CN112787392A

CN112787392A - Alternating current-direct current power supply and system

Info

Publication number: CN112787392A
Application number: CN202110105804.8A
Authority: CN
Inventors: 辛绪武; 陈振; 彭丽巧; 和海渔; 李佳霖
Original assignee: Beijing Institute of Technology BIT; Beijing Dynamic Power Co Ltd
Current assignee: Beijing Institute of Technology BIT; Beijing Dynamic Power Co Ltd
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2021-05-11

Abstract

The embodiment of the application provides an alternating current-direct current power supply and system, and this power includes: the alternating current-direct current conversion device is provided with a first direct current bus bar; the direct current switch array comprises a plurality of direct current switches and a plurality of first fuses corresponding to the direct current switches, the direct current switches are connected to the first direct current bus bar, and each first fuse is correspondingly connected to each direct current switch; a plurality of DC/DC converters corresponding to a plurality of the first fuses, each of the DC/DC converters being connected to one of the first fuses; and the output ends of the plurality of DC/DC converters are connected in parallel and then connected to the second direct current bus bar. According to the method and the device, when the DC/DC converter breaks down, normal power supply to the load is not influenced, or the load is changed, overhauled and stopped, the DC/DC converter can be disconnected on line or repeatedly switched.

Description

Alternating current-direct current power supply and system

Technical Field

The embodiment of the application relates to the technical field of power supplies, in particular to an alternating current-direct current power supply and a system.

Background

The large and medium-sized data centers are used as core infrastructure for informatization construction of various industries such as communication operators, bank service industry, large-scale business group companies and the like, bear important work such as storage, transmission, exchange, management, processing and the like of mass data, and the continuity and stability of normal operation of the business must be ensured. For example, if an abnormal power interruption is encountered for even as little as 1 second, the traffic carried on the IT equipment may be interrupted for several hours. Because the powered-off IT equipment is restarted, hardware failure is checked, data loss is checked, and service is reloaded, a series of actions is performed for at least several hours. Therefore, the reliability of the power supply and distribution system of each data center is of great importance, and the individual devices forming the power supply and distribution system are also of great importance.

Disclosure of Invention

In order to ensure uninterrupted power supply to a load, the embodiment of the application provides an alternating current/direct current power supply and a system.

In a first aspect of the present application, there is provided an ac/dc power supply, comprising: the alternating current-direct current conversion device is provided with a first direct current bus bar; the direct current switch array comprises a plurality of direct current switches and a plurality of first fuses corresponding to the direct current switches, the direct current switches are connected to the first direct current bus bar, and each first fuse is correspondingly connected to each direct current switch; a plurality of DC/DC converters corresponding to a plurality of the first fuses, each of the DC/DC converters being connected to one of the first fuses; and the output ends of the plurality of DC/DC converters are connected in parallel and then connected to the second direct current bus bar.

In an alternative implementation, the ac-dc conversion device includes: the phase-shifting transformer is provided with a plurality of groups of edge-extended triangular phase-shifting windings, and the groups of edge-extended triangular phase-shifting windings correspond to the plurality of DC/DC converters; the alternating current switch array comprises a plurality of three-phase alternating current switches corresponding to a plurality of groups of the edge-extended triangular phase-shifting windings and a plurality of second fuses corresponding to the three-phase alternating current switches, each three-phase alternating current switch is connected to each edge-extended triangular phase-shifting winding, and each second fuse is correspondingly connected to each three-phase alternating current switch; a plurality of AC/DC converters corresponding to a plurality of the second fuses, each of the AC/DC converters being connected to one of the second fuses; and the output ends of the AC/DC converters are connected in parallel and then connected to the first direct current bus bar.

In a second aspect of the present application, there is provided a system comprising the ac/DC power supply according to the first aspect, further comprising a controller connected to all DC/DC converters, all DC switches, and all first fuses in the ac/DC power supply, the controller being configured to: when a certain DC/DC converter has a fault, blocking the output of the DC/DC converter, opening a direct current switch corresponding to the DC/DC converter, and simultaneously waking up the DC/DC converter which is not in a working state; when one first fuse is blown, the direct current switch corresponding to the first fuse is opened.

