CN219145029U - Energy storage system with fault bypass function - Google Patents

Energy storage system with fault bypass function Download PDF

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Publication number
CN219145029U
CN219145029U CN202320152590.4U CN202320152590U CN219145029U CN 219145029 U CN219145029 U CN 219145029U CN 202320152590 U CN202320152590 U CN 202320152590U CN 219145029 U CN219145029 U CN 219145029U
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energy storage
converter
switch
fault
load
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CN202320152590.4U
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刘涛
王龙
郭浩浩
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Shanghai Elecon Intelligent Technology Co ltd
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Shanghai Elecon Intelligent Technology Co ltd
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Abstract

The utility model discloses an energy storage system with a fault bypass function, which relates to the technical field of energy storage and comprises a static change-over switch, an energy storage converter, an energy storage battery pack, a maintenance bypass switch and a fault bypass switch; the energy storage converter is connected with the energy storage battery pack and is used for charging the energy storage battery pack by utilizing the commercial power; the energy storage battery pack is used for supplying power to the load through the energy storage converter; the fault bypass switch is connected with the static change-over switch in parallel, and the maintenance bypass switch is arranged between the commercial power and the load. According to the utility model, the situation that the energy storage system enters a fault state and can not be in a normal working state any more once the SCR static change-over switch is in fault can be avoided, and the stability and reliability of the whole system are improved.

