CN115398769B - Redundant power supply system with multi-loop power supply and power distribution device - Google Patents

Abstract

The embodiment of the application provides a redundant power supply system with multi-loop power supply and a power distribution device. The redundant power supply system for multi-loop power supply comprises M power supply loops, wherein M is a natural number greater than 1. Wherein each power supply loop comprises: input power, switch board, two at least looped netowrk cabinets, input power's output is connected to the input of switch board, and the looped netowrk cabinet includes two at least inputs, connects between the input of two at least looped netowrks and forms chain structure to be connected with the output of switch board, constitute power supply loop. The redundant power supply system also comprises at least one group of power distribution modules, wherein 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 connected with the output end of one ring main unit in the corresponding power supply loop; each power distribution module is used for redundant power supply to a load.

Description

Redundant power supply system with multi-loop power supply and power distribution device

Technical Field

The application relates to the field of power supply, in particular to a redundant power supply system and a power distribution device for multi-loop power supply.

Background

At present, for a power supply scheme in a data center, in consideration of the safety of power supply, a power supply system of the data center often adopts a redundant design, namely, more than one set of functional channels, working elements or components for completing the same function are added at a place where the power supply system plays a key role in completing tasks, so that when a fault occurs in the part, the system or equipment can still work normally, and the fault probability of the system or equipment is reduced. For example, a power supply system is generally provided with a plurality of UPS (Uninterruptable Power System, uninterruptible power supply) groups, and the UPS groups provide a single-path power supply or a multi-path power supply for loads of a plurality of machine rooms, so that multi-path power supply is realized in the same power supply system. In the redundant power supply system of the existing data center, a power distribution cabinet is generally used for supplying power to a plurality of power distribution modules, and an ATS (Automatic Transfer Switching Equipment, automatic transfer switch) is often arranged at the input end of each power distribution module to provide redundancy of power supply input paths, so that the power distribution cabinet is usually required to be provided with an additional circuit breaker. On the other hand, because the power distribution cabinet needs to be provided with additional circuit breakers, if a power distribution module needs to be newly added, a plurality of standby circuit breakers need to be reserved in the power distribution cabinet in advance for the newly added power distribution module, so that the capacity of the power supply system cannot be flexibly expanded.

Disclosure of Invention

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

According to an aspect of an embodiment of the present application, there is provided a redundant power supply system for multi-loop power supply, wherein the redundant power supply system includes M power supply loops, where 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; and M power distribution modules in each group of power distribution modules are connected to two input ends of a load in a pairwise combination way, and double power supply is performed on the load.

Optionally, in any embodiment of the present application, the power distribution cabinet includes at least two output ends, and the chain structure formed by the ring main unit is connected between the at least two output ends of the power distribution cabinet in series, so as to form a ring structure.

Optionally, in any embodiment of the present application, an input end of the ring main unit includes a control switch, and closing of the control switch is used to control 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.

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

Optionally, in any embodiment of the present application, 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, and 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.

Optionally, in any embodiment of the present application, the output power distribution cabinets of two power distribution modules used for two power distribution modules combined in each group are respectively connected to two input ends of the corresponding load, so as to perform dual-power supply on the load.

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

Optionally, in any embodiment of the present application, a tie switch is disposed between the dc buses used for serially forming the common dc bus, where the tie switch is used to control the uninterruptible power supply device to be in an isolated state or a non-isolated state.

Optionally, in any embodiment of the present application, the common dc bus is used for connecting an external load or an external power supply through a charging and discharging 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.

Optionally, in any embodiment of the present application, part or all of the input power sources in the M power supply loops are independent power sources.

According to another aspect of the embodiment of the present application, there is provided a power distribution device applied to multi-loop power supply, where the power distribution device includes at least one group of power distribution modules, where each group of power distribution modules includes M power distribution modules in one-to-one correspondence with M power supply loops, where M is a natural number greater than 1; the input end of each distribution module in the M distribution modules is directly connected with the output end of one ring main unit in a corresponding power supply loop, wherein the M distribution modules in each group of distribution modules are connected to the two input ends of a load in a pairwise combined mode, and double power supply is carried out on the load.

Optionally, in any embodiment of the present application, 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; one end of the direct current bus is connected with the output end of the ring main unit through the rectifying unit, the energy storage unit is connected with one end of the direct current bus through the charging and discharging unit, and 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.

