CN116111708A

CN116111708A - Power supply system and power supply control method

Info

Publication number: CN116111708A
Application number: CN202211425867.2A
Authority: CN
Inventors: 宫新光
Original assignee: Hangpei Technology Shenzhen Co ltd
Current assignee: Hangpei Technology Shenzhen Co ltd
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-05-12

Abstract

The embodiment of the application relates to the technical field of redundant power supply, and discloses a power supply system and a power supply control method, wherein the power supply system comprises: the system comprises a first power supply source, a medium-voltage power generation device, a controller and a first power supply module; the first power supply module includes: the low-voltage power generation device, the transformer, the first change-over switch and the second change-over switch; the medium-voltage power generation device, the low-voltage power generation device, the first change-over switch and the second change-over switch are all in signal connection with the controller; two input ends of the second change-over switch are respectively connected with the output ends of the first power supply and the medium-voltage power generation device, and the output end of the second change-over switch is connected with the input end of the transformer; the two input ends of the first change-over switch are respectively connected with the output ends of the low-voltage power generation device and the transformer, and the output end of the first change-over switch is used for being connected with a load. In this way, the embodiment of the application reduces the cost of redundant power supply.

Description

Power supply system and power supply control method

Technical Field

The embodiment of the application relates to the technical field of redundant power supply, in particular to a power supply system and a power supply control method.

Background

The existing power supply system generally sets a low-voltage power generation device on a power supply circuit of mains supply through a change-over switch to carry out power supply redundancy, so that when the mains supply fails, normal power supply to a load is realized by switching the power supply circuit to the low-voltage power generation device. Meanwhile, in an application scenario of high-reliability power supply, for example, in the field of a data center, the low-voltage power generation device is used as a backup power supply of commercial power, and a redundancy unit is additionally configured to form n+x redundancy backups (N is the number of low-voltage power generation devices required by power supply load capacity, and X is the number of redundant low-voltage power generation devices), so that when one low-voltage power generation device fails or overhauls, the additionally redundant low-voltage power generation device can still be used as an emergency backup power supply for power supply when the commercial power fails.

However, in the low-voltage power generation device power supply system with redundant configuration, the physical path of the wire harness of the power supply circuit of the low-voltage power generation device with redundant configuration is longer, and because the output voltage of the low-voltage power generation device is small and the current is large, the wire harness of the power supply circuit needs to be ensured to meet the requirement of large current when the low-voltage power generation device is configured with additional redundancy, so that the cost of the wire harness of the low-voltage power generation device with redundant configuration is increased.

Disclosure of Invention

In view of the above problems, embodiments of the present application provide a power supply system and a power supply control method, which are used for solving the problem of high redundancy cost of the existing power supply system.

According to an aspect of the embodiments of the present application, there is provided a power supply system including: the system comprises a first power supply source, a medium-voltage power generation device, a controller and a first power supply module; the first power supply module includes: the low-voltage power generation device, the transformer, the first change-over switch and the second change-over switch; the medium-voltage power generation device, the low-voltage power generation device, the first change-over switch and the second change-over switch are all in signal connection with the controller; two input ends of the second change-over switch are respectively connected with the output ends of the first power supply and the medium-voltage power generation device, and the output end of the second change-over switch is connected with the input end of the transformer; the two input ends of the first change-over switch are respectively connected with the output ends of the low-voltage power generation device and the transformer, and the output end of the first change-over switch is used for being connected with a load; the first switching switch is configured to have a first state and a second state; in the first state, only the input end connected with the transformer in the first change-over switch is conducted; in the second state, the first change-over switch is only connected with the input end connected with the low-voltage power generation device; the second change-over switch is configured to have a third state and a fourth state; in the third state, the second change-over switch is only connected with the input end of the first power supply; in the fourth state, the second change-over switch is only conducted with the input end connected with the medium-voltage power generation device; the controller is used for controlling the second change-over switch in the first power supply module to be in a third state under a default working condition, and the first change-over switch in the first power supply module is in a first state so that the first power supply source supplies power to the load; the controller is used for controlling the low-voltage power generation device in the first power supply module to start when the output voltage of the transformer in the first power supply module exceeds a first threshold range, and controlling the first change-over switch in the first power supply module to be switched to a second state when the output voltage of the low-voltage power generation device in the first power supply module is within the first threshold range so as to enable the low-voltage power generation device in the first power supply module to supply power to the load; the controller is used for controlling the medium voltage power generation device to start when the output voltage of the low voltage power generation device in the first power supply module exceeds a first threshold range and the output voltage of the first power supply source exceeds a second threshold range, and controlling the second change-over switch in the first power supply module to switch to a fourth state when the output voltage of the medium voltage power generation device is in the second threshold range, and enabling the first change-over switch in the first power supply module to switch to a first state so as to enable the medium voltage power generation device in the first power supply module to supply power to a load.

In an optional manner, the controller is configured to control the low-voltage power generation device in the first power supply module to start when the output voltage of the transformer in the first power supply module exceeds the first threshold range and the duration is longer than the first time threshold; the controller is used for controlling the medium-voltage power generation device to start when the output voltage of the low-voltage power generation device in the first power supply module exceeds a first threshold range and the duration time is longer than a second time threshold and the output voltage of the first power supply exceeds a second threshold range and the duration time is longer than a third time threshold after the low-voltage power generation device in the first power supply module is started.

In an alternative manner, the number of the first power supply modules is a plurality.

In an alternative manner, the rated output power of the first power supply is greater than or equal to the sum of the rated output powers of all the first power supply modules; the rated output power of the low-voltage power generation device is larger than or equal to the rated output power of the first power supply module where the low-voltage power generation device is positioned; the rated output power of the medium-voltage power generation device is larger than or equal to the rated output power of any one of the first power supply modules.

In an alternative, the number of medium voltage power generators is plural, and the outputs of the plural medium voltage power generators are connected to the same input of each second transfer switch.

In an optional mode, the power supply system further comprises a second power supply source and a second power supply module, the second power supply module and the first power supply module are identical in structure, the connection mode between the controller and the second power supply module is identical to the connection mode between the controller and the first power supply module, and the connection mode between the second power supply source and the second power supply module is identical to the connection mode between the first power supply source and the first power supply module; the first power supply module and the second power supply module share the low-voltage power generation device and the medium-voltage power generation device, the output end of the first change-over switch in the first power supply module and the output end of the first change-over switch in the second power supply module are commonly used for being connected with a load, and the output end of the first change-over switch in the first power supply module and the output end of the first change-over switch in the second power supply module are redundant backups; the control mode of the controller to the second power supply module is the same as the control mode to the first power supply module.

In an alternative mode, the number of the first power supply modules and the number of the second power supply modules are the same and are multiple; the first power supply modules and the second power supply modules are arranged in one-to-one correspondence, and the corresponding first power supply module and second power supply module share a low-voltage power generation device; all the first power supply modules and all the second power supply modules share at least one medium voltage power generation device.

In an alternative manner, the rated output power of the first power supply is greater than or equal to the sum of the rated output powers of all the first power supply modules, and the rated output power of the second power supply is greater than or equal to the sum of the rated output powers of all the second power supply modules; the rated output power of the low-voltage power generation device is larger than or equal to the larger value of the rated output power of the first power supply module and the rated output power of the second power supply module where the low-voltage power generation device is positioned; the rated output power of the medium-voltage power generation device is larger than or equal to the larger value of the rated output power of any group of first power supply modules and the rated output power of any group of second power supply modules, wherein the first power supply modules and the second power supply modules have one-to-one correspondence.

In an alternative manner, the number of first power supply modules is greater than the number of second power supply modules; the first power supply modules and the second power supply modules are arranged in one-to-one correspondence, and the corresponding first power supply module and second power supply module share a low-voltage power generation device; all the first power supply modules and all the second power supply modules share at least one medium-voltage power generation device; the rest first switch switches in the first power supply modules which are not in one-to-one correspondence with the second power supply modules are used for being connected with the load independently.

In an alternative manner, the rated output power of the first power supply is greater than or equal to the sum of the rated output powers of all the first power supply modules, and the rated output power of the second power supply is greater than or equal to the sum of the rated output powers of all the second power supply modules; the rated output power of the low-voltage power generation device shared by the first power supply module and the second power supply module with one-to-one correspondence is larger than or equal to the larger value of the rated output power of the first power supply module and the rated output power of the second power supply module where the rated output power of the low-voltage power generation device is located; the rated output power of the low-voltage power generation devices in the other first power supply modules which do not have one-to-one correspondence with the second power supply modules is larger than or equal to the rated output power of the first power supply module in which the low-voltage power generation devices are positioned; the rated output power of the medium-voltage power generation device is larger than or equal to the larger value of the rated output power of any one group of first power supply modules and the rated output power of the second power supply modules, which have one-to-one correspondence, and the rated output power of the medium-voltage power generation device is also larger than or equal to the rated output power of any one first power supply module which has no one-to-one correspondence with the second power supply modules.

