Energy storage power distribution device, energy storage power distribution cabinet and energy storage system

Abstract

The utility model discloses an energy storage power distribution device, an energy storage power distribution cabinet and an energy storage system, and relates to the field of energy storage, the energy storage power distribution device comprises an AC main circuit breaker, a first end is connected with commercial power, a second end is connected with an AC end of an energy storage converter, and the AC main circuit breaker is used for connecting and disconnecting the commercial power; the direct current side of the energy storage converter is connected with the first ends of the multiple direct current circuit breakers, and the energy storage converter is used for converting alternating current into direct current; the number of the direct current circuit breakers is the same as that of the direct current power supply units, the direct current circuit breakers are in one-to-one correspondence with the direct current power supply units, and the second end of each direct current circuit breaker is connected with the corresponding direct current power supply unit and used for switching on and off direct current for supplying power to the corresponding direct current power supply unit. By arranging the direct current circuit breaker on the line where each direct current power supply unit is located, the situation that power supply to all the direct current power supply units is cut off after a certain branch breaks down can be avoided, and the operation stability is improved.

Description

Technical Field

[0001] This utility model relates to the field of energy storage, and in particular to an energy storage power distribution device, an energy storage power distribution cabinet, and an energy storage system. Background Technology

[0002] As the energy storage industry grows in scale, energy storage systems place increasingly precise demands on the control of the battery side by the PCS (Power Conversion System). Energy storage distribution devices convert AC to DC, with multiple branches on the DC side, connected to the battery side. Currently, most combiner cabinets on the market collect DC power from the PCS, pass it through a main circuit breaker, and then distribute it to the various branches. If a current fault is detected on a branch, a command is sent to the PCS to stop it, causing the entire system to shut down. This affects the normal operation of non-faulty battery clusters, resulting in poor operational stability. Utility Model Content

[0003] The purpose of this application is to provide an energy storage power distribution device, energy storage power distribution cabinet and energy storage system, which can avoid disconnecting all power supply to DC power supply units due to a fault in a certain branch, thereby improving the stability of operation.

[0004] To address the aforementioned technical problems, this application provides an energy storage and power distribution device, comprising:

[0005] The AC main circuit breaker has its first terminal connected to the mains power and its second terminal connected to the AC terminal of the energy storage converter, and is used to switch the mains power supply on and off.

[0006] The energy storage converter has its DC side connected to the first terminals of multiple DC circuit breakers, and is used to convert AC power into DC power.

[0007] The number of DC circuit breakers is the same as the number of DC power supply units and corresponds one-to-one. The second terminal of each DC circuit breaker is connected to the corresponding DC power supply unit and is used to switch the DC power supply to the corresponding DC power supply unit.

[0008] On the other hand, it also includes multiple AC sub-circuit breakers, the number of which is the same as the number of AC power supply units and corresponds one-to-one.

[0009] The first terminal of each of the AC sub-circuit breakers is connected to the second terminal of the AC main circuit breaker, and the second terminal of each of the AC sub-circuit breakers is connected to the corresponding AC power supply unit, wherein the AC power supply unit includes at least one of an air conditioning system and a lighting system;

[0010] The AC sub-circuit breaker is used to switch the AC power supply to the corresponding AC power supply unit.

[0011] On the other hand, it also includes protection circuit breakers and AC surge protectors;

[0012] The first terminal of the protective circuit breaker is connected to the second terminal of the AC main circuit breaker, the second terminal of the circuit breaker is connected to the first terminal of the AC surge protector, and the second terminal of the AC surge protector is grounded.

[0013] The AC surge protector is used to protect the AC power supply unit.

[0014] On the other hand, it also includes backup power and transfer switches;

[0015] The first terminal of the transfer switch is connected to the backup power supply, the second terminal of the transfer switch is connected to the mains power supply, and the third terminal of the transfer switch is connected to each emergency power supply unit, which includes an emergency lighting system.

[0016] The changeover switch is used to connect its first and third terminals so that the backup power supply can supply power to the emergency power supply unit, or to connect its second and third terminals so that the mains power can supply power to the emergency power supply unit.

[0017] On the other hand, the DC circuit breaker includes a first circuit breaker and a second circuit breaker;

[0018] The first terminal of the first circuit breaker is connected to the positive terminal of the DC side of the energy storage converter, the second terminal of the first circuit breaker is connected to the positive terminal of the DC power supply unit, the first terminal of the second circuit breaker is connected to the negative terminal of the DC side of the energy storage converter, and the second terminal of the second circuit breaker is connected to the negative terminal of the DC power supply unit.

