Energy storage photovoltaic power station control method and control system thereof

Abstract

The application relates to the technical field of photovoltaic energy storage power station control, in particular to an energy storage photovoltaic power station control method and a control system thereof, which method comprises the following steps: obtaining target parameters and standard parameters corresponding to different energy storage cells in a target cell group; obtaining parameter difference values based on the target parameters and the standard parameters; judging whether the parameter difference values exceed preset difference threshold values; if the parameter difference values do not exceed the preset difference threshold values, performing charging and discharging operations on the target cell group based on preset control rules; if the parameter difference values exceed the preset difference threshold values, obtaining abnormal parameters; obtaining a target processing scheme based on the abnormal parameters; and performing charging and discharging operations on the target cell group based on the preset control rules and the target processing scheme. The application helps to prolong the service life of an energy storage system.

Description

Technical Field

[0001] This application relates to the field of photovoltaic energy storage power station control technology, and in particular to a control method and control system for an energy storage photovoltaic power station. Background Technology

[0002] With the increasing global demand for clean energy, energy storage photovoltaic power stations, as an important distributed energy system, have been widely used. However, existing control methods for energy storage photovoltaic power stations still have many shortcomings in dealing with complex and variable lighting conditions, load demands, and the coordinated operation of energy storage systems and photovoltaic power generation systems.

[0003] Traditional energy storage systems often fail to adequately consider battery lifespan and performance optimization when charging via sunlight or discharging after charging. Prolonged overcharging or over-discharging of the batteries severely reduces their lifespan, ultimately impacting the long-term reliability and economic viability of the energy storage system. Therefore, there is an urgent need for a more intelligent, efficient, and stable control method for photovoltaic energy storage power plants to regulate the charging and discharging of energy storage batteries and extend the lifespan of the energy storage system. Summary of the Invention

[0004] To help extend the lifespan of energy storage systems, this application provides a control method and control system for an energy storage photovoltaic power station.

[0005] Firstly, this application provides a control method for an energy storage photovoltaic power station, which adopts the following technical solution:

[0006] A control method for an energy storage photovoltaic power station, comprising:

[0007] Obtain the target parameters and standard parameters corresponding to different energy storage batteries in the target battery pack;

[0008] Based on the target parameter and the standard parameter, obtain the parameter difference;

[0009] Determine whether the parameter difference exceeds a preset difference threshold;

[0010] If the parameter difference does not exceed the preset difference threshold, then the target battery pack is charged and discharged based on the preset control rules.

[0011] If the parameter difference exceeds the preset difference threshold, then abnormal parameters are obtained;

[0012] Based on the aforementioned abnormal parameters, a target processing solution is obtained;

[0013] Based on the preset control rules and the target processing scheme, the target battery pack is charged and discharged.

[0014] By adopting the above technical solution, the target parameters and standard parameters of different energy storage batteries in the target battery pack are first obtained. Then, the parameter difference is calculated based on the target parameters and standard parameters, and it is determined whether the parameter difference exceeds the preset difference threshold. If it does not exceed the threshold, it indicates that the difference between the target parameters and standard parameters of each energy storage battery is relatively small. In other words, the performance of each energy storage battery is very balanced. During the unified charging and discharging process, there will be no overcharging or over-discharging of one or more energy storage batteries. Therefore, the target battery pack can be charged and discharged directly according to the preset control rules.

[0015] If the difference is exceeded, it indicates that there is a large gap between the target parameters and the standard parameters of the energy storage battery. In other words, the performance of each energy storage battery is not very balanced. During the unified charging and discharging process, one or some energy storage batteries may be overcharged or over-discharged. Therefore, the target battery pack cannot be charged and discharged directly according to the preset control rules. It is necessary to further obtain abnormal parameters, obtain the corresponding target processing scheme based on the abnormal parameters, and finally charge and discharge the target battery pack according to the target processing scheme and the preset control rules.

[0016] Based on the actual conditions of different energy storage batteries in the target battery pack, it is determined whether the performance of each energy storage battery is balanced. Then, based on the determination results, a targeted charging and discharging operation is selected for the target battery pack. This helps to reduce the possibility of overcharging or over-discharging of energy storage batteries in the target battery pack, thereby helping to improve the service life of energy storage batteries and energy storage systems.

[0017] Optionally, obtaining the target processing solution based on the anomaly parameters includes:

[0018] Based on the abnormal parameters, the fault level corresponding to the target battery pack is obtained;

[0019] Determine whether the fault level exceeds a preset level threshold;

[0020] If the fault level does not exceed the preset level threshold, then the charging cutoff capacity and discharging cutoff capacity are obtained based on the standard parameters.

[0021] Based on the parameter difference, the preset control rule, the charging cutoff capacity, and the discharging cutoff capacity, a target processing scheme is obtained.

[0022] If the fault level exceeds the preset level threshold, a target processing solution is obtained based on the fault level and the preset control rules.

