A switching and discharge control method for a box-type mobile power supply

Abstract

The present invention relates to the technical field of switching of marine box-type mobile power supplies, and more specifically to a method for switching and discharging control of box-type mobile power supplies, comprising: S1, assigning unique identifiers to all box-type mobile power supplies; S2, grouping the box-type mobile power supplies; S3, setting a discharge order, and switching the box-type mobile power supply with a discharge order of 1; S4, setting an initial discharge power; S5, checking the state of charge (SOC); S6, adjusting the discharge power of the box-type mobile power supply with an excessively large SOC deviation; S7, switching the box-type mobile power supply with an SOC that has reached a lower limit to the next available box-type mobile power supply; S8, checking for fault alarms, and controlling the alarms to eliminate them based on the type of fault alarm information; and adjusting the position and discharge order of unused power supplies. The present invention ensures that the discharge progress of each battery pack is consistent, and the box does not need to be reversed when switching batteries, thus avoiding the situation where an entire box-type mobile power supply is left unused for a long time.

Description

Technical Field

[0001] The present invention relates to the technical field of switching of a box-type mobile power supply for ships, and in particular to a switching and discharge control method of a box-type mobile power supply. Background Art

[0002] Pure battery-powered vessels are attracting increasing attention from shipping companies due to their zero-emissions, high efficiency, and low operating and maintenance costs. Compared to small vessels, medium- and large-sized pure battery-powered vessels have longer ranges and higher power requirements, requiring higher battery capacities. If charging is performed while berthed, the berthing time is insufficient to meet the required charging requirements. Therefore, a battery swapping model is generally adopted, whereby standard portable power banks are used on board and quickly replaced during loading and unloading at ports.

[0003] According to the voyage length and power requirements of each ship, different numbers of box-type mobile power supplies are required. They are generally deployed on the main deck and arranged in a*b*c order (a row, b column, c layer, the longitudinal direction of the ship is row, the transverse direction of the ship is column, and the vertical direction of the ship is layer). The numbering rule of the box-type mobile power supplies is "box-type mobile power supply xyz", where x represents the row, y represents the column, and z represents the layer. The arrangement is shown in the figure below. Figure 1 shown.

[0004] If a single ship is equipped with a small number of box-type mobile power supplies and all of them are connected to the DC distribution board, then all box-type mobile power supplies do not involve switching, and the discharge strategy is controlled by the ship's energy management system (EMS system). If a single ship is equipped with a large number of box-type mobile power supplies, the box-type mobile power supplies are generally grouped first and divided into N groups on average. Each group can only put one box-type mobile power supply into operation at the same time, that is, the propulsion power and daily load power supply of the entire ship are provided by N box-type mobile power supplies. When the SOC of the N box-type mobile power supplies is lower than the preset value, it will automatically switch to another N box-type mobile power supplies.

[0005] Currently, a patent provides a box-type mobile power switching method (patent number: 202211043900.5). First, all box-type mobile power supplies are grouped and the discharge order of each box-type mobile power supply in each group is assigned. The logic of the discharge order assignment is as follows:

[0006] No other box-type mobile power supply electrical equipment is involved within 3m of each box-type mobile power supply emergency exhaust vent:

[0007] In this scenario, the discharge order of each box-type mobile power supply in each group can be customized. Each box-type mobile power supply in the group is assigned a discharge order, which is identified by a number, such as 1 represents the first discharge and M represents the Mth discharge. The discharge order of each group is "1-2-...-M". Each time a switch is made, the corresponding box-type mobile power supply of each group is put into operation according to the discharge order.

[0008] There is at least one box-type mobile power supply emergency exhaust vent within 3m of some box-type mobile power supply electrical equipment:

[0009] First, set the discharge order for Group 1. The order can be customized. Based on the size of the box-type mobile power supplies and the horizontal and vertical distances between them, design the discharge order for the M box-type mobile power supplies in Group 2. Ensure that each box-type mobile power supply in Group 2 is at least 3 meters away from the emergency exhaust vents of Group 1 and follows the same discharge order. Based on the discharge order of Group 2, follow the above discharge order design principles to design the discharge order for Group 3. This continues until the discharge order for all N groups of box-type mobile power supplies is set.