[0019] The first circuit breaker and the second circuit breaker are simultaneously turned on and off. The first circuit breaker and the second circuit breaker are used to supply power to the DC power supply unit when they are turned on, and to stop supplying power to the DC power supply unit when they are turned off.

[0020] On the other hand, the DC circuit breaker also includes a status switch;

[0021] The first, second, and third terminals of the status switch are all connected to the controller.

[0022] The status switch is used to connect its first end to its second end when the first circuit breaker and the second circuit breaker are turned on, and to connect its first end to its third end when the first circuit breaker and the second circuit breaker are turned off.

[0023] On the other hand, the DC circuit breaker also includes a shunt trip controller;

[0024] The first terminal of the shunt trip controller is connected to the DC side of the energy storage converter, and the second terminal is connected to the DC power supply unit.

[0025] The shunt trip controller is used to forcibly disconnect the energy storage converter from the DC power supply unit.

[0026] On the other hand, it also includes fuses and surge protectors;

[0027] The first end of the fuse is connected to the DC side of the energy storage converter, and the second end is connected to the first end of the lightning surge protector. The second end of the lightning surge protector is grounded.

[0028] The fuse is used for overcurrent protection, and the surge protector is used for overvoltage protection.

[0029] To address the aforementioned technical problems, this application also provides an energy storage distribution cabinet, including a cabinet body and the aforementioned energy storage distribution device.

[0030] To address the aforementioned technical problems, this application also provides an energy storage system, including the aforementioned energy storage distribution cabinet.

[0031] This application provides an energy storage power distribution device, an energy storage distribution cabinet, and an energy storage system, relating to the field of energy storage. It includes an AC main circuit breaker, with its first terminal connected to the mains power and its second terminal connected to the AC terminal of an energy storage converter, used for switching the mains power supply on and off; an energy storage converter, with its DC side connected to the first terminals of multiple DC circuit breakers, used for converting AC power to DC power; and DC circuit breakers, the number of which corresponds one-to-one with the number of DC power supply units, with the second terminal of each DC circuit breaker connected to the corresponding DC power supply unit, used for switching the DC power supply to that unit on and off. By installing a DC circuit breaker on the line where each DC power supply unit is located, the disconnection of all power supply to the DC power supply units due to a fault in one branch can be avoided, improving operational stability. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This application provides a structural schematic diagram of an energy storage and power distribution device;

[0034] Figure 2 A schematic diagram of the structure of the communication side provided in this application;

[0035] Figure 3 Another schematic diagram of the communication side provided in this application;

[0036] Figure 4 A schematic diagram of a changeover switch provided in this application;

[0037] Figure 5 This application provides a schematic diagram of the structure of a DC circuit breaker;

[0038] Figure 6 A schematic diagram of another DC circuit breaker provided in this application;

[0039] Figure 7 This is a structural schematic diagram of an energy storage distribution cabinet provided in this application. Detailed Implementation

[0040] The core of this application is to provide an energy storage power distribution device, energy storage power distribution cabinet and energy storage system, which can avoid disconnecting all power supply to DC power supply units due to a fault in a certain branch, thereby improving the stability of operation.

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] Figure 1 This application provides a schematic diagram of the structure of an energy storage and distribution device, which includes:

[0043] AC main circuit breaker 1, with its first terminal connected to the mains power and its second terminal connected to the AC terminal of energy storage converter 2, is used to switch the mains power supply on and off.

[0044] The energy storage converter 2 is connected to the first end of multiple DC circuit breakers 3 on its DC side, and is used to convert AC power into DC power.

[0045] The number of DC circuit breakers 3 is the same as the number of DC power supply units and they correspond one-to-one. The second end of each DC circuit breaker 3 is connected to the corresponding DC power supply unit and is used to switch the DC power supply to the corresponding DC power supply unit.

[0046] As the energy storage industry grows in scale, energy storage systems place increasingly precise demands on the control of the battery side by the PCS (Power Conversion System). Energy storage distribution devices convert AC to DC, with multiple branches on the DC side, connected to the battery side. Currently, most combiner cabinets on the market collect DC power from the PCS, pass it through a main circuit breaker, and then distribute it to the various branches. If a current fault is detected on a branch, a command is sent to the PCS to stop it, causing the entire system to shut down. This affects the normal operation of non-faulty battery clusters, resulting in poor operational stability.

