CN113949054A - Power grid autonomous system and method - Google Patents
Power grid autonomous system and method Download PDFInfo
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- CN113949054A CN113949054A CN202110648238.5A CN202110648238A CN113949054A CN 113949054 A CN113949054 A CN 113949054A CN 202110648238 A CN202110648238 A CN 202110648238A CN 113949054 A CN113949054 A CN 113949054A
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- 238000010248 power generation Methods 0.000 claims abstract description 135
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 239000001257 hydrogen Substances 0.000 claims abstract description 67
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 67
- 238000004146 energy storage Methods 0.000 claims abstract description 41
- 230000005611 electricity Effects 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000000446 fuel Substances 0.000 claims description 16
- 238000003860 storage Methods 0.000 claims description 12
- 238000005868 electrolysis reaction Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
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- 229910000147 aluminium phosphate Inorganic materials 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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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
-
- 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
- H02J2300/28—The renewable source being wind energy
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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
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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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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- Engineering & Computer Science (AREA)
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- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a power grid autonomous system and a method, and relates to the technical field of power engineering. The power grid autonomous system comprises a wind power generation unit, a photovoltaic power generation unit, a hydrogen energy generation unit, an energy storage unit and a direct current load unit which are respectively connected with a direct current bus; the wind power generation unit comprises a wind power generator and an AC/DC module, wherein the wind power generator is used for converting wind energy into alternating current, and the AC/DC module is used for converting the alternating current into first direct current; the photovoltaic power generation unit comprises a photovoltaic power generation assembly and a first DC/DC module; the hydrogen energy power generation unit is used for converting hydrogen energy into third direct current; the energy storage unit comprises an energy storage module and a second DC/DC module, and the energy storage module is used for storing and discharging electricity through the second DC/DC module; the direct current load unit comprises a direct current load and a third DC/DC module. Therefore, voltage and power fluctuation can be effectively reduced, the requirement of high-power impact direct current load can be met, and the reliability and stability of the system are improved.
Description
Technical Field
The disclosure relates to the technical field of power engineering, in particular to a power grid autonomous system and a method.
Background
The micro-grid is a small-sized power generation/distribution/utilization system formed by collecting a distributed power supply, an energy conversion device, a load, a monitoring and protection device and the like, and is a system capable of realizing self control and management. The micro-grid can be regarded as a small-sized power system and has complete power generation, distribution and utilization functions.
The existing new energy power generation mainly comprises wind power generation and photovoltaic power generation, and has certain intermittence and fluctuation, so that the conditions of uneven generated output and unstable power and voltage exist, and the power grid is greatly influenced. Therefore, how to optimize the micro-grid system and ensure the stable and reliable operation of the grid system is a problem which needs to be solved urgently at present.
Disclosure of Invention
The disclosure provides a power grid autonomous system and a method.
According to a first aspect of the present disclosure, there is provided a grid autonomous system, comprising a wind power generation unit, a photovoltaic power generation unit, a hydrogen energy generation unit, an energy storage unit and a direct current load unit, which are respectively connected to a direct current bus;
the wind power generation unit comprises a wind power generator and an AC/DC module, wherein the wind power generator is used for converting wind energy into alternating current, and the AC/DC module is used for converting the alternating current into first direct current;
the photovoltaic power generation unit comprises a photovoltaic power generation assembly and a first DC/DC module, and the first DC/DC module is used for transmitting second direct current generated by the photovoltaic power generation assembly to the direct current bus;
the hydrogen energy power generation unit is used for converting hydrogen energy into third direct current;
the energy storage unit comprises an energy storage module and a second DC/DC module, and the energy storage module
For storing and discharging electricity through the second DC/DC module;
the direct current load unit comprises a direct current load and a third DC/DC module, wherein the third DC/DC module is connected with the direct current bus and is used for converting the voltage of fourth direct current received from the direct current bus.
According to a second aspect of the present disclosure, there is provided a grid autonomous method comprising:
acquiring first generating power output by a wind power generation unit;
acquiring second generating power output by the photovoltaic power generation unit;
and carrying out electrolytic treatment on the water under the condition that the sum of the first generating power and the second generating power is greater than a preset threshold value.
