Non-current-balanced UPS device, current-dividing method, and UPS parallel system

Abstract

A non-current-balanced UPS device (500), a current splitting method, and a UPS parallel system (40). The current splitting method can be applied to any UPS device (11-1, 11-2, ..., 11-N) in the UPS parallel system (40), and the current proportion of a first current output by any UPS device (11-1, 11-2, ..., 11-N) in the total output current of the UPS parallel system (40) is positively correlated with the capacity proportion of a battery group (12-1, 12-2, ..., 12-N) correspondingly connected to any UPS device (11-1, 11-2, ..., 11-N) in the total available battery capacity of the UPS parallel system (40). Thus, the system backup time of the UPS parallel system (40) can be extended, and the resource utilization rate of a battery group with a larger available battery capacity can be improved.

Description

Technical Field

[0001] The present application relates to the field of UPS technology, and in particular to a non-current-balanced UPS device, a current-dividing method, and a UPS parallel system. Background Art

[0002] An uninterruptible power system (UPS) is a system that can replace the power grid to continuously supply power to load devices and maintain the normal operation of the load devices in the event of a power grid failure (such as power outage, undervoltage, interference or surge). Specifically, the UPS system mainly includes a UPS device and a battery pack. The UPS device is connected to the power grid, the load device and the battery pack respectively. The UPS device can monitor the working status of the power grid. When the power grid is working normally, the UPS device can use the power provided by the power grid to supply power to the load devices. When the power grid fails, the UPS device can control the discharge of the battery pack and continue to supply power to the load devices using the power output of the battery pack.

[0003] Generally speaking, the output power of a single UPS device is limited. In order to drive high-power load equipment, multiple UPS devices are often required in the UPS system. The multiple UPS devices can simultaneously power the load equipment. The UPS system in this case can also be called a UPS parallel system. In a common UPS parallel system, multiple battery packs can also be provided. The multiple battery packs are connected one-to-one with the multiple UPS devices in the UPS parallel system.

[0004] However, in the above UPS parallel system, the system backup time of the UPS parallel system (the time that the battery pack continuously supplies power to the load device) is mainly determined by the battery pack with the smallest available battery capacity among the above multiple battery packs. If the available battery capacity of multiple battery packs varies greatly, it will cause resource waste for the battery pack with larger available battery capacity, and also limit the further extension of the system backup time. Therefore, the current UPS parallel system needs further research. Summary of the invention

[0005] The embodiments of the present application provide a non-current-balanced UPS device, a current-dividing method, and a UPS parallel system, which are used to extend the system backup time of the UPS parallel system and improve the resource utilization of a battery pack with a larger available battery capacity.

[0006] In the first aspect, an embodiment of the present application provides a shunt method, which can be applied to a first UPS device in a UPS parallel system. The UPS parallel system includes multiple UPS devices and multiple battery packs, and the multiple UPS devices and the multiple battery packs are correspondingly connected, and the first UPS device can be any UPS device among the multiple UPS devices. The shunt method provided in the embodiment of the present application mainly includes: the first UPS device can obtain the capacity ratio of the available battery capacity of the first battery group in the total available battery capacity of the multiple battery groups when each UPS device among the multiple UPS devices is powered by the corresponding connected battery group; the first UPS device can then control the output of the first current to the load according to the capacity ratio, wherein the current ratio of the first current in the total output current of the UPS parallel system is positively correlated with the capacity ratio.

[0007] It should be noted that at any time point when each UPS device in the plurality of UPS devices is powered by the corresponding connected battery pack, the first UPS device can execute the diversion method provided in the embodiment of the present application. The arbitrary time point can be the initial time point when each UPS device in the plurality of UPS devices starts to be powered by the corresponding connected battery pack, or it can be any time point after the initial time point when each UPS device in the plurality of UPS devices is powered by the corresponding connected battery pack.

[0008] The available battery capacity of the first battery pack can be understood as the battery capacity of the first battery pack at any time point (or near any time point) mentioned above. Similarly, the total available battery capacity of multiple battery packs can also be understood as the sum of the available battery capacities of multiple battery packs at any time point (or near any time point) mentioned above.

[0009] The current proportion of the first current in the total output current of the UPS parallel system is positively correlated with the capacity proportion. It can be understood that the greater the capacity proportion of the first battery group, the greater the current proportion of the first current output by the first UPS device in the total output current of the UPS parallel system. Conversely, the smaller the capacity proportion of the first battery group, the smaller the current proportion of the first current output by the first UPS device in the total output current of the UPS parallel system.

[0010] Therefore, by adopting the shunting method provided in the embodiment of the present application, each UPS device can be shunted according to the available battery capacity of the battery pack corresponding to the UPS device, so that the UPS device corresponding to the battery pack with a smaller available battery capacity can output a smaller output current, that is, it has a smaller output power, so the corresponding connected battery pack can also have a smaller output power, thereby extending the system backup time of the UPS parallel system. The UPS device corresponding to the battery pack with a larger available battery capacity can output a larger output current, that is, it has a larger output power, so the corresponding connected battery pack can also have a larger output power, thereby maintaining the total output current of the UPS parallel system and making full use of the resources of the battery pack with a larger available battery capacity.

[0011] Exemplarily, when the first UPS device controls the output of the first current to the load according to the capacity ratio, a first current value corresponding to the first UPS device can be calculated according to the capacity ratio and the total output current, and the first current value is equal to the product of the current value of the total output current and the capacity ratio; further, the first UPS device can control the output of the first current according to the first current value.

[0012] Specifically, when the first current value is less than the current value of the rated output current of the first UPS device, the first UPS device can control the current value of the first current to be a second current value, which is not greater than the current value of the rated output current and not less than the first current value; when the first current value is the current value of the rated output current, the first UPS device can control the current value of the first current to be the current value of the rated output current; when the first current value is greater than the current value of the rated output current of the first UPS device, the first UPS device can control the current value of the first current to be a third current value, which is not greater than the current value of the rated output current of the first UPS device.

[0013] Compared with the current-sharing solution, the above solution can also extend the system backup time of the UPS parallel system and improve the resource utilization of the battery pack with a larger available battery capacity. At the same time, it can also ensure that the first current output by the first UPS device does not exceed the rated output current of the first UPS device, which is conducive to ensuring the safety of the first UPS device.

[0014] In view of this, in order to maintain the total output current of the UPS parallel system, when the first current value is greater than the current value of the rated output current of the first UPS device, the first UPS device may also send an indication message to the second UPS device, and the indication message may indicate the difference between the first current value and the third current value. The second UPS device may be any UPS device in the UPS parallel system except the first UPS device.

[0015] After receiving the indication information, the second UPS device can determine the second current value of the second UPS device according to the sum of the indication information and the first current value of the second UPS device. The second UPS device can then control the current value of the first current of the second device to be the second current value. Therefore, the implementation method can ensure the safety of the first UPS device while keeping the total output current of the UPS parallel system unchanged.

[0016] In order to maintain the total output current of the UPS parallel system, when the first current value is less than the current value of the rated output current of the first UPS device, the first UPS device can also control the current value of the first current of the first UPS device to be a second current value according to the received indication information after receiving the indication information sent by any other UPS device, wherein the second current value is the sum of the difference between the first current value and the indication of the indication information.

[0017] It can be understood that the first UPS device can also increase the current value of the first current according to the indication information sent by any other UPS device, that is, control the current value of the first current to be a second current value, and the second current value can be the sum of the first current value of the first UPS device and the difference indicated by the indication information. Thus, the total output current of the UPS parallel system can be kept unchanged while ensuring the safety of any other UPS device.

