Multi-port medium-voltage direct-hanging data center power supply system

Abstract

The invention discloses a multi-port medium-voltage direct-hanging data center power supply system, which is characterized in that the input sides of M power modules are connected in series into a 10kV power grid, and each module integrates N groups of parallel DC / DC converter groups corresponding to N output branches respectively, so that flexible power distribution is realized; a dynamic efficiency optimization mechanism is provided, the number of DC / DC converters input into each port is dynamically adjusted through an algorithm based on the load power requirement and the optimal efficiency point of the single converter, an optimal configuration matrix is generated, and the system is made to operate in an efficient interval all the time; when a certain branch is short-circuited, the corresponding converter group is automatically locked to ensure that other branches continuously supply power; the system has expansibility, adapts to different voltage levels by increasing or decreasing the number of modules connected in series, or meets the requirement for larger loads by expanding parallel branches. According to the multi-port medium-voltage direct-hanging data center power supply system, multi-path parallel output can be provided, flexible power supply is achieved, the efficiency under different loads is optimized, and high reliability of multi-path output is ensured.

Description

Technical Field

[0001] The present invention belongs to the field of power electronic transformers and relates to a power supply system, in particular to a multi-port medium-voltage direct-mounted data center power supply system. Background Art

[0002] As global digitalization accelerates, data centers, as core infrastructure supporting technologies such as cloud computing, artificial intelligence, and the Internet of Things, are experiencing increasing energy demands. In recent years, data center electricity consumption has steadily increased as a percentage of global electricity consumption. Improving power supply efficiency, ensuring reliability, and adapting to green and low-carbon development trends have become key challenges facing the data center sector. Traditional AC power supply architectures require multiple stages of transformation and AC / DC conversion, resulting in significant efficiency losses and failing to meet the high-density, high-reliability, and flexible scalability requirements of data centers. Against this backdrop, medium-voltage direct-hung DC power supply technology has become a research hotspot due to its potential to reduce power conversion steps and improve system efficiency. However, existing medium-voltage direct-hung power supply systems lack flexibility and redundancy, making them unable to meet the efficiency and reliability requirements of data centers. CN115066818A proposed a power supply system with flexible power supply capabilities, but did not mention how to achieve high redundancy reliability; CN117614047A proposed a medium-voltage direct-mounted data center power supply system, but it only has one low-voltage DC bus and low redundancy reliability; CN115622220A proposed a power electronic transformer power supply unit with dual-channel output capability, which improves redundancy reliability, but the redundancy reliability needs to be further improved.

[0003] In summary, the multi-port medium-voltage direct-hung data center power supply system with flexible power supply, efficiency optimization and high reliability meets current needs. Summary of the Invention

[0004] In response to the above-mentioned deficiencies in the prior art, the present invention provides a multi-port medium-voltage direct-mounted data center power supply system with optimized efficiency, high reliability and flexible power supply. The power supply system is connected to the 10kV power grid in series on the input side of M power modules. Each module integrates N groups of parallel DC / DC converter groups corresponding to N output branches, respectively, to achieve flexible power distribution; a dynamic efficiency optimization mechanism is proposed, based on the load power demand and the optimal efficiency point of the single converter, the number of DC / DC converters put into each port is dynamically adjusted through an algorithm to generate an optimal configuration matrix, so that the system always operates in a high-efficiency range; when a branch is short-circuited, the corresponding converter group is automatically locked to ensure that the remaining branches continue to be powered; the system is scalable, and can adapt to different voltage levels by increasing or decreasing the number of series modules, or expand parallel branches to meet larger load requirements. The multi-port medium-voltage direct-mounted data center power supply system of the present invention can provide multiple parallel outputs, achieve flexible power supply, optimize efficiency under different loads, and ensure high reliability of multiple outputs.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A multi-port medium-voltage direct-mounted data center power supply system includes a medium-voltage distribution network, a power electronic transformer, and N low-voltage DC busbars, wherein:

[0007] The power electronic transformer includes M power modules, each of which includes one centralized AC / DC converter and N DC / DC converter groups. The input sides of the centralized AC / DC converters are connected in series, serving as input ports of the power electronic transformer and accepting a 10 kV AC voltage. The output side of the centralized AC / DC converter is connected to the N DC / DC converter groups. The input sides of the N DC / DC converter groups are connected in parallel and connected to the output side of the centralized AC / DC converter. The output sides of the N DC / DC converter groups are connected in parallel and respectively connected to N output ports, serving as output ends of the power electronic transformer. N and M are both integers greater than 1.