[0010] The discharge order of each group is "1-2-...-M". Each time the switch is made, the corresponding box-type mobile power supply of each group is put into operation according to the discharge order.

[0011] Patent 202211043900.5 gives an example. A ship is equipped with 36 box-type mobile power supplies, each 6 box-type mobile power supplies are divided into 1 group, for a total of 6 groups. The discharge order of groups 1 to 6 is shown in the figure below. Each square represents a box-type mobile power supply, and the numbers in the squares represent the discharge order of the box-type mobile power supply. The discharge order of each group is "1-2-3-4-5-6". The ship's energy management system (hereinafter referred to as the EM step S system) controls the connection of each group of box-type mobile power supplies with the same discharge order to the DC distribution board for discharge, providing energy for the entire ship.

[0012] Currently, there is a patent that provides a box-type mobile power switching method (patent number: 202211043900.5), but this patent is applicable to the scenario where all box-type mobile power supplies are replaced after the ship arrives at the battery swap station. Generally, the battery power calculation of the entire ship takes into account the worst working conditions, such as headwind, headwind, etc. During the normal operation phase of the ship, the probability of the above-mentioned harsh working conditions is relatively low. When the ship arrives at the battery swap station, some box-type mobile power supplies are still fully charged and do not need to be replaced. If the switching method provided by the existing patent is adopted, a box inversion will occur, that is, the fully charged box-type mobile power supply is located above the box-type mobile power supply to be replaced. During the lifting operation, the fully charged box-type mobile power supply needs to be temporarily lifted to another location, and the box-type mobile power supply to be replaced below is lifted off the ship.

[0013] According to the control method proposed in patent 202211043900.5, the grouping and discharge order of box-type mobile power supplies are as follows: Figure 2 Assume that during a certain voyage, there is a mobile power bank with a discharge order of 6 that is fully charged and does not need to be replaced. In this case, groups 1, 2, 4, and 5 all need to be replaced to complete the battery replacement operation, which greatly affects the battery replacement efficiency.

[0014] At the same time, the above patent cannot guarantee that the usage time of all box-type mobile power supplies is as balanced as possible. If the sea and weather conditions on the ship are good for a period of time, only some box-type mobile power supplies are replaced each time they arrive at the battery swap station. In the switching logic provided by the existing patent, after each battery swap is completed, the discharge order needs to be reset, and the discharge starts from the box-type mobile power supply with a discharge order of 1. This will result in the box-type mobile power supplies that have not been replaced not being discharged during this period, affecting the balance of the usage time of the box-type mobile power supplies.

[0015] At the same time, in the existing control strategy, the discharge power of each group of box-type mobile power supplies is the same, and it cannot be dynamically adjusted according to the number of box-type mobile power supplies in the group and the actual SOC. This may result in one or several groups of box-type mobile power supplies having completed discharge, but some groups of box-type mobile power supplies are still discharging. In this scenario, since one or more groups of box-type mobile power supplies cannot discharge, the overall discharge power cannot meet the load requirements, which will cause the ship to slow down or prioritize the tripping of non-important loads. Summary of the Invention

[0016] In order to solve the technical problems in the prior art that the discharge progress of each group of box-type mobile power supplies is different and the position relationship is unreasonable, which may result in the need to turn over the box when changing the battery and some box-type mobile power supplies have not been used for a long time, the present invention proposes a switching and discharge control method for box-type mobile power supplies, which realizes the priority discharge of the upper box-type mobile power supply, and ensures that the discharge progress of each group of box-type mobile power supplies is basically consistent and the box is not turned over when changing the battery; when changing the battery, the position and discharge order of the box-type mobile power supplies are adjusted, and the whole box-type mobile power supplies that have not been used for a long time are given priority.

