CN212392711U - Fuel cell standby power supply control system - Google Patents
Fuel cell standby power supply control system Download PDFInfo
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- CN212392711U CN212392711U CN202020590812.7U CN202020590812U CN212392711U CN 212392711 U CN212392711 U CN 212392711U CN 202020590812 U CN202020590812 U CN 202020590812U CN 212392711 U CN212392711 U CN 212392711U
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Abstract
The utility model provides a fuel cell stand-by power supply control system, including alternating current power supply, fuel cell stand-by power supply and direct current load, the difference exclusive connection between alternating current power supply, fuel cell stand-by power supply and direct current load three, fuel cell stand-by power supply includes starting module and fuel cell, starting module with be provided with the circuit breaker between the fuel cell, alternating current power supply respectively with starting module, fuel cell exclusive connection. A capacity starting battery module is added in the fuel cell standby power supply system, and the module has small capacity, large current and low cost and can be used for a short-time main control board and a load; the circuit breaker is added between the starting module and the fuel cell main control board, so that the power supply relation between the fuel cell and the starting module can be physically cut off, the control is simple, and the logic is simple.
Description
Technical Field
The utility model relates to a fuel cell technical field, concretely relates to fuel cell stand-by power supply control system.
Background
Communication base stations, iron towers and other equipment with extremely high requirements on electric power reliability are all provided with multiple power supplies, usually alternating current commercial power is used as a main power supply, and a diesel engine and a battery pack are required to be provided as standby power supplies. When the commercial power is cut off, the standby power supply at the user side is started to supply power to the load so as to ensure that the load does not stop working. However, the diesel engine, the lithium battery or the storage battery have the problem of environmental pollution. Especially, the storage battery has large volume, short service life and overlong maintenance cost period, and cannot be used as the optimal selection of the standby power supply. Compared with a storage battery, the lithium battery has slightly optimized performance, but the common problems of the chemical batteries still exist, and the lithium battery is used for replacing the storage battery, but the treatment is not the cause. Therefore, the fuel cell is used as a standby power supply to become a new development trend, and the fuel cell standby power supply is more suitable for being used as the standby power supply due to the advantages of zero pollution, high power density, low maintenance cost, long service life and the like.
In the prior art, for example, chinese patent application No. CN201610239231.7 discloses a backup power supply device for supplying a fuel cell with commercial power, and chinese patent application No. CN201010531969.3 discloses a control system and a control method for the backup power supply of the fuel cell. The two patents are focused on the fuel cell operation system and control, the starting needs to depend on a lithium battery or a storage battery of a base station for power supply, but no commercial power, switching logic of the lithium battery and the fuel cell are written, and no corresponding description is provided for the working state of the lithium battery after the fuel cell is started. There is no priority for the operation of lithium battery and fuel battery, the fuel battery is not operated independently, depends on the battery pack of the base station, and can work with the lithium battery. The design can cause resource waste, the fuel cell is not fully used, pollution still exists, the working efficiency is not obviously changed, and the resource waste is caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a not enough to prior art, the utility model provides a fuel cell stand-by power supply control system, through the starting module who adds the small capacity, add direct current normally closed circuit breaker between starting module and fuel cell main control board, can physics cut off the power supply relation between fuel cell and the starting module, can not rely on the group battery of base station from the area, can be suitable for newly-built base station completely, fuel cell stand-by power supply source is strong adaptability simultaneously, realizes self-sufficiency after the start.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a fuel cell stand-by power supply control system, includes AC power supply, fuel cell stand-by power supply and direct current load, connect alone respectively between AC power supply, fuel cell stand-by power supply and direct current load three, fuel cell stand-by power supply includes starting module and fuel cell, starting module with be provided with the circuit breaker between the fuel cell, AC power supply is connected alone with starting module, fuel cell respectively. A capacity starting battery module is added in the fuel cell standby power supply system, and the module has small capacity, large current and low cost and can be used for a short-time main control board and a load; the circuit breaker is added between the starting module and the fuel cell main control board, so that the power supply relation between the fuel cell and the starting module can be physically cut off, the control is simple, and the logic is simple.