[0008] The output end of the medium-voltage distribution network is connected to the input end of the power electronic transformer, the N output ports of the power electronic transformer are respectively connected to the input ends of N low-voltage DC busbars, and the output ends of the N low-voltage DC busbars are respectively connected to N IT loads of the data center;

[0009] A battery is connected between the low-voltage DC bus and the corresponding IT load.

[0010] A method for optimizing the efficiency of the multi-port medium voltage direct-connected data center power supply system comprises the following steps:

[0011] Step 1 Calculate the minimum DC / DC converter group required for each port: Based on the load power P of each output port iAnd the single DC / DC converter's highest efficiency power P max , determine the minimum number of integer transformer groups per output port Satisfy N i >P i / P max , covering load demands and avoiding inefficient operation;

[0012] Step 2: According to the number of DC / DC converter groups required by each output port, add up the number of DC / DC converter groups for all output ports.

[0013] Step 3: Determine the number of power modules to be invested: Based on the total demand N sum And the total number of power modules M, calculate the number of DC / DC converter groups required for each power module k = N sum / M, where k≤N, that is, the output port load power is less than or equal to the total power of the N DC / DC converter group;

[0014] Step 4 Dynamically adjust demand: If there is a difference D = M × kN sum , according to the output port load margin Sort in descending order and add one converter group to each of the first D output ports; if the difference D is 0, no converter group needs to be added;

[0015] Step 5: Algorithm allocation of converter group number: Initialize the remaining demand array, select the input output port load margin from 1 to M module by module, frac i The largest first k output ports, and update the output port requirements until they are cleared to generate the configuration matrix C∈Z M×k , where C jl Indicates the status number of the lth DC / DC converter group of the jth power module, C jl 1 represents input, C j,l 0 means locked;

[0016] Step ⑥ Output configuration matrix: According to the configuration matrix C∈Z M×k , respectively put into operation or lock out the DC / DC converter group with the corresponding number.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. In the present invention, N output ports are connected to M parallel DC / DC converter groups. By flexibly switching the number j of DC / DC converters in the DC / DC converter group, flexible power supply can be achieved and efficiency optimization under different loads can be achieved, where 0≤j≤M.

[0019] 2. In the present invention, when a short circuit occurs on the i-th low-voltage DC bus among N low-voltage DC busbars, the i-th DC / DC converter group of all power modules connected to that busbar is locked and stops supplying power to the IT load i on the i-th low-voltage DC busbar. However, this does not affect the power modules in the other N-1 busbars, which can continue to supply power to the IT loads. This provides high reliability, where 1≤i≤N.

[0020] 3. In the present invention, the number of power modules of the power electronic transformer can be expanded, and the adaption to the medium-voltage distribution network with higher voltage level can be achieved by increasing the number M of power modules in series, or the power demand of larger-scale data centers can be met by increasing the number N of parallel DC / DC converter groups.

[0021] 4. The multi-port medium-voltage direct-mounted data center power supply system of the present invention has the characteristics of flexible power supply, efficiency optimization and high reliability, which effectively solves the problems of low power supply efficiency, poor reliability and difficulty in expansion in data centers, and is very suitable for data center power supply scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of a multi-port medium-voltage direct-hung data center power supply system.

[0023] Figure 2 Schematic diagram of a power electronic transformer.

[0024] Figure 3 Schematic diagram of the power module.

[0025] Figure 4 Schematic diagram of a centralized AC / DC converter.

[0026] Figure 5 Schematic diagram of a DC / DC converter.

[0027] Figure 6 Flowchart of the efficiency optimization mechanism. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below with reference to the accompanying drawings, but is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention that does not depart from the spirit and scope of the technical solution of the present invention should be included in the scope of protection of the present invention.