In an alternative implementation, the system further comprises a Human Machine Interface (HMI) device connected to the controller, the HMI device configured to control the controller to implement: when a certain DC/DC converter has a fault, blocking the output of the DC/DC converter, opening a direct current switch corresponding to the DC/DC converter, and simultaneously waking up the DC/DC converter which is not in a working state; when one first fuse is blown, the direct current switch corresponding to the first fuse is opened.

In an alternative implementation, the controller is connected to all DC/DC converters, all DC switches, and all first fuses in the ac/DC power supply via a CAN bus.

In a third aspect of the present application, there is provided a system comprising the AC/DC power supply according to the first aspect, further comprising a controller connected to all AC/DC converters, all DC/DC converters, all three-phase alternating current switches, and all direct current switches in the AC/DC power supply, the controller being configured to: when a certain AC/DC converter fails, the output of the AC/DC converter is blocked, a three-phase alternating current switch corresponding to the AC/DC converter is opened, and meanwhile, other AC/DC converters in the working state are controlled to release redundant capacity, or other AC/DC converters in the working state are controlled to release redundant capacity, and AC/DC converters not in the working state are awakened; when a certain DC/DC converter has a fault, blocking the output of the DC/DC converter, opening a direct current switch corresponding to the DC/DC converter, and simultaneously waking up the DC/DC converter which is not in a working state; when a certain first fuse is fused, opening a direct current switch corresponding to the first fuse; when one second fuse blows, the three-phase alternating current switch corresponding to the second fuse is opened.

In an alternative implementation, the system further comprises a Human Machine Interface (HMI) device connected to the controller, the HMI device configured to control the controller to implement: when a certain AC/DC converter fails, the output of the AC/DC converter is blocked, a three-phase alternating current switch corresponding to the AC/DC converter is opened, and meanwhile, other AC/DC converters in the working state are controlled to release redundant capacity, or other AC/DC converters in the working state are controlled to release redundant capacity, and AC/DC converters not in the working state are awakened; when a certain DC/DC converter has a fault, blocking the output of the DC/DC converter, opening a direct current switch corresponding to the DC/DC converter, and simultaneously waking up the DC/DC converter which is not in a working state; when a certain first fuse is fused, opening a direct current switch corresponding to the first fuse; when one second fuse blows, the three-phase alternating current switch corresponding to the second fuse is opened.

In an alternative implementation, the controller is connected to all AC/DC converters, all DC/DC converters, all three-phase AC switches, and all DC switches in the AC/DC power supply via a CAN bus.

In the alternating-current and direct-current power supply and the system provided by the embodiment of the application, the direct-current switch array is arranged between the DC/DC converter and the second direct-current bus bar, so that when the DC/DC converter fails, the normal power supply to a load is not influenced, or when the load is changed, overhauled and stopped, the DC/DC converter can be disconnected or repeatedly switched on line.

It should be understood that what is described in this summary section is not intended to limit key or critical features of the embodiments of the application, nor is it intended to limit the scope of the application. Other features of the present application will become apparent from the following description.

Drawings

The above and other features, advantages and aspects of various embodiments of the present application will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, like or similar reference characters designate like or similar elements, and wherein:

fig. 1 shows a schematic structural diagram of an ac/dc power supply according to an embodiment of the present application.

Fig. 2 shows an architecture diagram of a ac-dc power supply system according to an embodiment of the present application.

