CN117252457A - Storage battery service life assessment system for photovoltaic power generation system - Google Patents
Storage battery service life assessment system for photovoltaic power generation system Download PDFInfo
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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
- H02J7/005—Detection of state of health [SOH]
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- 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
- H02J7/00302—Overcharge 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
- H02J7/00304—Overcurrent protection
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Abstract
The invention discloses a storage battery life assessment system for a photovoltaic power generation system, which belongs to the field of photovoltaic power generation and is used for solving the problem that the current storage battery life assessment is limited to self state data of a storage battery.
Description
Technical Field
The invention belongs to the field of photovoltaic power generation, relates to a storage battery life assessment technology, and particularly relates to a storage battery life assessment system for a photovoltaic power generation system.
Background
Photovoltaic power generation is based on the principle of photovoltaic effect, and solar energy is directly converted into electric energy by using a solar cell. The photovoltaic power generation system mainly comprises three parts of a solar panel (component), a controller and an inverter, wherein the three parts mainly comprise electronic components, but do not relate to mechanical parts. Among them, the photovoltaic power generation equipment has the advantages: the equipment is refined, reliable and stable, long in service life and convenient to install and maintain. In theory, the photovoltaic power generation technology can be used for any occasion needing power supply, namely, up to a spacecraft, down to a household power supply, up to a megawatt power station, down to a toy, and the photovoltaic power supply can be ubiquitous.
At present, the service life evaluation of the storage battery is often limited to state data of the storage battery, and influences of a charging end and a discharging end on the service life of the storage battery are not fully considered, so that intervention in a charging and discharging process is not timely enough, and unnecessary service life damage is caused to the storage battery.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a storage battery service life assessment system for a photovoltaic power generation system.
The technical problems to be solved by the invention are as follows:
how to realize intelligent evaluation of the service life of the storage battery for photovoltaic power generation based on the data of the charging and discharging ends.
The aim of the invention can be achieved by the following technical scheme:
the storage battery service life assessment system for the photovoltaic power generation system comprises a management terminal, a data acquisition module, a damage assessment module, a state analysis module, a health assessment module and a monitoring center, wherein the management terminal is used for importing battery specification data of a photovoltaic storage battery and uploading the battery specification data of the photovoltaic storage battery to the monitoring center, and the monitoring center sends the battery specification data of the photovoltaic storage battery to the damage assessment module and the state analysis module;
the data acquisition module is used for acquiring historical behavior data of the photovoltaic storage battery and sending the historical behavior data to the monitoring center, and the monitoring center sends the historical behavior data of the photovoltaic storage battery to the damage assessment module;
the damage evaluation module is used for comprehensively evaluating the service life damage of the photovoltaic storage battery, the service life damage value of the photovoltaic storage battery obtained by evaluation is sent to the monitoring center, and the monitoring center sends the service life damage value of the photovoltaic storage battery to the health evaluation module;
the data acquisition module is also used for acquiring the static state data of the photovoltaic storage battery and sending the static state data of the photovoltaic storage battery to the monitoring center, and the monitoring center sends the static state data of the photovoltaic storage battery to the state analysis module;
the state analysis module is used for analyzing the life attenuation state of the photovoltaic storage battery, analyzing the life attenuation level of the photovoltaic storage battery and sending the obtained life attenuation level to the monitoring center, and the monitoring center sends the life attenuation level of the photovoltaic storage battery to the health evaluation module;
the health evaluation module is used for evaluating the charge and discharge health of the photovoltaic storage battery, and the health evaluation result of the photovoltaic storage battery obtained by evaluation is sent to the monitoring center; the monitoring center is connected with a display, and the display is used for displaying the life decay level and the health evaluation result of the photovoltaic storage battery.
