CN107404125B - Multi-energy complementary power distribution system and energy management method and device thereof - Google Patents
Multi-energy complementary power distribution system and energy management method and device thereof Download PDFInfo
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- 230000000295 complement effect Effects 0.000 title claims abstract description 47
- 238000007726 management method Methods 0.000 title claims abstract description 34
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 158
- 239000001257 hydrogen Substances 0.000 claims abstract description 146
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 146
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 121
- 239000003345 natural gas Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims description 46
- 239000000446 fuel Substances 0.000 claims description 17
- 230000005611 electricity Effects 0.000 claims description 8
- 238000004590 computer program Methods 0.000 claims description 5
- 238000006467 substitution reaction Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 238000010248 power generation Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 3
- 241000764238 Isis Species 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 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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- 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
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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- H02J3/387—
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Abstract
The invention relates to a multi-energy complementary power distribution system and an energy management method and device thereof, wherein the method comprises the following steps: when the output power of the intermittent distributed power supply is larger than the load power, acquiring the power grid parameters of a power distribution system connected with the intermittent distributed power supply, generating a first instruction according to the power grid parameters and a preset parameter threshold, controlling an electric-to-hydrogen device in the power distribution system to be started according to the first instruction, generating a second instruction when the output flow of hydrogen reaches an upper limit value, controlling an electric-to-methane device in the power distribution system to be started according to the second instruction, and inputting the converted methane into a natural gas network. The invention can convert the surplus energy of the intermittent distributed power supply into energy of other forms, and is beneficial to improving the running efficiency of the multi-energy complementary system.
Description
Technical Field
The invention relates to the technical field of comprehensive energy management, in particular to a multi-energy complementary power distribution system and an energy management method and device thereof.
Background
In recent years, clean renewable energy becomes a topic discussed by people, and the reasonable utilization of clean energy of intermittent distributed power sources such as photovoltaic distributed power sources becomes a research direction, wherein a regional multi-energy complementary distributed energy power distribution system containing the intermittent distributed power sources and 'gas electricity' is a typical form, and meanwhile, when the intermittent distributed power sources and 'gas electricity' are jointly operated, the operation efficiency is low due to the fact that coordination often lacks between the intermittent distributed power sources and 'gas electricity'.
Disclosure of Invention
Therefore, the energy management method and device for the multi-energy complementary power distribution system are provided, and the problem of low operation efficiency of the multi-energy complementary power distribution system is solved.
A method of energy management for a multi-energy complementary power distribution system, comprising the steps of:
when the output power of the intermittent distributed power supply is larger than the load power, acquiring the power grid parameters of a power distribution system connected with the intermittent distributed power supply;
generating a first instruction according to the power grid parameters and a preset parameter threshold value, and controlling a power-to-hydrogen device in the power distribution system to be started according to the first instruction; the electric-to-hydrogen device converts electric energy into hydrogen to be output;
and when the output flow of the hydrogen reaches a preset upper limit value, generating a second instruction, controlling an electric methane conversion device in the power distribution system to be started according to the second instruction, and inputting the converted methane into a natural gas network.
A multi-energy complementary power distribution system, comprising: the system comprises an intermittent distributed power supply, an electricity-to-hydrogen device, an electricity-to-methane device and a control terminal;
each intermittent distributed power supply, the electricity-to-hydrogen device and the electricity-to-methane device are connected with the control terminal; the electric methane conversion device is also connected with a natural gas network;
the intermittent distributed power supply is used for supplying power to a load and the power distribution system;
the electricity-to-hydrogen device is used for converting the electric energy of the intermittent distributed power supply into hydrogen; the electric methane conversion device is used for converting electric energy of the intermittent distributed power supply into methane and inputting the methane into the natural gas network;
the control terminal is used for controlling the on and off of the hydrogen electric conversion device and the methane electric conversion device and controlling the output power of the intermittent distributed power supply.