[0023] Optionally, determining whether the fault level exceeds a preset level threshold includes:

[0024] Obtain the fault type;

[0025] Determine whether the fault type is the first specified type;

[0026] If the fault type is the first specified type, then the fault level is determined to exceed the preset level threshold.

[0027] If the fault type is not the first specified type, then obtain the number of abnormal batteries and the total number of batteries corresponding to the target battery pack.

[0028] Based on the number of abnormal batteries and the total number of batteries, the percentage of abnormal batteries is obtained;

[0029] Determine whether the percentage of abnormalities exceeds the first percentage threshold;

[0030] If the percentage of abnormalities exceeds the first percentage threshold, then the fault level is determined to exceed the preset level threshold.

[0031] Optionally, obtaining the target processing scheme based on the parameter difference, the preset control rule, the charging cutoff capacity, and the discharging cutoff capacity includes:

[0032] Determine whether the fault type is the second specified type;

[0033] If the fault type is the second specified type, then a target processing solution is obtained based on the parameter difference, the preset control rule, the charging cutoff capacity, and the discharging cutoff capacity.

[0034] If the fault type is not the second specified type, then determine whether a backup battery exists;

[0035] If the backup battery exists, a target processing solution is obtained based on the backup battery and the faulty battery.

[0036] If the backup energy storage battery does not exist, a target processing solution is obtained based on the fault level, the fault type, and the preset control rules.

[0037] Optionally, if the fault type is the second specified type, then obtaining the target processing solution based on the parameter difference, the preset control rule, the charging cutoff capacity, and the discharging cutoff capacity includes:

[0038] If the fault type is the second specified type, then obtain the current mode;

[0039] If the current mode is the charging mode, then the target processing scheme is obtained based on the charging cutoff power, the parameter difference, and the preset control rules;

[0040] If the current mode is a discharge mode, then the target processing scheme is obtained based on the discharge cutoff charge, the parameter difference, and the preset control rules.

[0041] Optionally, determining that the fault level exceeds the preset level threshold if the abnormality percentage exceeds the first percentage threshold includes:

[0042] If the abnormal percentage exceeds the first percentage threshold, then determine whether the abnormal percentage exceeds the anti-uniform percentage;

[0043] If the percentage of abnormalities does not exceed the percentage of anti-unified faults, then the fault level is determined to exceed the preset level threshold.

[0044] If the percentage of abnormalities exceeds the percentage of anti-uniformity, then it is marked, and the number of times it is marked is obtained;

[0045] Determine whether the number of markings exceeds a preset threshold.

[0046] If the number of markings does not exceed the preset number threshold, then the fault level is determined not to exceed the preset level threshold.

[0047] If the number of markings exceeds the preset threshold, then the fault level is determined to exceed the preset level threshold.

[0048] Optionally, if the percentage of anomalies exceeds the percentage of anti-uniformity, then marking is performed, and the number of markings is obtained includes:

[0049] If the percentage of abnormalities exceeds the percentage of anti-uniformity, then it is determined whether the fault types of the abnormal batteries are all of the same type.

[0050] If all the fault types are of the same type, then mark them and obtain the current marking count;

[0051] If the fault types are not the same, then obtain the fault percentage corresponding to different fault types;

[0052] Based on the aforementioned failure percentage, the target failure percentage is obtained;

[0053] Determine whether the target fault percentage exceeds the second percentage threshold;

[0054] If the proportion of the target fault exceeds the second proportion threshold, it is marked, and the current number of markings is obtained.

[0055] Optionally, if the parameter difference does not exceed the preset difference threshold, then performing a charge / discharge operation on the target battery pack based on a preset control rule includes:

[0056] If the parameter difference does not exceed the preset difference threshold, then the unit change rate is obtained based on the target parameter;

[0057] Determine whether the unit rate of change exceeds the rate of change threshold;

[0058] If the unit rate of change exceeds the rate of change threshold, it is determined whether a backup battery pack exists.

[0059] If the backup battery pack exists, then the backup battery pack replaces the target battery pack;

[0060] If the unit rate of change does not exceed the rate of change threshold, then the target battery pack is charged and discharged based on the preset control rules.

[0061] Secondly, this application also discloses a control system for an energy storage photovoltaic power station, which adopts the following technical solution:

[0062] A control system for an energy storage photovoltaic power station includes:

[0063] The first acquisition module is used to acquire the target parameters and standard parameters corresponding to different energy storage batteries in the target battery pack;

[0064] The second acquisition module is used to acquire the parameter difference based on the target parameter and the standard parameter;

[0065] The judgment module is used to determine whether the parameter difference exceeds a preset difference threshold;

[0066] If the parameter difference does not exceed the preset difference threshold, the first execution module is used to perform charging and discharging operations on the target battery pack based on preset control rules.

[0067] If the parameter difference exceeds the preset difference threshold, the third acquisition module is used to acquire abnormal parameters.

[0068] The fourth acquisition module is used to acquire the target processing solution based on the abnormal parameters;

[0069] The second execution module is used to perform charging and discharging operations on the target battery pack based on the preset control rules and the target processing scheme.

