CN115398769B - Multi-loop power supply redundant power supply system and power distribution device - Google Patents

Abstract

Embodiments of the present application provide a multi-loop power supply redundant power supply system and a power distribution device. The multi-loop power supply redundant power system includes M power supply loops, where M is a natural number greater than 1. Each power supply loop includes: an input power supply, a power distribution cabinet, and at least two ring network cabinets. The output end of the input power supply is connected to the input end of the power distribution cabinet. The ring network cabinet includes at least two input ends, and at least two The input ends of the ring network cabinet are connected to form a chain structure, and are connected to the output end of the power distribution cabinet to form a power supply loop. The redundant power supply system of this application also includes at least one group of power distribution modules. Each group of power distribution modules includes M power distribution modules corresponding to M power supply loops. The input of each power distribution module The terminal is connected to the output terminal of a ring network cabinet in the corresponding power supply loop; each power distribution module is used to provide redundant power supply to the load.

Description

Multi-loop power supply redundant power supply system and power distribution device

Technical field

The present application relates to the field of power supply, and more specifically, to a multi-loop power supply redundant power supply system and a power distribution device.

Background technique

At present, for power supply solutions in data centers, considering the safety of power supply, the power supply system of the data center often adopts a redundant design, that is, where the power supply system plays a key role in completing the task, more than one set of functions that complete the same function are added. Channels, working components or parts to ensure that when this part fails, the system or equipment can still work normally and reduce the probability of system or equipment failure. For example, multiple UPS (Uninterruptable Power System, uninterruptible power supply equipment) groups are usually set up in the power supply system, and multiple UPS groups provide single-channel power supply or multi-channel power supply for the loads in multiple computer rooms. In the same power supply system, Achieve multiple power supplies within the system. In the redundant power supply system of existing data centers, power distribution cabinets are generally used to provide power to several power distribution modules. The input terminals of the power distribution modules are often equipped with ATS (Automatic Transfer Switching Equipment) to provide power supply input. Path redundancy often requires additional circuit breakers in distribution cabinets. On the other hand, since the power distribution cabinet needs to be equipped with additional circuit breakers, if new power distribution modules are to be added, several spare circuit breakers need to be reserved in advance in the power distribution cabinet for use by the new power distribution modules. This makes the power system unable to be flexibly expanded.

Contents of the invention

In view of this, embodiments of the present application provide a multi-loop power supply redundant power supply system and power distribution device to at least partially solve the above problems.

According to an aspect of the embodiment of the present application, a multi-loop redundant power supply system is provided, wherein the redundant power supply system includes M power supply loops, where M is a natural number greater than 1; each of the The power supply loop includes: an input power supply, a power distribution cabinet, and at least two ring network cabinets. The output end of the input power supply is connected to the input end of the power distribution cabinet. The power distribution cabinet includes an output end. The ring network cabinet The cabinet includes at least two input terminals, and the input terminals of at least two ring network cabinets are connected to form a chain structure, and are connected to the output terminals of the power distribution cabinet to form the power supply loop; the redundant The power supply system also includes at least one group of power distribution modules. Each group of power distribution modules includes M power distribution modules that correspond one-to-one to the M power supply loops. The input end of each power distribution module is connected to the corresponding power distribution module. The output end of a ring network cabinet in the power supply loop is directly connected; the M power distribution modules in each group of power distribution modules are connected in pairs to the two input ends of the load to provide dual power to the load. powered by.

Optionally, in any embodiment of the present application, the power distribution cabinet includes at least two output terminals, and the chain structure formed by connecting the ring network cabinets in series between the at least two output terminals of the power distribution cabinet , forming a ring structure.

Optionally, in any embodiment of the present application, the input end of the ring main unit includes a control switch, and the closing of the control switch is used to control the ring main unit to be in a working state; or, in the chain structure, The disconnection of the control switches of all input terminals of any one of the ring network cabinets is used to control the disconnected ring network cabinet to be in the maintenance state; or, among the two ring network cabinets that have a connection relationship, they are connected The control switches of the two input terminals are disconnected to control the power supply loop to be in an expansion state.

Optionally, in any embodiment of the present application, the ring main unit includes three input terminals, two of the three input terminals are used to form the chain structure, and the other of the three input terminals is used for Connect to the input end of the ring main unit in a power supply loop other than the power supply loop of the ring main unit.

Optionally, in any embodiment of this application, the power distribution module includes: uninterruptible power supply equipment and an energy storage unit, and the uninterruptible power supply equipment includes a rectification unit, an inverter unit, a DC bus, and a charge and discharge unit; so The output end of the ring main unit is connected to one end of the DC bus through the rectification unit, the energy storage unit is connected to one end of the DC bus through the charge and discharge unit, and the other end of the DC bus is connected through the The inverter unit is connected to an output distribution cabinet serving as the output end of the power distribution module.

Optionally, in any embodiment of the present application, the output distribution cabinets for the two power distribution modules in each group of the power distribution modules are connected to the corresponding loads respectively. The two input terminals provide dual power supply to the load.

Optionally, in any embodiment of the present application, the DC buses included in some or all of the power distribution modules of the same group are connected in series to form a common DC bus.

