CN111969708A - Battery replacement station protection system and protection method - Google Patents
Battery replacement station protection system and protection method Download PDFInfo
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- CN111969708A CN111969708A CN202010699946.7A CN202010699946A CN111969708A CN 111969708 A CN111969708 A CN 111969708A CN 202010699946 A CN202010699946 A CN 202010699946A CN 111969708 A CN111969708 A CN 111969708A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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Abstract
The invention discloses a power station replacing protection system, which comprises: the power supply and distribution device, the uninterrupted power supply, the battery replacement control device, the battery replacement execution device, the current conversion device and the power battery storage device; the power supply and distribution device is respectively and electrically connected with the uninterruptible power supply, the battery replacement control device, the battery replacement execution device and the current conversion device; the power supply and distribution device is used for supplying electric energy to the battery replacement control device and the battery replacement execution device; the uninterruptible power supply is also electrically connected with the power switching control device and is used for providing electric energy for the power supply and distribution device and the power switching control device when the power grid loses power; the power switching control device is respectively in communication connection with the power supply and distribution device, the power switching execution device and the current conversion device; and the power battery storage device is electrically connected with the current conversion device. The power battery is used for supplying power, and the power station can be supported to continuously change the power for multiple times. The UPS mainly supplies power to the power conversion control device, so that the capacity of the UPS can be very small, and the cost and the size of the UPS are reduced.
Description
Technical Field
The invention relates to the technical field of power station replacement protection, in particular to a power station replacement protection system and a power station replacement protection method.
Background
In recent years, with the development of new energy automobiles vigorously promoted by the country, the development of the battery replacement station is greatly driven, and the safety of the battery replacement station is more and more important. In order to ensure the safety of the power switching station in the using process, the uninterruptible power supply has become the mainstream configuration of the power switching station.
And on one hand, the power supply and distribution system is used for charging power batteries in the power changing station, and on the other hand, the power supply and distribution system supplies power to all subsystems in the power changing station to complete corresponding functions. When an external power grid is powered off due to reasons such as a fault, if an Uninterrupted Power Supply (UPS) is not provided in a power conversion station, the power conversion station is in a complete power loss state, and the power conversion station cannot continue to convert power, information is lost, and other consequences are caused. If the battery replacement station is internally provided with the UPS, if the capacity of the UPS is smaller, only partial information processing and storing functions can be supported, and the battery replacement process cannot be supported; if the capacity of the UPS is large, the functions of information processing and storage can be supported, and meanwhile, the current battery replacement process can be continuously completed, but the cost and the size are increased due to the large capacity of the UPS, and in addition, the stored electric quantity in the UPS can not support the continuous battery replacement for multiple times preferentially. At present, most of power conversion stations are provided with small UPS (uninterrupted power supply) to only support information storage and fault processing when a power grid is powered off.
Therefore, it is urgently needed to provide a technical scheme of a power conversion station protection system and a protection method, which can ensure normal operation of electric equipment in a power conversion station when a power grid is powered off, and avoid damage to the electric equipment due to sudden power failure.
Disclosure of Invention
If the UPS is not matched in the power conversion station, information loss and power conversion failure can be caused when the power grid is powered off; if the small-capacity UPS is equipped, the information processing and the alarm signal sending can be supported, but the current battery replacement process cannot be continuously completed; if a large-capacity UPS is equipped, the information processing can be supported and the current battery replacement process can be continuously completed, but the battery replacement can not be supported for multiple times, and the large-capacity UPS can also cause the increase of the cost and the volume.
The invention solves the problem that the power can not be continuously replaced when the power grid of the power replacement station is powered off without using a large-capacity UPS. In order to solve the problems in the prior art, the invention provides a power station replacement protection system, which comprises: the power supply and distribution device, the uninterrupted power supply, the battery replacement control device, the battery replacement execution device, the current conversion device and the power battery storage device;
the power supply and distribution device is electrically connected with the uninterruptible power supply, the battery replacement control device, the battery replacement execution device and the current conversion device respectively; the power supply and distribution device is used for providing electric energy for the battery replacement control device and the battery replacement execution device;
the uninterruptible power supply is also electrically connected with the power switching control device and is used for providing electric energy for the power supply and distribution device and the power switching control device when the power grid loses power;
the power conversion control device is respectively in communication connection with the power supply and distribution device, the power conversion execution device and the current conversion device;
the power battery storage device is electrically connected with the current conversion device, and the current conversion device is used for converting the electric energy in the power battery storage device into the electric energy used by the power supply and distribution device when the power grid loses power.