Optionally, in any embodiment of the present application, the output power distribution cabinets of two power distribution modules used for two power distribution modules combined in each group are respectively connected to two input ends of the corresponding load, so as to perform dual-power supply on the load.

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

Optionally, in any embodiment of the present application, a tie switch is disposed between the dc buses used for serially forming the common dc bus, where the tie switch is used to control the uninterruptible power supply device to be in an isolated state or a non-isolated state.

Optionally, in any embodiment of the present application, the common dc bus is used for connecting an external load or an external power supply through a charging and discharging 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.

In the embodiment of the application, because 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 without being accessed by an ATS, compared with the prior art, the use amount of the ATS is reduced, so that the number of circuit breakers of the power distribution cabinet can be reduced, and the system cost is reduced. In the capacity expansion process of the newly-added power distribution module, only the control switch of the corresponding ring main unit is required to be disconnected without reserving a breaker, so that the capacity expansion limit is less, the flexibility is high, and the cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present application, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.

FIG. 1 is a schematic diagram of a redundant power supply system of a conventional data center;

FIG. 2 is a schematic diagram of a power distribution module of a redundant power supply system of a conventional data center;

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

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

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

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

FIG. 7 is a schematic diagram of a method for expanding a loop of power supply in a loop configuration according to an embodiment of the present application;

FIG. 8 is a schematic diagram of the input power of a multi-loop powered redundant power supply system in accordance with an embodiment of the present application;

fig. 9 is a schematic diagram of a multi-loop powered redundant power supply system in accordance with an embodiment of the present application.

In the figure:

100-input power supply;

101 a-a first medium voltage mains; 101 b-second medium voltage mains supply

102-generator parallel operation

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

200-a power distribution cabinet;

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

300-ring main unit;

300 a-original ring main unit; 300 b-newly-added ring main unit;

400-power distribution module;

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

410-uninterruptible power supply equipment; 411-rectifying unit; 412-an inverter unit; 413-a charge-discharge unit; 414-direct current bus; 420-a common direct current bus; 430 low-voltage power distribution cabinet; 440-an energy storage unit; 450-an external power supply; 460-external load;

500-load;

g-generator.

Detailed Description

In order to better understand the technical solutions in the embodiments of the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the present application, shall fall within the scope of protection of the embodiments of the present application.

The redundant power supply system of the existing data center is shown in fig. 1-2, in a power supply and distribution system, a two-way 10kV (two-way, namely, double-input power supply loop, such as two-way mains supply input) medium voltage power distribution cabinet is used for supplying power to a plurality of power distribution modules, wherein two-way mains supply and 10kV medium voltage generator parallel operation are arranged, and the 10kV medium voltage generator parallel operation can be formed by 8 10kV generator G parallel operation. And the parallel operation of the 10kv medium-voltage generator and the double-circuit commercial power are respectively input into two 10k medium-voltage power distribution cabinets through the ATS to form a double-circuit medium-voltage power distribution cabinet power supply system.

The double-circuit medium voltage distribution cabinet can supply power for a plurality of distribution modules, each distribution module input is provided with an ATS (Automatic Transfer Switching Equipment, automatic transfer switch) and two paths of 10kV medium voltage distribution cabinet output ends are connected into the ATS input ends.

Referring to fig. 1,6 power distribution modules form 2 distributed redundant power systems for supplying power, and each distributed redundant power system includes 3 power distribution modules, namely, a power distribution module A1, a power distribution module A2 and a power distribution module A3 form one distributed redundant power system, and a power distribution module B1, a power distribution module B2 and a power distribution module B3 form another distributed redundant power system.

As shown in fig. 2, the dashed coil in fig. 2 may be a power distribution module, with … over the dashed coil identifying the connection to the lowest ATS in fig. 1. In a distributed redundant power supply system, a transformer, a battery energy storage unit, a UPS and power distribution cabinets at input ends thereof generally form power distribution modules, and each power distribution module is respectively and cross-connected to two input ends of a dual-power server for power supply through the power distribution cabinet at the output end of the UPS. In addition, corresponding to UPS a, UPS B and UPS C in fig. 2, three dual power 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 a plurality of power distribution modules, and an ATS is provided at an input end of each power distribution module to provide redundancy of a power supply input path, so that the power distribution cabinet is generally required to provide an additional circuit breaker for performing control of turning on and off a connected power supply loop and providing electrical protection such as overload. On the other hand, because the power distribution cabinet needs to be provided with additional circuit breakers, if a power distribution module needs to be newly added, a plurality of standby circuit breakers need to be reserved in the power distribution cabinet in advance for the newly added power distribution module, so that the capacity of the power supply system cannot be flexibly expanded.

