Power supply system

Abstract

The invention relates to the technical field of power supply systems, in particular to a power supply system which is based on hardware design, supports power supply for various loads with different power supply voltage levels and realizes 2N power redundancy for each load. An automatic transfer switching device is connected with a power supply and is connected with an AC / DC (alternating current / direct current) through two power supply paths, the AC / DC is connected with two multi-stage DC / DC, the AC / DC and a DC / DC unit of each stage in the multi-stage DC / DC are connected with a power supply port, power can be supplied to various loads with different power supply voltage grades, and each type of load port comprises two power supply channels with distributable power. And a UPS function is replaced, and 2N power redundancy is realized for each load.

Description

[0001] This case is a divisional application based on the invention patent with application date of September 29, 2024, application number 202411364949.X, and name “A method and device for controlling a power supply system” as the parent case. Technical Field

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

[0003] The rise of the digital economy and AI technology has led to the large-scale construction of digital infrastructure such as data centers and computing centers (hereinafter referred to as "data centers").

[0004] The power supply system is an important part of the data center. At present, the power supply system has the characteristics of load diversification, with different power supply voltage levels and characteristics. The load consists of IT load, power load such as air conditioning and refrigeration, power supply and distribution system load, and other auxiliary equipment load. With the improvement of energy efficiency index requirements, the proportion of IT load in the total load has gradually increased and become the main load. Due to the AC voltage equivalence of the traditional UPS architecture, IT equipment needs to be converted to low voltage after AC 220V or DC 300-400V to supply the server; the variable frequency compressor of the power load can be powered by AC, and some can be powered by DC, and different voltages are also used according to different power levels; the power supply and distribution load generally uses 220V / 380V AC, and DC power supply is also used in some all-DC electrical systems; auxiliary equipment loads include lighting, fire protection, etc., and the power supply design is relatively flexible. Load diversification has put forward higher requirements on the adaptability and performance of the power supply system devices in the data center. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method and device for controlling a power supply system, which can simultaneously support the supply of power to loads with multiple different power supply voltage levels through a power supply system.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A method for controlling a power supply system is based on a power supply system, wherein the power supply system includes a controller, an automatic transfer switch, two AC / DC units, two multi-level DC / DCs, and a plurality of power supply ports;

[0008] The automatic transfer switch is used to connect to at least two power distribution networks and a backup power supply, and output two power supply paths to be connected to two AC / DC units respectively;

[0009] The output ends of the two AC / DC units are connected in series to one multi-stage DC / DC and connected to a power supply port;

[0010] The multi-level DC / DC includes three levels of DC / DC units;

[0011] The output ends of the two AC / DC units are connected to the external battery connection port;

[0012] In the two multi-level DC / DCs, the first-level DC / DC unit is connected to the dual power supply port of the first voltage level load, the second-level DC / DC unit is connected to the dual power supply port of the second voltage level load, and the third-level DC / DC unit is connected to the dual power supply port of the third voltage level load;

[0013] In the two multi-level DC / DCs, each level of the DC / DC unit is connected to a power supply port;

[0014] And the implementation includes the following control steps:

[0015] Acquire the connection status of the automatic transfer switch electrical appliance with the power distribution network and the backup power supply, obtain power access information, and determine the voltages of the two power supply paths of the automatic transfer switch electrical appliance according to the power access information;

[0016] Controlling the output voltages of the two AC / DC units and each level of the DC / DC units in two multi-level DC / DCs according to the power access information and the connection status of each power supply port;

[0017] The determination of the output voltages of the two AC / DC units comprises:

[0018] If the external battery connection port is not connected to an external battery, the output voltage U DC_A and U DC_B for:

[0019]

[0020] Among them, S 1 and S 2 is the capacity of the two distribution networks, k 1 is the coefficient, U Bus1_min and U Bus1_max are the minimum and maximum values ​​of the total voltage range;

[0021] If the external battery connection port is connected to an external battery, the output voltage U of the two AC / DC units DC_A and U DC_B for:

[0022] |U DC_A |=U BAT_A ;

[0023] |U DC_B |=U BAT_B ;

[0024] Among them, U BAT_A and U BAT_B is the battery voltage;

[0025] Control the output current I of the two AC / DC units DC_A and I DC_B for:

[0026] I DC_A (t+1)=[(P DC1_A (t)+P DC2_A (t)+P DC3_A (t))-k 2_A (t)P BAT_A ] /

[0027] |U DC_A (t)|;

[0028] I DC_B (t+1)=[(P DC1_B (t)+P DC2_B (t)+P DC3_B (t))-k 2_B (t)P BAT_B ] /

[0029] |U DC_B (t)|;

