Power supply control method

Abstract

The invention discloses a power supply control method which is used for controlling a power supply system, the power supply system is used for supplying power to a low-voltage load unit, the power supply system comprises at least one power supply source and power supply devices arranged in one-to-one correspondence with the power supply sources, and the power supply devices are connected with the corresponding power supply sources. The power supply device comprises a power conversion module; wherein the power conversion module of at least one power supply device comprises a battery unit; the power supply control method comprises the following steps: in at least one power supply device, taking the power supply device with a power conversion module comprising a battery unit as an energy storage power supply device, and judging whether all power supplies are in a power-off state or not; if yes, the energy storage power supply device supplies power to a low-voltage load unit; and if not, the power supply in the power supply state and the corresponding power supply device supply power to the low-voltage load unit. According to the power supply control method, the uninterrupted power supply function can be realized by utilizing the energy storage power supply device of the power supply system.

Description

[0001] This case is a divisional application based on the invention patent with application date of August 15, 2024, application number: 202411119241.8, and name: "Power supply system and control method". Technical Field

[0002] The present invention relates to the technical field of power supply, and in particular to a power supply control method. Background Art

[0003] With the rapid development of digital economy, AI, cloud computing and other industries, the construction of digital infrastructure for data centers such as supercomputing centers and intelligent computing centers has received more and more attention. Data centers have high requirements for the stability of power supply performance. Therefore, reducing the construction and use costs of new data centers by optimizing the power supply system has become an urgent problem to be solved in the industry.

[0004] like Figure 1 The low-voltage loads (e.g., IT devices) of the traditional data center shown in the figure are powered by an AC UPS device. The AC port establishes a DC bus equivalent to the total battery voltage through a primary conversion unit. The batteries are grouped in series and connected to the DC bus through a secondary conversion unit. The voltage is then stepped down to the low-voltage range required by the low-voltage load through a tertiary conversion unit. This power supply method is supported by the UPS device for a short time when the AC source such as the power grid or generator cannot supply power. It has several disadvantages:

[0005] (1) Some power circuits of UPS equipment are redundant, but the utilization rate is not high, but it must be online for a long time, which leads to low efficiency and high cost of the power supply circuit;

[0006] (2) The battery capacity of UPS equipment is small, the voltage is low and the life is short, so it is not suitable for energy storage. The battery of UPS equipment cannot be used for peak and valley regulation in time-sharing electricity price occasions, so the battery operating cost of UPS equipment is high;

[0007] (3) The UPS device outputs an AC voltage, which needs to be converted to a low-voltage DC voltage by an AC / DC converter before being supplied to the IT load, resulting in low efficiency;

[0008] (4) When connecting to energy storage batteries, independent battery equipment needs to be configured, which reduces site utilization, increases the length of air conditioning and cooling pipelines, and increases costs and energy consumption. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide a power supply control method to reduce the use cost of a power supply system.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is: a power supply control method, the power supply control method is used to control a power supply system, the power supply system is used to supply power to a low-voltage load unit, the power supply system includes at least one power supply and a power supply device arranged in a one-to-one correspondence with the power supply, the power supply device is connected to the corresponding power supply, and the power supply device includes a power conversion module; wherein at least one power conversion module of the power supply device includes a battery unit;

[0011] The power supply control method comprises the following steps: in at least one power supply device, a power supply device including a power conversion module and a battery unit is used as an energy storage power supply device to determine whether all power supplies are in a power-off state; if so, the energy storage power supply device supplies power to the low-voltage load unit; if not, the power supply in the power supply state and the corresponding power supply device supply power to the low-voltage load unit.

[0012] Furthermore, in the energy storage and power supply device, the power conversion module also includes a primary conversion unit and a secondary conversion unit, the input end of the primary conversion unit is connected to the power supply, the output end of the secondary conversion unit is connected to the battery unit, and the secondary conversion unit includes a secondary converter.

[0013] Furthermore, the method further comprises the steps of: obtaining the state of charge (SOC) of the battery module in the battery unit in the energy storage and power supply device; N , Power State SOP N , and obtain the average state of charge SOC of the battery cell avg and average power state SOP avg , according to the following formula to obtain the preset output power P N :

[0014]

[0015] Among them, K1 and K2 are value coefficients, P avg is the average value of the output powers of all secondary converters in the secondary conversion unit corresponding to the battery unit;

[0016] The power at the output end of the secondary converter corresponding to the battery module is adjusted to the preset output power P N .