Further, the fuel cell comprises a main control board, fuel cell accessories, an electric pile and a power converter, the main control board is connected with the starting module through the circuit breaker, the main control board, the fuel cell accessories, the electric pile and the power converter are sequentially connected, and the power converter is connected to a direct current load. The power supply relation between the main control board and the starting module is controlled through the circuit breaker, the technical bottleneck that the power supply switching is realized by collecting voltage through the main control board in the prior art is broken through, simple and effective switching control is realized, the starting module is controlled to discharge through closing the circuit breaker to start the main control board, then the fuel cell accessories are started, and the electric pile discharges to output a corresponding voltage value through the power converter to supply power for the direct-current load.
Furthermore, an alternating current relay is connected and arranged between the alternating current power supply and the main control board. The connection between the main control board and the alternating current power supply can be guaranteed by arranging the alternating current relay, and meanwhile, the main control board can conveniently acquire the information quantity of the alternating current relay to judge the power supply condition of the alternating current power supply.
Further, the starting module comprises a power adapter and a lithium battery, the lithium battery is connected to the alternating current power supply through the power adapter, and the lithium battery is connected to the fuel cell through a circuit breaker. The safety of the alternating-current power supply when the lithium battery is charged can be guaranteed through the power adapter, and the lithium battery can provide enough electric quantity for the main control board to enable the main control board to be started.
Further, an AC/DC converter is provided between the AC power source and the DC load. The AC power of the AC power source is converted to DC power by an AC/DC converter that can be used by a DC load.
Further, the lithium battery is specifically a lithium iron phosphate battery with 48V capacity of 3 Ah. The lithium iron phosphate battery with the 48V capacity of 3Ah can effectively save cost, can ensure enough power supply to start the main control board, and is matched with the circuit breaker to be used as an optimal cost-saving scheme.
The utility model provides a pair of fuel cell stand-by power supply control system's beneficial effect lies in: a small-capacity lithium battery is added in a fuel cell standby power supply system to serve as a starting module, and the fuel cell standby power supply can independently operate independently without depending on the original power supply of a base station and is two independent systems; in addition, the circuit breaker is added between the main control panel of the fuel cell and the lithium battery starting module, so that the utilization rate of the lithium battery can be obviously reduced, the maintenance period and the cost are greatly reduced, the fuel cell is fully utilized, the power density is improved, and the environmental pollution is reduced.
Drawings
Fig. 1 is a schematic view of a control system of the present invention;
fig. 2 is a schematic flow chart of the control method of the present invention.
In the figure: 1. a fuel cell; 2. a starting module; 3. a direct current normally closed circuit breaker; 4. an AC relay; 5. an AC/DC converter; 6. a direct current load; 7. an alternating current power supply; 101. a main control board; 102. a fuel cell fitting; 103. a galvanic pile; 104. a DC/DC power converter; 201. a power adapter; 202. a lithium battery.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive step are within the scope of the present invention.
Example 1: a fuel cell backup power control system.
As shown in fig. 1, a fuel cell backup power control system includes an ac power supply 7, a fuel cell backup power supply, and a dc load 6, where the ac power supply 7, the fuel cell backup power supply, and the dc load 6 are separately connected, the fuel cell backup power supply includes a starting module 2 and a fuel cell 1, a circuit breaker is disposed between the starting module 2 and the fuel cell 1, and the ac power supply 7 is separately connected to the starting module 2 and the fuel cell 1;
the fuel cell 1 comprises a main control board 101, a fuel cell accessory 102, a galvanic pile 103 and a DC/DC power converter 104, wherein the main control board 101 is connected with the starting module 2 through the circuit breaker, the main control board 101, the fuel cell accessory 102, the galvanic pile 103 and the DC/DC power converter 104 are sequentially connected, and the DC/DC power converter 104 is connected to a direct current load 6;
an alternating current relay 4 is connected and arranged between the alternating current power supply 7 and the main control board 101; the starting module 2 comprises a power adapter 201 and a lithium battery 202, wherein the lithium battery 202 is connected to the alternating current power supply 7 through the power adapter 201, and the lithium battery 202 is connected to the fuel cell 1 through a circuit breaker; an AC/DC converter 5 is also arranged between the AC power supply 7 and the DC load 6; the lithium battery 202 is specifically a lithium iron phosphate battery with 48V capacity of 3 Ah; the breaker is specifically a direct current normally closed breaker 3.