The power grid autonomous system and the method provided by the embodiment of the disclosure have at least the following beneficial effects:
the power grid autonomous system in the embodiment of the disclosure comprises a wind power generation unit, a photovoltaic power generation unit, a hydrogen energy generation unit, an energy storage unit and a direct current load unit which are respectively connected with a direct current bus. The wind power generation unit comprises a wind power generator and an AC/DC module, wherein the wind power generator is used for converting wind energy into alternating current, and the AC/DC module is used for converting the alternating current into first direct current. The photovoltaic power generation unit comprises a photovoltaic power generation assembly and a first DC/DC module, wherein the first DC/DC module is used for transmitting second direct current generated by the photovoltaic power generation assembly to the direct current bus. The hydrogen energy power generation unit is used for converting hydrogen energy into third direct current. The energy storage unit comprises an energy storage module and a second DC/DC module, and the energy storage module is used for storing and discharging electricity through the second DC/DC module. The direct-current load unit comprises a direct-current load and a third DC/DC module, wherein the third DC/DC module is connected with the direct-current bus and is used for performing voltage conversion on fourth direct current received from the direct-current bus. Therefore, the wind power generation unit, the photovoltaic power generation unit, the hydrogen energy power generation unit, the energy storage unit and the direct current load unit are connected through the direct current bus, rectification and inversion equipment is reduced, the system complexity is reduced, the safety and reliability are improved, energy is stored by the energy storage unit, the voltage and power fluctuation can be effectively reduced, the requirement of high-power impact direct current load can be effectively met, and the reliability and stability of the system are improved.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present disclosure, nor do they limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The drawings are included to provide a better understanding of the present solution and are not to be construed as limiting the present disclosure. Wherein:
fig. 1 is a schematic structural diagram of a power grid autonomous system provided according to a first embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another grid autonomous system provided according to the first embodiment of the disclosure
Fig. 3 is a schematic flow chart of a power grid autonomous method according to another embodiment of the present disclosure.
Detailed Description
Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings, in which various details of the embodiments of the disclosure are included to assist understanding, and which are to be considered as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present disclosure. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
A grid autonomous system and method provided by the present disclosure are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an electrical grid autonomous system according to an embodiment of the present disclosure.
As shown in fig. 1, the grid autonomous system 10 includes a wind power generation unit 110, a photovoltaic power generation unit 120, a hydrogen energy generation unit 130, an energy storage unit 140, a dc load unit 150, and a dc bus 100.
As shown in fig. 2, the wind power generation unit 110 may include a wind power generator 111 for converting wind power into alternating current and an AC/DC module 112 for converting the alternating current into a first direct current.
It is understood that under the influence of wind force, a wind generator can convert the kinetic energy of the wind into alternating current electrical energy. The wind power generator may include a wind wheel, a generator, a direction regulator, a tower, and other components, which are not limited herein.
The first direct current is the direct current obtained by converting the alternating current of the system through the AC/DC module. The system provides a first direct current to the direct current bus after converting the alternating current to the first direct current.
As shown in fig. 2, the photovoltaic power generation unit may include a photovoltaic power generation assembly 121 and a first DC/DC module 122, where the first DC/DC module 122 is configured to transmit a second direct current generated by the photovoltaic power generation assembly 121 to the direct current bus 100.
The photovoltaic power generation assembly may include a photovoltaic panel, a photovoltaic support, a combiner box, a controller, and other components, which are not limited herein. The photovoltaic cell panel may be a polycrystalline photovoltaic cell panel, a single crystal photovoltaic cell panel, a heterojunction photovoltaic cell panel, a perovskite photovoltaic cell panel, or the like, and is not limited herein.
The first DC/DC module can be used for converting direct-current input voltage generated by the photovoltaic power generation assembly into effective output fixed voltage.
It is understood that the photovoltaic power generation assembly can convert light energy into electric energy under the condition of illumination. The second direct current is the direct current provided by the system to the direct current bus through the first DC/DC module after the photovoltaic power generation assembly converts the light energy into the electric energy.