[0017] Furthermore, the value range of the coefficient K1 is The value range of the coefficient K2 is SOC max is the maximum state of charge, SOC min The minimum state of charge, SOP max For maximum power state, SOPmin The minimum power state.

[0018] Furthermore, when the state of charge SOC needs to be adjusted N When the unbalanced weight is adjusted, the value coefficient K1 is adjusted; when the power state SOP needs to be adjusted N The weight of the imbalance degree is used to adjust the value coefficient K2.

[0019] Furthermore, the energy storage and power supply device further comprises a control unit, which obtains the state of charge (SOC) of each battery module. N , Power State SOP N , and according to the state of charge SOC N , the power state SOP N To obtain the preset output power P N .

[0020] Furthermore, the battery unit includes a battery switch and a plurality of battery modules connected in series, the secondary converter includes a first input port and a second input port, the plurality of battery modules are arranged in a one-to-one correspondence with the plurality of secondary converters, the first input port of the secondary converter is connected to one end of the corresponding battery module, a first switch is provided between the first input port of the secondary converter and one end of the corresponding battery module, the second input port of the secondary converter is connected to the other end of the corresponding battery module, and a second switch is provided between the second input port of the secondary converter and the other end of the corresponding battery module; the plurality of secondary converters are arranged in sequence, between two adjacent secondary converters, the second input port of one of the secondary converters is connected to the first input port of another of the secondary converters, and a series switch is provided between the second input port of one of the secondary converters and the first input port of another of the secondary converters.

[0021] Furthermore, when all power supplies are in a power-off state, power is supplied to the secondary conversion unit only through the battery unit of the energy storage power supply device.

[0022] Furthermore, in the energy storage and power supply device, when the secondary conversion unit is powered only by the battery unit, output power adjustment is performed on all the secondary converters in the secondary conversion unit.

[0023] Furthermore, in the energy storage power supply device, when the power supply corresponding to the energy storage power supply device is in a power supply state, the primary conversion unit and the battery unit jointly supply power to the secondary conversion unit.

[0024] The beneficial effect of the present invention is that the power supply control method provided by the present invention can realize the uninterruptible power supply function by utilizing the energy storage power supply device of the power supply system, and ensure the reliability of power supply to the low-voltage load unit when all the power supplies of the power supply system are powered off. The power supply control system using the power supply control method provided by the present invention does not need to set up a UPS device, but sets a battery unit in the power conversion module of at least one power supply device of the power supply control system, so that the low-voltage load unit can be powered when all the power supplies in the power supply system are in a power-off state. The battery unit of the power supply device is a part of the power conversion module, which can improve the site utilization rate of the power supply system. The power supply device of the power supply system controlled by the power supply method provided by the present invention can realize the voltage reduction function through the battery unit and directly supply power to the secondary conversion unit. Therefore, the power supply system reduces the number of conversion units compared with the traditional UPS device. The power supply control method provided by the present invention can improve the loop efficiency of the power supply device including the battery unit, and its construction cost and use cost are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the circuit schematic diagram of the traditional power supply system;

[0026] Figure 2 A schematic diagram of a power supply system according to the present invention in one embodiment;

[0027] Figure 3 It is a framework diagram of the power supply system of the present invention;

[0028] Figure 4 for Figure 2 Schematic diagram of the power conversion module of the power supply device A;

[0029] Figure 5 for Figure 2 A schematic diagram of a power conversion module of the power supply device A in another optional implementation manner;

[0030] Figure 6 for Figure 2 The schematic diagram of the secondary conversion circuit of the power supply device B in the series state;

[0031] Figure 7 for Figure 2 Schematic diagram of the secondary conversion circuit of power supply device B in parallel state.

