CN114123292B - Photovoltaic grid-connected inverter, control method thereof and photovoltaic hydrogen production system - Google Patents
Photovoltaic grid-connected inverter, control method thereof and photovoltaic hydrogen production system Download PDFInfo
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 97
- 239000001257 hydrogen Substances 0.000 title claims abstract description 97
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 119
- 239000003990 capacitor Substances 0.000 claims abstract description 35
- 230000005611 electricity Effects 0.000 claims description 6
- 230000003044 adaptive effect Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/60—Constructional parts of cells
- C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy
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Abstract
The invention discloses a photovoltaic grid-connected inverter, a control method thereof and a photovoltaic hydrogen production system. The photovoltaic grid-connected inverter includes: a direct current input terminal for connecting to a photovoltaic panel; the input end of the first direct current conversion unit is electrically connected with the direct current input terminal; the input end of the DC-LINK capacitor group is electrically connected with the output end of the first direct current conversion unit; the input end of the second direct current conversion unit is electrically connected with the first output end of the DC-LINK capacitor bank; the direct current output terminal is used for being electrically connected with the electrolytic hydrogen production device to supply power, and the direct current output terminal is electrically connected with the output end of the second direct current conversion unit; an ac connection terminal for connecting to a power grid; and one end of the DC-AC conversion unit is electrically connected with the second output end of the DC-LINK capacitor group, and the other end of the DC-AC conversion unit is electrically connected with the alternating current connection terminal through the relay unit. The invention solves the problem that the photovoltaic grid-connected inverter and the hydrogen production device cannot be directly connected in an adaptive manner, and can ensure friendly and economical power grid.
Description
Technical Field
The invention belongs to the field of photovoltaic inverters, and relates to a control method of a photovoltaic grid-connected inverter, the photovoltaic grid-connected inverter and a photovoltaic hydrogen production system.
Background
Photovoltaic inverters are becoming increasingly important in new energy fields as a core device for converting direct current supplied by Solar modules (Solar modules) into alternating current for civil or industrial use. In recent years, along with the planning of carbon peak and carbon neutralization, green energy has been developed in an explosive manner, and especially, hydrogen energy has become another important energy requirement after wind light energy due to the progress of technologies such as hydrogen energy automobiles, fuel cells and the like. The photovoltaic hydrogen production can effectively avoid wind and light abandoning, and the real green energy maximization is achieved, so how to efficiently and intelligently combine the photovoltaic power generation and the hydrogen energy production has important strategic significance for effectively solving the carbon emission problem in China. At present, although the combination of photovoltaic power generation and hydrogen energy is reported, the current photovoltaic inverter and the hydrogen production device cannot be directly connected in an adaptive manner, and the system cost is high.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a control method of a photovoltaic grid-connected inverter, which solves the problem that the photovoltaic grid-connected inverter and a hydrogen production device cannot be directly connected in an adaptive manner, and can ensure friendly saving of a power grid.
Another object of the invention is to provide a photovoltaic grid-connected inverter which can be directly connected with an electrolytic hydrogen production device in an adapting way, and is friendly and economical to a power grid.
It is yet another object of the present invention to provide a photovoltaic hydrogen production system wherein the photovoltaic grid-connected inverter and the electrolytic hydrogen production device are directly adapted for connection, which is grid friendly and economical.