As shown in fig. 2, the DC load unit may include a DC load 151 and a third DC/DC module 152, where the third DC/DC module 152 is connected to the DC bus 100 for converting the voltage of the fourth DC power received from the DC bus.
The dc load may be an electric device using dc power as an input, and may be a normal load, an accident load, and an impact load, which are not limited. It will be appreciated that different dc loads may correspond to different power and voltage requirements. Therefore, when the direct current is input to the direct current load from the direct current bus, the system can perform voltage conversion on the voltage of the fourth direct current through the third DC/DC module so as to distribute the voltage meeting the power consumption requirement to the direct current load for consumption by the direct current load.
The system can select a corresponding voltage grade according to the electric power corresponding to the direct-current load, and the fourth direct current is converted into the direct current corresponding to the electric power of the direct-current load through the third DC/DC module.
As shown in fig. 2, the energy storage unit 140 may include an energy storage module 141 and a second DC/DC module 142.
Alternatively, the energy storage module 141 may include various components such as a storage battery, a super capacitor, and a flywheel, which are not limited herein.
It should be noted that the energy storage module 141 may be connected to the DC bus through the second DC/DC module 142.
Optionally, as shown in fig. 2, the system may further include a control unit 160, where the control unit is connected to the wind power generation unit 110, the photovoltaic power generation unit 120, the energy storage unit 140, the direct current load unit 150, and the hydrogen power generation unit 130, respectively, and is configured to adjust the operating states of the wind power generation unit, the photovoltaic power generation unit, the energy storage unit, the direct current load unit, and the hydrogen power generation unit according to the current direct current load.
It can be understood that, if the sum of the generated powers of the wind power generation unit and the photovoltaic power generation unit is greater than the power that can be borne by the dc load, the electrical equipment corresponding to the dc load may be damaged, and the electrical safety may be affected. If the sum of the generated power of the wind power generation unit and the photovoltaic power generation unit is less than the power required by the direct current load, the direct current load is difficult to reach a stable operation state and cannot work normally. Therefore, the system can adjust and control the working states of the wind power generation unit, the photovoltaic power generation unit, the energy storage unit, the direct current load unit and the hydrogen energy power generation unit according to the current direct current load, so that the power output of the whole system can meet the power demand of the direct current load, and the stable and reliable operation of the system is maintained.
Optionally, the control unit may control the energy storage unit to discharge the dc bus when the sum of the generated powers of the wind power generation unit and the photovoltaic power generation unit is lower than a preset threshold, where the preset threshold is determined based on the power consumption of the dc load.
In addition, when the sum of the generated power of the wind power generation unit and the photovoltaic power generation unit is larger than a preset threshold value, the energy storage unit is controlled to receive fifth direct current of the direct current bus through the second DC/DC module.
It can be understood that a threshold value, that is, a preset threshold value, may be set according to the power consumption of the dc load, and if the sum of the current power generation powers of the wind power generation unit and the photovoltaic power generation unit is greater than the preset threshold value, it indicates that the current power generation power exceeds the power required by the dc load. Therefore, the system can utilize the control unit to control the energy storage unit to transmit the direct current to the energy storage module through the direct current bus, so as to receive the excessive electric energy.
Specifically, under the condition that the sum of the generated power of the current wind power generation unit and the current photovoltaic power generation unit is smaller than a preset threshold value, the control unit can control the energy storage unit to discharge the direct-current bus, so that the power utilization support is provided for the direct-current load. Therefore, the fluctuation and intermittence of the photovoltaic power generation assembly and the wind driven generator during power generation can be effectively reduced, and power and voltage support can be provided for the photovoltaic power generation assembly and the wind driven generator under the condition that an impact load is connected into a power grid system.
As shown in fig. 2, the hydrogen energy generation unit may include a direct current hydrogen production module 131, a hydrogen storage module 133, a fourth DC/DC module 131, a fuel cell, and a fifth DC/DC module.