[0070] By adopting the above technical solution, the target parameters and standard parameters of different energy storage batteries in the target battery pack are first obtained. Then, the parameter difference is calculated based on the target parameters and standard parameters, and it is determined whether the parameter difference exceeds the preset difference threshold. If it does not exceed the threshold, it indicates that the difference between the target parameters and standard parameters of each energy storage battery is relatively small. In other words, the performance of each energy storage battery is very balanced. During the unified charging and discharging process, there will be no overcharging or over-discharging of one or more energy storage batteries. Therefore, the target battery pack can be charged and discharged directly according to the preset control rules.

[0071] If the difference is exceeded, it indicates that there is a large gap between the target parameters and the standard parameters of the energy storage battery. In other words, the performance of each energy storage battery is not very balanced. During the unified charging and discharging process, one or some energy storage batteries may be overcharged or over-discharged. Therefore, the target battery pack cannot be charged and discharged directly according to the preset control rules. It is necessary to further obtain abnormal parameters, obtain the corresponding target processing scheme based on the abnormal parameters, and finally charge and discharge the target battery pack according to the target processing scheme and the preset control rules.

[0072] Based on the actual conditions of different energy storage batteries in the target battery pack, it is determined whether the performance of each energy storage battery is balanced. Then, based on the determination results, a targeted charging and discharging operation is selected for the target battery pack. This helps to reduce the possibility of overcharging or over-discharging of energy storage batteries in the target battery pack, thereby helping to improve the service life of energy storage batteries and energy storage systems.

[0073] In summary, this application includes the following beneficial technical effects:

[0074] Based on the actual conditions of different energy storage batteries in the target battery pack, it is determined whether the performance of each energy storage battery is balanced. Then, based on the determination results, a targeted charging and discharging operation is selected for the target battery pack. This helps to reduce the possibility of overcharging or over-discharging of energy storage batteries in the target battery pack, thereby helping to improve the service life of energy storage batteries and energy storage systems. Attached Figure Description

[0075] Figure 1 This is a main flowchart of a control method for an energy storage photovoltaic power station according to an embodiment of this application;

[0076] Figure 2 This is a flowchart of steps S201 to S205;

[0077] Figure 3 This is a flowchart of steps S301 to S307;

[0078] Figure 4This is a flowchart of steps S401 to S405;

[0079] Figure 5 This is a flowchart of steps S501 to S503;

[0080] Figure 6 This is a flowchart of steps S601 to S606;

[0081] Figure 7 This is a flowchart of steps S701 to S706;

[0082] Figure 8 This is a flowchart of steps S801 to S805;

[0083] Figure 9 This is a block diagram of a photovoltaic power station control system based on an embodiment of this application.

[0084] Explanation of reference numerals in the attached figures:

[0085] 1. First acquisition module; 2. Second acquisition module; 3. Judgment module; 4. First execution module; 5. Third acquisition module; 6. Fourth acquisition module; 7. Second execution module. Detailed Implementation

[0086] Firstly, this application discloses a control method for an energy storage photovoltaic power station.

[0087] Reference Figure 1 A control method for an energy storage photovoltaic power station, comprising steps S101 to S107:

[0088] Step S101: Obtain the target parameters and standard parameters corresponding to different energy storage batteries in the target battery pack.

[0089] Specifically, the target battery pack is the battery pack that is being charged or discharged. A battery pack contains multiple energy storage batteries, which are connected in series. The target parameters are the real-time parameters of the energy storage batteries, including real-time voltage, real-time temperature, real-time charge, and real-time battery capacity. The standard parameters are the pre-set parameters used to select energy storage batteries. That is, when selecting energy storage batteries in the target battery pack, the standard parameters are used as the selection criteria. In this embodiment, the standard parameters correspond one-to-one with the target parameters.

[0090] Step S102: Obtain the parameter difference based on the target parameter and the standard parameter.

[0091] Specifically, the parameter difference is the difference between the standard parameter and the target parameter. In this embodiment, since there are many types of standard parameters and target parameters, the parameter difference needs to be calculated one by one according to different types. For example, the parameter difference includes voltage difference and battery capacity difference. The voltage difference is the difference obtained by subtracting the target voltage from the standard voltage, and the battery capacity difference is the difference obtained by subtracting the target battery capacity from the standard battery capacity.

[0092] Step S103: Determine whether the parameter difference exceeds the preset difference threshold.

[0093] Specifically, the preset difference threshold is a pre-set standard for judging whether the parameter difference is too large. In this embodiment, the preset parameter threshold varies depending on the type of parameter. For example, the preset difference threshold corresponding to the voltage difference can be 0.2V, and the preset difference threshold corresponding to the battery capacity difference can be 5% of the standard parameter. The preset difference threshold can also be set by the user according to the actual situation or user needs.

[0094] Step S104: If the parameter difference does not exceed the preset difference threshold, then charge and discharge the target battery pack based on the preset control rules.

[0095] Specifically, in this embodiment, the preset control rules are pre-set standards for performing relevant operations on the target battery pack according to different situations.