According to a first aspect of the present invention, a control method of a photovoltaic grid-connected inverter, the photovoltaic grid-connected inverter comprising:
a direct current input terminal for connecting to a photovoltaic panel;
The input end of the first direct current conversion unit is electrically connected with the direct current input terminal;
The input end of the DC-LINK capacitor group is electrically connected with the output end of the first direct current conversion unit;
the input end of the second direct current conversion unit is electrically connected with the first output end of the DC-LINK capacitor bank;
the direct current output terminal is electrically connected with the electrolytic hydrogen production device to supply power for the electrolytic hydrogen production device, and is electrically connected with the output end of the second direct current conversion unit;
an ac connection terminal for connecting to a power grid; and
The DC-AC conversion unit is used for supplying power to the second direct current conversion unit and/or the power grid, one end of the DC-AC conversion unit is electrically connected with the second output end of the DC-LINK capacitor bank, and the other end of the DC-AC conversion unit is electrically connected with the alternating current connection terminal through the relay unit;
the control method comprises the following steps:
s100, comparing the output power of the photovoltaic panel with the maximum power of the electrolytic hydrogen production device;
S101, controlling the output voltage U o of the direct-current output terminal to be shown in the following formula (1) if the output power of the photovoltaic panel is larger than or equal to the maximum power of the electrolytic hydrogen production device:
Uo＝Umax (1)
S102, if the output power of the photovoltaic panel is smaller than the maximum power of the electrolytic hydrogen production device, controlling the output voltage U o of the direct-current output terminal to be as shown in the following formula (2):
In the formulas (1) and (2), U max is the maximum voltage of the electrolytic hydrogen production device, k is the output voltage control coefficient of the second dc conversion unit, P PV max is the maximum output power of the photovoltaic panel, and P o max is the maximum power of the photovoltaic hydrogen production device.
According to a preferred embodiment, in step S101, the first DC conversion unit is controlled to send the remaining power to the power grid through the DC-LINK capacitor bank and the DC-AC unit while satisfying that the electrolytic hydrogen production device is operated at the maximum power.
According to a preferred embodiment, in step S102, if the electricity is in the valley period, the electric energy from the power grid is converted and then supplied to the electrolytic hydrogen production device through the DC-AC conversion unit and the second direct current conversion unit; and if the DC-AC unit is in the peak power period, stopping the operation of the DC-AC unit.
According to a preferred embodiment, the first dc conversion unit is electrically connected to a battery; in step S101, the first DC conversion unit is controlled to send the remaining power to the battery while the electrolytic hydrogen production device is running at the maximum power, and if the power of the photovoltaic panel is still surplus, the remaining power is sent to the power grid through the DC-LINK capacitor bank and the DC-AC unit.
More preferably, in step S102, if the electricity is in the valley period, the electric energy from the power grid is preferentially converted by the DC-AC conversion unit and the second direct current conversion unit and then supplied to the electrolytic hydrogen production device; and if the electric energy of the battery is in the peak electricity period, preferentially controlling the electric energy of the battery to be sent to the electrolytic hydrogen production device through the first direct current conversion unit and the second direct current conversion unit.
According to a preferred embodiment, the DC-AC conversion unit comprises a plurality of conversion switches, each of which is connected in anti-parallel with a diode.
According to a second aspect of the present invention, a photovoltaic grid-connected inverter, the photovoltaic grid-connected inverter comprising:
a direct current input terminal for connecting to a photovoltaic panel;
The input end of the first direct current conversion unit is electrically connected with the direct current input terminal;
The input end of the DC-LINK capacitor group is electrically connected with the output end of the first direct current conversion unit;
the input end of the second direct current conversion unit is electrically connected with the first output end of the DC-LINK capacitor bank;
the direct current output terminal is electrically connected with the electrolytic hydrogen production device to supply power for the electrolytic hydrogen production device, and is electrically connected with the output end of the second direct current conversion unit;
an ac connection terminal for connecting to a power grid;
The DC-AC conversion unit is used for supplying power to the second direct current conversion unit and/or the power grid, one end of the DC-AC conversion unit is electrically connected with the second output end of the DC-LINK capacitor bank, and the other end of the DC-AC conversion unit is electrically connected with the alternating current connection terminal through the relay unit; and
And the control unit is used for executing the control method, and is respectively and electrically connected with the first direct current conversion unit, the second direct current conversion unit, the DC-AC conversion unit and the relay unit.
According to a preferred embodiment, the first dc conversion unit is electrically connected to a battery.
According to a preferred embodiment, the DC-AC conversion unit comprises a plurality of conversion switches, each of which is connected in anti-parallel with a diode. More preferably, the transfer switch is an IGBT or a MOSFET.
According to a preferred embodiment, the dc input terminal, the dc output terminal and the ac connection terminal are respectively disposed on a housing of the photovoltaic grid-connected inverter.