Optionally, in any embodiment of the present application, a tie switch is provided between the DC buses used to form the common DC bus in series, and the tie switch is used to control the uninterruptible power supply equipment to be in an isolation state or in a non-connected state. Isolation status.

Optionally, in any embodiment of this application, the public DC bus is used to connect an external load or an external power supply through a charging and discharging unit; wherein the external load includes a charging pile; the external power supply includes a new energy power supply, and the New energy power sources include at least one of the following: solar power sources, fuel cells, wind energy power sources, ocean energy power sources, and biomass energy power sources.

Optionally, in any embodiment of the present application, some or all of the input power supplies in the M power supply loops are mutually independent power supplies.

According to another aspect of the embodiment of the present application, a power distribution device for multi-loop power supply is provided, wherein the power distribution device includes at least one group of power distribution modules, wherein each group of power distribution modules includes M power distribution modules correspond to M power supply loops one-to-one, where M is a natural number greater than 1; the input end of each power distribution module among the M power distribution modules corresponds to one of the corresponding power supply loops. The output end of the ring main unit is directly connected, and the M power distribution modules in each group of power distribution modules are connected in pairs to the two input ends of the load to provide dual power supply to the load.

Optionally, in any embodiment of this application, the power distribution module includes: uninterruptible power supply equipment and an energy storage unit, and the uninterruptible power supply equipment includes a rectification unit, an inverter unit, a DC bus, and a charge and discharge unit; so One end of the DC bus is connected to the output end of the ring main unit through the rectifier unit, the energy storage unit is connected to one end of the DC bus through the charge and discharge unit, and the other end of the DC bus is connected through the The inverter unit is connected to an output distribution cabinet serving as the output end of the power distribution module.

Optionally, in any embodiment of the present application, the output distribution cabinets for the two power distribution modules in each group of the power distribution modules are connected to the corresponding loads respectively. The two input terminals provide dual power supply to the load.

Optionally, in any embodiment of the present application, the DC buses included in some or all of the power distribution modules of the same group are connected in series to form a common DC bus.

Optionally, in any embodiment of the present application, a tie switch is provided between the DC buses used to form the common DC bus in series, and the tie switch is used to control the uninterruptible power supply equipment to be in an isolation state or in a non-connected state. Isolation status.

Optionally, in any embodiment of this application, the public DC bus is used to connect an external load or an external power supply through a charging and discharging unit; wherein the external load includes a charging pile; the external power supply includes a new energy power supply, and the New energy power sources include at least one of the following: solar power sources, fuel cells, wind energy power sources, ocean energy power sources, and biomass energy power sources.

In the embodiment of the present application, because the input end of each power distribution module is directly connected to the output end of a ring main unit in the corresponding power supply loop without being accessed by an ATS, compared with the existing technology, the number of By reducing the usage of ATS, the number of circuit breakers in the distribution cabinet can also be reduced, thereby reducing system costs. During the expansion process of new power distribution modules, only the control switch of the corresponding ring main unit needs to be disconnected without reserving a circuit breaker. Therefore, capacity expansion is less restricted, the flexibility is high, and the cost is reduced.

Description of the drawings

In order to explain the embodiments of the present application or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some of the embodiments recorded in the embodiments of this application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

Figure 1 is a schematic diagram of the redundant power supply system of the existing data center;

Figure 2 is a schematic diagram of the power distribution module of the redundant power supply system of the existing data center;

Figure 3 is a schematic diagram of a redundant power supply system with three power supply loops according to an embodiment of the present application;

Figure 4 is a schematic diagram of another redundant power supply system with three power supply loops according to an embodiment of the present application;

Figure 5 is a schematic diagram of a redundant power supply system with two power supply loops according to an embodiment of the present application;

Figure 6 is a schematic diagram of three power distribution modules providing power as a group according to an embodiment of the present application;

Figure 7 is a schematic diagram of a method for expanding the capacity of a ring-shaped power supply loop according to an embodiment of the present application;

Figure 8 is a schematic structural diagram of the input power supply of a multi-loop power supply redundant power supply system according to an embodiment of the present application;

FIG. 9 is a schematic diagram of a multi-loop power supply redundant power supply system according to an embodiment of the present application.

In the picture:

100-input power;

101a-First medium voltage mains; 101b-Second medium voltage mains

102-Generator parallel operation

103a-the first ATS; 103b-the second ATS; 103c-the third ATS;

200-power distribution cabinet;

200a-the first power distribution cabinet; 200b-the second power distribution cabinet; 200c-the third power distribution cabinet;

300-ring main unit;

300a-original ring main unit; 300b-new ring main unit;

400-power distribution module;

400a-original power distribution module; 400b-new power distribution module;

410-Uninterruptible power supply equipment; 411-rectifier unit; 412-inverter unit; 413-charge and discharge unit; 414-DC bus; 420-public DC bus; 430 low-voltage distribution cabinet; 440-energy storage unit; 450-external connection Power supply; 460-external load;

500-load;

G-generator.

Detailed ways

In order to enable those in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the description The embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the examples in the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art should fall within the scope of protection of the embodiments of this application.

