CN110571857A - Energy management coordination system based on photovoltaic and fuel cell combined power generation system - Google Patents

Energy management coordination system based on photovoltaic and fuel cell combined power generation system Download PDF

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Publication number
CN110571857A
CN110571857A CN201910909584.7A CN201910909584A CN110571857A CN 110571857 A CN110571857 A CN 110571857A CN 201910909584 A CN201910909584 A CN 201910909584A CN 110571857 A CN110571857 A CN 110571857A
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China
Prior art keywords
load
fuel cell
hydrogen
photovoltaic
energy
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Pending
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CN201910909584.7A
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Chinese (zh)
Inventor
陈晓高
熊保鸿
顾胜升
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Wuxi Martin Green Photovoltaic Science And Technology Ltd
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Wuxi Martin Green Photovoltaic Science And Technology Ltd
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Priority to CN201910909584.7A priority Critical patent/CN110571857A/en
Publication of CN110571857A publication Critical patent/CN110571857A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

The energy management coordination system comprises a photovoltaic and fuel cell combined power generation system and an energy management coordination system, wherein the photovoltaic and fuel cell combined power generation system comprises a photovoltaic array, a photovoltaic-fuel cell integrated inverter, a proton exchange membrane water electrolysis tank, hydrogen storage equipment, a hydrogen fuel cell, a load, a power grid, a current sensor and an EMS management system, and the energy management coordination system comprises whether to charge a storage battery, whether to charge hydrogen into the hydrogen storage equipment, whether to use the storage battery to supply power to the load, whether to use the hydrogen fuel cell to supply power to the load, whether to remind a user of reducing the use of the load, and whether to forcibly close a secondary load. The invention ensures the continuity of system power supply, further improves the utilization rate of solar energy, and achieves the purpose of realizing annual energy supply and demand balance while meeting the daily requirement of user load.

Description

Energy management coordination system based on photovoltaic and fuel cell combined power generation system
Technical Field
The invention relates to the technical field of new energy, in particular to an energy management coordination system based on a photovoltaic and fuel cell combined power generation system.
background
Solar energy has random and intermittent characteristics, and an independent photovoltaic energy system needs to adopt necessary energy storage equipment to realize continuous and stable supply of electric power. The storage battery has short service life and high price, so the storage battery is not suitable for storing a large amount of energy for a long time, and can be used for meeting the daily requirement of a load for a short time in view of high energy storage efficiency; the hydrogen tank with long service life and low price can be used for storing a large amount of energy for a long time. This can improve the solar energy utilization rate while resisting seasonal variations in illumination. The fuel cell is used only in an emergency situation where the energy storage capacity of the photovoltaic cell and the storage battery is insufficient to meet the load demand, which can reduce the storage capacity of hydrogen and extend the service life of the fuel cell, thereby reducing the initial cost and maintenance cost of the system.
For a standalone photovoltaic energy system, part of the solar energy during the day must be stored to meet the load demand during periods of low or no illumination. In general, the solar energy is more abundant in spring, summer and autumn, and the solar energy is less in winter, so that part of the energy in spring, summer and autumn must be stored to compensate the insufficient sunshine in winter. The energy management strategy aims to coordinate all components of the combined power generation system, meet daily requirements of users on loads and achieve annual energy supply and demand balance.
Disclosure of Invention
The invention aims to overcome the defects, and provides an energy management coordination system based on a photovoltaic and fuel cell combined power generation system, so that the aim of realizing annual energy supply and demand balance while meeting the daily load requirements of users is fulfilled.
