Charging control method, device and equipment for battery of energy storage system in micro-grid

Abstract

The invention discloses a charging control method, device and equipment for an energy storage system battery in a micro-grid, and relates to the technical field of battery charging, and the method comprises the steps: obtaining a current electric quantity value and a current single voltage of the energy storage system battery in real time when it is determined that the energy storage system battery is in a charging state; and determining the voltage range to which the current single voltage belongs in real time and the charging power corresponding to the voltage range and used for charging the energy storage system battery, and charging the energy storage system battery based on the charging power. The method is used for solving the problem that in the prior art, output of photovoltaic power is limited only according to the electric quantity value, a protection switch of an energy storage system battery trips, the energy storage system battery stops working, and the stability of a micro-grid power supply system is affected, accurate judgment on the state of the energy storage system battery is achieved, and the reliability of the micro-grid power supply system is improved. The tripping phenomenon of the protection switch of the battery of the energy storage system is avoided, and stable operation of a micro-grid power supply system is ensured.

Description

Technical Field

[0001] The present application relates to the field of battery charging technology, and in particular to a charging control method, device and equipment for a battery of an energy storage system in a microgrid. Background Art

[0002] Remote areas without electricity or with weak power grids have always relied on traditional diesel generators to solve local power supply problems, but this power supply method has a series of defects, such as the workload of generator set operation and maintenance, high power generation costs, and emissions that pollute the environment. In order to solve the above problems, photovoltaic power generation is used in the above areas for power generation, but pure photovoltaic power generation has the disadvantages of intermittency, randomness, and uncontrollable power generation output. Therefore, the existing technology adopts a combination of photovoltaic power generation, diesel power generation and energy storage systems to build a safe, efficient and reliable microgrid power supply system.

[0003] The existing microgrid power supply system provides the battery value of the energy storage system through the battery management system of the energy storage system, and limits the output of photovoltaic power when the battery value is determined to be greater than a certain set upper limit. However, in actual working conditions, the battery value provided by the battery management system cannot truly reflect the actual state of the battery of the energy storage system, which causes the protection switch of the battery of the energy storage system to trip, and the battery of the energy storage system stops working, which affects the stability of the microgrid power supply system. Summary of the invention

[0004] In response to the above-mentioned problems and technical needs, the applicant has proposed a charging control method, device and equipment for a battery in an energy storage system in a microgrid, so as to solve the problem in the prior art that the output of photovoltaic power is limited only according to the power value, the protection switch of the energy storage system battery trips, the energy storage system battery stops working, and the stability of the microgrid power supply system is affected. The method can accurately determine the state of the battery in the energy storage system, avoid the occurrence of the protection switch of the battery in the energy storage system tripping, and ensure the stable operation of the microgrid power supply system.

[0005] The present application provides a charging control method for a battery in an energy storage system in a microgrid, the method comprising:

[0006] When determining that the energy storage system battery is in a charging state, obtaining the current power value of the energy storage system battery in real time;

[0007] In the case where it is determined that the current power value is greater than a first preset power value, obtaining in real time the current single cell voltage of the battery of the energy storage system, wherein the first preset power value is less than a power value that can cause the protection switch of the battery of the energy storage system to trip;

[0008] When it is determined that the current single cell voltage is less than a first preset voltage, the voltage range to which the current single cell voltage belongs and the charging power for charging the energy storage system battery corresponding to the voltage range are determined in real time, and the energy storage system battery is charged based on the charging power, wherein the first preset voltage is less than a voltage that can cause the protection switch of the energy storage system battery to trip.

[0009] According to a charging control method for a battery of an energy storage system in a microgrid in one embodiment of the present application, the voltage range includes: a first sub-range, an upper limit value of the first sub-range is a second preset voltage, and the first preset voltage is greater than the second preset voltage;

[0010] Determining the voltage range to which the current cell voltage belongs and the charging power for charging the energy storage system battery corresponding to the voltage range includes:

[0011] Determining that the current cell voltage belongs to the first sub-range, and obtaining a charging power corresponding to the first sub-range based on a first calculation formula;

[0012] Wherein, the first calculation formula includes:

[0013]

[0014] Among them, P t Indicates charging power, SOC H Indicates the first preset power value, SOC t Indicates the current power value, SOC H-σ Indicates the second preset power value, P B Indicates the rated charging power of the energy storage system battery, C B Represents the charging rate, which is a constant value, and the first preset power value is greater than the second preset power value.