Further, the battery specification data are the terminal charging voltage, the terminal discharging voltage, the safe current interval, the initial capacitance, the rated voltage and the initial internal resistance of the photovoltaic storage battery;
the charging behavior data comprise a charging duration, a discharging duration, a historical voltage curve and a historical current curve of the photovoltaic storage battery, wherein the historical voltage curve is a voltage change curve of the photovoltaic storage battery in the charging duration and the discharging duration, and similarly, the historical current curve is a current change curve of the photovoltaic storage battery in the charging duration and the discharging duration;
the real-time state data includes a rest voltage, a rest capacitance and a rest internal resistance of the photovoltaic storage battery, and the rest state data is collected at an interval period between charging and discharging of the photovoltaic storage battery.
Further, the evaluation process of the damage evaluation module specifically comprises the following steps:
reading battery specification data of the photovoltaic storage battery to obtain a termination charging voltage, a termination discharging voltage and a safety current interval, and reading historical behavior data of the photovoltaic storage battery to obtain a charging duration time, a discharging duration time, a historical voltage curve and a historical current curve of the photovoltaic storage battery;
drawing an overcharge standard line and an overdischarge standard line parallel to an x axis by using the values of the termination charge voltage and the termination discharge voltage in a plane rectangular coordinate system xOy where the historical voltage curve is located, and drawing a charge ending time line and a discharge ending time line parallel to a y axis by using a charge duration and a discharge duration; the intersection point of the historical voltage curve and the overcharge standard line is the overcharge starting time, the intersection point of the historical voltage curve and the overdischarge standard line is the overdischarge starting time, and the scribing line respectively correspond to the overcharge ending time and the overdischarge ending time when the charging is ended; the x-axis represents the production time of the photovoltaic storage battery, and the y-axis represents the historical voltage of the photovoltaic storage battery;
dividing the part of the historical voltage curve above the overcharge standard line and the part below the overdischarge standard line by a scribing line when charging is finished and a scribing line when discharging is finished to obtain an overcharge state area and an overdischarge state area of the photovoltaic storage battery, and calculating the area GCQ of the overcharge state area and the area GFQ of the overdischarge state area;
comparing the current change curve with a safe current interval from left to right;
if the current change curve is not in the safe current interval and the duration is smaller than the judging duration threshold or the current change curve is in the safe current interval, the abnormal current times are not counted;
if the current change curve is not in the safe current interval and the duration time length is greater than or equal to the judging time length threshold value, counting the current abnormality times once to obtain current abnormality times IE of the photovoltaic storage battery; the method is characterized in that the value of the judging duration threshold is larger than zero, and when the current value of the photovoltaic storage battery does not belong to a safe current interval and the duration of the abnormal state exceeds the judging duration threshold, the photovoltaic storage battery is damaged by irreversible service life;
calculating a life damage value HS of the photovoltaic storage battery according to a formula HS=GCQ×s1+ GFQ ×s2+IE×s3; wherein s1, s2 and s3 are proportionality coefficients of fixed values, and the values of s1, s2 and s3 are all larger than zero.
Further, the analysis process of the state analysis module is specifically as follows:
reading battery specification data and standing state data of the photovoltaic storage battery to obtain initial capacitance, rated voltage, initial internal resistance, standing voltage, standing capacitance and standing internal resistance of the photovoltaic storage battery;
subtracting the static capacitance from the initial capacitance to obtain the capacitance attenuation RS of the photovoltaic storage battery, subtracting the static voltage from the rated voltage to obtain the voltage attenuation VS of the photovoltaic storage battery, and subtracting the initial internal resistance from the static internal resistance to obtain the internal resistance increment RZ of the photovoltaic storage battery;
calculating a life attenuation coefficient SX of the photovoltaic storage battery according to a formula SX= (RS×v1+RZ×v2+VS×v3)/t; wherein v1, v2 and v3 are weight coefficients with fixed values, the values of v1, v2 and v3 are all larger than zero, v1+v2+v3=1, and t is the production duration of the photovoltaic storage battery;
comparing the life attenuation coefficient of the photovoltaic storage battery with the standard life attenuation coefficient stored in the monitoring center;
if the life attenuation coefficient is smaller than or equal to the first standard life attenuation coefficient, judging that the life attenuation level of the photovoltaic storage battery is the first life attenuation level;
if the life attenuation coefficient is larger than the first standard life attenuation coefficient and smaller than or equal to the second standard life attenuation coefficient, judging that the life attenuation level of the photovoltaic storage battery is the second life attenuation level;
and if the life attenuation coefficient is larger than the second standard life attenuation coefficient, judging that the life attenuation level of the photovoltaic storage battery is the third life attenuation level.