Wherein: 1. a phase-shifting transformer; 2. a three-phase AC switch; 3. a first fuse; 4. an AC/DC converter; 5. a first direct current bus bar; 6. a DC switch; 7. a second fuse; 8. a DC/DC converter; 9. a second direct current bus bar; 10. a controller; 11. a Human Machine Interface (HMI) device.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 shows a schematic structural diagram of an ac/dc power supply according to an embodiment of the present application. As shown in fig. 1, the AC/DC power supply includes an AC/DC power supply device including a phase-shifting transformer 1, an AC array switch, a plurality of AC/DC converters 4, and a first DC bus bar 5. Wherein the ac array switch comprises a plurality of three-phase ac switches 2 and a plurality of first fuses 3.

Specifically, the secondary side of the phase-shifting transformer 1 is provided with a plurality of groups of edge-extending triangular phase-shifting windings, each edge-extending triangular phase-shifting winding is connected with one three-phase alternating-current switch 2, each three-phase alternating-current switch 2 is connected with one second fuse 7, each second fuse 7 is connected with one AC/DC converter 4, and the output ends of the AC/DC converters 4 are connected to the first direct-current bus bar 5 after being connected in parallel.

In a possible implementation manner, the running state of the alternating current/direct current power supply device can be monitored in real time by acquiring the voltage, the current and the temperature of the alternating current/direct current power supply device in real time. It should be noted that, collecting the voltage, the current and the temperature of the ac/dc power supply device can be realized by arranging a voltage collecting module, a current collecting module and a temperature collecting module on the ac/dc power supply device.

Usually, when each AC/DC converter 4 is operating normally, its output capacity does not reach its maximum output capacity, for example, its output capacity is 80% of its maximum capacity, when a fault occurs in a certain AC/DC converter 4, the output capacity of the other AC/DC converters 4 operating normally can be increased, so that the output capacity of the AC/DC power supply source meets the capacity required by the load, and if the output capacities of the other AC/DC converters 4 operating normally are increased to the maximum output capacity, the capacity required by the load is not yet met, the AC/DC converter 4 not operating normally can be woken up.

In this process, it is also necessary to simultaneously block the output of the failed AC/DC converter 4 and open the three-phase AC switch 2 corresponding to the failed AC/DC converter 4 to disconnect the failed AC/DC converter 4, so that other parts can still work normally, and it is ensured that the power supply of the load is not affected by the AC/DC converter 4 when the failure is disconnected.

After the disconnected AC/DC converters 4 are replaced, the three-phase AC switches 2 corresponding to the AC/DC converters 4 may be closed to operate normally, and the output capacities of all the AC/DC converters 4 may be adjusted to the capacities required by the loads.

Of course, when a short-circuit fault occurs in a certain AC/DC converter 4 and its subsequent circuit, the second fuse 7 corresponding to the AC/DC converter 4 will be blown in time, and after the second fuse 7 is blown, the three-phase AC switch 2 corresponding to the second fuse 7 is opened to detect the AC/DC converter 4 and its subsequent circuit, and in order to ensure that the output capacity required by the load can be satisfied during this period, the processing method is the same as the processing method for the fault occurrence of the AC/DC converter 4, and the description thereof is omitted here.

With continued reference to fig. 1, the ac/DC power supply further includes a DC switch array, a plurality of DC/DC converters 8, and a second DC bus bar 9. Wherein the dc switch array comprises a plurality of dc switches 6 and a plurality of first fuses 3.

Specifically, a plurality of direct current switches 6 are connected to a first direct current bus bar 5, each direct current switch 6 is connected to one first fuse 3, each first fuse 3 is connected to one DC/DC converter 8, and output ends of the plurality of DC/DC converters 8 are connected to a second direct current bus bar 9 after being connected in parallel.

Normally, when the ac/DC power supply supplies power to the load, not all the DC/DC converters 8 are in an operating state, but some of the DC/DC converters 8 are in a non-operating state to serve as redundant DC/DC converters, and when a certain DC/DC converter 8 fails, the redundant DC/DC converter 8 may be waken up, the DC switch 6 corresponding to the failed DC/DC converter 8 may be turned on, and the output of the failed DC/DC converter 8 may be blocked to disconnect the failed DC/DC converter 8, and the failed DC/DC converter 8 may be replaced, and after replacement, the redundant DC/DC converter may be used as a redundant DC/DC converter to wait for wakening up.

