CN211790787U - Direct-current micro-grid system applying fuel cell - Google Patents
Direct-current micro-grid system applying fuel cell Download PDFInfo
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- CN211790787U CN211790787U CN202020330698.4U CN202020330698U CN211790787U CN 211790787 U CN211790787 U CN 211790787U CN 202020330698 U CN202020330698 U CN 202020330698U CN 211790787 U CN211790787 U CN 211790787U
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- 239000000446 fuel Substances 0.000 title claims abstract description 42
- 238000004146 energy storage Methods 0.000 claims abstract description 53
- 238000010248 power generation Methods 0.000 claims abstract description 53
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims description 9
- 239000001257 hydrogen Substances 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005868 electrolysis reaction Methods 0.000 claims description 5
- 230000004043 responsiveness Effects 0.000 abstract 1
- 230000004044 response Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Fuel Cell (AREA)
Abstract
The utility model relates to a little grid technical field, concretely relates to use fuel cell's direct current microgrid system uses fuel cell's direct current microgrid system includes the electric wire netting, and first direct current generating line and second direct current generating line connect the energy storage module between first direct current generating line and second direct current generating line, are connected distributed energy power generation module with second direct current generating line, load module is connected to first direct current generating line, first direct current generating line is connected with the electric wire netting. The utility model discloses a microgrid system supplies power to load module through energy storage module during operation, no matter distributed energy power generation module operates in any state, the electric energy that it sent all has energy storage module in advance, the energy demand of load is directly supplied with by energy storage module in the microgrid system, need not to pay close attention to the intermittent type nature condition of the distributed energy, the degree of difficulty of energy scheduling control has been reduced, the responsiveness of microgrid system to the load has been improved, the reliability of microgrid system, stability and expansibility have been strengthened.
Description
Technical Field
The utility model relates to a little grid technical field, concretely relates to use fuel cell's direct current microgrid system.
Background
In recent years, distributed energy power generation technology has been widely developed with the increasing awareness of human beings on environmental protection and the gradual scarcity of fossil fuels. The electricity output by the distributed energy power station is generally direct current, can not be directly used by an alternating current large power grid, and needs to go through a series of complex electric energy conversion processes. Therefore, a concept of a dc Micro-Grid system is proposed, and a Micro-Grid (Micro-Grid) is also translated into a Micro-Grid, which refers to a small power generation and distribution system composed of a distributed power supply, an energy storage device, an energy conversion device, a load, a monitoring and protection device, and the like. The system main body is composed of a direct current bus, so that the access difficulty of distributed energy is reduced, and the cost of power electronic devices is reduced. For a long time, research and development of related technologies of direct current micro-grids have been receiving wide attention from all circles. Communication companies in countries such as Sweden, Japan, France and the United states have started research and introduction of 300-400V data center direct current power distribution in the 90 s of the 20 th century. In addition, direct-current regional power distribution of warships, aviation and automatic systems, especially the electric traction direct-current power supply technology is mature, and a good opportunity is provided for popularization and application of the direct-current micro-grid. In the existing direct current micro-grid technology, distributed energy sources such as wind power generation, photovoltaic power generation, fuel cell power generation and hydrogen production energy power generation mostly transmit electric energy to the same direct current bus through respective DC/DC conversion units, and then the electric energy is output to an alternating current power grid through a DC/AC conversion unit. Therefore, the control of energy scheduling is difficult, timeliness and quick response cannot be achieved, the influence of the problem in an island operation mode is more obvious, and the whole system has dependence on an alternating current large power grid.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an use fuel cell's direct current microgrid system.
The utility model discloses a following scheme realizes:
a direct-current microgrid system using fuel cells comprises a power grid, a first direct-current bus, a second direct-current bus, an energy storage module and a distributed energy generation module, wherein the first direct-current bus is connected between the first direct-current bus and the second direct-current bus; the energy storage module comprises an energy storage battery pack and a fuel cell power generation pack connected with the energy storage battery pack in parallel.
Further, the fuel cell power generation set comprises a fuel cell and a water electrolysis hydrogen production device connected with the fuel cell; the energy storage battery pack comprises a plurality of storage batteries.
Further, the load module comprises at least one direct current load connected with the first direct current bus and at least one alternating current load connected with the first direct current bus.
Further, the direct current load is connected with the first direct current bus through the first DC/DC converter, and the alternating current load is connected with the first direct current bus through the first DC/AC converter.
Furthermore, the energy storage module and the first direct current bus, and the energy storage module and the second direct current bus are connected through a second DC/DC converter, and the first direct current bus and the power grid are connected through an AC/DC converter.
Furthermore, the distributed energy power generation module comprises a photovoltaic power generation unit and a wind power generation unit.
