A photovoltaic power generation and gravity energy storage collaborative system

Abstract

The application discloses a photovoltaic power generation and gravity energy storage collaborative system and relates to the technical field of electric energy collaborative control, comprising the following modules: a photovoltaic power supply and load judgment module, which acquires a total historical electric quantity of photovoltaic power generation, acquires a total historical electric quantity of user load, obtains a residual electric quantity prediction result through the total historical electric quantity of photovoltaic power generation and the total historical electric quantity of user load, and judges whether a photovoltaic electric energy excess storage control module or an energy storage collaborative power supply module is executed according to the residual electric quantity prediction result; a storage battery group is established as an electric quantity buffer storage area, the charging and discharging frequency of the storage battery in the near future and the power consumption condition each time are judged according to the charging and discharging historical data of the storage battery group, so that whether the photovoltaic electric quantity in the near future is more inclined to be sufficient to meet the user demand or is always insufficient to meet the user demand can be conveniently judged.

Description

Technical Field

[0001] This invention relates to the field of power synergy control technology, specifically a photovoltaic power generation and gravity energy storage synergy system. Background Technology

[0002] Photovoltaic power generation and gravity energy storage are an ideal "green partnership." Photovoltaic power generation uses solar panels to directly convert sunlight into electricity, but its power generation is intermittent and unstable. There is a surplus of electricity during the day when there is plenty of sunlight, but no power can be generated at night. Gravity energy storage cleverly solves this problem. When there is a surplus of electricity, it uses photovoltaic power to lift heavy objects to a high place and convert the electrical energy into gravitational potential energy for storage. When night falls or the grid needs it, the heavy objects are released and fall to drive a generator to convert the potential energy back into reliable power output. This synergistic system is like equipping photovoltaics with a huge "green power bank," effectively smoothing power fluctuations and achieving a stable and on-demand supply of clean energy. It is one of the important technical paths for building a new type of power system. When photovoltaic power generation is lower than the user load, there are many problems in directly converting gravity energy storage into electricity to supply users. For example, the start-up cycle of converting gravity energy storage into electricity is long, making it difficult to achieve instantaneous energy conversion. The quality of electricity is uncontrollable when gravity energy storage is converted into electricity, with large fluctuations in current and voltage. Directly supplying electricity to users poses a risk of damaging circuits. When photovoltaic power generation exceeds user load, the electricity is first converted into gravity energy storage. When electricity is needed, it is then converted back into electricity through gravity energy storage. Although this method of electricity conversion and storage is convenient, the energy loss during the conversion process is large and it is not suitable for frequent storage. In order to facilitate the coordinated control of electricity during the process of photovoltaic power generation and gravity energy storage to supply electricity to users, reduce energy loss, and improve the stability of power supply to users, we propose a photovoltaic power generation and gravity energy storage collaborative system. Summary of the Invention

[0003] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a photovoltaic power generation and gravity energy storage synergistic system to solve the aforementioned problems in the prior art.

[0004] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a photovoltaic power generation and gravity energy storage synergistic system, comprising the following modules: The photovoltaic power supply and load judgment module obtains the historical total power of photovoltaic power generation and the historical total power of user load. It obtains the remaining power prediction result by combining the historical total power of photovoltaic power generation and the historical total power of user load. Based on the remaining power prediction result, it determines whether to execute the photovoltaic power excess storage control module or the energy storage collaborative power supply module. The photovoltaic excess energy storage control module establishes a battery bank, acquires historical charging and discharging data of the battery bank, and selects the direction of photovoltaic excess energy storage based on the historical charging and discharging data of the battery bank and the remaining power of the battery bank. The photovoltaic power and energy storage co-power supply module supplies power to users through the collaboration of battery packs and photovoltaic power, and supplies power to the battery packs through gravity energy storage. The gravity energy storage stability judgment module acquires the current and voltage of the gravity energy storage power supply during the process of gravity supplying power to the battery pack. It obtains the stability value of the gravity energy storage power supply through the current and voltage of the gravity energy storage power supply, determines whether the gravity energy storage can directly supply power to the user based on the stability value of the gravity energy storage power supply, and switches the cooperative power supply mode according to the judgment result.