To solve the above problems, according to a first aspect of the present application, there is provided a redundant power supply system for multi-loop power supply, comprising M power supply loops and at least one set of power distribution modules for supplying power to a load, wherein M is a natural number greater than 1.

Each power supply loop includes: input power supply, switch board, two at least looped netowrk cabinets. The output of input power is connected to the input of switch board, and the switch board includes the output, and the looped netowrk cabinet includes two at least inputs, connects between the input of two at least looped netowrks and forms chain structure to be connected with the output of switch board, constitute power supply loop.

Optionally, in this embodiment, part or all of the input power sources in the power supply loop are independent power sources. For example, in some embodiments, some or all of the input power sources may employ independent utility power and/or other suitable power sources, and in addition, the input power sources include a normal power source and/or a standby power source, where the normal power source may be a power source capable of ensuring continuous power supply for a long time, such as the utility power source, and the standby power source may be another power source, such as a diesel generator power source, capable of replacing the normal power source when the normal power source fails.

Alternatively, in this embodiment, the power distribution cabinet may be any suitable power distribution cabinet that distributes power from a circuit of a higher-level power distribution device to a lower-level power distribution device and/or a load.

The Ring Main Unit (Ring Main Unit) is a group of electric equipment (high-voltage switch equipment) which is arranged in a metal or nonmetal insulating cabinet body or is made into an assembled interval Ring Main power supply Unit, and the core part of the Ring Main Unit adopts a load switch and a fuse, so that the Ring Main Unit has the advantages of simple structure, small volume, low price, capability of improving power supply parameters and performance, power supply safety and the like. The ring main unit in this embodiment may be any suitable ring main unit as a ring main power supply unit.

Through above-mentioned power supply loop, through the control switch disconnection of two input that two looped netowrk cabinets that have relation of connection in at least two looped netowrk cabinets are connected, power supply loop just is in the dilatation state, can connect the newly-increased looped netowrk cabinet between the control switch of two input of disconnection, and need not to reserve the circuit breaker, so the dilatation restriction is less, and the flexibility is high.

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 corresponding to the M power supply loops one to one, 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 the two input ends of the load in a two-by-two combined mode, double-power supply is carried out on the load, the double-power supply is a power supply mode of supplying power to the load by two mutually independent power supplies, and any power supply fault does not cause power interruption of the load.

In the present application, the at least one set of power distribution modules may be included in a power distribution apparatus for multi-loop power supply, which may be specifically a power distribution apparatus provided in the second aspect of the present application hereinafter.

When the power distribution module obtains electric energy from the power supply loop through the ring main unit and is implemented, the output end of the ring main unit is directly connected to the input end of the power distribution module, and ATS is not required to be arranged at the input end of each power distribution module, so that the number of ATS is reduced, the number of circuit breakers of the power distribution cabinet can be reduced, and the system cost is reduced.

The M power distribution modules included in the group of power distribution modules are in one-to-one correspondence with the M power supply loops, and the input end of each power distribution module is connected with the output end of one ring main unit in the corresponding power supply loop, so that the M independent power supplies can supply power to the group of power distribution modules, and the stability of the power supply process is improved.

The redundant power supply system for multi-loop power supply provided in this embodiment is described below in an exemplary manner. In this embodiment, the redundant power supply system for supplying power to the multiple loops is described by taking only 3 power supply loops as an example, but the present application is not limited thereto.

As shown in fig. 3, the redundant power supply system includes 3 power supply loops, each including: input power supply 100, switch board 200 and three looped netowrk cabinet 300, the output of input power supply 100 is connected to the input of switch board 200, and switch board 200 includes two outputs, and looped netowrk cabinet 300 includes two inputs, connects between the input of two looped netowrk cabinets 300 and forms chain structure to be connected with the output of switch board 200, constitute power supply loop.

In some embodiments, power distribution cabinet 200 may include 3 outputs for connection to other devices in each power supply loop, and the number of ring main units 300 in each power supply loop may be 2, 4, 5, etc.