The redundant power supply system of the existing data center is shown in Figure 1-2. In the power supply and distribution system, a dual-channel 10kV (dual-channel, dual-input power supply circuit, such as dual-channel mains input) medium-voltage distribution cabinet is used to provide Several power distribution modules provide power. Among them, dual mains and 10kv medium voltage generators are set up in parallel. The 10kv medium voltage generators in parallel can be composed of 8 10kV generators G in parallel. The parallel 10kv medium-voltage generator and dual-circuit mains power are input to two 10k medium-voltage distribution cabinets through ATS, forming a dual-circuit medium-voltage distribution cabinet power supply system.

The two-way medium voltage distribution cabinet can supply power to several power distribution modules. The input end of each power distribution module is equipped with ATS (Automatic Transfer Switching Equipment, automatic transfer switching equipment), and the two-way 10kV medium voltage distribution cabinet output end Connect to the ATS input.

Referring to Figure 1, 6 power distribution modules form 2 distributed redundant power systems for power supply. Each distributed redundant power system contains 3 power distribution modules, namely power distribution module A1, power distribution module Group A2 and power distribution module A3 form a distributed redundant power supply system, and power distribution module B1, power distribution module B2 and power distribution module B3 form another distributed redundant power supply system.

As shown in Figure 2, the dotted circle in Figure 2 can be a power distribution module, and the... above the dotted circle indicates that it is connected to the lowest ATS in Figure 1. In a distributed redundant power supply system, a power distribution module is generally composed of a transformer, a battery energy storage unit, a UPS and its input end distribution cabinet. Each power distribution module is cross-connected to dual power supplies through the power distribution cabinet at its UPS output end. Power is supplied from both inputs of the server. In addition, corresponding to UPS A, UPS B and UPS C in Figure 2, the three dual power supply servers are cross-connected according to AB, BC and AC respectively.

However, in the above solution, a power distribution cabinet is required to supply power to several power distribution modules. The input end of each power distribution module is equipped with an ATS to provide power supply input path redundancy, so that the power distribution cabinet usually needs to be equipped with additional circuit breakers. The device is used to perform on and off control of the connected power supply circuit and provide electrical protection such as overload. On the other hand, since the power distribution cabinet needs to be equipped with additional circuit breakers, if new power distribution modules are to be added, several spare circuit breakers need to be reserved in advance in the power distribution cabinet for use by the new power distribution modules. This makes the power system unable to be flexibly expanded.

In order to solve the above problems, according to the first aspect of the present application, the present application provides a multi-loop power supply redundant power system, including M power supply loops and at least one set of power distribution modules for powering loads. , where M is a natural number greater than 1.

Each power supply loop includes: input power supply, power distribution cabinet, and at least two ring network cabinets. The output end of the input power supply is connected to the input end of the power distribution cabinet. The power distribution cabinet includes an output end. The ring network cabinet includes at least two input ends. The input ends of the at least two ring network cabinets are connected to form a chain structure and are connected with The output end of the power distribution cabinet is connected to form a power supply loop.

Optionally, in this embodiment, some or all of the input power supplies in the power supply loop are independent power supplies. For example, in some embodiments, part or all of the input power supply may be independent mains power and/or other suitable power supplies. In addition, the input power supply may include normal use power supply and/or backup power supply. The normal use power supply may be mains power supply. Such as a power supply that can ensure continuous power supply for a long time, the backup power supply can be another mains power supply, a diesel generator power supply, etc. that can replace the power supply when the normal power supply fails.

Optionally, in this embodiment, the power distribution cabinet may be any appropriate power distribution cabinet that distributes the power of a certain circuit of the upper-level power distribution equipment to the lower-level power distribution equipment and/or loads.

Ring Main Unit is a group of electrical transmission and distribution equipment (high-voltage switchgear) installed in a metal or non-metal insulated cabinet or made into an assembled partitioned ring network power supply unit. Its core part uses load switches and Fuses have the advantages of simple structure, small size, low price, improved power supply parameters and performance, and safe power supply. The ring network cabinet in this embodiment can be any appropriate ring network cabinet that serves as a ring network power supply unit.

Through the above power supply loop, by disconnecting the control switches of the two input terminals connecting two ring network cabinets in at least two ring network cabinets that have a connection relationship, the power supply loop is in an expansion state and can be disconnected The control switches at the two input ends are connected to a new ring main unit without reserving a circuit breaker, so capacity expansion is less limited and the flexibility is high.

The redundant power supply system also includes at least one group of power distribution modules. Each group of power distribution modules includes M power distribution modules that correspond one-to-one to the M power supply loops. The input end of each power distribution module is connected to the corresponding The output end of a ring network cabinet in the power supply loop is directly connected, and the M power distribution modules in each group of power distribution modules are connected in pairs to the two input ends of the load, and are connected to the load. Dual power supply, in which dual power supply is a power supply method in which two independent power supplies supply power to the load. Failure of any power supply will not cause power interruption to the load.

In the present application, the at least one group of power distribution modules may be included in a power distribution device for multi-loop power supply, and the power distribution device may specifically be the power distribution device provided in the second aspect of the present application below.