Further, the first standard life decay factor has a value less than the value of the second standard life decay factor, the values of both the first standard life decay factor and the second standard life decay factor being greater than zero;
the first life reduction level is lower than the second life reduction level, which is lower than the third life reduction level;
the life attenuation coefficient is positively correlated with the life attenuation speed of the photovoltaic storage battery, and the higher the grade of the life attenuation grade is, the faster the life attenuation speed of the photovoltaic storage battery is.
Further, the evaluation process of the health evaluation module is specifically as follows:
grouping and numbering the photovoltaic storage batteries according to the service life attenuation grade to obtain a first photovoltaic sample group, a second photovoltaic sample group and a third photovoltaic sample group;
respectively comparing the life damage values of the photovoltaic storage batteries in the first photovoltaic sample group, the second photovoltaic sample group and the third photovoltaic sample group with corresponding life damage threshold values;
if the life damage value is smaller than the corresponding life damage threshold value, judging that the health evaluation result of the photovoltaic storage battery is normal life decay;
and if the life damage value is greater than or equal to the corresponding life damage threshold value, judging that the health evaluation result of the photovoltaic storage battery is abnormal exogenous damage.
Further, the first photovoltaic sample group corresponds to a first life damage threshold, the second photovoltaic sample group corresponds to a second life damage threshold, and the third photovoltaic sample group corresponds to a third life damage threshold;
the first life damage threshold, the second life damage threshold and the third life damage threshold are all greater than zero in value, the first life damage threshold is less than the second life damage threshold, and the second life damage threshold is less than the third life damage threshold.
Further, the staff overhauls and adjusts the photovoltaic storage battery and the photovoltaic power generation matrix according to the life decay level and the health evaluation result of the displayed photovoltaic storage battery.
Further, if the life decay level of the photovoltaic storage battery is the first life decay level and the health evaluation result is normal life decay, not performing any operation;
if the life attenuation level of the photovoltaic storage battery is the first life attenuation level and the health evaluation result is abnormal exogenous damage, initially adjusting the charge and discharge period of the photovoltaic power generation matrix;
if the life decay level of the photovoltaic storage battery is the second life decay level and the health evaluation result is normal life decay, carrying out targeted overhaul on the photovoltaic storage battery;
if the life attenuation level of the photovoltaic storage battery is the second life attenuation level and the health evaluation result is abnormal exogenous damage, the photovoltaic storage battery is subjected to targeted maintenance, and meanwhile, the charge and discharge period of the photovoltaic power generation matrix is further adjusted;
if the life decay level of the photovoltaic storage battery is the third life decay level and the health evaluation result is the normal life decay, replacing the photovoltaic storage battery;
and if the life attenuation level of the photovoltaic storage battery is the third life attenuation level and the health evaluation result is abnormal exogenous damage, comprehensively adjusting the charge and discharge period of the photovoltaic power generation matrix and checking and replacing the photovoltaic storage batteries one by one.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, firstly, the service life damage of the photovoltaic storage battery is comprehensively assessed through the damage assessment module, the service life damage value of the photovoltaic storage battery is assessed and obtained and is sent to the health assessment module, meanwhile, the rest state data of the photovoltaic storage battery is collected and is sent to the state analysis module, the state analysis module is utilized to analyze the service life attenuation state of the photovoltaic storage battery, the service life attenuation level of the photovoltaic storage battery is obtained through analysis and is sent to the health assessment module, and the health assessment result of the photovoltaic storage battery is assessed and obtained through the health assessment module.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
FIG. 1 is an overall system block diagram of the present invention;
FIG. 2 is a schematic diagram illustrating the operation of the damage assessment module according to the present invention;
FIG. 3 is a schematic diagram illustrating another operation of the damage assessment module according to the present invention;
fig. 4 is a schematic diagram of the operation of the damage assessment module according to the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In an embodiment, referring to fig. 1 to 4, a battery life assessment system for a photovoltaic power generation system is now provided, which includes a management terminal, a data acquisition module, a damage assessment module, a status analysis module, a health assessment module, and a monitoring center; in the embodiment, the photovoltaic power generation square matrix is preferably a photovoltaic power generation system, and the photovoltaic power generation square matrix is connected with a plurality of photovoltaic storage batteries through a circuit;