[0030] Among them, k 2_A (t) and k 2_B (t) represents the battery participation at time t. When the battery participation is positive, it means the battery is discharging. When the battery participation is negative, it means the battery is charging. BAT_A and P BAT_B Indicates the rated power of the battery, P DC1_A (t) and P DC1_B (t) represents the output power of the first-stage DC / DC unit of the two-way multi-stage DC / DC at time t, P DC2_A (t) and P DC2_B (t) represents the output power of the second-stage DC / DC unit of the two-way multi-stage DC / DC at time t, P DC3_A (t) and P DC3_B (t) represents the output power of the third-stage DC / DC unit of the two-way multi-stage DC / DC at time t.

[0031] In order to solve the above technical problems, another technical solution adopted by the present invention is:

[0032] A power supply system, comprising a controller, an automatic switching device, two AC / DC units, two multi-level DC / DCs and a plurality of power supply ports;

[0033] The automatic transfer switch is used to connect to at least two power distribution networks and a backup power supply, and output two power supply paths to be connected to two AC / DC units respectively;

[0034] The output ends of the two AC / DC units are connected in series to one multi-stage DC / DC and connected to a power supply port;

[0035] In the two multi-level DC / DCs, each level of the DC / DC unit is connected to a power supply port;

[0036] And the steps in the above-mentioned method for controlling a power supply system are implemented through the controller.

[0037] The beneficial effects of the present invention are as follows: a method and device for controlling a power supply system of the present invention, based on hardware design, can adjust the power supply power of two channels of each power supply port in real time according to information such as different distribution network capacities through a power allocation strategy, thereby realizing multi-level voltage control and power distribution, thereby optimizing the overall efficiency, balancing the power consumption of equipment, and improving the service life; supporting power supply for loads of various power supply voltage levels, and including two power-allocatable power supply channels for each type of load port, thereby replacing the UPS function and realizing 2N power redundancy for each load. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a structural example diagram of a power supply system according to an embodiment of the present invention;

[0039] Figure 2 A flow chart of a method for controlling a power supply system according to an embodiment of the present invention;

[0040] Figure 3 A structural diagram of a device for controlling a power supply system according to an embodiment of the present invention;

[0041] Description of labels:

[0042] 1. A device for controlling a power supply system; 2. A processor; 3. A memory. DETAILED DESCRIPTION

[0043] 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.

[0044] Please refer to Figure 1, a power supply system, including an automatic transfer switch, two AC / DC units, two multi-level DC / DCs and a plurality of power supply ports;

[0045] The automatic transfer switch is used to connect to at least two power distribution networks and a backup power supply, and output two power supply paths to be connected to two AC / DC units respectively;

[0046] The output ends of the two AC / DC units are connected in series to one multi-stage DC / DC and connected to a power supply port;

[0047] In the two multi-level DC / DCs, each level of the DC / DC unit is connected to a power supply port.

[0048] From the above description, it can be seen that the beneficial effects of the present invention are: a method and device for controlling a power supply system of the present invention, in which an automatic switching switch is connected to the power supply, and the AC / DC is connected through two power supply paths, and the AC / DC is connected to two multi-level DC / DCs, and the DC / DC units of each level in the AC / DC and the multi-level DC / DC are connected to the power supply port, which can support power supply for loads of various power supply voltage levels, and each type of load port includes two power-distributable power supply channels, which replaces the UPS function and realizes 2N power redundancy for each load.

[0049] Furthermore, a common neutral line is provided between the two AC / DC units and between the two DC / DC units of the same level in the two multi-level DC / DCs;

[0050] Different electrodes of the two AC / DC units are connected to the neutral line, and connected to different electrodes of the two multi-level DC / DCs through the neutral line;

[0051] Different electrodes of two DC / DC units of the same level in two multi-level DC / DCs are connected to the neutral line, and are connected to different electrodes of the DC / DC unit of the next level through the neutral line.

[0052] From the above description, it can be seen that a neutral line shared by two power supply routes is designed, which reduces one power transmission line for two-channel power supply to each power supply port, reduces costs and improves power supply reliability and efficiency.

[0053] Further, the multi-level DC / DC includes three levels of DC / DC units;

[0054] The output ends of the two AC / DC units are connected to the external battery connection port;

[0055] In the two multi-level DC / DCs, the first-level DC / DC unit is connected to the dual power supply port of the first voltage level load, the second-level DC / DC unit is connected to the dual power supply port of the second voltage level load, and the third-level DC / DC unit is connected to the dual power supply port of the third voltage level load.