Description

Energy storage system with fault bypass function
Technical Field
The utility model relates to the technical field of energy storage, in particular to an energy storage system with a fault bypass function.
Background
At present, the energy storage device for the distributed application scene such as the base station can be provided with PQ grid-connected and V/F off-grid working modes, but the two working modes are not optimally designed according to the actual requirements of the distributed application scene such as the base station, and at present, different working modes are only switched according to different states of charge and discharge, when the battery is charged, the energy storage device is in PQ grid-connected operation, and when the battery is discharged, the energy storage device is switched into V/F off-grid operation, thus obviously realizing the operation by a plurality of times of actions of the SCR static seamless switch, however, the following technical problems are faced: once the SCR static seamless transfer switch fails, the energy storage device enters a failure state and cannot be in a normal working state any more.
Disclosure of Invention
Based on the technical problems, according to an aspect of the present utility model, there is provided an energy storage system with a fault bypass function, including a static change-over switch, an energy storage converter, an energy storage battery pack, a maintenance bypass switch and a fault bypass switch, wherein,
the static change-over switch is connected with the mains supply, the energy storage converter and the load and is used for disconnecting or connecting the mains supply;
the energy storage converter is connected with the energy storage battery pack and is used for charging the energy storage battery pack by utilizing the commercial power;
the energy storage battery pack is used for supplying power to the load through the energy storage converter;
the fault bypass switch is connected with the static change-over switch in parallel, and the maintenance bypass switch is arranged between the commercial power and the load.
In one possible embodiment, the energy storage converter comprises an AC/DC converter and a DC/DC converter, the AC/DC converter is connected to the DC/DC converter, the DC/DC converter is connected to the energy storage battery, the AC/DC converter is used for converting between alternating current and direct current, and the DC/DC converter is used for converting the electric energy output by the energy storage battery into direct current.
In one possible embodiment, the power converter further comprises a switching power supply, to which the energy storage converter and the static change-over switch are connected in each case, for supplying the load.
In one possible embodiment, the switching power supply is provided with an AC/DC converter.
In one possible embodiment, the static change-over switch is provided with an SCR controller, a circuit breaker and a thyristor, the thyristor and the circuit breaker being connected to the SCR controller respectively.
In one possible embodiment, the energy storage battery comprises a plurality of lithium iron phosphate cells connected in series.
In one possible embodiment, a backup battery pack is further included for powering the load.
In one possible embodiment, the battery backup is a lead acid battery.
In one possible embodiment, an input breaker is provided between the mains and the static transfer switch, and an output breaker is provided between the static transfer switch and the load.
In one possible embodiment, the input node of the maintenance bypass switch is arranged between the input breaker and the mains supply, and the output node of the maintenance bypass switch is arranged between the switching power supply and the load.
In one possible implementation, the static transfer switch is configured to: when the commercial power is normal and the current period is in a valley period of peak-valley power, the power supply mode is switched to a first networking working mode, wherein in the first networking working mode, the commercial power supplies power to the load and charges the energy storage battery pack.
In one possible implementation, the static transfer switch is configured to: when the commercial power is normal and the current period is in the peak section of peak-to-valley power, the power supply mode is switched to a second grid-connected working mode, and in the second grid-connected working mode, the commercial power does not supply power to the load, the commercial power charges the energy storage battery pack and the energy storage battery pack supplies power to the load.
In one possible implementation, the static transfer switch is configured to: when the commercial power is powered down, the power supply mode is switched to an off-grid working mode, wherein in the off-grid working mode, the energy storage battery pack is used for supplying power to the load through the energy storage converter.
In a possible implementation manner, when the mains supply is powered down and the static transfer switch fails, the fault bypass switch is closed and is in a standby state; and when the commercial power is recovered to be normal and the static change-over switch fails, the commercial power supplies power to the load through the fault bypass switch.
According to the embodiment of the utility model, the fault bypass switch is connected with the static change-over switch in parallel, so that the situation that the energy storage system enters a fault state and can not be in a normal working state any more once the SCR static change-over switch is in fault can be avoided, the overall stability and reliability of the system are improved, and the system can still work normally even when the SCR static change-over switch is in fault.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model as claimed. Other features and aspects of the present utility model will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.
Fig. 1 shows a schematic diagram of an energy storage system with a fault bypass function according to an embodiment of the utility model.
Fig. 2 shows a schematic diagram of a second energy storage system with a fault bypass function according to an embodiment of the utility model.
Detailed Description
Various exemplary embodiments, features and aspects of the utility model will be described in detail below with reference to the drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B, C, and may mean including any one or more elements selected from the group consisting of A, B and C.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better illustration of the utility model. It will be understood by those skilled in the art that the present utility model may be practiced without some of these specific details. In some instances, well known methods, procedures, components, and circuits have not been described in detail so as not to obscure the present utility model.
Referring to fig. 1, fig. 1 is a schematic diagram of an energy storage system with a fault bypass function according to an embodiment of the utility model.
As shown in fig. 1, the system includes a static transfer switch 10, an energy storage converter 20, an energy storage battery pack 30, a maintenance bypass switch S4, and a fault bypass switch S1, wherein,
the static change-over switch 10 is connected to the mains supply, the energy storage converter 20 and the load 40, and the static change-over switch 10 is used for disconnecting or connecting the mains supply;
the energy storage converter 20 is connected to the energy storage battery 30, and is configured to charge the energy storage battery 30 by using the mains supply;
the energy storage battery 30 is used for supplying power to the load 40 through the energy storage converter 20;
the fault bypass switch S1 is connected in parallel with the static transfer switch 10, and the maintenance bypass switch S4 is disposed between the utility power and the load 40.
According to the embodiment of the utility model, the fault bypass switch S1 is arranged in parallel with the static change-over switch 10, and when the static change-over switch 10 is in a fault state, the fault bypass switch S1 is closed, or when the static change-over switch 10 is in a normal working state, the fault bypass switch S1 is opened, so that the situation that an energy storage system enters a fault state and cannot be in a normal working state any more once the static change-over switch 10 is in a fault state can be avoided, the overall stability and reliability of the system are improved, and the system can still work normally even if the static change-over switch 10 is in a fault state, wherein the static change-over switch 10 is realized by adopting a silicon controlled rectifier (Silicon Controlled Rectifier, SCR for short).
It should be noted that, referring to fig. 2, the system further includes a maintenance bypass switch S4, where the maintenance bypass switch S4 is disposed between the utility power and the load 40, and the maintenance bypass switch S4 is disposed, so that maintenance of the system is facilitated. The embodiment of the utility model does not limit the specific implementation modes of the maintenance bypass switch S4 and the fault bypass switch S1, and a person skilled in the art can select a proper breaker to realize according to actual conditions and needs.