the management terminal is used for importing battery specification data of the photovoltaic storage battery and uploading the battery specification data of the photovoltaic storage battery to the monitoring center, and the monitoring center sends the battery specification data of the photovoltaic storage battery to the damage assessment module and the state analysis module; the battery specification data are the termination charging voltage, the termination discharging voltage, the safe current interval, the initial capacitance, the rated voltage and the initial internal resistance of the photovoltaic storage battery;
the specific explanation is that the photovoltaic storage battery can still continue to charge after the charging is completed, when the real-time voltage of the photovoltaic storage battery reaches the end charging voltage, the continuous charging can cause overcharge, the cycle life of the photovoltaic storage battery is reduced, and similarly, when the real-time voltage of the photovoltaic storage battery reaches the end discharging voltage in the discharging process, the continuous discharging can cause overdischarge, so that the internal resistance of the battery is increased, and the service life of the battery is influenced, in the embodiment, the end charging voltage of the photovoltaic storage battery is set to be 1.2 times of the rated voltage, the end discharging voltage is set to be 0.6 times of the rated voltage, for example, the rated voltage of the photovoltaic storage battery is 3.7V, the end charging voltage of the photovoltaic storage battery is 4.2V, and the end discharging voltage of the photovoltaic storage battery is 2.5V;
the data acquisition module is used for acquiring historical behavior data of the photovoltaic storage battery and sending the historical behavior data to the monitoring center, and the monitoring center sends the historical behavior data of the photovoltaic storage battery to the damage assessment module; the charging behavior data comprise a charging duration, a discharging duration, a historical voltage curve and a historical current curve of the photovoltaic storage battery; the historical voltage curve is a voltage change curve of the photovoltaic storage battery in the charging duration and the discharging duration, and similarly, the historical current curve is a current change curve of the photovoltaic storage battery in the charging duration and the discharging duration;
the damage assessment module is used for comprehensively assessing service life damage of the photovoltaic storage battery, and the assessment process is specifically as follows:
reading battery specification data of the photovoltaic storage battery to obtain a termination charging voltage, a termination discharging voltage and a safety current interval, and reading historical behavior data of the photovoltaic storage battery to obtain a charging duration time, a discharging duration time, a historical voltage curve and a historical current curve of the photovoltaic storage battery;
as shown in fig. 2 and 3, in a planar rectangular coordinate system xOy in which the history voltage curve is located, an overcharge standard line and an overdischarge standard line parallel to the x-axis are drawn with values of the termination charge voltage and the termination discharge voltage, and a charge end time score line and a discharge end time score line parallel to the y-axis are drawn with a charge duration and a discharge duration; the intersection point of the historical voltage curve and the overcharge standard line is the overcharge starting time, the intersection point of the historical voltage curve and the overdischarge standard line is the overdischarge starting time, and the scribing line respectively correspond to the overcharge ending time and the overdischarge ending time when the charging is ended; the x-axis represents the production time of the photovoltaic storage battery, and the y-axis represents the historical voltage of the photovoltaic storage battery;
dividing the part of the historical voltage curve above the overcharge standard line and the part below the overdischarge standard line by a scribing line when charging is finished and a scribing line when discharging is finished to obtain an overcharge state area and an overdischarge state area of the photovoltaic storage battery, and calculating the area GCQ of the overcharge state area and the area GFQ of the overdischarge state area;
as shown in fig. 4, the current change curve is compared with the safe current interval from left to right;
if the current change curve is not in the safe current interval and the duration is smaller than the judging duration threshold or the current change curve is in the safe current interval, the abnormal current times are not counted;
if the current change curve is not in the safe current interval and the duration time length is greater than or equal to the judging time length threshold value, counting the current abnormality times once to obtain current abnormality times IE of the photovoltaic storage battery; the method is characterized in that the value of the judging duration threshold is larger than zero, and when the current value of the photovoltaic storage battery does not belong to a safe current interval and the duration of the abnormal state exceeds the judging duration threshold, the photovoltaic storage battery is damaged by irreversible service life;
