[0038] By constructing multiple scenarios through Latin hypercube sampling technology, we can obtain a series of possible parameter values of wind and solar power curtailment under different situations and their corresponding probability distributions, thereby providing a more comprehensive information basis for decisions such as power dispatching and operation planning.

[0039] j. Synchronous back-generation reduction defines the distance metric between scenes: Iteratively merge the scene pairs with the smallest distance until the number of remaining scenes is K satisfy K ≤ K max , and update the scenario probability weights, gradually merge the amount of power curtailment, reduce the scale of scenarios with similar power generation, give priority to retaining high-probability and extreme scenarios (such as extreme power curtailment events), avoid overly optimistic optimization results, obtain the reduced number of scenarios, analyze the prediction error accuracy and causes based on the reduced number of scenarios, and then correct the prediction model. The correction method is to model the prediction error as one of the outputs of the model, learn the residual between the predicted value and the actual value through training the model, and then add the residual back to the original predicted value for correction.

[0040] Using the GRU neural network-based predictive control module, intelligent energy scheduling is achieved according to the system control method. Based on the wind and solar power forecast results, the storage / supply control of wind farms and photovoltaic farms is designed. According to the control logic, the scheduling of the wind and solar power consumption and supply subsystem and the cross-seasonal heat storage and heating subsystem is adjusted. Energy time shifting is achieved through the energy storage system, the net load curve is smoothed, and the stability and economy of the power grid operation are ensured.

[0041] like Figure 3 As shown, a method for controlling inter-seasonal heat storage and geothermal coupled heating based on wind and solar power consumption is used for the above-mentioned inter-seasonal heat storage and geothermal coupled heating system based on wind and solar power consumption, and the method includes: S1: The wind and solar power consumption subsystem converts abandoned wind and solar power into electrical energy; S2: Powering the system electrical equipment with the converted electric energy, and determining whether the power generated by the wind-solar power consumption subsystem is greater than the load of the system electrical equipment; S3: If yes, the excess electricity generated by the power generation device is preferentially supplied to the constant pressure water supply pump and the electric boiler to maintain the water temperature in the inter-seasonal hot water storage tank, and the excess electricity is then stored in the storage battery; otherwise, the power generation device and the storage device jointly supply power to the system electrical equipment; S4: the inter-seasonal heat storage and heating subsystem stores heat in the inter-seasonal heat storage tank to provide heat to heat users during the heating season, and determines whether the temperature in the inter-seasonal heat storage tank is greater than the heating temperature; S5: If yes, the heat energy in the inter-seasonal hot water storage tank is transferred to the buffer water tank; otherwise, the water in the inter-seasonal hot water storage tank is regarded as a low-temperature heat source and heated by the heat pump before being transferred to the buffer water tank; S6: The buffer water tank supplies heat energy to heat users through the heat storage heating pump; S7: The geothermal heating subsystem extracts heat energy from the geothermal water through the second heat exchanger and supplies heat to the heat user through the geothermal heating pump, and determines whether the geothermal water outlet temperature is greater than the heating temperature. If so, the geothermal water is delivered to the heat user.

[0042] Furthermore, the step S7 specifically includes: During the heating season, the geothermal heating subsystem extracts the heat energy from the geothermal water through the second heat exchanger and supplies heat to the heat users through the geothermal heating pump, and determines whether the geothermal water outlet temperature is greater than the heating temperature. If so, the geothermal water is transported to the heat users; during the non-heating season, the water in the cross-seasonal heat storage tank is pumped by the fourth circulating water pump through the third heat exchanger to replenish the heat to the recharge well for geothermal heating.

[0043] This application proposes a cross-seasonal heat storage and geothermal coupling heating system and control method based on wind and solar power consumption, proposes a multi-source coordination and energy priority scheduling strategy, uses GRU neural network prediction to perform intelligent prediction and multi-scenario optimization of wind and solar power curtailment, and implements energy storage-geothermal coordinated control and adds a rock and soil heating mechanism in the non-heating season to increase the life of the geothermal field. It greatly improves the operating stability of the heating system and the utilization rate of renewable energy, and flexibly meets the different heating needs of heat users.