[0096] Step S105: If the parameter difference exceeds the preset difference threshold, then obtain the abnormal parameter.

[0097] Specifically, in this embodiment, abnormal parameters are parameters whose parameter differences exceed a preset difference threshold, including the type and value of the parameter and the magnitude of the parameter difference.

[0098] Step S106: Obtain the target processing solution based on the abnormal parameters.

[0099] Specifically, in this embodiment, the target processing scheme is the final scheme adopted to perform relevant operations on the target battery pack.

[0100] Step S107: Based on the preset control rules and target processing scheme, perform charging and discharging operations on the target battery pack.

[0101] The energy storage photovoltaic power station control method provided in this embodiment first obtains the target parameters and standard parameters of different energy storage batteries in the target battery pack, then calculates the parameter difference based on the target parameters and standard parameters, and determines whether the parameter difference exceeds the preset difference threshold. If it does not exceed the threshold, it indicates that the difference between the target parameters and standard parameters of each energy storage battery is relatively small. In other words, the performance of each energy storage battery is very balanced. During the unified charging and discharging process, there will be no overcharging or over-discharging of one or more energy storage batteries. Therefore, the target battery pack can be charged and discharged directly according to the preset control rules.

[0102] If the deviation exceeds the standard, it indicates a significant difference between the target parameters and standard parameters of the energy storage battery. In other words, the performance of each energy storage battery is not very balanced. During the unified charging and discharging process, one or more energy storage batteries may experience overcharging or over-discharging. Therefore, the target battery pack cannot be charged and discharged directly according to the preset control rules. It is necessary to further obtain abnormal parameters, obtain the corresponding target processing scheme based on the abnormal parameters, and finally charge and discharge the target battery pack according to the target processing scheme and the preset control rules.

[0103] Based on the actual conditions of different energy storage batteries in the target battery pack, it is determined whether the performance of each energy storage battery is balanced. Then, based on the determination results, a targeted charging and discharging operation is selected for the target battery pack. This helps to reduce the possibility of overcharging or over-discharging of energy storage batteries in the target battery pack, thereby helping to improve the service life of energy storage batteries and energy storage systems.

[0104] Reference Figure 2 In one embodiment of this example, step S106, based on abnormal parameters, to obtain the target processing solution includes steps S201 to S205:

[0105] Step S201: Based on the abnormal parameters, obtain the fault level corresponding to the target battery pack.

[0106] Specifically, the fault level refers to the level of fault corresponding to the target battery pack. The fault level is related to the abnormal parameters. In this embodiment, the correspondence between abnormal parameters and fault levels is preset, and the corresponding fault level can be directly matched according to the abnormal parameters. The fault level can be set from level one to level five, where level one corresponds to the lowest severity and level five corresponds to the highest severity.

[0107] Step S202: Determine whether the fault level exceeds the preset level threshold.

[0108] Specifically, the preset level threshold is a pre-set criterion for judging whether the fault level is too high. In this embodiment, the preset level threshold can be set to three levels.

[0109] Step S203: If the fault level does not exceed the preset level threshold, then obtain the charging cut-off capacity and discharging cut-off capacity based on standard parameters.

[0110] Specifically, the charging cutoff level is the level at which charging must be stopped. Once the energy storage battery reaches the charging cutoff level, charging ceases. Similarly, the discharging cutoff level is the level at which discharging must be stopped. Once the energy storage battery reaches the discharging cutoff level, discharging ceases. In this embodiment, both the charging and discharging cutoff levels are set according to standard parameters, such as the charging cutoff level being 90% or 95% of the energy storage battery capacity, and the discharging cutoff level being 20% ​​or 15% of the energy storage battery capacity. However, it is worth noting that as the energy storage battery is used, both the charging and discharging cutoff levels will change. The situation may change depending on the actual circumstances. For example, the target battery pack consists of 5 energy storage batteries connected in series. Initially, the target voltage of these 5 energy storage batteries is 3.2V, and the discharge cutoff capacity is 20%. If, for some reason, the target voltage of one of the energy storage batteries becomes 3V, during the charging process, as the charging progresses, the energy storage battery with the lower voltage may have a faster voltage rise rate under the same charging current. Therefore, this energy storage battery may reach full charge first, or it may even be overcharged because the charging equipment does not adjust the charging parameters in time. In order to reduce the occurrence of this situation, it is necessary to adjust the charging cutoff capacity of all energy storage batteries in the target battery pack.

[0111] Step S204: Obtain the target processing scheme based on parameter differences, preset control rules, charging cutoff capacity, and discharging cutoff capacity.

[0112] Specifically, the target processing scheme in this case can be to adjust the charging cutoff power and discharging cutoff power according to the parameter difference and preset control rules. In this embodiment, the corresponding situation can also be matched according to historical processing data, so as to select the historical processing scheme under the corresponding situation as the target processing scheme for this time.

