A substation battery active balancing device with monitoring function

Abstract

The invention discloses a substation battery active balancing device with a monitoring function, which relates to the technical field of power equipment and comprises a target marking unit, a region division unit, a temperature anomaly discrimination unit, an online monitoring unit, a balancing adjustment unit and a battery evaluation unit. The invention establishes a substation space model and obtains the distribution sites of single battery cells, divides a number of target monitoring areas according to the distribution density of the distribution sites of single battery cells, identifies regional temperature anomalies, and further identifies battery balancing needs after judging whether there are temperature anomaly areas in the overall monitoring area, performs balanced discharge and balanced charging on single battery cells in the abnormal area exceeding a balancing degree threshold, and judges the balancing effect of the single battery cells, so as to ensure that the battery reaches a qualified working state after being balancing and adjusted, and improves the recognition accuracy of balancing needs through real-time monitoring of thermal management, thereby ensuring the efficiency of the balancing system.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to a substation battery active balancing device with a monitoring function. Background Art

[0002] A battery equalizer, also known as a battery balancer, is an electronic protection device that prevents the voltage imbalance between the cells inside the battery from causing a decrease in service life. When the voltage between the cells is unbalanced, the charging and discharging speeds of different cells are different. While one cell is fully charged, other cells are in an overcharged or undercharged state. Overcharging or undercharging will damage the battery, causing the battery capacity to decrease and the life to be shortened. A battery equalizer can ensure the balance of power between the cells in real time, thereby extending the battery life by 5-30%. A battery equalizer is an energy transfer equalizer that can compensate the battery in both directions. When the voltage difference between the batteries connected in series exceeds 10 millivolts, the battery equalizer starts to work, and the current will flow from the battery with higher voltage to the battery with lower voltage, eventually balancing the batteries. It can be connected to the batteries connected in series for a long time, automatically maintaining the balanced state of the battery without maintenance.

[0003] The balancing management of lithium-powered battery packs includes voltage balancing, current balancing, and temperature balancing. The voltage balancing of lithium-powered battery packs is the most basic, which refers to the voltage balancing of lithium-powered battery cells in a series lithium-powered battery pack. Similarly, current balancing refers to the balancing of the current of each lithium-powered battery cell in a parallel lithium-powered battery pack. In lithium-powered battery packs, a major reason for the rapid attenuation of the performance of lithium-powered battery cells is the inconsistent current. Some cells operate at over-rate conditions, resulting in rapid attenuation of performance. The temperature difference of lithium-powered battery cells is caused by inconsistent heat generation and heat dissipation. At present, the temperature balancing of lithium-powered battery packs is generally solved by physical methods such as natural air cooling, forced air cooling, and liquid cooling.

[0004] However, passive balancing in the prior art uses resistors to dissipate energy, which generates heat and a small balancing current, thereby reducing the efficiency of the entire system. Based on the requirements of thermal management, passive balancing can only be performed one cell at a time. Lithium-powered batteries are very sensitive to heat and must be absolutely protected from external temperature rise. Passive balancing will cause local heating of the lithium-powered battery pack. In addition, high temperatures will increase the failure rate of components.

[0005] In view of the above technical defects, a solution is now proposed. Summary of the invention

[0006] The purpose of the present invention is to improve the recognition accuracy of the balancing requirement through real-time monitoring of thermal management on the basis of existing passive balancing, thereby ensuring the efficiency of the balancing system and avoiding an increase in the failure rate of components.

[0007] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a substation battery active balancing device with monitoring function, comprising a target marking unit, a region division unit, a temperature anomaly determination unit, an online monitoring unit, a balancing adjustment unit and a battery evaluation unit;

[0008] The target marking unit is used to obtain the number and distribution position of the single battery in the substation, and mark the single battery as Mn, where n is a natural number greater than 1, obtain the plane distribution data of the substation to establish the substation space model and send it to the area division unit, and mark the single battery distribution position in the substation space model one by one according to the distribution position of the single battery, and obtain the single battery distribution position;

[0009] The area division unit divides the overall monitoring area S0 according to the single battery distribution sites, takes the edge single battery distribution sites in the overall monitoring area as the starting point, and divides a number of target monitoring areas Sn according to the distribution density of the single battery distribution sites;