and calculating a life damage value HS of the photovoltaic storage battery according to a formula, wherein the formula is specifically as follows:
hs=gcq×s1+ GFQ ×s2+ie×s3; wherein s1, s2 and s3 are proportionality coefficients with fixed values, and the values of s1, s2 and s3 are all larger than zero;
the damage evaluation module sends the life damage value of the photovoltaic storage battery to a monitoring center, and the monitoring center sends the life damage value of the photovoltaic storage battery to the health evaluation module;
the data acquisition module is also used for acquiring the static state data of the photovoltaic storage battery and sending the static state data of the photovoltaic storage battery to the monitoring center, and the monitoring center sends the static state data of the photovoltaic storage battery to the state analysis module; the real-time state data comprise the standing voltage, the standing capacitance and the standing internal resistance of the photovoltaic storage battery, and the standing state data of the photovoltaic storage battery are collected in the interval period between charging and discharging in the embodiment;
the state analysis module is used for analyzing the life attenuation state of the photovoltaic storage battery, and the analysis process is specifically as follows:
reading battery specification data and standing state data of the photovoltaic storage battery to obtain initial capacitance, rated voltage, initial internal resistance, standing voltage, standing capacitance and standing internal resistance of the photovoltaic storage battery;
subtracting the static capacitance from the initial capacitance to obtain the capacitance attenuation RS of the photovoltaic storage battery, subtracting the static voltage from the rated voltage to obtain the voltage attenuation VS of the photovoltaic storage battery, and subtracting the initial internal resistance from the static internal resistance to obtain the internal resistance increment RZ of the photovoltaic storage battery;
calculating a life attenuation coefficient SX of the photovoltaic storage battery according to a formula SX= (RS×v1+RZ×v2+VS×v3)/t; wherein v1, v2 and v3 are weight coefficients with fixed values, the values of v1, v2 and v3 are all larger than zero, v1+v2+v3=1, and t is the production duration of the photovoltaic storage battery;
comparing the life attenuation coefficient of the photovoltaic storage battery with the standard life attenuation coefficient stored in the monitoring center;
if the life attenuation coefficient is smaller than or equal to the first standard life attenuation coefficient, judging that the life attenuation level of the photovoltaic storage battery is the first life attenuation level;
if the life attenuation coefficient is larger than the first standard life attenuation coefficient and smaller than or equal to the second standard life attenuation coefficient, judging that the life attenuation level of the photovoltaic storage battery is the second life attenuation level;
if the life attenuation coefficient is larger than the second standard life attenuation coefficient, judging that the life attenuation level of the photovoltaic storage battery is a third life attenuation level;
wherein the value of the first standard life decay coefficient is smaller than the value of the second standard life decay coefficient, the values of the first standard life decay coefficient and the second standard life decay coefficient are both greater than zero, the level of the first life decay level is lower than the level of the second life decay level, and the level of the second life decay level is lower than the level of the third life decay level; it can be understood that the life attenuation coefficient is positively correlated with the life attenuation speed of the photovoltaic storage battery, and the higher the level of the life attenuation level is, the faster the life attenuation speed of the photovoltaic storage battery is;
the state analysis module sends the life attenuation grade of the photovoltaic storage battery to a monitoring center, and the monitoring center sends the life attenuation grade of the photovoltaic storage battery to the health evaluation module;
the health evaluation module is used for charge and discharge health evaluation of the photovoltaic storage battery, and the evaluation process is specifically as follows:
grouping and numbering the photovoltaic storage batteries according to the service life attenuation grade to obtain a first photovoltaic sample group, a second photovoltaic sample group and a third photovoltaic sample group;
respectively comparing the life damage values of the photovoltaic storage batteries in the first photovoltaic sample group, the second photovoltaic sample group and the third photovoltaic sample group with corresponding life damage threshold values;
if the life damage value is smaller than the corresponding life damage threshold value, judging that the health evaluation result of the photovoltaic storage battery is normal life decay;
if the life damage value is greater than or equal to the corresponding life damage threshold value, judging that the health evaluation result of the photovoltaic storage battery is abnormal exogenous damage;