[0047] This application provides a DC circuit breaker 3 on each DC branch. If a fault occurs on the branch where the DC circuit breaker 3 is located, the fault may be in the line or the DC power supply unit. After the fault occurs, the DC circuit breaker 3 on that branch can be controlled to open. Opening only the DC circuit breaker 3 on the branch can avoid affecting the normal operation of other DC branches.

[0048] After the energy storage converter 2 converts the AC power to DC power, it supplies power to the DC power supply unit, which can be a battery cluster.

[0049] This application provides an energy storage power distribution device, relating to the field of energy storage, including an AC main circuit breaker 1, with its first end connected to the mains power and its second end connected to the AC end of an energy storage converter 2, used for switching the mains power supply on and off; the energy storage converter 2, with its DC side connected to the first ends of multiple DC circuit breakers 3, used for converting AC power to DC power; and DC circuit breakers 3, the number of which is the same as the number of DC power supply units and corresponds one-to-one, with the second end of each DC circuit breaker 3 connected to the corresponding DC power supply unit, used for switching the DC power supply to the corresponding DC power supply unit on and off. By installing a DC circuit breaker 3 on the line where each DC power supply unit is located, the power supply to all DC power supply units can be prevented from being interrupted due to a fault in a certain branch, thus improving operational stability.

[0050] Based on the above embodiments:

[0051] Figure 2 A schematic diagram of the structure of the communication side provided in this application;

[0052] In some embodiments, a plurality of AC sub-circuit breakers 4 are also included, the number of AC sub-circuit breakers 4 being the same as the number of AC power supply units and corresponding one-to-one;

[0053] The first terminal of each AC sub-circuit 4 is connected to the second terminal of the AC main circuit breaker 1, and the second terminal of each AC sub-circuit breaker 4 is connected to the corresponding AC power supply unit, which includes at least one of the air conditioning system and the lighting system.

[0054] The AC sub-circuit 4 is used to switch the AC power supply to the corresponding AC power supply unit.

[0055] In addition, mains power can also supply power to AC equipment, which can power devices such as air conditioners or lighting that require AC power. This direct power supply to the AC power supply unit can be achieved without the need for conversion via the energy storage converter 2. To improve the stability of the AC power supply to the AC power supply unit, an AC sub-circuit breaker 4 is installed on each AC branch. In the event of a fault on a given AC branch, the corresponding AC sub-circuit breaker 4 can be disconnected. Disconnecting only one AC sub-circuit breaker 4 improves the stability of the power supply.

[0056] Figure 3 A schematic diagram of another communication side provided in this application. Figure 4 A schematic diagram of the structure of a changeover switch 8 provided in this application;

[0057] In some embodiments, the device also includes a protective circuit breaker 5 and an AC surge protector 6;

[0058] The first terminal of the protective circuit breaker 5 is connected to the second terminal of the AC main circuit breaker 1, the second terminal of the circuit breaker is connected to the first terminal of the AC surge protector 6, and the second terminal of the AC surge protector 6 is grounded.

[0059] The AC surge protector 6 is used to protect the AC power supply unit.

[0060] To prevent damage to AC power supply equipment caused by excessive AC current, an AC surge protector 6 is installed to prevent damage to the AC power supply unit from surge current. The AC surge protector 6 starts working when the protective circuit breaker 5 is closed.

[0061] In some embodiments, a backup power supply 7 and a transfer switch 8 are also included;

[0062] The first terminal of the transfer switch 8 is connected to the backup power supply 7, the second terminal of the transfer switch 8 is connected to the mains power, and the third terminal of the transfer switch 8 is connected to each emergency power supply unit, which includes an emergency lighting system.

[0063] The changeover switch 8 is used to connect its first and third terminals so that the backup power supply 7 can supply power to the emergency power supply unit, or to connect its second and third terminals so that the mains power can supply power to the emergency power supply unit.

[0064] When the main power supply fails or is interrupted, the transfer switch 8 can automatically switch to the backup power supply 7, which is a UPS (Uninterruptible Power System) that can supply power to the emergency power supply unit, which can supply power to the emergency lighting system. If the mains power fails, the backup power supply 7 will provide power, thus improving the stability of the power supply.

[0065] In the transfer switch, the 1, 3, 5, N on the left and the 1, 3, 5, N on the right correspond to the backup power supply 7 and the transfer switch 8, respectively.