[0032] Description of labels:

[0033] 1. Power supply; 11. Distribution network; 12. Backup power supply;

[0034] 2. Power supply device; 21. Load bus unit; 22. Power conversion module; 23. Primary conversion unit; 231. Primary converter; 24. Secondary conversion unit; 241. Secondary converter; 26. Battery unit; 261. Battery module; 27. Isolation unit;

[0035] 3. Low voltage load unit; 31. Load device;

[0036] 4. Three-level transformation unit. DETAILED DESCRIPTION

[0037] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0038] Please refer to Figures 2 to 7 The present invention provides a power supply control method, the power supply control method is used to control a power supply system, the power supply system is used to supply power to a low-voltage load unit, the power supply system includes at least one power supply and a power supply device arranged in a one-to-one correspondence with the power supply, the power supply device is connected to the corresponding power supply, and the power supply device includes a power conversion module; wherein at least one power conversion module of the power supply device includes a battery unit;

[0039] The power supply control method comprises the following steps: in at least one power supply device, a power supply device including a power conversion module and a battery unit is used as an energy storage power supply device to determine whether all power supplies are in a power-off state; if so, the energy storage power supply device supplies power to the low-voltage load unit; if not, the power supply in the power supply state and the corresponding power supply device supply power to the low-voltage load unit.

[0040] As can be seen from the above description, the beneficial effect of the present invention is that the power supply control method provided by the present invention can realize the uninterruptible power supply function by utilizing the energy storage power supply device of the power supply system, and ensure the reliability of power supply to the low-voltage load unit when all the power supplies of the power supply system are powered off. The power supply control system using the power supply control method provided by the present invention does not need to set up a UPS device, but sets a battery unit in the power conversion module of at least one power supply device of the power supply control system, so that the low-voltage load unit can be powered when all the power supplies in the power supply system are in a power-off state. The battery unit of the power supply device is a part of the power conversion module, which can improve the site utilization rate of the power supply system. The power supply device of the power supply system controlled by the power supply method provided by the present invention can realize the voltage reduction function through the battery unit and directly supply power to the secondary conversion unit. Therefore, the power supply system reduces the number of conversion units compared with the traditional UPS device. The power supply control method provided by the present invention can improve the loop efficiency of the power supply device including the battery unit, and its construction cost and use cost are low.

[0041] Furthermore, in the energy storage and power supply device, the power conversion module also includes a primary conversion unit and a secondary conversion unit, the input end of the primary conversion unit is connected to the power supply, the output end of the secondary conversion unit is connected to the battery unit, and the secondary conversion unit includes a secondary converter.

[0042] As can be seen from the above description, the power conversion module 22 of at least one power supply device 2 in the power supply system provided by the present invention includes a battery unit 26, so that the low-voltage load unit 3 can be powered when all power sources 1 in the power supply system are in a power-off state. The battery unit 26 of the power supply device 2, as a part of the power conversion module 22, can improve the utilization rate of the site where the power supply system is set up. The power supply device of the power supply system can realize the voltage reduction function through the battery unit and directly supply power to the secondary conversion unit. Therefore, the power supply system reduces the number of conversion units compared to the traditional UPS device. The power supply device including the battery unit in the power supply system provided by the present invention has high loop efficiency and low construction and use costs.

[0043] Furthermore, the method further comprises the steps of: obtaining the state of charge (SOC) of the battery module in the battery unit in the energy storage and power supply device; N , Power State SOP N , and obtain the average state of charge SOC of the battery cell avg and average power state SOP avg , according to the following formula to obtain the preset output power P N :

[0044]

[0045] Among them, K1 and K2 are value coefficients, P avg is the average value of the output powers of all secondary converters in the secondary conversion unit corresponding to the battery unit;

[0046] The power at the output end of the secondary converter corresponding to the battery module is adjusted to the preset output power P N .

[0047] Furthermore, the value range of the coefficient K1 is The value range of the coefficient K2 is SOC max is the maximum state of charge, SOC min The minimum state of charge, SOP max For maximum power state, SOP min The minimum power state.

[0048] From the above description, it can be seen that the power supply control method provided by the present invention can control the output power of the secondary converter 241 by the control unit to adjust the working state of each battery module 261, thereby realizing active control of each battery module 261, and performing dynamic power distribution on all load buses to fully utilize all battery energy, thereby improving battery life and reducing operation and maintenance costs.

[0049] Furthermore, when the state of charge SOC needs to be adjusted N When the unbalanced weight is adjusted, the value coefficient K1 is adjusted; when the power state SOP needs to be adjusted N The weight of the imbalance degree is used to adjust the value coefficient K2.