The specific implementation manners of the static change-over switch 10, the energy storage converter 20, the energy storage battery pack 30 and the fault bypass switch S1 are not limited in the embodiments of the present utility model, and those skilled in the art may adopt suitable implementation manners according to actual situations and needs.
The energy storage converter (Power Conversion System, PCS) 20 may be implemented by selecting appropriate mature devices or referring to the implementation in the related art as required, and the PCS may control the charging and discharging process of the battery to perform ac-dc conversion (dc-to-ac or ac-to-dc), and may directly supply the ac load without a power grid. Illustratively, the PCS may be comprised of a DC/AC bi-directional converter, a control unit, or the like, wherein the control unit may control the DC/AC bi-directional converter to perform DC-to-AC or AC-to-DC conversion, and the control unit may illustratively be implemented by a processing component, which in one example includes, but is not limited to, a separate processor, or a discrete component, or a combination of a processor and a discrete component. The processor may include a controller in an electronic device having the functionality to execute instructions, and may be implemented in any suitable manner, for example, by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements. Within the processor, the executable instructions may be executed by hardware circuits such as logic gates, switches, application specific integrated circuits (Application Specific Integrated Circuit, ASIC), programmable logic controllers, and embedded microcontrollers.
In one possible implementation manner, the energy storage converter 20 may include an AC/DC converter and a DC/DC converter, where the AC/DC converter is connected to the DC/DC converter, the DC/DC converter is connected to the energy storage battery set 30, and the AC/DC converter is used to convert the AC power and the DC power, and the DC/DC converter is used to convert the electric power output by the energy storage battery set into the DC power, and of course, embodiments of the present utility model are not limited to specific implementation manners of the DC/DC converter and the AC/DC converter, and those skilled in the art may use those in the related art to implement them.
In one possible embodiment, the static transfer switch 10 may be provided with an SCR controller, a circuit breaker, and a thyristor, the thyristor and the circuit breaker being connected to the SCR controller, respectively. The static switch 10 may be provided with an SCR controller, a circuit breaker, and a thyristor, wherein the thyristor and the circuit breaker are respectively connected with the SCR controller, and the present utility model is not limited to the specific embodiment of the static switch 10, and one skilled in the art may refer to the related art.
In one possible embodiment, the energy storage battery 30 includes a plurality of lithium iron phosphate batteries connected in series, and may of course also include other lithium ion batteries and lithium polymer batteries, which is not limited in this embodiment of the present utility model.
Illustratively, the load 40 may be a base station in a distributed application scenario.
Referring to fig. 2, fig. 2 shows a schematic diagram of a second energy storage system with a fault bypass function according to an embodiment of the utility model.
In one possible embodiment, as shown in fig. 2, the system may further comprise a switching power supply 50, and the energy storage converter 20 and the static change-over switch 10 are connected to the switching power supply 50, respectively, and the switching power supply 50 is used for supplying power to the load 40. It is worth noting that in one possible embodiment, the switching power supply 50 is provided with an AC/DC converter for converting AC power to DC power.
Further, as shown in fig. 2, the energy storage system of the present utility model further includes a backup battery 60, and the backup battery 60 is used to power the load 40. In one possible embodiment, the battery pack 60 may be a lead acid battery.
The utility model can be compatible with the standby battery pack 60 at the load end, reduces the use frequency of the standby battery pack 60, reduces the charge and discharge times of the standby battery pack 60, and prolongs the service life of the standby battery pack 60, thereby reducing the capacity of the standby battery pack 60 and the reconstruction cost.
In one possible embodiment, as shown in fig. 2, the apparatus further includes a first BATTERY management system (BATTERY MANAGEMENT SYSTEM, BMS) 70, where the first BATTERY management system 70 is connected to the energy storage converter 20, and is used to control the energy storage converter 20 to charge the energy storage BATTERY set 30, or control the energy storage converter 20 to perform dc-to-ac conversion on the electric energy output by the energy storage BATTERY set 30.
The embodiment of the utility model does not limit the specific implementation manner of the BMS, and a person skilled in the art can refer to the related technology for implementation, wherein the BMS can also prevent the battery from being overcharged and overdischarged, prolong the service life of the battery and monitor the state of the battery.
In one possible embodiment, as shown in fig. 2, an input breaker S2 may be disposed between the utility power and the static change-over switch 10, an output breaker S3 may be disposed between the static change-over switch 10 and the load 40, an input node of a maintenance bypass switch S4 is disposed between the input breaker S2 and the utility power, and an output node of the maintenance bypass switch S4 is disposed between the switching power supply 50 and the load 40; the input node of the fault bypass switch S1 is provided between the input breaker and the static change-over switch 10, and the output node of the fault bypass switch S1 is provided between the static change-over switch 10 and the output breaker S3.
In addition, it should be noted that, the specific implementation manner of the input breaker S2 and the output breaker S3 is not limited in the embodiment of the present utility model, and a person skilled in the art may select a suitable breaker to implement according to the actual situation and needs.
In one possible implementation, the static transfer switch 10 may be configured to: when the commercial power is normal and the current period is in the valley period of peak-valley power, the power supply mode is switched to a first parallel network working mode, wherein in the first parallel network working mode, the commercial power supplies power to the load 40 and charges the energy storage battery pack 30.
In one possible implementation, the static transfer switch 10 may be configured to: when the commercial power is normal and the current period is in the peak section of the peak-to-valley power, the power supply mode is switched to a second grid-connected working mode, and in the second grid-connected working mode, the commercial power does not supply power to the load 40, the commercial power charges the energy storage battery pack 30, and the energy storage battery pack 30 supplies power to the load 40.
In one possible implementation, the static transfer switch 10 may be configured to: when the mains supply is powered down, the power supply mode is switched to an off-grid operation mode, wherein in the off-grid operation mode, the energy storage battery pack 30 is used for supplying power to the load 40 through the energy storage converter 20.
In a possible implementation manner, when the mains supply is powered down and the static transfer switch 10 fails, the fault bypass switch S1 is closed and is in a standby state; when the utility power returns to normal and the static change-over switch 10 fails, the utility power supplies power to the load 40 through the fault bypass switch S1.
By the mode, the system of the embodiment of the utility model does not switch different working modes according to the charge and discharge states, but switches according to whether the mains supply is normal or not, and the energy storage system works in the grid-connected working mode no matter what state the mains supply is charged or discharged if the mains supply is normal; however, once the mains is disconnected, the off-grid mode of operation is established. Meanwhile, if the SCR static change-over switch 10 fails, the failure bypass switch S1 is actively closed and bypasses the SCR static change-over switch, so that the energy storage system can still continue to work and is in a grid-connected working mode, and the stability and reliability of the energy storage system are improved to the greatest extent in the novel grid-connected and off-grid working mode.
The foregoing description of embodiments of the utility model has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (10)