According to a third aspect of the invention, a photovoltaic hydrogen production system comprises the photovoltaic grid-connected inverter and the electrolytic hydrogen production device, wherein the direct-current output terminal is electrically connected with the electrolytic hydrogen production device.
According to a preferred embodiment, the photovoltaic hydrogen production system further comprises a hydrogen storage device, which is connected to the electrolytic hydrogen production device.
Compared with the prior art, the invention has the following advantages:
The photovoltaic grid-connected inverter, the control method and the photovoltaic hydrogen production system effectively solve the problem that the current inverter and the hydrogen production device cannot be directly adapted and connected, and the electrolytic hydrogen production device can be directly connected with the direct current output terminal of the photovoltaic grid-connected inverter so as to enable the system to have lower cost, higher operation efficiency and more convenient installation by utilizing the electric energy of the photovoltaic panel; through the intelligent control of the energy input and hydrogen production load from the photovoltaic panel, the friendly and economical power grid can be well ensured, the maximization of economic benefit and the minimization of system carbon emission are realized, and the method has great significance for the deep application of green energy and the national energy conservation and emission reduction.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a photovoltaic hydrogen production system according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of an exemplary structure of a DC-AC conversion unit.
Fig. 3 is a schematic structural diagram of a photovoltaic system according to embodiment 2 of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, the photovoltaic hydrogen production system of the present embodiment includes a photovoltaic grid-connected inverter 10 and an electrolytic hydrogen production device 8. The photovoltaic grid-connected inverter 10 comprises a first direct current conversion unit 2, a DC-LINK capacitor bank 3, a second direct current conversion unit 6, a DC-AC conversion unit 4, a relay unit 5 and a control unit 7, wherein the units are arranged in a shell of the photovoltaic grid-connected inverter 10. The shell is provided with a direct current input terminal, a direct current output terminal and an alternating current connection terminal, wherein the direct current input terminal is used for being connected with the photovoltaic panel 1, the direct current output terminal is connected with the electrolytic hydrogen production device 8, and the alternating current connection terminal is used for being connected with the power grid 9. The input end of the first dc-dc converting unit 2 is electrically connected to an ac input terminal, and is configured to boost/buck the dc voltage of the electric energy output from the photovoltaic panel 1 to the photovoltaic grid-connected inverter 10. The input end of the DC-LINK capacitor set 3 is electrically connected to the output end of the first DC conversion unit 2, the first output end is electrically connected to the input end of the second DC conversion unit 6, the second output end is electrically connected to one end of the DC-AC conversion unit 4, and the DC-LINK capacitor set 3 is used for supplying the electric energy from the first DC conversion unit 2 to the second DC conversion unit 6 and/or the DC-AC conversion unit 4. The output end of the second direct current conversion unit 6 is electrically connected to the direct current output terminal to supply power to the electrolytic hydrogen production device 8. The other end of the DC-AC conversion unit 4 is electrically connected to an alternating current connection terminal through a relay unit 5 so as to be connected with a power grid 9; the relay unit 5 is used for controlling the on-off of the DC-AC conversion unit 4 and the power grid 9. The control unit 7 is electrically connected to the first DC-DC conversion unit 2, the second DC-DC conversion unit 6, the DC-AC conversion unit 4 and the relay unit 5, respectively, to control the flow direction of the electric energy. The electrolytic hydrogen production device 8 is electrically connected to a dc output terminal, specifically, the electrolytic hydrogen production device 8 may be directly connected to the dc output terminal on the casing of the photovoltaic grid-connected inverter 10 through a cable.
The DC-AC conversion unit 4 can realize bidirectional energy flow between the DC-LINK capacitor bank 3 and the power grid 9, and not only can send the electric energy from the photovoltaic panel 1 to the power grid 9, but also can send the electric energy of the power grid 9 to the DC-LINK capacitor bank 3. Specifically, as shown in fig. 2, the DC-AC conversion unit 4 includes a plurality of transfer switches (switching transistors T1, T2, T3, T4), each of which is connected in reverse parallel with a diode (D1, D2, D3, D4), and the direction of energy transmission is controlled by controlling the on-off of the transfer switch. Further, the transfer switch is an IGBT or a MOSFET.