[0010] The temperature anomaly discrimination unit obtains multiple sets of temperature data in several target monitoring areas Sn through temperature sensors, calculates temperature discrimination coefficients based on the multiple sets of temperature data, and judges whether there is a temperature anomaly area in the overall monitoring area according to a preset temperature discrimination threshold, generates a temperature anomaly signal according to the judgment result and the position coordinates of the temperature anomaly area, and sends the temperature anomaly signal to the equilibrium condition unit;

[0011] The online monitoring unit includes a battery voltage acquisition module and an impedance acquisition module. The battery voltage acquisition module acquires the voltage value of the single battery through the battery voltage acquisition module and transmits the result to the balancing adjustment unit. The impedance acquisition module acquires the impedance value of the single battery and transmits the result to the balancing adjustment unit.

[0012] The balancing adjustment unit obtains and processes the temperature abnormality signal, analyzes the temperature abnormality signal to obtain the balancing start instruction and abnormal area information, obtains the voltage value and impedance value of the single battery in the abnormal area according to the online monitoring unit, and calculates the balancing degree, makes a judgment according to the preset balancing degree threshold, and performs balanced discharge and balanced charging on the single battery in the abnormal area that exceeds the balancing degree threshold until the balancing degree reaches the set range, and generates an evaluation notification signal at the same time;

[0013] After the battery evaluation unit obtains the evaluation notification signal, it again obtains the real-time voltage value and real-time impedance value of the single battery through the online monitoring unit, generates an evaluation judgment value, judges the balancing effect of the single battery according to the preset evaluation judgment interval, and generates a balancing qualified signal or a re-balancing signal.

[0014] Furthermore, the specific method for obtaining the distribution location of the single battery is as follows:

[0015] S101, obtaining the plane distribution data of the substation, wherein the plane distribution data specifically refers to the area size of the substation equipment distribution area, and also includes the location, structural size and environmental characteristics of the electrical equipment in the substation space;

[0016] S102, inputting the plane distribution data of the substation into the digital twin platform, which is specifically 3D Studio Max, Blender or other arbitrary modeling software, to obtain a substation spatial model, which reflects the distribution position of each electrical equipment in the substation and the spatial relationship between them;

[0017] S103, obtaining the number and distribution positions of the single storage batteries in the substation, and marking the targets in the substation space model in sequence according to the marking order of the single storage batteries, and the coordinate position of the target mark is the distribution position of the single storage battery.

[0018] Furthermore, the specific method of dividing several target monitoring areas Sn is as follows:

[0019] S201, taking any single storage battery in the substation space model as the measurement target M0, obtaining the coordinates of M0, i.e., M0 (x0, y0, z0);

[0020] S202, taking the measurement target M0 as the center and r as the radius to divide the measurement area, and obtaining the coordinates Mk (xk, yk, zk) of other single batteries in the measurement area, where k is a natural number greater than 0;

[0021] S203, calculating the distribution density value ρk of the single storage batteries in the measurement area according to the following formula:

[0022] Where i = 1, 2, 3, ..., k, the distribution density value is used to indicate the number of single storage batteries distributed in the measurement area. The larger the distribution density value, the more single storage batteries are distributed in the measurement area. On the contrary, the smaller the distribution density value, the fewer single storage batteries are distributed in the measurement area.

[0023] S204, according to the preset density judgment interval (ρmin, ρmax), if the distribution density value ρk is greater than or equal to ρmax, the measured area is a high-density area;

[0024] If the distribution density value ρk is greater than ρmin and less than ρmax, the measured area is a medium-density area;

[0025] If the distribution density value ρk is less than or equal to ρmin, the measured area is a low-density area;

[0026] S205, after removing the low-density areas, screen the repeated high-density areas to obtain the primary target monitoring area, and screen the repeated medium-density areas to obtain the secondary target monitoring area Sn.