As shown in fig. 3, according to the structure diagram of the present embodiment, the power distribution cabinet 200 may include two output ends, and the two output ends of the power distribution cabinet 200 are connected in series to form a chain structure with the ring main unit 300, where each power distribution cabinet 200 and the three ring main units 300 form a ring structure. Two output ends of the power distribution cabinet in the annular structure can supply power to the ring main unit in a double-circuit mode, and when one power supply circuit fails, the other power supply circuit can still supply power normally.

When the expansion is needed, the control switches of the two input ends connected with the two ring main units with the connection relation in the at least two ring main units can be disconnected, the power supply loop is in an expansion state, and the ring main units can be newly added between the disconnected control switches of the two input ends without reserving a circuit breaker, so that the expansion is limited less, and the flexibility is high. Specific expansion schemes are detailed in the following examples.

Alternatively, 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 fig. 4, where each power distribution cabinet 200 and the three ring main units 300 form an open-loop chain structure. In the open-loop chain structure, the power distribution cabinet can supply power to the ring main unit in a single-way mode, and the complexity of the circuit is reduced.

When the expansion is needed, the ring main unit can be directly added at the tail end of the chain structure without reserving a breaker, so that the expansion limit is less 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 input terminal is used to connect with the input terminal of the ring main unit 300 in a power supply loop other than the power supply loop of the ring main unit 300, that is, the input terminal in the middle of the two ring main units in fig. 5 is connected by a wire represented by a dotted line. When the input power of the loop where one ring main unit is located fails, the input end connected with the input end of the ring main unit 300 in other power supply loops except the power supply loop of the ring main unit can be utilized to obtain electric energy from other power supply loops, so that the redundancy of the power supply system is increased.

In this embodiment, the redundant power supply system further includes three power distribution modules, each power distribution module includes three power distribution modules 400 corresponding to three power supply loops one to one, as shown in fig. 3, the three power distribution modules 400 in each dashed line frame form a group of power distribution modules, and the input end of each power distribution module 400 is directly connected with the output end of one ring main unit 300 in the corresponding power supply loop, without being accessed by an ATS. The 3 power distribution modules 400 in each group of power distribution modules are combined in pairs to supply power for the load by double power sources, so that the redundancy of the system is increased.

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

Illustratively, referring to fig. 6,3 power distribution modules 400 constitute a set of power distribution modules 400 having a capacity of 2+1. In one embodiment, the total capacity of each power distribution module 400 is 1500kVA, the power supply capacity required by each load 500 is 1000kVA, when all 3 power distribution modules 400 are operating normally, two output ends of a single power distribution module 400 output 500kVA to corresponding loads 500 respectively, the total output is 1000kVA, the load rate is 66.7%, at this time, the power supply capacities of two input ends of a single load 500 are 500kVA, and the total input is 1000kVA; when one power distribution module 400 fails, two loads 500 output by the power distribution module 400 cannot acquire power 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 increased from the original 500kVA to 1000kVA, the power supply capacity of two input ends of the remaining load 500 is still 500kVA, that is, each load 500 can still acquire the power supply capacity of 1000kVA, and two normally operating power distribution modules 400 all maintain the full load output of 1500kVA, and the load rate is 100%, so that the power input failure of a loop to which any one power distribution module 400 belongs does not affect the normal operation of the load, that is, the power supply of one power distribution module 400 is redundant. In some embodiments, there may be more power distribution modules 400 in each group of power distribution modules that are redundant.

Referring to fig. 6, the power distribution module 400 includes: uninterruptible power supply apparatus 410, energy storage unit 440, and low voltage power distribution cabinet 430 as an output power distribution cabinet. Alternatively, the output power distribution cabinet may be a low voltage power distribution cabinet 430 or other suitable power distribution cabinet, which is not limited by embodiments of the present application.

The output end of the ring main unit 300 is connected through the input end of the rectifying unit 411, the energy storage unit 440 is connected with one end of the direct current bus 414 through the charging and discharging unit 413, and the other end of the direct current bus 414 is connected with the low-voltage power distribution cabinet 430 through the inversion unit 412, so that redundant power supply is performed to the load through the low-voltage power distribution cabinet 430. Wherein the dc buses 414 included in each of 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 each of the partial power distribution modules in the same group may be connected in series to form a common dc bus.

The common dc bus 420 enables the multiple sets of ups devices 410 to cooperate with each other, and when a certain ups device fails, the circuit in which the ups device is located can still obtain electrical energy from the common dc bus 420, that is, different ups devices are backed up through the common dc bus 420, so that redundancy is improved.