[0050] From the above description, it can be seen that K1 and K2 are used to adjust the state of charge SOC N and power state SOP N At output power P N The control weight ratio in

[0051] Furthermore, the energy storage and power supply device further comprises a control unit, which obtains the state of charge (SOC) of each battery module. N , Power State SOP N , and according to the state of charge SOC N , the power state SOP N To obtain the preset output power P N .

[0052] Furthermore, the battery unit includes a battery switch and a plurality of battery modules connected in series, the secondary converter includes a first input port and a second input port, the plurality of battery modules are arranged in a one-to-one correspondence with the plurality of secondary converters, the first input port of the secondary converter is connected to one end of the corresponding battery module, a first switch is provided between the first input port of the secondary converter and one end of the corresponding battery module, the second input port of the secondary converter is connected to the other end of the corresponding battery module, and a second switch is provided between the second input port of the secondary converter and the other end of the corresponding battery module; the plurality of secondary converters are arranged in sequence, between two adjacent secondary converters, the second input port of one of the secondary converters is connected to the first input port of another of the secondary converters, and a series switch is provided between the second input port of one of the secondary converters and the first input port of another of the secondary converters.

[0053] From the above description, please combine Figure 3For reference, the present invention provides a method of controlling the switches of the secondary conversion unit 24 to control the series or parallel connection of the secondary converters 241 according to actual use requirements.

[0054] Furthermore, when all power supplies are in a power-off state, power is supplied to the secondary conversion unit only through the battery unit of the energy storage power supply device.

[0055] Furthermore, in the energy storage and power supply device, when the secondary conversion unit is powered only by the battery unit, output power adjustment is performed on all the secondary converters in the secondary conversion unit.

[0056] From the above description, it can be seen that when the secondary conversion unit is powered only by battery cells, output power adjustment of all secondary converters of the secondary conversion unit can make the battery cells corresponding to the secondary conversion unit tend to a balanced state, thereby improving the service life of the battery cells in the power supply system.

[0057] Furthermore, in the energy storage power supply device, when the power supply corresponding to the energy storage power supply device is in a power supply state, the primary conversion unit and the battery unit jointly supply power to the secondary conversion unit.

[0058] Example

[0059] Please refer to Figures 2 to 7 An embodiment of the present invention is to provide a power supply system, which can be used to supply power to a load device 31 of a data center such as a supercomputing center and an intelligent computing center. The power supply system includes at least one power supply 1 and a power supply device 2 which is arranged in a one-to-one correspondence with the power supply 1. The power supply includes a distribution network 11 and a backup power supply 12. The power supply device 2 includes a load bus unit 21 and a power conversion module 22. The power supply device 2 is connected to the power supply 1. The power conversion module 22 includes a primary conversion unit 23 and a secondary conversion unit 24. In order to ensure the reliability of the power supply system for the load device 31 of the data center, a power supply unit should be set in the power conversion module 22 of at least one power supply device 2 in the power supply system.

[0060] For details, please refer to Figure 2 and Figure 3The power supply system designed in this embodiment includes a power supply A, a power supply device A corresponding to the power supply A, a power supply B, and a power supply device B corresponding to the power supply B; the power supply device A and the power supply device B both include an isolation unit 27, a load bus unit 21, a control unit and a power conversion module 22, the input end of the isolation unit 27 is connected to the corresponding power supply 1, the output end of the isolation unit 27 is connected to the input end of the power conversion module 22, the output end of the power conversion module 22 is connected to the load bus unit 21, and the control unit is communicatively connected to the power conversion module 22, the isolation unit 27 and the load bus unit 21 respectively.

[0061] Optionally, the isolation unit 27 can be a power frequency transformer or an isolation transformer to output an AC voltage; the isolation unit 27 can also be a rectifier to output a DC voltage. The primary conversion unit 23 can select an AC-DC conversion unit or a DC-DC conversion unit according to the output of the AC voltage or DC voltage of the isolation unit 27, and the power conversion module 22 has the function of being connected in series or in parallel.

[0062] The power conversion module 22 of the power supply device A includes a primary conversion unit 23, a secondary conversion unit 24 and a battery unit 26. The power supply device A can be used as an energy storage power supply device. When all power sources 1 in the power supply system are in a power-off state, the battery unit 26 of the power conversion module 22 of the power supply device A can supply power to the low-voltage load unit 3 to ensure the reliability of the data center operation.