[0015] According to a charging control method for a battery of an energy storage system in a microgrid in one embodiment of the present application, the voltage range includes: a second sub-range, a lower limit value of the second sub-range is the second preset voltage, and an upper limit value of the second sub-range is the first preset voltage;

[0016] Determining the voltage range to which the current cell voltage belongs and the charging power for charging the energy storage system battery corresponding to the voltage range includes:

[0017] Determining that the current cell voltage belongs to the second sub-range, and obtaining a charging power corresponding to the second sub-range based on a second calculation formula;

[0018] Wherein, the second calculation formula includes:

[0019]

[0020] Among them, P t Indicates charging power, V HH Represents the first preset voltage, V t Indicates the current single cell voltage, V H represents a second preset voltage, the first preset voltage is greater than the second preset voltage, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value.

[0021] According to a charging control method for a battery of an energy storage system in a microgrid according to an embodiment of the present application, the method further includes:

[0022] When it is determined that the current cell voltage is greater than or equal to the first preset voltage, determining the discharge power of the energy storage system battery corresponding to the current cell voltage based on a third calculation formula, and discharging the energy storage system battery based on the discharge power;

[0023] Wherein, the third calculation formula includes:

[0024]

[0025] Among them, P t Indicates charging power, V HH Represents the first preset voltage, V t Indicates the current single cell voltage, V H represents a second preset voltage, the first preset voltage is greater than the second preset voltage, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value.

[0026] According to a charging control method for a battery of an energy storage system in a microgrid according to an embodiment of the present application, the method further includes:

[0027] When it is determined that the current power value is less than or equal to the first preset power value and greater than the second preset power value, a charging power for charging the energy storage system battery corresponding to the current power value is obtained based on a first calculation formula;

[0028] Wherein, the first calculation formula includes:

[0029]

[0030] Among them, P t Indicates charging power, SOC H Indicates the first preset power value, SOC t Indicates the current power value, SOCH-σ Indicates the second preset power value, P B Indicates the rated charging power of the energy storage system battery, C B Represents the charging rate, which is a constant value, and the first preset power value is greater than the second preset power value.

[0031] According to a charging control method for a battery of an energy storage system in a microgrid according to an embodiment of the present application, the method further includes:

[0032] When it is determined that the current power value is less than or equal to the second preset power value, a charging power for charging the energy storage system battery corresponding to the current power value is obtained based on a fourth calculation formula, wherein the first preset power value is greater than the second preset power value;

[0033] Among them, the fourth calculation formula includes:

[0034] P t =P B ×C B ;

[0035] Among them, P t Indicates charging power, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value.

[0036] According to a charging control method for a battery of an energy storage system in a microgrid according to an embodiment of the present application, when the current power value is greater than the first preset power value and the current single cell voltage belongs to the first sub-range, It decreases with the increase of monomer voltage.

[0037] According to a charging control method for a battery of an energy storage system in a microgrid according to an embodiment of the present application, when the current power value is less than or equal to the first preset power value and greater than the second preset power value, It decreases with the increase of monomer voltage.

[0038] The embodiment of the present application also provides a charging control device for a battery of an energy storage system in a microgrid, comprising:

[0039] A first acquisition module is used to acquire the current power value of the energy storage system battery in real time when it is determined that the energy storage system battery is in a charging state;

[0040] A second acquisition module is used to acquire the current single cell voltage of the battery of the energy storage system in real time when it is determined that the current power value is greater than a first preset power value, wherein the first preset power value is less than a power value that can cause the protection switch of the battery of the energy storage system to trip;

[0041] A charging control module is used to determine in real time the voltage range to which the current single cell voltage belongs and the charging power for charging the energy storage system battery corresponding to the voltage range when it is determined that the current single cell voltage is less than a first preset voltage, and to charge the energy storage system battery based on the charging power, wherein the first preset voltage is less than a voltage that can cause the protection switch of the energy storage system battery to trip.

[0042] An embodiment of the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the charging control method for the battery of the energy storage system in the microgrid are implemented as described in any one of the above items.