Specifically, in the present embodiment, the uninterruptible power supply apparatus 410 includes a rectifying unit 411, an inverting unit 412, a dc bus 414, and a charging and discharging unit 413. The rectifying unit 411 converts the input alternating current into direct current by using a rectifier and outputs the direct current to the direct current bus 414; a dc bus 414 as a dc distribution conductor, to which a rectifying unit 411, an inverter unit 412, and a charging/discharging unit 413 are connected; an input end of the inversion unit 412 is connected to the direct current bus 414, and an inverter is adopted to convert direct current into alternating current for output; the charging and discharging unit 413 is characterized in that a DC/DC converter is used to implement DC/DC bidirectional conversion according to the operation state of the uninterruptible power supply, including the charging and discharging states of the energy storage unit 440, and other units supply power to the DC bus 414 or obtain power from the DC bus 414. The ups device 410 may be used to convert 10kV medium-voltage ac power into 380V low-voltage ac power, and the energy storage unit 440 may be an energy storage device that may store dc power, and specifically, the energy storage unit may be a chemical energy storage device, such as a lead storage battery, or may be a physical energy storage device, such as a flywheel energy storage device; the low-voltage power distribution cabinet 430 can be used for distributing 380V low-voltage alternating current to the load 500, so that each power distribution module 400 in each group of power distribution modules can output, and the power distribution modules are connected to two input ends of the load in a pairwise combination manner to supply power to the load by double power sources.

In this embodiment, a tie switch is disposed between the dc buses 414 that are used to form the common dc bus 420 in series, and the tie switch is used to control the ups device to be in an isolated state or a non-isolated state. When in an isolated state, the uninterrupted power supply can be overhauled or otherwise operated; when in the non-isolated state, the common dc bus 420 may be formed in series with other uninterruptible power supply devices so that uninterruptible power supply devices may obtain electrical energy from the common dc bus.

In this embodiment, as shown in fig. 6, the common dc bus 420 may also connect an external load 460 and an external power source 450 through a charging and discharging unit 413, where the external load 460 is a charging pile, and the external power source 450 is a solar power source; as another alternative, the external power source may be another kind of new energy source or a combination of various new energy sources, and further, the external power source may be a combination of a traditional power source and a new energy source. The external load is a charging pile, so that the novel energy automobile is convenient to use, and the environment is protected; the external power supply adopts the new energy combined with the energy storage unit to coordinate with the mains supply to carry out peak regulation and frequency modulation and even transmit power to the power grid company so as to carry out profit and reduce cost.

The following description is made regarding the use procedure of the power supply loop.

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

The closed control switch of looped netowrk cabinet is used for controlling the looped netowrk cabinet and is in operating condition, and when being in operating condition, the looped netowrk cabinet can provide the electric energy to the distribution module. For example, the control switches at the two input ends of any ring main unit are opened to separate the ring main unit from the working state, and then the two switches are closed to restore the ring main unit to the working state.

The control switches of all input ends of any ring main unit in the power supply loop are disconnected, and are used for controlling the disconnected ring main unit to be in an overhaul state, and at the moment, the power supply of the ring main unit is stopped, so that the ring main unit and a circuit of the ring main unit are convenient to overhaul.

In an aspect of the embodiment of the present application, in the two ring main units having a connection relationship, the control switches of the two connected input ends are turned off and are used for controlling the power supply loop to be in a capacity expansion state.

Referring to fig. 7, the original 3 original ring main units 300a of the power supply loop form a chain structure, and a new ring main unit 300b is added to the power supply loop for expansion. The control switches of the two input ends connected between the two original ring main units 300a with the connection relationship can be disconnected first, and the ring main units 300b can be newly added at the disconnection position.

Specifically, a chain structure formed by connecting three original ring main units 300a in series between two output ends of the power distribution cabinet 200 forms an annular structure, and fig. 7 turns off a control switch of two input ends connected between two original ring main units 300a having a connection relationship in an annular power supply loop, so that the power supply loop is in a capacity expansion state.

As shown in fig. 7, a new ring main unit 300b and a new power distribution module 400b corresponding to the new ring main unit are added at the position of the open loop, two control switches of the new ring main unit 300b are respectively connected with control switches of two input ends of the two original ring main units 300a which are opened, and capacity expansion can be completed by closing all the control switches.

