CN116054349A - Photovoltaic energy storage battery pack voltage control protection system - Google Patents
Photovoltaic energy storage battery pack voltage control protection system Download PDFInfo
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- CN116054349A CN116054349A CN202310173073.XA CN202310173073A CN116054349A CN 116054349 A CN116054349 A CN 116054349A CN 202310173073 A CN202310173073 A CN 202310173073A CN 116054349 A CN116054349 A CN 116054349A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00308—Overvoltage protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention belongs to the technical field of voltage control of energy storage battery packs, and particularly relates to a voltage control protection system of a photovoltaic energy storage battery pack. The invention can acquire the voltage state of each battery cell in real time in the working process of the energy storage battery pack, can realize the distribution of the voltage, ensures that the running loss of each battery cell is relatively consistent, and can calibrate in advance in the voltage balancing process, so that the balancing process can realize the balancing of each battery cell in the energy storage battery pack under the condition that the normal working of an electric device is not influenced, and the phenomenon that the overvoltage or the excessive loss of the energy storage battery pack occurs due to the large load of each battery cell can be avoided based on the process, so that the energy storage battery pack can stably provide electric power support for the electric device for a long time.
Description
Technical Field
The invention belongs to the technical field of voltage control of energy storage battery packs, and particularly relates to a voltage control protection system of a photovoltaic energy storage battery pack.
Background
The photovoltaic energy storage battery pack is an electric chemical device which is used for converting the light energy into chemical energy for storage and releasing the electric energy when the photovoltaic energy storage battery pack is needed to be used, and particularly, the photovoltaic energy storage battery pack is composed of a plurality of battery monomers which are connected in series and in parallel, in actual operation, the series and parallel connection modes of each battery monomer are required to be determined according to the requirements of electric devices, and further, the operation loss of each battery monomer is inconsistent, and accordingly, the phenomenon that part of battery monomers are lower than protection voltage and cannot provide electric power support for the electric devices can occur, and the battery higher than the protection voltage is excessively worn after continuous long-time operation, and further, a corresponding battery pack voltage control protection system is required to be formulated for carrying out voltage distribution and balanced management on the battery monomers in the energy storage battery pack, so that the phenomenon of overvoltage or excessive loss of the energy storage battery pack is avoided.
The voltage control protection system that current photovoltaic energy storage group battery was equipped with adopts the measure of overdischarge protection to realize the control protection of voltage more, promptly when the battery monomer excessive pressure, shift its voltage to a divider resistor, prevent that the phenomenon of battery monomer excessive pressure from taking place, but this mode can produce unnecessary loss to the electric energy for the corresponding reduction of energy storage group battery's life cycle, and at discharging process, the produced operation load of battery monomer is great, reduces its life easily, based on this, this scheme provides a control protection system that can each battery monomer voltage of real-time equilibrium.
Disclosure of Invention
The invention aims to provide a voltage control protection system of a photovoltaic energy storage battery pack, which can acquire the voltage state of each battery cell in real time in the working process of the energy storage battery pack, and can also realize voltage distribution, so that the running loss of each battery cell is relatively consistent, and the phenomenon that the energy storage battery pack is over-pressed or excessively lost due to the fact that the load of each battery cell is large is avoided.
The technical scheme adopted by the invention is as follows:
the voltage control protection system of the photovoltaic energy storage battery pack comprises a detection module, an equalization module, a calibration module, a judgment module and a main control module;
the detection module is used for collecting the output voltage of each battery cell in the energy storage battery pack in real time;
the equalization module is used for acquiring protection voltage and comparing the protection voltage with the output voltage of each battery cell to judge whether the battery cell lower than the protection voltage exists in the energy storage battery pack;
if the battery cell exists, charging electric quantity to the battery cell lower than the protection voltage by the battery cell higher than the protection voltage;
if not, all the battery monomers keep the current state to continue working;
the calibration module is used for acquiring real-time voltages of all the battery cells higher than the protection voltage and the battery cells lower than the protection voltage, and inputting the real-time voltages into the calibration model to obtain the battery cells higher than the protection voltage and the battery cells lower than the protection voltage which are mutually corresponding;
the judging module is used for obtaining the output voltage required by the energy storage battery pack, calibrating the output voltage as the required voltage, synchronously obtaining the sum of the voltages of all the battery cells in the serial state, calibrating the sum as the supply voltage, and comparing the required voltage with the supply voltage;
if the required voltage is greater than or equal to the supply voltage, judging that the energy storage battery pack is insufficient in voltage supply, and generating an alarm signal;
if the required voltage is smaller than the supply voltage, judging that the energy storage battery pack normally operates;
the main control module is used for receiving and transmitting and processing operation signals among the detection module, the equalization module, the calibration module and the judgment module.