[0043] The charging control method, device and equipment of the energy storage system battery in the microgrid provided by the embodiment of the present application obtains the current power value of the energy storage system battery in real time when it is determined that the energy storage system battery is in a charging state; when it is determined that the current power value is greater than a first preset power value, obtains the current single cell voltage of the energy storage system battery in real time, wherein the first preset power value is less than the power value that can cause the protection switch of the energy storage system battery to trip. It can be seen that the present application obtains the single cell voltage of the energy storage system battery before the power value of the energy storage system battery may cause the protection switch of the energy storage system battery to trip, so as to avoid the single cell voltage from exceeding the limit; further, when determining the current single cell voltage When the voltage of the single cell is less than the first preset voltage, the voltage range to which the current single cell voltage belongs and the charging power for charging the energy storage system battery corresponding to the voltage range are determined in real time, and the energy storage system battery is charged based on the charging power, wherein the first preset voltage is less than the voltage that can cause the protection switch of the energy storage system battery to trip. It can be seen that the present application monitors the actual state of the energy storage system battery in real time through the power value and the single cell voltage to effectively adjust and control the charging power of the energy storage system battery, thereby preventing the protection switch of the energy storage system battery from tripping and the energy storage system battery from stopping working, which affects the stability of the microgrid power supply system, thereby improving the stability and sustainability of the microgrid power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 It is one of the flow charts of the charging control method of the battery of the energy storage system in the microgrid provided in the embodiment of the present application;

[0046] Figure 2 This is a second flow chart of a charging control method for a battery of an energy storage system in a microgrid provided in an embodiment of the present application;

[0047] Figure 3 is a relationship diagram between the equity coefficient and the power value provided in the embodiment of the present application;

[0048] Figure 4 is a graph showing the relationship between the equity coefficient and the cell voltage provided in the embodiment of the present application;

[0049] Figure 5 It is a structural schematic diagram of a charging control device for a battery of an energy storage system in a microgrid provided in an embodiment of the present application;

[0050] Figure 6 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The embodiment of the present application provides a charging control method for a battery in an energy storage system in a microgrid. The method can be applied to a smart terminal or a server. Some other descriptions in the embodiment of the present application are for illustrative purposes only and are not intended to limit the scope of protection of the present application. They will not be described one by one. The specific implementation of the method is as follows Figure 1 As shown:

[0053] Step 101, when it is determined that the battery of the energy storage system is in a charging state, the current power value of the battery of the energy storage system is obtained in real time.

[0054] Specifically, the power value can be obtained through a battery management system of the energy storage system battery.

[0055] Step 102: When it is determined that the current power value is greater than the first preset power value, the current single cell voltage of the battery of the energy storage system is obtained in real time.

[0056] The first preset power value is smaller than the power value that can cause the protection switch of the energy storage system battery to trip.

[0057] Step 103, when it is determined that the current cell voltage is less than the first preset voltage, determine in real time the voltage range to which the current cell voltage belongs and the charging power for charging the energy storage system battery corresponding to the voltage range, and charge the energy storage system battery based on the charging power.

[0058] The first preset voltage is lower than a voltage that can cause a protection switch of a battery in the energy storage system to trip.

[0059] The charging control method of the energy storage system battery in the microgrid provided in the embodiment of the present application obtains the current power value of the energy storage system battery in real time when it is determined that the energy storage system battery is in a charging state; when it is determined that the current power value is greater than a first preset power value, obtains the current single cell voltage of the energy storage system battery in real time, wherein the first preset power value is less than the power value that can cause the protection switch of the energy storage system battery to trip. It can be seen that the present application obtains the single cell voltage of the energy storage system battery before the power value of the energy storage system battery may cause the protection switch of the energy storage system battery to trip, so as to avoid the single cell voltage from exceeding the limit; further, when it is determined that the current single cell voltage is less than the first preset power value, the single cell voltage of the energy storage system battery is obtained in real time. Under a preset voltage, the voltage range to which the current single cell voltage belongs and the charging power for charging the energy storage system battery corresponding to the voltage range are determined in real time, and the energy storage system battery is charged based on the charging power, wherein the first preset voltage is less than the voltage that can cause the protection switch of the energy storage system battery to trip. It can be seen that the present application monitors the actual state of the energy storage system battery in real time through the power value and the single cell voltage to effectively adjust and control the charging power of the energy storage system battery, thereby preventing the protection switch of the energy storage system battery from tripping and the energy storage system battery from stopping working, which affects the stability of the microgrid power supply system, thereby improving the stability and sustainability of the microgrid power supply system.