An energy management device of a multi-energy complementary power distribution system, comprising:
the power grid parameter acquisition module is used for acquiring the power grid parameters of a power distribution system connected with the intermittent distributed power supply when the output power of the intermittent distributed power supply is greater than the load power;
the power conversion hydrogen device starting module is used for generating a first instruction according to the power grid parameters and a preset parameter threshold value and controlling the power conversion hydrogen device in the power distribution system to be started according to the first instruction; the electric-to-hydrogen device converts electric energy into hydrogen to be output;
and the electric methane conversion device starting module is used for generating a second instruction when the output flow of the hydrogen reaches a set upper limit value, controlling the electric methane conversion device in the power distribution system to be started according to the second instruction, and inputting the converted methane into a natural gas network.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method when executing the program.
According to the multi-energy complementary power distribution system and the energy management method and device thereof, when the output power of the intermittent distributed power supply is greater than the load power, the power grid parameters of the power distribution system connected with the intermittent distributed power supply are obtained; generating a first instruction according to the power grid parameters and a preset parameter threshold value, and controlling a power-to-hydrogen device in the power distribution system to be started according to the first instruction; and when the output flow of the hydrogen reaches an upper limit value, generating a second instruction, controlling an electric methane conversion device in the power distribution system to be started according to the second instruction, and inputting the converted methane into a natural gas network. According to the scheme, the intermittent distributed power supply can convert the surplus energy into other forms of energy, and the running efficiency of the multi-energy complementary system is improved.
Drawings
FIG. 1 is a schematic flow diagram of a method for energy management in a multi-energy complementary power distribution system in one embodiment;
FIG. 2 is a specific schematic flow diagram of a method for energy management in a multi-energy complementary power distribution system in accordance with an embodiment;
FIG. 3 is a schematic block diagram of an energy management system of the multi-energy complementary power distribution system in one embodiment;
FIG. 4 is a schematic block diagram of a multi-energy complementation system in one embodiment.
Detailed Description
In order to further explain the technical means and effects of the present invention, the following description will be made for clear and complete descriptions of the technical solutions of the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments.
Fig. 1 is a schematic flow diagram of a method for energy management in a multi-energy complementary power distribution system in an embodiment, as shown in fig. 1, the method comprising the steps of:
s101, when the output power of the intermittent distributed power source is larger than the load power, acquiring the power grid parameters of a power distribution system connected with the intermittent distributed power source.
In this step, the definition of the intermittent distributed power supply is that the distributed power supply works for a period of time and does not work for a period of time within a certain time period; the intermittent distributed power supply of the embodiment may be a distributed photovoltaic power generation power supply or a distributed wind power generation power supply.
And S102, generating a first instruction according to the power grid parameters and a preset parameter threshold, and controlling a power-to-hydrogen device in the power distribution system to be started according to the first instruction.
In this step, the power grid parameters may be power grid voltage, power grid current, branch line current, line power of each branch, and the like, and the preset parameter threshold is designed according to specific power grid parameters.
Wherein, the electricity changes hydrogen device and changes the electric energy into hydrogen output.
And S103, when the output flow of the hydrogen reaches a set upper limit value, generating a second instruction, controlling an electric methane conversion device in the power distribution system to be started according to the second instruction, and inputting the converted methane into a natural gas network.
In this step, the second command may be a communication command or a switch command, specifically, a command capable of generating and controlling the power-to-methane device, and all technical effects of the present invention can be achieved.
In the energy management method for the multi-energy complementary power distribution system in the embodiment, when the output of the intermittent distributed power source is excessive, the excessive electric quantity is input into the power distribution system, and if the excessive electric quantity exceeds the absorption capacity of the power distribution system, the electric-to-hydrogen device and the electric-to-methane device connected with the power distribution network are selectively started, so that the excessive energy of the intermittent distributed power source is stored in other forms of energy, and the operation efficiency of the multi-energy complementary power distribution system is improved.