[0056] From the above description, it can be seen that the AC / DC unit is connected to the external battery connection port to connect the external battery. The external battery can reduce the risk of thermal runaway of the system. At the same time, based on the three-level DC / DC unit, it supports three voltage levels of power supply ports, which can match the power load, IT load, and low-voltage 48V load power requirements, effectively reducing the footprint of the data center wiring system and increasing site utilization.

[0057] Furthermore, each of the AC / DC units is obtained by connecting a plurality of AC / DC modules in parallel, and each of the DC / DC units is obtained by connecting a plurality of DC / DC modules in parallel.

[0058] From the above description, it can be seen that both the AC / DC unit and the DC / DC unit adopt a modular design to achieve sub-unit N+X redundancy, making the overall power supply reliability higher.

[0059] Please refer to Figure 2 , a method for controlling a power supply system, based on a power supply system, the power supply system includes a controller, an automatic transfer switch, two AC / DC units, two multi-level DC / DCs and a plurality of power supply ports;

[0060] The automatic transfer switch is used to connect to at least two power distribution networks and a backup power supply, and output two power supply paths to be connected to two AC / DC units respectively;

[0061] The output ends of the two AC / DC units are connected in series to one multi-stage DC / DC and connected to a power supply port;

[0062] In the two multi-level DC / DCs, each level of the DC / DC unit is connected to a power supply port;

[0063] And the implementation includes the following control steps:

[0064] Acquire the connection status of the automatic transfer switch electrical appliance with the power distribution network and the backup power supply, obtain power access information, and determine the voltages of the two power supply paths of the automatic transfer switch electrical appliance according to the power access information;

[0065] According to the power access information and the connection status of each of the power supply ports, the output voltages of the two AC / DC units and the DC / DC units at each level in the two multi-level DC / DCs are controlled.

[0066] From the above description, it can be seen that the beneficial effects of the present invention are: a method for controlling a power supply system of the present invention is based on a power supply system, in which an automatic switching switch is connected to the power supply, and AC / DC is connected through two power supply paths, and two multi-level DC / DCs are connected by AC / DC, and the DC / DC units of each level in the AC / DC and multi-level DC / DC are connected to the power supply port, which can support power supply for loads of various different power supply voltage levels, and each type of load port includes two power supply channels with power distribution, which replaces the UPS function and realizes 2N power redundancy for each load. At the same time, based on the control method, the power supply power of the two channels of each power supply port can be adjusted in real time according to information such as different distribution network capacities through a power distribution strategy, so as to realize multi-level voltage control and power distribution, thereby optimizing the overall efficiency, balancing the power consumption of the equipment, and improving the service life.

[0067] Further, determining the voltages of the two power supply paths of the automatic transfer switch electrical appliance according to the power supply access information includes:

[0068]

[0069] Among them, U in_1 and U in_2 Represents the input voltage of the two distribution networks, U in_d Indicates the input voltage of the backup power supply, U A and U B Respectively represent the voltages of the two power supply paths.

[0070] From the above description, it can be seen that the three AC input ports are converted into two power supply paths through the ATSE unit in the power distribution device, among which the voltage of the power supply path is preferentially provided according to the voltage of the distribution network. Only when the distribution network is not connected / cannot be used, the generator input voltage is used as the voltage of the two power supply paths.

[0071] Further, the determination of the output voltages of the two AC / DC units includes:

[0072] If the external battery connection port is not connected to an external battery, the output voltage U DC_A and U DC_B for:

[0073]

[0074] Among them, S 1 and S 2 is the capacity of the two distribution networks, k 1 is the coefficient, U Bus1_min and U Bus1_max are the minimum and maximum values ​​of the total voltage range.

[0075] From the above description, it can be seen that when the external battery connection port is not connected to a battery, the two AC / DC units are controlled to be in a constant voltage and current limiting working mode, and the output voltage is determined according to the power supply conditions and capacity ratio of the AC distribution network, as well as the total voltage range conditions.