[0017] The technical solution of the present invention is:

[0018] A switching and discharge control method for a box-type mobile power supply, comprising:

[0019] Step S1, assigning a unique identifier to all box-type mobile power supplies;

[0020] Step S2, grouping the box-type mobile power supplies according to the total number of configured box-type mobile power supplies, the maximum output power of the box-type mobile power supplies, and the output power requirement;

[0021] Step S3, setting the discharge order of each box-type mobile power supply according to its position in the group, and putting the box-type mobile power supplies with a discharge order of 1 into all groups;

[0022] Step S4, proportionally setting the initial discharge power of the box-type mobile power supply according to the number of each group of box-type mobile power supplies;

[0023] Step S5, regularly checking the state of charge (SOC) of all the box-type mobile power supplies that are discharging. If there is a box-type mobile power supply whose SOC deviation exceeds the set value, execute step S6; if there is a box-type mobile power supply whose SOC reaches the lower limit, execute step S7; if there is no abnormality in the SOC, execute step S8;

[0024] Step S6, calculating a discharge power adjustment deviation amount based on the SOC deviation calculated in step S5 and a preset SOC deviation tolerance, and adjusting the discharge power of the box-type mobile power supply;

[0025] Step S7: Check whether there is an available box-type mobile power supply in the group where the box-type mobile power supply whose SOC reaches the lower limit is located. If there is an available box-type mobile power supply, switch to the next available box-type mobile power supply, and then return to step S4; if there is no available box-type mobile power supply, record the identifier of the box-type mobile power supply to set B, start the backup diesel generator set, and if the available power on the grid is still insufficient, limit the propulsion power, unload the daily load in stages, then remove the box-type mobile power supply in set B, and return to step S4;

[0026] Step S8, check the fault alarm of the box-type mobile power supply, and determine the alarm type, which is divided into a power reduction type alarm and a shutdown type alarm, and control different types of alarms separately; if it is a power reduction type alarm, adjust the discharge power of the box-type mobile power supply with the power reduction type alarm, and return to step S4; if it is a shutdown type alarm, switch the box-type mobile power supply with the shutdown type alarm, and return to step S4.

[0027] In step S2, the grouping method is specifically:

[0028] Step S21, calculating the number of groups N required to be divided according to the total number of configured box-type mobile power supplies, the maximum output power of the box-type mobile power supplies, and the required power, and the calculation formula is:

[0029]

[0030] Among them, P need is the required power, K is the total number of box-type mobile power supplies, P max The maximum output power of the box-type mobile power supply;

[0031] Step S22, based on the number of groups N calculated in step S21, calculate the basic number M of the box-type mobile power supplies in each group, and the calculation formula is:

[0032] K÷N=M……P

[0033] Step S23: Allocate M box-type mobile power supplies to each group according to the basic number M of the box-type mobile power supplies calculated in step S22, and then select P groups, allocating 1 box-type mobile power supply to each group.

[0034] In step S3, the method for setting the discharge order within the group is: the discharge order of each group of box-type mobile power supplies is numbered from top to bottom and from stern to bow.

[0035] In step S4, the calculation method of the initial discharge power of the box-type mobile power supply is:

[0036] P i =P need *X i / (X1+X2+……+X N ), i=1,2……N

[0037] Among them, P i is the initial discharge power of the box-type mobile power supply of group i, P need is the required power, X i is the number of box-type mobile power supplies contained in the i-th group of box-type mobile power supplies.

[0038] In step S5, the method for calculating the SOC deviation is:

[0039] SOC deviation = |actual SOC - theoretical SOC|

[0040] in,

[0041] Theoretical SOC = Initial SOC - P i *Discharge time

[0042] The SOC represents the state of charge of the box-type mobile power supply.