The power distribution module obtains power from the power supply loop through the ring main unit. During specific implementation, the output end of the ring main unit is directly connected to the input end of the power distribution module, without the need to set the input end of each power distribution module. ATS reduces the number of ATS, so that the number of circuit breakers in the distribution cabinet can also be reduced, thereby reducing system costs.

The M power distribution modules included in a set of power distribution modules correspond to M power supply loops one-to-one. The input end of each power distribution module is connected to the output end of a ring network cabinet in the corresponding power supply loop. As a result, a group of power distribution modules can be powered by M independent power supplies, which improves the stability of the power supply process.

The following is an exemplary description of the multi-loop power supply redundant power system provided in this embodiment through a specific implementation manner. It should be noted that in this embodiment, only three power supply loops are used as an example to illustrate the redundant power supply system with multi-loop power supply, but this is not a limitation of the present application.

As shown in Figure 3, the redundant power supply system includes three power supply loops. Each power supply loop includes: input power supply 100, power distribution cabinet 200 and three ring network cabinets 300. The output end of the input power supply 100 is connected to the power distribution cabinet 200. The input end of the power distribution cabinet 200 includes two output ends, and the ring network cabinet 300 includes two input ends. The input ends of the two ring network cabinets 300 are connected to form a chain structure, and are connected with the output end of the power distribution cabinet 200. connection to form a power supply loop.

In some embodiments, the power distribution cabinet 200 in each power supply loop may include three output terminals in preparation for connecting other devices. The number of ring network cabinets 300 in each power supply loop may also be 2, 4, or 5. and other quantities.

As shown in Figure 3, according to the structural diagram of this embodiment, the power distribution cabinet 200 may include two output terminals. The two output terminals of the power distribution cabinet 200 are connected in series with the ring main unit 300 to form a chain structure. In this case, each The power distribution cabinet 200 and the three ring network cabinets 300 form a ring structure. In the ring structure, the two output ends of the power distribution cabinet can provide dual power supply to the ring main unit. When one power supply line fails, the other power supply line can still supply power normally.

When capacity expansion is required, the control switches of the two input terminals connecting the two ring network cabinets in at least two ring network cabinets with a connection relationship can be disconnected, and the power supply loop will be in the capacity expansion state, and can be disconnected The control switches at the two input ends are connected to a new ring main unit without reserving a circuit breaker, so capacity expansion is less limited and the flexibility is high. Please refer to subsequent embodiments for specific expansion plans.

As an optional solution, only one of the two output ends of the power distribution cabinet 200 is connected to the input end of the ring main unit 300, as shown in Figure 4. At this time, each power distribution cabinet 200 forms a connection with three ring main unit cabinets 300. Open chain structure. In the open-loop chain structure, the power distribution cabinet can provide single-channel power supply to the ring main unit, reducing the complexity of the circuit.

When capacity expansion is required, ring network cabinets can be added directly at the end of the chain structure without the need to reserve circuit breakers, so capacity expansion is less restricted and the flexibility is high.

In some embodiments, the ring main unit 300 may also include three input terminals. As shown in FIG. 5 , two of the three input terminals are used to form a chain structure, and the other one is used to communicate with the ring main unit 300 . The input terminals of the ring network cabinet 300 in other power supply loops other than the power supply loop are connected, that is, the input terminals in the middle of the two ring network cabinets in Figure 5 are connected through the wires represented by the dotted lines. When the input power supply of the loop where a ring network cabinet is located fails, the input end connected to the input end of the ring network cabinet 300 in other power supply loops other than the power supply loop of the ring network cabinet can be used to obtain power from other power supply loops. , increase the redundancy of the power system.

In this embodiment, the redundant power supply system also includes three groups of power distribution modules. Each group of power distribution modules includes three power distribution modules 400 corresponding to three power supply loops, as shown in Figure 3. The three power distribution modules 400 in each dotted box form a group of power distribution modules. The input end of each power distribution module 400 is directly connected to the output end of a ring network cabinet 300 in the corresponding power supply loop, and There is no need to be accessed by an ATS. Compared with existing technologies, the usage of ATS is reduced and the equipment cost is reduced. Three power distribution modules 400 in each group of power distribution modules are combined in pairs to provide dual power supply to the load, which increases the redundancy of the system.

In this embodiment, the power supply of one power distribution module 400 in each group of power distribution modules is redundant.

For example, referring to FIG. 6 , three power distribution modules 400 form a group of power distribution modules 400 with a capacity of 2+1. In one embodiment, the total capacity of each power distribution module 400 is 1500kVA, and the power supply capacity required by each load 500 is 1000kVA. When the three power distribution modules 400 are all operating normally, two of the single power distribution module 400 Each output terminal outputs 500kVA to its corresponding load 500, with a total output of 1000kVA, and a load rate of 66.7%. At this time, the power supply capacity of both input terminals of a single load 500 is 500kVA, with a total input of 1000kVA; when there is a power distribution module When 400 fails, the two loads 500 output by the power distribution module 400 can no longer obtain power supply from the power distribution module 400. At this time, the power supply capacity output by the other two power distribution modules 400 to the two loads 500 is from The original 500kVA is increased to 1000kVA, and the power supply capacity of the two input terminals of the remaining load 500 is still 500kVA. That is, each load 500 can still obtain a power supply capacity of 1000kVA at this time, and the two normally operating power distribution modules 400 They all maintain a full load output of 1500kVA and a load rate of 100%. Therefore, the power input failure of the loop to which any power distribution module 400 belongs will not affect the normal operation of the load. That is, the power supply of one power distribution module 400 is redundant. of. In some embodiments, the power supply of more power distribution modules 400 in each group of power distribution modules may be redundant.