In a preferred scheme, on-off switches are arranged at two ends of each battery monomer, and the on-off switches are controlled by a main control unit.
In a preferred scheme, when the detection module collects the output voltage of each battery cell, a detection result is sent to the main control module at a cut-off point of a detection period at regular intervals;
the detection period comprises a collection nodes, wherein a=1, 2,3 … … n, n is a natural number greater than zero;
acquiring the output voltage of each battery cell under each acquisition node in real time, and calculating the voltage loss trend value of each battery cell in the detection period;
and inputting the voltage loss trend value and the protection voltage of each battery cell into a prediction model, and outputting the prediction value.
In a preferred scheme, the specific process of inputting the voltage loss trend value and the protection voltage of each battery cell into the prediction model and outputting the predicted value is as follows:
acquiring the output voltage of the energy storage battery pack in the detection period, and judging whether the output voltage changes or not;
if yes, calibrating the acquisition node and the fluctuation interval of the output voltage fluctuation of the energy storage battery pack, inputting the acquisition node and the fluctuation interval into a calibration model, and judging whether the acquisition node and the fluctuation interval accord with the standard input into a prediction model;
if not, directly inputting the voltage loss trend value of each battery cell and the protection voltage into a prediction model together to obtain a predicted value of the output voltage of the next detection period.
In a preferred scheme, in the detection period, when the output voltage of the energy storage battery pack fluctuates, a fluctuation interval between adjacent acquisition nodes is acquired and compared with a standard prediction period;
if a fluctuation interval exceeding a standard prediction period exists in the detection period, the voltage loss trend value of each battery cell in the fluctuation interval and the protection voltage are input into a prediction model together;
if the fluctuation interval exceeding the standard prediction period does not exist in the detection period, the voltage loss trend value of each battery monomer in the detection period is not satisfied with the standard input to the prediction model;
the standard prediction period is a preset value, and the value range of the standard prediction period is smaller than the detection period.
In a preferred scheme, when the battery cells lower than the protection voltage exist in the energy storage battery pack, the occupation ratio of all the battery cells lower than the protection voltage is counted, and whether the battery cells higher than the protection voltage can charge electricity to the battery cells lower than the protection voltage is determined, wherein the specific process is as follows:
acquiring the total number of battery monomers in the energy storage battery pack;
acquiring the number of the battery cells lower than the protection voltage, and calculating the occupation ratio of the battery cells lower than the protection voltage;
obtaining a standard occupation ratio and comparing the standard occupation ratio with the occupation ratio of the battery cells lower than the protection voltage;
if the standard occupation ratio is larger than or equal to the occupation ratio of the battery cells with lower protection voltage, judging that the battery cells with higher protection voltage charge electric quantity to the battery cells with lower protection voltage;
and if the standard occupation ratio is smaller than the occupation ratio of the battery cells lower than the protection voltage, the battery cells higher than the protection voltage are charged with electric quantity.
In a preferred scheme, the balancing module comprises a rechecking unit, a balancing unit and a balancing unit, wherein the rechecking unit is used for acquiring the part of each battery cell higher than the protection voltage exceeding the protection voltage and calibrating the part as the distribution quantity before the battery cell higher than the protection voltage charges the battery cell lower than the protection voltage;
estimating the loss of the battery monomer higher than the protection voltage in the next detection period according to the predicted value;
and inputting the loss and the distribution into a judging function, and judging whether the battery cell higher than the protection voltage can charge the battery cell lower than the protection voltage.
In a preferred scheme, the equalization module comprises a voltage dividing unit, and the voltage dividing unit comprises a voltage dividing resistor and is used for dividing the output voltage higher than the energy storage battery pack.