[0018] In the embodiment of the present application, when obtaining the capacity share of the first battery group, the first UPS device can send a first query message to other UPS devices among the multiple UPS devices except the first UPS device, and the first query message can instruct the other UPS devices to feedback the available battery capacity of the corresponding connected battery group; the first UPS device can then obtain the capacity share based on the available battery capacity of the first battery group and the available battery capacity of the corresponding connected battery groups of other UPS devices.

[0019] It is understandable that the first UPS device may also receive the first query information sent by other UPS devices. Exemplarily, after receiving the first query information sent by any other UPS device except the first UPS device, the first UPS device may also feedback the available battery capacity of the first battery group to any other UPS device that sent the first query information.

[0020] In one possible implementation, after the first UPS device starts to use the first battery pack for power supply, it can also send a second query message to other UPS devices except the first UPS device, and the second query message can instruct the other UPS devices to feedback the current power supply status; when the other UPS devices are all powered by the battery pack, the first UPS device can determine that each of the multiple UPS devices is powered by the corresponding connected battery pack.

[0021] Specifically, each UPS device in the UPS parallel system can switch to the battery pack for power supply when the power grid fails. However, due to the various factors that cause the power grid failure, in some scenarios, multiple UPS devices in the UPS parallel system will not switch to the battery pack for power supply synchronously. In view of this, after the first UPS device starts to use the battery pack for power supply, it is also necessary to first determine whether the current time point is the initial time point. When the current time point is the current time point, the first UPS device then obtains the capacity percentage of the first battery pack. Using the above method provided in the embodiment of the present application, the first UPS device can determine whether the current time point is the initial time point by sending a second query message to other UPS devices respectively.

[0022] In addition, when there is at least one other UPS device that does not use the corresponding connected battery pack for power supply, the first UPS device can also control the output of a second current to the load, and the second current is not greater than the rated output current of the first UPS device. Specifically, when there is at least one other UPS device that does not use the corresponding connected battery pack for power supply, it means that the current time point is not the initial time point. In this case, the first UPS device can output the second current. The current value of the second current can be equal to the current value of the output current of the first UPS device when it uses the power grid for power supply, and the current value of the second current can also be less than the current value of the output current of the first UPS device when it uses the power grid for power supply, so as to extend the backup time of the first UPS device.

[0023] It is understandable that the first UPS device may also receive the second query information sent by other UPS devices. Exemplarily, after receiving the second query information sent by any other UPS device except the first UPS device, the first UPS device may also feedback the current power supply status to any other UPS device that sent the second query information.

[0024] In the second aspect, the embodiment of the present application also provides a non-current-balanced UPS device, which can be applied to a UPS parallel system, and the UPS parallel system includes multiple UPS devices, and the non-current-balanced UPS device can be used as any UPS device in the UPS parallel system. In the UPS parallel system, the non-current-balanced UPS device is correspondingly connected to the first battery pack, and can implement the current diversion method provided in any one of the first aspects. The technical effects of the corresponding scheme in the second aspect can refer to the technical effects that can be obtained by the corresponding scheme in the first aspect, and the repeated parts are not described in detail. Exemplarily, the control module can obtain the capacity ratio of the available battery capacity of the first battery group in the total available battery capacity of the multiple battery groups when each UPS device in the multiple UPS devices is powered by the corresponding connected battery group; the control module can then control the power module to output the first current to the load according to the capacity ratio, wherein the current ratio of the first current in the total output current of the UPS parallel system is positively correlated with the capacity ratio.

[0025] Exemplarily, when the control module controls the power module to output the first current to the load according to the capacity ratio, the control module can calculate the first current value corresponding to the non-current-balanced UPS device according to the capacity ratio and the total output current, and the first current value is equal to the product of the current value of the total output current and the capacity ratio; further, the control module can control the power module to output the first current according to the first current value.

[0026] Specifically, when the first current value is less than the current value of the rated output current of the non-current balancing UPS device, the control module can control the current value of the first current to be a second current value, which is not greater than the current value of the rated output current and not less than the first current value; when the first current value is the current value of the rated output current, the control module can control the current value of the first current to be the current value of the rated output current; when the first current value is greater than the current value of the rated output current of the non-current balancing UPS device, the control module can control the current value of the first current to be a third current value, which is not greater than the current value of the rated output current of the non-current balancing UPS device.

[0027] In order to maintain the total output current of the UPS parallel system, when the first current value is greater than the current value of the rated output current of the non-current-balanced UPS device, the control module can also control the communication module to send an indication message to the second UPS device, and the indication message indicates the difference between the first current value and the third current value. The second UPS device can be any UPS device among the multiple UPS devices in the UPS parallel system except the non-current-balanced UPS device.

[0028] In order to maintain the total output current of the UPS parallel system, when the first current value is less than the current value of the rated output current of the non-current-balanced UPS device, the control module can also control the current value of the first current of the non-current-balanced UPS device to a second current value according to the received indication information after the communication module receives the indication information sent by any other UPS device, wherein the second current value is the sum of the difference between the first current value and the indication of the indication information.

[0029] In an embodiment of the present application, when obtaining the capacity percentage of the first battery group, the control module can control the communication module to send a first query message to other UPS devices among the multiple UPS devices except the non-current-balanced UPS device, and the first query message is used to instruct the other UPS devices to feedback the available battery capacity of the corresponding connected battery group; the control module can then obtain the capacity percentage based on the available battery capacity of the first battery group and the available battery capacity of the corresponding connected battery groups of other UPS devices.

[0030] It can be understood that the control module can also control the communication module to feed back the available battery capacity of the first battery group to any other UPS device after the communication module receives the first query information sent by any other UPS device except the non-current-balanced UPS device.

[0031] In one possible implementation, after starting to use the first battery pack for power supply, the control module can also control the communication module to send a second query message to other UPS devices except the non-current-balanced UPS device, and the second query message can instruct the other UPS devices to feedback the current power supply status; when the other UPS devices are all powered by the battery pack, the control module can determine that each of the multiple UPS devices is powered by the corresponding connected battery pack.

[0032] In addition, when there is at least one other UPS device that is not powered by a correspondingly connected battery pack, the control module may also control the power module to output a second current to the load, and the second current is not greater than the rated output current of the non-current-balanced UPS device.

[0033] It can be understood that the control module can also control the communication module to feed back the current power supply status to any other UPS device after the communication module receives the second query information sent by any other UPS device except the non-current-balanced UPS device.

[0034] In a third aspect, an embodiment of the present application further provides a UPS parallel system, the UPS parallel system comprising a plurality of non-current-balanced UPS devices and a plurality of battery packs as provided in any one of the second aspects, and the plurality of non-current-balanced UPS devices and the plurality of battery packs are connected correspondingly. Each battery pack is used to supply power to the correspondingly connected non-current-balanced UPS device.

[0035] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores instructions, which, when executed on a computer, enable the computer to execute the methods described in the above aspects.

[0036] In a fifth aspect, an embodiment of the present application further provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the methods described in the above aspects.