[0113] It is worth noting that when there are multiple corresponding historical processing solutions for a given situation, a solution score can be generated based on the specific circumstances of each historical processing solution, and the appropriate historical processing solution can be selected as the target processing solution based on the solution score.

[0114] Step S205: If the fault level exceeds the preset level threshold, then obtain the target processing solution based on the fault level and the preset control rules.

[0115] Specifically, in this embodiment, if the fault level exceeds the preset level threshold, it indicates that the fault in the target battery pack is relatively serious and therefore cannot continue to be used normally. The corresponding target processing scheme can be matched according to the specific severity and preset control rules, such as stopping the charging and discharging function of the target battery pack or replacing the battery pack.

[0116] The energy storage photovoltaic power station control method provided in this embodiment selects the corresponding method to generate a target processing scheme according to different situations, thereby helping the target processing scheme to better solve the problems corresponding to the current situation, and thus helping to improve the service life of the energy storage battery.

[0117] Reference Figure 3 In one embodiment of this example, step S202, determining whether the fault level exceeds a preset level threshold, includes steps S301 to S307:

[0118] Step S301: Obtain the fault type.

[0119] Specifically, in this embodiment, the fault type refers to the type of fault existing in the energy storage battery, including a first designated type, a second designated type, and a third designated type. The first designated type is a fault with very high severity, such as an open circuit or short circuit in the energy storage battery and leakage of the battery pack. The second designated type is a type that will cause the energy storage battery to overcharge or over-discharge, such as the parameter difference corresponding to the battery capacity exceeding the corresponding preset difference threshold and the parameter difference corresponding to the voltage exceeding the corresponding preset difference threshold. The third designated type is the remaining fault type.

[0120] Step S302: Determine whether the fault type is the first specified type.

[0121] Step S303: If the fault type is the first specified type, then the fault level is determined to exceed the preset level threshold.

[0122] Specifically, in this embodiment, if the fault type is the first specified type, it indicates that the fault is very serious, and therefore the fault level is determined to exceed the preset level threshold.

[0123] Step S304: If the fault type is not the first specified type, then obtain the number of abnormal batteries and the total number of batteries corresponding to the target battery pack.

[0124] Specifically, in this embodiment, the number of abnormal batteries is the number of energy storage batteries corresponding to the abnormal parameters, that is, the number of energy storage batteries with abnormalities, and the total number of batteries is the number of energy storage batteries in the target battery pack.

[0125] Step S305: Based on the number of abnormal batteries and the total number of batteries, obtain the percentage of abnormal batteries.

[0126] Specifically, in this embodiment, the abnormality rate is the percentage obtained by dividing the number of abnormalities by the total number of batteries.

[0127] Step S306: Determine whether the abnormal percentage exceeds the first percentage threshold.

[0128] Specifically, the first percentage threshold is the criterion for judging whether the abnormal percentage is too high. In this embodiment, the first percentage threshold can be 5% or other values.

[0129] Step S307: If the abnormal percentage exceeds the first percentage threshold, the fault level is determined to exceed the preset level threshold.

[0130] Specifically, in this embodiment, if the abnormality rate exceeds the first rate threshold, it indicates that multiple energy storage batteries in the target battery pack are abnormal, and therefore the fault level is determined to exceed the preset level threshold.

[0131] The energy storage photovoltaic power station control method provided in this embodiment first determines whether the fault type is a first specified type. If so, it directly determines that the fault level exceeds a preset level threshold. Otherwise, it further determines whether the abnormal proportion exceeds a first proportion threshold. Finally, it determines whether the fault level exceeds the preset level threshold based on the judgment result. By setting dual judgment, corresponding conclusions are generated based on different judgment results, which helps to improve the accuracy of the conclusions and indirectly improves the service life of the energy storage battery.

[0132] Reference Figure 4 In one embodiment of this example, step S204, based on parameter differences, preset control rules, charging cutoff capacity, and discharging cutoff capacity, obtains the target processing scheme, including steps S401 to S405:

[0133] Step S401: Determine whether the fault type is the second specified type.

[0134] Step S402: If the fault type is the second specified type, then obtain the target processing solution based on the parameter difference, preset control rules, charging cut-off capacity and discharging cut-off capacity.

[0135] Specifically, in this embodiment, if the fault type is the second specified type, the target processing solution in this case may be to adjust the charging cut-off power and the discharging cut-off power according to the parameter difference and the preset control rules.

[0136] Step S403: If the fault type is not the second specified type, determine whether a backup battery exists.

[0137] Step S404: If a backup battery exists, obtain the target processing solution based on the backup battery and the faulty battery.

[0138] Specifically, in this embodiment, if a backup battery exists, the backup battery will replace the faulty battery.

[0139] Step S405: If there is no backup energy storage battery, obtain the target handling solution based on the fault level, fault type and preset control rules.

[0140] Specifically, in this embodiment, if there is no backup energy storage battery, the abnormal battery cannot be replaced by a backup battery. Therefore, the corresponding target processing scheme can be matched according to the specific severity and preset control rules, or the corresponding target processing scheme can be matched according to historical processing schemes, etc.