[0076] Further, the determination of the output voltages of the two AC / DC units includes:

[0077] If the external battery connection port is connected to an external battery, the output voltage U of the two AC / DC units DC_A and U DC_B for:

[0078] |U DC_A |=U BAT_A ;

[0079] |U DC_B |=U BAT_B ;

[0080] Among them, U BAT_A and U BAT_B is the battery voltage;

[0081] Control the output current I of the two AC / DC units DC_A and I DC_B for:

[0082] I DC_A (t+1)=[(P DC1_A (t)+P DC2_A (t)+P DC3_A (t))-k 2_A (t)P BAT_A ] /

[0083] |U DC_A (t)|;

[0084] I DC_B (t+1)=[(P DC1_B (t)+P DC2_B (t)+P DC3_B (t))-k 2_B (t)P BAT_B ] /

[0085] |U DC_B (t)|;

[0086] Among them, k 2_A (t) and k 2_B (t) represents the battery participation at time t. When the battery participation is positive, it means the battery is discharging. When the battery participation is negative, it means the battery is charging. BAT_A and PBAT_B Indicates the rated power of the battery, P DC1_A (t) and P DC1_B (t) represents the output power of the first-stage DC / DC unit of the two-way multi-stage DC / DC at time t, P DC2_A (t) and P DC2_B (t) represents the output power of the second-stage DC / DC unit of the two-way multi-stage DC / DC at time t, P DC3_A (t) and P DC3_B (t) represents the output power of the third-stage DC / DC unit of the two-way multi-stage DC / DC at time t.

[0087] From the above description, it can be seen that when the external battery connection port is connected to the battery and the distribution network at the same time, the battery and the distribution network can simultaneously send power to the U DC_A and U DC_B Power supply, there is power distribution: the output voltage of the two AC / DC units is determined according to the voltage of the connected battery, and the two output currents at the next control moment are determined according to the total output power of all subsequent ports and the degree of battery power participation to achieve power distribution.

[0088] Furthermore, the output voltage of each DC / DC unit in the two-way multi-level DC / DC is determined by:

[0089] Determination of the output voltage of each stage of the DC / DC unit in the two-way multi-level DC / DC:

[0090]

[0091] U DCi_avg (t) = [U DCi_A (t)+U DCi_B (t)] / 2;

[0092] Among them, P i_A (t) and P i_B (t) represents the output power of the i-th level DC / DC unit in the two DC / DCs at time t, k 4_A and k 4_B represents the control coefficient, U DCi_A_ref (t+1) and U DCi_B_ref (t+1) represents the output voltage control setting value of the DC / DC unit at the i-th level in the two-way multi-level DC / DC at time t+1, U DC_A (t) and U DC_B (t) represents the output voltage of the two AC / DC units at time t.

[0093] It can be seen from the above description that for each DC / DC unit of a two-way multi-level DC / DC, when two ways are powered at the same time, the purpose of controlling the output power is achieved by controlling the output voltage of one way.

[0094] Furthermore, the output power of each stage of the DC / DC unit in the two-way multi-stage DC / DC is determined by:

[0095]

[0096] Among them, P DC1_A_ref (t+1) and P DC1_B_ref (t+1) represents the output power setting value of the two first-level DC / DC units corresponding to the dual power supply port of the first voltage level load at time t+1, U DC_A (t) and U DC_B (t) represents the output voltage of the two AC / DC units at time t, P DC2_A_ref (t+1) and P DC2_B_ref (t+1) represents the output power setting value of the two second-level DC / DC units corresponding to the dual power supply port of the second voltage level load at time t+1, U DC1_A (t) and U DC1_B (t) represents the output power of the first-stage DC / DC unit at time t, k 3_1 and k 3_2 Indicates the preset coefficient.

[0097] It can be seen from the above description that the output power ratio setting value of each DC / DC unit of the two-way multi-level DC / DC takes the output voltage ratio of the previous unit at the previous moment as a reference value.

[0098] A method and device for controlling a power supply system of the present invention are suitable for designing and controlling a power supply system, and are particularly suitable for designing and controlling a power supply system of a data center.

[0099] Please refer to Figure 1 , Embodiment 1 of the present invention is:

[0100] A power supply system, comprising a control device, an automatic transfer switch, two AC / DC units, two multi-level DC / DCs and a plurality of power supply ports;

[0101] The automatic transfer switch is used to connect to at least two power distribution networks and a backup power supply, and output two power supply paths to be connected to two AC / DC units respectively.

[0102] It can be seen that the input end of the power supply system has three or more AC input ports, two or more of which are connected to different AC distribution networks, and one or more of which are connected to an AC backup power supply, which may be a generator.

[0103] Three or more AC input ports are low-voltage power distribution below 1000Vac or other voltage level power distribution, and are matched with the subsequent units.

[0104] The two ports connected to the AC distribution network and the port connected to the backup power supply meet 2N+1 power redundancy for loads at each voltage level.

[0105] Please refer to Figure 1 In this embodiment, the ATSE unit is connected to two AC distribution networks and a generator. The three AC input ports are converted into two power supply paths, power supply path A and power supply path B, through the ATSE unit (i.e., automatic transfer switching device) in the power supply system.