[0037] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of a UPS system architecture;

[0039] Figure 2 This is a schematic diagram of a UPS parallel system architecture;

[0040] Figure 3 A schematic diagram of a flow chart of a diversion method provided in an embodiment of the present application;

[0041] Figure 4a This is a schematic diagram of system power backup time under a current balancing solution;

[0042] Figure 4b A schematic diagram of system backup time after adopting the diversion method provided in an embodiment of the present application;

[0043] Figure 5 A schematic diagram of the structure of a non-current-balanced UPS device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The specific operation method in the method embodiment can also be applied to the device embodiment or the system embodiment. It should be noted that in the description of the present application, "at least one" refers to one or more, wherein multiple refers to two or more. In view of this, "multiple" can also be understood as "at least two" in the embodiment of the present invention. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects before and after are in an "or" relationship. In addition, it should be understood that in the description of the present application, words such as "first" and "second" are only used to distinguish the purpose of description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In the embodiment of the present application, the relative magnitude relationship between the currents is equivalent to the relative magnitude relationship between the current values. If current 1 is greater than current 2, it can also be expressed as the current value of current 1 being greater than the current value of current 2.

[0045] In modern society, there are a large number of devices that rely on electricity to operate, ranging from household appliances to data centers and factory production lines. Power supply has become one of the factors to maintain the normal operation of modern society. Therefore, the country has built a large-scale power grid, and the electricity generated by power plants can be transmitted through the power grid to the devices that need electricity to operate.

[0046] However, there is a risk of power outages in the power grid. When the power grid is cut off, it may damage the equipment and affect people's experience. For example, when a data center suddenly loses power, important data may be lost. When the lights suddenly lose power, it will affect people's nighttime lighting and bring inconvenience to people's lives.

[0047] In view of this, UPS systems have been increasingly widely used. Figure 1 A schematic diagram of a UPS system architecture is shown as an example. Figure 1 As shown, the UPS system 10 mainly includes a UPS device 11 and a battery group 12. The UPS device 11 is connected to a power grid 20, a load 30 and the battery group 12 respectively.

[0048] The power grid 20 may be a city power grid, a photovoltaic power grid, a microgrid, a household power grid, an industrial power grid, etc. The power grid 20 may continuously supply power to the UPS device 11. There are many possibilities for the power provided by the power grid 20 to the UPS device 11, for example, it may be AC ​​power or DC power, it may be high-frequency AC power or low-frequency AC power, it may be high-voltage power or low-voltage power. The power provided by the power grid 20 to the UPS device 11 is mainly determined by the type of the power grid 20, and the embodiments of the present application do not impose many restrictions on this.

[0049] When the power grid 20 maintains power supply, the UPS device 11 can use the power provided by the power grid 20 to power the load 30. Specifically, in a possible implementation, the power grid 20 can directly forward the power provided by the power grid 20 to the load 30. For example, the power grid 20 inputs 220V, 50HZ AC power to the UPS device 11, and the UPS device 11 also outputs 220V, 50HZ AC power to the load 30.

[0050] In another possible implementation, the UPS device 11 may also transform the electric energy provided by the power grid 20, such as one or more of the transformation modes such as rectification transformation, inversion transformation, step-up transformation, and step-down transformation, so as to output electric energy adapted to the load 30. For example, the power grid 20 inputs AC power to the UPS device 11, and the load 30 is a DC load, then the UPS device 11 may rectify the AC power provided by the power grid 20, and after converting the AC power into DC power, provide it to the load 30. If the voltage of the DC power obtained by rectification transformation is relatively high, and the load 30 is a low-voltage DC load, then the UPS device 11 may also step-down the DC power, obtain low-voltage DC power, and then provide it to the load 30.

[0051] The load 30 is operated by the power provided by the UPS device 11. It should be understood that, depending on the application scenario, the load 30 may also be implemented in different ways. Exemplarily, the load 30 may be a household appliance, such as a refrigerator, a washing machine, an air conditioner, a light, etc. In this case, the power grid 20 may be a household power grid, and the UPS system 10 may provide uninterrupted power to the household appliances.

[0052] For another example, the load 30 may be a residential area, in which case the power grid 20 may be a city power grid, and the UPS system 10 may provide uninterrupted power to all residents in the residential area. For another example, the load 30 may be a data center, in which case the power grid 20 may be an industrial power grid, and the UPS system 10 may provide uninterrupted power to the data center. There are many possible application scenarios for the UPS system 10, which will not be listed one by one.

[0053] While the power grid 20 maintains power supply, the UPS device 11 can continuously monitor the power supply status of the power grid 20. When the power grid 20 fails, the UPS device 11 can continue to supply power to the load 30 using the power provided by the battery pack 12. It should be noted that "power supply failure of the power grid 20" should be understood as a situation where the UPS device 11 cannot receive normal power from the power grid 20. For example, the UPS device 11 cannot receive power from the power grid 20, or the power provided by the power grid 20 has a voltage sag (the voltage input by the power grid 20 is 15%-20% lower than the nominal voltage and lasts for several seconds), or the power provided by the power grid 20 has a surge (the voltage input by the power grid 20 is more than 10% higher than the nominal voltage and lasts for several seconds), or there is serious interference in the power provided by the power grid 20, etc. These abnormal situations can all be understood as "power supply failure of the power grid 20".

[0054] When the UPS device 11 uses the power provided by the battery pack 12 to continue to supply power to the load 30, it can directly forward the power provided by the battery pack 12 to the load 30, or convert the power provided by the battery pack 12, such as one or more of the conversion modes such as inverter conversion, boost conversion, and buck conversion, so as to output power adapted to the load 30. For example, if the load 30 is an AC load, the UPS device 11 can invert the DC power provided by the battery pack 12 to obtain AC power, and provide it to the load 30.

[0055] like Figure 1 As shown, the battery pack 12 may include a plurality of batteries. The battery pack 12 supplies power to the UPS device 11, which may be understood as the plurality of batteries outputting electrical energy in parallel to the UPS device 11. Generally speaking, the batteries in the battery pack 12 may be storage batteries. While the power grid 20 maintains power supply, the UPS device 11 may charge the battery pack 12 using the electrical energy provided by the power grid 20. When the power grid 20 fails, the battery pack 12 may release the stored electrical energy to the UPS device 11, so that the UPS device 11 may maintain uninterrupted power supply to the load 30.

[0056] The UPS device 11 can also continuously monitor the power supply status of the power grid 20 while using the battery pack 12 to supply power. After the power grid 20 resumes supplying power, the UPS device 11 can switch to supplying power to the power grid 20 and continue to supply power to the load 30 using the power provided by the power grid 20. In addition, the power provided by the power grid 20 can also be used to charge the battery pack 12.

[0057] From the above content, it can be seen that the UPS device 11 can maintain uninterrupted power supply to the load 30 when the power supply status of the power grid 20 changes. However, as the application scenarios of the UPS system 10 become more and more complex, the working power of the load 30 is gradually increased. For example, when the load 30 is a high-power load such as an industrial park or a large data center, the output power of only one UPS device is often unable to drive the load 30 to operate. In view of this, more and more high-power loads 30 are adapted to the UPS parallel system.

[0058] For example, Figure 2 As shown, the UPS parallel system 40 is a UPS system capable of driving a high-power load 30. The UPS parallel system 20 includes a plurality of UPS devices (UPS device 11-1, UPS device 11-2, ..., UPS device 11-N, N is an integer greater than 1), and a plurality of battery packs (battery pack 12-1, battery pack 12-2, ..., battery pack 12-N). The plurality of UPS devices and the plurality of battery packs in the UPS parallel system 20 are respectively connected correspondingly, such as the UPS device 11-1 is connected to the battery pack 12-1, the UPS device 11-2 is connected to the battery pack 12-2, ..., the UPS device 11-N is connected to the battery pack 12-N.