Further, the power battery storage device comprises: a first partition and a second partition;
the first partition is used for placing a power battery without faults; the second partition is used for placing a power battery with a fault.
Further, the power battery includes: the energy storage unit and the battery management unit;
the energy storage unit is electrically connected with the current conversion device; the battery management unit is in communication connection with the current conversion device.
Further, the current conversion device is a bidirectional current conversion device, and is used for converting alternating current of the power grid into direct current of the energy storage unit when the power grid is powered on, and converting electric energy of the energy storage unit into alternating current used by the power supply and distribution device when the power grid is powered off.
Further, still include: a transformer;
the high-voltage end of the transformer is used for being connected with the high voltage of a power grid, the low-voltage end of the transformer is connected with the power supply and distribution device, and the transformer is used for converting the high-voltage power of the power grid into the voltage grade corresponding to the power supply and distribution device.
Further, the working voltage of the power supply and distribution device is 380V.
On the other hand, the invention provides a power swapping station protection method, which is applied to any one of the power swapping station protection systems, and the method comprises the following steps:
the power supply and distribution device acquires the state information of each group of power batteries in the first partition through the current conversion device, wherein the state information comprises: fault information;
the power supply and distribution device judges whether each group of power batteries has faults or not according to the state information;
if the power battery fails, sending address information in the failure information to a battery swapping execution device through a battery swapping control device;
and the battery swapping execution device moves the power battery with the fault to a second partition according to the address information in the fault information.
Further, still include:
if the power batteries in the first partition do not have faults, the power supply and distribution device judges whether a power grid is powered off or not;
if the power grid is powered off, an uninterruptible power supply supplies power to the power supply and distribution device instantly, and the power supply and distribution device sends a discharge instruction to the current conversion device through the power exchange control device;
and the current conversion device supplies power to the power supply and distribution device by controlling the power battery of the first subarea according to the received discharge instruction until the power grid is powered on or the power of the power battery of the first subarea is exhausted.
Further, the state information includes: charge amount information;
the method further comprises the following steps:
if the power grid is not powered off, judging whether the power battery is charged or not according to the charge information in the state information;
if the charging is finished, the power supply and distribution device sends a work stopping instruction to the current conversion device through the power conversion control system;
and the current conversion device stops charging the power battery after the charging is finished according to the work stopping instruction.
Further, the method further comprises:
if the charging is not finished, the power supply and distribution device sends a work starting instruction to the current conversion device through the power conversion control system;
and the current conversion device starts to charge the power battery which is not charged according to the work starting instruction.
The implementation of the invention has the following beneficial effects:
1) the power battery is used for supplying power, the battery capacity is large, and the power station can be supported to continuously change the battery for multiple times.
2) The UPS mainly supplies power to the power swapping control device, so that the power swapping control device is prevented from being powered off at the moment of power grid outage, the capacity of the UPS can be small, and the cost and the size of the UPS are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a power swapping station protection system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a power swapping station protection method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of another power swapping station protection method according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of another power swapping station protection method according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of another power swapping station protection method according to an embodiment of the present invention;
the system comprises a power supply and distribution device 1, an uninterruptible power supply 2, a power switching control device 3, a power switching execution device 4, a current conversion device 5, a power battery storage device 6 and a transformer 7, wherein the power supply and distribution device is connected with the power supply and distribution device through the power supply and distribution control device;
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Fig. 1 is a schematic structural diagram of a power swapping station protection system provided in an embodiment of the present invention, and as shown in fig. 1, the present invention provides a power swapping station protection system, including: the power supply and distribution device 1, the uninterruptible power supply 2, the battery replacement control device 3, the battery replacement execution device 4, the current conversion device 5 and the power battery storage device 6;
the power supply and distribution device 1 is electrically connected with the uninterruptible power supply 2, the power exchange control device 3, the power exchange execution device 4 and the current conversion device 5 respectively; the power supply and distribution device 1 is used for providing electric energy for the battery replacement control device 3 and the battery replacement execution device 4;
the uninterruptible power supply 2 is also electrically connected with the power switching control device 3 and is used for providing electric energy for the power supply and distribution device 1 and the power switching control device 3 when the power grid loses power;
the power conversion control device 3 is respectively in communication connection with the power supply and distribution device 1, the power conversion execution device 4 and the current conversion device 5;
the power battery storage device 6 is electrically connected with the current conversion device 5, and the current conversion device 5 is used for converting the electric energy in the power battery storage device 6 into the electric energy used by the power supply and distribution device 1 when the power grid loses power.