In this embodiment, the ac relay 4 is configured to detect a power supply state of an ac bus, and the main control board 101 collects a switching signal amount, where ac power is a high level signal and no power is a low level signal;
a lithium ion battery 202 with a power adapter 201, which is a solution to save cost, a lithium iron phosphate battery with a capacity of 3Ah and 48V is selected as the starting module 2 of the fuel cell 1.
And the direct-current normally closed circuit breaker 3 is used for sensing whether the direct-current bus is electrified or not, the switch is disconnected when the direct-current bus is electrified, and the lithium battery 202 is in a floating charging state and is only charged but not discharged. When the bus voltage is 0, the direct-current normally-closed circuit breaker 3 is closed, and the lithium battery 202 supplies power to the main empty board 101.
And the main control board 101 is used for supplying power to the fuel cell accessories 102, collecting signals such as voltage, current, temperature and concentration, analyzing and processing the collected signals, and sending an action command. In the standby state, the main control board 101 is powered by the ac power supply 7. The fuel cell assembly 102, which includes all the fuel cells 1 except the stack 103, includes functional modules for hydrogen supply and collection. The fuel cell system comprises a galvanic pile 103, a fuel cell standby power supply core part and a main power supply module for converting hydrogen into voltage. The open-circuit voltage of the fuel cell 1 of the DC/DC power converter 104 is much higher than the rated voltage, and if the open-circuit is a stack structure, the output voltage of the stack 103 cannot be stably output, so the DC/DC power converter 104 needs to be connected in series on the output voltage side of the stack 103, and the main function is constant voltage, constant current and constant power.
Starting: the fuel cell standby power supply is to trigger the closing of the direct current normally closed circuit breaker 3 by the following two signals in a direct current normally closed circuit breaker 3 closing and opening working mode: (1) the original base station is provided with a large storage battery or lithium battery energy storage device, and the lithium battery is switched into the direct current bus to supply power when the alternating current is cut off. The dc bus voltage will gradually decrease with discharge time, in which case the fuel cell backup power supply will supply power as a secondary alternative. At this time, the main control board 101 collects the discharge voltage of the lithium battery pack, and when the discharge voltage is reduced to 45V, the direct-current normally-closed circuit breaker 3 is closed, and the fuel cell 1 is started.
(2) When the base station is newly built, no self-provided large storage battery or lithium battery energy storage equipment exists, alternating current is powered off, a 48V direct current bus is rapidly powered off to 0, the direct current normally closed circuit breaker 3 is closed at the moment, and the fuel cell 1 is started.
Operation: after the direct current normally closed circuit breaker 3 is closed, the working process is as follows:
the lithium battery 202 of the starting module 2 in the fuel cell standby power supply supplies power to the main control board 101, the main control board 101 is changed from a standby state to a starting state, and starts to send instructions to all fuel cell accessories 102, so that all accessories reach a working state, and hydrogen and oxygen are input to the electric pile 103 to react at a certain flow pressure in the process. During a predetermined fuel cell start-up time (depending on the actual operating condition and stack performance, the shorter the start-up time, the better) the stack 103 will output a voltage, and since the open circuit voltage of the stack 103 is higher than the rated operating voltage, the DC/DC power converter 104 is added for voltage reduction and stabilization. The output of the DC/DC power converter 104 will now output a voltage. The voltage detection device feeds back a signal to the main control panel 101, the voltage is greater than 0V, the 48V direct current bus is electrified, the 48V is recovered, the direct current normally closed circuit breaker 3 is disconnected, the lithium battery 202 stops supplying power to the main control panel 101, and the fuel cell 1 provides all electric energy required by the main control panel 101 and a load. When the detected voltage =0V, the dc normally-closed circuit breaker 3 is closed, and the main control board 101 power supply is continuously supplied by the lithium battery 202 until the fuel cell 1 has an output voltage.
Closing: when the power supply of the alternating current power supply 7 is detected, the alternating current relay 4 provides a high level signal to the main control board 101, at this time, the main control board 101 stops sending the working instruction, the standby mode is recovered, and the alternating current power supply 7 provides direct current 48V power supply through the AC/DC converter 5.