[0059] The multiple UPS devices in the UPS parallel system 40 are also connected to the power grid 20 and the load 30. When the power grid 20 maintains power supply, the multiple UPS devices can use the power provided by the power grid 20 to jointly power the load 30, thereby increasing the output power of the UPS parallel system 40 as a whole, and then driving the load 30 to operate.

[0060] When the power supply of the power grid 20 fails, the multiple UPS devices can use the power provided by the corresponding battery packs to continue to supply power to the load 30. The time that each UPS device can continue to use the battery pack to supply power can be called the backup time of the UPS device. For example, when the battery pack is started to supply power, the available battery capacity of the battery pack 12-1 is 12A·h, and the battery current is 2A, then the backup time of the UPS device 11-1 is 6h.

[0061] It can be understood that since multiple UPS devices are required to simultaneously supply power to the load 30 in the UPS parallel system 40 to drive the load 30 to operate, when multiple UPS devices are powered by battery packs at the same time, the system backup time of the UPS parallel system 40 is mainly limited by the UPS device with the shortest backup time.

[0062] In the current UPS parallel system 40, current balancing is mostly used to divide the current of each UPS device. Even if the load 30 is evenly distributed among the multiple UPS devices in the UPS parallel system 40, it can be understood that the multiple UPS devices can output the same output current. Among them, the output current of each UPS device is obtained by the UPS device converting the battery current of the corresponding connected battery pack. Usually, when multiple UPS devices output the same output current, the multiple battery packs in the UPS parallel system 40 can also have the same battery current, and the output power of the multiple battery packs is the same. Therefore, when multiple UPS devices are powered by battery packs, the system backup time of the UPS parallel system 40 is mainly determined by the battery pack with the smallest available battery capacity.

[0063] For example Figure 2 In the example, the battery currents of UPS devices 11-1 to UPS devices 11-N are all 2A. At the initial time point of the power failure of the power grid 20, UPS devices 11-1 to UPS devices 11-N all switch to using the battery pack for power supply. At this time, the available battery capacity of the battery pack 12-2 is the smallest, only 10A·h, and the overall system backup time of the UPS parallel system 40 is 5h. That is to say, after 5h, the UPS parallel system 40 will no longer be able to provide enough power for the load 30 to drive its operation.

[0064] It should be pointed out that the "available battery capacity" in the embodiments of the present application refers to the battery capacity that can be used in the battery pack. Specifically, during the discharge of the battery pack, the actual battery capacity of the battery pack will gradually decrease. Some battery packs are provided with a cut-off capacity, that is, when the actual battery capacity of the battery pack is reduced to the cut-off capacity, the battery pack can no longer output electrical energy. In this case, the "available battery capacity" in the embodiments of the present application can be understood as the difference between the actual battery capacity of the battery pack and the cut-off capacity.

[0065] In the current UPS parallel system 40, due to the current-equalizing current-dividing method, the battery pack with a larger available battery capacity is wasted, and the further improvement of the system backup time of the UPS parallel system 40 is limited. For example, in the above example, the available battery capacity of the battery pack 12-1 at the initial time point is 12A·h, and the available battery capacity of the battery pack 12-2 at the initial time point is 10A·h. When the system backup time of the UPS parallel system 40 is reached, the available battery capacity of the battery pack 12-1 still remains 2A·h.

[0066] In view of this, an embodiment of the present application provides a new current diversion method, which diverts current to each UPS device according to the available battery capacity of each battery pack. Compared with the current equalization diversion method, the battery current of some UPS devices can be reduced (the available battery capacity of the battery pack corresponding to these UPS devices at the initial time point is smaller), so as to extend the backup time of these UPS devices, thereby extending the system backup time of the UPS parallel system 40.

[0067] At the same time, the battery current size of another part of the UPS device can also be increased (the battery group corresponding to the other part of the UPS device has a larger available battery capacity at the initial time point) to maintain the output power of the UPS parallel system 40 and make full use of the resources of the battery group corresponding to the other part of the UPS device.

[0068] Exemplarily, the current shunting method provided in the embodiment of the present application can be applied to any UPS device in the UPS parallel system 40. Next, the current shunting method provided in the embodiment of the present application is further illustrated by taking the UPS device 11-1 as an example. It should be understood that the current shunting method can also be applied to other UPS devices in the UPS parallel system 40 except the UPS device 11-1, and the embodiment of the present application will not be described in detail.

[0069] like Figure 3 As shown, the flow separation method provided in the embodiment of the present application mainly includes the following steps:

[0070] S301: When each UPS device in a plurality of UPS devices is powered by a corresponding connected battery pack, the UPS device 11-1 may obtain a capacity ratio of the available battery capacity of the battery pack 12-1 to the total available battery capacity of the plurality of battery packs.

[0071] Among them, UPS device 11-1 can execute S301 at any time point when each UPS device among the multiple UPS devices is powered by the corresponding connected battery pack. For example, S301 can be executed at the initial time point when each UPS device among the multiple UPS devices starts to be powered by the corresponding connected battery pack, or S301 can be executed at any time point after the initial time point during the period when each UPS device among the multiple UPS devices is powered by the corresponding connected battery pack.

[0072] For example, during the period from time point t1 to time point t2, the UPS devices 11-1 to 11-N in the UPS parallel system 40 are all powered by the battery pack, and the time point at which the UPS device 11-1 executes S301 in the embodiment of the present application can be time point t1, time point t2, or any time point between time point t1 and time point t2. Among them, time point t1 can be understood as the above-mentioned initial time point.

[0073] For ease of understanding, the present embodiment uses the first time point to represent the time point at which the UPS device 11-1 executes S301. It can be understood that there may be one or more first time points during the period from t1 to t2, that is, the UPS device 11-1 may execute S301 once or multiple times. Figure 3 The diversion method shown is not limited in the embodiments of the present application.

[0074] In the embodiment of the present application, the available battery capacity of the battery pack 12-1 can be understood as the battery capacity of the battery pack 12-1 at the first time point (or near the first time point). Similarly, the total available battery capacity of multiple battery packs can also be understood as the sum of the available battery capacities of the battery packs 12-1 to 12-N at the first time point (or near the first time point).

[0075] For example, assuming that the UPS parallel system 40 includes UPS device 11-1, UPS device 11-2 and UPS device 11-3, at time point t1, the available battery capacity of battery group 12-1 is 10A.h, the available battery capacity of battery group 12-2 is 20A.h, and the available battery capacity of battery group 12-3 is 30A.h, then it can be obtained that the available battery capacity of battery group 12-1 accounts for 1 / 6 of the total available battery capacity.

[0076] In a possible implementation, the UPS device 11-1 may send first query information to the UPS devices 11-2 to 11-N respectively, and the first query information may instruct the UPS devices receiving the first query information to feedback the available battery capacity of the corresponding connected battery pack.

[0077] Specifically, after receiving the first query information sent by the UPS device 11-1, the UPS device 11-2 can feedback the available battery capacity of the battery group 12-2 to the UPS device 11-1. After receiving the first query information sent by the UPS device 11-1, the UPS device 11-N can feedback the available battery capacity of the battery group 12-N to the UPS device 11-1.

[0078] UPS device 11-N can then obtain the total available battery capacity of N battery groups based on the available battery capacity of battery group 12-1 and the available battery capacities of battery groups 12-2 to 12-N respectively fed back by UPS devices 11-2 to UPS devices 11-N, and then obtain the capacity share of battery group 12-1.