[0043] In step S6, the method for adjusting the discharge power of the box-type mobile power supply is:

[0044] Step S61, marking all the box-type mobile power supplies whose SOC deviation is greater than a preset tolerance;

[0045] Step S62: For each of the box-type mobile power supplies marked in step S61, calculate the deviation D1 between the rated discharge power and the actual discharge power of the box-type mobile power supply, as well as the deviation D2 between the rated power and the actual discharge power of the branch DC-DC. Calculate the discharge power adjustment deviation according to the preset proportional factor. The calculation formula is:

[0046] Discharge power adjustment deviation = min{D1, D2}*proportional factor;

[0047] Step S63: For a box-type mobile power supply whose actual SOC is lower than the theoretical SOC, the adjusted discharge power = actual discharge power - discharge power adjustment deviation; for a box-type mobile power supply whose actual SOC is higher than the theoretical SOC, the adjusted discharge power = actual discharge power + discharge power adjustment deviation;

[0048] Step S64 , real-time monitoring of the box-type mobile power supply whose discharge power is adjusted in step S63 , and when the SOC deviation is less than a preset tolerance, adjusting the discharge power to the initial discharge power.

[0049] In step S8, the method for controlling different types of alarms is:

[0050] Step S81: For a power reduction type alarm, based on the required power and the maximum power output of all normally operating box-type mobile power supplies, the maximum reducible power is calculated, and the discharge power of the box-type mobile power supply with the power reduction type alarm is adjusted according to the maximum reducible power; when the box-type mobile power supply with the power reduction type alarm completes discharge, step S7 is executed;

[0051] Step S82: For a shutdown type alarm, check whether there is an available box-type mobile power supply in the group of the box-type mobile power supply that has caused the shutdown type alarm. If there is an available box-type mobile power supply, switch to the next available box-type mobile power supply, and then return to step S4; if there is no available box-type mobile power supply, record the identifier of the box-type mobile power supply to set A, start the standby diesel generator set, and if the power available on the grid is still insufficient, limit the propulsion power, unload the daily load in stages, and then cut off the box-type mobile power supply in set A, and return to step S4.

[0052] In step S81, the maximum power reduction formula is:

[0053]

[0054] Among them, P is the maximum power that can be reduced, P max is the maximum output power of the box-type mobile power supply, n1 is the number of the box-type mobile power supplies with power reduction type alarm, and n2 is the number of the box-type mobile power supplies that are discharging and have no power reduction type alarm.

[0055] Based on the unique identifier assigned to the box-type mobile power supply in step S1, a database is established to record the identifiers of all the box-type mobile power supplies in the danger zone when the box-type mobile power supply corresponding to the identifier has thermal runaway.

[0056] When there is a box-type mobile power supply that has not been used for a long time, the box-type mobile power supply that has not been used for a long time is moved to the front position of the discharge order of the group when replacing the power, and is set to be discharged first.

[0057] The present invention proposes a switching and discharge control method for box-type mobile power supplies. By determining the discharge order of the box-type mobile power supplies according to their positions, it is ensured that all fully charged box-type mobile power supplies are located below the box-type mobile power supplies to be replaced, thereby avoiding box overturning during the battery replacement operation. The present invention also sets the initial discharge power and adjusts the discharge speed according to the SOC to ensure that the discharge progress of each group of mobile power supplies is consistent.

[0058] If there is a box-type mobile power supply that has not been used for a long time, the present invention will place the box-type mobile power supply that has not been used for a long time on the top layer during the battery replacement operation and set it to discharge first to ensure that the usage time of all box-type mobile power supplies is as balanced as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a schematic diagram of the arrangement of box-type mobile power supplies.

[0060] Figure 2 This is a discharge sequence diagram of the prior art.

[0061] Figure 3 The present invention is a flow chart of a switching and discharge control method of a box-type mobile power supply.

[0062] Figure 4 This is a layout diagram of a box-type mobile power supply according to an embodiment of the present invention.

[0063] Figure 5 This is a schematic diagram of grouping of a box-type mobile power supply according to an embodiment of the present invention.

[0064] Figure 6 This is a diagram showing the discharge sequence of each group of box-type mobile power supplies according to an embodiment of the present invention. DETAILED DESCRIPTION

[0065] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0066] The present invention discloses a switching and discharge control method of a box-type mobile power supply, such as Figure 3 As shown, the following steps are included:

[0067] Step S1: assign a unique identifier to all box-type mobile power supplies. Each box-type mobile power supply can be identified by its IP address or other information.