the first life damage threshold, the second life damage threshold and the third life damage threshold are all larger than zero, the first life damage threshold is smaller than the second life damage threshold, and the second life damage threshold is smaller than the third life damage threshold;
the state analysis module sends the health evaluation result of the photovoltaic storage battery to a monitoring center; the monitoring center is connected with a display, the display is used for displaying the life decay level and the health evaluation result of the photovoltaic storage battery, and a worker overhauls and adjusts the photovoltaic storage battery and the photovoltaic power generation square matrix according to the displayed life decay level and the health evaluation result of the photovoltaic storage battery;
in this embodiment, if the life degradation level of the photovoltaic storage battery is the first life degradation level and the health evaluation result is the normal life degradation, no operation is performed;
if the life attenuation level of the photovoltaic storage battery is the first life attenuation level and the health evaluation result is abnormal exogenous damage, initially adjusting the charge and discharge period of the photovoltaic power generation matrix;
if the life decay level of the photovoltaic storage battery is the second life decay level and the health evaluation result is normal life decay, carrying out targeted overhaul on the photovoltaic storage battery;
if the life attenuation level of the photovoltaic storage battery is the second life attenuation level and the health evaluation result is abnormal exogenous damage, the photovoltaic storage battery is subjected to targeted maintenance, and meanwhile, the charge and discharge period of the photovoltaic power generation matrix is further adjusted;
if the life decay level of the photovoltaic storage battery is the third life decay level and the health evaluation result is the normal life decay, replacing the photovoltaic storage battery;
if the life attenuation level of the photovoltaic storage battery is the third life attenuation level and the health evaluation result is abnormal exogenous damage, comprehensively adjusting the charge and discharge period of the photovoltaic power generation matrix and checking and replacing the photovoltaic storage batteries one by one; specifically, the regulation mode of the charge-discharge period of the photovoltaic power generation matrix is that the charge-discharge scheme of shallow charge is taken as the main charge-discharge scheme of shallow charge, and the charge-discharge scheme of deep charge is periodically carried out;
in the present application, if a corresponding calculation formula appears, the above calculation formulas are all dimensionality-removed and numerical calculation, and the size of the weight coefficient, the scale coefficient and other coefficients existing in the formulas is a result value obtained by quantizing each parameter, so long as the proportional relation between the parameter and the result value is not affected.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (10)
1. The storage battery life assessment system for the photovoltaic power generation system is characterized by comprising a management terminal, a data acquisition module, a damage assessment module, a state analysis module, a health assessment module and a monitoring center, wherein the management terminal is used for importing battery specification data of a photovoltaic storage battery and uploading the battery specification data of the photovoltaic storage battery to the monitoring center, and the monitoring center sends the battery specification data of the photovoltaic storage battery to the damage assessment module and the state analysis module;
the data acquisition module is used for acquiring historical behavior data of the photovoltaic storage battery and sending the historical behavior data to the monitoring center, and the monitoring center sends the historical behavior data of the photovoltaic storage battery to the damage assessment module; the damage evaluation module is used for comprehensively evaluating the service life damage of the photovoltaic storage battery, the service life damage value of the photovoltaic storage battery obtained by evaluation is sent to the monitoring center, and the monitoring center sends the service life damage value of the photovoltaic storage battery to the health evaluation module;
the data acquisition module is also used for acquiring the static state data of the photovoltaic storage battery and sending the static state data of the photovoltaic storage battery to the monitoring center, and the monitoring center sends the static state data of the photovoltaic storage battery to the state analysis module; the state analysis module is used for analyzing the life attenuation state of the photovoltaic storage battery, analyzing the life attenuation level of the photovoltaic storage battery and sending the obtained life attenuation level to the monitoring center, and the monitoring center sends the life attenuation level of the photovoltaic storage battery to the health evaluation module;
the health evaluation module is used for evaluating the charge and discharge health of the photovoltaic storage battery, and the health evaluation result of the photovoltaic storage battery obtained by evaluation is sent to the monitoring center; the monitoring center is connected with a display, and the display is used for displaying the life decay level and the health evaluation result of the photovoltaic storage battery.