Alternatively, for the original ring main unit 300a connected to the power distribution cabinet 200, both the input end of the original ring main unit 300a connected to the power distribution cabinet 200 and the control switch of the output end of the power distribution cabinet 200 may be disconnected, so that the power supply loop is in a capacity expansion state. And adding a new ring main unit 300b and a new power distribution module 400b corresponding to the new ring main unit at the position of opening the loop, connecting one of two control switches of the new ring main unit 300b with the control switch at the output end of the opened power distribution cabinet 200, connecting the other control switch with the control switch at the output end of the opened original ring main unit 300a, and closing all the control switches to finish capacity expansion.

Because the ring main unit can be powered by at least two input ends, when the control switch of one of the input ends is disconnected, the original ring main unit 300a can still be powered by the power distribution cabinet 200, so that the original ring main unit and the power distribution module connected with the original ring main unit can work normally in the capacity expansion process.

In the process of adding the power distribution module, the corresponding control switch is only required to be disconnected without reserving a breaker, and the capacity expansion between the original ring main units can be realized, and the capacity expansion between the original ring main units and the power distribution cabinet can be realized, so that the capacity expansion limitation is less, and the flexibility is high.

In some embodiments, only one of the two output ends of the power distribution cabinet 200 may be connected with the input end of the original ring main unit to form a chain structure, where the original ring main unit at the end of the chain structure has two input ends, one of the two input ends is in an unconnected state, so that the control switch of the unconnected input end is in a disconnected state, a newly-added ring main unit and a newly-added power distribution module corresponding to the newly-added ring main unit are added at the disconnected control switch position, the disconnected control switch is connected with the input end of the newly-added power distribution cabinet, and capacity expansion can be completed by closing all the control switches. Under the condition, in the process of adding the power distribution module, the corresponding control switch is disconnected without reserving a breaker, so that the flexibility of capacity expansion is improved.

And for other power supply loops, repeatedly implementing the process to expand the capacity, and respectively combining the newly-added power distribution module of each power supply loop with the other two newly-added power distribution modules to form two loads for double-power supply.

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

The power supply loop power supply can be the mains supply of a power grid, or can be a self-set generator, a solar power supply, a fuel cell and other suitable power supplies. The power supplies of the power supply loops in the multi-loop power supply redundant power supply system can be the same power supply or different power supplies, wherein part or all of the input power supplies are mutually independent power supplies.

As an example, taking the power supply for three power supply loops as shown in fig. 8, the present embodiment provides a structure of an input power source of a redundant power supply system for multi-loop power supply, which may include a first medium voltage utility power 101a, a second medium voltage utility power 101b, a generator parallel 102, a first ATS 103a, a second ATS 103b, and a third ATS 103c. The output ends of the first ATS 103a, the second ATS 103b and the third ATS 103c are respectively connected with the input ends of the first power distribution cabinet 200a, the second power distribution cabinet 200b and the third power distribution cabinet 200c, and the three power distribution cabinets respectively supply power for the three power supply loops. The power distribution cabinet comprises three power distribution cabinets, a power supply system and a power supply system, wherein the power consumption capacity of all loads of the three power distribution cabinets is N, the output electric quantity of two paths of commercial power is N respectively, and the output electric quantity of the parallel operation 102 of the power generator is also N; the first medium-voltage commercial power 101a and the second medium-voltage commercial power 101b are 10kV commercial power, and the generator parallel operation 102 is outputted by 8 10kV generators G. In some embodiments, the voltages of the first medium voltage utility power 101a, the second medium voltage utility power 101b, and the generators in the parallel operation 102 may be selected between 10kV and 35kV according to the power supply requirement of the circuit, for example, 10kV, 20kV, 35kV, etc. that meet the power supply requirement, and the number of parallel operation 102 may be configured according to the capacity of the load.

As shown in fig. 8, in this embodiment, one output end of the first medium voltage utility power 101a and the generator parallel machine 102 is connected to an input end of the first ATS 103a, an output end of the first ATS 103a is connected to an input end of the first power distribution cabinet 200a, another output end of the second medium voltage utility power 101b and the generator parallel machine 102 is connected to an input end of the second ATS 103b, and an output end of the second ATS 103b is connected to an input end of the second power distribution cabinet 200 b; the first power distribution cabinet 200a and the second power distribution cabinet 200b comprise 3 output ends, two output ends of the 3 output ends are used for forming a power supply loop with the ring main unit, the other output end is connected with the input end of the third ATS 103c, the output end of the third ATS 103c is connected with the input end of the third power distribution cabinet 200c, and the two output ends of the third power distribution cabinet 200c are used for forming the power supply loop with the ring main unit. Therefore, when the input power supply of any one power supply loop fails, the input power supplies of other power supply loops still can work normally, and the output power quantity of the input power supply can meet the power consumption quantity of all loads; in some embodiments, some or all of the input power sources in the 3 power supply loops are independent power sources, and each medium voltage power distribution cabinet 200 may be respectively powered by a commercial power source with an output power of N and/or a suitable generator set.

