CN218867921U - Fuel cell auxiliary system and fuel cell system - Google Patents
Fuel cell auxiliary system and fuel cell system Download PDFInfo
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- CN218867921U CN218867921U CN202223396401.2U CN202223396401U CN218867921U CN 218867921 U CN218867921 U CN 218867921U CN 202223396401 U CN202223396401 U CN 202223396401U CN 218867921 U CN218867921 U CN 218867921U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The utility model discloses a fuel cell auxiliary system and fuel cell system. The fuel cell auxiliary system comprises an auxiliary load, a direct current bus, an external power supply branch and an internal power supply branch, wherein the direct current bus is connected with the auxiliary load and used for supplying electric energy to the auxiliary load; the external power supply branch comprises a rectifier, and alternating current of an external power grid is rectified by the rectifier and then is provided to a direct current bus; the electric energy generated by the operation of the fuel cell system is transmitted to the direct current bus through the internal power supply branch; when the external power supply branch circuit supplies power normally, the auxiliary load acquires the electric energy of an external power grid from the direct current bus, and the electric energy generated by the operation of the fuel cell system is transmitted to the power supply output port through the internal power supply branch circuit and the direct current bus; when the external power supply branch circuit is abnormal in power supply, the electric energy generated by the operation of the fuel cell is supplied to the auxiliary load through the internal power supply branch circuit and the direct current bus part so as to supply the auxiliary load to operate. The utility model discloses the scheme can reduce fuel cell system's volume and cost to and reduce the routine maintenance work.
Description
Technical Field
The utility model relates to a fuel cell technical field especially relates to a fuel cell auxiliary system and fuel cell system.
Background
A fuel cell auxiliary system (BOP) is an indispensable system for cooperating with a stack to achieve stable operation of the stack, and the BOP includes various devices for driving operation of liquid, gas, and the like. In a hydrogen fuel cell stationary power generation system, the power supply of the BOPs is usually supported by the external power grid, and when the external power grid has short undervoltage or power supply interruption event, the BOP cannot operate normally, which is called as a low voltage ride through event. In order to maintain the normal operation of the fuel cell power generation system during the low voltage ride through event, it is necessary to provide the BOP with a necessary backup auxiliary power source so that the BOP can stably operate during the low voltage ride through event.
In past industrial solutions, this functional protection was typically accomplished using static transfer switching devices. In other words, during the operation of the fuel cell power generation system, the power supply state of the power grid is monitored in real time, and when the power supply state of the power grid is monitored to be under-voltage or interrupted, the device powered by the power grid is switched to be powered by the backup auxiliary power supply at the fastest speed (millisecond level) by virtue of the static selector switch. However, the static switch needs additional energy storage backup power supply to support the switching, and the energy storage backup power supply needs to be an online energy storage device in an electrochemical form, such as a capacitor, due to the high requirement on the synchronization during the switching process. However, both static transfer switches and electrochemical energy storage devices take up additional volume and increase manufacturing and at the same time bring additional routine maintenance requirements.
Based on this, there is a need to provide a new technical solution to overcome the shortcomings of the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome prior art's defect, provided a fuel cell auxiliary system and fuel cell system, can reduce fuel cell system's volume and cost to and reduce the routine maintenance work.
The utility model discloses a following technical scheme realizes: a fuel cell auxiliary system for cooperating with a stack to effect power generation from operation of a fuel cell system, the fuel cell auxiliary system including an auxiliary load, wherein the fuel cell auxiliary system further comprises: a DC bus connected to the auxiliary load for supplying electric power to the auxiliary load; the external power supply branch is connected with the direct current bus and comprises a rectifier, and alternating current of an external power grid is rectified by the rectifier and then is provided to the direct current bus; the internal power supply branch is connected with the direct current bus, and electric energy generated by the operation of the fuel cell system is transmitted to the direct current bus through the internal power supply branch; when the power supply of the external power supply branch is normal, the auxiliary load obtains the electric energy of the external power grid from the direct current bus to supply the external power grid to operate, and the electric energy generated by the operation of the fuel cell system is transmitted to a power supply output port through the internal power supply branch and the direct current bus; when the power supply of the external power supply branch circuit is abnormal, the electric energy generated by the operation of the fuel cell is supplied to the auxiliary load through the internal power supply branch circuit and the direct current bus part so as to supply the auxiliary load to operate.
As a further improved technical solution of the present invention, the dc bus includes a high voltage dc bus or a high voltage dc bus.
As the utility model discloses please further improved technical scheme, the external power supply branch road includes the follow the converter of direct current bus electricity-taking, the converter is used for following the direct current that direct current bus acquireed is the alternating current.