In a preferred embodiment, after each detection cycle has ended, all cells above the protection voltage and cells below the protection voltage are counted and input into a calibration model, wherein:
the calibration model is used for sequencing all the battery cells which meet the judging function and are higher than the protection voltage and the battery cells which are lower than the protection voltage, wherein the battery cells which are higher than the protection voltage are arranged in the sequence from high to low, and the battery cells which are lower than the protection voltage are arranged in the sequence from low to high.
The utility model provides a photovoltaic energy storage group battery voltage control protection terminal, is applied to foretell photovoltaic energy storage group battery voltage control protection system, includes:
at least one processor;
and a memory communicatively coupled to the at least one processor;
wherein the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor.
The invention has the technical effects that:
the invention can acquire the voltage state of each battery cell in real time in the working process of the energy storage battery pack, can realize the distribution of the voltage, ensures that the running loss of each battery cell is relatively consistent, and can calibrate in advance in the voltage balancing process, so that the balancing process can realize the balancing of each battery cell in the energy storage battery pack under the condition that the normal working of an electric device is not influenced, and the phenomenon that the overvoltage of the energy storage battery pack or the excessive loss of the energy storage battery pack is caused by the larger load of each battery cell can be avoided based on the process, so that the energy storage battery pack can stably provide electric power support for the electric device for a long time.
Drawings
FIG. 1 is a system operational diagram provided by an embodiment of the present invention;
fig. 2 is a system block diagram provided by an embodiment of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one preferred embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Referring to fig. 1 and 2, the invention provides a voltage control protection system of a photovoltaic energy storage battery pack, which comprises a detection module, an equalization module, a calibration module, a judgment module and a main control module;
the detection module is used for collecting the output voltage of each battery monomer in the energy storage battery pack in real time, on-off switches are arranged at two ends of each battery monomer, and the on-off switches are controlled by the main control unit;
the equalization module is used for acquiring the protection voltage, comparing the protection voltage with the output voltage of each battery cell, and judging whether the battery cells lower than the protection voltage exist in the energy storage battery pack;
if the battery cell exists, charging electric quantity to the battery cell lower than the protection voltage by the battery cell higher than the protection voltage;
if not, all the battery monomers keep the current state to continue working;
the calibration module is used for acquiring real-time voltages of all the battery cells higher than the protection voltage and the battery cells lower than the protection voltage, and inputting the real-time voltages into the calibration model to obtain the battery cells higher than the protection voltage and the battery cells lower than the protection voltage which are mutually corresponding;
the judging module is used for obtaining the output voltage required by the energy storage battery pack, calibrating the output voltage as the required voltage, synchronously obtaining the sum of the voltages of all the battery cells in the serial state, calibrating the sum as the supply voltage, and comparing the required voltage with the supply voltage;
if the required voltage is greater than or equal to the supply voltage, judging that the energy storage battery pack is insufficient in voltage supply, and generating an alarm signal;
if the required voltage is smaller than the supply voltage, judging that the energy storage battery pack normally operates;
the main control module is used for receiving and processing the operation signals among the detection module, the equalization module, the calibration module and the judgment module.
The photovoltaic energy storage battery pack is an electric chemical device which is used for converting the light energy into chemical energy to store the chemical energy and releasing the electric energy when the electric energy is needed to be used, and the electric chemical device is particularly composed of a plurality of battery monomers which are connected in series and in parallel so as to be convenient to adjust according to different output voltages, and further in the process, the loss of each battery monomer is inconsistent, excessive loss of part of the battery monomers can occur, or the phenomenon of excessive pressure of part of the battery monomers can occur, which can definitely cause the energy storage battery pack to have larger risk in the follow-up operation, based on the fact, the output voltages of each battery monomer are respectively monitored, the output voltages of each battery monomer are obtained in real time, and on the basis, a protection voltage is preset, the protection voltage is set on the premise that the battery monomers are not excessively lost, and particularly according to the specification of each battery monomer, when the battery monomer lower than the protection voltage appears in the energy storage battery pack, the battery monomer higher than the protection voltage charges the battery monomer lower than the protection voltage, but before that, the occupation ratio of the battery monomer lower than the protection voltage needs to be judged, and whether the battery monomer higher than the protection voltage charges the battery monomer lower than the protection voltage or not is determined according to the occupation ratio, so that the phenomenon of insufficient voltage supply of the energy storage battery pack is avoided, and when the battery monomer higher than the protection voltage charges the battery monomer lower than the protection voltage, the two battery monomers are matched one by utilizing a calibration model, so that the capacity and the voltage of each battery monomer can be balanced, and the energy storage battery pack is equipment for providing power for external electric devices, so that the output voltage of the energy storage battery pack needs to be determined according to the required voltage of the external electric devices, and when the voltage values of all the battery monomers higher than the protection voltage are obtained, judging whether the voltage values which are connected in series are larger than the required voltage, if so, indicating that the energy storage battery pack can provide corresponding voltage support for the electric devices, otherwise, generating corresponding alarm signals, stopping conveying electric quantity to the external electric devices, and avoiding the phenomenon of excessive loss of the energy storage battery pack.