According to another aspect of the embodiments of the present application, there is provided a power supply control method applied to the power supply system in any one of the above-mentioned aspects, the method including: under a default working condition, controlling a second change-over switch in the first power supply module to be in a third state, and enabling the first change-over switch in the first power supply module to be in a first state so as to enable the first power supply source to supply power to a load; judging whether the output voltage of a transformer in the first power supply module exceeds a first threshold range; if yes, the low-voltage power generation device in the first power supply module is controlled to start; judging whether the output voltage of the low-voltage power generation device in the first power supply module is in a first threshold range or not; if yes, a first change-over switch in the first power supply module is controlled to be switched to a second state, so that the low-voltage power generation device in the first power supply module supplies power to the load; if not, judging whether the output voltage of the first power supply exceeds a second threshold range; if yes, the medium-voltage power generation device is controlled to start; judging whether the output voltage of the medium-voltage power generation device is in a second threshold range or not; if yes, the second change-over switch in the first power supply module is controlled to be switched to a fourth state, and the first change-over switch in the first power supply module is controlled to be switched to a first state, so that the medium-voltage power generation device in the first power supply module supplies power to the load.

In an alternative manner, if yes, the low-voltage power generation device in the first power supply module is controlled to start, including: if yes, judging whether the duration of the output voltage of the transformer in the first power supply module exceeding the first threshold range is greater than a first time threshold; if yes, the low-voltage power generation device in the first power supply module is controlled to start; if not, judging whether the output voltage of the first power supply exceeds a second threshold range, including: if not, judging whether the duration of the output voltage of the low-voltage power generation device in the first power supply module exceeding the first threshold range is greater than a second time threshold; if yes, judging whether the output voltage of the first power supply exceeds a second threshold range; if yes, controlling the medium-voltage power generation device to start, including: if yes, judging whether the duration of the output voltage of the first power supply exceeding the second threshold range is greater than a third time threshold; if yes, the medium-voltage power generation device is controlled to start.

In an optional mode, the power supply system further comprises a second power supply source and a second power supply module, the second power supply module and the first power supply module are identical in structure, and the connection mode between the second power supply source and the second power supply module is identical to the connection mode between the first power supply source and the first power supply module; the first power supply module and the second power supply module share the low-voltage power generation device and the medium-voltage power generation device, the output end of the first change-over switch in the first power supply module and the output end of the first change-over switch in the second power supply module are commonly used for being connected with a load, and the output end of the first change-over switch in the first power supply module and the output end of the first change-over switch in the second power supply module are redundant backups; under the default condition, the second change-over switch in the first power supply module is controlled to be in a third state, and the first change-over switch in the first power supply module is in a first state, so that the first power supply supplies power to the load, and the method comprises the following steps: under a default working condition, controlling the second change-over switch in the first power supply module and the second power supply module to be in a third state, and enabling the first change-over switch in the first power supply module and the second power supply module to be in a first state so that the first power supply module outputs power from the first power supply, and the second power supply module outputs power from the second power supply, wherein the first power supply and the second power supply power to a load together; under a default working condition, controlling the second change-over switch in the first power supply module and the second power supply module to be in a third state, and enabling the first change-over switch in the first power supply module and the first change-over switch in the second power supply module to be in a first state so that the first power supply module outputs power from the first power supply, and the second power supply module outputs power from the second power supply, wherein after the first power supply and the second power supply power to a load together, the method further comprises the steps of: judging whether the output voltage of the transformer in the second power supply module exceeds a first threshold range; if yes, the low-voltage power generation device in the second power supply module is controlled to start; judging whether the output voltage of the low-voltage power generation device in the second power supply module is in a first threshold range or not; if yes, the first change-over switch in the second power supply module is controlled to be switched to a second state, so that the low-voltage power generation device in the second power supply module supplies power to the load; if not, judging whether the output voltage of the second power supply exceeds a second threshold range; if yes, the medium-voltage power generation device is controlled to start; judging whether the output voltage of the medium-voltage power generation device is in a second threshold range or not; if yes, the second change-over switch in the second power supply module is controlled to be switched to a fourth state, and the first change-over switch in the second power supply module is controlled to be switched to a first state, so that the medium-voltage power generation device in the second power supply module supplies power to the load.

In an alternative manner, if yes, the low-voltage power generation device in the second power supply module is controlled to start, including: if yes, judging whether the duration of the output voltage of the transformer in the second power supply module exceeding the first threshold range is greater than a first time threshold; if yes, the low-voltage power generation device in the second power supply module is controlled to start; if not, judging whether the output voltage of the second power supply exceeds a second threshold range, including: if not, judging whether the duration of the output voltage of the low-voltage power generation device in the second power supply module exceeding the first threshold range is greater than a second time threshold; if yes, judging whether the output voltage of the second power supply exceeds a second threshold range; if yes, controlling the medium-voltage power generation device to start, including: if yes, judging whether the duration of the output voltage of the second power supply exceeding the second threshold range is greater than a third time threshold; if yes, the medium-voltage power generation device is controlled to start.

In the power supply system provided by the embodiment of the application, the low-voltage power generation device and the transformer are arranged in the middle of the first power supply module, and are respectively connected to the two input ends of the first change-over switch, and the output end of the first change-over switch is used for connecting a load to supply power, so that the low-voltage power generation device is located at a position closer to the load, and the low-voltage power generation device can supply power to the load only by a short wire harness, thereby effectively reducing the wire harness cost. The first power supply and the medium voltage power generation device are respectively connected to the two input ends of the second change-over switch, and the output end of the second change-over switch is connected to the input end of the transformer, so that the first power supply and the medium voltage power generation device can be output to the same transformer, the transformer can reduce the voltage output by the first power supply and the voltage output by the medium voltage power generation device, the cost can be reduced, and the first power supply and the medium voltage power generation device are generally arranged at a position far from the first power supply module, and the output voltage of the first power supply and the output voltage of the medium voltage power generation device are large and the output current of the first power supply and the output voltage of the medium voltage power generation device are small, so that the wire harness requirements between the first power supply and the medium voltage power generation device and the transformer are lower, and the cost can be further reduced.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic diagram of a power module according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a power supply module according to another embodiment of the present invention;

fig. 3 is a schematic structural diagram of a power supply module according to another embodiment of the present invention;

fig. 4 is a schematic structural diagram of a power supply module according to another embodiment of the present invention;

fig. 5 is a schematic structural diagram of a power supply module according to another embodiment of the present invention;

fig. 6 is a schematic structural diagram of a power supply module according to another embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a power supply module according to another embodiment of the present invention;

fig. 8 is a schematic structural diagram of a power supply module according to another embodiment of the present invention;

fig. 9 is a schematic structural diagram of a power supply module according to another embodiment of the present invention;

FIG. 10 is a flowchart of a power supply control method according to an embodiment of the present invention;

FIG. 11 is a flow chart of sub-steps of some of the steps of FIG. 10;

FIG. 12 is a flowchart showing a portion of steps in a power control method according to another embodiment of the present invention;

fig. 13 is a flow chart of substeps of some of the steps of fig. 12.

Reference numerals in the specific embodiments are as follows:

100. a power supply system; 110. a first power supply; 120. a medium voltage power generation device; 130. a controller; 140. a first power supply module; 141. a low voltage power generation device; 142. a transformer; 143. a first changeover switch; 144. a second change-over switch; 150. a second power supply; 160. a second power supply module;

500. and (3) loading.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: there are three cases, a, B, a and B simultaneously. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

For the mode that the low-voltage power generation device is arranged on the mains supply power supply circuit through the change-over switch to carry out redundancy in the power supply system, because the power supply circuit wire harness is generally longer, the output current of the low-voltage power generation device is larger, in order to meet the normal output of the current, the problem of high wire harness cost is inevitably caused, and the cost of the whole power supply system of the low-voltage power generation device with N+X redundancy is further increased.

Based on this, the embodiment of the application proposes a power supply system, specifically, through setting up low-voltage power generation device and transformer in the middle of the first power supply module, and low-voltage power generation device and transformer are connected respectively in two inputs of first change over switch, and be used for connecting the load by the output of first change over switch and supply power, make low-voltage power generation device be located the position that is close to the load, thereby only need the short pencil alright realize low-voltage power generation device to the load power supply, effectively reduce the pencil cost. The first power supply and the medium voltage power generation device are respectively connected to the two input ends of the second change-over switch, and the output end of the second change-over switch is connected to the input end (primary side of the transformer) of the transformer, so that the output of the first power supply or the medium voltage power generation device can be output to the same transformer, the transformer can reduce the voltage output by the first power supply and the voltage output by the medium voltage power generation device, the cost can be reduced, and the first power supply and the medium voltage power generation device are generally arranged at a position far from the first power supply module, and the output voltage of the first power supply and the output voltage of the medium voltage power generation device are large and small, so that the wire harness requirements between the first power supply and the medium voltage power generation device and the transformer are lower, and the cost can be further reduced.