[0063] The power conversion module 22 of the power supply device B includes a primary conversion unit 23 and a secondary conversion unit 24. The power conversion module 22 of the power supply device B may optionally include or exclude a battery unit 26. However, the power conversion module 22 of the power supply device B in this embodiment does not include a battery unit 26.

[0064] Therefore, in the power conversion module 22 of the power supply device B of this embodiment, the input end of the secondary conversion unit 24 is connected to the output end of the primary conversion unit 23. Figure 6 , 7 and Figure 4 By comparison, it can be seen that the power conversion module 22 of the power supply device B connects the multiple secondary converters 241 in the secondary conversion unit 24 in series (such as Figure 6 as shown) or in parallel (as Figure 7 The bypass connection conductor (shown) is used to replace the battery unit 26 in the power supply device A, and the overall structure of the power conversion module 22 of the power supply device A and the power conversion module 22 of the power supply device B is unchanged. Figure 2As shown, the power supply device B can be provided with multiple primary conversion units 23, and the connection methods of the multiple primary conversion units 23 and the multiple secondary converters 241 of the corresponding secondary conversion units 24 are different, but the total output power of the secondary conversion units 24 meets the total power demand of the load bus unit 21.

[0065] In this embodiment, the load device 31 can be an IT device in a data center or other equipment powered by a safe low voltage. The load device 31 includes two power receiving ports, each of which can provide all the power required by the load device 31. The load bus unit 21 of the power supply device A is connected to one of the power receiving ports of the load device 31, and the load bus unit 21 of the power supply device B is connected to the other power receiving port of the load device 31.

[0066] Among them, the control unit of the power supply device 2 can control the output power of the secondary conversion unit 24, so the voltage of the two power receiving ports of the load device 31 powered by the power supply system can be adjusted by the control unit of the power supply device A and the control unit of the power supply device B respectively, so that different powers are input to the two power receiving ports respectively, and droop control is realized. Among them, droop control is a current sharing control method adopted when independent voltage source type power supplies are connected in parallel. Because the regulated voltages of different voltage sources are different, if they are directly connected in parallel, it will lead to the inability to share current between different voltage sources, and the power supply with high regulated voltage has a large output power. Droop control is to make the regulated voltage of the power supply decrease as its output power increases (the regulated voltage value is inversely proportional to the power), similar to a drooping curve. The regulated voltage value of the power supply running on this curve can automatically balance the power.

[0067] In this embodiment, all devices from the power port of the power supply device 2 to the load bus unit 21 are integrated in the power supply device 2 , and the low-voltage load unit 3 can be selected to be integrated in the power supply device 2 or not.

[0068] In this embodiment, various load devices 31 with different power requirements in data centers such as supercomputing centers and intelligent computing centers can form a low-voltage load unit 3. In order for the power supply system in this embodiment to meet the power supply requirements of various load devices 31 in various low-voltage load units 3, the load bus unit 21 of the power supply device 2 includes multiple load buses, and the load bus unit 21 includes multiple load buses. The secondary conversion unit 24 of the power supply device 2 includes multiple secondary converters 241, and the multiple secondary converters 241 are arranged one-to-one with the multiple load buses, and the output end of the secondary converter 241 is connected to the corresponding load bus. It is easy to understand that in the power supply device A, the input end of the secondary converter 241 is connected to the battery unit 26 (refer to Figure 4 ); In the power supply device B, the input terminals of the plurality of secondary converters 241 are connected in series (refer to Figure 6 ) or in parallel (refer to Figure 7 ) and then connected to the output end of the first-stage conversion unit 23.

[0069] For ease of understanding, the above steps are explained as follows:

[0070] like Figure 2 The power supply device B shown in FIG. 1 may be provided with a plurality of secondary conversion units 24, and the plurality of secondary converters 241 of each secondary conversion unit 24 may be connected in series and parallel in different ways (eg, Figure 6 , 7 As shown), the total power should meet the total power of N low-voltage loads.