[0141] The energy storage photovoltaic power station control method provided in this embodiment first determines whether the fault type is a second specified type. If so, it obtains a target handling scheme based on parameter differences, preset control rules, charging cut-off capacity, and discharging cut-off capacity. If not, it further determines whether there is a backup battery and finally determines the target handling scheme based on the judgment result. By setting dual judgments, the corresponding target handling scheme is selected according to different judgment results, which helps to improve the fit of the target handling scheme to the current situation and thus helps to improve the service life of the energy storage battery.

[0142] Reference Figure 5 In one embodiment of this example, if the fault type in step S402 is the second specified type, then based on the parameter difference, preset control rules, charging cutoff capacity, and discharging cutoff capacity, the target processing solution is obtained, including steps S501 to S503:

[0143] Step S501: If the fault type is the second specified type, then obtain the current mode.

[0144] Specifically, in this embodiment, the current mode includes charging mode and discharging mode.

[0145] Step S502: If the current mode is charging mode, then obtain the target processing scheme based on the charging cutoff power, parameter difference and preset control rules.

[0146] Specifically, in this embodiment, if the current mode is charging mode, the charging cutoff power is adjusted according to the parameter difference and preset control rules.

[0147] Step S503: If the current mode is discharge mode, the target processing scheme is obtained based on the discharge cutoff capacity, parameter difference and preset control rules.

[0148] Specifically, in this embodiment, if the current mode is the discharge mode, the discharge cutoff charge is adjusted according to the parameter difference and the preset control rules.

[0149] The energy storage photovoltaic power station control method provided in this embodiment selects the corresponding target processing scheme according to the different current modes, thereby helping to reduce erroneous operations that are unsuitable for the current mode and current situation, and thus helping to extend the service life of the energy storage system.

[0150] Reference Figure 6 In one embodiment of this example, if the abnormal percentage exceeds the first percentage threshold, step S307 determines that the fault level exceeds the preset level threshold, which includes steps S601 to S606:

[0151] Step S601: If the abnormal percentage exceeds the first percentage threshold, then determine whether the abnormal percentage exceeds the anti-uniform percentage.

[0152] Specifically, the anti-uniformity ratio is preset. In this embodiment, the anti-uniformity ratio can be set to 90%. When the abnormality ratio exceeds the anti-uniformity ratio, it means that most of the energy storage batteries in the target battery pack are abnormal batteries. For example, the target battery pack consists of 10 energy storage batteries connected in series. The initial battery capacity of the 10 energy storage batteries is 10Ah. The battery capacity of 9 of the energy storage batteries changes from 10Ah to 8Ah. Then, by adjusting the standard parameters, the standard parameters corresponding to the battery capacity can be adjusted to 8Ah. Therefore, the 9 abnormal batteries are converted into normal batteries, and the normal energy storage batteries become abnormal batteries. Thus, the number of abnormal batteries changes from 9 to 1.

[0153] Step S602: If the abnormal percentage does not exceed the anti-uniform percentage, then the fault level is determined to exceed the preset level threshold.

[0154] Specifically, in this embodiment, if the abnormal percentage does not exceed the anti-uniform percentage, it means that the properties of abnormal batteries and normal energy storage batteries cannot be changed by adjusting the standard parameters. However, if the abnormal percentage is relatively high, the fault level is determined to exceed the preset level threshold.

[0155] Step S603: If the percentage of abnormalities exceeds the percentage of anti-uniformity, then mark it and obtain the number of times it is marked.

[0156] Specifically, in this embodiment, if the abnormal proportion exceeds the anti-uniform proportion, it means that the properties of abnormal batteries and normal energy storage batteries can be changed by adjusting the standard parameters. However, in order to prevent the battery performance from failing to meet the corresponding requirements due to too many changes, it is necessary to limit the number of changes. Therefore, after each change, the number of markers is increased.

[0157] Step S604: Determine whether the number of markings exceeds the preset threshold.

[0158] Specifically, in this embodiment, the preset number threshold is the maximum number of times that the properties of abnormal batteries and normal energy storage batteries are allowed to change.

[0159] Step S605: If the number of markings does not exceed the preset threshold, then the fault level is determined to be below the preset threshold.

[0160] Step S606: If the number of markings exceeds the preset threshold, the fault level is determined to exceed the preset level threshold.

[0161] The energy storage photovoltaic power station control method provided in this embodiment determines whether the abnormal proportion exceeds the anti-uniform proportion, and whether the properties of abnormal batteries and normal energy storage batteries can be changed. If it exceeds the limit, it further determines whether the number of markings exceeds a preset threshold, and finally determines whether the fault level exceeds a preset level threshold.

[0162] Reference Figure 7 In one embodiment of this example, if the abnormal percentage exceeds the anti-uniform percentage in step S603, a flag is set, and the number of flags is obtained, including steps S701 to S706:

[0163] Step S701: If the abnormal percentage exceeds the anti-uniform percentage, then determine whether the fault types of the abnormal batteries are all of the same type.