[0068] Step S2: grouping the box-type mobile power supplies according to the total number of configured box-type mobile power supplies, the maximum output power of the box-type mobile power supplies, and the output power requirement. The specific grouping method is:

[0069] Step S21, calculating the number of groups N required to be divided according to the total number of configured box-type mobile power supplies, the maximum output power of the box-type mobile power supplies, and the required power, and the calculation formula is:

[0070]

[0071] Among them, P need is the required power, K is the total number of box-type mobile power supplies, P max It is the maximum output power of the box-type mobile power supply.

[0072] Step S22, based on the number of groups N calculated in step S21, calculate the basic number M of the box-type mobile power supplies in each group, and the calculation formula is:

[0073] K÷N=M……P

[0074] Step S23: Allocate M box-type mobile power supplies to each group according to the basic number M of the box-type mobile power supplies calculated in step S22, and then select P groups, allocating 1 box-type mobile power supply to each group.

[0075] After all box-type mobile power supplies are grouped, only one box-type mobile power supply is put into each group at the same time to ensure that the maximum output power of N box-type mobile power supplies meets the power requirements of the entire ship.

[0076] In order to facilitate the crew's later management and use, all box-type mobile power supplies in each group should be arranged as centrally as possible, in a unified vertical arrangement or a unified horizontal arrangement, and try to avoid the situation where a group of box-type mobile power supplies has both horizontal and vertical arrangements.

[0077] For example, Figure 4 As shown in the figure, a ship is equipped with 10 box-type mobile power supplies, which are stacked into 6 piles. Among them, 4 piles of box-type mobile power supplies have 2 layers, and the other 2 piles have 1 layer. If it is calculated that 4 groups of box-type mobile power supplies are needed to meet the required power, that is, N = 4, then one grouping method is as follows Figure 5 As shown. There are 4 groups in total, 2 groups have 3 box-type mobile power supplies, and 2 groups have 2 box-type mobile power supplies.

[0078] Step S3: setting a discharge order according to the position of each box-type mobile power supply in the group, and putting the box-type mobile power supplies with a discharge order of 1 into all groups.

[0079] According to the direction from top to bottom and from stern to bow, each box-type mobile power supply in the group is assigned a discharge sequence, which is identified by numbers, such as 1 represents the first discharge and M represents the Mth discharge. The discharge sequence of each group is "1-2-...-M". Each time the switch is made, the corresponding box-type mobile power supply of each group is put into operation according to the discharge sequence.

[0080] exist Figure 4 、 Figure 5 In the example, the result of setting the discharge sequence according to the method of step S3 is as follows Figure 6 As shown, ensure that there is no box-type mobile power supply with a higher discharge order above any box-type mobile power supply. This ensures that the box-type mobile power supply at the top is discharged earlier in the order, avoiding box-type mobile power supply overturning during battery replacement.

[0081] Step S4, according to the number of each group of box-type mobile power supplies, the initial discharge power of the box-type mobile power supplies is proportionally set. The calculation method of the initial discharge power of the box-type mobile power supplies is:

[0082] P i =P need *X i / (X1+X2+……+X N ), i=1,2……N

[0083] Among them, P i is the initial discharge power of the box-type mobile power supply of group i, X i is the number of box-type mobile power supplies contained in the i-th group of box-type mobile power supplies.

[0084] Step S5, regularly checking the state of charge (SOC) of all the box-type mobile power supplies that are discharging. If there is a box-type mobile power supply whose SOC deviation exceeds the set value, executing step S6, adjusting the discharge power of the box-type mobile power supply whose SOC deviation exceeds the set value; if there is a box-type mobile power supply whose SOC reaches the lower limit, executing step S7, switching the box-type mobile power supply whose SOC reaches the lower limit; if there is no abnormality in the SOC, executing step S8, regularly checking the fault alarm of the box-type mobile power supply;

[0085] The method for calculating the SOC deviation is:

[0086] SOC deviation = |actual SOC - theoretical SOC|

[0087] in,

[0088] Theoretical SOC = Initial SOC - P i *Discharge time

[0089] Step S6: After the box-type power supply has been running for a period of time, due to reasons such as control accuracy, there may be a certain deviation between the actual SOC of the box-type mobile power supply and the expected value. The discharge power needs to be adjusted so that the actual SOC of the box-type mobile power supply meets the expected value and the discharge progress of each group of box-type mobile power supplies is basically consistent. The discharge power of the box-type mobile power supply is adjusted by calculating the discharge power adjustment deviation. The method for adjusting the discharge power of the box-type mobile power supply is as follows:

[0090] Step S61, marking all the box-type mobile power supplies whose SOC deviation is greater than a preset tolerance;

[0091] Step S62: For each of the box-type mobile power supplies marked in step S61, calculate the deviation D1 between the rated discharge power and the actual discharge power of the box-type mobile power supply, as well as the deviation D2 between the rated power and the actual discharge power of the branch DC-DC. Calculate the discharge power adjustment deviation according to the preset proportional factor. The calculation formula is:

[0092] Discharge power adjustment deviation = min{D1, D2}*proportional factor;

[0093] Step S63: For a box-type mobile power supply whose actual SOC is lower than the theoretical SOC, the adjusted discharge power = actual discharge power - discharge power adjustment deviation; for a box-type mobile power supply whose actual SOC is higher than the theoretical SOC, the adjusted discharge power = actual discharge power + discharge power adjustment deviation;

[0094] Step S64 , real-time monitoring of the box-type mobile power supply whose discharge power is adjusted in step S63 , and when the SOC deviation is less than a preset tolerance, adjusting the discharge power to the initial discharge power.

[0095] Step S7, check whether there is an available box-type mobile power supply in the group where the box-type mobile power supply whose SOC reaches the lower limit is located. If there is an available box-type mobile power supply, manually / automatically cut off the low SOC box-type power supply, and manually / automatically put the box-type power supply in the next discharge order of the group into use, and then return to step S4; if there is no available box-type mobile power supply, skip the low SOC box-type power supply, temporarily keep it running on the network, and record the identifier of the box-type mobile power supply to set B.

[0096] After all low SOC box-type power supplies are judged, check the length of set B. If the length of set B is 0, it means that all low SOC box-type power supplies have been replaced. If the length of set B is greater than 0, manually / automatically start the standby diesel generator set. If the available power on the grid is insufficient, limit the propulsion power and unload the daily load in stages. Then, cut off the box-type mobile power supplies in set B one by one, and return to step S4.

[0097] Step S8, regularly check the fault alarm of the box-type mobile power supply and determine the alarm type, which is divided into a power reduction type alarm and a shutdown type alarm; if it is a power reduction type alarm, execute step S81, adjust the discharge power of the box-type mobile power supply with the power reduction type alarm, and return to step S4; if it is a shutdown type alarm, execute step S82, switch the box-type mobile power supply with the shutdown type alarm, and return to step S4.

[0098] Step S81 includes: calculating the maximum power reduction based on the required power and the maximum power output of all normally operating box-type mobile power supplies, and the calculation formula is:

[0099]

[0100] Among them, P is the maximum power that can be reduced, P max is the maximum output power of the box-type mobile power supply, n1 is the number of the box-type mobile power supplies with power reduction type alarm, and n2 is the number of the box-type mobile power supplies that are discharging and have no power reduction type alarm.

[0101] The discharge power of the box-type mobile power supply with the power reduction type alarm is adjusted according to the maximum reducible power; after the box-type mobile power supply with the power reduction type alarm completes the discharge, step S7 is executed.

[0102] Step S82 includes: checking whether the group of the box-type mobile power supply that has issued a shutdown type alarm has an available box-type mobile power supply. If there is an available box-type mobile power supply, manually / automatically cutting off the alarm box-type power supply and manually / automatically switching on the box-type power supply in the next discharge order of the group, and then returning to step S4 to ensure that the overall discharge progress of each group of box-type power supplies is basically consistent; if there is no available box-type mobile power supply, skip the alarm box-type power supply, temporarily keep it running on the network, and record the identifier of the box-type mobile power supply to set A.