Referring to Figure 6, the power distribution module 400 includes: an uninterruptible power supply device 410, an energy storage unit 440, and a low-voltage distribution cabinet 430 as an output distribution cabinet. Optionally, the output distribution cabinet may be a low-voltage distribution cabinet 430 or other appropriate distribution cabinet, which is not limited in the embodiment of the present application.

The output end of the ring main unit 300 is connected through the input end of the rectifier unit 411. The energy storage unit 440 is connected to one end of the DC bus 414 through the charge and discharge unit 413. The other end of the DC bus 414 is connected to the low-voltage distribution cabinet through the inverter unit 412. 430 to provide redundant power supply to the load through the low-voltage distribution cabinet 430. Among them, the DC buses 414 included in all the power distribution modules 400 of the same group are connected in series to form a common DC bus 420. In other embodiments, the DC buses included in the partial power distribution modules of the same group can also be connected in series to form a common DC bus.

The common DC bus 420 allows multiple sets of uninterruptible power supply equipment 410 to cooperate with each other. When a certain uninterruptible power supply equipment fails, the circuit where the uninterruptible power supply equipment is located can still obtain power from the common DC bus 420, that is, different uninterruptible power supply equipment They are backed up through the common DC bus 420 to improve redundancy.

Specifically, in this embodiment, the uninterruptible power supply device 410 includes a rectifier unit 411, an inverter unit 412, a DC bus 414, and a charge and discharge unit 413. Among them, the rectifier unit 411 uses a rectifier to convert the input AC power into DC power and outputs it to the DC bus 414; the DC bus 414 serves as a DC power distribution conductor and is connected to the rectifier unit 411, the inverter unit 412 and the charge and discharge unit 413; the inverter unit 412 The input end is connected to the DC bus 414, and an inverter is used to convert DC power into AC power for output; the charging and discharging unit 413 is characterized by using a DC/DC converter to achieve DC/DC bidirectional current conversion according to the working status of the uninterruptible power supply. Including the charging and discharging status of the energy storage unit 440, and other units supplying power to or obtaining power from the DC bus 414. The uninterruptible power supply equipment 410 can be used to convert 10kV medium-voltage alternating current into 380V low-voltage alternating current. The energy storage unit 440 is an energy storage device that can store direct current. Specifically, the energy storage unit can be a chemical energy storage device, such as a lead-acid battery. , or it can be a physical energy storage device, such as a flywheel energy storage device; the low-voltage distribution cabinet 430 can be used to distribute 380V low-voltage AC power to the load 500 to achieve the output of each distribution module 400 in each group of distribution modules. And the two-by-two combinations are connected to the two input terminals of the load to provide dual power supply to the load.

In this embodiment, a tie switch is provided between the DC buses 414 connected in series to form a common DC bus 420. The tie switch is used to control the uninterruptible power supply equipment to be in an isolation state or a non-isolation state. When in the isolation state, the uninterruptible power supply can be inspected or otherwise operated; when in the non-isolation state, it can be connected in series with other uninterruptible power supply equipment to form a common DC bus 420, so that the uninterruptible power supply equipment can obtain from the public DC bus. electrical energy.

In this embodiment, as shown in Figure 6, the public DC bus 420 can also connect an external load 460 and an external power supply 450 through the charging and discharging unit 413, where the external load 460 is a charging pile and the external power supply 450 is a solar power supply; as an additional As an optional solution, the external power supply can also be other types of new energy power supplies, or a combination of various new energy sources. Furthermore, the external power supply can also be a combination of traditional power supplies and new energy power supplies. The external load is a charging pile, which facilitates the use of new energy vehicles and helps protect the environment; the external power supply uses new energy combined with energy storage units, which can cooperate with the mains for peak and frequency regulation and even transmit power to the power grid company to make profits and reduce costs. In addition, new energy can be used to reduce costs. Energy power can also save natural resources such as coal, oil and gas, and reduce carbon emissions, thereby achieving the purpose of saving resources and protecting the environment.

The following describes the use process of the power supply loop.

The input end of the ring main unit 300 includes a control switch, and the output end of the power distribution cabinet 200 also includes a control switch.

The closing of the control switch of the ring main unit is used to control the ring main unit to be in a working state. When it is in a working state, the ring main unit can provide power to the power distribution module. For example, disconnecting the control switches at both input ends of any ring main unit will take it out of working condition, and then closing the two switches will restore the ring main unit to working condition.

The disconnection of the control switches of all input terminals of any ring network cabinet in the power supply loop is used to control the disconnected ring network cabinet to be in the maintenance state. At this time, the power supply of the ring network cabinet is stopped, which is convenient for the ring network The cabinet and its output circuits should be inspected.