The electric energy output by the photovoltaic panel 1 can supply power to the DC-LINK capacitor bank 3 through the first direct current conversion unit 2, and the DC-LINK capacitor bank 3 can convert direct current into alternating current through the DC-AC conversion unit 4 and is connected to the power grid 9 through the relay unit 5 so as to realize feeding of the electric energy to the power grid 9; conversely, the electric energy of the power grid 9 can be converted into direct current through the DC-AC conversion unit 4 and supplied to the DC-LINK capacitor bank 3, and the electric energy of the DC-LINK capacitor bank 3 is supplied to the electrolytic hydrogen production device 8 through the second DC conversion unit 6.
The embodiment also provides a control method of the photovoltaic hydrogen production grid-connected inverter, which can automatically realize intelligent control of energy supply of the photovoltaic panel 1 and the power grid 9 and ensure the maximum operation of green energy consumption economic benefit of the electrolytic hydrogen production device 8. The control method specifically comprises the following steps:
S1, comparing the output power of the photovoltaic panel 1 with the maximum power of the electrolytic hydrogen production device 8;
S11, when the output power of the photovoltaic panel 1 is greater than or equal to the maximum power of the electrolytic hydrogen production device 8, controlling the output voltage U o of the direct current output terminal as shown in the following formula (1):
Uo＝Umax (1)；
The first direct current conversion unit 2 is controlled to transmit the residual power to the power grid 9 through the DC-LINK capacitor bank 3 and the DC-AC unit while meeting the condition that the electrolytic hydrogen production device 8 operates at the maximum power;
S12, if the output power of the photovoltaic panel 1 is smaller than the maximum power of the electrolytic hydrogen production device 8, controlling the output voltage U o of the dc output terminal as shown in the following formula (2):
meanwhile, if the power supply is in the valley period, the electric energy from the power grid 9 is converted through the DC-AC conversion unit 4 and the second direct current conversion unit 6 and then supplied to the electrolytic hydrogen production device 8; if the DC-AC unit is in the peak power period, the DC-AC unit stops working.
In the formulas (1) and (2), U max is the maximum voltage at which the electrolytic hydrogen production device 8 operates, k is the output voltage control coefficient of the second dc conversion unit 6, P PV max is the maximum output power of the photovoltaic panel 1, and P o max is the maximum power of the photovoltaic hydrogen production device.
In the control method, when the power of the photovoltaic panel 1 is larger than or equal to the maximum power P o max of the electrolytic hydrogen production device 8, the output voltage of the second direct current conversion unit 6 is controlled to be U o＝Umax, and the first direct current conversion unit 2 synchronously feeds the residual power to the power grid 9 while meeting the maximum power operation of the hydrogen production device; when the power of the photovoltaic panel 1 is smaller than the maximum power P o max of the electrolytic hydrogen production device 8, the output voltage of the second direct current conversion unit 6 is controlled to beSo as to adjust the real-time power of the electrolytic hydrogen production device 8 and further ensure that the photovoltaic panel 1 always supplies power to the electrolytic hydrogen production device 8 with the maximum power. Meanwhile, when the power of the photovoltaic panel 1 is smaller than the maximum power P o max of the electrolytic hydrogen production device 8, if the photovoltaic panel is in a valley period, the electric energy of the synchronous application power grid 9 supplies power to the electrolytic hydrogen production device 8 through the DC-AC conversion unit 4 and the second direct current conversion unit 6; if the power supply is in the peak power period, the DC-AC unit stops working and does not use the electric energy of the electric network 9, so that the energy consumption of the electrolytic hydrogen production device 8 is ensured to be operated in a green and economic benefit maximizing mode and the electric network 9 is completely friendly.
Example 2
The photovoltaic grid-connected inverter 10 of this embodiment is basically the same as embodiment 1, except that: the photovoltaic grid-connected inverter system of the present embodiment further includes a battery 21 and a hydrogen storage device 22. As described with reference to fig. 2, the first dc conversion unit 2 is electrically connected to the battery 21, and the battery 21 is a rechargeable battery 21. The hydrogen storage device 22 is connected with the electrolytic hydrogen production device 8 through a hydrogen pipeline.