[0103] After all shutdown type alarm judgments are completed, check the length of set A. If the length of set A is 0, it means that all shutdown alarm box-type power supplies have been replaced; if the length of set A is greater than 0, manually / automatically start the standby diesel generator set. If the available power on the grid is insufficient, limit the propulsion power and unload the daily load in stages, then cut off the box-type mobile power supplies in the set A one by one, and return to step S4.

[0104] When there is a box-type mobile power supply that has not been used for a long time, the box-type mobile power supply that has not been used for a long time is moved to the front position of the discharge order of the group when replacing the power, and the discharge order is set to the highest priority discharge.

[0105] Considering the case of thermal runaway of a mobile power supply, it is necessary to shut down all mobile power supplies within the danger zone. Based on the actual layout of the mobile power supplies, the danger zone of each mobile power supply is calculated. Based on the unique identifier assigned to the mobile power supply in step S1, a database is established to record the identifiers of all mobile power supplies within the danger zone when thermal runaway occurs. This facilitates quick querying of the mobile power supply that needs to be shut down for a particular mobile power supply experiencing thermal runaway.

[0106] It should be noted that the specific embodiments described above can enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. Therefore, although this specification has described the present invention in detail with reference to the drawings and embodiments, those skilled in the art should understand that the present invention can still be modified or replaced with equivalents. In short, all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be included in the scope of protection of the patent for the present invention.

Claims

1. A method for switching and discharging control of a box-type mobile power supply, characterized in that: Step S1, assigning a unique identifier to all box-type mobile power supplies; Step S2, grouping the box-type mobile power supplies according to the total number of configured box-type mobile power supplies, the maximum output power of the box-type mobile power supplies, and the output power requirement; Step S3, setting the discharge order of each box-type mobile power supply according to its position in the group, and putting the box-type mobile power supplies with a discharge order of 1 into all groups; Step S4, proportionally setting the initial discharge power of the box-type mobile power supply according to the number of each group of box-type mobile power supplies; Step S5, regularly checking the state of charge (SOC) of all the box-type mobile power supplies that are discharging. If there is a box-type mobile power supply whose SOC deviation exceeds the set value, execute step S6; if there is a box-type mobile power supply whose SOC reaches the lower limit, execute step S7; if there is no abnormality in the SOC, execute step S8; Step S6, calculating a discharge power adjustment deviation amount based on the SOC deviation calculated in step S5 and a preset SOC deviation tolerance, and adjusting the discharge power of the box-type mobile power supply; Step S7: Check whether there is an available box-type mobile power supply in the group where the box-type mobile power supply whose SOC reaches the lower limit is located. If there is an available box-type mobile power supply, switch to the next available box-type mobile power supply, and then return to step S4; if there is no available box-type mobile power supply, record the identifier of the box-type mobile power supply to set B, start the backup diesel generator set, and if the available power on the grid is still insufficient, limit the propulsion power, unload the daily load in stages, then remove the box-type mobile power supply in set B, and return to step S4; Step S8, check the fault alarm of the box-type mobile power supply, and determine the alarm type, which is divided into a power reduction type alarm and a shutdown type alarm, and control different types of alarms separately; if it is a power reduction type alarm, adjust the discharge power of the box-type mobile power supply with the power reduction type alarm, and return to step S4; if it is a shutdown type alarm, switch the box-type mobile power supply with the shutdown type alarm, and return to step S4.

2. The switching and discharge control method of a box-type mobile power supply according to claim 1, characterized in that: In step S2, the grouping method is specifically: Step S21, calculating the number of groups N required to be divided according to the total number of configured box-type mobile power supplies, the maximum output power of the box-type mobile power supplies, and the required power, and the calculation formula is: Among them, P need is the required power, K is the total number of box-type mobile power supplies, P max The maximum output power of the box-type mobile power supply; Step S22, based on the number of groups N calculated in step S21, calculate the basic number M of the box-type mobile power supplies in each group, and the calculation formula is: K÷N=M……P Step S23: Allocate M box-type mobile power supplies to each group according to the basic number M of the box-type mobile power supplies calculated in step S22, and then select P groups, allocating 1 box-type mobile power supply to each group.