When the user load needs to be overhauled and shut down, all the DC/DC converters 8 can be disconnected by opening all the DC switches 6, and after the overhauling and the shut down are completed, all the DC switches 6 can be closed, so that all the DC/DC converters 8 are repeatedly switched on to normally supply power to the load.

Of course, when a short-circuit fault occurs in a certain DC/DC converter 8 and its subsequent circuit, the first fuse 3 corresponding to the DC/DC converter 8 will be blown in time, and after the first fuse 3 is blown, the DC switch 6 corresponding to the first fuse 3 is opened to detect the DC/DC converter 8 and its subsequent circuit, and in order to ensure that the output capacity required by the load can be satisfied during this period, the processing manner is the same as the processing manner for the DC/DC converter 8 to have a fault, and the description thereof is omitted.

In the embodiment of the present application, the phase-shifting transformer 1 may be a dry-type phase-shifting transformer, which is different from the conventional ac/dc converter directly connected to the power grid bus, the ac/dc converter in the embodiment of the present application directly connects the three-phase high-voltage power from the power grid to the primary side of the dry-type phase-shifting transformer, and the primary side of the dry-type phase-shifting transformer is configured with ± 5% taps, so that the user can flexibly adjust the input voltage according to the on-site grid voltage.

In the embodiment of the application, the on-line replacement of the DC/DC converter can be realized through two decoupling of the plurality of AC/DC converters and the alternating current switch array and the plurality of DC/DC converters and the direct current switch array, so that the phase-shifting transformer and the secondary winding thereof are not influenced by load change, maintenance and shutdown of users and different groups of load, and the balance of secondary output of the phase-shifting transformer and the balance of magnetic copper in the secondary output of the phase-shifting transformer are ensured.

Fig. 2 shows an architecture diagram of a ac-dc power supply system according to an embodiment of the present application. As shown in fig. 2, the system includes the AC/DC power supply and the controller 10, and the controller 10 is connected to all the AC/DC converters 4, all the DC/DC converters 8, all the three-phase AC switches 2, and all the DC switches 6 in the AC/DC power supply.

The controller 10 is configured to: when a certain AC/DC converter 4 has a fault, the output of the AC/DC converter 4 is blocked, the three-phase alternating current switch 2 corresponding to the AC/DC converter 4 is opened, and meanwhile, other AC/DC converters 4 in the working state are controlled to release redundant capacity, or other AC/DC converters 4 in the working state are controlled to release redundant capacity, and the AC/DC converters 4 which are not in the working state are awakened; when a certain DC/DC converter 8 has a fault, blocking the output of the DC/DC converter 8, opening the direct current switch 6 corresponding to the DC/DC converter 8, and simultaneously waking up the DC/DC converter 8 which is not in the working state; when a certain first fuse 3 is fused, opening a direct current switch 6 corresponding to the first fuse 3; when a certain second fuse 7 is blown, the three-phase ac switch 2 corresponding to the second fuse 7 is opened.

In some embodiments, the system further comprises a Human Machine Interface (HMI) device 11 connected to the controller 10, the HMI device 11 being configured to control the controller to implement: when a certain AC/DC converter 4 has a fault, the output of the AC/DC converter 4 is blocked, the three-phase alternating current switch 2 corresponding to the AC/DC converter 4 is opened, and meanwhile, other AC/DC converters 4 in the working state are controlled to release redundant capacity, or other AC/DC converters 4 in the working state are controlled to release redundant capacity, and the AC/DC converters 4 which are not in the working state are awakened; when a certain DC/DC converter 8 has a fault, blocking the output of the DC/DC converter 8, opening the direct current switch 6 corresponding to the DC/DC converter 8, and simultaneously waking up the DC/DC converter 8 which is not in the working state; when a certain first fuse 3 is fused, opening a direct current switch 6 corresponding to the first fuse 3; when a certain second fuse 7 is blown, the three-phase ac switch 2 corresponding to the second fuse 7 is opened.