The direct current hydrogen production module may include components such as a water electrolysis device, a water storage tank, a cooler, a separator, a dryer, and a controller, which are not limited herein. The water electrolysis device of the direct current hydrogen production module may be an alkaline water electrolysis device, a proton exchange membrane water electrolysis device, an anion exchange membrane water electrolysis device, a solid oxide water electrolysis device, or the like, and is not limited herein.
The fuel cell may include a proton exchange membrane fuel cell, a solid oxide fuel cell, a phosphoric acid fuel cell, and an alkaline fuel cell, which is not limited herein.
The hydrogen storage module may be a hydrogen storage tank, a hydrogen storage bottle, etc., and is not limited herein.
Optionally, under the condition that the sum of the generated powers of the wind power generation unit and the photovoltaic power generation unit is greater than the preset threshold, the system may control the hydrogen energy generation unit to receive sixth direct current from the direct current bus through the fourth DC/DC module by using the control unit, and then control the hydrogen energy generation unit to electrolyze water through the direct current hydrogen production module to produce hydrogen, and store the hydrogen into the hydrogen storage module.
Wherein the sixth direct current may be direct current received by the hydrogen power generation unit from the direct current bus through the fourth DC/DC module for electrolyzing water.
Specifically, if the sum of the generated power of the wind power generation unit and the generated power of the photovoltaic power generation unit is greater than a preset threshold value, the system can produce hydrogen according to surplus electric energy. The system can perform direct-current electrolysis treatment on water through the direct-current hydrogen production module to produce hydrogen, and then store the hydrogen into the hydrogen storage module. In addition, the oxygen obtained by the direct current electrolysis of water may be stored for use in the system, which is not limited herein.
Optionally, when the sum of the generated powers of the wind power generation unit and the photovoltaic power generation unit is lower than a preset threshold, the system may control the hydrogen energy generation unit to generate power through the fuel cell by using the control unit, and then transmit the third direct current generated by the fuel cell to the direct current bus through the fifth DC/DC module.
The third direct current may be generated by the fuel cell, and the fifth DC/DC module may be configured to convert the input voltage generated by the fuel cell into an effectively fixed output voltage and transmit the output voltage to the direct current bus, which is not limited herein.
Specifically, if the sum of the generated power of the wind power generation unit and the photovoltaic power generation unit is lower than a preset threshold, it indicates that the current generated power is not enough to support the power demand of the direct-current load. Therefore, the system can control the hydrogen energy power generation unit to generate power through the fuel cell through the control unit, and then direct current generated by the fuel cell is transmitted to the direct current bus through the fifth DC/DC module to be consumed by the direct current load.
Optionally, the control unit may be configured to control the direct-current load unit to perform voltage conversion on the fourth direct current received from the direct-current bus through the third DC/DC module after determining the voltage level corresponding to the direct-current load according to the power consumption of the direct-current load.
It will be appreciated that different dc loads may correspond to different power and voltage requirements. Therefore, when the direct current is input to the direct current load from the direct current bus, the control unit is used for controlling the direct current load unit to perform voltage conversion on the voltage of the fourth direct current through the third DC/DC module so as to distribute the voltage meeting the power consumption requirement to the direct current load for consumption by the direct current load.
It should be noted that the grid autonomous system can be applied to various scenes, such as a family, an industrial park, a plateau frontier, an island, a mine, a large wind power photovoltaic and other new energy power generation stations, and is not limited herein.
The power grid autonomous system in the embodiment of the disclosure comprises a wind power generation unit, a photovoltaic power generation unit, a hydrogen energy generation unit, an energy storage unit and a direct current load unit which are respectively connected with a direct current bus. The wind power generation unit comprises a wind power generator and an AC/DC module, wherein the wind power generator is used for converting wind energy into alternating current, and the AC/DC module is used for converting the alternating current into first direct current. The photovoltaic power generation unit comprises a photovoltaic power generation assembly and a first DC/DC module, wherein the first DC/DC module is used for transmitting second direct current generated by the photovoltaic power generation assembly to the direct current bus. The hydrogen energy power generation unit is used for converting hydrogen energy into third direct current. The energy storage unit comprises an energy storage module and a second DC/DC module, and the energy storage module is used for storing and discharging electricity through the second DC/DC module. The direct-current load unit comprises a direct-current load and a third DC/DC module, wherein the third DC/DC module is connected with the direct-current bus and is used for performing voltage conversion on fourth direct current received from the direct-current bus. Therefore, the wind power generation unit, the photovoltaic power generation unit, the hydrogen energy power generation unit, the energy storage unit and the direct current load unit are connected through the direct current bus, rectification and inversion equipment is reduced, the system complexity is reduced, the safety and reliability are improved, energy is stored by the energy storage unit, the voltage and power fluctuation can be effectively reduced, the requirement of high-power impact direct current load can be effectively met, and the reliability and stability of the system are improved.