Further, the photovoltaic power generation unit is connected with the second direct current bus through a third DC/DC converter, and the wind power generation unit is connected with the second direct current bus through a second DC/AC converter.
Contrast prior art, the utility model discloses following beneficial effect has:
the utility model discloses connect through energy storage module between two direct current generating lines that set up, energy storage group and the fuel cell power generation group through energy storage module are supplied power to load module when the microgrid system moves, no matter distributed energy power generation module moves in any state, the electric energy that it sent all has energy storage module in advance, the energy demand of load is directly supplied with by energy storage module in the microgrid system, combine the control of energy scheduling in the direct current microgrid system, need not to pay close attention to the intermittent type nature condition of distributed energy, thereby the degree of difficulty of energy scheduling control has been reduced, the response ability of microgrid system to the load has been improved, the reliability of microgrid system has been strengthened, stability and expansibility, make the distributed energy can accomplish plug and play.
Drawings
Fig. 1 is a structural diagram of a dc microgrid system using fuel cells according to the present invention.
The figure includes:
the system comprises a power grid 1, a first direct current bus 2, a direct current load 3, an alternating current load 4, an energy storage battery pack 5, a fuel cell 6, a water electrolysis hydrogen production device 7, a second direct current bus 8, a photovoltaic power generation unit 9, a wind power generation unit 10, a first DC/DC converter 11, a first DC/AC converter 12, a second DC/DC converter 13, an AC/DC converter 14, a third DC/DC converter 15 and a second DC/AC converter 16.
Detailed Description
To facilitate understanding of the present invention for those skilled in the art, the present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
Referring to fig. 1, the utility model provides an applied fuel cell 6's direct current microgrid system, including electric wire netting 1, applied fuel cell 6's direct current microgrid system still includes first direct current generating line 2 and second direct current generating line 8, connects the energy storage module between first direct current generating line 2 and second direct current generating line 8, is connected distributed energy power generation module with second direct current generating line 8, first direct current generating line 2 connects the load module, first direct current generating line 2 is connected with electric wire netting 1; the energy storage module comprises an energy storage battery pack 5 and a fuel cell power generation pack connected with the energy storage battery pack 5 in parallel.
The fuel cell power generation set comprises a fuel cell 6 and a water electrolysis hydrogen production device 7 connected with the fuel cell 6; the energy storage battery pack 5 includes a plurality of storage batteries, and the number of the storage batteries and the number of the fuel cells 6 can be set according to the scale of the microgrid 1 and the load size. The storage battery has strong load response capability, so the storage battery is used as a main power supply energy source. The fuel cell 6 is relatively slow to start up and there is a hysteresis in the load response, typically as a backup power source.
The load module comprises at least one dc load 3 connected to the first dc bus 2 and at least one ac load 4 connected to the first dc bus 2.
The DC load 3 is connected to the first DC bus 2 via a first DC/DC converter 11, and the AC load 4 is connected to the first DC bus 2 via a first DC/AC converter 12.
The energy storage module and the first direct current bus 2 and the energy storage module and the second direct current bus 8 are connected through a second DC/DC converter 13, and the first direct current bus 2 and the power grid 1 are connected through an AC/DC converter 14.
The distributed energy power generation module comprises a photovoltaic power generation unit 9 and a wind power generation unit 10, and tidal power generation, geothermal power generation and the like can be adopted during specific implementation.
The photovoltaic power generation unit 9 is connected to the second DC bus 8 via a third DC/DC converter 15, and the wind power generation unit 10 is connected to the second DC bus 8 via a second DC/AC converter 16. The third DC/DC converter 15 of the photovoltaic power generation unit 9 operates in the MPPT mode, and allows photovoltaic power generation to be input to the second DC bus 8 with the maximum power. The second DC/AC converter 16 of the wind power generation unit 10 controls the energy input amount of the wind power generation to the second DC bus 8 according to the magnitude of the wind force (the energy loss is reduced by changing the operating frequency of the fan by DC/AC).
The specifications of the DC/DC converter, the AC/DC converter, and the DC/AC converter in the present embodiment are set according to the scale of the microgrid 1 and the size of the load.
The utility model discloses in energy storage module discharges and supplies the load module to use to first direct current bus to adjust energy memory's operational mode according to the power demand of load, distributed energy power generation module electricity generation and via the second direct current bus charges to energy storage module, when energy storage battery group charging of energy storage module was accomplished, then produced hydrogen and storage in the electrolytic water hydrogen manufacturing installation of fuel cell power generation group with unnecessary electric quantity input.
The operation modes of the energy storage device comprise a charging mode, a discharging mode and a charging and discharging mode.