In a preferred embodiment, when the detection module collects the output voltage of each battery cell, the detection module periodically sends a detection result to the main control module at a cut-off point of a detection period;
the detection period comprises a collection nodes, wherein a=1, 2,3 … … n, n is a natural number greater than zero;
acquiring the output voltage of each battery cell under each acquisition node in real time, and calculating the voltage loss trend value of each battery cell in the detection period;
and inputting the voltage loss trend value and the protection voltage of each battery cell into a prediction model, and outputting the prediction value.
In the above, when the electric device is operated, the electric device generally continuously works for a period of time according to the set power, through the establishment of the detection period, the output voltage of each battery cell under the cut-off point and the output voltage of each battery cell under each acquisition node in the detection period can be periodically obtained, so that the voltage loss trend value of each battery cell can be predicted, wherein the calculation formula of the voltage loss trend value is as follows:
wherein->
Represents a voltage loss trend value, < >>
Output voltage of battery cell representing last-bit collection node, +.>
The output voltage of each battery cell of the initial acquisition node is represented, based on the output voltage, the output voltage of each battery cell in the next detection period can be judged according to the prediction model, and corresponding quota data support is provided for equalizing the voltage of the equalization module.
In a preferred embodiment, the specific process of inputting the voltage loss trend value and the protection voltage of each battery cell into the prediction model and outputting the predicted value is as follows:
acquiring the output voltage of the energy storage battery pack in the detection period, and judging whether the output voltage changes or not;
if yes, calibrating the acquisition node and the fluctuation interval of the output voltage fluctuation of the energy storage battery pack, inputting the acquisition node and the fluctuation interval into a calibration model, and judging whether the acquisition node and the fluctuation interval accord with the standard input into a prediction model;
if not, directly inputting the voltage loss trend value of each battery cell and the protection voltage into a prediction model together to obtain a predicted value of the output voltage of the next detection period.
As described above, in the detection period, the voltage required by the electric device may need to be adjusted, and thus the output voltage of the energy storage battery pack may also be adjusted accordingly, and accordingly, the adjusted voltage of the battery cell may also be changed accordingly, and at this time, it is obviously undesirable to determine the predicted value of the battery cell based on the adjusted voltage, so that when determining the predicted value of the output voltage of the battery cell, it is necessary to determine in advance whether the output voltage of the energy storage battery pack is changed in the detection period.
In a preferred embodiment, in the detection period, when the output voltage of the energy storage battery pack fluctuates, the fluctuation interval between the adjacent acquisition nodes is acquired and compared with the standard prediction period;
if a fluctuation interval exceeding a standard prediction period exists in the detection period, the voltage loss trend value of each battery cell in the fluctuation interval and the protection voltage are input into the prediction model together;
if the variation interval exceeding the standard prediction period does not exist in the detection period, the voltage loss trend value of each battery cell in the detection period is indicated to not meet the standard input to the prediction model;
the standard prediction period is a preset value, and the value range is smaller than the detection period.