[0106] The two power supply paths are respectively connected to different AC / DC units A and AC / DC units B.

[0107] In this embodiment, the input and output of the AC / DC unit are electrically isolated; the DC output of the AC / DC unit has two working modes: constant voltage and current limiting (voltage source) and constant current and voltage limiting (current source); the AC / DC unit has external communication, and the working mode and operating parameters can be controlled by an internal or external controller, and status information can be read.

[0108] Each of the AC / DC units is obtained by connecting a plurality of AC / DC modules in parallel;

[0109] A common neutral line is provided between the two AC / DC units and between the two DC / DC units of the same level in the two multi-level DC / DCs;

[0110] Different electrodes of the two AC / DC units are connected to the neutral line, and are connected to different electrodes of the two multi-level DC / DCs through the neutral line.

[0111] The output ends of the two AC / DC units are connected in series to one multi-stage DC / DC and are connected to a power supply port.

[0112] The output ends of the two AC / DC units are connected to an external battery connection port.

[0113] In this embodiment, refer to Figure 1The DC output negative pole of AC / DC unit A is connected to the DC output positive pole of AC / DC unit B to form the output intermediate pole DC_N. The outputs of AC / DC unit A and AC / DC unit B are respectively connected to the inputs of the first-stage DC / DC unit A and the first-stage DC / DC unit B in the multi-stage DC / DC, and the external battery connection port U BAT_A and U BAT_B And the common neutral line DC_N three lines realize the connection of two batteries.

[0114] The battery connected to the external battery connection port has the following functions:

[0115] Battery A and battery B may have the same or different design specifications, but each matches the output specifications of AC / DC unit A or AC / DC unit B.

[0116] The external battery connection port has an external communication line, and the operation of the AC / DC unit A and the AC / DC unit B can be controlled and the status information can be read by an internal or external controller.

[0117] In the two multi-level DC / DCs, each level of the DC / DC unit is connected to a power supply port;

[0118] Each of the DC / DC units is obtained by connecting a plurality of DC / DC modules in parallel;

[0119] Different electrodes of two DC / DC units of the same level in two multi-level DC / DCs are connected to the neutral line, and connected to different electrodes of the DC / DC unit of the next level through the neutral line;

[0120] The multi-level DC / DC includes three levels of DC / DC units;

[0121] In the two multi-level DC / DCs, the first-level DC / DC unit is connected to the dual power supply port of the first voltage level load, the second-level DC / DC unit is connected to the dual power supply port of the second voltage level load, and the third-level DC / DC unit is connected to the dual power supply port of the third voltage level load.

[0122] In this embodiment, refer to Figure 1 The output of the first-stage DC / DC unit is connected to the first voltage level load dual power supply port and the input of the second-stage DC / DC unit A and B. The two outputs of the first-stage DC / DC unit A and the first-stage DC / DC unit B have a common neutral line DC1_N. The output U DC1_A and the output U of the first stage DC / DC unit B DC1_B , with the same rated voltage and opposite polarity, sharing the output line DC1_N, and realizing two-way power supply through three lines.

[0123] U DC1_A with U DC1_B Achieve 2N redundant power supply to data center power loads.

[0124] Similarly, the output of the second-stage DC / DC unit is connected to the second voltage level load dual power supply port and the input of the third-stage DC / DC unit A and B. The second-stage DC / DC unit A and the second-stage DC / DC unit B have a common neutral line DC2_N, and two power supplies are realized through three lines.

[0125] Similarly, the third-level DC / DC unit realizes 2N redundant power supply to the 48V load based on the connection mode of three lines. The third-level DC / DC unit A and the third-level DC / DC unit B have a common neutral line DC3_N.

[0126] The AC / DC unit A / B and the first, second and third level DC / DC units A / B are all multi-modules connected in parallel, and the output power of the corresponding units achieves N+1 redundancy.

[0127] Please refer to Figure 2 , Embodiment 2 of the present invention is:

[0128] A method for controlling a power supply system is based on the power supply system described in the first embodiment above and includes the following steps:

[0129] Acquire the connection status of the automatic transfer switch electrical appliance with the power distribution network and the backup power supply, obtain power access information, and determine the voltages of the two power supply paths of the automatic transfer switch electrical appliance according to the power access information;

[0130] Specifically, determining the voltages of the two power supply paths of the automatic transfer switch electrical appliance according to the power supply access information includes:

[0131]

[0132] Among them, U in_1 and U in_2 Represents the input voltage of the two distribution networks, U in_d Indicates the input voltage of the backup power supply, U A and U B Respectively represent the voltages of the two power supply paths.