[0066] In some embodiments, the DC circuit breaker 3 includes a first circuit breaker S1 and a second circuit breaker S2;

[0067] The first terminal of the first circuit breaker S1 is connected to the positive terminal of the DC side of the energy storage converter 2, the second terminal of the first circuit breaker S1 is connected to the positive terminal of the DC power supply unit, the first terminal of the second circuit breaker S2 is connected to the negative terminal of the DC side of the energy storage converter 2, and the second terminal of the second circuit breaker S2 is connected to the negative terminal of the DC power supply unit.

[0068] The first circuit breaker S1 and the second circuit breaker S2 are simultaneously turned on and off. The first circuit breaker S1 and the second circuit breaker S2 are used to supply power to the DC power supply unit when they are turned on, and to stop supplying power to the DC power supply unit when they are turned off.

[0069] The DC circuit breaker 3 is equipped with two circuit breakers. The first circuit breaker S1 and the second circuit breaker S2 are connected to the positive and negative lines, respectively, and open and close the positive and negative lines. When it is necessary to disconnect the DC power supply, the first circuit breaker S1 and the second circuit breaker S2 in the DC circuit breaker 3 control the closing and opening of the circuit breaker by receiving remote control signals, electrical signals, or mechanical commands. By opening the first circuit breaker S1 and the second circuit breaker S2, the DC power supply is disconnected, preventing the fault from escalating.

[0070] In some embodiments, the DC circuit breaker 3 further includes a status switch S3;

[0071] The first, second, and third terminals of the status switch S3 are all connected to the controller.

[0072] The status switch S3 is used to connect its first terminal to its second terminal when the first circuit breaker S1 and the second circuit breaker S2 are turned on, and to connect its first terminal to its third terminal when the first circuit breaker S1 and the second circuit breaker S2 are turned off.

[0073] The state switch S3 has three terminals, which provide feedback to the controller regarding the states of the first circuit breaker S1 and the second circuit breaker S2. The signals fed back to the controller by state switch S3 when the first circuit breaker S1 and the second circuit breaker S2 are on and off are different. Specifically, the fixed terminal of the contacts in state switch S3 is the first terminal, the first movable terminal is the second terminal, and the second movable terminal is the third terminal. Connecting the fixed terminal to the first movable terminal or to the second movable terminal represents different states.

[0074] The status switch S3 is synchronized with the opening and closing of the DC circuit breaker 3, and provides feedback on the status of the DC circuit breaker 3 to the controller.

[0075] In some embodiments, the DC circuit breaker 3 further includes a shunt trip controller S4;

[0076] The first terminal of the shunt trip controller S4 is connected to the DC side of the energy storage converter 2, and the second terminal is connected to the DC power supply unit.

[0077] The shunt trip controller S4 is used to forcibly disconnect the connection between the energy storage converter 2 and the DC power supply unit.

[0078] In order to prevent the circuit breaker from failing to trip when the first circuit breaker S1 and the second circuit breaker S2 malfunction, a shunt trip controller S4 is provided. In an emergency, it can forcibly disconnect the connection between the energy storage converter 2 and the DC power supply unit to prevent the fault from escalating.

[0079] In some embodiments, a fuse 31 and a surge protector 32 are also included;

[0080] The first end of the fuse 31 is connected to the DC side of the energy storage converter 2, and the second end is connected to the first end of the surge protector 32. The second end of the surge protector 32 is grounded.

[0081] Fuse 31 is used for overcurrent protection, and surge protector 32 is used for overvoltage protection.

[0082] Fuse 31 provides overcurrent protection to prevent circuit damage due to open circuits or overloads. Surge protector 32 protects electronic equipment from lightning or other transient overvoltages.

[0083] Figure 6 This application provides a structural schematic diagram of an energy storage distribution cabinet, which includes a cabinet body and the aforementioned energy storage distribution device.

[0084] Please refer to the above embodiments for a description of the energy storage distribution cabinet provided in this application, and it will not be repeated here.

[0085] This technology comprises a cabinet, an AC distribution side, and a DC side. The DC side is located at the bottom of the cabinet, while the AC distribution side is located at the top. This design offers the advantages of separating high-voltage DC and AC power distribution, and placing the DC side at the bottom facilitates power line connections (power lines are thicker, requiring larger bending radii and incurring higher costs). The DC side is equipped with the necessary DC circuit breakers and surge protectors for each branch (protecting electronic equipment from lightning or other transient overvoltages). The DC circuit breakers are equipped with remote control opening and closing functions. The AC distribution side is equipped with components such as a UPS, AC circuit breaker, relays, terminal blocks, and transfer switches. The UPS can provide emergency power in the event of a power outage.

