Photovoltaic power generation and gravity energy storage cooperation system

Abstract

The invention discloses a photovoltaic power generation and gravity energy storage cooperative system, and relates to the technical field of electric energy cooperative control, and the system comprises the following modules: a photovoltaic power supply and load judgment module, which obtains the historical total electric quantity of photovoltaic power generation, obtains the historical total electric quantity of a user load, and obtains the load of the user; a residual electric quantity prediction result is obtained through the photovoltaic power generation historical total electric quantity and the user load historical total electric quantity, and whether the photovoltaic electric energy surplus storage control module or the energy storage cooperative power supply module is executed is judged according to the residual electric quantity prediction result; the storage battery pack is established as the electric quantity buffer storage area, and the charging and discharging frequency and each-time electricity consumption condition of the storage battery in the recent period are judged according to the charging and discharging historical data of the storage battery pack, so that whether the recent photovoltaic electric quantity tends to meet the user requirements sufficiently or not can be judged conveniently.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric energy collaborative control, in particular to a photovoltaic power generation and gravity energy storage collaborative system. BACKGROUND

[0002] Photovoltaic power generation and gravity energy storage are an ideal pair of "green partners". Photovoltaic power generation directly converts sunlight into electricity using solar panels, but its power generation is intermittent and unstable. There is excess power during the day when sunlight is abundant, and no power generation at night. Gravity energy storage cleverly solves this problem. When there is excess power, the photovoltaic power is used to lift heavy objects to a high place, converting the electricity into gravitational potential energy and storing it. When the night falls or the power grid needs it, the heavy objects are released to drive the generator to convert the potential energy back into reliable electricity output. This collaborative system is like a huge "green power bank" for photovoltaic power, effectively smoothing power fluctuations and achieving stable and on-demand supply of clean energy. It is one of the important technical paths for building a new power system. When the amount of photovoltaic power generation is lower than the user load, directly converting gravity energy storage into electricity to supply power to users has many problems. For example, the start-up period of converting gravity energy storage into electricity is long, making it difficult to achieve instantaneous energy conversion. The quality of electricity converted from gravity energy storage is uncontrollable, and the current and voltage fluctuate greatly, posing a risk of damaging the circuit when directly supplying power to users. When the amount of photovoltaic power generation is higher than the user load, the electricity is first converted into gravity energy storage for storage, and then converted into electricity when needed. This electricity conversion and storage method is convenient, but the energy loss during conversion is large, making it unsuitable for frequent storage. In order to facilitate the coordinated control of electricity during photovoltaic power generation and gravity energy storage to users, reduce energy loss, and improve the stability of user power supply, we propose a photovoltaic power generation and gravity energy storage collaborative system. SUMMARY

[0003] (I) Technical problems solved In view of the deficiencies in the prior art, the present application provides a photovoltaic power generation and gravity energy storage collaborative system to solve the above problems in the prior art.

[0004] (II) Technical solutions To achieve the above purpose, the present application is implemented by the following technical solutions: a photovoltaic power generation and gravity energy storage collaborative system, comprising the following modules: A photovoltaic power supply and load determination module obtains the total historical power generation of photovoltaic power generation, obtains the total historical power load of the user, obtains the remaining power prediction result from the total historical power generation of photovoltaic power generation and the total historical power load of the user, and determines whether to execute the photovoltaic power overcharge storage control module or the energy storage collaborative power supply module according to the remaining power prediction result. The photovoltaic power surplus storage control module establishes a battery pack, obtains battery pack charging and discharging historical data, and selects a photovoltaic surplus power storage direction through the battery pack charging and discharging historical data and the remaining power of the battery pack. The photovoltaic power and energy storage collaborative power supply module supplies power to users through the battery pack and photovoltaic power collaboration, and supplies power to the battery pack through gravity energy storage. The gravity energy storage stability judgment module obtains the current and voltage of the gravity energy storage power supply during the process of supplying power to the battery pack by gravity, obtains the gravity energy storage power supply stability value through the current and voltage of the gravity energy storage power supply, judges whether the gravity energy storage can directly supply power to users through the gravity energy storage power supply stability value, and switches the collaborative power supply mode according to the judgment result.