The technical scheme of the invention is as follows: the energy management coordination system based on the photovoltaic and fuel cell combined power generation system comprises a photovoltaic and fuel cell combined power generation system and an energy management coordination system, wherein the photovoltaic and fuel cell combined power generation system comprises a photovoltaic array, a photovoltaic-fuel cell integrated inverter, a proton exchange membrane water electrolysis tank, hydrogen storage equipment, a hydrogen fuel cell, a load, a power grid, a current sensor and an EMS management system, and is characterized in that: the photovoltaic-fuel cell integrated inverter is connected with a photovoltaic array, a proton exchange membrane water electrolyzer and a hydrogen fuel cell, a hydrogen storage device is connected between the proton exchange membrane water electrolyzer and the hydrogen fuel cell, the photovoltaic-fuel cell integrated inverter comprises an MPPT control circuit, an inverter circuit and a direct current conversion circuit, the input end of the MPPT control circuit is connected with the photovoltaic array, one path of the output end of the MPPT control circuit is connected with the inverter circuit, the other path of the output end of the MPPT control circuit is connected with the direct current conversion circuit, the output end of the inverter circuit is connected with a load and a current transformer and is also connected with a power grid, the output end of the direct current conversion circuit is connected with the proton exchange membrane water electrolyzer through K1 to carry out hydrogen production control, the output end of the direct current conversion circuit is connected with the hydrogen fuel cell through K2 to carry out hydrogen, Whether to use a battery to supply power to the load, whether to use a hydrogen fuel cell to supply power to the load, whether to alert a user to reduce load usage, whether to forcibly turn off a secondary load.
the EMS management system is respectively connected with the proton exchange membrane water electrolyzer, the MPPT control circuit, the inverter circuit, the direct current conversion circuit, the hydrogen fuel cell and the current transformer.
Whether to charge the storage battery or not and whether to charge hydrogen to the hydrogen storage equipment or not, when the generated energy of the photovoltaic array at a certain moment meets and exceeds the electric quantity required by the load, the storage battery should be charged preferentially, and when the storage battery is fully charged, the hydrogen to the hydrogen storage equipment should be charged by utilizing the proton exchange membrane water electrolyzer.
whether the storage battery is used for supplying power to the load or not and whether the hydrogen fuel cell is used for supplying power to the load or not are judged, when the generated energy of the photovoltaic array cannot meet the electric quantity required by the load at a certain moment, the energy management coordination system calculates the necessary hours for continuous supply of the energy stored in the current storage battery and the hydrogen storage equipment under the premise of the current load usage amount, and the energy management coordination system controls the storage battery to supply power to the load; when the available electric quantity of the storage battery is not enough to supply power to the load at the moment, the energy management coordination system controls the hydrogen fuel cell and the storage battery to supply power to the load at the same time.
whether to remind a user to reduce the use of the load or not and whether to forcibly close the secondary load or not, when the generated energy of the photovoltaic array cannot meet the electric quantity required by the load at a certain moment, the energy management coordination system calculates the number of hours for which the energy stored in the current storage battery and the hydrogen storage equipment cannot be continuously supplied on the premise of the current use quantity of the load, the energy management coordination system calculates whether the storage battery and the hydrogen fuel cell meet the use time of the basic load of the user or not, and if so, the user selects to reduce the use of the secondary load; if not, the time for the secondary load is forced to be reduced by the system to ensure an urgent need for electricity.
The invention has the beneficial effects that: the invention provides an energy management coordination system based on a photovoltaic and fuel cell combined power generation system, wherein the combined power generation system takes a photovoltaic hydrogen production energy storage mode as an energy storage link, and the control method is that when the photovoltaic power generation meets the load power utilization and generates surplus, the surplus energy is stored by electrolyzing water to produce hydrogen; when the photovoltaic power generation can not meet the load power consumption, the stored hydrogen is converted into electric energy through the fuel cell and even jointly supplies power to the load together with the power grid, so that the continuity of system power supply is ensured, the utilization rate of solar energy is improved, and the energy management coordination system achieves the purpose of realizing annual energy supply and demand balance while meeting the daily requirement of the load of a user.
Drawings
Fig. 1 is a schematic structural diagram of a photovoltaic and fuel cell-based combined power generation system.
fig. 2 is a schematic diagram of an energy management coordination system.