In the control logic of the power supply system provided by the embodiment of the application, the low-voltage power generation device is switched by the first switch to supply power to the emergency power supply, so that the characteristic of high response speed of the low-voltage power generation device is fully utilized, and the low-voltage power generation device can be ensured to be connected into the load to supply power quickly when the first power supply fails. In order to ensure reliable redundancy, the medium voltage power generation device can also supply power to the load by switching control of the first and second switches when the low voltage power generation device fails. In the power supply system provided by the embodiment of the application, the first power supply supplies power to the load under the default working condition, the low-voltage power generation device is switched to supply power preferentially, and the secondary medium-voltage power generation device is switched to supply power secondarily, so that the power supply system is reliably redundant, the emergency capacity of the power supply system is improved, and normal power supply to the load is guaranteed.

The power supply system provided by the embodiment of the application can be used for, but is not limited to, data center power supply, industrial park power supply, production plant area power supply and the like.

Specifically, referring to fig. 1, a schematic structural diagram of a power supply system provided in an embodiment of the present application is shown. As shown in the figure, the power supply system 100 includes: the power supply system comprises a first power supply 110, a medium-voltage power generation device 120, a controller 130 and a first power supply module 140. The first power supply module 140 includes: a low voltage power generation device 141, a transformer 142, a first switch 143, and a second switch 144. The medium voltage power generation device 120, the low voltage power generation device 141, the first switch 143 and the second switch 144 are all in signal connection with the controller 130. Two input ends of the second change-over switch 144 are respectively connected with the output ends of the first power supply 110 and the medium voltage power generation device 120, the output end of the second change-over switch 144 is connected with the input end of the transformer 142, two input ends of the first change-over switch 143 are respectively connected with the output ends of the low voltage power generation device 141 and the transformer 142, and the output end of the first change-over switch 143 is used for being connected with the load 500.

The first switch 143 is configured to have a first state in which only the input terminal of the first switch 143 connected to the transformer 142 is turned on (i.e., only the input terminal 1 of the first switch 143 in fig. 1) and a second state in which only the input terminal of the first switch 143 connected to the low-voltage power generation device 141 is turned on (i.e., only the input terminal 2 of the first switch 143 in fig. 1). The second change-over switch 144 is configured to have a third state in which only the input terminal of the second change-over switch 144 connected to the first power supply 110 is turned on (i.e., only the input terminal 3 of the second change-over switch 144 in fig. 1) and a fourth state in which only the input terminal of the second change-over switch 144 connected to the medium voltage power generation device 120 is turned on (i.e., only the input terminal 4 of the second change-over switch 144 in fig. 1).

As shown in fig. 2, the arrow direction in the figure indicates the current flow when the first power supply 110 supplies power to the load 500 under the default condition. The controller 130 is configured to control the second switch 144 in the first power supply module 140 to be in the third state under the default condition, and the first switch 143 in the first power supply module 140 to be in the first state, so that the first power supply 110 supplies power to the load 500.

As shown in fig. 3, the arrow direction in the figure indicates the current flow when the low-voltage power generation device 141 supplies power to the load 500. The controller 130 is configured to control the low-voltage power generation device 141 in the first power supply module 140 to start when the output voltage of the transformer 142 in the first power supply module 140 exceeds a first threshold range, and control the first switch 143 in the first power supply module 140 to switch to the second state when the output voltage of the low-voltage power generation device 141 in the first power supply module 140 is within the first threshold range, so that the low-voltage power generation device 141 in the first power supply module 140 supplies power to the load 500.

As shown in fig. 4, the arrow direction in the figure indicates the current flow when the medium voltage power generation apparatus 120 supplies power to the load 500. The controller 130 is configured to control the medium voltage power generation device 120 to start when the output voltage of the low voltage power generation device 141 in the first power supply module 140 exceeds a first threshold range and the output voltage of the first power supply 110 exceeds a second threshold range, and control the second switch 144 in the first power supply module 140 to switch to a fourth state when the output voltage of the medium voltage power generation device 120 is within the second threshold range, and control the first switch 143 in the first power supply module 140 to switch to the first state to enable the medium voltage power generation device 120 in the first power supply module 140 to supply power to the load 500.

The first power supply 110 may be a utility power, the medium voltage power generation device 120 may be a medium voltage generator, and the low voltage power generation device 141 may be a low voltage generator. The output currents of the first power supply 110 and the medium voltage power generation device 120 are both ac, and the transformer 142 is used for reducing the output voltage of the first power supply 110 or the medium voltage power generation device 120, so as to ensure that the voltage output by the first switch 143 to the load 500 meets the load requirement.

The first and

second switches

143 and 144 may each be an automatic transfer switch. An automatic transfer switch (Automatic transfer switching equipment, ATS, hereinafter referred to as ATS switch) is a switching device for automatically switching a load circuit from one power source to another (standby) power source to ensure continuous, reliable operation of an important load.

In order to fully utilize the advantage of rapid response of the low-voltage power generation device 141, the low-voltage power generation device 141 is directly disposed at the input terminal of the first switch 143 for redundancy. In the event of a failure of the first power supply 110, the low voltage power generation device 141 may switch over preferentially, enabling a fast response and switching in to provide reliable power to the load 500.

In order that the load 500 may be supported by sufficiently reliable power, a further redundancy of the medium voltage power generation device 120 is provided in addition to the redundancy of the low voltage power generation device 141. Specifically, by connecting the two input ends of the second change-over switch 144 to the first power supply 110 and the medium voltage power generation device 120, respectively, and connecting the output end of the second change-over switch 144 to the input end of the transformer 142, it is achieved that the first power supply 110 and the medium voltage power generation device 120 can output to the transformer 142, so that when both the first power supply 110 and the low voltage power generation device 141 fail, the load 500 is supplied with power by switching in the medium voltage power generation device 120 and stepping down through the transformer 142. The medium voltage power generation device 120 is far from the access end of the load 500, but the medium voltage power generation device 120 outputs a large voltage and a small current, so that the requirement on the conductive current-carrying capacity of the wire harness is low, and the increase of the cost can be effectively avoided.

The low-voltage power generation device 141 and the medium-voltage power generation device 120 are emergency power supply devices in the power supply system 100 and include n+x redundancy backup, so as shown in fig. 2, under a default working condition, the input terminal 1 of the first switch 143 is turned on, the input terminal 3 of the second switch 144 is turned on, and the voltage provided by the first power supply 110 is reduced by the transformer 142 and then provided to the load 500.

In the process that the power supply system 100 works under the default working condition, the controller 130 detects the output voltage of the transformer 142, when the output voltage of the transformer 142 exceeds the first threshold range, the controller 130 firstly controls the low-voltage power generation device 141 to start, and since a certain time is required from the start of the low-voltage power generation device 141 to the stabilization of the output voltage, in order to ensure that the voltage output to the load 500 is stable and reliable, the controller 130 firstly detects the output voltage of the low-voltage power generation device 141 after the low-voltage power generation device 141 is started, and when the output voltage of the low-voltage power generation device 141 is within the first threshold range, the first switch 143 is controlled to be switched to the input end 2 to be turned on (as shown in fig. 3), so that the low-voltage power generation device 141 outputs reliable power to the load 500. The first threshold range may be set according to an application scenario of the power supply system 100 or a type of the access load 500, and for an industrial power application scenario such as a data center, the first threshold range may be set to, for example, 340V to 420V of three-phase ac.

By detecting the output voltage of the transformer 142 to control the connection of the low-voltage power generation device 141, compared with the case of detecting the output voltage of the first power supply 110 to control the connection of the low-voltage power generation device 141, the problem that the output voltage of the first power supply 110 is normal and the transformer 142 fails to supply power to the load 500 normally can be avoided.

Based on this, in order to be able to quickly confirm the faulty component, in some embodiments, when the output voltage of the transformer 142 exceeds the first threshold range, the controller 130 may not only control the low-voltage power generation device 141 to switch on, but also detect the output voltage of the first power supply 110, and when detecting that the output voltage of the first power supply 110 is within the second threshold range, it indicates that the output of the first power supply 110 is normal, at which time the controller 130 outputs a transformer fault signal, for example, the fault signal may be output through a corresponding indicator light or display screen. When the output voltage of the first power supply 110 is detected to be out of the second threshold range, which indicates that the output of the first power supply 110 is abnormal, the controller 130 outputs a first power supply failure signal. After outputting the corresponding fault signal via the controller 130, the technician can quickly determine the cause of the fault and make targeted repairs.