[0071] Please Figure 4 For reference and ease of understanding, the secondary conversion unit 24 includes N secondary converters 241 arranged in sequence, the N secondary converters 241 are numbered in sequence, the secondary converter 241 includes a first input port and a second input port, the battery unit 26 includes N battery modules 261 connected in series, the N battery modules 261 are arranged one-to-one with the N second converters, the first input port of the secondary converter 241 is connected to one end of the corresponding battery module 261, and a first switch ( Figure 4 The second input port of the secondary converter 241 is connected to the other end of the corresponding battery module 261, and a second switch ( Figure 4 Between two adjacent secondary converters 241, the second input port of one secondary converter 241 is connected to the first input port of the other secondary converter 241, and a series switch ( Figure 4 KS_2, …, KS_N).

[0072] The control unit can control the closing or opening of each battery switch, the first switch, the second switch and the series switch to switch the parallel state or the series state of each secondary converter 241 to meet the actual application requirements.

[0073] The power conversion module 22 of the power supply device 2 may include M battery cells 26 and M secondary conversion units 24, the input end of the secondary conversion unit 24 is connected to the corresponding battery cell 26, and the output end of the primary conversion unit 23 is respectively connected to the M battery cells 26. In addition, the battery cell 26 may be a modular structure connected in series, that is, the battery cell 26 includes N battery modules 261, and the N battery modules 261 are connected in series to form a group. After the N battery modules 261 are connected in series, the voltage range of the battery cell 26 is consistent with the DC output voltage range of the primary conversion unit 23.

[0074] Further references Figure 4 The battery unit 26 includes N battery modules 261 connected in series, and the N battery modules 261 are arranged one by one with the N secondary converters 241. The input end of the secondary converter 241 is connected to the corresponding battery module 261. In this connection mode, by controlling the first switch (K1_1 to K1_N), the second switch (K2_1 to K2_N) and the series switch (KS_2 to KS_N) of each secondary converter 241 and the battery switch KB of the battery unit 26, at least the following three working modes can be realized:

[0075] The first mode is that all the battery cells 26 participate in power supply, all the first switches K1_1 to K1_N of all the battery cells 26 are closed, all the second switches K2_1 to K2_N of all the battery cells 26 are closed, the battery switches KB of all the battery cells 26 are closed, and all the series switches KS_2 to KS_N of all the secondary conversion units 24 are disconnected. At this time, the primary converter 231 and all the battery cells 26 jointly supply power to all the secondary conversion units 24, and at the same time, the primary converter 231 can charge each battery cell 26;

[0076] The second mode is that some of the battery cells 26 participate in power supply; in the battery cells 26 that do not participate in power supply, except for the first switch K1_1 and the second switch KN_2 that are closed, the other first switches and the second switches are all disconnected, the power switch KB of the battery cells 26 that do not participate in power supply is disconnected, and all the series switches KS_2 to KS_N of the secondary conversion units 24 corresponding to the battery cells 26 that do not participate in power supply are closed, so that the secondary conversion units 24 corresponding to the battery cells 26 that do not participate in power supply are directly powered by the primary conversion unit 23, and the corresponding battery cells 26 are disconnected; in the battery cells 26 that participate in power supply, all the second switches K2_1 to K2_N are closed, the power switch KB of the battery cells 26 that participate in power supply is closed, and all the series switches KS_2 to KS_N of the secondary conversion units 24 corresponding to the battery cells 26 that participate in power supply are disconnected, and the part of the secondary conversion units 24 is powered by the corresponding power supply unit;

[0077] The third mode is that all battery units 26 do not participate in power supply. Except for the first switch K1_1 and the second switch KN_2 of all power supply units, all first switches and all second switches of all power supply units are disconnected, the power switch KB of all power supply units is disconnected, and all series switches KS_2 to KS_N of all secondary conversion units 24 are closed. At this time, the primary conversion unit 23 supplies power to all secondary conversion units 24, and the total power output of the secondary converters 241 of the M secondary conversion units 24 is equal to the total power demand of the corresponding load bus.

[0078] When the power supply 1 is in the power supply state, the primary conversion unit and the battery unit 26 jointly supply power to the secondary conversion unit.

[0079] In an optional embodiment, if Figure 5 As shown, the primary conversion unit 23 may include a plurality of primary converters 231 connected in series, and the battery unit 26 includes a plurality of battery modules 261 connected in series, the plurality of battery modules 261 are connected one-to-one with the plurality of primary converters 231, and the battery modules 261 are connected with the output ends of the corresponding primary converters 231. In this embodiment, each battery module 261 may be independently grouped, and the specification of the corresponding battery module 261 may be determined according to the specification of the selected primary converter 231 and the output voltage of the isolation unit 27.