[0027] Furthermore, the specific process of generating the temperature abnormality signal is as follows:

[0028] S301, a temperature sensor is provided on the surface and inside of each single battery, and the surface temperature T1 and the core temperature T2 of each single battery are obtained through the temperature sensor;

[0029] S302, obtain the ambient temperature T3 according to the temperature sensor set in the target monitoring area, and calculate the temperature discrimination coefficient Ht according to the following formula: Wherein, e1 and e2 are both preset proportional coefficients, and the first-level target monitoring area and the second-level target monitoring area are respectively set by the corresponding e1 and e2 values, and the temperature discrimination coefficient is used to indicate the temperature state of the battery in the target monitoring area. The larger the temperature discrimination coefficient, the more the temperature of the battery in the target monitoring area exceeds the normal operating temperature, and vice versa, the larger the temperature discrimination coefficient, the closer the temperature of the battery in the target monitoring area is to the normal operating temperature;

[0030] S303, according to the preset temperature discrimination threshold value Hmax, if the temperature discrimination coefficient is greater than the temperature discrimination threshold value, it means that the target monitoring area is a temperature abnormal area, and the position coordinates of all single batteries in the temperature abnormal area are obtained to generate a temperature abnormal signal;

[0031] If the temperature determination coefficient is less than or equal to the temperature determination threshold, it means that the temperature in the target monitoring area is normal and no signal is generated.

[0032] Furthermore, the specific process of generating the evaluation notification signal is as follows:

[0033] S401, obtaining a voltage value Ui and an impedance value Ri of a single storage battery in an abnormal area, and simultaneously obtaining an initial voltage value U0 and an initial impedance value R0 of a single storage battery in the abnormal area;

[0034] S402: Calculate the balance degree Yk of the abnormal area according to the following formula: Among them, e3, e4 and e5 are all preset proportional coefficients, and the balance degree Yk is used to reflect the balance requirement of the single battery in the abnormal area under the influence of temperature. The larger the balance degree, the greater the balance requirement of the single battery, and vice versa, the smaller the balance degree, the smaller the balance requirement of the single battery;

[0035] S403, obtaining a preset balance threshold value Ymax, and if the balance degree of the abnormal area is greater than the balance degree threshold value, generating a balance instruction and an evaluation notification signal, and sending the evaluation notification signal to the battery evaluation unit;

[0036] If the balance degree of the abnormal area is smaller than or equal to the balance degree threshold, no signal is generated.

[0037] Furthermore, the specific process of generating a balanced qualified signal or a re-balanced signal is as follows:

[0038] S501, obtain the balanced real-time voltage value Ut and real-time impedance value Rt, and calculate the evaluation judgment value fk according to the following formula: Wherein, e6 and e7 are both preset proportional coefficients, and the evaluation judgment value is used to judge the equalization effect of the equalization adjustment unit on the single battery. The closer the evaluation judgment value is to the evaluation judgment interval, the better the battery performance of the single battery after equalization adjustment. On the contrary, the farther the evaluation judgment value is from the evaluation judgment interval, the worse the battery performance of the single battery after equalization adjustment.

[0039] S502, according to the preset evaluation judgment interval (fmin, fmax), if the evaluation judgment value is greater than fmax or less than fmin, a re-balancing signal is generated and sent to the balancing adjustment unit;

[0040] If the evaluation judgment value is greater than or equal to fmin and less than or equal to fmax, an equalization qualified signal is generated.

[0041] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0042] The present invention establishes a substation space model and obtains the distribution sites of single cells, divides a number of target monitoring areas according to the distribution density of the single cell distribution sites, identifies regional temperature anomalies, and further identifies battery balancing needs after determining that there are temperature anomalies in the overall monitoring area. The single cells in the abnormal area that exceed the balancing degree threshold are subjected to balanced discharge and balanced charging until the balancing degree reaches a set range, and the balancing effect of the single cells is determined to ensure that the batteries reach a qualified working state after balancing adjustment. On the basis of existing passive balancing, the accuracy of identifying the balancing demand is improved through real-time monitoring of thermal management, which not only ensures the efficiency of the balancing system, but also avoids the increase in the failure rate of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 The overall structural diagram of the present invention is shown. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Embodiment 1:

[0046] like Figure 1 As shown, a substation battery active balancing device with monitoring function includes a target marking unit, a region division unit, a temperature anomaly determination unit, an online monitoring unit, a balancing adjustment unit and a battery evaluation unit;