For one aspect of the embodiment of the present application, in the two ring network cabinets with a connection relationship, the control switches of the two connected input terminals are disconnected to control the power supply loop to be in an expansion state.

As shown in Figure 7, this power supply loop originally had three original ring network cabinets 300a. These three ring network cabinets formed a chain structure. Now a new ring network cabinet 300b is added to expand the capacity. The control switches of the two input terminals connected between the two original ring network cabinets 300a that have a connection relationship can be disconnected first, and a new ring network cabinet 300b can be added at the disconnected position.

Specifically, the chain structure formed by connecting three original ring network cabinets 300a in series between the two output ends of the power distribution cabinet 200 forms a ring structure. Figure 7 shows the two original ring network cabinets with a connection relationship in the ring power supply loop. The control switches of the two input terminals connected between 300a are disconnected, so that the power supply loop is in an expansion state.

As shown in Figure 7, add a new ring network cabinet 300b and its corresponding new power distribution module 400b at the position of disconnecting the loop. Connect the two control switches of the new ring network cabinet 300b to the two original ring network cabinets respectively. The control switches of the two disconnected input terminals of the network cabinet 300a are connected, and all control switches are closed to complete the capacity expansion.

As an optional method, for the original ring main unit 300a connected to the power distribution cabinet 200, the control switches of the input end of the original ring main unit 300a connected to the power distribution cabinet 200 and the output end of the power distribution cabinet 200 can be disconnected. , making the power supply loop in an expansion state. Add a new ring network cabinet 300b and its corresponding new power distribution module 400b at the position of disconnecting the loop, connect one of the two control switches of the new ring network cabinet 300b to the disconnected power distribution module Connect the control switch at the output end of cabinet 200, and the other one is connected to the control switch at the output end of the disconnected original ring main unit 300a. Close all control switches to complete the capacity expansion.

Since the ring main unit can be powered by at least two input terminals, when the control switch of one of the input terminals is turned off, the original ring main unit 300a can still be provided with power by the power distribution cabinet 200, so that during the expansion process, the original ring main unit and its The connected power distribution module works normally.

In the process of adding a new power distribution module, it is only necessary to disconnect the corresponding control switch without reserving a circuit breaker, and because it can be expanded between the original ring main unit and between the original ring main unit and the distribution cabinet. Expansion is carried out, so the expansion is less restricted and the flexibility is high.

In some embodiments, only one of the two output terminals of the power distribution cabinet 200 may be connected to the input terminal of the original ring main unit to form a chain structure, wherein the original ring main unit at the end of the chain structure has two input terminals, One of the two input terminals is in an unconnected state, so that the control switch of the unconnected input terminal is in a disconnected state. Add a new ring main unit and its corresponding new configuration at the position of the disconnected control switch. Electric module, connect this disconnected control switch to the input end of the new power distribution cabinet, close all control switches to complete the capacity expansion. In this case, when adding a new power distribution module, it is only necessary to disconnect the corresponding control switch without reserving a circuit breaker, which improves the flexibility of capacity expansion.

For other power supply loops, repeat the above process for capacity expansion, and combine the new power distribution module of each power supply loop with the other two new power distribution modules to form two loads for dual power supply.

The power supply of the power supply loop is explained below.

The power supply loop can be the mains power of the grid, or it can be a self-set generator or other suitable power source such as solar power source or fuel cell. The power supplies of each power supply loop in a multi-loop redundant power supply system can be the same power supply or different power supplies, and some or all of the input power supplies should be independent power supplies.

For example, taking power supply for three power supply loops as an example, as shown in Figure 8, this embodiment provides an input power supply structure of a multi-loop power supply redundant power supply system, which may include a first medium voltage power supply. Electricity 101a, second medium voltage mains 101b, generator parallel 102, first ATS 103a, second ATS 103b, third ATS 103c. The output terminals of the first ATS 103a, the second ATS 103b and the third ATS 103c are respectively connected to the input terminals of the first power distribution cabinet 200a, the second power distribution cabinet 200b and the third power distribution cabinet 200c. The three power distribution cabinets are respectively Powers three supply loops. Among them, the power consumption capacity of all loads in the three power distribution cabinets is N, the output power of the two mains power is N respectively, and the output power of the parallel generator 102 is also N; the first medium-voltage mains power 101a, the second medium-voltage mains power 101b are all 10kV mains power, and the parallel generator 102 is output by eight 10kV generators G in parallel. In some embodiments, the voltage of the first medium-voltage mains 101a, the second medium-voltage mains 101b and the generator in the parallel generator 102 can be selected between 10 and 35kV according to the power supply requirements of the circuit, for example, to meet For power supply requirements of 10kV, 20kV and 35kV, the number of parallel generators 102 can be configured according to the load capacity.