According to the above embodiment, as shown in fig. 9, through the hybrid design of the ring main unit 300 and ATS, a power supply system design with a load capacity of 2+1 can be implemented by 3 ATS, and in the prior art, 6 ATS are required to be disposed at the input ends of 6 power distribution modules. Accordingly, the present application uses fewer ATS than the prior art, and since the number of ATS is reduced, the number of circuit breakers of the power distribution cabinet 200 can also be reduced, thereby reducing the system cost.

In conjunction with the above embodiment, in fig. 9, any one of the first medium voltage utility power 101a and the second medium voltage utility power 101b fails, and the other utility power can supply power to the loop through the third ATS 103c. Furthermore, the first medium voltage commercial power 101a and the second medium voltage commercial power 101b are both failed, and the generator parallel machine 102 can still replace two paths of commercial power to supply power. In the independent power supply loop, when one of two lines of switch board output to looped netowrk cabinet breaks down, can cut off this line, and the circuit of the output of another output of switch board also can burden whole loop this moment, does not influence the power supply of distribution module. If a ring main unit 300 fails, at this time, no input is provided to the corresponding output power distribution module, and the UPS of the power distribution module can obtain the power of other UPS through the dc bus, so as to supply power to the load continuously. In summary, in the face of these four possible faults, the embodiments of the present application only lose a certain redundancy due to the faults, and can still supply power without interruption, so that it can be seen that the power supply system of the present application has high reliability.

The embodiment of the application also provides a power distribution device for multi-loop power supply, which comprises at least one group of power distribution modules, wherein 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 distribution module in the M distribution modules is directly connected with the output end of one ring main unit in a corresponding power supply loop, wherein the M distribution modules in each group of distribution modules are connected to the two input ends of a load in a pairwise combination mode, double-power supply is carried out on the load, and when any one of the distribution modules fails, the power supply of the load is not interrupted. The specific implementation can refer to the examples of fig. 3 and 4.

The power distribution module comprises uninterruptible power supply equipment and an energy storage unit. The uninterrupted power supply equipment comprises a rectifying unit, an inversion unit, a direct current bus and a charging and discharging unit. One end of the direct current bus is connected with the output end of the ring main unit through the rectifying unit, the energy storage unit is connected with one end of the direct current bus through the charging and discharging unit, and 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. In some embodiments, the output power distribution cabinet may be a low-voltage power distribution cabinet or other suitable power distribution cabinet, and a specific implementation may refer to the embodiment of fig. 6.

In some embodiments, the output power distribution cabinets of the two power distribution modules used for two-by-two combination in each group of power distribution modules are respectively connected to two input ends of the corresponding load, so as to perform dual-power supply on the load, and the specific implementation can refer to the embodiment of fig. 6.

In some embodiments, part or all of the dc buses included in each of the power distribution modules in the same group of power distribution modules are connected in series to form a common dc bus, and optionally, a tie switch is disposed between the dc buses connected in series to form the common dc bus, where the tie switch is used to control the uninterruptible power supply device to be in an isolated state or a non-isolated state. The specific implementation can be seen with reference to the example of fig. 6.

The public direct current bus can be used for connecting an external load or an external power supply through the charging and discharging unit, wherein the external load comprises a charging pile, the external power supply comprises a new energy power supply, and optionally, 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. The specific implementation can be seen with reference to the example of fig. 6.

It should be noted that, according to implementation requirements, each component/step described in the embodiments of the present application may be split into more components/steps, or two or more components/steps or part of operations of the components/steps may be combined into new components/steps, so as to achieve the objects of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the elements and method steps of the examples described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or as a combination of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present application.

The above embodiments are only for illustrating the embodiments of the present application, but not for limiting the embodiments of the present application, and various changes and modifications may be made by one skilled in the relevant art without departing from the spirit and scope of the embodiments of the present application, so that all equivalent technical solutions also fall within the scope of the embodiments of the present application, and the scope of the embodiments of the present application should be defined 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.