[0047] The target marking unit is used to obtain the number and distribution position of the single battery in the substation, and mark the single battery as Mn, where n is a natural number greater than 1, obtain the plane distribution data of the substation to establish the substation space model and send it to the area division unit, and mark the single battery distribution position in the substation space model one by one according to the distribution position of the single battery, and obtain the single battery distribution position;

[0048] The specific method for obtaining the distribution location of single battery is as follows:

[0049] S101, obtaining the plane distribution data of the substation, wherein the plane distribution data specifically refers to the area size of the substation equipment distribution area, and also includes the location, structural size and environmental characteristics of the electrical equipment in the substation space;

[0050] S102, inputting the plane distribution data of the substation into the digital twin platform, which is specifically 3D Studio Max, Blender or other arbitrary modeling software, to obtain a substation spatial model, which reflects the distribution position of each electrical equipment in the substation and the spatial relationship between them;

[0051] S103, obtaining the number and distribution positions of the single storage batteries in the substation, and marking the targets in the substation space model in sequence according to the marking order of the single storage batteries, and the coordinate position of the target mark is the distribution position of the single storage battery.

[0052] The area division unit divides the overall monitoring area S0 according to the single battery distribution sites, takes the edge single battery distribution sites in the overall monitoring area as the starting point, and divides a number of target monitoring areas Sn according to the distribution density of the single battery distribution sites;

[0053] The specific method of dividing several target monitoring areas Sn is as follows:

[0054] S201, taking any single storage battery in the substation space model as the measurement target M0, obtaining the coordinates of M0, i.e., M0 (x0, y0, z0);

[0055] S202, taking the measurement target M0 as the center and r as the radius to divide the measurement area, and obtaining the coordinates Mk (xk, yk, zk) of other single batteries in the measurement area, where k is a natural number greater than 0;

[0056] S203, calculating the distribution density value ρk of the single storage batteries in the measurement area according to the following formula: Where i = 1, 2, 3, ..., k, the distribution density value is used to indicate the number of single storage batteries distributed in the measurement area. The larger the distribution density value, the more single storage batteries are distributed in the measurement area. On the contrary, the smaller the distribution density value, the fewer single storage batteries are distributed in the measurement area.

[0057] S204, according to the preset density judgment interval (ρmin, ρmax), if the distribution density value ρk is greater than or equal to ρmax, the measured area is a high-density area;

[0058] If the distribution density value ρk is greater than ρmin and less than ρmax, the measured area is a medium-density area;

[0059] If the distribution density value ρk is less than or equal to ρmin, the measured area is a low-density area;

[0060] S205, after removing the low-density areas, screen the repeated high-density areas to obtain the primary target monitoring area, and screen the repeated medium-density areas to obtain the secondary target monitoring area Sn.

[0061] The temperature anomaly discrimination unit obtains multiple sets of temperature data in several target monitoring areas Sn through temperature sensors, calculates temperature discrimination coefficients based on the multiple sets of temperature data, and judges whether there is a temperature anomaly area in the overall monitoring area according to a preset temperature discrimination threshold, generates a temperature anomaly signal according to the judgment result and the position coordinates of the temperature anomaly area, and sends the temperature anomaly signal to the equilibrium condition unit;

[0062] The specific process of generating temperature anomaly signals is as follows:

[0063] S301, a temperature sensor is provided on the surface and inside of each single battery, and the surface temperature T1 and the core temperature T2 of each single battery are obtained through the temperature sensor;

[0064] S302, obtain the ambient temperature T3 according to the temperature sensor set in the target monitoring area, and calculate the temperature discrimination coefficient Ht according to the following formula: Wherein, e1 and e2 are both preset proportional coefficients, and the first-level target monitoring area and the second-level target monitoring area are respectively set by the corresponding e1 and e2 values, and the temperature discrimination coefficient is used to indicate the temperature state of the battery in the target monitoring area. The larger the temperature discrimination coefficient, the more the temperature of the battery in the target monitoring area exceeds the normal operating temperature, and vice versa, the larger the temperature discrimination coefficient, the closer the temperature of the battery in the target monitoring area is to the normal operating temperature;

[0065] S303, according to the preset temperature discrimination threshold value Hmax, if the temperature discrimination coefficient is greater than the temperature discrimination threshold value, it means that the target monitoring area is a temperature abnormal area, and the position coordinates of all single batteries in the temperature abnormal area are obtained to generate a temperature abnormal signal;

[0066] If the temperature determination coefficient is less than or equal to the temperature determination threshold, it means that the temperature in the target monitoring area is normal and no signal is generated.