In figure 1, 1-photovoltaic array, 2-photovoltaic-fuel cell integrated inverter, 3-proton exchange membrane water electrolyzer, 4-hydrogen storage equipment, 5-hydrogen fuel cell, 6-load, 7-power grid, 8-current transformer, 9-EMS management system, 21-MPPT control circuit, 22-inverter circuit and 23-DC conversion circuit.
In fig. 2, T is the accumulated time of system operation, unit: h, the content of the active carbon is shown in the specification,
Pt1The unit of the electric energy generated by the photovoltaic array in a certain time row is as follows: the content of the KWh is,
Pt2The unit is the electric energy consumed by the load in a certain period: the content of the KWh is,
Pt3=Pt2-Pt1For the electrical energy that the load fails to meet the additional demand by the photovoltaic array for a certain period of time, the unit: the content of the KWh is,
Pt4=Pt1-Pt2For the remaining electric energy of the photovoltaic array after a certain period of time meets the load, the unit is:KWh,
PtaThe unit is the electric energy required to be consumed by the main load in a certain period: the content of the KWh is,
C1The unit is the available electric energy of the storage battery in a certain period: the content of the KWh is,
C2The unit is an electric energy that can be used by a hydrogen tank (the hydrogen tank is converted into electric energy by a fuel cell, and therefore the electric energy is directly used herein to represent the hydrogen storage amount) for a certain period of time: the content of the KWh is,
CaFor the electrical energy that the battery can be used to store, the unit: the content of the KWh is,
CbIs the electrical energy that the hydrogen tank can use to store, the unit: the content of the KWh is,
Pt5=Pt4-CaAnd the surplus electric energy after the storage battery is fully charged, unit: KWh.
Detailed Description
the invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the invention is an energy management coordination system based on a photovoltaic and fuel cell combined power generation system, which is composed of a photovoltaic and fuel cell combined power generation system and an energy management coordination system, wherein the photovoltaic and fuel cell combined power generation system comprises a photovoltaic array 1, a photovoltaic-fuel cell integrated inverter 2, a proton exchange membrane water electrolyzer 3, a hydrogen storage device 4, a hydrogen fuel cell 5, a load 6, a power grid 7, a current sensor 8 and an EMS management system 9, and is characterized in that: the photovoltaic-fuel cell integrated inverter 2 is connected with the photovoltaic array 1, the proton exchange membrane water electrolyzer 3 and the hydrogen fuel cell 5, a hydrogen storage device 4 is connected between the proton exchange membrane water electrolyzer 3 and the hydrogen fuel cell 5, the photovoltaic-fuel cell integrated inverter 2 comprises an MPPT control circuit 21, an inverter circuit 22 and a direct current conversion circuit 23, the input end of the MPPT control circuit 21 is connected with the photovoltaic array 1, one path of the output end of the MPPT control circuit 21 is connected with the inverter circuit 22, the other path of the output end of the MPPT control circuit 21 is connected with the direct current conversion circuit 23, the output end of the inverter circuit 22 is connected with a load 6 and a current transformer 8 and is simultaneously connected with a power grid 7, the output end of the direct current conversion circuit 23 is connected with the proton exchange membrane water electrolyzer 3 through K1 for hydrogen production control, the output end of the direct current conversion circuit 23 is connected, including whether to charge the battery, whether to charge hydrogen gas to the hydrogen storage device 4, whether to use the battery to supply power to the load 6, whether to use the hydrogen fuel cell 5 to supply power to the load 6, whether to remind the user to reduce the use of the load 6, and whether to forcibly turn off the secondary load 6.
the EMS management system 9 is respectively connected with the proton exchange membrane water electrolyzer 3, the MPPT control circuit 21, the inverter circuit 22, the direct current conversion circuit 23, the hydrogen fuel cell 5 and the current transformer 8.