Example 2: a control method for a fuel cell standby power supply.
As shown in fig. 2, a method for controlling a fuel cell backup power supply, using the fuel cell backup power supply control system according to embodiment 1, includes the following steps:
the current power supply condition is judged to be a power supply state or a non-power state by detecting the voltage of the alternating current bus, different power supply modes are selected according to the power supply condition, when the system is in the power supply state, the alternating current power supply 7 is controlled to supply power for the direct current load 6, the starting module 2 is charged through the alternating current power supply 7, the alternating current relay 4 is closed, and the main control board 101 detects the information quantity of the switch. When power is detected, the current system is normal, the normal power supply of the alternating current power supply 7 is maintained, and meanwhile, the starting module 2 is charged for starting power supply of a subsequent standby power supply.
When the system is in a non-electric state, the alternating current relay 4 is disconnected, and then the voltage of the direct current bus is detected to judge whether a standby power supply except the fuel cell standby power supply exists, specifically: detecting the voltage of the direct current bus to obtain a voltage value, and judging that no other standby power supply exists when the voltage value is rapidly smaller than 45V or equal to 0; the direct current normally closed circuit breaker 3 is closed, the lithium battery 202 discharges, the main control board 101 starts, the fuel cell accessory 102 starts, the fuel cell starts, and voltage is output through the DC/DC power converter 104.
When the voltage value is larger than the set value, judging that other standby power supplies exist, disconnecting the direct-current normally-closed circuit breaker 3, and enabling the lithium battery to float on line for a long time.
Meanwhile, the main control board 101 of the fuel cell 1 collects the signal quantity of the alternating current relay 4, and if a high level signal is collected, the power-on state is judged; and if the low level signal is acquired, judging the power-off state. And after the high-level signal is acquired, the alternating current relay 4 is closed, the direct current normally closed circuit breaker 3 is disconnected, and the power supply of the fuel cell 1 is switched to the alternating current power supply 7 for power supply.
The above description is a preferred embodiment of the present invention, but the present invention should not be limited to the disclosure of the embodiment and the accompanying drawings, and therefore, all equivalents and modifications that can be accomplished without departing from the spirit of the present invention are within the protection scope of the present invention.
Claims (6)
1. The utility model provides a fuel cell stand-by power supply control system, its characterized in that, includes alternating current power supply, fuel cell stand-by power supply and direct current load, separately connect respectively between alternating current power supply, fuel cell stand-by power supply and direct current load three, fuel cell stand-by power supply includes starting module and fuel cell, starting module with be provided with the circuit breaker between the fuel cell, alternating current power supply respectively with starting module, fuel cell separate connection.
2. The fuel cell backup power control system according to claim 1, wherein the fuel cell includes a main control board, a fuel cell assembly, a stack, and a power converter, the main control board is connected to the start module through the circuit breaker, the main control board, the fuel cell assembly, the stack, and the power converter are connected in sequence, and the power converter is connected to a dc load.
3. The fuel cell backup power control system according to claim 2, wherein an ac relay is connected and provided between the ac power source and the main control board.
4. The fuel cell backup power control system according to claim 1, wherein said start-up module includes a power adapter and a lithium battery, said lithium battery being connected to said ac power source through said power adapter, said lithium battery being connected to said fuel cell through a circuit breaker.
5. The fuel cell backup power control system according to claim 1, wherein an AC/DC converter is further provided between said alternating current power source and said direct current load.
6. The fuel cell backup power control system according to claim 4, wherein said lithium battery is in particular a 48V capacity 3Ah lithium iron phosphate battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020590812.7U CN212392711U (en) | 2020-04-20 | 2020-04-20 | Fuel cell standby power supply control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020590812.7U CN212392711U (en) | 2020-04-20 | 2020-04-20 | Fuel cell standby power supply control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212392711U true CN212392711U (en) | 2021-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020590812.7U Active CN212392711U (en) | 2020-04-20 | 2020-04-20 | Fuel cell standby power supply control system |
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| CN (1) | CN212392711U (en) |
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- 2020-04-20 CN CN202020590812.7U patent/CN212392711U/en active Active
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