[0005] Preferably, in the photovoltaic power supply and load judgment module, the total historical power of photovoltaic power generation is obtained, the total historical power of user load is obtained, the remaining power prediction result is obtained through the total historical power of photovoltaic power generation and the total historical power of user load, and specifically: Step one: obtaining the total historical power of photovoltaic power generation, setting a judgment period, obtaining the total historical power of photovoltaic power generation of the previous four judgment periods until the current time according to the judgment period, marking as reference power supply, respectively, the reference power supply of the next judgment period and the reference power supply of the previous judgment period are subtracted to obtain three power supply difference values, the sum of the three power supply difference values is averaged to obtain the average change power supply, the total power of photovoltaic power generation at the current time is obtained, and the sum of the total power of photovoltaic power generation at the current time and the average change power supply is obtained. The predicted power supply is obtained by summing up the predicted power supply; Step two: obtaining the total historical power of user load, obtaining the total historical power of user load of the previous four judgment periods until the current time according to the judgment period, marking as reference power consumption, respectively, the reference power consumption of the next judgment period and the reference power consumption of the previous judgment period are subtracted to obtain three power consumption difference values, the sum of the three power consumption difference values is averaged to obtain the average change power consumption, the total power of user load at the current time is obtained, and the sum of the total power of user load at the current time and the average change power consumption is obtained. The predicted power consumption is obtained by summing up the predicted power consumption; Step three: the total power difference is obtained by subtracting the predicted power supply from the predicted power consumption, the total power difference preset threshold is set, it is judged whether the total power difference is greater than the total power difference preset threshold, if the total power difference is greater than the total power difference preset threshold, the remaining power prediction result is marked as 1, if the total power difference is less than or equal to the total power difference preset threshold, the remaining power prediction result is marked as 0.

[0006] Preferably, in the photovoltaic power supply and load judgment module, the remaining power prediction result is used to judge whether to execute the photovoltaic power surplus storage control module or the energy storage collaborative power supply module, specifically: the remaining power prediction result is obtained, if the remaining power prediction result is 1, the photovoltaic power surplus storage control module is executed, and 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 power surplus storage control module, the storage direction of the photovoltaic surplus power is selected through the battery pack charge and discharge historical data and the remaining power of the battery pack, specifically: Step one: obtain the battery pack charge and discharge historical data, obtain the total time length of the battery assisting photovoltaic power generation to supply power to the user within seven days by the battery pack charge and discharge historical data, mark it as the total time length of assistance, obtain the total number of times of the battery assisting photovoltaic power generation to supply power to the user within seven days by the battery pack charge and discharge historical data, mark it as the total number of times of assistance, and obtain the assistance average time length by taking the quotient of the total time length of assistance and the total number of times of assistance; Step two: set the assistance average time length preset threshold, judge whether the assistance average time length is greater than the assistance average time length preset threshold, if the assistance average time length is greater than or equal to the assistance average time length preset threshold, execute step three, if the assistance average time length is less than the assistance average time length preset threshold, input the photovoltaic surplus power into the gravity energy storage for storage; Step three: obtain the remaining power of the battery pack, judge whether the remaining power of the battery pack is less than forty percent, if the remaining power of the battery pack is less than or equal to forty percent, store the photovoltaic surplus power in the battery pack, if the remaining power of the battery pack is greater than ninety percent, store the photovoltaic surplus power in the gravity energy storage.