When the power supply system 100 is switched to be supplied by the low-voltage power generation device 141, the controller 130 detects the output voltage of the low-voltage power generation device 141 and the output voltage of the first power supply 110, when the output voltage of the low-voltage power generation device 141 exceeds a first threshold range and the output voltage of the first power supply 110 exceeds a second threshold range, the medium-voltage power generation device 120 is controlled to start first, and when the output voltage of the medium-voltage power generation device 120 is within the second threshold range, the input terminal 4 of the second switch 144 is controlled to be turned on, and the input terminal 1 of the first switch 143 is turned on (as shown in fig. 4), so that power is supplied to the load 500 through the medium-voltage power generation device 120. Similarly, in the case of application of industrial power such as a data center, the output voltage of the first power supply 110 and the medium voltage power generator 120 is typically 10KV three-phase ac power, and the voltage is reduced to 380V three-phase ac power by the transformer 142, so the second threshold range may be set to 9KV to 11KV three-phase ac power.

In the power supply system 100 provided by the embodiment of the application, the low-voltage power generation device 141 and the transformer 142 are arranged in the first power supply module 140, the low-voltage power generation device 141 and the transformer 142 are respectively connected to the two input ends of the first change-over switch 143, the output end of the first change-over switch 143 is used for being connected with the load 500 to supply power, the low-voltage power generation device 141 is located at a position closer to the load, and therefore the low-voltage power generation device 141 can supply power to the load 500 only by a short wire harness, and the wire harness cost is effectively reduced. The first power supply 110 and the medium voltage power generation device 120 are respectively connected to the two input ends of the second change-over switch 144, and the output end of the second change-over switch 144 is connected to the input end of the transformer 142, so that the first power supply 110 and the medium voltage power generation device 120 can be output to the same transformer 142, the transformer 142 can step down the voltage output by the first power supply 110, and step down the voltage output by the medium voltage power generation device 120, and the medium voltage power generation device 120 is generally arranged at a position far from the first power supply module 140, and the medium voltage power generation device 120 outputs a large voltage and a small current, so that the wire harness requirement between the medium voltage power generation device 120 and the transformer 142 is lower, and the cost can be further reduced.

In the control logic, the power supply system 100 preferably switches the low-voltage power generation device 141 through the first switch 143 to supply power, so that the characteristic of high response speed of the low-voltage power generation device 141 is fully utilized, and when the first power supply 110 fails, the low-voltage power generation device 141 can be ensured to be quickly connected to supply power to the load 500. In order to ensure reliable redundancy, the medium voltage power generation apparatus 120 may also be controlled to supply power to the load 500 by switching the first and

second switches

143, 144 when the low voltage power generation apparatus 141 fails. In the power supply system 100, the first power supply 110 supplies power to the load 500 under the default working condition, and the three working conditions of power supply by the low-voltage power generation device 141 and power supply by the secondary switching medium-voltage power generation device 120 are preferably switched, so that the power supply system 100 is fully and reliably redundant, the emergency power supply capability of the power supply system 100 is improved, and normal power supply to the load 500 is ensured.

In order to prevent the controller 130 from judging an error due to voltage fluctuation and causing the problem of erroneous switching of the first switch 143 or the second switch 144, the present application further proposes an embodiment, specifically, the controller 130 is configured to control the low-voltage power generation device 141 in the first power supply module 140 to be started when the output voltage of the transformer 142 in the first power supply module 140 exceeds the first threshold range and the duration time is longer than the first time threshold. The controller 130 is configured to control the medium voltage power generation device 120 to start when the output voltage of the low voltage power generation device 141 in the first power supply module 140 exceeds the first threshold range and the duration time is longer than the second time threshold after sending a start signal to the low voltage power generation device 141 in the first power supply module 140, and the duration time when the output voltage of the first power supply 110 exceeds the second threshold range is longer than the third time threshold.

Specifically, the first time threshold, the second time threshold, and the third time threshold may be set to equal time or unequal time according to experience obtained by frequently occurring fault conditions, for example, all of the first time threshold and the second time threshold may be set to one minute, or the first time threshold and the second time threshold may be set to one minute, the third time threshold is set to two minutes, and specific time setting is not limited herein.

By controlling the low-voltage power generation device 141 in the first power supply module 140 to start when the output voltage of the transformer 142 exceeds the first threshold range and the duration is longer than the first time threshold, the controller 130 does not directly control the low-voltage power generation device 141 to start when the voltage in the power supply circuit of the first power supply 110 fluctuates briefly, so as to prevent frequent switching, and only when the output voltage of the transformer 142 fluctuates for a long time (i.e. the duration is longer than the first time threshold), the controller controls the low-voltage power generation device 141 to be connected for power supply. The controller 130 is similar to the on-off control of the medium voltage power generation device 120 to prevent the controller 130 from frequently starting the medium voltage power generation device 120 and switching on to supply power when a transient fluctuation occurs in the output voltage of the low voltage power generation device 141.

In application scenarios such as a data center, an office building, and an industrial park, the power supply system 100 needs to supply power to different types of loads 500 in different areas, and therefore, the present application further proposes an embodiment, and referring specifically to fig. 5, which shows a schematic structural diagram of the power supply system 100 provided by another embodiment of the present application. As shown in the figure, the number of the first power supply modules 140 is a plurality.

The number of the first power supply modules 140 is a plurality, that is, when the power supply system 100 is arranged in a specific application scenario, the first power supply 110 and the medium voltage power generation device 120 are arranged in important power regulation and control areas such as a machine room, the second switch 144 in the first power supply module 140 can be arranged in the machine room or in an area connected with the load 500, and other components in the first power supply module 140 need to be arranged in the area connected with the load 500, so that the output end of the first switch 143 is connected with the load 500 to supply power to the load 500.

When the number of the first power supply modules 140 is plural and the power supply modules are disposed in different areas, the distance between the medium voltage power generation device 120 and each of the first power supply modules 140 increases, and the power supply path becomes longer. Based on this, just because the output voltage of the medium voltage power generation device 120 is high and the output current is small, the cost of the wire harness between the medium voltage power generation device 120 and each first power supply module 140 is low, so that the power distribution cost can still be effectively controlled in the case of increasing the length of the wire harness.

In addition, the control logic of the plurality of first power supply modules 140 is the same, and specifically, under the default condition, the first power supply 110 supplies power to all the first power supply modules 140 connected with the load 500. When the output voltage of the transformer 142 in one or several first power supply modules 140 exceeds the first threshold range, the low-voltage power generation device 141 in one or several first power supply modules 140 is started and connected to supply power to the load 500 through the first switch 143. When the output voltages of the transformers 142 in all the first power supply modules 140 exceed the first threshold range, all the low-voltage power generation devices 141 in the first power supply modules 140 are started and connected. Similarly, the capacity of the medium voltage power generation device 120 may be configured to be greater than or equal to the sum of rated output powers of any one or any several first power supply modules 140, so that when the output voltage of the low voltage power generation device 141 in one or several first power supply modules 140 exceeds a first threshold range and the output voltage of the first power supply 110 exceeds a second threshold range, the medium voltage power generation device 120 is controlled to be started and connected, so that the medium voltage power generation device 120 supplies power to the load 500 in the one or several first power supply modules 140.

After the number of the first power supply modules 140 is set to be multiple, reliable redundant power supply to the loads 500 in different areas in a specific application scene can be satisfied.

Further, in order to meet the requirement that the power supply system 100 can perform reliable and effective redundant power supply under different conditions, the present application further proposes an embodiment, specifically, the rated output power of the first power supply 110 is greater than or equal to the sum of the rated output powers of all the first power supply modules 140, and the rated output power of the low-voltage power generating device 141 is greater than or equal to the rated output power of the first power supply module where it is located. The rated output power of the medium voltage power generation device 120 is greater than or equal to the rated output power of any one of the first power supply modules 140.

It should be noted that, since the output power of the first power supply module 140 is provided by the first power supply 110, the low-voltage power generation device 141, or the medium-voltage power generation device 120, the rated output power of the first power supply module 140 refers to the power when the first power supply module 140 is connected to the load 500 and supplies power to the load 500. The rated output power of each first power supply module 140 may be set correspondingly according to the type of the access load 500, and the rated output power of each first power supply module 140 may be set equal, which may, of course, also be different.

The rated output power of the medium voltage power generation device 120 is greater than or equal to the rated output power of any one of the first power supply modules 140, that is, the rated output power of the medium voltage power generation device 120 needs to be greater than the output power value of the first power supply module 140 with the largest rated output power.

Considering that the probability of failure of both the first power supply 110 and all the low-voltage power generation devices 141 is small and the medium-voltage power generation device 120 is a redundant power supply device of the last stage, it is in an inactive state for a long time during the actual power supply, and thus, setting the rated output power of the medium-voltage power generation device 120 to be greater than or equal to the sum of the rated output powers of all the first power supply modules 140 may result in an increase in the cost of the medium-voltage power generation device 120.