[0133] In this embodiment, the three AC input ports are converted into two power supply paths, power supply path A and power supply path B, through the ATSE unit in the power distribution device, and the above logic is realized. in_1 and U in_2 Represents the input voltage of two AC distribution networks, U in_dIndicates the input voltage of the diesel generator.

[0134] According to the power access information and the connection status of each of the power supply ports, the output voltages of the two AC / DC units and the DC / DC units at each level in the two multi-level DC / DCs are controlled.

[0135] The determination of the output voltages of the two AC / DC units comprises:

[0136] If the external battery connection port is not connected to an external battery, the output voltage U DC_A and U DC_B for:

[0137]

[0138] Among them, S 1 and S 2 is the capacity of the two distribution networks, k 1 is the coefficient, U Bus1_min and U Bus1_max are the minimum and maximum values ​​of the total voltage range.

[0139] In this embodiment, if the external battery connection port is not connected to a battery, the AC / DC unit A / B is controlled to operate in a constant voltage and current limiting mode. The output U of the AC / DC unit is determined according to the above conditions. DC_A and U DC_B The output voltage of the AC / DC unit A / B is determined according to the power supply conditions and capacity ratio of the AC distribution network, as well as the total voltage range conditions.

[0140] If the external battery connection port is connected to an external battery, the output voltage U of the two AC / DC units DC_A and U DC_B for:

[0141] |U DC_A |=U BAT_A ;

[0142] |U DC_B |=U BAT_B ;

[0143] Among them, U BAT_A and U BAT_B is the battery voltage.

[0144] The battery and the distribution network can simultaneously supply U DC_A and U DC_B Power supply, there is power distribution, control the output current I of the two AC / DC units DC_A and I DC_B for:

[0145] I DC_A (t+1)=[(P DC1_A (t)+P DC2_A (t)+P DC3_A (t))-k 2_A (t)P BAT_A ] /

[0146] |U DC_A (t)|;

[0147] I DC_B (t+1)=[(P DC1_B (t)+P DC2_B (t)+P DC3_B (t))-k 2_B (t)P BAT_B ] /

[0148] |U DC_B (t)|;

[0149] Among them, k 2_A (t) and k 2_B (t) represents the battery participation at time t. When the battery participation is positive, it means the battery is discharging. When the battery participation is negative, it means the battery is charging. BAT_A and P BAT_B Indicates the rated power of the battery, P DC1_A (t) and P DC1_B (t) represents the output power of the first-stage DC / DC unit of the two-way multi-stage DC / DC at time t, P DC2_A (t) and P DC2_B (t) represents the output power of the second-stage DC / DC unit of the two-way multi-stage DC / DC at time t, P DC3_A (t) and P DC3_B (t) represents the output power of the third-stage DC / DC unit of the two-way multi-stage DC / DC at time t.

[0150] In this embodiment, when the external battery connection port is connected to a battery and connected to a power distribution network at the same time, the output U of the AC / DC unit is determined according to the above conditions. DC_A and U DC_B The output voltage of the AC / DC unit A / B is determined according to the voltage of the connected battery, and the output current of the unit A / B at the next control moment is determined according to the total output power of all subsequent ports and the degree of battery power participation, thereby realizing power distribution.

[0151] The output power of each stage of the DC / DC unit in the two-way multi-stage DC / DC is determined by:

[0152]

[0153] Among them, P DC1_A_ref (t+1) and P DC1_B_ref (t+1) represents the output power setting value of the two first-level DC / DC units corresponding to the dual power supply port of the first voltage level load at time t+1, U DC_A (t) and U DC_B (t) represents the output voltage of the two AC / DC units at time t, P DC2_A_ref (t+1) and P DC2_B_ref (t+1) represents the output power setting value of the two second-level DC / DC units corresponding to the dual power supply port of the second voltage level load at time t+1, U DC1_A (t) and U DC1_B (t) represents the output power of the first-stage DC / DC unit at time t, k 3_1 and k 3_2 Indicates the preset coefficient.

[0154] In this embodiment, the two-way output power ratio setting value of each level of DC / DC unit A / B is based on the output voltage ratio of the previous level unit at the previous moment as a reference value, as shown above. For each level of DC / DC unit A / B, when A / B is powered at the same time, the output power is controlled by controlling the output voltage of a certain path, and the determination of the control set value is as follows.