[0008] Preferably, in the photovoltaic power and energy storage collaborative power supply module, the battery pack and the photovoltaic power supply are used to supply power to the user, and the gravity energy storage is used to supply power to the battery pack, specifically: Step four: obtain the predicted power supply and the predicted power consumption, and obtain the required power difference by taking the absolute value of the difference between the predicted power consumption and the predicted power supply; Step five: 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 and the power tolerance preset threshold; Step six: judge whether the safe power of the battery pack is greater than the required power difference, if the safe power of the battery pack is greater than the required power difference, supply power to the user through the battery pack and the photovoltaic power together, if the safe power of the battery pack is less than or equal to the required power difference, supply power to the user through the battery pack and the photovoltaic power together while supplying power to the battery pack through the gravity energy storage.

[0009] Preferably, in the gravity energy storage stability judgment module, the gravity energy storage power supply stability value is obtained through the current and voltage of the gravity energy storage power supply, and specifically: Step one: set the monitoring period, obtain the current of the gravity energy storage power supply to the battery pack according to the monitoring period, mark it as the reference current, arrange the first ten reference currents up to the current time in order from far to near according to the acquisition time, obtain a plurality of current differences by subtracting the reference current of the next monitoring period from the reference current of the previous monitoring period, sum the nine current differences and take the average to obtain the current difference average, mark the maximum value in the nine current differences as the current difference extreme value, take the current difference average as the minimum value and the current difference extreme value as the maximum value to obtain the current difference fluctuation range, set the current difference fluctuation safety range preset threshold, judge whether the current difference fluctuation range is within the current difference fluctuation safety range preset threshold, if the current difference fluctuation range is within the current difference fluctuation safety range preset threshold, mark the judgment result as the current stability value is 1, if the current difference fluctuation range is not within the current difference fluctuation safety range preset threshold, mark the judgment result as the current stability value is 0; Step two: obtain the voltage of the gravity energy storage power supply to the battery pack according to the monitoring period, mark it as the reference voltage, arrange the first ten reference voltages up to the current time in order from far to near according to the acquisition time, obtain a plurality of voltage differences by subtracting the reference voltage of the next monitoring period from the reference voltage of the previous monitoring period, sum the nine voltage differences and take the average to obtain the voltage difference average, mark the maximum value in the nine voltage differences as the voltage difference extreme value, take the voltage difference average as the minimum value and the voltage difference extreme value as the maximum value to obtain the voltage difference fluctuation range, set the voltage difference fluctuation safety range preset threshold, judge whether the voltage difference fluctuation range is within the voltage difference fluctuation safety range preset threshold, if the voltage difference fluctuation range is within the voltage difference fluctuation safety range preset threshold, mark the judgment result as the voltage stability value is 1, if the voltage difference fluctuation range is not within the voltage difference fluctuation safety range preset threshold, mark the judgment result as the voltage stability value is 0; Step three: obtain the current stability value and the voltage stability value, sum the current stability value and the voltage stability value to obtain the gravity energy storage power supply stability value.

[0010] Preferably, in the gravity energy storage stability judgment module, the gravity energy storage power supply stability value is obtained through the current and voltage of the gravity energy storage power supply, and specifically: Step three: obtain the current gravity energy storage power supply stability value, judge whether the current gravity energy storage power supply stability value is 0, if the current gravity energy storage power supply stability value is 0, execute step four, if the current gravity energy storage power supply stability value is not 0, the judgment result is that it cannot directly supply power to the user; Step four: obtain the previous three gravity energy storage stable values as of the current time, mark them as reference stable values, judge whether the three reference stable values are all 0, if the three reference stable values are all 0, the judgment result is that the user can be directly powered, if the three reference stable values are not all 0, step one is repeated.