Based on this, in order to achieve both of the power supply redundancy and the cost, the rated output power of the medium voltage power generation device 120 is set to be greater than or equal to the rated output power value of any one of the first power supply modules 140, so that it is ensured that the medium voltage power generation device 120 can be connected to and normally supply stable power to the load 500 connected to the first power supply module 140 when the low voltage power generation device 141 in any one of the first power supply modules 140 fails.

The rated output power of the first power supply 110 is set to be greater than or equal to the sum of the rated output powers of all the first power supply modules 140, so that all the first power supply modules 140 can be normally connected to the load 500 for power supply under the default working condition. The rated output power of the low-voltage power generation device 141 is set to be greater than or equal to the rated output power of the first power supply module 140 where the low-voltage power generation device 141 is located, so that when the first power supply 110 or the transformer 142 fails, the low-voltage power generation device 141 can normally provide power to the load 500 connected with the first power supply module 140 where the low-voltage power generation device 141 is located.

In order to further improve the capability of the power supply system 100 to cope with emergency situations, an embodiment is further provided, and referring specifically to fig. 6, a structure of a power supply system provided in another embodiment of the present application is shown. As shown in the figure, the number of the medium voltage power generation apparatuses 120 is plural, and the output terminals of the plural medium voltage power generation apparatuses 120 are connected to the same input terminal of each of the second change-over switches 144.

Specifically, when the medium voltage power generation device 120 is needed to supply power, the power may be output after the multiple medium voltage power generation devices 120 are connected in parallel, that is, if the sum of rated output powers of one or more first power supply modules 140 powered by the medium voltage power generation device 120 is P ₁ The output power of each medium voltage power generation device 120 is P ₁ N, where n is the number of parallel medium voltage power generation devices 120. It will be appreciated that when some of the medium voltage power generation devices 120 fail, the sum of the rated output powers of the one or more first power supply modules 140 is amortized by the rest of the medium voltage power generation devices 120 that are normally operable to be P ₁ Thereby, a redundant medium voltage power plant 120 is formed, i.e. the medium voltage power plant redundancy is X, X being greater than 1, to ensure that reliable power can still be provided to the load 500 by the remaining medium voltage power plants 120 when part of the medium voltage power plants 120 fail.

In other embodiments, the plurality of medium voltage power generation devices 120 may not be connected in parallel, but priority is set for the plurality of medium voltage power generation devices 120, when the medium voltage power generation device 120 needs to be connected in power supply, the medium voltage power generation device 120 with the highest priority is connected in power supply, when the output voltage of the medium voltage power generation device 120 with the highest priority is abnormal (for example, when the output voltage exceeds the second threshold range), the next medium voltage power generation device 120 is connected in power supply, and so on, redundancy of the medium voltage power generation device 120 is realized.

By arranging the medium voltage power generation apparatuses 120 in a plurality and forming redundancy with each other, when part of the medium voltage power generation apparatuses 120 fail, the rest of the medium voltage power generation apparatuses 120 can still provide reliable power to the load 500, thereby improving the emergency capability of the power supply system 100 and ensuring normal supply of power.

In order to further improve the emergency capability of the power supply system 100, an embodiment is further provided, and referring specifically to fig. 7, which illustrates a structure of the power supply system provided in another embodiment of the present application. As shown in the figure, the power supply system 100 further includes a second power supply 150 and a second power supply module 160, where the second power supply module 160 has the same structure as the first power supply module 140, and the connection manner between the controller 130 and the second power supply module 160 is the same as the connection manner between the first power supply module 140 and the connection manner between the second power supply 150 and the second power supply module 160 is the same as the connection manner between the first power supply 110 and the first power supply module 140. The first power supply module 140 and the second power supply module 160 share the low-voltage power generation device 141 and the medium-voltage power generation device 120, the output end of the first switch 143 in the first power supply module 140 and the output end of the first switch 143 in the second power supply module 160 are commonly used for being connected with the load 500, and the output end of the first switch 143 in the first power supply module 140 and the output end of the first switch 143 in the second power supply module 160 are redundant. The controller 130 controls the second power supply module 160 in the same manner as the first power supply module 140.

The output end of the first switch 143 in the first power supply module 140 and the output end of the first switch 143 in the second power supply module 160 are redundant, which means that under normal conditions, if the power required by the load 500 is P ₂ The power provided by the output end of the first switch 143 in the first power supply module 140 and the output end of the first switch 143 in the second power supply module 160 to the load 500 is P ₂ /2, or according to the power supply requirement of the load 500, the input power of one end of the load is 0, and the input power of the other end is P ₂ . When the first isWhen the power supply module 140 fails, the output end of the first switch 143 in the second power supply module 160 alone provides power P to the load 500 ₂ To ensure proper operation of the load 500. Conversely, if the second power supply module 160 fails, the output end of the first switch 143 in the first power supply module 140 alone provides the load 500 with power P ₂ Is a power source of the power source.

By setting the output end of the first switch 143 in the first power supply module 140 and the output end of the first switch 143 in the second power supply module 160 to be redundant, the first power supply module 140 and the second power supply module 160 form 2N redundancy (N is the rated power supply capacity output to the load 500), so that when one of the first power supply module 140 and the second power supply module 160 fails, the other can still provide reliable power to the load 500, and the power supply system 100 has more reliable emergency capability.

As shown in fig. 7, the first power supply module 140 and the second power supply module 160 share the low-voltage power generation device 141 and the medium-voltage power generation device 120, which means that the output end of the low-voltage power generation device 141 is simultaneously connected to the input end 4 of the first switch 143 in the first power supply module 140 and the second power supply module 160, and the output end of the medium-voltage power generation device 120 is simultaneously connected to the input end 2 of the second switch 144 in the first power supply module 140 and the second power supply module 160. By sharing the low-voltage power generation device 141 and the medium-voltage power generation device 120 by the first power supply module 140 and the second power supply module 160, the number of the low-voltage power generation device 141 and the medium-voltage power generation device 120 can be reduced without affecting the redundancy capability of the power supply system 100, thereby reducing the required cost.

The same control manner of the controller 130 on the second power supply module 160 as on the first power supply module 140 means that, under the default condition, the first power supply 110 in the first power supply module 140 provides power to the load 500, and the second power supply 150 in the second power supply module 160 provides power to the load 500. When the output voltage of the first power supply 110 and/or the second power supply 150 is abnormal, the low-voltage power generation device 141 is preferentially connected to the first power supply module 140 and/or the second power supply module 160 to supply power to the load 500, and when the output voltage of the low-voltage power generation device 141 is also abnormal, the first power supply module 140 and/or the second power supply module 160 is connected to the medium-voltage power generation device 120 to supply power.

The first power supply module 140 and the second power supply module 160 form a redundant backup of 2N, and in combination with three mutually redundant power supply working conditions of the first power supply module 140 and the second power supply module 160, nine power supply working conditions are formed in total, so that the power supply system 100 has strong emergency capability, and normal operation of the load 500 under emergency conditions is ensured.

In a specific application scenario, in order to enable the power supply system 100 to supply power to loads 500 in different areas, an embodiment is further provided, and referring to fig. 8, a structure of a power supply system provided in another embodiment of the present application is shown. As shown in the figure, the first power supply module 140 and the second power supply module 160 are the same in number and are all plural. The first power supply modules 140 and the second power supply modules 160 are arranged in a one-to-one correspondence, and the corresponding first power supply module 140 and second power supply module 160 share a low-voltage power generation device 141. All the first power supply modules 140 and all the second power supply modules 160 share at least one medium voltage power generation device 120.

Specifically, as shown in fig. 8, all the first power supply modules 140 and the second power supply modules 160 may share one medium voltage power generation device 120, or the embodiment of the plurality of medium voltage power generation devices 120 shown in fig. 6 may be correspondingly combined into the embodiment shown in fig. 8, so that all the first power supply modules 140 and the second power supply modules 160 share the plurality of medium voltage power generation devices 120.

By arranging the plurality of first power supply modules 140 and the plurality of second power supply modules 160, and the first power supply modules 140 and the second power supply modules 160 are in one-to-one correspondence and are in redundancy backup, the power supply system 100 can provide reliable power for the loads 500 in different areas, and the loads 500 in each area can work normally and stably.

Further, in some embodiments, after the rated output power of the first power supply 110 is greater than or equal to the rated output power of all the first power supply modules 140, the sum of the rated output powers of the second power supply 150 is greater than or equal to the sum of the rated output powers of all the second power supply modules 160. The rated output power of the low-voltage power generation device 141 is greater than or equal to the larger value of the rated output power of the first power supply module 140 and the rated output power of the second power supply module 160 where it is located. The rated output power of the medium voltage power generation device 120 is greater than or equal to the larger value of the rated output power of any one group of the first power supply module 140 and the rated output power of the second power supply module 160, which have a one-to-one correspondence.