[0029] The present invention provides a multi-port medium voltage direct-mounted data center power supply system, such as Figures 1 to 3 As shown, the power supply system includes a medium voltage distribution network, a power electronic transformer, and N low voltage DC buses, wherein:

[0030] The power electronic transformer includes M power modules, each of which includes one centralized AC / DC converter and N DC / DC converter groups. The input sides of the centralized AC / DC converters are connected in series, serving as input ports of the power electronic transformer and accepting a 10 kV AC voltage. The output side of the centralized AC / DC converter is connected to the N DC / DC converter groups. The input sides of the N DC / DC converter groups are connected in parallel and connected to the output side of the centralized AC / DC converter. The output sides of the N DC / DC converter groups are connected in parallel and respectively connected to N output ports, serving as output ends of the power electronic transformer. N and M are both integers greater than 1.

[0031] The output end of the medium-voltage distribution network is connected to the input end of the power electronic transformer, the N output ports of the power electronic transformer are respectively connected to the input ends of N low-voltage DC busbars, and the output ends of the N low-voltage DC busbars are respectively connected to N IT loads of the data center;

[0032] A battery is connected between the low-voltage DC bus and the corresponding IT load.

[0033] In the present invention, Figure 4 As shown, the first port of the centralized AC / DC converter is the input side of the centralized AC / DC converter, the second port is the output side of the centralized AC / DC converter, and the first ports of the centralized AC / DC converters in the M power modules are connected in series.

[0034] In the present invention, the DC / DC converter group includes K DC / DC converters, wherein: the first port of each DC / DC converter is the input side of the DC / DC converter, and the second port is the output side of the DC / DC converter; the first ports of the K DC / DC converters are connected in parallel, and the second ports are connected in parallel; K is an integer greater than 1.

[0035] In the present invention, Figure 5 As shown, the DC / DC converter includes a high-frequency DC / AC converter, a high-frequency isolation transformer and a high-frequency AC / DC converter, wherein: the first port of the high-frequency DC / DC converter is connected in parallel with the second port of the centralized AC / DC converter, the second port of the high-frequency DC / AC converter is connected to the first port of the high-frequency isolation transformer, the second port of the high-frequency isolation transformer is connected to the first port of the high-frequency AC / DC converter, and the second port of the high-frequency AC / DC converter is connected in parallel with the output port.

[0036] In the present invention, the medium voltage distribution network is a 10kV AC distribution network.

[0037] The present invention also provides an efficiency optimization method for the above-mentioned multi-port medium voltage direct-connected data center power supply system, wherein N output ports are connected to N IT loads, and the power provided by the i-th output port is P i In order to achieve the highest efficiency of the whole machine, it is necessary to ensure that each output port is equipped with a minimum number of DC / DC converters, that is, to ensure that the power transmitted by the DC / DC converters is at the highest efficiency point. max , the rest of the DC / DC converters are in a locked state, and the number of DC / DC converters is adjusted to adjust the overall efficiency to achieve the maximum efficiency, where 1≤i≤N. Figure 6 As shown, the method includes the following steps:

[0038] Step 1 Calculate the minimum DC / DC converter group required for each port: Based on the load power P of each output port i And the single DC / DC converter's highest efficiency power P max , determine the minimum number of integer transformer groups per output port Satisfy N i >P i / P max , covering load demands and avoiding inefficient operation;

[0039] Step 2: According to the number of DC / DC converter groups required by each output port, add up the number of DC / DC converter groups for all output ports.

[0040] Step 3: Determine the number of power modules to be invested: Based on the total demand N sum And the total number of power modules M, calculate the number of DC / DC converter groups required for each power module k = N sum / M, where k≤N, that is, the output port load power is less than or equal to the total power of the N DC / DC converter group;

[0041] Step 4 Dynamically adjust demand: If there is a difference D = M × kN sum , according to the output port load margin Sort in descending order and add one converter group to each of the first D output ports; if the difference D is 0, no converter group needs to be added;

[0042] Step 5: Algorithm allocation of converter group number: Initialize the remaining demand array, select the input output port load margin from 1 to M module by module, frac i The largest first k output ports, and update the output port requirements until they are cleared to generate the configuration matrix C∈Z M×k , where C jl Indicates the status number of the lth DC / DC converter group of the jth power module, C jl 1 represents input, Cj,l 0 means locked;

[0043] Step ⑥ Output configuration matrix: According to the configuration matrix C∈Z M×k , respectively put into operation or lock out the DC / DC converter group with the corresponding number.