3. The switching and discharging control method of a box-type mobile power supply according to claim 1, characterized in that: In step S3, the method for setting the discharge order within the group is: the discharge order of each group of box-type mobile power supplies is numbered from top to bottom and from stern to bow.

4. The switching and discharging control method of a box-type mobile power supply according to claim 1, characterized in that: In step S4, the calculation method of the initial discharge power of the box-type mobile power supply is: P i =P need *X i / (X1+X2+……+X N ),i=1,2......N Among them, P i is the initial discharge power of the box-type mobile power supply of group i, P need is the required power, X i is the number of box-type mobile power supplies contained in the i-th group of box-type mobile power supplies.

5. The switching and discharging control method of a box-type mobile power supply according to claim 1, characterized in that: In step S5, the method for calculating the SOC deviation is: SOC deviation = |actual SOC - theoretical SOC| in, Theoretical SOC = Initial SOC - P i *Discharge time The SOC represents the state of charge of the box-type mobile power supply.

6. The switching and discharging control method of a box-type mobile power supply according to claim 1, characterized in that: In step S6, the method for adjusting the discharge power of the box-type mobile power supply is: Step S61, marking all the box-type mobile power supplies whose SOC deviation is greater than a preset tolerance; Step S62: For each of the box-type mobile power supplies marked in step S61, calculate the deviation D1 between the rated discharge power and the actual discharge power of the box-type mobile power supply, as well as the deviation D2 between the rated power and the actual discharge power of the branch DC-DC. Calculate the discharge power adjustment deviation according to the preset proportional factor. The calculation formula is: Discharge power adjustment deviation = min{D1, D2}*proportional factor; Step S63: For a box-type mobile power supply whose actual SOC is lower than the theoretical SOC, the adjusted discharge power = actual discharge power - discharge power adjustment deviation; for a box-type mobile power supply whose actual SOC is higher than the theoretical SOC, the adjusted discharge power = actual discharge power + discharge power adjustment deviation; Step S64 , real-time monitoring of the box-type mobile power supply whose discharge power is adjusted in step S63 , and when the SOC deviation is less than a preset tolerance, adjusting the discharge power to the initial discharge power.

7. The switching and discharge control method of a box-type mobile power supply according to claim 1, characterized in that: In step S8, the method for controlling different types of alarms is: Step S81: For a power reduction type alarm, based on the required power and the maximum power output of all normally operating box-type mobile power supplies, the maximum reducible power is calculated, and the discharge power of the box-type mobile power supply with the power reduction type alarm is adjusted according to the maximum reducible power; when the box-type mobile power supply with the power reduction type alarm completes discharge, step S7 is executed; Step S82: For a shutdown type alarm, check whether there is an available box-type mobile power supply in the group of the box-type mobile power supply that has caused the shutdown type alarm. If there is an available box-type mobile power supply, switch to the next available box-type mobile power supply, and then return to step S4; if there is no available box-type mobile power supply, record the identifier of the box-type mobile power supply to set A, start the standby diesel generator set, and if the available power in the grid is still insufficient, limit the propulsion power, unload the daily load in stages, and then cut off the box-type mobile power supply in set A, and return to step S4.

8. The switching and discharging control method of a box-type mobile power supply according to claim 7, characterized in that: In step S81, the maximum power reduction formula is: Among them, P is the maximum power that can be reduced, P max is the maximum output power of the box-type mobile power supply, n1 is the number of the box-type mobile power supplies with power reduction type alarm, and n2 is the number of the box-type mobile power supplies that are discharging and have no power reduction type alarm.

9. The switching and discharging control method of a box-type mobile power supply according to claim 1, characterized in that: Based on the unique identifier assigned to the box-type mobile power supply in step S1, a database is established to record the identifiers of all the box-type mobile power supplies in the danger zone when the box-type mobile power supply corresponding to the identifier has thermal runaway.

10. The switching and discharging control method of a box-type mobile power supply according to claim 1, characterized in that: When there is a box-type mobile power supply that has not been used for a long time, the box-type mobile power supply that has not been used for a long time is moved to the front position of the discharge order of the group when replacing the power, and is set to be discharged first.

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