[0079] It is understandable that the UPS device 11-1 may also receive the first query information sent by other UPS devices. After receiving the first query information sent by other UPS devices, the UPS device 11-1 may feedback the available battery capacity of the battery group 12-1 to the UPS device that sent the first query information.

[0080] In another possible implementation, each UPS device may also periodically broadcast the available battery capacity of the corresponding connected battery pack, and UPS device 11-1 may obtain the capacity share of battery pack 12-1 based on the available battery capacities of battery packs 12-2 to 12-N broadcasted by UPS devices 11-2 to 11-N respectively.

[0081] S302: The UPS device 11-1 outputs a first current to the load according to the capacity ratio, wherein the current ratio of the first current in the total output current of the UPS parallel system 40 is positively correlated with the capacity ratio.

[0082] Specifically, the larger the capacity ratio of the battery pack 12-1, the larger the current ratio of the first current output by the UPS device 11-1 in the total output current of the UPS parallel system 40. Conversely, the smaller the capacity ratio of the battery pack 12-1, the smaller the current ratio of the first current output by the UPS device 11-1 in the total output current of the UPS parallel system 40. The same is true for UPS devices 11-2 to UPS devices 11-N, which will not be repeated.

[0083] Therefore, by adopting the shunting method provided in the embodiment of the present application, each UPS device can be shunted according to the available battery capacity of the battery pack corresponding to the UPS device, so that the UPS device corresponding to the battery pack with a smaller available battery capacity can output a smaller output current, that is, it has a smaller output power, so the corresponding connected battery pack can also have a smaller output power, thereby extending the system backup time of the UPS parallel system. The UPS device corresponding to the battery pack with a larger available battery capacity can output a larger output current, that is, it has a larger output power, so the corresponding connected battery pack can also have a larger output power, thereby maintaining the total output current of the UPS parallel system and making full use of the resources of the battery pack with a larger available battery capacity.

[0084] Next, the splitting method provided in the embodiment of the present application is further illustrated by the following examples:

[0085] Example 1

[0086] The current proportion of the first current in the total output current of the UPS parallel system 40 is equal to the capacity proportion of the available battery capacity of the battery pack 12-1 in the total available battery capacity of the plurality of battery packs. For example, if the capacity proportion of the battery pack 12-1 is 2 / 5, then the first current output by the UPS device 11-1 also accounts for 2 / 5 of the total output current of the UPS parallel system.

[0087] The use of the embodiments of the present application is beneficial to prolonging the system backup time and improving the resource utilization of battery packs with larger available battery capacity.

[0088] Assume that the UPS parallel system 40 includes two UPS devices: a UPS device 11-1 and a UPS device 11-2, and a battery pack 12-1 connected to the UPS device 11-1, and a battery pack 12-2 connected to the UPS device 11-2. The capacity of the battery pack 12-1 accounts for 2 / 5, and the capacity of the battery pack 12-2 accounts for 3 / 5, that is, the ratio of the available battery capacity between the battery pack 12-1 and the battery pack 12-2 is 2:3.

[0089] like Figure 4a As shown, when the current-sharing mode is adopted, the output power of the UPS device 11-1 and the UPS device 11-2 is the same, assuming that both are P / 2, where P is the total output power. Among them, the backup time of the UPS device 11-2 is T, that is, the length of time that the UPS device 11-2 can continuously discharge is T, and the backup time of the UPS device 11-1 is 2 / 3*T, that is, the length of time that the UPS device 11-1 can continuously discharge is 2 / 3*T. Therefore, the system backup time of the UPS parallel system 40 is 2 / 3*T.

[0090] After adopting the current splitting method provided in the embodiment of the present application, the first current output by the UPS device 11-1 is 2 / 5*I, and the first current output by the UPS device 11-2 is 3 / 5*I. That is, the output power of the UPS device 11-1 is 2 / 5*P, and the first current output by the UPS device 11-2 is 3 / 5*P. In this case, Figure 4b As shown, the backup time of the UPS device 11-1 can be extended to 5 / 6*T. Meanwhile, the backup time of the UPS device 11-2 can be shortened to 5 / 6*T. Therefore, the system backup time of the UPS parallel system 40 can be extended to 5 / 6*T.

[0091] Compared with the current sharing method ( Figure 4aAs shown in FIG. 1 , the embodiment of the present application can increase the backup time of the UPS parallel system 40 by 25%. Moreover, when the system backup time is reached, the available battery capacity of the battery pack 12-1 and the battery pack 12-2 can be fully consumed, so that the resources of the battery pack can be fully utilized.

[0092] Example 2

[0093] In order to protect the safety of the UPS 11-1 device, the first current output by the UPS device 11-1 should be prevented from exceeding the rated output current of the UPS device 11-1. In view of this, in a possible implementation, the UPS device 11-1 can also first determine the first current value of the UPS device 11-1 according to the capacity ratio of the battery group 12-1, and then output the first current according to the first current value. The first current value is equal to the product of the current value of the total output current and the above-mentioned capacity ratio.

[0094] Specifically, there are mainly three possible situations for the relative magnitude relationship between the first current value and the current value of the rated output current of the UPS device 11-1:

[0095] Case 1: The first current value is equal to the current value of the rated output current.

[0096] In this case, the UPS device 11 - 1 may use the first current value (that is, the current value of the rated output current) as the current value of the first current.

[0097] Case 2: The first current value is greater than the current value of the rated output current.

[0098] In this case, the UPS device 11-1 may use the third current value as the current value of the first current, and the current value of the third current is not greater than the current value of the rated output current of the UPS device 11-1. For example, if the first current value is 3A and the current value of the rated output current is 2A, the UPS device 11-1 may use the third current value as the current value of the first current, and the third current value may be 2A or any current value less than 2A.

[0099] In a possible implementation, the UPS device 11-1 may also send indication information to any UPS device other than the UPS device 11-1, and the indication information may indicate the difference between the first current value and the third current value. As in the above example, assuming that the third current value is 2A, the indication information may indicate the difference between the first current value and the third current value, that is, 1A.

[0100] The UPS device that receives the indication information can increase the current value of its own first current according to the indication information to keep the current value of the total output current unchanged. Exemplary, as shown in Table 1 below. Assume that the UPS parallel system 40 includes two UPS devices: UPS device 11-1 and UPS device 11-2, and the current value of the total output current is 45A. Among them, the ratio of the available battery capacity between the battery group 12-1 and the battery group 12-2 is 3:2, that is, the capacity of the battery group 12-1 accounts for 3 / 5, and the capacity of the battery group 12-2 accounts for 2 / 5.

[0101] Then, UPS device 11-1 can determine the first current value to be 27 A, and UPS device 11-2 can determine the first current value to be 18 A. Assuming that the current values ​​of the rated output currents of UPS device 11-1 and UPS device 11-2 are both 25 A, UPS device 11-1 can determine the third current value to be 25 A, that is, the current value of the first current is 25 A.

[0102] Moreover, the UPS device 11-1 may also send an indication message to the UPS device 11-2, and the indication message may be the difference 2A of the first current value minus the third current value in the UPS device 11-1. The UPS device 11-2 may then determine that the second current value is the current value of the first current of the UPS device 11-2 based on the sum of the indication message and the first current value of the UPS device 11-2. As in the above example, the UPS device 11-2 may determine that the second current value is 18+2=20A, that is, the UPS device 11-2 outputs the first current value of 20A.