Specifically, the power supply and distribution device 1 is used for performing power supply and distribution management on the power exchange control device 3 and the power exchange execution device 4; the uninterruptible power supply 2 is mainly used for supplying power to the power supply and distribution device 1, the power change control device 3 and the power change execution device 4 when the power grid is powered off; the battery replacement control device 3 is used for controlling the battery replacement execution device 4 to complete a battery replacement function and controlling the current conversion device 5 to charge and discharge; the battery swapping execution device 4 is used for receiving an instruction of the battery swapping control device 3 to complete a battery swapping action; the power battery storage device 6 is used for taking power from the power grid and charging and storing energy to the power battery through the current conversion device 5 when the power grid outage does not occur, and supplying energy to the power supply and distribution device 1, the power conversion control device 3 and the power conversion execution device 4 from the power battery when the power grid outage occurs; the current conversion device 5 is used for working in a charging or discharging state according to the instruction of the battery replacement control device 3;
it will be appreciated that the power battery within the power battery storage device 6 may be used to provide electrical power to the electric vehicle.
For example, when the power battery of the vehicle needs to be charged due to low electric quantity, the vehicle owner can place the power battery of the vehicle on the power battery storage device 6 for charging, and after the power battery is placed, the power battery with the charged electric quantity can be taken off from the power battery storage device 6 and placed on the vehicle.
The power station replacement protection system provided by the embodiment of the description can provide electric energy through the power battery which is charged in the power station and is not taken down by a user when the power grid is powered off, so that normal work of equipment of the power station replacement is ensured, the battery capacity of the uninterruptible power supply 2 is reduced, and the UPS cost and the size are reduced. The stability and the reliability of each electric device of the power station are improved.
On the basis of the above embodiment, in one embodiment of the present specification, the power battery storage device 6 includes: a first partition and a second partition;
the first partition is used for placing a power battery without faults; the second partition is used for placing a power battery with a fault.
On the basis of the above embodiments, in one embodiment of the present specification, the power battery includes: the energy storage unit and the battery management unit;
the energy storage unit is electrically connected with the current conversion device 5; the battery management unit is connected in communication with the current conversion device 5.
Specifically, the Battery Management unit (BMS) is a real-time monitoring System composed of electronic circuit devices, and effectively monitors Battery voltage, Battery current, Battery cluster insulation state, Battery SOC, Battery module and cell state (voltage, current, temperature, SOC, etc.), performs safety Management on Battery cluster charging and discharging processes, performs alarm and emergency protection processing on possible faults, performs safety and optimization control on operation of a Battery module and a Battery cluster, and ensures safe, reliable and stable operation of a Battery.
On the basis of the above embodiments, in an embodiment of the present specification, the current conversion device 5 is a bidirectional current conversion device 5, and is configured to convert ac power of a power grid into dc power of the energy storage unit when the power grid is powered on, and further configured to convert electric energy of the energy storage unit into ac power for the power distribution apparatus 1 when the power grid is powered off.
On the basis of the above embodiments, in an embodiment of the present specification, the operating voltage of the power supply and distribution apparatus 1 is 380V.
On the basis of the above embodiments, in an embodiment of the present specification, the method further includes: a transformer;
the high-voltage end of the transformer is used for being connected with the high voltage of a power grid, the low-voltage end of the transformer is connected with the power supply and distribution device 1, and the transformer is used for converting the high-voltage electricity of the power grid into the voltage grade corresponding to the power supply and distribution device 1.
Illustratively, the high-voltage end (10kV) of the transformer is connected with a power grid, and the low-voltage end (380V) of the transformer is connected with the power supply and distribution device 1. The transformer is used for converting the 10kV voltage of the power grid into the working voltage 380V of the power supply and distribution device 1.
On the other hand, fig. 2 is a schematic flow chart of a power swapping station protection method provided in an embodiment of the present invention, and as shown in fig. 2, the method provided in the present invention is applied to any one of the power swapping station protection systems, and the method includes:
s102, the power supply and distribution device 1 acquires the state information of each group of power batteries in the first partition through the current conversion device 5, wherein the state information comprises: fault information;
s104, the power supply and distribution device 1 judges whether each group of power batteries has faults or not according to the state information;
s106, if the power battery fails, sending address information in the failure information to a battery swapping execution device 4 through a battery swapping control device 3;
and S108, the power swapping execution device 4 moves the power battery with the fault to a second partition according to the address information in the fault information.