In this embodiment, in the case where there is a variation in the output voltage of the energy storage battery pack during the detection period, it is necessary to determine the variation interval between adjacent collection nodes in the detection period, and to ensure the accuracy of calculation of the predicted value of the battery cell, the variation interval is compared with a standard prediction period, wherein the standard prediction period is preferably two thirds of the detection period, and for the variation interval satisfying the conditionThe voltage loss trend value of the cell in the compartment can be input into a prediction model, wherein the standard function in the prediction model is as follows:
wherein->
Representing predicted values +.>
And if the predicted value is larger than zero, the battery cell can still support the operation of the next detection period, and the operation duration of each battery cell in the state can be deduced based on the same formula.
In a preferred embodiment, when the battery cells below the protection voltage exist in the energy storage battery pack, the occupation ratio of all the battery cells below the protection voltage is counted, and whether the battery cells above the protection voltage can charge the battery cells below the protection voltage is determined, which comprises the following specific processes:
acquiring the total number of battery monomers in the energy storage battery pack;
acquiring the number of the battery cells lower than the protection voltage, and calculating the occupation ratio of the battery cells lower than the protection voltage;
obtaining a standard occupation ratio and comparing the standard occupation ratio with the occupation ratio of the battery cells lower than the protection voltage;
if the standard occupation ratio is larger than or equal to the occupation ratio of the battery cells lower than the protection voltage, judging that the battery cells higher than the protection voltage charge electric quantity to the battery cells lower than the protection voltage;
if the standard occupation ratio is smaller than the occupation ratio of the battery cells lower than the protection voltage, the battery cells higher than the protection voltage are charged with electricity.
In the above, when the battery cell below the protection voltage exists in the energy storage battery pack, the occupation ratio of the battery cell below the protection voltage needs to be calculated and compared with the standard occupation ratio, so that whether the battery cell above the protection voltage charges the battery cell below the protection voltage or not can be determined, under the condition that an external electric device works normally and the battery cell above the protection voltage can provide stable voltage support, the battery cell above the protection voltage does not provide electric power support for the battery cell below the protection voltage, and under the condition that the electric device stops working and charges the energy storage battery pack, or the battery cell above the protection voltage cannot provide stable voltage support for the electric device, the battery cell above the protection voltage charges the battery cell below the protection voltage, the battery cell with the largest residual electric quantity corresponds to the battery cell with the lowest residual electric quantity, and the like, and the purpose of balancing the voltages of the battery cells can be achieved.
In a preferred embodiment, the equalization module includes a rechecking unit, configured to obtain a portion of each of the battery cells above the protection voltage exceeding the protection voltage and calibrated as a dispensing amount before the battery cells above the protection voltage charge the battery cells below the protection voltage;
estimating the loss of the battery monomer higher than the protection voltage in the next detection period according to the predicted value;
and inputting the loss and the distribution into a judging function, and judging whether the battery cell higher than the protection voltage can charge the battery cell lower than the protection voltage.
In this embodiment, the rechecking module can recheck the battery cell higher than the protection voltage before charging the battery cell lower than the protection voltage, so as to avoid the process from affecting the normal power supply of the energy storage battery pack to the electric device, specifically, the prediction needs to be performed according to the obtained prediction value, the distribution amount (the part exceeding the protection voltage) of the battery cell higher than the protection voltage is first determined by accumulating pressure, then the loss amount generated in a single detection period of the battery cell higher than the protection voltage is calculated, and the loss amount is input to the determination function to determine, wherein the determination function is:
wherein->
The amount of the dispensing is indicated and,
the loss is represented, and only on the basis of meeting the formula, the battery cell higher than the protection voltage can charge the battery cell lower than the protection voltage, otherwise, even if the battery cell lower than the protection voltage is charged, the battery cell still can not provide voltage support for the electric device, and even the energy storage battery pack can still stop working prematurely.
In a preferred embodiment, the equalization module comprises a voltage dividing unit, the voltage dividing unit comprises a voltage dividing resistor and is used for dividing the output voltage higher than the energy storage battery pack, the voltage dividing unit is a passive voltage dividing process, the phenomenon that partial battery cells are over-voltage is avoided in the charging process, and the operation safety of the energy storage battery pack is ensured.
In a preferred embodiment, after each detection period is completed, all the cells above the protection voltage and the cells below the protection voltage are counted and input into the calibration model, wherein:
the calibration model is used for sequencing all the battery cells which meet the judging function and are higher than the protection voltage and the battery cells which are lower than the protection voltage, wherein the battery cells which are higher than the protection voltage are arranged in the sequence from high to low, and the battery cells which are lower than the protection voltage are arranged in the sequence from low to high.