[0060] Specifically, in order to effectively prevent the problem that the protection switch of the energy storage system battery trips and the energy storage system battery stops working, the present application determines the voltage range by analyzing historical data, and when the current power value of the energy storage system battery is greater than the first preset power value, the charging power is adjusted based on the determined voltage range.

[0061] The voltage range includes two voltage limits, the first voltage limit is a first preset voltage, the second voltage limit is a second preset voltage, and the first preset voltage is greater than the second preset voltage.

[0062] The two voltage limits divide the voltage range into three parts: the part less than the second preset voltage, namely the first sub-range; the part greater than or equal to the second preset voltage and less than the first preset voltage, namely the second sub-range; and the part greater than or equal to the first preset voltage, namely the third sub-range.

[0063] Among them, regarding the setting of the specific values ​​of the first preset voltage and the second preset voltage, the user can set them according to their actual operating requirements and actual operating conditions, and this application does not impose any restrictions on this.

[0064] In a specific embodiment, the voltage range includes: a first sub-range, and the upper limit value of the first sub-range is a second preset voltage. The specific implementation of determining the voltage range to which the current cell voltage belongs and the charging power corresponding to the voltage range for charging the energy storage system battery includes:

[0065] It is determined that the current cell voltage belongs to a first sub-range, and a charging power corresponding to the first sub-range is obtained based on a preset first calculation formula.

[0066] The first calculation formula is shown in formula (1):

[0067]

[0068] Among them, P t Indicates charging power, SOC H Indicates the first preset power value, SOC t Indicates the current power value, SOC H-σ Indicates the second preset power value, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value. The first preset power value is greater than the second preset power value.

[0069] Among them, the specific numerical values ​​of the first preset power value and the second preset power value can be set by the user according to his or her actual operating needs and actual operating conditions, and this application does not impose any restrictions on this.

[0070] In a specific embodiment, the voltage range includes: a second sub-range, the lower limit of the second sub-range is a second preset voltage, and the upper limit of the second sub-range is a first preset voltage. The specific implementation of determining the voltage range to which the current cell voltage belongs and the charging power corresponding to the voltage range for charging the energy storage system battery includes:

[0071] It is determined that the current cell voltage belongs to the second sub-range, and the charging power corresponding to the second sub-range is obtained based on a preset second calculation formula.

[0072] The second calculation formula is shown in formula (2):

[0073]

[0074] Among them, P t Indicates charging power, V HH Represents the first preset voltage, V t Indicates the current single cell voltage, VH represents the second preset voltage, the first preset voltage is greater than the second preset voltage, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value.

[0075] In a specific embodiment, the method further includes: when it is determined that the current single cell voltage is greater than or equal to the first preset voltage, determining the discharge power of the energy storage system battery corresponding to the current single cell voltage based on a preset third calculation formula, and discharging the energy storage system battery based on the discharge power.

[0076] The third calculation formula is shown in formula (3):

[0077]

[0078] Among them, P t Indicates charging power, V HH Represents the first preset voltage, V t Indicates the current single cell voltage, V H represents the second preset voltage, the first preset voltage is greater than the second preset voltage, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value.

[0079] In a specific embodiment, after obtaining the current power value of the energy storage system battery, when it is determined that the current power value is less than or equal to the first preset power value and greater than the second preset power value, the charging power for charging the energy storage system battery corresponding to the current power value is obtained based on a preset first calculation formula.

[0080] The first calculation formula is shown in formula (1):

[0081]

[0082] Among them, P t Indicates charging power, SOC H Indicates the first preset power value, SOC t Indicates the current power value, SOC H-σ Indicates the second preset power value, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value. The first preset power value is greater than the second preset power value.

[0083] In a specific embodiment, the method further includes: when it is determined that the current power value is less than or equal to the second preset power value, obtaining the charging power for charging the energy storage system battery corresponding to the current power value based on a preset fourth calculation formula.

[0084] The fourth calculation formula is shown in formula (4):

[0085] P t =P B ×C B …… ...

[0086] Among them, P t Indicates charging power, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value.

[0087] In a specific embodiment, when the current power value is greater than the first preset power value and the current cell voltage belongs to the first sub-range, It decreases with the increase of single cell voltage.

[0088] In a specific embodiment, when the current power value is less than or equal to the first preset power value and greater than the second preset power value, It decreases with the increase of single cell voltage.

[0089] Next, through Figure 2 The following is a detailed description of this application:

[0090] Step 201, when the energy storage system battery is in a charging state, determine the power balance relationship of the energy storage system battery in the microgrid.