As the technical solution of the present invention, the auxiliary load includes an ac power supply load driven by the ac power after the frequency conversion of the frequency converter.
As the technical solution of the present invention, a dc line is provided in the frequency converter, and the dc line is directly connected to the dc bus.
As the utility model discloses please further improved technical scheme, brake resistance has in the converter, direct current bus is connected to the brake resistance of converter.
As the utility model discloses please further improved technical scheme, the alternating current power supply load includes motor class equipment.
As a further improved technical solution of the present invention, the rectifier is an isolated synchronous rectifier.
As a further improved technical solution of the present invention, the auxiliary load includes a dc power supply load driven by a dc power.
The utility model discloses still realize through following technical scheme: a fuel cell system comprising a stack and a voltage boosting device, and a fuel cell auxiliary system as described in any of the above claims.
The utility model provides a fuel cell auxiliary system, including direct current bus, external power supply branch road and interior power supply branch road, the external power supply branch road includes the rectifier, and the alternating current of external electric wire netting is provided to direct current bus through the external power supply branch road, and the electric energy that the operation of fuel cell system produced is provided to direct current bus to the interior power supply branch road; when the power supply of the external power supply branch circuit is normal, the auxiliary load obtains the electric energy of the external power grid from the direct current bus to operate the auxiliary load, and when the power supply of the external power supply branch circuit is abnormal, the electric energy generated by the operation of the fuel cell is partially supplied to the auxiliary load through the internal power supply branch circuit and the direct current bus to operate the auxiliary load, so that devices such as a static selector switch and a backup auxiliary power supply can be omitted, the volume and the cost of a fuel cell system can be reduced, and the daily maintenance work can be reduced.
Drawings
Fig. 1 is a system schematic diagram of a first embodiment of the fuel cell auxiliary system of the present invention.
Fig. 2 is a schematic system diagram of a second embodiment of the fuel cell auxiliary system of the present invention.
The reference numbers are as follows: 1-a direct current bus; 10-external power supply branch; 20-internal power supply branch; 2-an external power grid; 3-a rectifier; 31-a frequency converter; 4-electric pile and booster; 5-a dc supply load; 51-ac supply load; 6-supply output port.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The technical solution in the embodiment of the present invention is clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art without creative work belong to the scope of the present invention based on the embodiments of the present invention.
The utility model discloses a fuel cell auxiliary system and have this auxiliary system's fuel cell system. The fuel cell auxiliary system is called Balance of Plant (BOP for short) in English, and is a system used for being matched with a galvanic pile to realize the stable operation of the galvanic pile so as to generate electric energy. In a specific fuel cell system, the fuel cell auxiliary system may be, for example, a hydrogen intake system, an air intake system, a water heat management system, etc.; the fuel cell auxiliary system is used for realizing the operation of gas, liquid and the like, and for realizing the management of temperature, humidity and the like.
As shown in fig. 1 and 2, the fuel cell auxiliary system includes an auxiliary load, a dc bus 1, an external power supply branch 10, and an internal power supply branch 20. The auxiliary load can be a direct current power supply load 5 driven by direct current power supply, such as an electromagnetic valve, a temperature measuring sensor, a pressure sensor and the like; or may be an ac power supply load 51, such as a motor, a water pump, etc., driven by ac power. The dc bus 1 is connected to the auxiliary load to provide electrical energy to the auxiliary load for the auxiliary load to operate. The external power supply branch 10 is connected to the dc bus 1, and the external power supply branch 10 is configured to provide electric energy to the dc bus 1. In this embodiment, the external power supply branch 10 is configured to rectify and provide the alternating current of the external power grid 2 to the direct current bus 1. Specifically, the external power supply branch 10 includes a rectifier 3, and the ac power of the external power grid 2 is rectified by the rectifier 3 and then provided to the dc bus 1. The internal power supply branch 20 is connected to the dc bus 1, and the electric energy generated by the operation of the fuel cell system is transmitted to the dc bus 1 through the internal power supply branch 20.
Because the auxiliary load obtains electric energy from the dc bus 1 to operate, and the electric energy of the external power supply branch 10 and the internal power supply branch 20 is provided to the dc bus 1, the electric energy obtained by the auxiliary load from the dc bus 1 may be provided by the external power supply branch 10, that is, obtained from the external power grid 2; it can also be obtained from an internal power supply branch 20, i.e. from the electrical energy generated in said stack and step-up device 4. In the present embodiment, when the power supply state of the external power supply branch 10 is normal, the auxiliary load obtains the electric energy of the external power grid 2 from the dc bus 1 to supply the electric energy to the external power grid 2 for operation, and the electric energy generated by the operation of the fuel cell system is transmitted to the power supply output port 6 through the internal power supply branch 21 and the dc bus 1; when the external power supply branch 10 is in abnormal power supply, the electric energy generated by the operation of the fuel cell is supplied to the auxiliary load through the internal power supply branch 21 and a part of the dc bus 1 to supply the auxiliary load for operation, and the other part is transmitted to the power supply output port 6.