Since the corresponding first power supply module 140 and second power supply module 160 are redundant, the rated output power of the first power supply module 140 is equal to the rated output power of the second power supply module 160, and is denoted as P ₃ . When the first power supply module 140 and the second power supply module 160 supply power to the load 500 at the same time, the actual output power of the first power supply module 140 and the actual output power of the second power supply module 160 do not reach the rated output power P ₃ For example, the load 500 is a dual power supply, with both inputs powered at the rated output power P ₃ Half of (P) ₃ /2. When one of the first power supply module 140 and the second power supply module 160 is abnormal and the other power supply module alone supplies power to the load 500, the power output to the load 500 reaches the rated output power P ₃ 。

The number of the first power supply module 140 and the second power supply module 160 is n, and the rated output power is P ₃ For example, the rated output power P of the first power supply 110 ₄ ≥nP ₃ Rated output power P of the second power supply 150 ₅ ≥nP ₃ 。

Considering that the probability of failure of both the first power supply 110 and the second power supply 150 is low, it is only necessary to set the rated output power of the low-voltage power generation device 141 to be greater than or equal to the larger value of the rated output power of the first power supply module 140 and the rated output power of the second power supply module 160 where the low-voltage power generation device 141 is located, so that it is ensured that the low-voltage power generation device 141 can provide reliable power to the load 500 when being connected to the first switch 143 in the first power supply module 140 or the first switch 143 in the second power supply module 160. The rated output power of the medium voltage power generation device 120 is the same, and it is guaranteed that the medium voltage power generation device can be connected to any one of the first power supply modules 140 or any one of the second power supply modules 160 to provide power with reliable power, which is not described herein.

In practical applications, the priority levels of power supply may be different for loads connected in different areas, and based on this, the present application further proposes an embodiment, and particularly please refer to fig. 9, which shows a structure of a power supply system provided in another embodiment of the present application. As shown in the figure, the number of the first power supply modules 140 is greater than the number of the second power supply modules 160. The first power supply modules 140 and the second power supply modules 160 are arranged in a one-to-one correspondence, and the corresponding first power supply module 140 and second power supply module 160 share one low-voltage power generation device 141, and all the first power supply modules 140 and all the second power supply modules 160 share at least one medium-voltage power generation device 120. The remaining first switches 143 of the first power supply modules 140, which have no one-to-one correspondence with the second power supply modules 160, are used to individually connect with the load 500.

It should be noted that, in the embodiment shown in fig. 9, the first power supply 110, the second power supply 150, and the medium voltage power generation device 120 may be understood as unchanged, and the first power supply module 140 and the second power supply module 160 having the corresponding relationship in the embodiment shown in fig. 7 are respectively disposed in different areas with the first power supply module 140 in the embodiment shown in fig. 1 and are connected to the load 500 to supply power. Based on this, the plurality of first power supply modules 140 in the embodiment shown in fig. 5 or fig. 6 may be combined with the plurality of first power supply modules 140 and the plurality of second power supply modules 160 in the embodiment shown in fig. 8, which have a one-to-one correspondence, and they are respectively disposed in a plurality of different areas to supply power to the load 500.

It can be appreciated that, since the first power supply module 140 and the second power supply module 160 having the corresponding relationship are redundant backups, compared with the manner of supplying power by the independent first power supply module 140, the redundancy capability of emergency power supply is stronger, so that the first power supply module 140 and the second power supply module 160 having the corresponding relationship can be disposed in a key area, that is, in an area where the load 500 needs to continuously, stably and reliably operate, so as to ensure the stable operation of the load 500 in the area in emergency, and the independent first power supply module 140 can be disposed in an area where the operation requirement for the load 500 is relatively lower, so as to control the overall cost of the power supply system 100.

Further, in some embodiments, the rated output power of the first power supply 110 is greater than or equal to the sum of the rated output powers of all the first power supply modules 140, and the rated output power of the second power supply 150 is greater than or equal to the sum of the rated output powers of all the second power supply modules 160. The rated output power of the low-voltage power generation device 141 shared by the first power supply module 140 and the second power supply module 160 having a one-to-one correspondence is greater than or equal to the larger value of the rated output power of the first power supply module 140 and the rated output power of the second power supply module 160 where it is located. The rated output power of the low-voltage power generation devices 141 in the remaining first power supply modules 140 having no one-to-one correspondence with the second power supply modules 160 is greater than or equal to the rated output power of the first power supply module 140 in which the low-voltage power generation devices are located. The rated output power of the medium voltage power generation device 120 is greater than or equal to the larger value of the rated output power of any one group of the first power supply modules 140 and the rated output power of the second power supply modules 160, which have one-to-one correspondence, and the rated output power of the medium voltage power generation device 120 is also greater than or equal to the rated output power of any one group of the first power supply modules 140, which have no one-to-one correspondence with the second power supply modules 160.

The rated output power of the first power supply 110 is greater than or equal to the sum of the rated output powers of all the first power supply modules 140, and the rated output power of the second power supply 150 is greater than or equal to the sum of the rated output powers of all the second power supply modules 160, so that all the first power supply modules 140 can supply power to the load 500 through the first power supply 110 under the default working condition. The rated output power of the shared low-voltage power generation device 141 is greater than or equal to the larger value of the rated output power of the first power supply module 140 and the rated output power of the second power supply module 160 where the shared low-voltage power generation device 141 is located, so that the low-voltage power generation device 141 can normally supply power to the load 500 connected with the first power supply module 140 or the second power supply module 160 where the shared low-voltage power generation device is located. The rated output power of the low-voltage power generation devices 141 in the first power supply modules 140 which are not in one-to-one correspondence with the second power supply modules 160 is larger than or equal to the rated output power of the first power supply module 140 where the low-voltage power generation devices 141 are located, so that the low-voltage power generation devices 141 can normally supply power to the load 500 connected with the first power supply module 140 where the low-voltage power generation devices 141 are located. The rated output power of the medium voltage power generation device 120 is greater than or equal to the larger value of the rated output power of any one group of the first power supply modules 140 and the rated output power of the second power supply module 160, which have one-to-one correspondence, and is also greater than or equal to the rated output power of any one first power supply module 140 which has no one-to-one correspondence with the second power supply module 160, so that the medium voltage power generation device 120 can supply power to the load 500 connected with any one first power supply module 140 (whether the first power supply module 140 has one-to-one correspondence with the second power supply module 160 or not) or the second power supply module 160.

According to an aspect of the embodiments of the present application, there is provided a power supply control method applied to the power supply system 100 in any of the embodiments described above, specifically, the method is performed by the controller 130 in the power supply system 100. Referring specifically to fig. 10, a flow of a power supply control method is shown. As shown in the figure, the method comprises the steps of:

step 210: under a default working condition, the second change-over switch in the first power supply module is controlled to be in a third state, and the first change-over switch in the first power supply module is controlled to be in a first state, so that the first power supply source supplies power to the load.

Step 220: and judging whether the output voltage of the transformer in the first power supply module exceeds a first threshold range.

In this step, the controller detects and acquires the output voltage of the transformer, and then determines whether the output voltage of the transformer exceeds the first threshold range.

If the determination in step 220 is yes, step 230 is executed: and controlling the low-voltage power generation device in the first power supply module to start.

Step 240: and judging whether the output voltage of the low-voltage power generation device in the first power supply module is in a first threshold range.

If the determination in step 240 is yes, step 250 is executed: and controlling the first change-over switch in the first power supply module to be switched to the second state so as to enable the low-voltage power generation device in the first power supply module to supply power to the load.

If step 240 is negative, step 260 is executed: and judging whether the output voltage of the first power supply exceeds a second threshold range.

If step 260 determines yes, step 270 is executed: and controlling the medium-voltage power generation device to start.

Step 280: and judging whether the output voltage of the medium-voltage power generation device is in a second threshold range or not.

If the determination in step 280 is yes, step 290 is performed: and controlling the second change-over switch in the first power supply module to be switched to a fourth state, and switching the first change-over switch in the first power supply module to be switched to a first state so as to enable the medium-voltage power generation device in the first power supply module to supply power to the load.

In the power supply control method provided by the embodiment of the application, the low-voltage power generation device is switched to supply power by priority, so that the characteristic of high response speed of the low-voltage power generation device is fully utilized, and the low-voltage power generation device can be ensured to be connected into a load to supply power quickly when a first power supply fails. In order to ensure reliable redundancy, the medium voltage power generation device can also supply power to the load by controlling the first and second transfer switches to transfer control when the low voltage power generation device fails. In the power supply control method, the first power supply source is controlled to supply power to the load under the default working condition, the three working conditions of the priority control switching low-voltage power generation device for power supply and the secondary control switching medium-voltage power generation device for power supply enable the power supply system to be fully and reliably redundant, emergency capacity of the power supply system is improved, and normal power supply to loads is guaranteed.