[0067] The online monitoring unit includes a battery voltage acquisition module and an impedance acquisition module. The battery voltage acquisition module acquires the voltage value of the single battery through the battery voltage acquisition module and transmits the result to the balancing adjustment unit. The impedance acquisition module acquires the impedance value of the single battery and transmits the result to the balancing adjustment unit.

[0068] The balancing adjustment unit obtains and processes the temperature abnormality signal, analyzes the temperature abnormality signal to obtain the balancing start instruction and abnormal area information, obtains the voltage value and impedance value of the single battery in the abnormal area according to the online monitoring unit, and calculates the balancing degree, makes a judgment according to the preset balancing degree threshold, and performs balanced discharge and balanced charging on the single battery in the abnormal area that exceeds the balancing degree threshold until the balancing degree reaches the set range, and generates an evaluation notification signal at the same time;

[0069] The specific process of generating an evaluation notification signal is as follows:

[0070] S401, obtaining a voltage value Ui and an impedance value Ri of a single storage battery in an abnormal area, and simultaneously obtaining an initial voltage value U0 and an initial impedance value R0 of a single storage battery in the abnormal area;

[0071] S402: Calculate the balance degree Yk of the abnormal area according to the following formula: Among them, e3, e4 and e5 are all preset proportional coefficients, and the balance degree Yk is used to reflect the balance requirement of the single battery in the abnormal area under the influence of temperature. The larger the balance degree, the greater the balance requirement of the single battery, and vice versa, the smaller the balance degree, the smaller the balance requirement of the single battery;

[0072] S403, obtaining a preset balance threshold value Ymax, and if the balance degree of the abnormal area is greater than the balance degree threshold value, generating a balance instruction and an evaluation notification signal, and sending the evaluation notification signal to the battery evaluation unit;

[0073] If the balance degree of the abnormal area is smaller than or equal to the balance degree threshold, no signal is generated.

[0074] After the battery evaluation unit obtains the evaluation notification signal, it again obtains the real-time voltage value and real-time impedance value of the single battery through the online monitoring unit, generates an evaluation judgment value, judges the balancing effect of the single battery according to the preset evaluation judgment interval, and generates a balancing qualified signal or a re-balancing signal.

[0075] The specific process of generating a balanced qualified signal or a re-balanced signal is as follows:

[0076] S501, obtain the balanced real-time voltage value Ut and real-time impedance value Rt, and calculate the evaluation judgment value fk according to the following formula: Wherein, e6 and e7 are both preset proportional coefficients, and the evaluation judgment value is used to judge the equalization effect of the equalization adjustment unit on the single battery. The closer the evaluation judgment value is to the evaluation judgment interval, the better the battery performance of the single battery after equalization adjustment. On the contrary, the farther the evaluation judgment value is from the evaluation judgment interval, the worse the battery performance of the single battery after equalization adjustment.

[0077] S502, according to the preset evaluation judgment interval (fmin, fmax), if the evaluation judgment value is greater than fmax or less than fmin, a re-balancing signal is generated and sent to the balancing adjustment unit;

[0078] If the evaluation judgment value is greater than or equal to fmin and less than or equal to fmax, an equalization qualified signal is generated.

[0079] The present invention establishes a substation space model and obtains the distribution sites of single cells, divides a number of target monitoring areas according to the distribution density of the single cell distribution sites, identifies regional temperature anomalies, and further identifies battery balancing needs after determining that there are temperature anomalies in the overall monitoring area. The single cells in the abnormal area that exceed the balancing degree threshold are subjected to balanced discharge and balanced charging until the balancing degree reaches a set range, and the balancing effect of the single cells is determined to ensure that the batteries reach a qualified working state after balancing adjustment. On the basis of existing passive balancing, the accuracy of identifying the balancing demand is improved through real-time monitoring of thermal management, which not only ensures the efficiency of the balancing system, but also avoids the increase in the failure rate of components.