[0103] Compared with the current-balanced current-dividing solution, the example 2 provided in the embodiment of the present application can also extend the system backup time of the UPS parallel system 40. Specifically, when the current value of the total output current is 45A, if the current-balanced current-dividing solution is adopted, the output current of the UPS device 11-1 and the UPS device 11-2 are both 22.5A.

[0104] After adopting the technical solution provided in the embodiment of the present application, the UPS device 11-1 can output a first current of 25 A, and the UPS device 11-2 can output a first current of 20 A. Compared with the current-sharing solution of current balancing, this example 2 increases the output current of the UPS device 11-1 and reduces the output current of the UPS device 11-2, thereby increasing the battery current of the battery group 12-1 and reducing the battery current of the battery group 12-2.

[0105] Since the battery capacity of the battery pack 11-2 is relatively small, reducing the battery current of the battery pack 12-2 is beneficial to extending the system backup time of the UPS parallel system 40. Moreover, increasing the battery current of the battery pack 12-1 can also reduce the remaining available battery capacity in the battery pack 12-1 after the system backup time is reached, which is beneficial to improving the resource utilization of the battery pack 11-2. In summary, the use of the diversion solution provided in Example 2 of the present application can not only extend the system backup time and improve the resource utilization of the battery pack with a larger available battery capacity, but also protect the safety of the UPS device.

[0106] Case 3: The first current value is smaller than the current value of the rated output current.

[0107] In this case, the UPS device 11 - 1 may control the current value of the first current to be a second current value, which is not greater than the current value of the rated output current of the UPS device 11 - 1 and not less than the first current value.

[0108] Specifically, in a possible implementation, the UPS device 11 - 1 may use the first current value as the current value of the first current, that is, the first current value and the second current value are equal.

[0109] In another possible implementation, the UPS device 11-1 may also receive indication information sent by any other UPS device, and control the current value of the first current to be the second current value according to the difference value indicated by the indication information and the first current value. Similar to the UPS device 11-2 in the second situation, assuming that the first current value of the UPS device 11-1 is 18A and the current value of the rated output current is 25A. If the difference value indicated by the indication information received by the UPS device 11-1 is 2A, the UPS device 11-1 may determine that the second current value is 20A, that is, the UPS device 11-1 outputs the first current with a current value of 20A.

[0110] It should be noted that, in order to protect the safety of the UPS device 11-1, the second current value should also not exceed the current value of the rated output current of the UPS device 11-1. When the UPS parallel system 40 includes more than two UPS devices, the UPS devices can send indication information according to a preset transmission relationship. For example, the UPS device 11-2 can send indication information to the UPS device 11-1, and the UPS device 11-1 can send indication information to the UPS device 11-N.

[0111] In this case, if the second current value of the UPS device 11-1 exceeds the current value of the rated output current of the UPS device 11-1, the UPS device 11-1 may send the difference between the second current value and the rated output current to the UPS device 11-N through indication information and output the rated output current.

[0112] It can be understood that in a scenario where the UPS parallel system 40 includes the UPS device 11 - 1 and the UPS device 11 - 2 , the sum of the current values ​​of the rated output currents of the UPS device 11 - 1 and the UPS device 11 - 2 is not less than the maximum total output current of the UPS parallel system 40 .

[0113] Based on the above situation 2 and situation 3, it can be seen that example 2 and example 3 provided in the embodiment of the present application can satisfy the following formula:

[0114] (I1:I2)=k(A1:A2)

[0115] Among them, I1 represents the current value of the first current of the UPS device 11-1, I2 represents the current value of the first current of the UPS device 11-2, A1 represents the available battery capacity of the battery group 12-1, A2 represents the available battery capacity of the battery group 12-2, and k is the adjustment current sharing coefficient.

[0116] Specifically, when the first current value of the UPS device 11-1 is greater than the current value of the rated output current of the UPS device 11-1, the value of k is less than 1; when the first current value of the UPS device 11-1 is less than the current value of the rated output current of the UPS device 11-1, the value of k is greater than or equal to 1; when the first current value of the UPS device 11-1 is equal to the current value of the rated output current of the UPS device 11-1, the value of k is equal to 1.

[0117] Example 3

[0118] In the embodiment of the present application, the first time point when the UPS device 11-1 performs UPS diversion can be the initial time point when multiple UPS devices are all powered by corresponding connected battery packs. The initial time point can be understood as the time point when the N UPS devices in the UPS parallel system 40 all start to be powered by the battery packs.

[0119] Specifically, there are various factors that lead to power supply failure in the power grid 20. For example, for the UPS device 11-1, the "power supply failure in the power grid 20" may be caused by an internal failure in the power grid 20, such as the interruption of the transmission line in the power grid 20; it may also be caused by an internal failure in the UPS device 11-1, such as damage to the interface of the UPS device 11-1 connecting the power grid 20; it may also be caused by other factors besides the internal failure of the UPS device 11-1 and the power grid 20, for example, it may also be caused by the interruption of the connection line between the UPS device 11-1 and the power grid 20. The other UPS devices are the same as the UPS device 11-1, and will not be described in detail.

[0120] Each UPS device can switch to the battery pack for power supply when the power grid 20 fails. However, due to the variety of factors that cause the power grid 20 to fail, in some scenarios, the N UPS devices in the UPS parallel system 40 will not switch to the battery pack for power supply synchronously.

[0121] If the interface between the UPS device 11-1 and the power grid 20 is damaged, the power grid 20 fails for the UPS device 11. Then, the UPS device 11-1 will switch to the battery pack 12-1 for power supply. However, for the UPS device 11-2, the power grid 20 still maintains power supply, so the UPS device 11-2 will not switch to the battery pack 12-2 for power supply.

[0122] In the embodiment of the present application, the initial time point specifically refers to the time point when each of the N UPS devices starts to use the battery pack for power supply. For example, if all UPS devices except the UPS device 11-1 in the UPS parallel system 40 have switched to the battery pack for power supply, then the time point when the UPS device 11-1 switches to the battery pack for power supply can be understood as the above-mentioned initial time point.

[0123] In view of this, after the UPS device 11-1 starts to use the battery group 12-1 for power supply, it is necessary to first determine whether the current time point is the initial time point. When the current time point is the current time point, the UPS device 11-1 obtains the capacity percentage of the battery group 12-1.

[0124] Exemplarily, after the UPS device 11-1 starts to use the battery pack 12-1 for power supply, it can also send a second query message to other UPS devices (UPS device 11-2 to UPS device 11-N), and the second query message can instruct other UPS devices that receive the second query message to feedback the current power supply status.

[0125] Among them, the current power supply device of the UPS device can be understood as whether the UPS device is currently powered by a battery pack. When the other UPS devices (UPS device 11-2 to UPS device 11-N) are all powered by battery packs, UPS device 11-1 can determine that the current time point is the initial time point. Then, UPS device 11-1 can obtain the capacity ratio of battery pack 12-1, and the specific implementation will not be repeated.

[0126] In a possible implementation, after determining that the current time point is the initial time point, the UPS device 11-1 may also send trigger information to other UPS devices (UPS device 11-2 to UPS device 11-N). Taking the UPS device 11-2 as an example, after receiving the trigger information, the UPS device 11-2 may determine that the current time point is the initial time point, thereby obtaining the capacity ratio of the battery group 12-2, and performing diversion according to the capacity ratio.

[0127] When there is at least one other UPS device that does not use the corresponding connected battery pack for power supply, it means that the current time point is not the initial time point. The UPS device 11-1 can output a second current to the load, and the second current is not greater than the rated output current of the first UPS device.