[0155] Determining the output voltage of each stage of the DC / DC unit in the two-way multi-stage DC / DC includes:

[0156] Determination of the output voltage of each stage of the DC / DC unit in the two-way multi-level DC / DC:

[0157]

[0158] U DCi_avg (t) = [U DCi_A (t)+U DCi_B (t)] / 2;

[0159] Among them, P i_A (t) and P i_B (t) represents the output power of the i-th level DC / DC unit in the two DC / DCs at time t, k 4_A and k 4_B represents the control coefficient, U DCi_A_ref (t+1) and U DCi_B_ref (t+1) represents the output voltage control setting value of the DC / DC unit at the i-th level in the two-way multi-level DC / DC at time t+1, U DC_A (t) and U DC_B (t) represents the output voltage of the two AC / DC units at time t.

[0160] The power supply system described in the first embodiment also includes a control device, which communicates with the AC / DC unit A / B, each level of AC / DC unit A / B and the battery to implement the above control method.

[0161] Please refer to Figure 3 , Embodiment 3 of the present invention is:

[0162] A device 1 for controlling a power supply system comprises a processor 2, a memory 3 and a computer program stored in the memory 3 and executable on the processor, wherein the computer program, when executed, implements the steps in a method for controlling a power supply system described in the second embodiment above.

[0163] In summary, the present invention provides a method and device for controlling a power supply system, in which an automatic switching switch is connected to the power supply, and the AC / DC is connected through two power supply paths, and the AC / DC is connected to two multi-level DC / DCs, and the DC / DC units of each level in the AC / DC and the multi-level DC / DC are connected to the power supply port, which can support power supply for loads of various power supply voltage levels, and each type of load port includes two power distribution channels, which replaces the UPS function and realizes 2N power redundancy for each load. At the same time, based on the control method, the power supply power of the two channels of each power supply port can be adjusted in real time through the power distribution strategy according to information such as different distribution network capacities, so that the overall efficiency can be optimized, the power consumption of the equipment can be balanced, and the service life can be improved.

[0164] That is, the present invention has the following beneficial effects:

[0165] Through an integrated power supply system, power supply can be provided to data centers, supercomputing centers, intelligent computing centers, etc., including power loads, IT loads, and low-voltage 48V loads. This reduces the area occupied by the data center wiring system and increases site utilization;

[0166] It has the function of external battery access to achieve energy storage, reduce the overall PUE of the power supply system, and improve economic benefits.

[0167] Each load port has two power distribution channels, which can replace the UPS function and realize 2N power redundancy for each load.

[0168] Each power unit is modularized and has N+X redundancy, making the overall power supply more reliable.

[0169] External battery reduces the risk of system thermal runaway;

[0170] Two-channel power supply for each power supply port reduces one power transmission line, reduces costs and improves power supply reliability and efficiency.

[0171] According to the different distribution network capacities and the power status of the external battery, the two-channel power supply power of each power supply port is adjusted in real time through the power allocation strategy, which can optimize the overall efficiency, balance the power consumption of equipment and improve the service life.

[0172] The external battery is not limited to the same specification, and the power is dynamically allocated according to the connected power. It can be used as a peak and valley regulation power supply carrier, or as a backup power emergency to provide support for the diesel generator start-up.

[0173] 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 system, characterized in that: It includes a controller, an automatic transfer switch, two AC / DC units, two multi-level DC / DCs and multiple power supply ports; The automatic transfer switch is used to connect to at least two power distribution networks and at least one backup power supply, and output two power supply paths to be connected to two AC / DC units respectively; The output ends of the two AC / DC units are connected in series to one multi-stage DC / DC and connected to a power supply port; In the two multi-level DC / DCs, each level of the DC / DC unit is connected to a power supply port.

2. A power supply system according to claim 1, characterized in that: A common neutral line is provided between the two AC / DC units and between the two DC / DC units of the same level in the two multi-level DC / DCs; Different electrodes of the two AC / DC units are connected to the neutral line, and connected to different electrodes of the two multi-level DC / DCs through the neutral line; Different electrodes of two DC / DC units of the same level in two multi-level DC / DCs are connected to the neutral line, and are connected to different electrodes of the DC / DC unit of the next level through the neutral line.

3. A power supply system according to claim 1, characterized in that: The multi-level DC / DC includes three levels of DC / DC units; The output ends of the two AC / DC units are connected to the external battery connection port; In the two multi-level DC / DCs, the first-level DC / DC unit is connected to the dual power supply port of the first voltage level load, the second-level DC / DC unit is connected to the dual power supply port of the second voltage level load, and the third-level DC / DC unit is connected to the dual power supply port of the third voltage level load.