The adjusting of the operating mode of the energy storage device comprises the steps of:
step 1, when the load power of a load module is less than 10%, the energy storage module is adjusted to operate in a charging mode, the electric quantity generated by a distributed energy power generation module preferentially charges an energy storage battery pack, and when the energy storage battery pack is charged, redundant electric quantity is input into a water electrolysis hydrogen production device of a fuel cell power generation pack to produce and store hydrogen;
and 3, when the power of the load module is more than 10% of the rated power and the input power of the distributed energy power generation module is more than 10% of the rated power, adjusting the energy storage module to operate in a charge-discharge mode, starting a certain number of storage batteries for supplying power according to the power requirement of the load module, and when the power requirement of the load module exceeds the limit of the energy storage battery pack, supplying power by using the fuel cell power generation pack or cooperatively supplying power by using the fuel cell power generation pack and a power grid (the total power of the load module is more than the total power of the energy storage battery pack and the fuel cell).
In the step 2, if the electric quantity of the energy storage battery pack and the electric quantity of the fuel cell power generation pack are insufficient, power is supplied by a power grid.
The utility model discloses connect through energy storage module between two direct current generating lines that set up, energy storage group and the fuel cell power generation group through energy storage module are supplied power to load module when the microgrid system moves, no matter distributed energy power generation module moves in any state, the electric energy that it sent all has energy storage module in advance, the energy demand of load is directly supplied with by energy storage module in the microgrid system, combine the control of energy scheduling in the direct current microgrid system, need not to pay close attention to the intermittent type nature condition of distributed energy, thereby the degree of difficulty of energy scheduling control has been reduced, the response ability of microgrid system to the load has been improved, the reliability of microgrid system has been strengthened, stability and expansibility, make the distributed energy can accomplish plug and play.
In the description of the present invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection, or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
While the invention has been described in conjunction with the specific embodiments set forth above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the scope of the included claims.
Claims (7)
1. The direct-current microgrid system using the fuel cell comprises a power grid and is characterized by further comprising a first direct-current bus, a second direct-current bus, an energy storage module connected between the first direct-current bus and the second direct-current bus, and a distributed energy power generation module connected with the second direct-current bus, wherein the first direct-current bus is connected with a load module, and the first direct-current bus is connected with the power grid; the energy storage module comprises an energy storage battery pack and a fuel cell power generation pack connected with the energy storage battery pack in parallel.
2. The direct-current microgrid system utilizing fuel cells, as recited in claim 1, wherein the fuel cell power generation group comprises fuel cells, and a water electrolysis hydrogen production device connected with the fuel cells; the energy storage battery pack comprises a plurality of storage batteries.
3. The fuel cell-based dc microgrid system of claim 1, wherein the load module comprises at least one dc load connected to the first dc bus and at least one ac load connected to the first dc bus.
4. The fuel cell-based DC microgrid system according to claim 3, wherein the DC loads are connected to the first DC bus through a first DC/DC converter, and the AC loads are connected to the first DC bus through a first DC/AC converter.
5. The direct current microgrid system using fuel cells is characterized in that the energy storage modules and the first direct current buses and the energy storage modules and the second direct current buses are connected through second DC/DC converters, and the first direct current buses and the power grid are connected through AC/DC converters.
6. The fuel cell-applied direct current microgrid system according to claim 1, wherein the distributed energy power generation module comprises photovoltaic power generation units and wind power generation units.
7. The fuel cell-based direct current microgrid system according to claim 6, characterized in that the photovoltaic power generation units are connected with the second direct current bus through a third DC/DC converter, and the wind power generation units are connected with the second direct current bus through a second DC/AC converter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020330698.4U CN211790787U (en) | 2020-03-17 | 2020-03-17 | Direct-current micro-grid system applying fuel cell |
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| CN202020330698.4U CN211790787U (en) | 2020-03-17 | 2020-03-17 | Direct-current micro-grid system applying fuel cell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113872232A (en) * | 2021-10-20 | 2021-12-31 | 广东电网有限责任公司 | Direct current distribution network topological structure of data center |
| CN114825559A (en) * | 2022-06-22 | 2022-07-29 | 浙江吉利控股集团有限公司 | Intelligent power supply system of vehicle, vehicle and method |
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2020
- 2020-03-17 CN CN202020330698.4U patent/CN211790787U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113872232A (en) * | 2021-10-20 | 2021-12-31 | 广东电网有限责任公司 | Direct current distribution network topological structure of data center |
| CN113872232B (en) * | 2021-10-20 | 2024-04-19 | 广东电网有限责任公司 | DC power distribution network topological structure of data center |
| CN114825559A (en) * | 2022-06-22 | 2022-07-29 | 浙江吉利控股集团有限公司 | Intelligent power supply system of vehicle, vehicle and method |
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