2. The battery life assessment system for a photovoltaic power generation system according to claim 1, wherein the battery specification data is a terminal charge voltage, a terminal discharge voltage, a safe current interval, an initial capacity, a rated voltage, and an initial internal resistance of the photovoltaic battery;
the charging behavior data comprise a charging duration, a discharging duration, a historical voltage curve and a historical current curve of the photovoltaic storage battery, wherein the historical voltage curve is a voltage change curve of the photovoltaic storage battery in the charging duration and the discharging duration, and similarly, the historical current curve is a current change curve of the photovoltaic storage battery in the charging duration and the discharging duration;
the real-time state data includes a rest voltage, a rest capacitance and a rest internal resistance of the photovoltaic storage battery, and the rest state data is collected at an interval period between charging and discharging of the photovoltaic storage battery.
3. The battery life assessment system for a photovoltaic power generation system according to claim 2, wherein the assessment process of the damage assessment module is specifically as follows:
acquiring a termination charging voltage, a termination discharging voltage and a safe current interval of the photovoltaic storage battery, and then acquiring a charging duration time, a discharging duration time, a historical voltage curve and a historical current curve of the photovoltaic storage battery;
drawing an overcharge standard line and an overdischarge standard line parallel to an x axis by using the values of the termination charge voltage and the termination discharge voltage in a plane rectangular coordinate system where the historical voltage curve is located, and drawing a charge ending time line and a discharge ending time line parallel to a y axis by using a charge duration and a discharge duration;
dividing a part of the historical voltage curve above the overcharge standard line and a part of the historical voltage curve below the overdischarge standard line by a scribing line when charging is finished and a scribing line when discharging is finished to obtain an overcharge state area and an overdischarge state area of the photovoltaic storage battery, and calculating the area of the overcharge state area and the area of the overdischarge state area;
comparing the current change curve with a safe current interval from left to right;
if the current change curve is not in the safe current interval and the duration is smaller than the judging duration threshold or the current change curve is in the safe current interval, the abnormal current times are not counted;
if the current change curve is not in the safe current interval and the duration time is greater than or equal to the judging time threshold, counting the current abnormality times for one time to obtain the current abnormality times of the photovoltaic storage battery; the value of the judging duration threshold is larger than zero, and when the current value of the photovoltaic storage battery does not belong to a safe current interval and the duration of the abnormal state exceeds the judging duration threshold, the photovoltaic storage battery is damaged by irreversible service life;
and calculating the life damage value of the photovoltaic storage battery.
4. The battery life evaluation system for a photovoltaic power generation system according to claim 3, wherein an intersection of the history voltage curve and the overcharge standard line is an overcharge start time, an intersection of the history voltage curve and the overdischarge standard line is an overdischarge start time, and the scribe line at the end of charge and the scribe line at the end of discharge correspond to an overcharge end time and an overdischarge end time, respectively; the x-axis represents the production duration of the photovoltaic battery and the y-axis represents the historical voltage of the photovoltaic battery.
5. The battery life assessment system for a photovoltaic power generation system according to claim 2, wherein the analysis process of the state analysis module is specifically as follows:
obtaining initial capacitance, rated voltage, initial internal resistance, standing voltage, standing capacitance and standing internal resistance of the photovoltaic storage battery;
subtracting the static capacitance from the initial capacitance to obtain the capacitance attenuation of the photovoltaic storage battery, subtracting the static voltage from the rated voltage to obtain the voltage attenuation of the photovoltaic storage battery, and subtracting the initial internal resistance from the static internal resistance to obtain the internal resistance increase of the photovoltaic storage battery;
and calculating the life attenuation coefficient of the photovoltaic storage battery, comparing the life attenuation coefficient of the photovoltaic storage battery with the standard life attenuation coefficient stored in the monitoring center, and judging the life attenuation level of the photovoltaic storage battery as a first life attenuation level, a second life attenuation level or a third life attenuation level.