[0044] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A cross-seasonal heat storage and geothermal coupling heating system based on wind and solar power consumption, characterized by: include: The geothermal heating subsystem, the wind and solar power consumption power supply subsystem and the inter-seasonal heat storage and heating subsystem are used to extract heat from the geothermal energy and provide heating to heat users during the heating season; the wind and solar power consumption power supply subsystem uses the abandoned wind and solar power to power the system's electrical equipment. The system's electrical equipment refers to all equipment that requires electricity in the inter-seasonal heat storage and geothermal coupled heating system based on wind and solar power consumption; the inter-seasonal heat storage and heating subsystem converts the electrical energy of the wind and solar power consumption into thermal energy and stores it in an inter-seasonal heat storage tank. The inter-seasonal heat storage tank is connected to the first heat exchanger and the heat pump to provide heating to heat users during the heating season.

2. The cross-seasonal heat storage and geothermal coupled heating system based on wind and solar power consumption according to claim 1 is characterized in that: The geothermal heating subsystem includes a geothermal water production well, a heat exchange device and a geothermal reinjection well, and the heat exchange device includes a second heat exchanger and a third heat exchanger; Geothermal water wells, used to extract heat from geothermal water; a second heat exchanger, disposed between the geothermal heating pump and the first circulating water pump; a third heat exchanger, disposed between the second heat exchanger and the fourth circulating water pump; The geothermal recharge well is connected to the inter-seasonal hot water storage tank through the third heat exchanger and the fourth circulating water pump.

3. The cross-seasonal heat storage and geothermal coupled heating system based on wind and solar power consumption according to claim 1 is characterized in that: The wind-solar consumption and power supply subsystem includes a power generation device and a power storage device. The power generation device includes a wind turbine and a photovoltaic module. The wind turbine is used to convert wind energy into electrical energy. The photovoltaic module is used to convert solar energy into electrical energy. Both the wind turbine and the photovoltaic module are connected to the power storage device. The electricity storage device includes a storage battery, which is used to store excess electricity when the power generation device generates excess electricity, and release the stored electricity to power the system's electrical equipment when the power generation device generates insufficient electricity; the storage battery connects the power generation device and the system's electrical equipment through a power pipeline, the storage battery is connected to the cross-seasonal heat storage and heating subsystem through an electric boiler and a heat pump, the storage battery is connected to the wind and solar absorption and power supply subsystem through a photovoltaic module and a wind turbine, and the storage battery is connected to the geothermal heating pump and the geothermal heating subsystem through relevant circulating water pumps, and the relevant circulating water pumps include a first circulating water pump, a second circulating water pump, a third circulating water pump and a fourth circulating water pump.

4. The cross-seasonal heat storage and geothermal coupled heating system based on wind and solar power consumption according to claim 1 is characterized in that: The inter-seasonal heat storage and heating subsystem includes: An electric boiler is connected to the inter-seasonal hot water storage tank, and the electric boiler converts electrical energy into thermal energy to heat the water in the pipeline and then transmits the heat to the inter-seasonal hot water storage tank for heat storage; The constant pressure water supply device is connected to the cross-seasonal heat storage tank through the electric boiler to supply the system pipeline with softened water at a constant pressure; The inter-seasonal hot water storage tank is installed between the heat exchanger and the electric boiler; Buffer water tank, installed between the heat user and the heat pump.

5. The cross-seasonal heat storage and geothermal coupled heating system based on wind and solar power consumption according to claim 1 is characterized in that: The system also includes a prediction control module for predicting the amount of power wasted in the heating system using the GRU power wasted prediction model, and intelligently regulating the coordinated operation of the geothermal heating subsystem, the wind and solar power consumption subsystem, and the inter-seasonal heat storage heating subsystem based on the prediction results.