Referring to fig. 11, the sub-steps of

steps

230, 260 and 270 are shown. As shown in the figures, in some embodiments, the step 230 includes the steps of:

step 231: and judging whether the duration that the output voltage of the transformer in the first power supply module exceeds the first threshold range is greater than a first time threshold.

Specifically, in this step, the controller records a duration that the output voltage of the transformer exceeds the first threshold range, and determines whether the duration exceeds the first time threshold in the process of recording the duration.

If the determination in step 231 is yes, step 232 is executed: and controlling the low-voltage power generation device in the first power supply module to start.

The step 260 includes the steps of:

step 261: and judging whether the duration that the output voltage of the low-voltage power generation device in the first power supply module exceeds the first threshold range is greater than a second time threshold.

If step 261 is yes, step 262 is executed: and judging whether the output voltage of the first power supply exceeds a second threshold range.

The step 270 includes the steps of:

step 271: and judging whether the duration that the output voltage of the first power supply exceeds the second threshold range is greater than a third time threshold.

If step 271 is yes, step 272 is executed: and controlling the medium-voltage power generation device to start.

When the output voltage of the transformer exceeds the first threshold range and the duration time is longer than the first time threshold, the low-voltage power generation device in the first power supply module is controlled to be started, so that when the voltage in the power supply circuit of the first power supply source fluctuates briefly, the low-voltage power generation device is not directly controlled to be started, the situation of frequent switching is prevented, and only when the output voltage of the transformer fluctuates for a long time (namely, the duration time is longer than the first time threshold), the low-voltage power generation device is controlled to be connected for power supply. The access control of the medium-voltage power generation device is the same as that of the medium-voltage power generation device, so that the controller is prevented from frequently starting the medium-voltage power generation device and accessing to supply power when the output voltage of the low-voltage power generation device fluctuates briefly.

In some embodiments, the power supply system further includes a second power supply and a second power supply module, the second power supply module has the same structure as the first power supply module, and a connection manner between the second power supply and the second power supply module is the same as a connection manner between the first power supply and the first power supply module; the first power supply module and the second power supply module share the low-voltage power generation device and the medium-voltage power generation device, the output end of the first change-over switch in the first power supply module and the output end of the first change-over switch in the second power supply module are commonly used for being connected with a load, and the output end of the first change-over switch in the first power supply module and the output end of the first change-over switch in the second power supply module are redundant backups. Referring to fig. 12, a sub-step of step 210 and steps subsequent to the sub-step are shown. As shown in the figure, the above step 210 includes the steps of:

Step 211: under a default working condition, the second change-over switch in the first power supply module and the second power supply module is controlled to be in a third state, and the first change-over switch in the first power supply module and the second power supply module is controlled to be in a first state, so that the first power supply module outputs power by the first power supply, the second power supply module outputs power by the second power supply, and the first power supply and the second power supply power to a load together.

After step 211, the power supply control method further includes the following steps (it should be noted that, there is no sequence relationship between the following steps and the above step 220 and the following steps, and the two steps are mutually independent branches, and the two steps are respectively and independently executed in sequence):

step 320: and judging whether the output voltage of the transformer in the second power supply module exceeds a first threshold range.

If step 320 is yes, step 330 is executed: and controlling the low-voltage power generation device in the second power supply module to start.

Step 340: and judging whether the output voltage of the low-voltage power generation device in the second power supply module is in a first threshold range.

If step 340 determines yes, step 350 is executed: and controlling the first change-over switch in the second power supply module to be switched to a second state so as to enable the low-voltage power generation device in the second power supply module to supply power to the load.

If step 340 is negative, step 360 is performed: and judging whether the output voltage of the second power supply exceeds a second threshold range.

If step 360 determines yes, then step 370 is performed: and controlling the medium-voltage power generation device to start.

Step 380: and judging whether the output voltage of the medium-voltage power generation device is in a second threshold range or not.

If the determination in step 380 is yes, step 390 is executed: and controlling a second change-over switch in the second power supply module to be switched to a fourth state, and switching the first change-over switch in the second power supply module to be switched to a first state so as to enable the medium-voltage power generation device in the second power supply module to supply power to the load.

The control logic of the second power supply module is the same as that of the first power supply module, and the control logic of the second power supply module and the control logic of the first power supply module are mutually independent, so that the first power supply module and the second power supply module form 2N redundancy (N is a smaller value of rated power supply capacity output by the first power supply module and the second power supply module which are in one-to-one correspondence), and when one of the first power supply module and the second power supply module fails, the other power supply module can still be controlled to supply reliable power to a load, and the power supply system has more reliable emergency capability.

Further, referring to fig. 13, the sub-steps of

steps

330, 360 and 370 are shown. As shown in the figures, in some embodiments, the step 330 includes the steps of:

Step 331: and judging whether the duration that the output voltage of the transformer in the second power supply module exceeds the first threshold range is greater than a first time threshold.

If step 331 determines that it is yes, step 332 is executed: and controlling the low-voltage power generation device in the second power supply module to start.

The step 360 includes the steps of:

step 361: and judging whether the duration that the output voltage of the low-voltage power generation device in the second power supply module exceeds the first threshold range is greater than a second time threshold.

If step 361 is yes, step 362 is executed: and judging whether the output voltage of the second power supply exceeds a second threshold range.

The step 370 includes the steps of:

step 371: and judging whether the duration that the output voltage of the second power supply exceeds the second threshold range is greater than a third time threshold.

If step 371 is yes, step 372 is executed: and controlling the medium-voltage power generation device to start.

When the output voltage of the transformer in the second power supply module exceeds the first threshold range and the duration time is longer than the first time threshold, the low-voltage power generation device in the second power supply module is controlled to be started, so that when the voltage in the power supply circuit of the second power supply source fluctuates briefly, the low-voltage power generation device in the second power supply module is not directly controlled to be started, frequent switching is prevented, and only when the output voltage of the transformer in the second power supply module fluctuates for a long time (namely, the duration time is longer than the first time threshold), the low-voltage power generation device in the second power supply module is controlled to be connected for power supply. The access control of the medium-voltage power generation device is the same as that of the medium-voltage power generation device, so that the controller is prevented from frequently starting the medium-voltage power generation device and accessing the second power supply module to supply power when the output voltage of the low-voltage power generation device fluctuates temporarily.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A power supply system, comprising: the system comprises a first power supply source, a medium-voltage power generation device, a controller and a first power supply module;

the first power supply module includes: the low-voltage power generation device, the transformer, the first change-over switch and the second change-over switch;

The medium-voltage power generation device, the low-voltage power generation device, the first change-over switch and the second change-over switch are all in signal connection with the controller;

the two input ends of the second change-over switch are respectively connected with the output ends of the first power supply and the medium-voltage power generation device, and the output end of the second change-over switch is connected with the input end of the transformer; the two input ends of the first change-over switch are respectively connected with the low-voltage power generation device and the output end of the transformer, and the output end of the first change-over switch is used for being connected with a load;

the first switch is configured to have a first state and a second state; in the first state, only the input end connected with the transformer in the first change-over switch is conducted; in the second state, only the input end connected with the low-voltage power generation device in the first change-over switch is conducted;

the second change-over switch is configured to have a third state and a fourth state; in the third state, only the input end of the second change-over switch connected with the first power supply is conducted; in the fourth state, only the input end of the second change-over switch connected with the medium-voltage power generation device is conducted;

The controller is used for controlling the second change-over switch in the first power supply module to be in the third state under a default working condition, and the first change-over switch in the first power supply module is in the first state so that the first power supply source supplies power to the load;

the controller is configured to control the low-voltage power generation device in the first power supply module to start when the output voltage of the transformer in the first power supply module exceeds a first threshold range, and control the first switch in the first power supply module to switch to the second state when the output voltage of the low-voltage power generation device in the first power supply module is within the first threshold range, so that the low-voltage power generation device in the first power supply module supplies power to the load;

the controller is used for controlling the medium voltage power generation device to start when the output voltage of the low voltage power generation device in the first power supply module exceeds the first threshold range and the output voltage of the first power supply source exceeds the second threshold range, and controlling the second change-over switch in the first power supply module to switch to the fourth state when the output voltage of the medium voltage power generation device is in the second threshold range, and the first change-over switch in the first power supply module is switched to the first state so that the medium voltage power generation device in the first power supply module supplies power to the load.