According to the calibration model, the battery monomer higher than the protection voltage and the battery monomer lower than the protection voltage can be subjected to induction processing, when the battery monomer higher than the protection voltage is determined to charge the battery monomer lower than the protection voltage, the corresponding result can be quickly matched according to the sequencing result, so that the battery monomer higher than the protection voltage can obtain partial pressure, the battery monomer lower than the protection voltage can also be supplemented with electric quantity, and the battery monomer is put into operation again, so that the phenomenon of excessive loss caused by high-strength operation of part of battery monomers can be reduced, and the probability of damage of the energy storage battery pack in the operation process is correspondingly reduced.
The utility model provides a photovoltaic energy storage group battery voltage control protection terminal, is applied to foretell photovoltaic energy storage group battery voltage control protection system, includes:
at least one processor;
and a memory communicatively coupled to the at least one processor;
wherein the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor.
Those skilled in the art will appreciate that the voltage control protection terminal of the present invention may be specially designed and manufactured for the required purpose, or may comprise a known device in a general purpose computer. These devices have computer programs or applications stored therein that are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., a computer) readable medium or any type of medium suitable for storing electronic instructions and respectively coupled to a bus, including, but not limited to, any type of disk (including floppy disks, hard disks, optical disks, CD-ROMs, and magneto-optical disks), ROMs (Read-Only memories), RAMs (Random AccessMemory, random access memories), EPROMs (Erasable Programmable Read-Only memories), EEPROMs (Electrically Erasable Programmable Read-Only memories), flash memories, magnetic cards, or optical cards. That is, a readable medium includes any medium that stores or transmits information in a form readable by a device (e.g., a computer).
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, apparatus, article, or method. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, apparatus, article or method that comprises the element.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention. Structures, devices and methods of operation not specifically described and illustrated herein, unless otherwise indicated and limited, are implemented according to conventional means in the art.
Claims (10)
1. The utility model provides a photovoltaic energy storage group battery voltage control protection system, includes detection module, balanced module, calibration module, decision module and main control module, its characterized in that:
the detection module is used for collecting the output voltage of each battery cell in the energy storage battery pack in real time;
the equalization module is used for acquiring protection voltage and comparing the protection voltage with the output voltage of each battery cell to judge whether the battery cell lower than the protection voltage exists in the energy storage battery pack;
if the battery cell exists, charging electric quantity to the battery cell lower than the protection voltage by the battery cell higher than the protection voltage;
if not, all the battery monomers keep the current state to continue working;
the calibration module is used for acquiring real-time voltages of all the battery cells higher than the protection voltage and the battery cells lower than the protection voltage, and inputting the real-time voltages into the calibration model to obtain the battery cells higher than the protection voltage and the battery cells lower than the protection voltage which are mutually corresponding;
the judging module is used for obtaining the output voltage required by the energy storage battery pack, calibrating the output voltage as the required voltage, synchronously obtaining the sum of the voltages of all the battery cells in the serial state, calibrating the sum as the supply voltage, and comparing the required voltage with the supply voltage;
if the required voltage is greater than or equal to the supply voltage, judging that the energy storage battery pack is insufficient in voltage supply, and generating an alarm signal;
if the required voltage is smaller than the supply voltage, judging that the energy storage battery pack normally operates;
the main control module is used for receiving and transmitting and processing operation signals among the detection module, the equalization module, the calibration module and the judgment module.
2. The photovoltaic energy storage battery voltage control protection system of claim 1 wherein: the two ends of each battery monomer are provided with on-off switches, and the on-off switches are controlled by the main control unit.
3. The photovoltaic energy storage battery voltage control protection system of claim 1 wherein: the detection module periodically sends detection results to the main control module at a cut-off point of a detection period when the detection module collects the output voltage of each battery cell;
the detection period comprises a collection nodes, wherein a=1, 2,3 … … n, n is a natural number greater than zero;
acquiring the output voltage of each battery cell under each acquisition node in real time, and calculating the voltage loss trend value of each battery cell in the detection period;
and inputting the voltage loss trend value and the protection voltage of each battery cell into a prediction model, and outputting the prediction value.