[0080] The power supply system described in this embodiment can be controlled by the following power supply control method, which includes the following steps: in at least one power supply device 2, the power supply device 2 including the power conversion module 22 and the battery unit 26 is used as an energy storage power supply device to determine whether all power sources 1 are in a power-off state; if so, the energy storage power supply device supplies power to the low-voltage load unit 3; if not, the power supply 1 in the power supply state and the corresponding power supply device 2 supply power to the low-voltage load unit 3.

[0081] It is easy to understand that in this embodiment:

[0082] 1. When both the power supply A and the power supply B are in the power supply state, the power supply device A and the power supply device B jointly supply power to the low-voltage load unit 3.

[0083] 2. When power supply A is in the power supply state and power supply B is in the power-off state, the primary conversion unit 23 and the battery unit 26 of the power supply device A jointly supply power to the secondary conversion unit 24, and then the secondary conversion unit 24 supplies power to the load bus; the power supply device B does not participate in the power supply.

[0084] 3. When power supply A is in a power-off state and power supply B is in a power-on state, the primary conversion unit 23 of power supply device B supplies power to the secondary conversion unit 24, and then the secondary conversion unit 24 supplies power to the load bus; power supply device A does not participate in power supply.

[0085] 4. When both power supply devices A and B are in a power-off state, the battery unit 26 of power supply device A supplies power to its secondary conversion unit 24, and then the secondary conversion unit 24 supplies power to the load bus; power supply device B does not participate in the power supply.

[0086] In this embodiment, in the energy storage and power supply device, the state of charge SOC of the battery module 261 in the battery unit 26 is obtained. N , Power State SOP N , and obtain the average state of charge SOC of the battery cell 26 avg and average power state SOP avg , according to the following formula to obtain the preset output power P N ;

[0087]

[0088] Among them, K1 and K2 are value coefficients, P avg is the average value of the output power of all the secondary converters 241 in the secondary conversion unit 24 corresponding to the battery unit 26;

[0089] In this embodiment, K1 and K2 are used to adjust the state of charge SOC N and power state SOP N At output power P N The control weight ratio in. The value range of coefficient K1 can be The value range of coefficient K2 can be SOC max is the maximum state of charge, SOC min The minimum state of charge, SOP max For maximum power state, SOP min The minimum power state.

[0090] Specifically, the initial values ​​of K1 and K2 are both 1, so that the total power of N converters P = NP avg , when the state of charge SOC needs to be adjusted N When the unbalanced weight is adjusted, the coefficient K1 is adjusted; when the power state SOP needs to be adjusted N When calculating the weight of the degree of imbalance, adjust the value coefficient K2.

[0091] The power at the output end of the secondary converter 241 corresponding to the battery module 261 is adjusted to the preset output power PN .

[0092] In this embodiment, the control unit of the energy storage device A can communicate with each other power unit of the energy storage device A to obtain the state of charge SOC of each battery module 261. N , Power State SOP N And other parameter information, and obtain the preset output power P according to the above parameter information N When the energy storage device A supplies power to the secondary conversion unit only through the battery unit, all the secondary converters in the secondary conversion unit are adjusted for output power according to the above steps, so that the battery units corresponding to the secondary conversion units tend to a balanced state, thereby increasing the service life of the battery units in the power supply system.

[0093] like Figure 3 As shown, in this embodiment, the power supply system also includes a data center energy management system connected to the low-voltage load unit 3, and the data center energy management system can be connected to the control units of the power supply device A and the power supply device B respectively, determine the control instructions according to the preset constraints, and the respective units of the power supply device A and the power supply device B execute the corresponding instructions.

[0094] In summary, the power supply control method provided by the present invention can realize the uninterruptible power supply function by utilizing the energy storage power supply device of the power supply system, and ensure the reliability of power supply to the low-voltage load unit when all the power supplies of the power supply system are powered off. The power supply control system using the power supply control method provided by the present invention does not need to set up a UPS device, but sets a battery unit in the power conversion module of at least one power supply device of the power supply control system, so that the low-voltage load unit can be powered when all the power supplies in the power supply system are in a power-off state. The battery unit of the power supply device, as a part of the power conversion module, can improve the utilization rate of the site where the power supply system is set up. The power supply device of the power supply system controlled by the power supply method provided by the present invention can realize the voltage reduction function through the battery unit and directly supply power to the secondary conversion unit. Therefore, the power supply system reduces the number of conversion units compared to the traditional UPS device. The power supply control method provided by the present invention can improve the loop efficiency of the power supply device including the battery unit, and its construction cost and use cost are low.