[0005] Preferably, in the photovoltaic power supply and load judgment module, the historical total power generation of photovoltaic power generation and the historical total power generation of user load are obtained. The remaining power prediction result is obtained by combining the historical total power generation of photovoltaic power generation and the historical total power generation of user load. Specifically: Step 1: Obtain the historical total power generation of photovoltaic power generation, set the judgment period, obtain the historical total power generation of photovoltaic power generation of the four judgment periods up to the current time according to the judgment period, mark it as the reference power supply, and obtain three power supply difference values ​​by subtracting the reference power supply of the next judgment period from the reference power supply of the previous judgment period. Sum the three power supply difference values ​​and take the average value to obtain the average change power supply. Obtain the total photovoltaic power generation of the current time, and obtain the predicted power supply by summing the total photovoltaic power generation of the current time with the average change power supply. Step 2: Obtain the historical total electricity consumption of users. Based on the judgment period, obtain the historical total electricity consumption of users in the four judgment periods up to the current time and mark it as the reference electricity consumption. Subtract the reference electricity consumption of the next judgment period from the reference electricity consumption of the previous judgment period to obtain three electricity consumption difference values. Sum the three electricity consumption difference values ​​and take the average value to obtain the average change electricity consumption. Obtain the total electricity consumption of users at the current time. Summing the total electricity consumption of users at the current time with the average change electricity consumption yields the predicted electricity consumption. Step 3: Obtain the total power difference by subtracting the predicted power supply from the predicted power consumption. Set a preset threshold for the total power difference and determine whether the total power difference is greater than the preset threshold. If the total power difference is greater than the preset threshold, the remaining power prediction result is marked as 1. If the total power difference is less than or equal to the preset threshold, the remaining power prediction result is marked as 0.

[0006] Preferably, in the photovoltaic power supply and load judgment module, the photovoltaic power excess storage control module or the energy storage collaborative power supply module is executed based on the remaining power prediction result. Specifically, the remaining power prediction result is obtained. If the remaining power prediction result is 1, the photovoltaic power excess storage control module is executed. If the remaining power prediction result is 0, the photovoltaic power and energy storage collaborative power supply module is executed.

[0007] Preferably, in the photovoltaic excess energy storage control module, the direction of photovoltaic excess energy storage is selected based on the battery pack's charging and discharging history data and the remaining battery capacity. Specifically: Step 1: Obtain historical charging and discharging data of the battery pack. Obtain the total duration of the battery assisting photovoltaic power generation to supply power to users in the seven days up to today through the historical charging and discharging data of the battery pack. Mark it as the total assistance duration. Obtain the total number of times the battery assists photovoltaic power generation to supply power to users in the seven days up to today through the historical charging and discharging data of the battery pack. Mark it as the total number of assistance. Obtain the average assistance duration by dividing the total assistance duration by the total number of assistance. Step 2: Set a preset threshold for the average duration of assistance, and determine whether the average duration of assistance is greater than the preset threshold. If the average duration of assistance is greater than or equal to the preset threshold, proceed to Step 3. If the average duration of assistance is less than the preset threshold, input the excess photovoltaic energy into the gravity energy storage. Step 3: Obtain the remaining power of the battery pack and determine whether the remaining power of the battery pack is less than 40%. If the remaining power of the battery pack is less than or equal to 40%, the excess photovoltaic energy will be stored in the battery pack. If the remaining power of the battery pack is greater than 90%, the excess photovoltaic energy will be stored in the gravity energy storage.

[0008] Preferably, in the photovoltaic power and energy storage co-power supply module, power is supplied to the user through the coordinated operation of the battery pack and photovoltaic power, and power is supplied to the battery pack through gravity energy storage, specifically as follows: Step 4: Obtain the predicted power supply and predicted power consumption, and obtain the required power difference by taking the absolute value of the difference between the predicted power supply and predicted power consumption. Step 5: Obtain the remaining power of the battery pack, set the power tolerance preset threshold, and obtain the safe power of the battery pack by summing the remaining power of the battery pack with the power tolerance preset threshold; Step Six: Determine whether the safe charge of the battery pack is greater than the required charge difference. If the safe charge of the battery pack is greater than the required charge difference, the battery pack and photovoltaic power will work together to supply power to the user. If the safe charge of the battery pack is less than or equal to the required charge difference, the battery pack and photovoltaic power will work together to supply power to the user, while gravity energy storage will supply power to the battery pack.

[0009] Preferably, in the gravity energy storage stability judgment module, the stability value of the gravity energy storage power supply is obtained by measuring the current and voltage of the gravity energy storage power supply, specifically as follows: Step 1: Set a monitoring cycle. Based on the monitoring cycle, acquire the current supplied to the battery pack by gravity energy storage and mark it as the reference current. Arrange the ten reference currents up to the current time in order of acquisition time from oldest to newest. Obtain multiple current differences by subtracting the reference current of the next monitoring cycle from the reference current of the previous monitoring cycle. Sum the nine current differences and take the average to obtain the mean current difference. Mark the maximum value among the nine current differences as the current difference extreme value. Obtain the current difference fluctuation range by using the mean current difference as the minimum value and the current difference extreme value as the maximum value. Set a preset threshold for the safe range of current difference fluctuation. Determine whether the current difference fluctuation range is within the preset threshold. If the current difference fluctuation range is within the preset threshold, mark the judgment result as a current stability value of 1. If the current difference fluctuation range is not within the preset threshold, mark the judgment result as a current stability value of 0. Step 2: Obtain the voltage supplied to the battery pack by gravity energy storage according to the monitoring cycle and mark it as the reference voltage. Arrange the ten reference voltages up to the current time in order of acquisition time from oldest to newest. Obtain multiple voltage differences by subtracting the reference voltage of the next monitoring cycle from the reference voltage of the previous monitoring cycle. Sum the nine voltage differences and take the average value to obtain the average voltage difference. Mark the maximum value among the nine voltage differences as the voltage difference extreme value. Obtain the voltage difference fluctuation range by using the average voltage difference as the minimum value and the voltage difference extreme value as the maximum value. Set a preset threshold for the safe range of voltage difference fluctuation. Determine whether the voltage difference fluctuation range is within the preset threshold. If the voltage difference fluctuation range is within the preset threshold, mark the judgment result as a voltage stability value of 1. If the voltage difference fluctuation range is not within the preset threshold, mark the judgment result as a voltage stability value of 0. Step 3: Obtain the stable current and voltage values, and sum the stable current and voltage values ​​to obtain the stable value of gravity energy storage power supply.