As shown in Figure 8, in this embodiment, an output terminal of the first medium voltage mains 101a and the parallel generator 102 is connected to the input terminal of the first ATS 103a, and the output terminal of the first ATS 103a is connected to the first power distribution cabinet 200a. The input end of the second medium voltage mains 101b and the other output end of the parallel generator 102 are connected to the input end of the second ATS 103b, and the output end of the second ATS 103b is connected to the input end of the second power distribution cabinet 200b; The first power distribution cabinet 200a and the second power distribution cabinet 200b include three output terminals. Two of the three output terminals are used to form a power supply loop with the ring main unit, and the other output terminal is connected to the third ATS 103c. The input end of the third ATS 103c is connected to the input end of the third power distribution cabinet 200c. The two output ends of the third power distribution cabinet 200c are used to form a power supply loop with the ring network cabinet. In this way, when the input power of any power supply loop fails, the input power of other power supply loops can still operate normally, and their output power can meet the power consumption of all loads; in some embodiments, the three power supply loops can Some or all of the input power sources in the circuit are independent power sources, and each medium-voltage distribution cabinet 200 can be powered by a mains power supply with an output power of N and/or a suitable generator set.

According to the above embodiment, as shown in Figure 9, through the hybrid design of the ring main unit 300 and the ATS, a power system design with a load capacity of 2+1 can be realized with 3 ATS. However, the existing technology often requires 6 power distribution modes. The input end of the group needs to be set up with 6 ATS. Therefore, this application uses fewer ATSs compared to the prior art, and due to the reduced number of ATSs, the number of circuit breakers in the distribution cabinet 200 can also be reduced, thereby reducing system costs.

Combined with the above embodiment, in Figure 9, if any one of the first medium-voltage mains 101a and the second medium-voltage mains 101b fails, the other mains can supply power to this loop through the third ATS 103c. Furthermore, if both the first medium-voltage mains 101a and the second medium-voltage mains 101b fail, the parallel generator 102 can still provide power instead of the two mains. In a separate power supply loop, when one of the two lines output from the output end of the distribution cabinet to the ring network cabinet fails, the line can be cut off. At this time, the line output from the other output end of the distribution cabinet can also bear the entire load. Loop, does not affect the power supply of the power distribution module. If a ring main unit 300 fails and its corresponding output power distribution module has no input, the UPS of the power distribution module can obtain power from other UPS through the DC bus to continue supplying power to the load. To sum up, in the face of these four possible faults, the embodiment of the present application only loses a certain degree of redundancy due to the fault, and can still provide power without interruption. It can be seen that the power supply system of the present application has many advantages. High reliability.

Embodiments of the present application also provide a power distribution device for multi-loop power supply. The power distribution device includes at least one group of power distribution modules, wherein each group of power distribution modules includes M power distribution modules and M The power supply loops correspond one to one, where M is a natural number greater than 1. The input end of each power distribution module in the M power distribution modules is directly connected to the output end of a ring network cabinet in the corresponding power supply loop. The M power distribution modules in each group of power distribution modules have two The two combinations are connected to the two input terminals of the load and provide dual power supply to the load. When any one of the power distribution modules fails, the power supply to the load is not interrupted. For specific implementation details, reference may be made to the embodiments in FIG. 3 and FIG. 4 .

The power distribution module includes uninterruptible power supply equipment and energy storage units. Uninterruptible power supply equipment includes rectifier units, inverter units, DC bus bars, and charge and discharge units. One end of the DC bus is connected to the output end of the ring main unit through a rectifier unit, the energy storage unit is connected to one end of the DC bus through a charge and discharge unit, and the other end of the DC bus is connected through the inverter unit as the output of the power distribution module The output distribution cabinet at the end. In some embodiments, the output distribution cabinet may be a low-voltage distribution cabinet or other suitable distribution cabinet. For specific implementation, please refer to the embodiment of FIG. 6 .

In some embodiments, the output distribution cabinets for the two power distribution modules in each group of the power distribution modules are respectively connected to the two input terminals of the corresponding loads. , dual power supply is provided to the load. For specific implementation, reference can be made to the embodiment of FIG. 6 .

In some embodiments, the DC buses included in some or all of the power distribution modules of the same group of power distribution modules are connected in series to form a common DC bus. Optionally, the DC buses used in series to form the common DC bus are A contact switch is provided between the DC bus bars, and the contact switch is used to control the uninterruptible power supply equipment to be in an isolation state or a non-isolation state. For specific implementation details, reference may be made to the embodiment of FIG. 6 .

The public DC bus can be used to connect an external load or an external power supply through a charge and discharge unit. The external load includes a charging pile, and the external power supply includes a new energy power supply. Optionally, the new energy power supply includes at least one of the following: solar power, fuel Batteries, wind power, ocean power, biomass power. For specific implementation details, reference may be made to the embodiment of FIG. 6 .

It should be pointed out that according to the needs of implementation, each component/step described in the embodiments of this application can be split into more components/steps, or two or more components/steps or partial operations of components/steps can be combined into New components/steps to achieve the purpose of the embodiments of this application.

Those of ordinary skill in the art will appreciate that the units and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of the embodiments of the present application.

The above embodiments are only used to illustrate the embodiments of the present application, but are not intended to limit the embodiments of the present application. Those of ordinary skill in the relevant technical fields can also make various modifications without departing from the spirit and scope of the embodiments of the present application. Changes and modifications, therefore all equivalent technical solutions also fall within the scope of the embodiments of this application, and the patent protection scope of the embodiments of this application should be limited by the claims.