The electric energy output by the photovoltaic panel 1 can supply power to the DC-LINK capacitor bank 3 and the battery 21 through the first direct current conversion unit 2, and the DC-LINK capacitor bank 3 can convert direct current into alternating current through the DC-AC conversion unit 4 and is connected to the power grid 9 through the relay unit 5 so as to realize feeding of the electric energy to the power grid 9; conversely, the electric energy of the power grid 9 can be converted into direct current through the DC-AC conversion unit 4 and supplied to the DC-LINK capacitor bank 3, and the electric energy of the DC-LINK capacitor bank 3 is supplied to the electrolytic hydrogen production device 8 through the second DC conversion unit 6. The energy of the battery 21 can be supplied to the first direct current conversion unit 2, and then the electrolytic hydrogen production device 8 is supplied with power through the DC-LINK capacitor bank 3 and the second direct current conversion unit 6.
The control method of the embodiment specifically includes the following steps:
S1, comparing the output power of the photovoltaic panel 1 with the maximum power of the electrolytic hydrogen production device 8;
S11, when the output power of the photovoltaic panel 1 is greater than or equal to the maximum power of the electrolytic hydrogen production device 8, controlling the output voltage U o of the direct current output terminal as shown in the following formula (1):
Uo＝Umax (1)；
The first direct current conversion unit 2 is controlled to send the residual power to the battery 21 while meeting the condition that the electrolytic hydrogen production device 8 operates at the maximum power, and if the power of the photovoltaic panel 1 is still surplus, the residual power is sent to the power grid 9 through the DC-LINK capacitor bank 3 and the DC-AC unit;
S12, if the output power of the photovoltaic panel 1 is smaller than the maximum power of the electrolytic hydrogen production device 8, controlling the output voltage U o of the dc output terminal as shown in the following formula (2):
meanwhile, if the power supply is in the valley period, the electric energy from the power grid 9 is supplied to the electrolytic hydrogen production device 8 after being converted by the DC-AC conversion unit 4 and the second direct current conversion unit 6 preferentially; if the electric power is in the peak power period, the electric power of the battery 21 is preferentially controlled to be sent to the electrolytic hydrogen production device 8 through the first direct current conversion unit 2 and the second direct current conversion unit 6.
The photovoltaic grid-connected inverter 10 can be directly connected with the electrolytic hydrogen production device 8 for application through the second direct current conversion unit 6, so that the efficiency and the application convenience of the system are greatly improved. All switching tubes such as IGBT or MSFET of the DC-AC conversion unit 4 are provided with anti-parallel diodes, and the second DC conversion unit 6 can automatically control the output voltage and the output power thereof according to the requirements of the electrolytic hydrogen production device 8 and an intelligent economic benefit model, thereby effectively ensuring the maximization of the energy efficiency and the economical efficiency of the hydrogen production device.
The above-described embodiments are provided for illustrating the technical concept and features of the present invention, and are intended to be preferred embodiments for those skilled in the art to understand the present invention and implement the same according to the present invention, not to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A control method of a photovoltaic grid-connected inverter, characterized in that the photovoltaic grid-connected inverter comprises:
a direct current input terminal for connecting to a photovoltaic panel;
The input end of the first direct current conversion unit is electrically connected with the direct current input terminal;
The input end of the DC-LINK capacitor group is electrically connected with the output end of the first direct current conversion unit;
the input end of the second direct current conversion unit is electrically connected with the first output end of the DC-LINK capacitor bank;
the direct current output terminal is electrically connected with the electrolytic hydrogen production device to supply power for the electrolytic hydrogen production device, and is electrically connected with the output end of the second direct current conversion unit;
an ac connection terminal for connecting to a power grid; and
The DC-AC conversion unit is used for supplying power to the second direct current conversion unit and/or the power grid, one end of the DC-AC conversion unit is electrically connected with the second output end of the DC-LINK capacitor bank, and the other end of the DC-AC conversion unit is electrically connected with the alternating current connection terminal through the relay unit;
the control method comprises the following steps:
s100, comparing the output power of the photovoltaic panel with the maximum power of the electrolytic hydrogen production device;
S101, controlling the output voltage U o of the direct-current output terminal to be shown in the following formula (1) if the output power of the photovoltaic panel is larger than or equal to the maximum power of the electrolytic hydrogen production device:
Uo＝Umax (1)
S102, if the output power of the photovoltaic panel is smaller than the maximum power of the electrolytic hydrogen production device, controlling the output voltage U o of the direct-current output terminal to be as shown in the following formula (2):
In the formulas (1) and (2), U max is the maximum voltage of the electrolytic hydrogen production device, k is the output voltage control coefficient of the second dc conversion unit, P PV max is the maximum output power of the photovoltaic panel, and P o max is the maximum power of the photovoltaic hydrogen production device.