In an embodiment, the generating a first instruction according to the grid parameter and a preset parameter threshold includes: and if the line current is larger than the upper limit of the line current threshold value and/or when the bus voltage is larger than the upper limit of the bus voltage threshold value, generating the first instruction. The parameter condition of a bus of the power distribution system is reflected through the bus voltage of the power grid, and the power condition of each branch of the power distribution system is reflected through the line current of the power grid, so that when the bus voltage of the power distribution system is larger than the upper limit of a bus voltage threshold or the line current is larger than the upper limit of a line current threshold, the excess electric quantity of the intermittent distributed power supply is judged to exceed the upper limit value absorbed by the power distribution system, and a first instruction is generated.
In an embodiment, after controlling the electric methane conversion device in the power distribution system to be turned on according to the second instruction and inputting the converted methane into the natural gas network, the method further includes: when the pipeline flow of the natural gas network reaches the upper flow limit value, controlling the electric methane conversion device to be closed; and detecting whether the current line current value is greater than the upper limit of a line current threshold value or not, or when the bus voltage is greater than the upper limit of the bus voltage threshold value, if any detection result is yes, generating a third instruction, and controlling the intermittent distributed power supply to reduce the output power according to the third instruction. When methane is input into a natural gas network, the flow value of the natural gas network is considered, and if the flow exceeds the limit, the input of the methane should be reduced, therefore, in this embodiment, when the pipeline flow of the natural gas network reaches the upper limit of the flow, the electric methane conversion device is controlled to be turned off, so as to prevent safety accidents caused by the pipeline flow of the natural gas network exceeding the limit, and simultaneously detect whether the current line current value is greater than the upper limit of the line current threshold value, or whether the bus voltage is larger than the upper threshold limit of the bus voltage value or not, if one of the conditions is met, generating a third instruction, and controlling the intermittent distributed power supply to reduce the output power according to the third instruction, wherein at the moment, the output power of the intermittent distributed power supply is too high and exceeds the absorption capacity of the whole multi-energy complementary system, and the stability of the multi-energy complementary system is maintained by adopting a mode of reducing the output power of the intermittent distributed power supply.
In one embodiment, the energy management method of the multi-energy complementary power distribution system further comprises the steps of: storing the hydrogen output by the electricity-to-hydrogen device through a hydrogen storage device to obtain the hydrogen energy in the hydrogen storage device; and when the energy of the hydrogen in the hydrogen storage device reaches a storage upper limit value, generating a fourth instruction, and controlling the electric-to-hydrogen conversion device to be closed according to the fourth instruction. In this embodiment, the hydrogen output by the hydrogen electric conversion device is stored in the storage device, so as to realize the conversion of electric energy into chemical energy, and when the capacity of the hydrogen storage device reaches the upper limit, the hydrogen electric conversion device is turned off, so as to ensure the safety of the hydrogen storage device.
Preferably, when the line current is smaller than the upper limit of the line current threshold and the bus voltage is smaller than the upper limit of the bus voltage threshold, a fifth instruction is generated, and a hydrogen fuel cell connected with the hydrogen storage device is controlled to be started according to the fifth instruction, so that hydrogen in the hydrogen storage device is delivered to the hydrogen fuel cell to generate electricity, and electric energy generated by the hydrogen fuel cell is input into the power distribution system. In this embodiment, a scenario may occur in which when the intermittent distributed power source has no power output or the power output is insufficient, and the power supply of the power distribution system is insufficient, the hydrogen fuel cell is started, the hydrogen in the hydrogen storage device is used as fuel to generate power, and the generated power is output to the power distribution system, and when the intermittent distributed power source has insufficient output, the stability of the power distribution system is maintained, so as to further improve the operating efficiency of the multi-energy complementary system.
Further, in the above embodiment, the step of obtaining the grid parameters of the power distribution system connected to the intermittent distributed power source includes: and calculating the power flow of the power distribution system according to a forward-backward substitution method, and obtaining the power grid parameters according to the power flow. The power flow of the whole power distribution system can be obtained by adopting a forward-backward substitution method, and the power grid parameters which are obtained by thinking can be obtained according to the power flow.