[0091] The expression of power balance relationship is shown in formula (5):

[0092] P PV =PL oad +C Bk ×P B ……………………………………(5)

[0093] Among them, P PV Indicates electrical power, PL oad +C Bk ×P B Indicates the power generation, P B Indicates the rated charging power of the energy storage system battery, C Bk is the initial charge rate.

[0094] The power supply power is determined based on the power balance relationship.

[0095] Step 202: configure a first preset power value, a second preset power value, a first preset voltage, and a second preset voltage.

[0096] The first preset power value is less than the power value that can cause the protection switch of the energy storage system battery to trip.

[0097] If the difference between the first preset power value and the power value that can cause the protection switch of the energy storage system battery to trip is small enough, the setting of the first preset power value can be infinitely close to the power value that can cause the protection switch of the energy storage system battery to trip, and there is a certain risk at this time. To solve this problem, an adjustment factor σ is introduced, and the corresponding power value after the introduction of the adjustment factor is the second preset power value.

[0098] This is equivalent to adding an equity coefficient k under the premise that the rated charging power and charging rate of the energy storage system battery are determined. t The charging factor C Bk The optimization is performed, that is, C Bk =C B ×k t .

[0099] Step 203, obtaining the current power value in real time.

[0100] Step 204, determining whether the current power value is less than or equal to the second preset power value, if so, executing step 205, otherwise executing step 206.

[0101] Step 205: determine the supply power based on the fourth calculation formula, and use the determined charging power to charge the energy storage system battery.

[0102] Among them, the equity coefficient is equal to 1 under the current electricity value.

[0103] Step 206 , determining whether the current power value is greater than the second preset power value and less than or equal to the first preset power value, if so, executing step 207 , otherwise, executing step 208 .

[0104] Step 207: determine the supply power based on the first calculation formula, and use the determined charging power to charge the energy storage system battery.

[0105] Among them, in the case of the current power value, the equity coefficient is a dynamically changing value. The equity coefficient is inversely proportional to the power value. The equity coefficient decreases as the power value increases. For details, please refer to Figure 3 By dynamically and linearly adjusting the equity coefficient within a range greater than the second preset power value and less than or equal to the first preset power value, the charging power of the photovoltaic system to the battery of the energy storage system is gradually reduced.

[0106] Among them, Figure 3 The horizontal axis SOC represents the power value, and the vertical axis k t Represents equity coefficient, SOC H The corresponding equity coefficient is 1, SOCH-σ The corresponding equity coefficient is k t，soc .

[0107] In the case of the current electricity value, the calculation formula of the equity coefficient is shown in formula (6):

[0108]

[0109] Step 208 , determining whether the current power value is greater than the first preset power value, if so, executing step 209 , otherwise, executing step 203 .

[0110] Step 209, obtaining the current cell voltage of the battery of the energy storage system.

[0111] Step 210 , determining whether the current cell voltage is less than a second preset voltage, if so, executing step 211 , otherwise, executing step 212 .

[0112] Step 211, determine the power supply power based on the first calculation formula, and use the determined charging power to charge the energy storage system battery.

[0113] Step 212, determining whether the current cell voltage is greater than or equal to the second preset voltage and less than the first preset voltage, if so, executing step 213, otherwise, executing step 214.

[0114] Step 213: determine the power supply power based on the second calculation formula, and use the determined charging power to charge the energy storage system battery.

[0115] In the case of the current cell voltage, the equity coefficient is a dynamically changing value. The equity coefficient is inversely proportional to the cell voltage. The equity coefficient decreases as the cell voltage increases. For details, see Figure 4 By dynamically and linearly adjusting the equity coefficient within a range greater than or equal to the second preset voltage and less than the first preset voltage, the charging power of the photovoltaic system to the battery of the energy storage system is gradually reduced.

[0116] Among them, Figure 4 The horizontal axis V represents the cell voltage, and the vertical axis k t represents the equity coefficient, V H The corresponding equity coefficient is k t，soc , V HH The corresponding equity coefficient is k v，soc .

[0117] Under the current cell voltage, the calculation formula of the equity coefficient is shown in formula (7):

[0118]

[0119] Step 214 , determining whether the current cell voltage is greater than or equal to the first preset voltage, if so, executing step 215 , otherwise, executing step 209 .