6. The cross-seasonal heat storage and geothermal coupled heating system based on wind and solar power consumption according to claim 5 is characterized in that: The method of using the GRU power curtailment prediction model to predict the power curtailment of the heating system and intelligently regulating the coordinated operation of the geothermal heating subsystem, the wind and solar power consumption subsystem, and the inter-seasonal heat storage heating subsystem according to the prediction results specifically includes the following steps: a. Normalize the historical data of wind and solar power generation and environmental parameters according to formula (1); in, For the t Moment i dimensional original input data, and are the mean and standard deviation of the corresponding features of the training set, d The input dimensions include wind speed, irradiance, ambient temperature and historical power curtailment. b. Define the update gate of GRU according to formula (2) and reset gate : in, and is the weight matrix, and is the bias term, is the Sigmoid activation function, Indicates the historical state, x t is the current input; c. Generate candidate states and update hidden states according to formulas (3) and (4) respectively; Generate candidate states in, represents element-wise multiplication, tanh (*) is the hyperbolic tangent function, is the weight matrix, Indicates the current candidate status; Update hidden state in, represents the final hidden state; d. Use the fully connected layer to map the hidden state to the predicted value of power curtailment according to formula (5), and output the predicted value of power curtailment; in, is the output weight, is the bias term, For the t The amount of curtailment predicted at any given moment; e. Forecasted power abandonment in the inter-seasonal heat storage and heating subsystem When the electric boiler is started to consume the abandoned electricity and store heat, the power setting is: in, is the maximum power of the electric boiler; f. The geothermal heating subsystem dynamically adjusts the geothermal pump output according to the prediction results of step d and formula (11) to prevent over-extraction of rock and soil; in, Contribute to geothermal foundation, In adjustable increments.

7. The cross-seasonal heat storage and geothermal coupled heating system based on wind and solar power consumption according to claim 6 is characterized in that: The prediction control module also includes an optimization module for correcting the parameters of the GRU power curtailment prediction model according to the power curtailment prediction error, specifically including the following steps: g. Calculate the prediction error of abandoned power based on the predicted value of abandoned power , and model the distribution of the curtailment prediction error, assuming that the prediction residual follows a normal distribution: h. Calculate the distribution parameters by maximum likelihood estimation: in, is the number of training samples, Error The estimated mean of , reflecting the central tendency of the error, Representation error The estimated variance of Around the mean The degree of dispersion; i. Generated using Latin hypercube sampling M Each scenario has a power curtailment error scenario. s The error is: in, is the inverse cumulative function of the standard normal distribution, For stratified random indexing, generate stratified random samples covering the forecast error distribution; j. Synchronous back-generation reduction defines the distance metric between scenes: Iteratively merge the scene pairs with the smallest distance until the number of remaining scenes is K satisfy K ≤ K max , obtain the reduced number of scenarios, analyze the prediction error accuracy and causes based on the reduced number of scenarios, and then modify the prediction model.

8. A method for controlling inter-seasonal heat storage and geothermal coupled heating based on wind and solar power consumption, used in the inter-seasonal heat storage and geothermal coupled heating system based on wind and solar power consumption according to any one of claims 1 to 7, characterized in that: The method comprises: S1: The wind and solar power consumption subsystem converts abandoned wind and solar power into electrical energy; S2: Powering the system electrical equipment with the converted electric energy, and determining whether the power generated by the wind-solar power consumption subsystem is greater than the load of the system electrical equipment; S3: If yes, the excess electricity generated by the power generation device is preferentially supplied to the constant pressure water supply pump and the electric boiler to maintain the water temperature in the inter-seasonal hot water storage tank, and the excess electricity is then stored in the storage battery; otherwise, the power generation device and the storage device jointly supply power to the system electrical equipment; S4: the inter-seasonal heat storage and heating subsystem stores heat in the inter-seasonal heat storage tank to provide heat to heat users during the heating season, and determines whether the temperature in the inter-seasonal heat storage tank is greater than the heating temperature; S5: If yes, the heat energy in the inter-seasonal hot water storage tank is transferred to the buffer water tank; otherwise, the water in the inter-seasonal hot water storage tank is regarded as a low-temperature heat source and heated by the heat pump before being transferred to the buffer water tank; S6: The buffer water tank supplies heat energy to heat users through the heat storage heating pump; S7: The geothermal heating subsystem extracts heat energy from the geothermal water through the second heat exchanger and supplies heat to the heat user through the geothermal heating pump, and determines whether the geothermal water outlet temperature is greater than the heating temperature. If so, the geothermal water is delivered to the heat user.

9. The method for controlling cross-seasonal heat storage and geothermal coupled heating based on wind and solar power consumption according to claim 8, wherein step S7 specifically comprises: During the heating season, the geothermal heating subsystem extracts the heat energy from the geothermal water through the second heat exchanger and supplies heat to the heat users through the geothermal heating pump, and determines whether the geothermal water outlet temperature is greater than the heating temperature. If so, the geothermal water is transported to the heat users; during the non-heating season, the water in the cross-seasonal heat storage tank is pumped by the fourth circulating water pump through the third heat exchanger to replenish the heat to the recharge well for geothermal heating.

Images