In some embodiments, the controller 10 is connected to all of the AC/DC converters 4, all of the DC/DC converters 8, all of the three-phase AC switches 2, and all of the DC switches 6 in the AC/DC power supply via the CAN bus.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the application referred to in the present application is not limited to the embodiments with a particular combination of the above-mentioned features, but also encompasses other embodiments with any combination of the above-mentioned features or their equivalents without departing from the spirit of the application. For example, the above features may be replaced with (but not limited to) features having similar functions as those described in this application.

Claims

1. An AC/DC power supply, comprising:

the alternating current-direct current conversion device is provided with a first direct current bus bar;

the direct current switch array comprises a plurality of direct current switches and a plurality of first fuses corresponding to the direct current switches, the direct current switches are connected to the first direct current bus bar, and each first fuse is correspondingly connected to each direct current switch;

a plurality of DC/DC converters corresponding to a plurality of the first fuses, each of the DC/DC converters being connected to one of the first fuses;

and the output ends of the plurality of DC/DC converters are connected in parallel and then connected to the second direct current bus bar.

2. The ac-dc power supply according to claim 1, wherein the ac-dc converter comprises:

the phase-shifting transformer is provided with a plurality of groups of edge-extended triangular phase-shifting windings, and the groups of edge-extended triangular phase-shifting windings correspond to the plurality of DC/DC converters;

the alternating current switch array comprises a plurality of three-phase alternating current switches corresponding to a plurality of groups of the edge-extended triangular phase-shifting windings and a plurality of second fuses corresponding to the three-phase alternating current switches, each three-phase alternating current switch is connected to each edge-extended triangular phase-shifting winding, and each second fuse is correspondingly connected to each three-phase alternating current switch;

a plurality of AC/DC converters corresponding to a plurality of the second fuses, each of the AC/DC converters being connected to one of the second fuses;

and the output ends of the AC/DC converters are connected in parallel and then connected to the first direct current bus bar.

3. A system comprising the ac-DC power supply of claim 1, further comprising a controller connected to all DC/DC converters, all DC switches, and all first fuses in the ac-DC power supply, the controller configured to:

when a certain DC/DC converter has a fault, blocking the output of the DC/DC converter, opening a direct current switch corresponding to the DC/DC converter, and simultaneously waking up the DC/DC converter which is not in a working state;

when one first fuse is blown, the direct current switch corresponding to the first fuse is opened.

4. The system of claim 3, further comprising a Human Machine Interface (HMI) device connected to the controller, the HMI device configured to control the controller to implement:

5. The system of claim 3, wherein the controller is connected to all DC/DC converters, all DC switches, and all first fuses in the AC/DC power supply via a CAN bus.

6. A system comprising the AC-DC power supply of claim 2, further comprising a controller connected to all of the AC/DC converters, all of the DC/DC converters, all of the three-phase AC switches, and all of the DC switches in the AC-DC power supply, the controller configured to:

when a certain AC/DC converter fails, the output of the AC/DC converter is blocked, and a three-phase alternating current switch corresponding to the AC/DC converter is opened, and simultaneously

Control other AC/DC converters in operation to release redundant capacity, or

Controlling other AC/DC converters in the working state to release redundant capacity and awakening the AC/DC converters which are not in the working state;

when a certain first fuse is fused, opening a direct current switch corresponding to the first fuse;

when one second fuse blows, the three-phase alternating current switch corresponding to the second fuse is opened.

7. The system of claim 6, further comprising a Human Machine Interface (HMI) device connected to the controller, the HMI device configured to control the controller to implement:

Control other AC/DC converters in operation to release redundant capacity, or

8. The system of claim 6, wherein the controller is connected to all of the AC/DC converters, all of the DC/DC converters, all of the three-phase AC switches, and all of the DC switches in the AC/DC power supply via a CAN bus.