[0120] Step 215 , determining the discharge power of the energy storage system battery corresponding to the current single cell voltage based on a preset third calculation formula, and discharging the energy storage system battery based on the discharge power.

[0121] Under the current monomer voltage, the calculation formula of the equity coefficient is shown in formula (8):

[0122]

[0123] Specifically, during the process of determining that the battery of the energy storage system is continuously discharging, the current power value is monitored, and when the current power value is less than the second preset power value, step 204 is executed.

[0124] The present application controls and adjusts the power of the photovoltaic system to charge the battery of the energy storage system by combining the battery power and the battery cell voltage, which can effectively solve the problem in the prior art of using a single battery power for charging, resulting in the battery voltage exceeding the limit and the switch being disconnected, affecting the normal operation of the battery, thereby improving the stability and sustainability of the microgrid operation and reducing the operation and maintenance workload of the microgrid system.

[0125] The embodiment of the present application also provides a charging control device for a battery in an energy storage system in a microgrid. The specific implementation of the device can refer to the description of the charging control method for a battery in an energy storage system in a microgrid, and the repetitive parts will not be repeated. Figure 5 As shown, the device comprises:

[0126] The first acquisition module 501 is used to acquire the current power value of the energy storage system battery in real time when it is determined that the energy storage system battery is in a charging state;

[0127] A second acquisition module 502 is used to acquire the current single cell voltage of the energy storage system battery in real time when it is determined that the current power value is greater than a first preset power value, wherein the first preset power value is less than a power value that can cause the protection switch of the energy storage system battery to trip;

[0128] The charging control module 503 is used to determine in real time the voltage range to which the current single cell voltage belongs and the charging power for charging the energy storage system battery corresponding to the voltage range when it is determined that the current single cell voltage is less than the first preset voltage, and to charge the energy storage system battery based on the charging power, wherein the first preset voltage is less than the voltage that can cause the protection switch of the energy storage system battery to trip.

[0129] In a specific embodiment, the voltage range includes: a first sub-range, the upper limit value of the first sub-range is a second preset voltage, and the first preset voltage is greater than the second preset voltage; a charging control module 503 is used to determine that the current single cell voltage belongs to the first sub-range, and obtain the charging power corresponding to the first sub-range based on the first calculation formula;

[0130] The first calculation formula includes:

[0131]

[0132] Among them, P t Indicates charging power, SOC H Indicates the first preset power value, SOC t Indicates the current power value, SOC H-σ Indicates the second preset power value, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value. The first preset power value is greater than the second preset power value.

[0133] In a specific embodiment, the voltage range includes: a second sub-range, a lower limit value of the second sub-range is a second preset voltage, and an upper limit value of the second sub-range is a first preset voltage; a charging control module 503 is used to determine that the current single cell voltage belongs to the second sub-range, and obtain a charging power corresponding to the second sub-range based on a second calculation formula;

[0134] The second calculation formula includes:

[0135]

[0136] Among them, P t Indicates charging power, V HH Represents the first preset voltage, V t Indicates the current single cell voltage, V H represents the second preset voltage, the first preset voltage is greater than the second preset voltage, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value.

[0137] In a specific embodiment, the device further includes a discharge control module, which is used to determine the discharge power of the energy storage system battery corresponding to the current single cell voltage based on a third calculation formula when it is determined that the current single cell voltage is greater than or equal to the first preset voltage, and discharge the energy storage system battery based on the discharge power;

[0138] The third calculation formula includes:

[0139]

[0140] Among them, P t Indicates charging power, V HH Represents the first preset voltage, V t Indicates the current single cell voltage, V H represents the second preset voltage, the first preset voltage is greater than the second preset voltage, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value.

[0141] In a specific embodiment, the charging control module 503 is further configured to obtain, based on a first calculation formula, a charging power for charging the energy storage system battery corresponding to the current power value when it is determined that the current power value is less than or equal to the first preset power value and greater than the second preset power value;

[0142] The first calculation formula includes:

[0143]

[0144] Among them, P t Indicates charging power, SOC H Indicates the first preset power value, SOC t Indicates the current power value, SOC H-σ Indicates the second preset power value, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value. The first preset power value is greater than the second preset power value.

[0145] In a specific embodiment, the charging control module 503 is further configured to obtain, based on a fourth calculation formula, a charging power for charging the energy storage system battery corresponding to the current power value when it is determined that the current power value is less than or equal to the second preset power value, wherein the first preset power value is greater than the second preset power value;

[0146] Among them, the fourth calculation formula includes:

[0147] P t =P B ×C B ;

[0148] Among them, P t Indicates charging power, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value.