1. An energy storage system with a fault bypass function is characterized by comprising a static change-over switch, an energy storage converter, an energy storage battery pack, a maintenance bypass switch and a fault bypass switch, wherein,
the static change-over switch is connected with the mains supply, the energy storage converter and the load and is used for disconnecting or connecting the mains supply;
the energy storage converter is connected with the energy storage battery pack and is used for charging the energy storage battery pack by utilizing the commercial power;
the energy storage battery pack is used for supplying power to the load through the energy storage converter; the fault bypass switch is connected with the static change-over switch in parallel, and the maintenance bypass switch is arranged between the commercial power and the load.
2. The energy storage system with fault bypass function according to claim 1, wherein the energy storage converter comprises an AC/DC converter and a DC/DC converter, the AC/DC converter is connected to the DC/DC converter, the DC/DC converter is connected to the energy storage battery, the AC/DC converter is used for converting between AC and DC, and the DC/DC converter is used for converting the electric energy output by the energy storage battery into DC.
3. The energy storage system with fault bypass function according to claim 1, further comprising a switching power supply, the energy storage converter and the static change-over switch being respectively connected to the switching power supply, the switching power supply being configured to supply power to a load.
4. The energy storage system with fault bypass function of claim 3, wherein the switching power supply is provided with an AC/DC converter.
5. The energy storage system with fault bypass function according to claim 1, wherein the static change-over switch is provided with an SCR controller, a circuit breaker and a thyristor, the thyristor and the circuit breaker being connected to the SCR controller respectively.
6. The energy storage system with fault bypass function of claim 1, wherein the energy storage battery pack comprises a plurality of lithium iron phosphate cells connected in series.
7. The energy storage system with fault bypass function of claim 1, further comprising a backup battery for powering the load.
8. The energy storage system with fault bypass function of claim 7, wherein the battery backup is a lead acid battery.
9. The energy storage system with fault bypass function according to claim 1, wherein an input breaker is provided between the mains and the static transfer switch, and an output breaker is provided between the static transfer switch and the load.
10. The energy storage system with fault bypass function of claim 9, wherein an input node of the service bypass switch is disposed between an input circuit breaker and mains, and an output node of the service bypass switch is disposed between a switching power supply and the load.
CN202320152590.4U 2023-01-17 2023-01-17 Energy storage system with fault bypass function Active CN219145029U (en)

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Application Number Priority Date Filing Date Title
CN202320152590.4U CN219145029U (en) 2023-01-17 2023-01-17 Energy storage system with fault bypass function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320152590.4U CN219145029U (en) 2023-01-17 2023-01-17 Energy storage system with fault bypass function

Publications (1)

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CN219145029U true CN219145029U (en) 2023-06-06

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