[0011] Preferably, in the gravity energy storage stability judgment module, the cooperative power supply mode is switched according to the judgment result, specifically: obtaining the judgment result, if the judgment result is that the user can be directly powered, obtaining the current cooperative power supply mode, if the current cooperative power supply mode is that the battery pack and the photovoltaic electric energy cooperatively supply power to the user, switching the battery pack and the photovoltaic electric energy cooperatively supplying power to the user to the gravity energy storage and the photovoltaic electric energy cooperatively supplying power to the user, if the current cooperative power supply mode is that the gravity energy storage and the photovoltaic electric energy cooperatively supply power to the user, the cooperative power supply mode is not switched. If the judgment result is that the user cannot be directly powered, obtaining the current cooperative power supply mode, if the current cooperative power supply mode is that the battery pack and the photovoltaic electric energy cooperatively supply power to the user, the cooperative power supply mode is not switched, if the current cooperative power supply mode is that the gravity energy storage and the photovoltaic electric energy cooperatively supply power to the user, switching the gravity energy storage and the photovoltaic electric energy cooperatively supplying power to the user to the battery pack and the photovoltaic electric energy cooperatively supplying power to the user.

[0012] (Three) beneficial effects The application provides a photovoltaic power generation and gravity energy storage cooperative system, which has the following beneficial effects: In the scheme, the battery pack is established as an electric quantity buffer storage area, the charge and discharge frequency of the battery pack in the near future and the power consumption condition of each time are judged according to the charge and discharge historical data of the battery pack, so that it is convenient to judge 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, if it is more inclined to be sufficient to meet the user demand, the excess photovoltaic electric quantity is converted to the gravity energy storage for long-term storage, if it is more inclined to be insufficient to meet the user demand, the excess photovoltaic electric quantity is preferentially stored in the battery pack, then the advantage of long-term storage with low loss of the gravity energy storage is utilized, and the loss of electric quantity caused by frequent conversion between the battery pack and the gravity energy storage is avoided, the residual electric quantity of the battery pack is used to ensure that the emergency electric quantity that can supply power to the user is continuously left in the battery pack, so as to avoid the slow conversion efficiency of the gravity energy storage when the photovoltaic electric quantity is insufficient, and to avoid the power failure of the user, and improve the user experience.

[0013] The application monitors the current and voltage of the gravity storage power supply process to the battery pack, so as to determine the stability of the gravity energy storage power conversion, adjust the gravity potential energy discharge mode according to the determination result, and determine whether the discharge state of the gravity storage can directly supply power to the user, thereby avoiding the electric energy to be transferred to the user through the battery pack, reducing the electric energy transfer loss, reducing the working time of the battery pack, prolonging the service life of the battery pack, and intelligently switching between the gravity storage and the battery pack when the photovoltaic electric energy cannot meet the user's power demand, thereby guaranteeing the user's power demand, reducing the electric energy transfer loss, avoiding the risk of line damage caused by the unstable electric energy converted by the gravity storage directly transmitted to the user, reducing the working time of the battery pack, and prolonging the service life of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 A flowchart of a photovoltaic power generation and gravity energy storage collaborative system according to the application; Fig. 2 A module structure diagram of a photovoltaic power generation and gravity energy storage collaborative system according to the application. DETAILED DESCRIPTION

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

[0016] Please refer to Figs. 1-2 The application provides a photovoltaic power generation and gravity energy storage collaborative system, comprising the following modules: A photovoltaic power supply and load determination module acquires a total historical photovoltaic power generation amount, acquires a total historical user load amount, obtains a residual power prediction result from the total historical photovoltaic power generation amount and the total historical user load amount, and determines whether to execute a photovoltaic electric energy excess storage control module or an energy storage collaborative power supply module according to the residual power prediction result; A photovoltaic electric energy excess storage control module establishes a battery pack, acquires battery pack charging and discharging historical data, and selects a photovoltaic excess electric energy storage direction through the battery pack charging and discharging historical data and the residual power of the battery pack; A photovoltaic electric energy and energy storage collaborative power supply module supplies power to the user through the battery pack and the photovoltaic electric energy, and supplies power to the battery pack through the gravity energy storage; The gravity energy storage stability judgment module obtains the current and voltage of the gravity energy storage power supply during the gravity power supply to the battery pack, obtains the gravity energy storage power supply stability value through the current and voltage of the gravity energy storage power supply, judges whether the gravity energy storage can directly supply power to the user through the gravity energy storage power supply stability value, and switches the collaborative power supply mode according to the judgment result.