[0080] The size of the interval and threshold is set to facilitate comparison. The size of the threshold depends on the amount of sample data and the number of bases set by technical personnel in this field for each group of sample data; as long as it does not affect the proportional relationship between the parameter and the quantized value.

[0081] The above formulas are all dimensionless and numerical calculations. The formula is a formula obtained by collecting a large amount of data and performing software simulation to obtain the most recent real situation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0082] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A substation battery active balancing device with monitoring function, characterized in that: It includes a target marking unit, a region division unit, a temperature anomaly determination unit, an online monitoring unit, a balancing adjustment unit and a battery evaluation unit; The target marking unit is used to obtain the number and distribution position of the single battery in the substation, and mark the single battery as Mn, where n is a natural number greater than 1, obtain the plane distribution data of the substation to establish the substation space model and send it to the area division unit, and mark the single battery distribution position in the substation space model one by one according to the distribution position of the single battery, and obtain the single battery distribution position; The area division unit divides the overall monitoring area S0 according to the single battery distribution sites, takes the edge single battery distribution sites in the overall monitoring area as the starting point, and divides a number of target monitoring areas Sn according to the distribution density of the single battery distribution sites; The specific method of dividing several target monitoring areas Sn is as follows: S201, taking any single storage battery in the substation space model as the measurement target M0, obtaining the coordinates of M0, i.e., M0 (x0, y0, z0); S202, taking the measurement target M0 as the center and r as the radius to divide the measurement area, and obtaining the coordinates Mk (xk, yk, zk) of other single batteries in the measurement area, where k is a natural number greater than 0; S203, calculating the distribution density value ρk of the single storage batteries in the measurement area according to the following formula: Where i = 1, 2, 3, ..., k, the distribution density value is used to indicate the number of single storage batteries distributed in the measurement area. The larger the distribution density value, the more single storage batteries are distributed in the measurement area. On the contrary, the smaller the distribution density value, the fewer single storage batteries are distributed in the measurement area. S204, according to the preset density judgment interval (ρmin, ρmax), if the distribution density value ρk is greater than or equal to ρmax, the measured area is a high-density area; If the distribution density value ρk is greater than ρmin and less than ρmax, the measured area is a medium-density area; If the distribution density value ρk is less than or equal to ρmin, the measured area is a low-density area; S205, after removing the low-density area, the repeated high-density area is screened to obtain the primary target monitoring area, and the repeated medium-density area is screened to obtain the secondary target monitoring area Sn; The temperature anomaly discrimination unit obtains multiple sets of temperature data in several target monitoring areas Sn through temperature sensors, calculates temperature discrimination coefficients based on the multiple sets of temperature data, and judges whether there is a temperature anomaly area in the overall monitoring area according to a preset temperature discrimination threshold, generates a temperature anomaly signal according to the judgment result and the position coordinates of the temperature anomaly area, and sends the temperature anomaly signal to the equilibrium condition unit; The online monitoring unit includes a battery voltage acquisition module and an impedance acquisition module. The battery voltage acquisition module acquires the voltage value of the single battery through the battery voltage acquisition module and transmits the result to the balancing adjustment unit. The impedance acquisition module acquires the impedance value of the single battery and transmits the result to the balancing adjustment unit. The balancing adjustment unit obtains and processes the temperature abnormality signal, analyzes the temperature abnormality signal to obtain the balancing start instruction and abnormal area information, obtains the voltage value and impedance value of the single battery in the abnormal area according to the online monitoring unit, and calculates the balancing degree, makes a judgment according to the preset balancing degree threshold, and performs balanced discharge and balanced charging on the single battery in the abnormal area that exceeds the balancing degree threshold until the balancing degree reaches the set range, and generates an evaluation notification signal at the same time; After the battery evaluation unit obtains the evaluation notification signal, it again obtains the real-time voltage value and real-time impedance value of the single battery through the online monitoring unit, generates an evaluation judgment value, judges the balancing effect of the single battery according to the preset evaluation judgment interval, and generates a balancing qualified signal or a re-balancing signal.