4. The photovoltaic energy storage battery voltage control protection system of claim 1 wherein: the specific process of inputting the voltage loss trend value and the protection voltage of each battery cell into the prediction model and outputting the prediction value is as follows:
acquiring the output voltage of the energy storage battery pack in the detection period, and judging whether the output voltage changes or not;
if yes, calibrating the acquisition node and the fluctuation interval of the output voltage fluctuation of the energy storage battery pack, inputting the acquisition node and the fluctuation interval into a calibration model, and judging whether the acquisition node and the fluctuation interval accord with the standard input into a prediction model;
if not, directly inputting the voltage loss trend value of each battery cell and the protection voltage into a prediction model together to obtain a predicted value of the output voltage of the next detection period.
5. The photovoltaic energy storage battery voltage control protection system of claim 1 wherein: in the detection period, when the output voltage of the energy storage battery pack fluctuates, the fluctuation interval between adjacent acquisition nodes is acquired and compared with a standard prediction period;
if a fluctuation interval exceeding a standard prediction period exists in the detection period, the voltage loss trend value of each battery cell in the fluctuation interval and the protection voltage are input into a prediction model together;
if the fluctuation interval exceeding the standard prediction period does not exist in the detection period, the voltage loss trend value of each battery monomer in the detection period is not satisfied with the standard input to the prediction model;
the standard prediction period is a preset value, and the value range of the standard prediction period is smaller than the detection period.
6. The photovoltaic energy storage battery voltage control protection system of claim 1 wherein: when the battery cells lower than the protection voltage exist in the energy storage battery pack, the occupation ratio of all the battery cells lower than the protection voltage is counted, and whether the battery cells higher than the protection voltage can charge electric quantity to the battery cells lower than the protection voltage or not is determined, wherein the specific process is as follows:
acquiring the total number of battery monomers in the energy storage battery pack;
acquiring the number of the battery cells lower than the protection voltage, and calculating the occupation ratio of the battery cells lower than the protection voltage;
obtaining a standard occupation ratio and comparing the standard occupation ratio with the occupation ratio of the battery cells lower than the protection voltage;
if the standard occupation ratio is larger than or equal to the occupation ratio of the battery cells with lower protection voltage, judging that the battery cells with higher protection voltage charge electric quantity to the battery cells with lower protection voltage;
and if the standard occupation ratio is smaller than the occupation ratio of the battery cells lower than the protection voltage, the battery cells higher than the protection voltage are charged with electric quantity.
7. The photovoltaic energy storage battery voltage control protection system of claim 1 wherein: the balancing module comprises a rechecking unit, a balancing unit and a balancing unit, wherein the rechecking unit is used for acquiring the part of each battery cell which is higher than the protection voltage and exceeds the protection voltage and calibrating the part as the distribution amount before the battery cell which is higher than the protection voltage charges the battery cell which is lower than the protection voltage;
estimating the loss of the battery monomer higher than the protection voltage in the next detection period according to the predicted value;
and inputting the loss and the distribution into a judging function, and judging whether the battery cell higher than the protection voltage can charge the battery cell lower than the protection voltage.
8. The photovoltaic energy storage battery voltage control protection system of claim 1 wherein: the equalization module comprises a voltage dividing unit, wherein the voltage dividing unit comprises a voltage dividing resistor and is used for dividing the output voltage higher than the energy storage battery pack.
9. The photovoltaic energy storage battery voltage control protection system of claim 1 wherein: after each detection period is finished, counting all battery cells higher than the protection voltage and all battery cells lower than the protection voltage, and inputting the battery cells into a calibration model, wherein:
the calibration model is used for sequencing all the battery cells which meet the judging function and are higher than the protection voltage and the battery cells which are lower than the protection voltage, wherein the battery cells which are higher than the protection voltage are arranged in the sequence from high to low, and the battery cells which are lower than the protection voltage are arranged in the sequence from low to high.
10. A voltage control protection terminal for a photovoltaic energy storage battery pack, applied to the voltage control protection system for the photovoltaic energy storage battery pack according to any one of claims 1 to 9, characterized in that: comprising the following steps:
at least one processor;
and a memory communicatively coupled to the at least one processor;
wherein the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor.
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