[0010] Preferably, in the gravity energy storage stability judgment module, the stability value of gravity energy storage power supply is used to determine whether gravity energy storage can directly supply power to users, specifically as follows: Step 3: Obtain the current stable value of gravity energy storage power supply, and determine whether the current stable value of gravity energy storage power supply is 0. If the current stable value of gravity energy storage power supply is 0, proceed to step 4. If the current stable value of gravity energy storage power supply is not 0, the result is that power cannot be directly supplied to the user. Step 4: Obtain the three most stable gravity energy storage power supply values ​​up to the current time and mark them as reference stable values. Determine if all three reference stable values ​​are 0. If all three reference stable values ​​are 0, the result is that power can be directly supplied to the user. If all three reference stable values ​​are not 0, repeat Step 1.

[0011] Preferably, in the gravity energy storage stability judgment module, the collaborative power supply mode is switched according to the judgment result. Specifically, the judgment result is obtained. If the judgment result is that power can be directly supplied to the user, the current collaborative power supply mode is obtained. If the current collaborative power supply mode is that the battery pack and photovoltaic power supply the user together, the collaborative power supply mode of the battery pack and photovoltaic power supply the user together is switched to that of gravity energy storage and photovoltaic power supply the user together. If the current collaborative power supply mode is that the collaborative power supply mode of gravity energy storage and photovoltaic power supply the user together, the collaborative power supply mode is not switched. If the judgment result is that power cannot be directly supplied to the user, the current collaborative power supply mode is obtained. If the current collaborative power supply mode is that the battery pack and photovoltaic power supply the user together, the collaborative power supply mode is not switched. If the current collaborative power supply mode is that gravity energy storage and photovoltaic power supply the user together, the collaborative power supply mode is switched to that of the battery pack and photovoltaic power supply.

[0012] (III) Beneficial Effects This invention provides a photovoltaic power generation and gravity energy storage synergistic system, which has the following beneficial effects: This solution establishes a battery bank as a power buffer storage area. Based on the battery bank's charging and discharging history data, it determines the recent charging and discharging frequency and power consumption patterns. This helps determine whether the recent photovoltaic power output is more likely to meet user needs or consistently insufficient. If it's more likely to meet user needs, excess photovoltaic power can be transferred to gravity storage for long-term storage. If it's more likely to be insufficient, excess photovoltaic power is preferentially transferred to the battery bank for storage. This leverages the advantages of gravity storage—facilitating long-term storage and minimizing losses—and avoids frequent energy transfer between the battery bank and gravity storage, preventing power loss. The remaining power in the battery bank ensures a continuous supply of emergency power to users, mitigating the slow conversion efficiency of gravity storage when photovoltaic power is insufficient. This helps prevent power outages and improves the user experience.

[0013] This solution monitors the current and voltage during gravity-driven power supply to the battery bank, facilitating the assessment of the stability of gravity-based energy conversion. This allows for adjustments to the gravity potential energy discharge mode based on stability assessments, and also helps determine whether the gravity-based energy storage discharge state is suitable for direct power supply to users. This avoids the need for power to be transferred to users only via the battery bank, minimizing energy transfer losses and reducing battery bank operating time, thus extending battery bank lifespan. When photovoltaic power cannot meet user demand, the solution intelligently switches between gravity-based energy storage and battery bank-based power supply based on power stability assessments. This ensures user power needs are met while minimizing energy transfer losses, and also avoids the risk of line damage caused by unstable, fluctuating gravity-converted energy being directly supplied to users. Furthermore, it reduces battery bank operating time and extends battery bank lifespan. Attached Figure Description