2. The substation battery active balancing device with monitoring function according to claim 1 is characterized in that: The specific method for obtaining the distribution location of single battery is as follows: S101, obtaining the plane distribution data of the substation, wherein the plane distribution data specifically refers to the area size of the substation equipment distribution area, and also includes the location, structural size and environmental characteristics of the electrical equipment in the substation space; S102, inputting the plane distribution data of the substation into the digital twin platform, the digital twin platform is specifically 3DStudio Max, Blender or other any modeling software, to obtain the substation space model, the substation space model is used to reflect the distribution position of each electrical equipment in the substation and the spatial relationship between them; S103, obtaining the number and distribution positions of the single storage batteries in the substation, and marking the targets in the substation space model in sequence according to the marking order of the single storage batteries, and the coordinate position of the target mark is the distribution position of the single storage battery.

3. The active balancing device for substation batteries with monitoring function according to claim 1, characterized in that: The specific process of generating temperature anomaly signals is as follows: S301, a temperature sensor is provided on the surface and inside of each single battery, and the surface temperature T1 and the core temperature T2 of each single battery are obtained through the temperature sensor; S302, obtain the ambient temperature T3 according to the temperature sensor set in the target monitoring area, and calculate the temperature discrimination coefficient Ht according to the following formula: Wherein, e1 and e2 are preset proportional coefficients, and the first-level target monitoring area and the second-level target monitoring area are respectively set by the corresponding e1 and e2 values, and the temperature discrimination coefficient is used to indicate the temperature state of the battery in the target monitoring area. The larger the temperature discrimination coefficient, the more the temperature of the battery in the target monitoring area exceeds the normal operating temperature, and vice versa, the larger the temperature discrimination coefficient, the closer the temperature of the battery in the target monitoring area is to the normal operating temperature; S303, according to the preset temperature discrimination threshold value Hmax, if the temperature discrimination coefficient is greater than the temperature discrimination threshold value, it means that the target monitoring area is a temperature abnormal area, and the position coordinates of all single batteries in the temperature abnormal area are obtained to generate a temperature abnormal signal; If the temperature determination coefficient is less than or equal to the temperature determination threshold, it means that the temperature in the target monitoring area is normal and no signal is generated.

4. The active balancing device for substation batteries with monitoring function according to claim 3 is characterized in that: The specific process of generating an evaluation notification signal is as follows: S401, obtaining a voltage value Ui and an impedance value Ri of a single storage battery in an abnormal area, and simultaneously obtaining an initial voltage value U0 and an initial impedance value R0 of a single storage battery in the abnormal area; S402, calculate the balance degree Yk of the abnormal area according to the following formula: Among them, e3, e4 and e5 are all preset proportional coefficients, and the balance degree Yk is used to reflect the balance requirement of the single battery in the abnormal area under the influence of temperature. The larger the balance degree, the greater the balance requirement of the single battery, and vice versa, the smaller the balance degree, the smaller the balance requirement of the single battery; S403, obtaining a preset balancing threshold value Ymax, and if the balancing degree of the abnormal area is greater than the balancing degree threshold value, generating a balancing instruction and an evaluation notification signal, and sending the evaluation notification signal to the battery evaluation unit; If the balance degree of the abnormal area is smaller than or equal to the balance degree threshold, no signal is generated.

5. The substation battery active balancing device with monitoring function according to claim 4 is characterized in that: The specific process of generating a balanced qualified signal or a re-balanced signal is as follows: S501, obtain the balanced real-time voltage value Ut and real-time impedance value Rt, and calculate the evaluation judgment value fk according to the following formula: Wherein, e6 and e7 are both preset proportional coefficients, and the evaluation judgment value is used to judge the equalization effect of the equalization adjustment unit on the single battery. The closer the evaluation judgment value is to the evaluation judgment interval, the better the battery performance of the single battery after equalization adjustment. On the contrary, the farther the evaluation judgment value is from the evaluation judgment interval, the worse the battery performance of the single battery after equalization adjustment. S502, according to the preset evaluation judgment interval (fmin, fmax), if the evaluation judgment value is greater than fmax or less than fmin, a re-balancing signal is generated and sent to the balancing adjustment unit; If the evaluation judgment value is greater than or equal to fmin and less than or equal to fmax, an equalization qualified signal is generated.

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