[0017] In the embodiment, the scheme predicts the power supply situation of photovoltaic power generation through the total historical power of photovoltaic power generation and the total historical power of user load in the photovoltaic power supply and load judgment module, judges whether the power of photovoltaic power generation can meet the power demand of the user through the remaining power prediction result, so as to facilitate subsequent judgment of whether to store the excess power or to supply power to the user in collaboration with the gravity energy storage or the battery pack according to the prediction result of the remaining power; In the embodiment, the scheme establishes the battery pack as a power buffer storage area in the photovoltaic power surplus storage control module, judges the recent charge and discharge frequency and each power consumption situation of the battery pack according to the charge and discharge historical data of the battery pack, so as to facilitate the judgment of whether the recent photovoltaic power tends to be enough to meet the user demand or not enough to meet the user demand. If it tends to be enough to meet the user demand, the excess photovoltaic power is converted to the gravity energy storage for long-term storage. If it tends to be not enough to meet the user demand, the excess photovoltaic power is preferentially stored in the battery pack, and the advantages of long-term storage and low loss of the gravity energy storage are utilized, and the loss of power caused by frequent conversion between the battery pack and the gravity energy storage is avoided. The remaining power of the battery pack facilitates the continuous storage of emergency power in the battery pack that can supply power to the user, thereby avoiding the slow conversion efficiency of the gravity energy storage when the photovoltaic power is insufficient, and avoiding the power failure of the user, and improving the user experience; In the embodiment, the scheme in the photovoltaic power and energy storage collaborative power supply module first supplies power to the user in collaboration with the battery and the photovoltaic power when the photovoltaic power cannot meet the user's use, and supplies power from the gravity energy storage to the battery, thereby avoiding the problem of slow start of the gravity energy storage power supply, and avoiding the phenomenon of line damage caused by direct power supply of the gravity energy storage with unstable power quality to the user, establishing a safety barrier between the power supply station and the user. The charge state of the battery pack can be directly monitored to adjust the discharge mode of the gravity energy storage, and the disadvantage of unstable power supply of the gravity energy storage to the user is avoided; The scheme is beneficial to judging the stability of the gravity energy storage power conversion, adjusting the gravity potential energy discharge mode according to the stability judgment result, and judging whether the discharge state of the gravity energy storage can directly supply power to the user, thereby avoiding that the electric energy can only be transferred to the user through the storage battery pack, reducing the electric energy transfer loss, reducing the working time of the storage battery pack, prolonging the service life of the storage battery pack, intelligently switching between the gravity energy storage and the storage battery pack when the photovoltaic electric energy cannot meet the user's power demand, thereby guaranteeing the user's power demand, reducing the electric energy transfer loss, avoiding the risk of line damage caused by the unstable electric energy converted by the gravity energy storage directly transmitted to the user, reducing the working time of the storage battery pack, and prolonging the service life of the storage battery pack. It is worth mentioning that the preset threshold value in the scheme can be obtained by weight analysis method, which will not be described in detail here.