Fig. 3 is a schematic flow chart of a power grid autonomous method according to an embodiment of the present disclosure.
It should be noted that the grid autonomous method may be executed by the grid autonomous system in the above embodiments, and is not limited herein.
As shown in fig. 3, the grid autonomous method includes the following steps:
step S101, acquiring first generating power output by the wind power generation unit.
The first power generation power may be power output by a generator of a wind power generation unit, and the wind power generation unit may be any wind power generation device capable of converting kinetic energy of wind into electrical energy, such as a vertical axis wind power generator, a horizontal axis wind power generator, a small wind power generator, and a household wind power generator, which are not limited herein.
It is understood that after the wind power unit outputs the first generating power, the electric energy may be transferred to the dc bus, and thus the system may obtain the first generating power.
And step S102, acquiring second generated power output by the photovoltaic power generation unit.
The second power generation power may be power output by the photovoltaic power generation unit through power generation, and the photovoltaic power generation unit may be any photovoltaic power generation device capable of converting light energy into electric energy, such as a polycrystalline photovoltaic cell panel, a monocrystalline photovoltaic cell panel, a heterojunction photovoltaic cell panel, a perovskite photovoltaic cell panel, and the like, which is not limited herein.
It is understood that after the photovoltaic power generation unit outputs the second generated power, the electric energy may be transmitted to the dc bus, and thus, the system may obtain the second generated power.
And step S103, carrying out electrolysis treatment on the water under the condition that the sum of the first generated power and the second generated power is greater than a preset threshold value.
The preset threshold value can be a threshold value set by the system according to the power consumption of the electric equipment, and if the sum of the power generation powers of the current wind power generation unit and the current photovoltaic power generation unit is greater than the preset threshold value, it is indicated that the current power generation power exceeds the power required by the normal work of the electric equipment.
It should be noted that, if the sum of the first generated power and the second generated power is greater than the preset threshold, the system may perform electrolysis on the water to consume the surplus power generated by the photovoltaic power generation unit and the wind power generation unit. It can be understood that surplus power is difficult to store, and clean and low-carbon consumption electric energy can be realized by electrolyzing water by using surplus electric energy.
Optionally, after the water is electrolyzed, the system may store hydrogen obtained by electrolyzing the water, and generate electricity using the hydrogen when the sum of the first generated power and the second generated power is less than a preset threshold.
Specifically, the system can obtain hydrogen and oxygen by electrolyzing water. Wherein, hydrogen is a clean energy, and this system can be preserved hydrogen through hydrogen storage tank or hydrogen storage bottle. In addition, the system may also store oxygen for other oxygen requirements of the system, and is not limited herein.
It should be noted that, if the sum of the first generated power and the second generated power is smaller than the preset threshold, it indicates that the current generated power is not enough to support the power consumption of the electric equipment, and therefore, the system may generate power by using hydrogen, for example, hydrogen is used to generate power by a fuel cell, which is not limited herein. Thus, the system can provide the electric energy obtained by using the hydrogen gas to the electric equipment to realize energy supply.
According to the system in the embodiment of the disclosure, first generating power output by a wind power generation unit is obtained, then second generating power output by a photovoltaic power generation unit is obtained, and then water is electrolyzed under the condition that the sum of the first generating power and the second generating power is larger than a preset threshold value. Therefore, surplus power generated by the system can be consumed by electrolyzing water, and conditions can be provided for power generation by utilizing hydrogen by electrolyzing water, so that the balance and stability of the system are improved.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present disclosure may be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved, and the present disclosure is not limited herein.