[0095] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A power supply control method, characterized in that: The power supply control method is used to control a power supply system, the power supply system is used to supply power to a low-voltage load unit, the power supply system includes at least one power supply and a power supply device arranged in a one-to-one correspondence with the power supply, the power supply device is connected to the corresponding power supply, and the power supply device includes a power conversion module; wherein at least one power conversion module of the power supply device includes a battery unit; The power supply control method comprises the following steps: in at least one power supply device, a power supply device including a power conversion module and a battery unit is used as an energy storage power supply device to determine whether all power supplies are in a power-off state; if so, the energy storage power supply device supplies power to the low-voltage load unit; if not, the power supply in the power supply state and the corresponding power supply device supply power to the low-voltage load unit.

2. The power supply control method according to claim 1, characterized in that: In the energy storage and power supply device, the power conversion module also includes a primary conversion unit and a secondary conversion unit, the input end of the primary conversion unit is connected to the power supply, the output end of the secondary conversion unit is connected to the battery unit, and the secondary conversion unit includes a secondary converter.

3. The power supply control method according to claim 2, characterized in that: The step further includes: in the energy storage and power supply device, obtaining the state of charge SOC of the battery module in the battery unit N , Power State SOP N , and obtain the average state of charge SOC of the battery cell avg and average power state SOP avg , according to the following formula to obtain the preset output power P N : Among them, K1 and K2 are value coefficients, P avg is the average value of the output powers of all secondary converters in the secondary conversion unit corresponding to the battery unit; The power at the output end of the secondary converter corresponding to the battery module is adjusted to the preset output power P N .

4. The power supply control method according to claim 3, characterized in that: The value range of the coefficient K1 is The value range of the coefficient K2 is SOC max is the maximum state of charge, SOC min is the minimum state of charge, SOP max For maximum power state, SOP min The minimum power state.

5. The power supply control method according to claim 3, characterized in that: When it is necessary to adjust the state of charge SOC N When the unbalanced weight is adjusted, the value coefficient K1 is adjusted; when the power state SOP needs to be adjusted N The weight of the imbalance degree is used to adjust the value coefficient K2.

6. The power supply control method according to claim 3, characterized in that: The energy storage and power supply device also includes a control unit, which obtains the state of charge (SOC) of each battery module. N , Power State SOP N , and according to the state of charge SOC N , the power state SOP N To obtain the preset output power P N .

7. The power supply control method according to claim 2, characterized in that: The battery unit includes a battery switch and a plurality of battery modules connected in series, the secondary converter includes a first input port and a second input port, the plurality of battery modules are arranged in a one-to-one correspondence with the plurality of secondary converters, the first input port of the secondary converter is connected to one end of the corresponding battery module, a first switch is arranged between the first input port of the secondary converter and one end of the corresponding battery module, the second input port of the secondary converter is connected to the other end of the corresponding battery module, and a second switch is arranged between the second input port of the secondary converter and the other end of the corresponding battery module; the plurality of secondary converters are arranged in sequence, between two adjacent secondary converters, the second input port of one of the secondary converters is connected to the first input port of another of the secondary converters, and a series switch is arranged between the second input port of one of the secondary converters and the first input port of another of the secondary converters.

8. The power supply control method according to claim 2, characterized in that: When all power supplies are in a power-off state, the secondary conversion unit is powered only by the battery unit of the energy storage power supply device.

9. The power supply control method according to claim 8, characterized in that: In the energy storage and power supply device, when the secondary conversion unit is powered only by the battery unit, output power adjustment is performed on all secondary converters in the secondary conversion unit.

10. The power supply control method according to claim 2, characterized in that: In the energy storage and power supply device, when the power supply corresponding to the energy storage and power supply device is in a power supply state, the primary conversion unit and the battery unit jointly supply power to the secondary conversion unit.

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