[0014] Figure 1 This is a flowchart of a photovoltaic power generation and gravity energy storage synergistic system according to the present invention; Figure 2 This is a schematic diagram of the modular structure of a photovoltaic power generation and gravity energy storage synergistic system according to the present invention. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Please see Figures 1-2 This invention provides a photovoltaic power generation and gravity energy storage synergistic system, comprising the following modules: The photovoltaic power supply and load judgment module obtains the historical total power of photovoltaic power generation and the historical total power of user load. It obtains the remaining power prediction result by combining the historical total power of photovoltaic power generation and the historical total power of user load. Based on the remaining power prediction result, it determines whether to execute the photovoltaic power excess storage control module or the energy storage collaborative power supply module. The photovoltaic excess energy storage control module establishes a battery bank, acquires historical charging and discharging data of the battery bank, and selects the direction of photovoltaic excess energy storage based on the historical charging and discharging data of the battery bank and the remaining power of the battery bank. The photovoltaic power and energy storage co-power supply module supplies power to users through the collaboration of battery packs and photovoltaic power, and supplies power to the battery packs through gravity energy storage. The gravity energy storage stability judgment module acquires the current and voltage of the gravity energy storage power supply during the process of gravity supplying power to the battery pack. It obtains the stability value of the gravity energy storage power supply through the current and voltage of the gravity energy storage power supply, determines whether the gravity energy storage can directly supply power to the user based on the stability value of the gravity energy storage power supply, and switches the cooperative power supply mode according to the judgment result.

[0017] In this embodiment, the photovoltaic power supply and load judgment module predicts the power supply of photovoltaic power generation by using the historical total power generation of photovoltaic power generation and the historical total power generation of user load. The prediction result of the remaining power generation determines whether the power generation of photovoltaic power generation can meet the user's power demand. This facilitates subsequent determination based on the prediction result of the remaining power generation whether to store the excess power or to supply power to the user in conjunction with gravity energy storage or battery packs. This solution establishes a battery bank as a power buffer storage area within the photovoltaic power excess storage control module. Based on the battery bank's charging and discharging history data, it determines the recent charging and discharging frequency and power consumption patterns. This helps determine whether the recent photovoltaic power supply is more likely to meet user needs or consistently insufficient. If it's more likely to meet user needs, the excess photovoltaic power can be transferred to gravity storage for long-term storage. If it's more likely to be insufficient, the excess photovoltaic power is preferentially transferred to the battery bank for storage. This leverages the advantages of gravity storage—facilitating long-term storage with low losses—and avoids power loss caused by frequent energy conversion between the battery bank and gravity storage. The remaining power in the battery bank ensures a continuous supply of emergency power to users, thus mitigating the slow conversion efficiency of gravity storage when photovoltaic power is insufficient. This helps prevent power outages and improves the user experience. In this solution, when photovoltaic power is insufficient to meet user needs in the photovoltaic and energy storage co-power supply module, power is first supplied to the user through the battery and photovoltaic power in tandem, and power is supplied from gravity energy storage to the battery. This helps to avoid the problem of slow start-up of gravity energy storage power supply, and also helps to avoid the phenomenon of unstable gravity energy storage power quality directly supplying power to users and causing line damage. It establishes a safety barrier between the power station and the user. The discharge mode of gravity energy storage can be adjusted directly by monitoring the charging status of the battery pack, thus avoiding the disadvantage of unstable power supply from gravity energy storage to users. This solution monitors the current and voltage states during the gravity energy storage stability assessment module to determine the stability of gravity energy storage power conversion. This allows for adjustments to the gravity potential energy discharge mode based on the stability assessment results. It also helps determine whether the gravity energy storage discharge state can directly supply power to users, thus avoiding the need for power to be transferred to users only through the battery pack. This reduces power transfer losses and shortens the battery pack's operating time, extending its lifespan. When photovoltaic power cannot meet user demand, the solution intelligently switches between gravity energy storage and battery pack power supply based on the power supply stability assessment. This ensures user power needs are met while reducing power transfer losses. It also avoids the risk of line damage caused by unstable and volatile gravity energy directly supplying users, further reducing battery pack operating time and extending its lifespan. It is worth mentioning that the value of the preset threshold in this scheme can be obtained through weight analysis, which will not be elaborated on here.

[0018] In the photovoltaic power supply and load assessment module, the historical total power generation of photovoltaic power generation and the historical total power generation of user load are obtained. The remaining power prediction result is obtained by combining the historical total power generation of photovoltaic power generation and the historical total power generation of user load. Specifically: Step 1: Obtain the historical total power generation of photovoltaic power generation, set the judgment period, obtain the historical total power generation of photovoltaic power generation of the four judgment periods up to the current time according to the judgment period, mark it as the reference power supply, and obtain three power supply difference values ​​by subtracting the reference power supply of the next judgment period from the reference power supply of the previous judgment period. Sum the three power supply difference values ​​and take the average value to obtain the average change power supply. Obtain the total photovoltaic power generation of the current time, and obtain the predicted power supply by summing the total photovoltaic power generation of the current time with the average change power supply. Step 2: Obtain the historical total electricity consumption of users. Based on the judgment period, obtain the historical total electricity consumption of users in the four judgment periods up to the current time and mark it as the reference electricity consumption. Subtract the reference electricity consumption of the next judgment period from the reference electricity consumption of the previous judgment period to obtain three electricity consumption difference values. Sum the three electricity consumption difference values ​​and take the average value to obtain the average change electricity consumption. Obtain the total electricity consumption of users at the current time. Summing the total electricity consumption of users at the current time with the average change electricity consumption yields the predicted electricity consumption. Step 3: Obtain the total power difference by subtracting the predicted power supply from the predicted power consumption. Set a preset threshold for the total power difference. Determine whether the total power difference is greater than the preset threshold. If the total power difference is greater than the preset threshold, the remaining power prediction result is marked as 1. If the total power difference is less than or equal to the preset threshold, the remaining power prediction result is marked as 0. In the photovoltaic power supply and load judgment module, the system determines whether to execute the photovoltaic excess energy storage control module or the energy storage collaborative power supply module based on the remaining power prediction result. Specifically, the remaining power prediction result is obtained. If the remaining power prediction result is 1, the photovoltaic excess energy storage control module is executed. If the remaining power prediction result is 0, the photovoltaic and energy storage collaborative power supply module is executed.