[0018] In the photovoltaic power supply and load judgment module, the total historical photovoltaic power generation amount is obtained, the total historical user load amount is obtained, the remaining power prediction result is obtained through the total historical photovoltaic power generation amount and the total historical user load amount, and the specific process is as follows: Step one: obtain the total historical photovoltaic power generation amount, set a judgment period, obtain the total historical photovoltaic power generation amount of the previous four judgment periods before the current time as the reference power supply amount, respectively, the reference power supply amount of the next judgment period and the reference power supply amount of the previous judgment period are subtracted to obtain three power supply difference values, the sum of the three power supply difference values is averaged to obtain the average change power supply amount, the total photovoltaic power generation amount at the current time is obtained, and the sum of the total photovoltaic power generation amount at the current time and the average change power supply amount is obtained to obtain the predicted power supply amount; Step two: obtain the total historical user load amount, obtain the total historical user load amount of the previous four judgment periods before the current time according to the judgment period, mark as the reference power consumption amount, respectively, the reference power consumption amount of the next judgment period and the reference power consumption amount of the previous judgment period are subtracted to obtain three power consumption difference values, the sum of the three power consumption difference values is averaged to obtain the average change power consumption amount, the total user load amount at the current time is obtained, and the sum of the total user load amount at the current time and the average change power consumption amount is obtained to obtain the predicted power consumption amount; Step three: the total power difference is obtained by subtracting the predicted power supply amount from the predicted power consumption amount, a total power difference preset threshold value is set, whether the total power difference is greater than the total power difference preset threshold value is judged, if the total power difference is greater than the total power difference preset threshold value, the remaining power prediction result is marked as 1, if the total power difference is less than or equal to the total power difference preset threshold value, the remaining power prediction result is marked as 0. In the photovoltaic power supply and load judgment module, according to the remaining power prediction result, whether to execute the photovoltaic power surplus storage control module or the energy storage collaborative power supply module is judged, specifically: the remaining power prediction result is obtained, if the remaining power prediction result is 1, the photovoltaic power surplus 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.

[0019] In this embodiment, the power supply situation of photovoltaic power generation is predicted through the total historical power of photovoltaic power generation and the total historical power of user load, and whether the power of photovoltaic power generation can meet the power demand of the user is judged through the remaining power prediction result, so as to facilitate subsequent judgment of whether to store the surplus power or to supply power to the user by collaborative gravity energy storage or battery pack according to the prediction result of the remaining power. By setting the total power threshold value as a positive number, the remaining power prediction result can be more conservative, and thus when the predicted power supply is slightly higher than the predicted power consumption, collaborative power supply is still adopted, thereby avoiding the phenomenon of user power failure caused by inaccurate prediction results.

[0020] In the photovoltaic power surplus storage control module, the direction of photovoltaic surplus power storage is selected through the battery pack charging and discharging historical data and the remaining power of the battery pack, specifically: Step one: obtain the battery pack charging and discharging historical data, obtain the total time length of the battery assisting photovoltaic power generation to supply power to the user within seven days as of today through the battery pack charging and discharging historical data, marked as total assistance time length, obtain the total number of times of the battery assisting photovoltaic power generation to supply power to the user within seven days as of today through the battery pack charging and discharging historical data, marked as total assistance times, and obtain the assistance average time length by taking the quotient of the total assistance time length and the total assistance times; Step two: set the assistance average time length preset threshold, judge whether the assistance average time length is greater than the assistance average time length preset threshold, if the assistance average time length is greater than or equal to the assistance average time length preset threshold, execute step three, if the assistance average time length is less than the assistance average time length preset threshold, input the photovoltaic surplus power into the gravity energy storage for storage; Step three: obtain the remaining power of the battery pack, judge whether the remaining power of the battery pack is less than forty percent, if the remaining power of the battery pack is less than or equal to forty percent, input the photovoltaic surplus power into the battery pack for storage, if the remaining power of the battery pack is greater than ninety percent, input the photovoltaic surplus power into the gravity energy storage for storage.

[0021] In this embodiment, by establishing a battery pack as an electric quantity buffer storage area, the recent charging and discharging frequency of the battery and the power consumption of each time are judged according to the charging and discharging history data of the battery pack, so as to facilitate judging whether the recent photovoltaic electric quantity is more inclined to be sufficient to meet the user demand or not sufficient to meet the user demand. If it is more inclined to be sufficient to meet the user demand, the photovoltaic excess electric energy is converted to the gravitational energy storage for long-term storage. If it is more inclined to be insufficient to meet the user demand, the photovoltaic excess electric energy is preferentially stored in the battery pack, and then the advantage of low loss of long-term storage is facilitated by using the gravitational energy storage. Also, the loss of electric energy caused by frequent conversion between the battery pack and the gravitational energy storage is avoided. The residual electric quantity of the battery pack is used to ensure that there is emergency electric quantity in the battery pack that can supply power to the user, thereby avoiding the situation that the gravitational energy storage conversion efficiency is slow when the photovoltaic electric energy is insufficient, and avoiding the user power failure, and improving the user experience.