Whether to charge the storage battery or not and whether to charge hydrogen to the hydrogen storage equipment 4 or not, when the generated energy of the photovoltaic array 1 at a certain moment meets and exceeds the electric quantity required by the load 6, the storage battery should be charged preferentially, and when the storage battery is fully charged, the proton exchange membrane water electrolysis tank 3 should be utilized to charge hydrogen to the hydrogen storage equipment 4.
Whether the storage battery is used for supplying power to the load 6 or not and whether the hydrogen fuel cell 5 is used for supplying power to the load 6 or not are used, when the generated energy of the photovoltaic array 1 cannot meet the electric quantity required by the load 6 at a certain moment, the energy management coordination system calculates the necessary hours that the current storage battery and the energy stored in the hydrogen storage equipment 4 can be continuously supplied on the premise of the current usage amount of the load 6, and the energy management coordination system controls the storage battery to supply power to the load 6; when the available electric quantity of the storage battery is not enough to supply power to the load 6 at the moment, the energy management coordination system controls the hydrogen fuel cell 5 and the storage battery to supply power to the load 6 at the same time.
whether to remind a user to reduce the use of the load 6 and whether to forcibly close the secondary load 6, when the generated energy of the photovoltaic array 1 cannot meet the electric quantity required by the load 6 at a certain moment, the energy management coordination system calculates the number of hours for which the energy stored in the current storage battery and the hydrogen storage equipment 4 cannot be continuously supplied on the premise of the current use amount of the load 6, the energy management coordination system calculates whether the storage battery and the hydrogen fuel cell 5 meet the use time of the basic load 6 of the user, and if so, the user selects to reduce the use of the secondary load 6; if not, the time for the secondary load 6 is forced by the system to be reduced to ensure an urgent need for electricity.
The working principle of the invention is as follows:
When the power consumption of the load 6 is close to the photovoltaic power generation power, the system works in a normal photovoltaic grid-connected self-utilization mode; when the power consumption of the load 6 is less than the photovoltaic power generation power, the system preferentially meets the load power consumption through photovoltaic power generation, and the rest power is used for producing hydrogen and storing; when the power consumption of the load 6 is larger than the photovoltaic power generation power, the system adopts a photovoltaic and hydrogen fuel cell 5 combined power generation mode, the photovoltaic array 1 generates power through photovoltaic power, and simultaneously, the stored hydrogen is conveyed to the hydrogen fuel cell 5 to generate power and is supplied to the load 6 together; when no light is present, the photovoltaic system stops generating power, and the system supplies power to the load 6 through the hydrogen fuel cell 5 and the power grid 7.
the energy source of the invention is provided by the solar array, the energy conversion process is that the solar energy is converted into chemical energy, then hydrogen is prepared as the fuel of the fuel cell, and then the chemical energy is released into electric energy without other energy storage devices.
In the invention, the photovoltaic power generation and the hydrogen fuel cell 5 power generation share one set of inverter circuit 22, and the electrolysis hydrogen production and the hydrogen fuel cell 5 share one set of direct current conversion circuit 23, thus greatly saving the hardware cost.
in the invention, the current direction and the threshold value of the grid-connected point are detected by the current transformer 8 to judge the power consumption condition of the photovoltaic power generation and the load 6, and when the current comes from the power grid 7 and is greater than the threshold value, the photovoltaic power generation is less than the power consumption of the load 6; when the current is from the power grid 7 and is smaller than the threshold value, the photovoltaic power generation is close to the power consumption of the load 6; when the current flows to the power grid 7 and is larger than the threshold value, the photovoltaic power generation is larger than the power consumption of the load 6.
in the invention, the power supply system of the hydrogen fuel cell 5 can be used as an energy storage device to store surplus solar energy and can also be used as a standby power supply system to make up for instability and deficiency of solar power supply. When the solar power generation is sufficient, hydrogen is produced by electrolysis of excess solar power and stored as a fuel source for the hydrogen fuel cell 5. When the solar power generation is insufficient or the commercial power can not supply power and emergency power supply is urgently needed, the hydrogen fuel cell 5 can be started to supply power in an auxiliary mode, and the utilization rate of solar energy can be further improved by adding the hydrogen fuel cell 5.