With reference to the energy management method of the multi-energy complementary power distribution system of the above embodiment, the energy management method of the multi-energy complementary power distribution system of the present invention is described below with an embodiment.
Fig. 2 is a specific schematic flow chart of an energy management method of the multi-energy complementary power distribution system in an embodiment, as shown in fig. 2, in which a 24-hour operation cycle of the intermittent distributed power source is defined, the method includes the steps of:
s201, calculating the power flow of the multi-energy complementary power distribution system by adopting a forward-backward substitution method, and executing S202.
S202, the system is initialized, and j is set to 0, i is set to 0, where j represents the storage amount of the hydrogen storage device. S203 is performed.
S203 sets t to t +1, where t denotes the current time, and S204 is executed.
S204, calculating the output power of the intermittent distributed power supply at the time t of each scene
S205 is performed.
S205, judging the output power
Whether or not less than the load power
If it is
Is greater than
Then S206 is executed; if it is
Is less than
S216 is executed.
S206, judging the line current
Whether or not less than a predetermined line current threshold
If yes, go to step S207; if not, executing S208.
S207, judging the bus voltage
Whether or not it is less than the preset bus voltage threshold
If so, go to S214(ii) a If not, go to step S208.
S208, the hydrogen electrolysis/conversion apparatus is started, and S209 is executed.
S209, by formula
And calculating the hydrogen storage amount of the hydrogen storage device at the current moment. Wherein the content of the first and second substances,
indicating the hydrogen storage amount of the hydrogen storage device at the previous time, and when t is 1,
is 0, T is a 24 hour duty cycle;
for power consumption, ηele-P2HFor the energy conversion efficiency of the device for converting electricity into hydrogen,
is an equivalent electrical power;
is the power generation amount of the hydrogen fuel cell,
for hydrogen fuel electricityPool hydrogen consumption amount, ηFCThe overall conversion efficiency of the hydrogen fuel cell. In this formula. Δ t takes one hour, S210 is executed.
S210, judging whether the hydrogen storage device stores hydrogen gas fully, if so, executing S212; if not, S211 is executed.
S211, judging whether the hydrogen output by the electric hydrogen conversion device is full, namely the hydrogen output reaches the upper flow limit, if so, executing S212; if not, go to S216.
And S212, starting the electric methane conversion device, converting the surplus output power of the intermittent distributed power supply into methane, injecting the methane into a natural gas network, and executing S213.
S214, the hydrogen fuel cell is started, the hydrogen gas in the hydrogen storage device is consumed, and the converted electric energy is input into the power distribution system, and the step of S216 is executed.
S215, the output power of the intermittent distributed power source is reduced, and S216 is executed.
S216, judging whether t is smaller than 24, if yes, executing S203; if not, go to S217.
And S217, ending.
The energy management method of the multi-energy complementary power distribution system in the embodiment takes 24 hours as a working period of the intermittent distributed power supply, and realizes energy management by detecting the state of each part of the system every hour, so that the operation efficiency of the multi-energy complementary power distribution system is improved.
Based on the energy management method of the multi-energy complementary power distribution system in the above embodiment, the present invention further provides an energy management device of the multi-energy complementary power distribution system, which can be used to execute the energy management method of the multi-energy complementary power distribution system. For convenience of illustration, the structural schematic diagram of the energy management device embodiment of the multi-energy complementary power distribution system only shows the part related to the embodiment of the present invention, and those skilled in the art will understand that the illustrated structure does not constitute a limitation of the system, and may include more or less components than those illustrated, or combine some components, or arrange different components.
Fig. 3 is a schematic block diagram of an energy management device of the multi-energy complementary power distribution system in an embodiment, as shown in fig. 3, the device comprising:
the power grid parameter acquiring module 301 is configured to acquire a power grid parameter of a power distribution system connected to the intermittent distributed power source when the output power of the intermittent distributed power source is greater than the load power.