[0164] Step S702: If all fault types are of the same type, mark them and obtain the current marking count.

[0165] Step S703: If the fault types are not the same, obtain the fault percentage corresponding to different fault types.

[0166] Specifically, in this embodiment, the fault percentage refers to the percentage corresponding to different fault types.

[0167] Step S704: Obtain the target failure percentage based on the failure percentage.

[0168] Specifically, in this embodiment, the target fault percentage is the largest fault percentage.

[0169] Step S705: Determine whether the target fault percentage exceeds the second percentage threshold.

[0170] Specifically, in this embodiment, the second percentage threshold is a pre-set criterion for judging whether the percentage of target faults is too large.

[0171] Step S706: If the target fault percentage exceeds the second percentage threshold, mark it and obtain the current marking count.

[0172] Specifically, in this embodiment, if the proportion of the target fault exceeds the second proportion threshold, it indicates that the value of the proportion of the target fault is relatively large. In other words, the fault type corresponding to the proportion of the target fault occupies a major position among all faults. Therefore, this situation can be regarded as the fault type being the same.

[0173] The energy storage photovoltaic power station control method provided in this embodiment does not mark all cases when the abnormal proportion exceeds the anti-uniform proportion. It is necessary to first determine whether the fault types of the abnormal batteries are all of the same type. If so, it is marked directly and the current marking count is obtained. If not, it is further determined whether the target fault proportion exceeds the second proportion threshold. If it does, it is marked. Through dual judgment, the conditions for marking are limited, which helps to improve the accuracy and rigor of the data, thereby improving the accuracy of the marking count.

[0174] Reference Figure 8 In one embodiment of this example, if the parameter difference in step S104 does not exceed a preset difference threshold, then the target battery pack is charged and discharged based on a preset control rule, including steps S801 to S805:

[0175] Step S801: If the parameter difference does not exceed the preset difference threshold, then obtain the unit change rate based on the target parameter.

[0176] Specifically, the unit rate of change is the rate of change of the target parameter per unit time. In this embodiment, the type of target rate of change corresponds one-to-one with the type of target parameter, and the unit time can be 1 minute or other time periods.

[0177] Step S802: Determine whether the unit rate of change exceeds the rate of change threshold.

[0178] Specifically, in this embodiment, the rate of change threshold is a pre-set criterion for judging whether the unit rate of change is too large.

[0179] Step S803: If the unit rate of change exceeds the rate of change threshold, determine whether a backup battery pack exists.

[0180] Step S804: If a spare battery pack exists, replace the target battery pack with the spare battery pack.

[0181] Step S805: If the unit rate of change does not exceed the rate of change threshold, then charge and discharge the target battery pack based on the preset control rules.

[0182] Specifically, in this embodiment, if the unit rate of change does not exceed the rate of change threshold, it indicates that the energy storage battery is normal, and therefore it can be charged and discharged normally according to the preset control rules.

[0183] The energy storage photovoltaic power station control method provided in this embodiment further determines whether the unit rate of change exceeds the rate of change threshold when the parameter difference does not exceed the preset difference threshold, thereby improving the requirements for normal charging and discharging and helping to reduce the occurrence of reduced energy storage battery life due to incorrect charging and discharging.

[0184] Secondly, this application also discloses a control system for an energy storage photovoltaic power station.

[0185] Reference Figure 9 A control system for an energy storage photovoltaic power station, comprising:

[0186] The first acquisition module is used to acquire the target parameters and standard parameters corresponding to different energy storage batteries in the target battery pack;

[0187] The second acquisition module is used to obtain the parameter difference based on the target parameter and the standard parameter;

[0188] The judgment module is used to determine whether the parameter difference exceeds a preset difference threshold.

[0189] If the parameter difference does not exceed the preset difference threshold, the first execution module is used to perform charging and discharging operations on the target battery pack based on the preset control rules.

[0190] The third acquisition module is used to acquire abnormal parameters if the parameter difference exceeds the preset difference threshold.

[0191] The fourth acquisition module is used to obtain the target processing solution based on the abnormal parameters;

[0192] The second execution module is used to perform charging and discharging operations on the target battery pack based on preset control rules and target processing schemes.