[0019] In this embodiment, the power supply of photovoltaic power generation is predicted by combining the historical total power generation of photovoltaic power generation with the historical total power generation of user load. The prediction result of the remaining power generation is used to determine whether the power generation of photovoltaic power generation can meet the user's power demand. This makes it easier to determine whether to store the excess power or to supply power to the user in conjunction with gravity energy storage or battery packs based on the prediction result of the remaining power generation. By setting a preset threshold for the total power generation with a positive value, the prediction result of the remaining power generation can be judged more conservatively. This makes it easier to use coordinated power supply when the predicted power supply is slightly higher than the predicted power consumption, thereby helping to avoid power outages caused by inaccurate prediction results.

[0020] In the photovoltaic excess energy storage control module, the direction of photovoltaic excess energy storage is selected based on the battery pack's charging and discharging history data and the remaining battery capacity. Specifically: Step 1: Obtain historical charging and discharging data of the battery pack. Obtain the total duration of the battery assisting photovoltaic power generation to supply power to users in the seven days up to today through the historical charging and discharging data of the battery pack. Mark it as the total assistance duration. Obtain the total number of times the battery assists photovoltaic power generation to supply power to users in the seven days up to today through the historical charging and discharging data of the battery pack. Mark it as the total number of assistance. Obtain the average assistance duration by dividing the total assistance duration by the total number of assistance. Step 2: Set a preset threshold for the average duration of assistance, and determine whether the average duration of assistance is greater than the preset threshold. If the average duration of assistance is greater than or equal to the preset threshold, proceed to Step 3. If the average duration of assistance is less than the preset threshold, input the excess photovoltaic energy into the gravity energy storage. Step 3: Obtain the remaining power of the battery pack and determine whether the remaining power of the battery pack is less than 40%. If the remaining power of the battery pack is less than or equal to 40%, the excess photovoltaic energy will be stored in the battery pack. If the remaining power of the battery pack is greater than 90%, the excess photovoltaic energy will be stored in the gravity energy storage.

[0021] In this embodiment, a battery bank is established as a power buffer storage area. Based on the charging and discharging history data of the battery bank, the recent charging and discharging frequency and power consumption of the battery are determined. This helps to determine whether the recent photovoltaic power is more likely to meet user needs or is consistently insufficient. If it is more likely to meet user needs, the excess photovoltaic power can be transferred to gravity energy storage for long-term storage. If it is more likely to be insufficient, the excess photovoltaic power is preferentially transferred to the battery bank for storage. This leverages the advantages of gravity energy storage, which is convenient for long-term storage and has low loss, and avoids the loss of power caused by frequent conversion between the battery bank and gravity energy storage. The remaining power in the battery bank ensures that there is always emergency power available to supply users. This helps to avoid the slow conversion efficiency of gravity energy storage when photovoltaic power is insufficient, thus helping to prevent power outages and improve the user experience.

[0022] In the photovoltaic power and energy storage co-power supply module, power is supplied to users through the coordinated operation of battery banks and photovoltaic power, while gravity energy storage supplies power to the battery banks. Specifically: Step 4: Obtain the predicted power supply and predicted power consumption, and obtain the required power difference by taking the absolute value of the difference between the predicted power supply and predicted power consumption. Step 5: Obtain the remaining power of the battery pack, set the power tolerance preset threshold, and obtain the safe power of the battery pack by summing the remaining power of the battery pack with the power tolerance preset threshold; Step Six: Determine whether the safe charge of the battery pack is greater than the required charge difference. If the safe charge of the battery pack is greater than the required charge difference, the battery pack and photovoltaic power will work together to supply power to the user. If the safe charge of the battery pack is less than or equal to the required charge difference, the battery pack and photovoltaic power will work together to supply power to the user, while gravity energy storage will supply power to the battery pack.

[0023] In this embodiment, when the photovoltaic power is insufficient to meet the user's needs, the power is first supplied to the user through the collaboration of the battery and the photovoltaic power, and power is supplied from the gravity energy storage to the battery. This helps to avoid the problem of slow start-up of gravity energy storage power supply, and also helps to avoid the phenomenon of line damage caused by the unstable power quality of gravity energy storage directly supplying power to the user. This establishes a safety barrier between the power station and the user. The discharge mode of gravity energy storage can be adjusted directly by monitoring the charging status of the battery pack, thus avoiding the disadvantage of unstable power supply from gravity energy storage to the user.