[0128] Exemplarily, the current value of the second current may be equal to the current value of the output current when the UPS device 11-1 is powered by the power grid 20. The current value of the second current may also be less than the current value of the output current when the UPS device 11-1 is powered by the power grid 20, so as to extend the backup time. In this case, the UPS device 11-1 may also send instruction information to the UPS device that is still powered by the power grid 20, so as to instruct the UPS device to increase the current value of the output current, thereby keeping the current value of the total output current unchanged.

[0129] It is understandable that the UPS device 11-1 may also receive the second query information sent by any other UPS device. After receiving the second query information sent by any other UPS device, the UPS device 11-1 may also feed back the current power supply status to the UPS device that sent the second query information.

[0130] The UPS device 11-1 can also receive trigger information sent by any other UPS device while continuously outputting the second current. After receiving the trigger information sent by any other UPS device, the UPS device 11-1 can determine the current time point as the initial time point, and then execute Figure 3 The process shown.

[0131] The above is described from the perspective of a method embodiment. It is understandable that in order to implement the above method, the UPS device may include hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0132] In view of this, the embodiment of the present application further provides a non-current balancing UPS device, which can be Figure 2 Any UPS device in the UPS parallel system 40 shown in the figure. For example, the non-current-balanced UPS device 500 provided in the embodiment of the present application can be as follows: Figure 5As shown, it mainly includes a power module 501 and a control module 502. In a possible implementation, the non-current-balanced UPS device 500 may also include a communication module 503. Among them:

[0133] The power module 501 is used to connect the first battery group corresponding to the non-current-balanced UPS device 500 and the power grid 20. Under the control of the control module 502, the power module 501 can transform the electric energy provided by the power grid 20 and the first battery group, such as one or more of the transformation modes such as rectification transformation, inversion transformation, boost transformation, and buck transformation, so as to output electric energy adapted to the load 30.

[0134] Exemplarily, the power module 501 may include one or more conversion circuits, and the received electric energy is converted by the conversion circuits. For example, the power module 501 may include one or more of a plurality of conversion circuits such as a rectifier conversion circuit, an inverter conversion circuit, a boost conversion circuit, and a buck conversion circuit. Conversion circuits with different functions may exist independently or may be integrated in the same circuit, and the embodiments of the present application do not impose many restrictions on this.

[0135] The communication module 503 is used to complete information exchange with other UPS devices. Exemplarily, the information exchange methods that the communication module 503 can adopt include but are not limited to wireless communication methods such as Bluetooth, Wireless-Fidelity (WiFi), Zigbee, Radio Frequency Identification (RFID), Long Range (Lora) wireless technology, Near Field Communication (NFC), etc., and can also include wired communication methods such as controller area network (CAN) communication, 485 communication, and fast Ethernet (FE) communication.

[0136] The control module 502 may be a processor or a controller, for example, a general-purpose central processing unit (CPU), a general-purpose processor, a digital signal processing (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of the present application. The above-mentioned processor may also be a combination that implements a computing function, for example, including a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.

[0137] Figure 5 The non-current-balanced UPS device 500 shown can implement any current-dividing method provided in the above method embodiments of the present application. Specifically, in one embodiment, the control module 502 can obtain the capacity ratio of the available battery capacity of the first battery group in the total available battery capacity of the multiple battery groups when each UPS device in the multiple UPS devices is powered by the corresponding connected battery group; the control module 502 can then control the power module 501 to output the first current to the load according to the capacity ratio, wherein the current ratio of the first current in the total output current of the UPS parallel system is positively correlated with the capacity ratio.

[0138] Exemplarily, when the control module 502 controls the power module 501 to output the first current to the load according to the capacity ratio, the control module 502 can calculate the first current value corresponding to the non-current-balanced UPS device 500 according to the capacity ratio and the total output current, and the first current value is equal to the product of the current value of the total output current and the capacity ratio; further, the control module 502 can control the power module 501 to output the first current according to the first current value.

[0139] Specifically, when the first current value is less than the current value of the rated output current of the non-current-balanced UPS device 500, the control module 502 can control the current value of the first current to be a second current value, which is not greater than the current value of the rated output current and not less than the first current value; when the first current value is the current value of the rated output current, the control module 502 can control the current value of the first current to be the current value of the rated output current; when the first current value is greater than the current value of the rated output current of the non-current-balanced UPS device 500, the control module 502 can control the current value of the first current to be a third current value, which is not greater than the current value of the rated output current of the non-current-balanced UPS device 500.

[0140] In order to maintain the total output current of the UPS parallel system 40, when the first current value is greater than the current value of the rated output current of the UPS device 500, the control module 502 can also control the communication module 503 to send an indication message to the second UPS device, and the indication message indicates the difference between the first current value and the third current value. The second UPS device can be any UPS device among the multiple UPS devices in the UPS parallel system except the non-current-balanced UPS device 500.

[0141] In order to maintain the total output current of the UPS parallel system 40, when the first current value is less than the current value of the rated output current of the non-current-balanced UPS device 500, the control module 502 can also control the current value of the first current to be a second current value according to the received indication information after the communication module 503 receives the indication information sent by any other UPS device, wherein the second current value is the sum of the difference between the first current value and the indication of the indication information.

[0142] In the embodiment of the present application, when obtaining the capacity percentage of the first battery group, the control module 502 can control the communication module 503 to send a first query message to other UPS devices among the multiple UPS devices except the non-current balancing UPS device 500, and the first query message is used to instruct other UPS devices to feedback the available battery capacity of the corresponding connected battery group; the control module 502 can then obtain the capacity percentage based on the available battery capacity of the first battery group and the available battery capacity of the corresponding connected battery groups of other UPS devices.

[0143] It is understandable that the control module 502 can also control the communication module 503 to feedback the available battery capacity of the first battery group to any other UPS device that sends the first query information after the communication module 503 receives the first query information sent by any other UPS device except the non-current-sharing UPS device 500.

[0144] In one possible implementation, after starting to use the first battery pack for power supply, the control module 502 can also control the communication module 503 to send a second query message to other UPS devices except the non-current-sharing UPS device 500, and the second query message can instruct the other UPS devices to feedback the current power supply status; when the other UPS devices are all powered by the battery pack, it is determined that each of the multiple UPS devices is powered by the corresponding connected battery pack.

[0145] In addition, when there is at least one other UPS device that is not powered by the corresponding connected battery pack, the control module 502 can also control the power module 501 to output a second current to the load, and the second current is not greater than the rated output current of the non-current-balanced UPS device 500.

[0146] It is understandable that the control module 502 can also control the communication module 503 to feedback the current power supply status to any other UPS device that sends the second query information after the communication module 503 receives the second query information sent by any other UPS device except the non-current-sharing UPS device 500.

[0147] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0148] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0149] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0150] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0151] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of protection of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A UPS device, characterized in that: Applicable to an uninterruptible power supply UPS parallel system, the UPS parallel system includes multiple battery packs and multiple UPS devices, the multiple UPS devices and the multiple battery packs are correspondingly connected, any UPS device among the multiple UPS devices is a first UPS device, the first UPS device includes a control module, a power module and a communication module, wherein: The power module is used to connect to a first battery pack corresponding to the first UPS device; The control module is used for: When each UPS device in the plurality of UPS devices is powered by a corresponding connected battery pack, obtaining a capacity ratio of the available battery capacity of the first battery pack to the total available battery capacity of the plurality of battery packs; Controlling the power module to output a first current to the load according to the capacity proportion, wherein the current proportion of the first current in the total output current of the UPS parallel system is positively correlated with the capacity proportion; The control module is also used to: when there is a second UPS device among the multiple UPS devices that uses the power grid to supply power, control the power module to output a second current to the load, the second current is not greater than the rated output current of the first UPS device, and control the communication module to send indication information to the second UPS device, the indication information is used to instruct the UPS device to increase the output current value.