The power supply output port 6 may be a port connected to a power grid, or may be a port connected to a motor or other power consuming loads. In an embodiment, the dc bus 1 further includes a bus device, and the electric energy generated by the fuel cell system is output to the outside through the bus device.
The utility model provides a fuel cell auxiliary system, when the power supply of external power supply branch road 10 is normal, auxiliary load follows direct current bus 1 acquires the electric energy of outside electric wire netting 2 is in order to supply its operation when the power supply of external power supply branch road 10 is unusual, the electric energy that fuel cell operation produced warp inside power supply branch road 20 with direct current bus 1 part provides auxiliary load is with the confession auxiliary load operation to can omit devices such as static change over switch and reserve auxiliary power source that set up in the traditional art, can reduce fuel cell system's volume and cost to and reduce the routine maintenance work.
Further, as shown in fig. 1 and fig. 2, the dc bus 1 includes a high-voltage dc bus or a high-voltage dc bus bar. The utility model discloses in the technical scheme of the application, female understanding of arranging of high voltage direct current generating line or high voltage direct current is the galvanic pile that can bear fuel cell and the electric energy that the device 4 produced that steps up and the generating line or the female row that can bear the electric energy of outside electric wire netting 2 after the rectification. In this embodiment, the external power grid 2 is, for example, 380V three-phase power, and the dc bus 1 needs to be sufficient to withstand the current flowing after the 380V three-phase power is rectified into high-voltage dc power by the rectifier 3. The rectifier 3 can convert the three-phase power supply of the external power grid 2 into high-voltage direct-current power supply, and power supply output is carried out along with the power consumption of the auxiliary load in a constant-voltage constant-power working mode. In this embodiment, the rectifier 3 is a synchronous rectifier, preferably an isolated synchronous rectifier, and has a better electrical safety performance. It should be noted that the rectifier 3 is understood to be a device or a combination of devices for converting alternating current to direct current, including an ac-dc converter with equivalent power output.
Fig. 1 is a schematic system diagram of a first embodiment of the fuel cell auxiliary system of the present invention, and fig. 2 is a schematic system diagram of a second embodiment of the fuel cell auxiliary system of the present invention. In the first embodiment shown in fig. 1, the auxiliary load only includes the dc power supply load 5, which directly takes power from the dc bus 1 for operation, or takes power from the dc bus 1 for operation through the rectifier 3; the circuit is simpler. In the second embodiment shown in fig. 2, the auxiliary loads include a dc power supply load 5 and an ac power supply load 51, and therefore, the external power supply branch 10 further includes a frequency converter 31 for taking power from the dc bus 1, where the frequency converter 31 is configured to convert the dc power obtained from the dc bus 1 into ac power for the ac power supply load 51 to take power for operation.
Referring to fig. 2, in the present embodiment, the auxiliary load includes a dc power supply load 5 driven by dc power and an ac power supply load 51 driven by ac power after frequency conversion by the frequency converter 31. The ac power supply load includes 51 motor type devices. It is understood that, in a specific connection manner, the frequency converter 31 may be directly connected to the dc bus 1, or may be connected to the dc bus 1 through the rectifier 3. Traditional converter is used for changing the alternating current of input into the alternating current output of different frequencies the utility model discloses in the technical scheme of application, what converter 31 was input is the direct current, consequently the utility model discloses the application changes to some extent to converter 31's input connection structure. In the present embodiment, the frequency converter 31 has a dc line therein, and the dc line is directly connected to the dc bus 1. Specifically, the frequency converter 31 has a brake resistor therein, and the dc bus 1 is connected to the brake resistor of the frequency converter 31. The utility model discloses the application has made the change on the input connection with converter 31, and other structures of converter 31 can refer to current converter setting, can understand, inner structure and theory of operation in the converter are the prior art in this field, and it is no longer repeated here.
The utility model discloses a fuel cell system, it includes the galvanic pile and steps up device 4 to and as above fuel cell auxiliary system.
The utility model discloses the application provides a fuel cell system's use scene is explained below: when the external power grid 2 supplies power normally, the external power grid 2 compensates the consumption of the auxiliary load on the direct current bus 1 through the synchronous rectifier; when the external grid 2 is abnormal, such as a low voltage ride through event, the auxiliary load continues to operate uninterrupted by the energy generated by the fuel cell system itself.