The above detailed description should not be construed as limiting the scope of the disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present disclosure should be included in the scope of protection of the present disclosure.
Claims (9)
1. A power grid autonomous system is characterized by comprising a wind power generation unit, a photovoltaic power generation unit, a hydrogen energy generation unit, an energy storage unit and a direct current load unit which are respectively connected with a direct current bus;
the wind power generation unit comprises a wind power generator and an AC/DC module, wherein the wind power generator is used for converting wind energy into alternating current, and the AC/DC module is used for converting the alternating current into first direct current;
the photovoltaic power generation unit comprises a photovoltaic power generation assembly and a first DC/DC module, and the first DC/DC module is used for transmitting second direct current generated by the photovoltaic power generation assembly to the direct current bus;
the hydrogen energy power generation unit is used for converting hydrogen energy into third direct current;
the energy storage unit comprises an energy storage module and a second DC/DC module, and the energy storage module is used for storing and discharging electricity through the second DC/DC module;
the direct current load unit comprises a direct current load and a third DC/DC module, wherein the third DC/DC module is connected with the direct current bus and is used for converting the voltage of fourth direct current received from the direct current bus.
2. The system of claim 1, wherein the system further comprises:
and the control unit is respectively connected with the wind power generation unit, the photovoltaic power generation unit, the energy storage unit, the direct current load unit and the hydrogen energy power generation unit and is used for adjusting the working states of the wind power generation unit, the photovoltaic power generation unit, the energy storage unit, the direct current load unit and the hydrogen energy power generation unit according to the current direct current load.
3. The system according to claim 2, wherein the control unit is specifically configured to control the energy storage unit to discharge the dc bus if a sum of the generated powers of the wind power generation unit and the photovoltaic power generation unit is lower than a preset threshold value, wherein the preset threshold value is determined based on the power consumption of the dc load.
4. The system of claim 2, wherein the control unit is specifically configured to:
and when the sum of the generated power of the wind power generation unit and the photovoltaic power generation unit is greater than the preset threshold value, controlling the energy storage unit to receive fifth direct current of the direct current bus through the second DC/DC module.
5. The system of claim 2, wherein the hydrogen energy generation unit comprises a direct current hydrogen production module, a hydrogen storage module, and a fourth DC/DC module, and the control unit is specifically configured to:
under the condition that the sum of the generated power of the wind power generation unit and the photovoltaic power generation unit is larger than a preset threshold value, controlling the hydrogen energy power generation unit to receive sixth direct current from the direct current bus by using the fourth DC/DC module;
controlling the hydrogen energy power generation unit to carry out electrolysis treatment on water through the direct current hydrogen production module to prepare hydrogen;
storing the hydrogen gas to the hydrogen storage module.
6. The system of claim 2, wherein the hydrogen energy generation unit comprises a fuel cell and a fifth DC/DC module, the control unit being specifically configured to:
when the sum of the generated power of the wind power generation unit and the photovoltaic power generation unit is lower than the preset threshold value, controlling the hydrogen energy power generation unit to generate power by using the fuel cell;
and controlling the hydrogen energy power generation unit to transmit the third direct current generated by the fuel cell to the direct current bus through the fifth DC/DC module.
7. The system according to claim 2, wherein the control unit is specifically configured to control the DC load unit to perform voltage conversion on the fourth DC power received from the DC bus through the third DC/DC module after determining a voltage level corresponding to the DC load according to the power consumption of the DC load.
8. A grid autonomy method, applied to a grid autonomy system according to any one of claims 1 to 7, comprising:
acquiring first generating power output by a wind power generation unit;
acquiring second generating power output by the photovoltaic power generation unit;
and carrying out electrolytic treatment on the water under the condition that the sum of the first generating power and the second generating power is greater than a preset threshold value.
9. The method of claim 8, further comprising:
storing the hydrogen obtained by electrolyzing the water;
and generating power by using the hydrogen gas when the sum of the first generated power and the second generated power is less than the preset threshold value.
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