[0149] In a specific embodiment, when the current power value is greater than the first preset power value and the current cell voltage belongs to the first sub-range, It decreases with the increase of single cell voltage.

[0150] In a specific embodiment, when the current power value is less than or equal to the first preset power value and greater than the second preset power value, It decreases with the increase of single cell voltage.

[0151] Figure 6 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 6 As shown, the electronic device may include: a processor 601, a communication interface 602, a memory 603 and a communication bus 604, wherein the processor 601, the communication interface 602 and the memory 603 communicate with each other through the communication bus 604. The processor 601 may call the logic instructions in the memory 603 to execute the charging control method of the energy storage system battery in the microgrid, the method comprising: when it is determined that the energy storage system battery is in a charging state, obtaining the current power value of the energy storage system battery in real time; when it is determined that the current power value is greater than the first preset power value, obtaining the current single cell voltage of the energy storage system battery in real time, wherein the first preset power value is less than the power value that can cause the protection switch of the energy storage system battery to trip; when it is determined that the current single cell voltage is less than the first preset voltage, determining in real time the voltage range to which the current single cell voltage belongs, and the charging power corresponding to the voltage range for charging the energy storage system battery, and charging the energy storage system battery based on the charging power, wherein the first preset voltage is less than the voltage that can cause the protection switch of the energy storage system battery to trip.

[0152] In addition, the logic instructions in the above-mentioned memory 603 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0153] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the charging control method of the energy storage system battery in the microgrid provided by the above methods, the method comprising: when it is determined that the energy storage system battery is in a charging state, obtaining the current power value of the energy storage system battery in real time; when it is determined that the current power value is greater than a first preset power value, obtaining the current single cell voltage of the energy storage system battery in real time, wherein the first preset power value is less than the power value that can cause the protection switch of the energy storage system battery to trip; when it is determined that the current single cell voltage is less than the first preset voltage, determining in real time the voltage range to which the current single cell voltage belongs, and the charging power for charging the energy storage system battery corresponding to the voltage range, and charging the energy storage system battery based on the charging power, wherein the first preset voltage is less than the voltage that can cause the protection switch of the energy storage system battery to trip.

[0154] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the processor executes the charging control method for the battery of the energy storage system in the microgrid provided by the above-mentioned embodiments, the method comprising: when it is determined that the battery of the energy storage system is in a charging state, obtaining the current power value of the battery of the energy storage system in real time; when it is determined that the current power value is greater than a first preset power value, obtaining the current single cell voltage of the battery of the energy storage system in real time, wherein the first preset power value is less than the power value that can cause the protection switch of the battery of the energy storage system to trip; when it is determined that the current single cell voltage is less than the first preset voltage, determining in real time the voltage range to which the current single cell voltage belongs, and the charging power for charging the battery of the energy storage system corresponding to the voltage range, and charging the battery of the energy storage system based on the charging power, wherein the first preset voltage is less than the voltage that can cause the protection switch of the battery of the energy storage system to trip.

[0155] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative work.

[0156] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0157] Finally, it should be noted that the above is only the preferred implementation of the present application, and the present application is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present application should be considered to be included in the scope of protection of the present application.

Claims

1. A charging control method for a battery of an energy storage system in a microgrid, characterized in that: The method comprises: When determining that the energy storage system battery is in a charging state, obtaining the current power value of the energy storage system battery in real time; In the case where it is determined that the current power value is greater than a first preset power value, obtaining in real time the current single cell voltage of the battery of the energy storage system, wherein the first preset power value is less than a power value that can cause the protection switch of the battery of the energy storage system to trip; When it is determined that the current single cell voltage is less than a first preset voltage, the voltage range to which the current single cell voltage belongs and the charging power for charging the energy storage system battery corresponding to the voltage range are determined in real time, and the energy storage system battery is charged based on the charging power, wherein the first preset voltage is less than a voltage that can cause the protection switch of the energy storage system battery to trip.