4. A power supply system according to claim 1, characterized in that: Each of the AC / DC units is obtained by connecting a plurality of AC / DC modules in parallel, and each of the DC / DC units is obtained by connecting a plurality of DC / DC modules in parallel.

5. A power supply system according to claim 1, characterized in that: The implementation includes the following control steps: Acquire the connection status of the automatic transfer switch electrical appliance with the power distribution network and the backup power supply, obtain power access information, and determine the voltages of the two power supply paths of the automatic transfer switch electrical appliance according to the power access information; According to the power access information and the connection status of each of the power supply ports, the output voltages of the two AC / DC units and the DC / DC units at each level in the two multi-level DC / DCs are controlled, including: determining the output voltage of the AC / DC unit A / B according to the voltage of the connected battery, and determining the output current of the unit A / B at the next control moment according to the total output power of all subsequent ports and the battery power participation degree, so as to realize power distribution.

6. The power control method of a power supply system according to claim 5, characterized in that: Determining the voltages of two power supply paths of the automatic transfer switch electrical appliance according to the power supply access information includes: Among them, U in_1 and U in_2 Represents the input voltage of the two distribution networks, U IN_D Indicates the input voltage of the backup power supply, U A and U B Respectively represent the voltages of the two power supply paths.

7. The power control method of a power supply system according to claim 5, characterized in that: The determination of the output voltages of the two AC / DC units comprises: If the external battery connection port is not connected to an external battery, the output voltage U DC_A and U DC_B for: Among them, S1 and S2 are the distribution network capacities of the two distribution networks, k1 is the coefficient, and are the minimum and maximum values ​​of the total voltage range.

8. The power control method of a power supply system according to claim 5, characterized in that: The determination of the output voltages of the two AC / DC units comprises: If the external battery connection port is connected to an external battery, the output voltage U of the two AC / DC units DCA and U DCB for: |In DC_A |=U BAT_A ; |In DC_B |=U BAT_B ; Among them, U BAT_A and U BAT_B is the battery voltage; Control the output current I of the two AC / DC units DC_A and I DC_B for: I DC_A (t+1)=[(P DC1_A (t)+P DC2_A (t)+P DC3_A (t))-k 2_A (t)P BAT_A ] / |U DC_A (t)|; I DC_B (t+1)=[(P DC1_B (t)+P DC2_B (t)+P DC3_B (t))-k 2_B (t)P BAT_B ] / |U DC_B (t)|; Among them, k 2_A and k 2_B Indicates the battery participation. When the battery participation is positive, it means the battery is discharging. When the battery participation is negative, it means the battery is charging. BAT_A and P BAT_B Indicates the rated power of the battery, P DC1_A and P DC1_B Represents the output power of the first-stage DC / DC unit of a two-way multi-stage DC / DC, P DC2_A and P DC2_B Represents the output power of the second-stage DC / DC unit of the two-way multi-stage DC / DC, P DC3_A and P DC3_B Indicates the output power of the third-stage DC / DC unit of a two-way multi-stage DC / DC.

9. The power control method of a power supply system according to claim 5, characterized in that: Determining the output voltage of each stage of the DC / DC unit in the two-way multi-stage DC / DC includes: Determination of the output voltage of each stage of the DC / DC unit in the two-way multi-level DC / DC: Among them, P i_A and P i_B They represent the output power of the DC / DC unit at the i-th level in the two DC / DCs, respectively, and k 4_A and k 4_B represents the control coefficient, U DCi_A_ref (t+1) and U DCi_B_ref (t+1) represents the output voltage control setting value of the DC / DC unit at the i-th level in the two-way multi-level DC / DC at time t+1, U DC_A and U DC_B represents the output voltage of the two AC / DC units.

10. The power control method of a power supply system according to claim 5, characterized in that: A power control method for a power supply system, characterized in that the output power of each stage of the DC / DC unit in two multi-stage DC / DCs is determined by: Among them, P DC1_A_ref (t+1) and P DC1_B_ref (t+1) represents the output power setting value of the two first-level DC / DC units corresponding to the dual power supply port of the first voltage level load at time t+1, U DC_A (t) and U DC_B (t) represents the output voltage of the two AC / DC units at time t, P DC2_A_ref (t+1) and P DC2_B_ref (t+1) represents the output power setting value of the two second-level DC / DC units corresponding to the dual power supply port of the second voltage level load at time t+1, U DC1_A (t) and U DC1_B (t) represents the output power of the first-stage DC / DC unit at time t, k 3_1 and k 3_2 Indicates the preset coefficient.

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