[0193] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A control method for an energy storage photovoltaic power plant, characterized in that, The method comprises the following steps: obtaining target parameters corresponding to different energy storage batteries in a target battery pack and standard parameters; obtaining a parameter difference value based on the target parameters and the standard parameters; determining whether the parameter difference value exceeds a preset difference threshold value; if the parameter difference value does not exceed the preset difference threshold value, performing charging and discharging operations on the target battery pack based on a preset control rule; if the parameter difference value exceeds the preset difference threshold value, obtaining an abnormal parameter; obtaining a fault level corresponding to the target battery pack based on the abnormal parameter; obtaining a fault type; determining whether the fault type is a first specified type; if the fault type is the first specified type, determining that the fault level exceeds a preset level threshold value; if the fault type is not the first specified type, obtaining an abnormal battery quantity and a total battery quantity corresponding to the target battery pack; obtaining an abnormal proportion based on the abnormal battery quantity and the total battery quantity; determining whether the abnormal proportion exceeds a first proportion threshold value; if the abnormal proportion exceeds the first proportion threshold value, determining whether the abnormal proportion exceeds an inverse uniform proportion; if the abnormal proportion does not exceed the inverse uniform proportion, determining that the fault level exceeds the preset level threshold value; if the abnormal proportion exceeds the inverse uniform proportion, transforming the properties of abnormal batteries and normal energy storage batteries by adjusting standard parameters, and then performing marking and obtaining a marking frequency after each transformation; determining whether the marking frequency exceeds a preset frequency threshold value; if the marking frequency does not exceed the preset frequency threshold value, determining that the fault level does not exceed the preset level threshold value; if the marking frequency exceeds the preset frequency threshold value, determining that the fault level exceeds the preset level threshold value; obtaining a target processing scheme based on the determination result; performing charging and discharging operations on the target battery pack based on the preset control rule and the target processing scheme.

2. The control method of a power storage photovoltaic power plant according to claim 1, characterized by, The method of obtaining a target processing scheme based on the determination result comprises the following steps: if the fault level does not exceed the preset level threshold value, obtaining a charging cutoff electric quantity and a discharging cutoff electric quantity based on the standard parameters; obtaining a target processing scheme based on the parameter difference value, the preset control rule, the charging cutoff electric quantity, and the discharging cutoff electric quantity; if the fault level exceeds the preset level threshold value, obtaining a target processing scheme based on the fault level and the preset control rule.

3. The control method of a power storage photovoltaic power plant according to claim 2, characterized by, The method of obtaining a target processing scheme based on the parameter difference value, the preset control rule, the charging cutoff electric quantity, and the discharging cutoff electric quantity comprises the following steps: determining whether the fault type is a second specified type; if the fault type is the second specified type, obtaining a target processing scheme based on the parameter difference value, the preset control rule, the charging cutoff electric quantity, and the discharging cutoff electric quantity; if the fault type is not the second specified type, determining whether there is a backup battery; if there is the backup battery, obtaining a target processing scheme based on the backup battery and an abnormal battery. If the backup battery does not exist, a target processing scheme is obtained based on the failure level, the failure type, and the preset control rule.

4. The control method of a power storage photovoltaic power plant according to claim 3, characterized by, If the failure type is the second specified type, a target processing scheme is obtained based on the parameter difference value, the preset control rule, the charge cut-off electric quantity, and the discharge cut-off electric quantity. If the failure type is the second specified type, a current mode is obtained. If the current mode is the charge mode, a target processing scheme is obtained based on the charge cut-off electric quantity, the parameter difference value, and the preset control rule. If the current mode is the discharge mode, a target processing scheme is obtained based on the discharge cut-off electric quantity, the parameter difference value, and the preset control rule.

5. The control method of a power storage photovoltaic power plant according to claim 1, characterized by, If the abnormality proportion exceeds the anti-unification proportion, a mark is made, and a mark frequency is obtained. If the abnormality proportion exceeds the anti-unification proportion, it is determined whether the failure types of the abnormal batteries are all of the same type. If the failure types are all of the same type, a mark is made, and a current mark frequency is obtained. If the failure types are not of the same type, failure proportions corresponding to different failure types are obtained. A target failure proportion is obtained based on the failure proportions. It is determined whether the target failure proportion exceeds a second proportion threshold. If the target failure proportion exceeds the second proportion threshold, a mark is made, and a current mark frequency is obtained.

6. The control method of a power storage photovoltaic power plant according to claim 1, characterized by, If the parameter difference value does not exceed the preset difference threshold, a unit change rate is obtained based on the target parameter, if the parameter difference value does not exceed the preset difference threshold. It is determined whether the unit change rate exceeds a change rate threshold. If the unit change rate exceeds the change rate threshold, it is determined whether a backup battery group exists. If the backup battery group exists, the backup battery group is replaced by the target battery group. If the unit change rate does not exceed the change rate threshold, a charge and discharge operation is performed on the target battery group based on the preset control rule. It includes:

7. A control system for an energy storage photovoltaic power plant for carrying out the method of any one of claims 1 to 6, characterized in that A first obtaining module is configured to obtain target parameters and standard parameters corresponding to different energy storage batteries in a target battery group. A second obtaining module is configured to obtain a parameter difference value based on the target parameters and the standard parameters. A determination module is configured to determine whether the parameter difference value exceeds a preset difference threshold. A first execution module is configured to perform a charge and discharge operation on the target battery group based on a preset control rule, if the parameter difference value does not exceed the preset difference threshold. A third obtaining module is configured to obtain an abnormal parameter, if the parameter difference value exceeds the preset difference threshold. A fourth obtaining module is configured to obtain a target processing scheme based on the abnormal parameter. A second execution module is configured to perform a charge and discharge operation on the target battery group based on the preset control rule and the target processing scheme. ​

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