2. The UPS device according to claim 1, characterized in that: The control module is specifically used for: According to the capacity proportion and the total output current, a first current value corresponding to the first UPS device is calculated, where the first current value is equal to the product of the current value of the total output current and the capacity proportion; The power module is controlled to output the first current according to the first current value.

3. The UPS device according to claim 1 or 2, characterized in that: The control module is specifically used for: When the first current value is less than the current value of the rated output current of the first UPS device, controlling the current value of the first current to be a second current value, the second current value being not greater than the current value of the rated output current and not less than the first current value; When the first current value is the current value of the rated output current of the first UPS device, controlling the current value of the first current to be the current value of the rated output current; When the first current value is greater than the current value of the rated output current of the first UPS device, the current value of the first current is controlled to be a third current value, and the third current value is not greater than the current value of the rated output current of the first UPS device.

4. The UPS device according to claim 3, characterized in that: When the first current value is greater than the current value of the rated output current of the first UPS device, the control module is further configured to: When there is a second UPS device among the multiple UPS devices that uses the power grid to supply power, the communication module is controlled to send indication information to the second UPS device, where the indication information is used to indicate a difference between the first current value and the third current value.

5. The UPS device according to claim 3, characterized in that: When the first current value is less than the current value of the rated output current of the first UPS device, the control module is further configured to: When the communication module receives the indication information sent by any other UPS device, the current value of the first current is controlled to be the second current value according to the received indication information, wherein the second current value is the sum of the difference between the first current value and the indication of the indication information.

6. The UPS device according to claim 1, characterized in that: The control module is specifically used for: Controlling the communication module to send first query information to other UPS devices among the plurality of UPS devices except the first UPS device, wherein the first query information is used to instruct the other UPS devices to feedback available battery capacity of corresponding connected battery packs; The capacity proportion is obtained according to the available battery capacity of the first battery group and the available battery capacity of the battery groups correspondingly connected to the other UPS devices.

7. The UPS device according to claim 1, characterized in that: The control module is also used for: After starting to use the first battery pack to supply power, controlling the communication module to send second query information to other UPS devices except the first UPS device, wherein the second query information is used to instruct the other UPS devices to feedback the current power supply status; When the other UPS devices are all powered by battery packs, it is determined that each UPS device in the plurality of UPS devices is powered by a correspondingly connected battery pack.

8. The UPS device according to claim 7, characterized in that: The control module is also used for: When there is at least one other UPS device that is not powered by a correspondingly connected battery pack, the power module is controlled to output the second current to the load.

9. The UPS device according to claim 1, characterized in that: The control module is also used for: After the communication module receives the first query information sent by any other UPS device except the first UPS device, the communication module is controlled to feed back the available battery capacity of the first battery group to any other UPS device.

10. The UPS device according to claim 1, characterized in that: The control module is also used for: After the communication module receives the second query information sent by any other UPS device except the first UPS device, the communication module is controlled to feed back the current power supply status to any other UPS device.

11. A diversion method, characterized in that: A first UPS device applied to a UPS parallel system, the UPS parallel system comprising a plurality of UPS devices and a plurality of battery packs, the plurality of UPS devices and the plurality of battery packs being connected correspondingly, the first UPS device being any UPS device among the plurality of UPS devices, the method comprising: When each UPS device in the plurality of UPS devices is powered by a correspondingly connected battery pack, obtaining a capacity ratio of an available battery capacity of a first battery pack in a total available battery capacity of the plurality of battery packs, the first battery pack being a battery pack correspondingly connected to the first UPS device; Outputting a first current to the load according to the capacity proportion, wherein the current proportion of the first current in the total output current of the UPS parallel system is positively correlated with the capacity proportion; When there is a second UPS device among the multiple UPS devices that uses the power grid to supply power, a second current is output to the load, the second current is no greater than the rated output current of the first UPS device, and indication information is sent to the second UPS device, wherein the indication information is used to instruct the UPS device to increase the output current value.

12. The method according to claim 11, characterized in that Outputting a first current to a load according to the capacity proportion includes: According to the capacity proportion and the total output current, a first current value corresponding to the first UPS device is calculated, where the first current value is equal to the product of the total output current and the capacity proportion; The first current is output according to the first current value.

13. The method according to claim 12, characterized in that Outputting the first current according to the first current value includes: When the first current value is less than the current value of the rated output current of the first UPS device, controlling the current value of the first current to be a second current value, the second current value being not greater than the current value of the rated output current and not less than the first current value; When the first current value is the current value of the rated output current, controlling the current value of the first current to be the current value of the rated output current; When the first current value is greater than the current value of the rated output current of the first UPS device, the current value of the first current is controlled to be a third current value, and the third current value is not greater than the current value of the rated output current of the first UPS device.

14. The method according to claim 13, characterized in that When the first current value is greater than a current value of a rated output current of the first UPS device, the method further includes: When there is a second UPS device among the plurality of UPS devices that uses the power grid to supply power, indication information is sent to the second UPS device, where the indication information is used to indicate a difference value obtained by subtracting the third current value from the first current value.

15. The method according to claim 13 or 14, characterized in that When the first current value is less than a current value of a rated output current of the first UPS device, the method further includes: After receiving the indication information sent by any other UPS device, the current value of the first current is controlled to be the second current value according to the received indication information, wherein the second current value is the sum of the difference between the first current value and the indication of the indication information.

16. The method according to claim 11, characterized in that Obtaining a capacity ratio of the available battery capacity of the first battery pack to the total available battery capacity of the plurality of battery packs includes: Sending first query information to other UPS devices among the plurality of UPS devices except the first UPS device, wherein the first query information is used to instruct the other UPS devices to feedback available battery capacity of corresponding connected battery packs; The capacity proportion is obtained according to the available battery capacity of the first battery group and the available battery capacity of the battery groups correspondingly connected to the other UPS devices.

17. The method according to claim 11, characterized in that The method further comprises: After starting to use the first battery pack to supply power, sending second query information to other UPS devices, wherein the second query information is used to instruct the other UPS devices to feedback current power supply status; When the other UPS devices are all powered by battery packs, it is determined that each UPS device in the plurality of UPS devices is powered by a correspondingly connected battery pack.

18. The method according to claim 17, characterized in that After sending the second query information to the other UPS device, the method further includes: When there is at least one other UPS device that is not powered by a correspondingly connected battery pack, a second current is output to the load.

19. The method according to claim 11, characterized in that The method further comprises: After receiving the first query information sent by any other UPS device except the first UPS device, the available battery capacity of the first battery group is fed back to the other UPS device.

20. The method according to claim 11, characterized in that The method further comprises: After receiving the second query information sent by any other UPS device except the first UPS device, the current power supply status is fed back to the other UPS device.

21. A UPS parallel system, characterized in that: The invention comprises a plurality of UPS devices and a plurality of battery packs, wherein the plurality of UPS devices and the plurality of battery packs are connected correspondingly, and any UPS device among the plurality of UPS devices is a UPS device according to any one of claims 1 to 10, wherein: Each battery pack is used to supply power to the corresponding connected UPS device.

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