2. The control method according to claim 1, characterized in that in step S101, the first direct current conversion unit is controlled to supply the remaining power to the power grid through the DC-LINK capacitor bank and the DC-AC unit while satisfying the operation of the electrolytic hydrogen production device at the maximum power.
3. The control method according to claim 1, wherein in step S102, if the electricity is in the valley period, the electric energy from the electric grid is converted and supplied to the electrolytic hydrogen production device through the DC-AC conversion unit and the second direct current conversion unit; and if the DC-AC unit is in the peak power period, stopping the operation of the DC-AC unit.
4. The control method according to claim 1, wherein the first dc conversion unit is electrically connected to a battery; in step S101, the first DC conversion unit is controlled to send the remaining power to the battery while the electrolytic hydrogen production device is running at the maximum power, and if the power of the photovoltaic panel is still surplus, the remaining power is sent to the power grid through the DC-LINK capacitor bank and the DC-AC unit.
5. The control method according to claim 4, wherein in step S102, if the electricity is in the valley period, the electric energy from the electric grid is supplied to the electrolytic hydrogen production device after being converted by the DC-AC conversion unit and the second direct current conversion unit preferentially; and if the electric energy of the battery is in the peak electricity period, preferentially controlling the electric energy of the battery to be sent to the electrolytic hydrogen production device through the first direct current conversion unit and the second direct current conversion unit.
6. The control method according to claim 1, wherein the DC-AC converting unit includes a plurality of transfer switches, each of the transfer switches being connected in anti-parallel with a diode.
7. A photovoltaic grid-tie inverter, the photovoltaic grid-tie inverter comprising:
a direct current input terminal for connecting to a photovoltaic panel;
The input end of the first direct current conversion unit is electrically connected with the direct current input terminal;
The input end of the DC-LINK capacitor group is electrically connected with the output end of the first direct current conversion unit;
the input end of the second direct current conversion unit is electrically connected with the first output end of the DC-LINK capacitor bank;
the direct current output terminal is electrically connected with the electrolytic hydrogen production device to supply power for the electrolytic hydrogen production device, and is electrically connected with the output end of the second direct current conversion unit;
an ac connection terminal for connecting to a power grid;
The DC-AC conversion unit is used for supplying power to the second direct current conversion unit and/or the power grid, one end of the DC-AC conversion unit is electrically connected with the second output end of the DC-LINK capacitor bank, and the other end of the DC-AC conversion unit is electrically connected with the alternating current connection terminal through the relay unit; and
A control unit for executing the control method according to any one of claims 1 to 5, the control unit being electrically connected to the first DC conversion unit, the second DC conversion unit, the DC-AC conversion unit, and the relay unit, respectively.
8. The photovoltaic grid-connected inverter of claim 7, wherein the first dc-to-dc conversion unit is electrically connected to a battery; and/or, the DC-AC conversion unit comprises a plurality of conversion switches, and each conversion switch is reversely connected with a diode in parallel.
9. The photovoltaic grid-tied inverter of claim 7, wherein the dc input terminal, the dc output terminal, and the ac connection terminal are each disposed on a housing of the photovoltaic grid-tied inverter.
10. A photovoltaic hydrogen production system comprising a photovoltaic grid-connected inverter as claimed in any one of claims 7 to 9 and an electrolytic hydrogen production device, the dc output terminal being electrically connected to the electrolytic hydrogen production device.
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