2. The power supply system according to claim 1, wherein the controller is configured to control the low-voltage power generation device in the first power supply module to start when the output voltage of the transformer in the first power supply module exceeds the first threshold range and lasts longer than a first time threshold;

the controller is used for controlling the medium-voltage power generation device to start when the output voltage of the low-voltage power generation device in the first power supply module exceeds the first threshold range and the duration is longer than a second time threshold after the low-voltage power generation device in the first power supply module is started, and the output voltage of the first power supply exceeds the second threshold range and the duration is longer than a third time threshold.

3. The power supply system of claim 1, wherein the number of first power supply modules is a plurality.

4. A power supply system according to claim 3, wherein the rated output power of the first power supply is greater than or equal to the sum of the rated output powers of all the first power supply modules; the rated output power of the low-voltage power generation device is larger than or equal to the rated output power of the first power supply module in which the low-voltage power generation device is positioned; and rated output power of the medium-voltage power generation device is larger than or equal to rated output power of any one of the first power supply modules.

5. A power supply system according to claim 3, wherein the number of said medium voltage power generating means is plural and the outputs of the plural said medium voltage power generating means are connected to the same input of each said second change-over switch.

6. The power supply system according to claim 1, further comprising a second power supply source and a second power supply module, wherein the second power supply module has the same structure as the first power supply module, the connection mode between the controller and the second power supply module is the same as the connection mode between the controller and the first power supply module, and the connection mode between the second power supply source and the second power supply module is the same as the connection mode between the first power supply source and the first power supply module;

the low-voltage power generation device and the medium-voltage power generation device are shared by the first power supply module and the second power supply module, the output end of the first change-over switch in the first power supply module and the output end of the first change-over switch in the second power supply module are used for being connected with the load together, and the output end of the first change-over switch in the first power supply module and the output end of the first change-over switch in the second power supply module are in mutual redundancy backup;

The control mode of the controller on the second power supply module is the same as the control mode of the controller on the first power supply module.

7. The power supply system of claim 6, wherein the first power supply module and the second power supply module are the same in number and are each a plurality of;

the first power supply modules and the second power supply modules are arranged in one-to-one correspondence, and the corresponding first power supply module and the second power supply module share one low-voltage power generation device;

and all the first power supply modules and all the second power supply modules share at least one medium voltage power generation device.

8. The power supply system according to claim 7, wherein the rated output power of the first power supply is greater than or equal to the sum of the rated output powers of all the first power supply modules, and the rated output power of the second power supply is greater than or equal to the sum of the rated output powers of all the second power supply modules; the rated output power of the low-voltage power generation device is larger than or equal to the larger value of the rated output power of the first power supply module and the rated output power of the second power supply module; the rated output power of the medium-voltage power generation device is larger than or equal to the larger value of the rated output power of any group of the first power supply module and the rated output power of the second power supply module, wherein the rated output power of the medium-voltage power generation device and the rated output power of the second power supply module are in one-to-one correspondence.

9. The power supply system of claim 6, wherein the number of first power supply modules is greater than the number of second power supply modules;

all the first power supply modules and all the second power supply modules share at least one medium-voltage power generation device;

the rest of the first switch switches in the first power supply modules which have no one-to-one correspondence with the second power supply modules are used for being connected with the load independently.

10. The power supply system according to claim 9, wherein the rated output power of the first power supply is greater than or equal to the sum of the rated output powers of all the first power supply modules, and the rated output power of the second power supply is greater than or equal to the sum of the rated output powers of all the second power supply modules; the rated output power of the low-voltage power generation device shared by the first power supply module and the second power supply module with one-to-one correspondence is larger than or equal to the larger value of the rated output power of the first power supply module and the rated output power of the second power supply module where the rated output power of the low-voltage power generation device is located; the rated output power of the low-voltage power generation devices in the rest first power supply modules which do not have one-to-one correspondence with the second power supply modules is larger than or equal to the rated output power of the first power supply modules in which the low-voltage power generation devices are located; the rated output power of the medium-voltage power generation device is larger than or equal to the larger value of the rated output power of any one group of the first power supply module and the rated output power of the second power supply module, which have one-to-one correspondence, and the rated output power of the medium-voltage power generation device is also larger than or equal to the rated output power of any one group of the first power supply module, which has no one-to-one correspondence with the second power supply module.

11. A power supply control method, characterized by being applied to the power supply system according to any one of claims 1 to 10, the method comprising:

under a default working condition, controlling the second change-over switch in the first power supply module to be in the third state, and enabling the first change-over switch in the first power supply module to be in the first state so as to enable the first power supply to supply power to the load;

judging whether the output voltage of the transformer in the first power supply module exceeds the first threshold range;

if yes, the low-voltage power generation device in the first power supply module is controlled to start;

judging whether the output voltage of the low-voltage power generation device in the first power supply module is within the first threshold range or not;

if yes, controlling the first switching switch in the first power supply module to switch to the second state, so that the low-voltage power generation device in the first power supply module supplies power to the load;

if not, judging whether the output voltage of the first power supply exceeds the second threshold range;

if yes, controlling the medium-voltage power generation device to start;

judging whether the output voltage of the medium-voltage power generation device is in the second threshold range or not;

If yes, the second change-over switch in the first power supply module is controlled to be switched to the fourth state, and the first change-over switch in the first power supply module is switched to the first state, so that the medium voltage power generation device in the first power supply module supplies power to the load.

12. The power supply control method according to claim 11, wherein if yes, controlling the low-voltage power generation device in the first power supply module to start includes:

if yes, judging whether the duration of the output voltage of the transformer in the first power supply module exceeding the first threshold range is greater than a first time threshold;

if not, judging whether the output voltage of the first power supply exceeds the second threshold range, including:

if not, judging whether the duration of the output voltage of the low-voltage power generation device in the first power supply module exceeding the first threshold range is greater than a second time threshold;

if yes, judging whether the output voltage of the first power supply exceeds the second threshold range;

And if yes, controlling the medium-voltage power generation device to start, including:

if yes, judging whether the duration of the output voltage of the first power supply exceeding the second threshold range is greater than a third time threshold;

if yes, the medium-voltage power generation device is controlled to start.

13. The power supply control method according to claim 11 or 12, characterized in that the power supply system further includes a second power supply source and a second power supply module, the second power supply module has the same structure as the first power supply module, and the connection manner between the second power supply source and the second power supply module is the same as the connection manner between the first power supply source and the first power supply module; the low-voltage power generation device and the medium-voltage power generation device are shared by the first power supply module and the second power supply module, the output end of the first change-over switch in the first power supply module and the output end of the first change-over switch in the second power supply module are used for being connected with the load together, and the output end of the first change-over switch in the first power supply module and the output end of the first change-over switch in the second power supply module are in mutual redundancy backup;

Under a default working condition, the second change-over switch in the first power supply module is controlled to be in the third state, the first change-over switch in the first power supply module is in the first state, so that the first power supply source supplies power to the load, and the method comprises the following steps:

under a default working condition, controlling the second change-over switches in the first power supply module and the second power supply module to be in the third state, wherein the first change-over switches in the first power supply module and the second power supply module are in the first state so that the first power supply in the first power supply module outputs power, the second power supply module outputs power from the second power supply power, and the first power supply and the second power supply power to the load together;

under a default working condition, the second change-over switches in the first power supply module and the second power supply module are controlled to be in the third state, and the first change-over switches in the first power supply module and the second power supply module are controlled to be in the first state, so that the first power supply outputs power in the first power supply module, the second power supply outputs power in the second power supply module, and after the first power supply and the second power supply power to the load together, the method further comprises the steps of:

Judging whether the output voltage of the transformer in the second power supply module exceeds the first threshold range;

if yes, the low-voltage power generation device in the second power supply module is controlled to start;

judging whether the output voltage of the low-voltage power generation device in the second power supply module is within the first threshold range or not;

if yes, controlling the first switching switch in the second power supply module to switch to the second state, so that the low-voltage power generation device in the second power supply module supplies power to the load;

if not, judging whether the output voltage of the second power supply exceeds the second threshold range;

if yes, controlling the medium-voltage power generation device to start;

if yes, the second change-over switch in the second power supply module is controlled to be switched to the fourth state, and the first change-over switch in the second power supply module is controlled to be switched to the first state, so that the medium voltage power generation device in the second power supply module supplies power to the load.

14. The power supply control method according to claim 13, wherein if yes, controlling the low-voltage power generation device in the second power supply module to start includes:

If yes, judging whether the duration of the output voltage of the transformer in the second power supply module exceeding the first threshold range is greater than a first time threshold;

if not, judging whether the output voltage of the second power supply exceeds the second threshold range, including:

if not, judging whether the duration of the output voltage of the low-voltage power generation device in the second power supply module exceeding the first threshold range is greater than a second time threshold;

if yes, judging whether the output voltage of the second power supply exceeds the second threshold range;

if yes, judging whether the duration of the output voltage of the second power supply exceeding the second threshold range is greater than a third time threshold;

if yes, the medium-voltage power generation device is controlled to start.