Claims (12)

1. A multi-loop powered redundant power supply system, wherein the redundant power supply system comprises M power supply loops, wherein M is a natural number greater than 1;

each of the power supply loops includes: the power supply system comprises an input power supply, a power distribution cabinet and at least two ring main units, wherein the output end of the input power supply is connected to the input end of the power distribution cabinet, the power distribution cabinet comprises an output end, the ring main units comprise at least two input ends, and the input ends of the at least two ring main units are connected to form a chain structure and are connected with the output end of the power distribution cabinet to form the power supply loop;

the redundant power supply system further comprises at least one group of power distribution modules, each group of power distribution modules comprises M power distribution modules which are in one-to-one correspondence with the M power supply loops, and the input end of each power distribution module is directly connected with the output end of one ring main unit in the corresponding power supply loop; the M power distribution modules in each group of power distribution modules are connected to two input ends of a load in a pairwise combination mode, and double power supply is conducted on the load;

wherein, the power distribution module includes: the power supply system comprises uninterruptible power supply equipment and an energy storage unit, wherein the uninterruptible power supply equipment comprises a rectifying unit, an inversion unit, a direct current bus and a charging and discharging unit;

the output end of the ring main unit is connected with one end of the direct current bus through the rectifying unit, the energy storage unit is connected with one end of the direct current bus through the charging and discharging unit, the other end of the direct current bus is connected with the output power distribution cabinet serving as the output end of the power distribution module through the inversion unit, and

and the direct current buses respectively included in part or all of the power distribution modules in the same group are connected in series to form a common direct current bus.

2. The system of claim 1, wherein the power distribution cabinet comprises at least two output ends, and the chain structure formed by the ring main unit is connected in series between the at least two output ends of the power distribution cabinet to form a ring structure.

3. The system of claim 2, wherein,

the input end of the ring main unit comprises a control switch, and the closing of the control switch is used for controlling the ring main unit to be in a working state; or,

the control switches of all input ends of any ring main unit in the chain structure are disconnected and used for controlling the disconnected ring main unit to be in an overhaul state; or,

in the two ring main units with the connection relationship, the control switches of the two connected input ends are disconnected and used for controlling the power supply loop to be in a capacity expansion state.

4. The system of claim 1, wherein the ring main unit comprises three inputs, two of the three inputs being used to form the chain structure, another of the three inputs being used to connect with inputs of the ring main unit in other power loops than the power loop of the ring main unit.

5. The system of claim 1, wherein the output power distribution cabinets of two power distribution modules for two power distribution modules in each group are respectively connected to two input ends of the corresponding load to perform dual power supply on the load.

6. The system of claim 1, wherein a tie switch is provided between the dc buses for serially forming the common dc bus, the tie switch being for controlling the uninterruptible power supply to be in an isolated state or a non-isolated state.

7. The system of claim 1, wherein the common dc bus is used for connecting an external load or an external power supply through a charge-discharge unit;

wherein the external load comprises a charging pile;

the external power supply comprises a new energy power supply, and the new energy power supply comprises at least one of the following components: solar power supply, fuel cell, wind power supply, ocean energy power supply and biomass energy power supply.

8. The system of claim 1, wherein some or all of the input power sources in the M power supply loops are mutually independent power sources.

9. A power distribution device applied to multi-loop power supply, wherein the power distribution device comprises at least one group of power distribution modules, each group of power distribution modules comprises M power distribution modules which are in one-to-one correspondence with M power supply loops, and M is a natural number larger than 1;

the input end of each of the M power distribution modules is directly connected with the output end of one ring main unit in a corresponding power supply loop, wherein the M power distribution modules in each group of power distribution modules are connected to the two input ends of a load in a pairwise combination manner, and double power supply is carried out on the load;

wherein, the power distribution module includes: the power supply system comprises uninterruptible power supply equipment and an energy storage unit, wherein the uninterruptible power supply equipment comprises a rectifying unit, an inversion unit, a direct current bus and a charging and discharging unit;

the output end of the ring main unit is connected with one end of the direct current bus through the rectifying unit, the energy storage unit is connected with one end of the direct current bus through the charging and discharging unit, the other end of the direct current bus is connected with the output power distribution cabinet serving as the output end of the power distribution module through the inversion unit, and

and the direct current buses respectively included in part or all of the power distribution modules in the same group are connected in series to form a common direct current bus.

10. The power distribution device of claim 9, wherein the output power distribution cabinets of two power distribution modules for two power distribution modules in each group are respectively connected to two input ends of the corresponding load to perform dual-power supply on the load.

11. The power distribution apparatus of claim 9, wherein a tie switch is provided between the dc buses for serially forming the common dc bus, the tie switch being for controlling the uninterruptible power supply device to be in an isolated state or a non-isolated state.

12. The power distribution device of claim 9, wherein the common dc bus is used to connect an external load or an external power source through a charge-discharge unit;

wherein the external load comprises a charging pile;

the external power supply comprises a new energy power supply, and the new energy power supply comprises at least one of the following components: solar power supply, fuel cell, wind power supply, ocean energy power supply and biomass energy power supply.