On the basis of the foregoing embodiment, in an embodiment of this specification, fig. 3 is a schematic flow diagram of another power swapping station protection method provided in the embodiment of the present invention, and as shown in fig. 3, the method further includes:
s202, if no power battery in the first partition fails, judging whether a power grid is powered off by the power supply and distribution device 1;
s204, if the power grid is powered off, an uninterruptible power supply 2 supplies power to the power supply and distribution device 1 instantly, and the power supply and distribution device 1 sends a discharging instruction to the current conversion device 5 through the power conversion control device 3;
and S206, the current conversion device 5 supplies power to the power supply and distribution device 1 by controlling the power battery of the first subarea according to the received discharge instruction until the power of the power grid is obtained or the power of the power battery of the first subarea is exhausted.
On the basis of the foregoing embodiment, in an embodiment of this specification, fig. 4 is a schematic flow chart of another power swapping station protection method provided in the embodiment of the present invention, and as shown in fig. 4, the state information includes: charge amount information;
the method further comprises the following steps:
s302, if the power grid is not powered off, judging whether the power battery is charged or not according to the charge information in the state information;
s304, if the charging is finished, the power supply and distribution device 1 sends a work stopping instruction to the current conversion device 5 through the power exchange control system;
and S306, the current conversion device 5 stops charging the power battery after charging according to the work stopping instruction.
On the basis of the foregoing embodiment, in an embodiment of this specification, fig. 5 is a schematic flow diagram of another power swapping station protection method provided in the embodiment of the present invention, as shown in fig. 5, where the method further includes:
s402, if the charging is not finished, the power supply and distribution device 1 sends a work starting instruction to the current conversion device 5 through the power conversion control system;
and S404, the current conversion device 5 starts to charge the power battery which is not charged according to the work starting instruction.
Specifically, the power supply and distribution device 1 supplies power to the UPS, the power change control device 3, the power change execution device 4 and the current conversion device 5, and the UPS supplies power to the power change control device 3 when the power grid is interrupted. The power supply and distribution device 1 is communicated with the power exchange control device 3, and the power supply and distribution device 1 sends the power supply state of the current power grid to the power exchange control device 3; the battery replacement control device 3 is communicated with the battery replacement execution device 4, the battery replacement control device 3 sends a control instruction to the battery replacement execution device 4, and the battery replacement execution device 4 feeds back a battery replacement state to the battery replacement control device 3; the battery replacement control device 3 is communicated with the current conversion device 5, the battery replacement control device 3 sends a charging and discharging instruction to the current conversion device 5, and the current conversion device 5 feeds back a charging and discharging state to the battery replacement control device 3; the current conversion device 5 communicates with the power battery to perform charge and discharge information interaction.
The power supply and distribution device 1 is used for judging whether power grid outage occurs or not and sending the judged state to the power conversion control device 3 in real time. The battery replacement control device 3 acquires the state of the power battery through the current conversion device 5. When the power grid power failure does not occur, the battery replacement control device 3 judges whether the power battery is fully charged, if not, the battery replacement control device 3 controls the current conversion device 5 to charge the power battery, and if the power battery is fully charged, the charging is stopped. When power failure occurs in the power grid, the UPS automatically switches to supply power to the power conversion control device 3, so that the power conversion control device 3 cannot be powered off, the power conversion control device 3 receives a power failure state fed back by the power supply and distribution device 1, and the power conversion control device 3 controls the current conversion device 5 to enable the power battery to discharge to perform inversion and output alternating current to supply power to the UPS, the power conversion control device 3 and the power conversion execution device 4 through the power supply and distribution device 1. In order to ensure that the power battery discharges without fault when the power grid is powered off, the battery replacement control device 3 judges the fault state of the power battery, and if the power battery has fault, the battery replacement control device 3 controls the battery replacement execution device 4 to replace the power battery with the power battery without fault.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.
While embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications and variations may be made therein by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A power swapping station protection system, comprising: the power supply and distribution device (1), the uninterruptible power supply (2), the battery replacement control device (3), the battery replacement execution device (4), the current conversion device (5) and the power battery storage device (6);
the power supply and distribution device (1) is electrically connected with the uninterruptible power supply (2), the battery replacement control device (3), the battery replacement execution device (4) and the current conversion device (5) respectively; the power supply and distribution device (1) is used for providing electric energy for the battery replacement control device (3) and the battery replacement execution device (4);
the uninterruptible power supply (2) is also electrically connected with the power switching control device (3) and is used for providing electric energy for the power supply and distribution device (1) and the power switching control device (3) when the power grid loses power;
the power switching control device (3) is respectively in communication connection with the power supply and distribution device (1), the power switching execution device (4) and the current conversion device (5);
the power battery storage device (6) is electrically connected with the current conversion device (5), and the current conversion device (5) is used for converting electric energy in the power battery storage device (6) into electric energy used by the power distribution device (1) when the power grid loses power.
2. The charging station protection system according to claim 1, characterized in that the power battery storage device (6) comprises: a first partition and a second partition;
the first partition is used for placing a power battery without faults; the second partition is used for placing a power battery with a fault.
3. The charging station protection system as recited in claim 2, wherein the power battery comprises: the energy storage unit and the battery management unit;
the energy storage unit is electrically connected with the current conversion device (5); the battery management unit is connected with the current conversion device (5) in a communication mode.
4. The charging station protection system according to claim 3, wherein the current conversion device (5) is a bidirectional current conversion device (5) for converting the alternating current of the power grid into the direct current of the energy storage unit when the power grid is powered on, and for converting the electric energy of the energy storage unit into the alternating current for the power distribution device (1) when the power grid is powered off.
5. The charging station protection system as recited in claim 1, further comprising: a transformer (7);
the high-voltage end of the transformer (7) is used for being connected with the high voltage of a power grid, the low-voltage end of the transformer (7) is connected with the power supply and distribution device (1), and the transformer (7) is used for converting the high voltage of the power grid into the voltage grade corresponding to the power supply and distribution device (1).
6. The power station changing protection system as claimed in claim 1, wherein the working voltage of the power supply and distribution device (1) is 380V.
7. A power swapping station protection method is applied to the power swapping station protection system of any one of claims 1-6, and the method comprises the following steps:
the power supply and distribution device (1) acquires the state information of each group of power batteries in the first partition through the current conversion device (5), wherein the state information comprises: fault information;
the power supply and distribution device (1) judges whether each group of power batteries has faults or not according to the state information;
if the power battery fails, sending address information in the failure information to a battery swapping execution device (4) through a battery swapping control device (3);
and the battery swapping execution device (4) moves the power battery with the fault to a second partition according to the address information in the fault information.
8. The power swapping station protection method of claim 7, further comprising:
if the power batteries in the first partition do not have faults, the power supply and distribution device (1) judges whether a power grid is powered off;
if the power grid is powered off, an uninterruptible power supply (2) supplies power to the power supply and distribution device (1) instantly, and the power supply and distribution device (1) sends a discharging instruction to the current conversion device (5) through the power change control device (3);
and the current conversion device (5) supplies power to the power supply and distribution device (1) by controlling the power battery of the first subarea according to the received discharge instruction until the power of the power grid is obtained or the power of the power battery of the first subarea is exhausted.
9. The power swapping station protection method of claim 8, wherein the state information comprises: charge amount information;
the method further comprises the following steps:
if the power grid is not powered off, judging whether the power battery is charged or not according to the charge information in the state information;
if the charging is finished, the power supply and distribution device (1) sends a work stopping instruction to the current conversion device (5) through the power conversion control system;
and the current conversion device (5) stops charging the power battery after the charging according to the work stopping instruction.
10. The charging station protection method according to claim 9,
the method further comprises the following steps:
if the charging is not finished, the power supply and distribution device (1) sends a work starting instruction to the current conversion device (5) through the power conversion control system;
and the current conversion device (5) starts to charge the power battery with incomplete charging according to the work starting instruction.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023125511A1 (en) * | 2021-12-30 | 2023-07-06 | 奥动新能源汽车科技有限公司 | Power supply management system, battery swapping station and power supply management method and apparatus therefor |
| CN116599203A (en) * | 2023-07-07 | 2023-08-15 | 四川智锂智慧能源科技有限公司 | Power exchange station and uninterrupted power supply method thereof |
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| CN116599203B (en) * | 2023-07-07 | 2024-03-22 | 四川智锂智慧能源科技有限公司 | Power exchange station and uninterrupted power supply method thereof |
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| CN111969708B (en) | 2022-07-19 |
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