[0022] In the photovoltaic electric energy and energy storage collaborative power supply module, the user is supplied with power by the battery pack and photovoltaic electric energy, and the battery pack is supplied with power by the gravitational energy storage. Specifically, Step four: obtaining the predicted power supply quantity and the predicted power consumption quantity, and obtaining the required electric quantity difference by taking the absolute value of the difference between the predicted power consumption quantity and the predicted power supply quantity; Step five: obtaining the residual electric quantity of the battery pack, setting an electric quantity fault preset threshold, and obtaining the safe electric quantity of the battery pack by summing the residual electric quantity of the battery pack and the electric quantity fault preset threshold; Step six: judging whether the safe electric quantity of the battery pack is greater than the required electric quantity difference. If the safe electric quantity of the battery pack is greater than the required electric quantity difference, the battery pack cooperates with the photovoltaic electric energy to supply power to the user. If the safe electric quantity of the battery pack is less than or equal to the required electric quantity difference, the battery pack cooperates with the photovoltaic electric energy to supply power to the user while the gravitational energy storage supplies power to the battery pack.

[0023] In this embodiment, when the photovoltaic electric energy cannot meet the user's use, the battery and the photovoltaic electric energy are used to supply power to the user, and the gravitational energy storage supplies power to the battery, thereby avoiding the problem that the gravitational energy storage power supply starts slowly. It is also convenient to avoid the phenomenon that the unstable quality of the gravitational energy storage directly supplies power to the user, causing line damage. A safety barrier is established between the power supply station and the user. The charging state of the battery pack can be directly monitored to adjust the discharge mode of the gravitational energy storage, and the disadvantage of unstable power supply of the gravitational energy storage to the user is avoided.

[0024] In the gravitational energy storage stability judgment module, the gravitational energy storage power supply stability value is obtained by the current and voltage of the gravitational energy storage power supply. Specifically, Step one: set the monitoring period, get the current of the gravity energy storage to the storage battery pack, mark it as the reference current, arrange the previous ten reference currents according to the acquisition time from far to near, get the current difference by subtracting the reference current of the previous monitoring period from the reference current of the next monitoring period, sum the nine current differences and take the average to get the current difference average, mark the maximum value of the nine current differences as the current difference extreme value, get the current difference fluctuation range with the current difference average as the minimum value and the current difference extreme value as the maximum value, set the current difference fluctuation safety range preset threshold, judge whether the current difference fluctuation range is within the current difference fluctuation safety range preset threshold, if the current difference fluctuation range is within the current difference fluctuation safety range preset threshold, mark the judgment result as the current stable value is 1, if the current difference fluctuation range is not within the current difference fluctuation safety range preset threshold, mark the judgment result as the current stable value is 0; Step two: get the voltage of the gravity energy storage to the storage battery pack according to the monitoring period, mark it as the reference voltage, arrange the previous ten reference voltages according to the acquisition time from far to near, get the voltage difference by subtracting the reference voltage of the previous monitoring period from the reference voltage of the next monitoring period, sum the nine voltage differences and take the average to get the voltage difference average, mark the maximum value of the nine voltage differences as the voltage difference extreme value, get the voltage difference fluctuation range with the voltage difference average as the minimum value and the voltage difference extreme value as the maximum value, set the voltage difference fluctuation safety range preset threshold, judge whether the voltage difference fluctuation range is within the voltage difference fluctuation safety range preset threshold, if the voltage difference fluctuation range is within the voltage difference fluctuation safety range preset threshold, mark the judgment result as the voltage stable value is 1, if the voltage difference fluctuation range is not within the voltage difference fluctuation safety range preset threshold, mark the judgment result as the voltage stable value is 0; Step three: get the current stable value and the voltage stable value, sum the current stable value and the voltage stable value to get the gravity energy storage power supply stability value.