During the starting phase of the fuel cell system, the external power grid 2 supplies power, that is, the rectifier 3 obtains energy from the external power grid 2 and raises the voltage of the dc bus 1 to support the starting of the fuel cell auxiliary system; when the fuel cell system normally generates electricity, the energy of the direct current bus 1 is provided by the fuel cell and is output to the external network through the power supply output port 6; at the same time, the rectifier 3 will still supply the dc bus 1 with the power consumed by the auxiliary load, so as to counteract the energy consumption of the auxiliary load when it is operating.
When a low-voltage ride-through event occurs in the external power grid 2, the power supply of the rectifier 3 is stopped for a short time, a part of electric energy of the direct current bus 1 can be used for supporting the power supply of the auxiliary load so as to keep the fuel cell system to normally operate and generate power, and at the moment, the net generated power can be slightly reduced; when the external power grid 2 returns to normal, the rectifier 3 returns to work, and the generated power is completely recovered.
According to the above description of the specific embodiment, the utility model provides a fuel cell auxiliary system, when the power supply of external power supply branch road 10 is normal, auxiliary load follows direct current bus 1 acquires the electric energy of outside electric wire netting 2 is in order to supply its operation when the power supply of external power supply branch road 10 is unusual, the electric energy that fuel cell operation produced is through inside power supply branch road 20 with direct current bus 1 part provides auxiliary load is in order to supply auxiliary load operation to can omit devices such as static change over switch and reserve auxiliary power source that set up in the traditional art, can reduce fuel cell system's volume and cost, and reduce daily maintenance work. The utility model discloses a fuel cell system, it includes the galvanic pile and steps up device 4, and as above fuel cell auxiliary system, of course also has above-mentioned beneficial effect.
The present invention has been described in terms of several specific embodiments, and it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A fuel cell auxiliary system for cooperating with a stack to effect power generation by operation of a fuel cell system, the fuel cell auxiliary system including an auxiliary load, the fuel cell auxiliary system further comprising:
a DC bus connected to the auxiliary load for supplying electric power to the auxiliary load;
the external power supply branch is connected with the direct current bus and comprises a rectifier, and alternating current of an external power grid is rectified by the rectifier and then is provided to the direct current bus;
the internal power supply branch is connected with the direct current bus, and electric energy generated by the operation of the fuel cell system is transmitted to the direct current bus through the internal power supply branch;
when the power supply of the external power supply branch circuit is normal, the auxiliary load obtains the electric energy of the external power grid from the direct current bus to supply the external power grid to operate, and the electric energy generated by the operation of the fuel cell system is transmitted to a power supply output port through the internal power supply branch circuit and the direct current bus; when the external power supply branch circuit is abnormal in power supply, the electric energy generated by the operation of the fuel cell is supplied to the auxiliary load through the internal power supply branch circuit and the direct current bus part so as to supply the auxiliary load to operate.
2. The fuel cell auxiliary system of claim 1, wherein the dc bus comprises a high voltage dc bus or a high voltage dc bus bar.
3. The fuel cell auxiliary system of claim 1, wherein the external power supply branch includes an inverter that draws power from the dc bus, the inverter being configured to convert dc power drawn from the dc bus to ac power.
4. The fuel cell auxiliary system of claim 3, wherein the auxiliary load comprises an AC powered load operated by the AC power converted by the frequency converter.
5. The fuel cell auxiliary system of claim 4, wherein said inverter has a DC link therein, said DC link being directly connected to said DC bus.
6. The fuel cell auxiliary system of claim 5, wherein the inverter has a braking resistor therein, and the DC bus is connected to the braking resistor of the inverter.
7. The fuel cell auxiliary system of claim 4, wherein the AC powered load comprises an electric machine-like device.
8. The fuel cell auxiliary system of claim 1, wherein the rectifier is an isolated synchronous rectifier.
9. The fuel cell auxiliary system of claim 1, wherein the auxiliary load comprises a dc powered load operated by dc power.
10. A fuel cell system characterized by comprising a stack and a pressure boosting device, and the fuel cell auxiliary system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223396401.2U CN218867921U (en) | 2022-12-16 | 2022-12-16 | Fuel cell auxiliary system and fuel cell system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223396401.2U CN218867921U (en) | 2022-12-16 | 2022-12-16 | Fuel cell auxiliary system and fuel cell system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218867921U true CN218867921U (en) | 2023-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223396401.2U Active CN218867921U (en) | 2022-12-16 | 2022-12-16 | Fuel cell auxiliary system and fuel cell system |
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| CN (1) | CN218867921U (en) |
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- 2022-12-16 CN CN202223396401.2U patent/CN218867921U/en active Active
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