As shown in fig. 2, the electrical energy generated by the photovoltaic array 1 is compared with the demand of the load 6 and then the method of distribution of the energy between the load 6 and the storage elements is determined. The electric energy generated by the photovoltaic array 1 firstly meets the requirements of the load 6 and is preferentially stored in the storage battery if the surplus energy exists. When the storage battery is full of residual energy, the electric energy can be converted into hydrogen through the proton exchange membrane water electrolyzer 3 and stored in the hydrogen storage device 4 after being compressed.
When the photovoltaic array 1 cannot meet the load 6 demand of the user, first, it is determined that the condition 1 (the electric energy that can be used by the storage battery and the hydrogen fuel cell 5 in a certain period of time can meet the extra electric energy (i.e., Pt) that the load 6 cannot meet by the photovoltaic array 1 in the certain period of time3),C1+C2>Pt3). If the condition 1 is met, the requirement is met by the storage battery firstly, and if the electric energy stored by the storage battery is not enough to meet the requirement Pt of the load 63The hydrogen fuel cell 5 is required to supply power at the same time.
If the condition 1 is not satisfied, the condition 2 is determined again (the electric energy which can be used by the battery and the hydrogen fuel cell 5 in a certain period of time can satisfy the electric energy (i.e. Pt) which the main load 6 needs to consume in the certain period of timea),C1+C2>Pta). If the condition 2 is satisfied, the user selects to reduce the use load, if the condition is not satisfied, the system is forced to reduce the secondary load 6, and the emergency power utilization is ensured.
Sufficient energy storage capacity can be designed according to the annual load 6 demand of a user and the abundance degree of the photovoltaic resources in the place to avoid the situation that the load 6 is forcibly thrown away as much as possible.

Claims (5)

1. Energy management coordination system based on photovoltaic and fuel cell combined power generation system comprises photovoltaic and fuel cell combined power generation system and energy management coordination system, photovoltaic and fuel cell combined power generation system includes photovoltaic array (1), photovoltaic-fuel cell integration inverter (2), proton exchange membrane water electrolyser (3), hydrogen storage equipment (4), hydrogen fuel cell (5), load (6), electric wire netting (7), current sensor (8), EMS management system (9), its characterized in that: the photovoltaic-fuel cell integrated inverter (2) is connected with a photovoltaic array (1), a proton exchange membrane water electrolysis bath (3) and a hydrogen fuel cell (5), a hydrogen storage device (4) is connected between the proton exchange membrane water electrolysis bath (3) and the hydrogen fuel cell (5), the photovoltaic-fuel cell integrated inverter (2) comprises an MPPT control circuit (21), an inverter circuit (22) and a direct current conversion circuit (23), the input end of the MPPT control circuit (21) is connected with the photovoltaic array (1), one path of the output end of the MPPT control circuit (21) is connected with the inverter circuit (22), the other path of the output end of the MPPT control circuit is connected with the direct current conversion circuit (23), the output end of the inverter circuit (22) is connected with a load (6) and a current transformer (8) and is simultaneously connected with a power grid (7), the output end of the direct current conversion circuit (23) is, and hydrogen production control is performed, the output end of the direct current conversion circuit (23) is connected with the hydrogen fuel cell (5) through K2 to perform hydrogen energy power generation control, and the energy management coordination system comprises whether to charge the storage battery, whether to charge hydrogen to the hydrogen storage device (4), whether to use the storage battery to supply power to the load (6), whether to use the hydrogen fuel cell (5) to supply power to the load (6), whether to remind a user to reduce the use of the load (6), and whether to forcibly close the secondary load (6).