[0024] In the gravity energy storage stability assessment module, the stability value of the gravity energy storage power supply is obtained by measuring the current and voltage of the gravity energy storage power supply. Specifically: Step 1: Set a monitoring cycle. Based on the monitoring cycle, acquire the current supplied to the battery pack by gravity energy storage and mark it as the reference current. Arrange the ten reference currents up to the current time in order of acquisition time from oldest to newest. Obtain multiple current differences by subtracting the reference current of the next monitoring cycle from the reference current of the previous monitoring cycle. Sum the nine current differences and take the average to obtain the mean current difference. Mark the maximum value among the nine current differences as the current difference extreme value. Obtain the current difference fluctuation range by using the mean current difference as the minimum value and the current difference extreme value as the maximum value. Set a preset threshold for the safe range of current difference fluctuation. Determine whether the current difference fluctuation range is within the preset threshold. If the current difference fluctuation range is within the preset threshold, mark the judgment result as a current stability value of 1. If the current difference fluctuation range is not within the preset threshold, mark the judgment result as a current stability value of 0. Step 2: Obtain the voltage supplied to the battery pack by gravity energy storage according to the monitoring cycle and mark it as the reference voltage. Arrange the ten reference voltages up to the current time in order of acquisition time from oldest to newest. Obtain multiple voltage differences by subtracting the reference voltage of the next monitoring cycle from the reference voltage of the previous monitoring cycle. Sum the nine voltage differences and take the average value to obtain the average voltage difference. Mark the maximum value among the nine voltage differences as the voltage difference extreme value. Obtain the voltage difference fluctuation range by using the average voltage difference as the minimum value and the voltage difference extreme value as the maximum value. Set a preset threshold for the safe range of voltage difference fluctuation. Determine whether the voltage difference fluctuation range is within the preset threshold. If the voltage difference fluctuation range is within the preset threshold, mark the judgment result as a voltage stability value of 1. If the voltage difference fluctuation range is not within the preset threshold, mark the judgment result as a voltage stability value of 0. Step 3: Obtain the stable current and voltage values, and sum the stable current and voltage values ​​to obtain the stable value of gravity energy storage power supply.

[0025] In this embodiment, by monitoring the current and voltage states during the process of gravity supplying power to the battery pack, it is easy to determine the stability of gravity energy storage power conversion. This facilitates the adjustment of the gravity potential energy discharge mode based on the stability assessment results, and also helps to determine whether the discharge state of gravity energy storage can directly supply power to the user. This helps to avoid the need for power to be transferred to the user only through the battery pack, avoids power transfer losses, reduces the working time of the battery pack, and extends the service life of the battery pack.

[0026] In the gravity energy storage stability assessment module, the stability value of gravity energy storage power supply is used to determine whether gravity energy storage can directly supply power to users. Specifically: Step 3: Obtain the current stable value of gravity energy storage power supply, and determine whether the current stable value of gravity energy storage power supply is 0. If the current stable value of gravity energy storage power supply is 0, proceed to step 4. If the current stable value of gravity energy storage power supply is not 0, the result is that power cannot be directly supplied to the user. Step 4: Obtain the three most stable gravity energy storage power supply values ​​up to the current time, mark them as reference stable values, and determine whether all three reference stable values ​​are 0. If all three reference stable values ​​are 0, the result is that power can be directly supplied to users. If all three reference stable values ​​are not 0, repeat step 1. In the gravity energy storage stability judgment module, the collaborative power supply mode is switched according to the judgment result. Specifically, the judgment result is obtained. If the judgment result is that power can be directly supplied to the user, the current collaborative power supply mode is obtained. If the current collaborative power supply mode is that the battery pack and photovoltaic power supply the user together, the collaborative power supply mode of the battery pack and photovoltaic power supply the user together is switched to that of gravity energy storage and photovoltaic power supply the user together. If the current collaborative power supply mode is that the collaborative power supply mode of gravity energy storage and photovoltaic power supply the user together, the collaborative power supply mode is not switched. If the judgment result is that power cannot be directly supplied to the user, the current collaborative power supply mode is obtained. If the current collaborative power supply mode is that the battery pack and photovoltaic power supply the user together, the collaborative power supply mode is not switched. If the current collaborative power supply mode is that gravity energy storage and photovoltaic power supply the user together, the collaborative power supply mode is switched to that of the battery pack and photovoltaic power supply.

[0027] In this embodiment, when photovoltaic power cannot meet the user's power demand, intelligent switching is performed between gravity energy storage co-supplying the user and battery bank co-supplying the user based on the judgment result of the power supply stability value. This facilitates ensuring the user's power demand while reducing the loss of power transfer. It also avoids the risk of line damage caused by the large fluctuations and instability of the power converted from gravity energy storage being directly supplied to the user. Furthermore, it reduces the working time of the battery bank and facilitates extending the service life of the battery bank.

[0028] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented in software, the above embodiments can be implemented, in whole or in part, as a computer program product. Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution.