6. The battery life assessment system for a photovoltaic power generation system of claim 5, wherein the first life decay level is lower than the second life decay level, and the second life decay level is lower than the third life decay level;
the life attenuation coefficient is positively correlated with the life attenuation speed of the photovoltaic storage battery, and the higher the grade of the life attenuation grade is, the faster the life attenuation speed of the photovoltaic storage battery is.
7. The battery life assessment system for a photovoltaic power generation system of claim 5, wherein the health assessment module comprises the following specific assessment procedures:
grouping and numbering the photovoltaic storage batteries according to the service life attenuation grade to obtain a first photovoltaic sample group, a second photovoltaic sample group and a third photovoltaic sample group;
respectively comparing the life damage values of the photovoltaic storage batteries in the first photovoltaic sample group, the second photovoltaic sample group and the third photovoltaic sample group with corresponding life damage threshold values;
if the life damage value is smaller than the corresponding life damage threshold value, judging that the health evaluation result of the photovoltaic storage battery is normal life decay;
and if the life damage value is greater than or equal to the corresponding life damage threshold value, judging that the health evaluation result of the photovoltaic storage battery is abnormal exogenous damage.
8. The battery life assessment system for a photovoltaic power generation system of claim 7, wherein the first photovoltaic sample set corresponds to a first life damage threshold, the second photovoltaic sample set corresponds to a second life damage threshold, and the third photovoltaic sample set corresponds to a third life damage threshold;
the first life damage threshold, the second life damage threshold and the third life damage threshold are all greater than zero in value, the first life damage threshold is less than the second life damage threshold, and the second life damage threshold is less than the third life damage threshold.
9. The battery life assessment system for a photovoltaic power generation system according to claim 1, wherein the operator overhauls and adjusts the photovoltaic battery and the photovoltaic power generation matrix based on the displayed life decay level and the health assessment result of the photovoltaic battery.
10. The battery life assessment system for a photovoltaic power generation system according to claim 9, wherein if the life degradation level of the photovoltaic battery is a first life degradation level and the health assessment result is a normal life degradation, no operation is performed;
if the life attenuation level of the photovoltaic storage battery is the first life attenuation level and the health evaluation result is abnormal exogenous damage, initially adjusting the charge and discharge period of the photovoltaic power generation matrix;
if the life decay level of the photovoltaic storage battery is the second life decay level and the health evaluation result is normal life decay, carrying out targeted overhaul on the photovoltaic storage battery;
if the life attenuation level of the photovoltaic storage battery is the second life attenuation level and the health evaluation result is abnormal exogenous damage, the photovoltaic storage battery is subjected to targeted maintenance, and meanwhile, the charge and discharge period of the photovoltaic power generation matrix is further adjusted;
if the life decay level of the photovoltaic storage battery is the third life decay level and the health evaluation result is the normal life decay, replacing the photovoltaic storage battery;
and if the life attenuation level of the photovoltaic storage battery is the third life attenuation level and the health evaluation result is abnormal exogenous damage, comprehensively adjusting the charge and discharge period of the photovoltaic power generation matrix and checking and replacing the photovoltaic storage batteries one by one.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118409220A (en) * | 2024-07-01 | 2024-07-30 | 东方旭能(山东)科技发展有限公司 | Prediction system and prediction method for service life of battery |
| CN118425785A (en) * | 2024-05-07 | 2024-08-02 | 东莞市希冀智能科技有限公司 | Lithium battery life prediction method based on big data method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118425785A (en) * | 2024-05-07 | 2024-08-02 | 东莞市希冀智能科技有限公司 | Lithium battery life prediction method based on big data method |
| CN118409220A (en) * | 2024-07-01 | 2024-07-30 | 东方旭能(山东)科技发展有限公司 | Prediction system and prediction method for service life of battery |
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