2. The system for coordinating energy management based on a combined photovoltaic and fuel cell power generation system of claim 1, wherein: the EMS management system (9) is respectively connected with the proton exchange membrane water electrolyzer (3), the MPPT control circuit (21), the inverter circuit (22), the direct current conversion circuit (23), the hydrogen fuel cell (5) and the current transformer (8).
3. The system for coordinating energy management based on a combined photovoltaic and fuel cell power generation system of claim 1, wherein: whether to charge the storage battery or not and whether to charge hydrogen into the hydrogen storage equipment (4) or not, when the generated energy of the photovoltaic array (1) at a certain moment meets and exceeds the electric quantity required by the load (6), the storage battery should be charged preferentially, and when the storage battery is fully charged, the proton exchange membrane water electrolysis tank (3) should be utilized to charge hydrogen into the hydrogen storage equipment (4).
4. The system for coordinating energy management based on a combined photovoltaic and fuel cell power generation system of claim 1, wherein: whether the storage battery is used for supplying power to the load or not and whether the hydrogen fuel cell (5) is used for supplying power to the load (6) or not, when the generated energy of the photovoltaic array (1) cannot meet the electric quantity required by the load (6) at a certain moment, the energy management coordination system calculates the number of hours for which the energy stored in the current storage battery and the hydrogen storage equipment (4) can be continuously supplied on the premise of the current usage of the load (6), and controls the storage battery to supply power to the load (6); when the available electric quantity of the storage battery is not enough to supply power to the load (6) at the moment, the energy management coordination system controls the hydrogen fuel cell (5) and the storage battery to supply power to the load (6) at the same time.
5. The system for coordinating energy management based on a combined photovoltaic and fuel cell power generation system of claim 1, wherein: whether to remind a user to reduce the use of the load (6) or not and whether to forcibly close the secondary load (6) or not, when the generated energy of the photovoltaic array (1) cannot meet the electric quantity required by the load (6) at a certain moment, the energy management coordination system calculates the number of hours for which the energy stored in the current storage battery and the hydrogen storage equipment (4) cannot be continuously supplied on the premise of the use quantity of the current load (6), the energy management coordination system calculates whether the storage battery and the hydrogen fuel cell (5) meet the use time of the basic load (6) of the user or not, and if so, the user selects to reduce the use of the secondary load (6); if not, the system forces a reduction in the time of the secondary load (6) to ensure an emergency demand.
CN201910909584.7A 2019-09-19 2019-09-19 Energy management coordination system based on photovoltaic and fuel cell combined power generation system Pending CN110571857A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113098038A (en) * 2021-04-06 2021-07-09 中国电建集团贵州电力设计研究院有限公司 Photovoltaic hydrogen production energy storage system and energy storage method
CN113364026A (en) * 2021-04-15 2021-09-07 上海毅镤新能源科技有限公司 Data center energy supply system and control method thereof
WO2022064344A1 (en) * 2020-09-23 2022-03-31 SEGALIS, Benyamin An eco-friendly system and method for generating electricity for buildings
CN114268122A (en) * 2021-11-03 2022-04-01 浙江大学杭州国际科创中心 Photovoltaic energy driven power grid power generation, hydrogen production and power storage coupling system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022064344A1 (en) * 2020-09-23 2022-03-31 SEGALIS, Benyamin An eco-friendly system and method for generating electricity for buildings
CN113098038A (en) * 2021-04-06 2021-07-09 中国电建集团贵州电力设计研究院有限公司 Photovoltaic hydrogen production energy storage system and energy storage method
CN113364026A (en) * 2021-04-15 2021-09-07 上海毅镤新能源科技有限公司 Data center energy supply system and control method thereof
CN114268122A (en) * 2021-11-03 2022-04-01 浙江大学杭州国际科创中心 Photovoltaic energy driven power grid power generation, hydrogen production and power storage coupling system

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