[0029] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0030] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A photovoltaic power generation and gravity energy storage synergistic system, characterized in that, Includes the following modules: The photovoltaic power supply and load judgment module obtains the historical total power of photovoltaic power generation and the historical total power of user load. It obtains the remaining power prediction result by combining the historical total power of photovoltaic power generation and the historical total power of user load. Based on the remaining power prediction result, it determines whether to execute the photovoltaic power excess storage control module or the energy storage collaborative power supply module. The photovoltaic excess energy storage control module establishes a battery bank, acquires historical charging and discharging data of the battery bank, and selects the direction of photovoltaic excess energy storage based on the historical charging and discharging data of the battery bank and the remaining power of the battery bank. The photovoltaic power and energy storage co-power supply module supplies power to users through the collaboration of battery packs and photovoltaic power, and supplies power to the battery packs through gravity energy storage. The gravity energy storage stability judgment module acquires the current and voltage of gravity energy storage power supply during the process of gravity supplying power to the battery pack, obtains the gravity energy storage power supply stability value through the current and voltage of gravity energy storage power supply, judges whether gravity energy storage can directly supply power to the user through the gravity energy storage power supply stability value, and switches the cooperative power supply mode according to the judgment result. In the gravity energy storage stability assessment module, the stability value of the gravity energy storage power supply is obtained by measuring the current and voltage of the gravity energy storage power supply. Specifically: Step 1: Set a monitoring cycle. Based on the monitoring cycle, acquire the current supplied to the battery pack by gravity energy storage and mark it as the reference current. Arrange the ten reference currents up to the current time in order of acquisition time from oldest to newest. Obtain multiple current differences by subtracting the reference current of the next monitoring cycle from the reference current of the previous monitoring cycle. Sum the nine current differences and take the average to obtain the mean current difference. Mark the maximum value among the nine current differences as the current difference extreme value. Obtain the current difference fluctuation range by using the mean current difference as the minimum value and the current difference extreme value as the maximum value. Set a preset threshold for the safe range of current difference fluctuation. Determine whether the current difference fluctuation range is within the preset threshold. If the current difference fluctuation range is within the preset threshold, mark the judgment result as a current stability value of 1. If the current difference fluctuation range is not within the preset threshold, mark the judgment result as a current stability value of 0. Step 2: Obtain the voltage supplied to the battery pack by gravity energy storage according to the monitoring cycle and mark it as the reference voltage. Arrange the ten reference voltages up to the current time in order of acquisition time from oldest to newest. Obtain multiple voltage differences by subtracting the reference voltage of the next monitoring cycle from the reference voltage of the previous monitoring cycle. Sum the nine voltage differences and take the average value to obtain the average voltage difference. Mark the maximum value among the nine voltage differences as the voltage difference extreme value. Obtain the voltage difference fluctuation range by using the average voltage difference as the minimum value and the voltage difference extreme value as the maximum value. Set a preset threshold for the safe range of voltage difference fluctuation. Determine whether the voltage difference fluctuation range is within the preset threshold. If the voltage difference fluctuation range is within the preset threshold, mark the judgment result as a voltage stability value of 1. If the voltage difference fluctuation range is not within the preset threshold, mark the judgment result as a voltage stability value of 0. Step 3: Obtain the stable current and voltage values, and sum the stable current and voltage values ​​to obtain the stable value of gravity energy storage power supply.

2. The photovoltaic power generation and gravity energy storage synergistic system according to claim 1, characterized in that: In the photovoltaic power supply and load assessment module, the historical total power generation of photovoltaic power generation and the historical total power generation of user load are obtained. The remaining power prediction result is obtained by combining the historical total power generation of photovoltaic power generation and the historical total power generation of user load. Specifically: Step 1: Obtain the historical total power generation of photovoltaic power generation, set the judgment period, obtain the historical total power generation of photovoltaic power generation of the four judgment periods up to the current time according to the judgment period, mark it as the reference power supply, and obtain three power supply difference values ​​by subtracting the reference power supply of the next judgment period from the reference power supply of the previous judgment period. Sum the three power supply difference values ​​and take the average value to obtain the average change power supply. Obtain the total photovoltaic power generation of the current time, and obtain the predicted power supply by summing the total photovoltaic power generation of the current time with the average change power supply. Step 2: Obtain the historical total electricity consumption of users. Based on the judgment period, obtain the historical total electricity consumption of users in the four judgment periods up to the current time and mark it as the reference electricity consumption. Subtract the reference electricity consumption of the next judgment period from the reference electricity consumption of the previous judgment period to obtain three electricity consumption difference values. Sum the three electricity consumption difference values ​​and take the average value to obtain the average change electricity consumption. Obtain the total electricity consumption of users at the current time. Summing the total electricity consumption of users at the current time with the average change electricity consumption yields the predicted electricity consumption. Step 3: Obtain the total power difference by subtracting the predicted power supply from the predicted power consumption. Set a preset threshold for the total power difference and determine whether the total power difference is greater than the preset threshold. If the total power difference is greater than the preset threshold, the remaining power prediction result is marked as 1. If the total power difference is less than or equal to the preset threshold, the remaining power prediction result is marked as 0.