2. The charging control method for the battery of the energy storage system in the microgrid according to claim 1 is characterized in that: The voltage range includes: a first sub-range, the upper limit of the first sub-range is a second preset voltage, and the first preset voltage is greater than the second preset voltage; Determining the voltage range to which the current cell voltage belongs and the charging power for charging the energy storage system battery corresponding to the voltage range includes: Determining that the current cell voltage belongs to the first sub-range, and obtaining a charging power corresponding to the first sub-range based on a first calculation formula; Wherein, the first calculation formula includes: Among them, P t Indicates charging power, SOC H Indicates the first preset power value, SOC t Indicates the current power value, SOC H-σ Indicates the second preset power value, P B Indicates the rated charging power of the energy storage system battery, C B Represents the charging rate, which is a constant value, and the first preset power value is greater than the second preset power value.

3. The charging control method for the battery of the energy storage system in the microgrid according to claim 1 is characterized in that: The voltage range includes: a second sub-range, a lower limit value of the second sub-range is the second preset voltage, and an upper limit value of the second sub-range is the first preset voltage; Determining the voltage range to which the current cell voltage belongs and the charging power for charging the energy storage system battery corresponding to the voltage range includes: Determining that the current cell voltage belongs to the second sub-range, and obtaining a charging power corresponding to the second sub-range based on a second calculation formula; Wherein, the second calculation formula includes: Among them, P t Indicates charging power, V HH Represents the first preset voltage, V t Indicates the current single cell voltage, V H represents a second preset voltage, the first preset voltage is greater than the second preset voltage, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value.

4. The charging control method for the battery of the energy storage system in the microgrid according to claim 1, characterized in that: The method further comprises: When it is determined that the current cell voltage is greater than or equal to the first preset voltage, determining the discharge power of the energy storage system battery corresponding to the current cell voltage based on a third calculation formula, and discharging the energy storage system battery based on the discharge power; Wherein, the third calculation formula includes: Among them, P t Indicates charging power, V HH Represents the first preset voltage, V t Indicates the current single cell voltage, V H represents a second preset voltage, the first preset voltage is greater than the second preset voltage, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value.

5. The charging control method for the battery of the energy storage system in the microgrid according to claim 1, characterized in that: The method further comprises: When it is determined that the current power value is less than or equal to the first preset power value and greater than the second preset power value, a charging power for charging the energy storage system battery corresponding to the current power value is obtained based on a first calculation formula; Wherein, the first calculation formula includes: Among them, P t Indicates charging power, SOC H Indicates the first preset power value, SOC t Indicates the current power value, SOC H-σ Indicates the second preset power value, P B Indicates the rated charging power of the energy storage system battery, C B Represents the charging rate, which is a constant value, and the first preset power value is greater than the second preset power value.

6. The charging control method for the battery of the energy storage system in the microgrid according to claim 1, characterized in that: The method further comprises: When it is determined that the current power value is less than or equal to the second preset power value, a charging power for charging the energy storage system battery corresponding to the current power value is obtained based on a fourth calculation formula, wherein the first preset power value is greater than the second preset power value; Among them, the fourth calculation formula includes: P t =P B ×C B ; Among them, P t Indicates charging power, P B Indicates the rated charging power of the energy storage system battery, C B Indicates the charging rate, which is a fixed value.

7. The charging control method for the battery of the energy storage system in the microgrid according to claim 2, characterized in that: When the current power value is greater than the first preset power value and the current cell voltage belongs to the first sub-range, It decreases with the increase of monomer voltage.

8. The charging control method for the battery of the energy storage system in the microgrid according to claim 5, characterized in that: When the current power value is less than or equal to the first preset power value and greater than the second preset power value, It decreases with the increase of monomer voltage.

9. A charging control device for a battery in an energy storage system in a microgrid, characterized in that: The device comprises: A first acquisition module is used to acquire the current power value of the energy storage system battery in real time when it is determined that the energy storage system battery is in a charging state; A second acquisition module is used to acquire the current single cell voltage of the battery of the energy storage system in real time when it is determined that the current power value is greater than a first preset power value, wherein the first preset power value is less than a power value that can cause the protection switch of the battery of the energy storage system to trip; A charging control module is used to determine in real time the voltage range to which the current single cell voltage belongs and the charging power for charging the energy storage system battery corresponding to the voltage range when it is determined that the current single cell voltage is less than a first preset voltage, and to charge the energy storage system battery based on the charging power, wherein the first preset voltage is less than a voltage that can cause the protection switch of the energy storage system battery to trip.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the charging control method for the battery of the energy storage system in the microgrid are implemented as described in any one of claims 1 to 8.

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