[0086] The current of each branch on the PCS side reaches the battery side through the DC circuit breaker. A surge protector is installed between the PCS and the DC circuit breaker. A single DC circuit breaker controls a single cluster of lines, achieving precise control and protection.

[0087] This application also provides an energy storage system, including the aforementioned energy storage distribution cabinet.

[0088] The description of the energy storage system provided in this application is based on the above embodiments and will not be repeated here.

[0089] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0090] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes said element.

[0091] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy storage and power distribution device, characterized in that, include: The AC main circuit breaker has its first terminal connected to the mains power and its second terminal connected to the AC terminal of the energy storage converter, and is used to switch the mains power supply on and off. The energy storage converter has its DC side connected to the first terminals of multiple DC circuit breakers, and is used to convert AC power into DC power. The number of DC circuit breakers is the same as the number of DC power supply units and corresponds one-to-one. The second terminal of each DC circuit breaker is connected to the corresponding DC power supply unit and is used to switch the DC power supply to the corresponding DC power supply unit.

2. The energy storage and power distribution device as described in claim 1, characterized in that, It also includes multiple AC sub-circuit breakers, the number of which is the same as the number of AC power supply units and corresponds one-to-one; The first terminal of each of the AC sub-circuit breakers is connected to the second terminal of the AC main circuit breaker, and the second terminal of each of the AC sub-circuit breakers is connected to the corresponding AC power supply unit, wherein the AC power supply unit includes at least one of an air conditioning system and a lighting system; The AC sub-circuit breaker is used to switch the AC power supply to the corresponding AC power supply unit.

3. The energy storage and power distribution device as described in claim 2, characterized in that, It also includes protective circuit breakers and AC surge protectors; The first terminal of the protective circuit breaker is connected to the second terminal of the AC main circuit breaker, the second terminal of the protective circuit breaker is connected to the first terminal of the AC surge protector, and the second terminal of the AC surge protector is grounded. The AC surge protector is used to protect the AC power supply unit.

4. The energy storage and power distribution device as described in claim 1, characterized in that, It also includes a backup power supply and a transfer switch; The first terminal of the transfer switch is connected to the backup power supply, the second terminal of the transfer switch is connected to the mains power supply, and the third terminal of the transfer switch is connected to each emergency power supply unit, which includes an emergency lighting system. The changeover switch is used to connect its first and third terminals so that the backup power supply can supply power to the emergency power supply unit, or to connect its second and third terminals so that the mains power can supply power to the emergency power supply unit.

5. The energy storage and power distribution device as described in any one of claims 1 to 4, characterized in that, The DC circuit breaker includes a first circuit breaker and a second circuit breaker; The first terminal of the first circuit breaker is connected to the positive terminal of the DC side of the energy storage converter, the second terminal of the first circuit breaker is connected to the positive terminal of the DC power supply unit, the first terminal of the second circuit breaker is connected to the negative terminal of the DC side of the energy storage converter, and the second terminal of the second circuit breaker is connected to the negative terminal of the DC power supply unit. The first circuit breaker and the second circuit breaker are simultaneously turned on and off. The first circuit breaker and the second circuit breaker are used to supply power to the DC power supply unit when they are turned on, and to stop supplying power to the DC power supply unit when they are turned off.

6. The energy storage and power distribution device as described in claim 5, characterized in that, The DC circuit breaker also includes a status switch; The first, second, and third terminals of the status switch are all connected to the controller. The status switch is used to connect its first end to its second end when the first circuit breaker and the second circuit breaker are turned on, and to connect its first end to its third end when the first circuit breaker and the second circuit breaker are turned off.

7. The energy storage and power distribution device as described in claim 5, characterized in that, The DC circuit breaker also includes a shunt trip controller; The first terminal of the shunt trip controller is connected to the DC side of the energy storage converter, and the second terminal is connected to the DC power supply unit. The shunt trip controller is used to forcibly disconnect the energy storage converter from the DC power supply unit.

8. The energy storage and power distribution device as described in claim 5, characterized in that, It also includes fuses and surge protectors; The first end of the fuse is connected to the DC side of the energy storage converter, and the second end is connected to the first end of the lightning surge protector. The second end of the lightning surge protector is grounded. The fuse is used for overcurrent protection, and the surge protector is used for overvoltage protection.

9. An energy storage distribution cabinet, characterized in that, It includes a cabinet and an energy storage and power distribution device as described in any one of claims 1 to 8.

10. An energy storage system, characterized in that, Includes the energy storage distribution cabinet as described in claim 9.

Images