3. The photovoltaic power generation and gravity energy storage synergistic system according to claim 1, characterized in that: In the photovoltaic power supply and load judgment module, the system determines whether to execute the photovoltaic excess energy storage control module or the energy storage collaborative power supply module based on the remaining power prediction result. Specifically, the remaining power prediction result is obtained. If the remaining power prediction result is 1, the photovoltaic excess energy storage control module is executed. If the remaining power prediction result is 0, the photovoltaic and energy storage collaborative power supply module is executed.

4. The photovoltaic power generation and gravity energy storage synergistic system according to claim 1, characterized in that: In the photovoltaic excess energy storage control module, the direction of photovoltaic excess energy storage is selected based on the battery pack's charging and discharging history data and the remaining battery capacity. Specifically: Step 1: Obtain historical charging and discharging data of the battery pack. Obtain the total duration of the battery assisting photovoltaic power generation to supply power to users in the seven days up to today through the historical charging and discharging data of the battery pack. Mark it as the total assistance duration. Obtain the total number of times the battery assists photovoltaic power generation to supply power to users in the seven days up to today through the historical charging and discharging data of the battery pack. Mark it as the total number of assistance. Obtain the average assistance duration by dividing the total assistance duration by the total number of assistance. Step 2: Set a preset threshold for the average duration of assistance, and determine whether the average duration of assistance is greater than the preset threshold. If the average duration of assistance is greater than or equal to the preset threshold, proceed to Step 3. If the average duration of assistance is less than the preset threshold, input the excess photovoltaic energy into gravity energy storage. Step 3: Obtain the remaining power of the battery pack and determine whether the remaining power of the battery pack is less than 40%. If the remaining power of the battery pack is less than or equal to 40%, the excess photovoltaic energy will be stored in the battery pack. If the remaining power of the battery pack is greater than 90%, the excess photovoltaic energy will be stored in the gravity energy storage.

5. A photovoltaic power generation and gravity energy storage synergistic system according to claim 2, characterized in that: In the photovoltaic power and energy storage co-power supply module, power is supplied to users through the coordinated operation of battery banks and photovoltaic power, and power is supplied to the battery banks through gravity energy storage. Specifically: Step 4: Obtain the predicted power supply and predicted power consumption, and obtain the required power difference by taking the absolute value of the difference between the predicted power supply and predicted power consumption. Step 5: Obtain the remaining power of the battery pack, set the power tolerance preset threshold, and obtain the safe power of the battery pack by summing the remaining power of the battery pack with the power tolerance preset threshold; Step Six: Determine whether the safe charge of the battery pack is greater than the required charge difference. If the safe charge of the battery pack is greater than the required charge difference, the battery pack and photovoltaic power will work together to supply power to the user. If the safe charge of the battery pack is less than or equal to the required charge difference, the battery pack and photovoltaic power will work together to supply power to the user, while gravity energy storage will supply power to the battery pack.

6. The photovoltaic power generation and gravity energy storage synergistic system according to claim 1, characterized in that: In the gravity energy storage stability assessment module, the stability value of gravity energy storage power supply is used to determine whether gravity energy storage can directly supply power to users. Specifically: Step 3: Obtain the current stable value of gravity energy storage power supply, and determine whether the current stable value of gravity energy storage power supply is 0. If the current stable value of gravity energy storage power supply is 0, proceed to step 4. If the current stable value of gravity energy storage power supply is not 0, the result is that power cannot be directly supplied to the user. Step 4: Obtain the three most stable gravity energy storage power supply values ​​up to the current time and mark them as reference stable values. Determine if all three reference stable values ​​are 0. If all three reference stable values ​​are 0, the result is that power can be directly supplied to the user. If all three reference stable values ​​are not 0, repeat Step 1.

7. A photovoltaic power generation and gravity energy storage synergistic system according to claim 6, characterized in that: In the gravity energy storage stability judgment module, the collaborative power supply mode is switched according to the judgment result. Specifically, the judgment result is obtained. If the judgment result is that power can be directly supplied to the user, the current collaborative power supply mode is obtained. If the current collaborative power supply mode is that the battery pack and photovoltaic power supply the user together, the collaborative power supply mode of the battery pack and photovoltaic power supply the user together is switched to that of gravity energy storage and photovoltaic power supply the user together. If the current collaborative power supply mode is that the collaborative power supply mode of gravity energy storage and photovoltaic power supply the user together, the collaborative power supply mode is not switched. If the judgment result is that power cannot be directly supplied to the user, the current collaborative power supply mode is obtained. If the current collaborative power supply mode is that the battery pack and photovoltaic power supply the user together, the collaborative power supply mode is not switched. If the current collaborative power supply mode is that gravity energy storage and photovoltaic power supply the user together, the collaborative power supply mode is switched to that of the battery pack and photovoltaic power supply.

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