[0025] In this embodiment, by monitoring the state of current and voltage during the process of gravity supplying power to the storage battery pack, the stability of gravity energy storage power conversion can be judged, so that the gravity potential energy discharge mode can be adjusted according to the judgment result of stability, and whether the discharge state of gravity energy storage can directly supply power to the user can also be judged, thereby avoiding that the electric energy can only be transferred to the user through the storage battery pack, avoiding the electric energy transfer loss, reducing the working time of the storage battery pack, and prolonging the service life of the storage battery pack.

[0026] In the gravity energy storage stability judgment module, whether the gravity energy storage can directly supply power to the user is judged by the gravity energy storage power supply stability value, specifically: Step three: obtain the current gravity energy storage power supply stability value, judge whether the current gravity energy storage power supply stability value is 0, if the current gravity energy storage power supply stability value is 0, execute step four, if the current gravity energy storage power supply stability value is not 0, the judgment result is that the user cannot be directly powered; Step four: obtain the previous three gravity energy storage power supply stability values up to the current time, marked as reference stability values, judge whether the three reference stability values are all 0, if the three reference stability values are all 0, the judgment result is that the user can be directly powered, if the three reference stability values are not all 0, repeat step one; In the gravity energy storage stability judgment module, according to the judgment result, the collaborative power supply mode is switched, specifically: obtain the judgment result, if the judgment result is that the user can be directly powered, obtain the current collaborative power supply mode, if the current collaborative power supply mode is that the battery group and the photovoltaic electric energy are collaboratively powered for the user, switch the battery group and the photovoltaic electric energy collaboratively powered for the user to the gravity energy storage and the photovoltaic electric energy collaboratively powered for the user, if the current collaborative power supply mode is that the gravity energy storage and the photovoltaic electric energy are collaboratively powered for the user, do not switch the collaborative power supply mode; If the judgment result is that the user cannot be directly powered, obtain the current collaborative power supply mode, if the current collaborative power supply mode is that the battery group and the photovoltaic electric energy are collaboratively powered for the user, do not switch the collaborative power supply mode, if the current collaborative power supply mode is that the gravity energy storage and the photovoltaic electric energy are collaboratively powered for the user, switch the gravity energy storage and the photovoltaic electric energy collaboratively powered for the user to the battery group and the photovoltaic electric energy collaboratively powered for the user.

[0027] In the embodiment, when the photovoltaic electric energy cannot meet the user's electricity demand, intelligent switching is performed between the gravity energy storage and the battery group in collaborative power supply to the user according to the judgment result of the power supply stability value, so as to facilitate guaranteeing the user's electricity demand while reducing the loss of electric energy transfer, avoiding the risk that the large fluctuation and instability of the converted electric energy of the gravity energy storage directly transmitted to the user easily causes line damage, and reducing the working time of the battery group, thereby prolonging the service life of the battery group.

[0028] The above embodiments can be realized wholly or partially by software, hardware, firmware or any combination thereof. When realized by software, the above embodiments can be realized in the form of a computer program product wholly or partially. Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized by hardware or software depends on the specific application and design constraints of the technical solutions.

[0029] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may also be distributed to multiple network units. Part or all of the units can be selected to achieve the purpose of the embodiment of the present application according to actual needs.

[0030] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present 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 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.

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 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 by gravity energy storage to the battery pack 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. Use the mean current difference as the minimum value and the current difference extreme value as the maximum value to obtain the current difference fluctuation range. 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. Use the average voltage difference as the minimum value and the voltage difference extreme value as the maximum value to obtain the voltage difference fluctuation range. 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.

7. A photovoltaic power generation and gravity energy storage synergistic system according to claim 6, 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.

8. The photovoltaic power generation and gravity energy storage synergistic system according to claim 7, 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, then 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, then 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, then the collaborative power supply mode of gravity energy storage and photovoltaic power supply to the user is switched to that of the battery pack and photovoltaic power supply.

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