Claims

1. A multi-port medium voltage direct-mounted data center power supply system, characterized in that The power supply system includes a medium voltage distribution network, a power electronic transformer, and N low voltage DC busbars, wherein: The power electronic transformer includes M power modules, each of which includes one centralized AC / DC converter and N DC / DC converter groups. The input sides of the centralized AC / DC converters are connected in series, serving as input ports of the power electronic transformer and accepting a 10 kV AC voltage. The output side of the centralized AC / DC converter is connected to the N DC / DC converter groups. The input sides of the N DC / DC converter groups are connected in parallel and connected to the output side of the centralized AC / DC converter. The output sides of the N DC / DC converter groups are connected in parallel and respectively connected to N output ports, serving as output ends of the power electronic transformer. N and M are both integers greater than 1. The output end of the medium-voltage distribution network is connected to the input end of the power electronic transformer, the N output ports of the power electronic transformer are respectively connected to the input ends of N low-voltage DC busbars, and the output ends of the N low-voltage DC busbars are respectively connected to N IT loads of the data center; A battery is connected between the low-voltage DC bus and the corresponding IT load.

2. The multi-port medium voltage direct-mounted data center power supply system according to claim 1 is characterized in that The first port of the centralized AC / DC converter is the input side of the centralized AC / DC converter, the second port is the output side of the centralized AC / DC converter, and the first ports of the centralized AC / DC converters in the M power modules are connected in series.

3. The multi-port medium voltage direct-mounted data center power supply system according to claim 1 is characterized in that The DC / DC converter group includes K DC / DC converters, wherein: the first port of each DC / DC converter is the input side of the DC / DC converter, and the second port is the output side of the DC / DC converter; the first ports of the K DC / DC converters are connected in parallel, and the second ports are connected in parallel; K is an integer greater than 1.

4. The multi-port medium voltage direct-mounted data center power supply system according to claim 3 is characterized in that The DC / DC converter includes a high-frequency DC / AC converter, a high-frequency isolation transformer, and a high-frequency AC / DC converter, wherein: the first port of the high-frequency DC / DC converter is connected in parallel with the second port of the centralized AC / DC converter, the second port of the high-frequency DC / AC converter is connected to the first port of the high-frequency isolation transformer, the second port of the high-frequency isolation transformer is connected to the first port of the high-frequency AC / DC converter, and the second port of the high-frequency AC / DC converter is connected in parallel with the output port.

5. The multi-port medium voltage direct-mounted data center power supply system according to claim 1 is characterized in that The medium voltage distribution network is a 10kV AC distribution network.

6. An efficiency optimization method for a multi-port medium voltage direct-mounted data center power supply system according to any one of claims 1 to 5, characterized in that The method comprises the following steps: Step 1 Calculate the minimum DC / DC converter group required for each port: Based on the load power P of each output port i And the single DC / DC converter's highest efficiency power P max , determine the minimum number of integer transformer groups per output port Satisfy N i >P i / P max , covering load demands and avoiding inefficient operation; Step 2: According to the number of DC / DC converter groups required by each output port, add up the number of DC / DC converter groups for all output ports. Step 3: Determine the number of power modules to be invested: Based on the total demand N sum And the total number of power modules M, calculate the number of DC / DC converter groups required for each power module k = N sum / M, where k≤N, that is, the output port load power is less than or equal to the total power of the N DC / DC converter group; Step 4 Dynamically adjust demand: If there is a difference D = M × kN sum , according to the output port load margin Sort in descending order and add one converter group to each of the first D output ports; if the difference D is 0, no converter group needs to be added; Step 5: Algorithm allocation of converter group number: Initialize the remaining demand array, select the input output port load margin from 1 to M module by module, frac i The largest first k output ports, and update the output port requirements until they are cleared to generate the configuration matrix C∈Z M×k , where C jl Indicates the status number of the lth DC / DC converter group of the jth power module, C jl 1 represents input, C j,l 0 means locked; Step ⑥ Output configuration matrix: According to the configuration matrix C∈Z M×k , respectively put into operation or lock out the DC / DC converter group with the corresponding number.

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