The power conversion hydrogen device starting module 302 is configured to generate a first instruction according to the power grid parameter and a preset parameter threshold, and control a power conversion hydrogen device in the power distribution system to be started according to the first instruction; wherein, the electricity changes hydrogen device and changes the electric energy into hydrogen output.
And the electric methane conversion device starting module 303 is configured to generate a second instruction when the output flow of the hydrogen reaches a set upper limit value, control the electric methane conversion device in the power distribution system to be started according to the second instruction, and input the converted methane into the natural gas network.
In an embodiment, the grid parameters include a grid bus voltage and a grid line current; the electric-to-hydrogen device starting module is further used for generating the first instruction if the line current value is larger than the line current threshold upper limit and/or when the bus voltage is larger than the bus voltage threshold upper limit.
In one embodiment, the system further comprises an output power adjusting module, which is used for controlling the electric methane conversion device to be closed when the pipeline flow of the natural gas network reaches an upper flow limit value; and detecting whether the current line current value is greater than the upper limit of a line current threshold value or whether the current bus voltage is greater than the upper limit of a bus voltage threshold value, if any detection result is yes, generating a third instruction, and controlling the intermittent distributed power supply to reduce the output power according to the third instruction.
In an embodiment, the hydrogen storage module is used for storing the hydrogen output by the hydrogen electric conversion device through a hydrogen storage device, and acquiring the energy of the hydrogen in the hydrogen storage device; and when the energy of the hydrogen in the hydrogen storage device reaches a storage upper limit value, generating a fourth instruction, and controlling the electric-to-hydrogen conversion device to be closed according to the fourth instruction.
In an embodiment, the power generation module is further configured to generate a fifth instruction when the line current value is smaller than a line current threshold upper limit and the bus voltage is smaller than a bus voltage threshold upper limit, control a hydrogen fuel cell connected to the hydrogen storage device to be turned on according to the fifth instruction, so as to deliver hydrogen in the hydrogen storage device to the hydrogen fuel cell for power generation, and input electric energy generated by the hydrogen fuel cell to the power distribution system.
In an embodiment, the power grid parameter obtaining module 301 is further configured to calculate a power flow of the power distribution system according to a push-back substitution method, and obtain the power grid parameter according to the power flow.
The energy management method based on the multi-energy complementary power distribution system also provides the multi-energy complementary power distribution system, and the multi-energy complementary power distribution system can realize the energy management method of the multi-energy complementary power distribution system.
Fig. 4 is a schematic structural diagram of a multi-energy complementation system in an embodiment, as shown in fig. 4, the system includes: the system comprises an intermittent distributed power supply, an electricity-to-hydrogen device, an electricity-to-methane device and a control terminal; the control terminal only needs to generate a control command according to the state information of each part, and therefore, the control terminal is not shown in the figure.
The intermittent distributed power supply, the electricity-to-hydrogen device and the electricity-to-methane device are all connected with the control terminal; the electric methane conversion device is also connected with a natural gas network; the intermittent distributed power supply is used for supplying power to a load and the power distribution system; the electricity-to-hydrogen device is used for converting the electric energy of the intermittent distributed power supply into hydrogen; the electric methane conversion device is used for converting electric energy of the intermittent distributed power supply into methane and inputting the methane into the natural gas network; the control terminal is used for controlling the on and off of the hydrogen electric conversion device and the methane electric conversion device and controlling the output power of the intermittent distributed power supply.
In one embodiment, the multi-energy complementary system further comprises a hydrogen fuel cell and a hydrogen storage device, wherein the hydrogen storage device is used for storing the hydrogen output by the electricity-to-hydrogen gas device; the hydrogen fuel cell is used for converting hydrogen in the hydrogen storage device into electric energy and inputting the converted electric energy into a power distribution network of a power distribution system.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware associated with computer program instructions, and the programs may be stored in a computer readable storage medium and sold or used as a stand-alone product. The program, when executed, may perform all or a portion of the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
In an embodiment, the storage medium may also be provided in a computer device, the computer device further including a processor. The processor, when executing the program in the storage medium, may perform all or a portion of the steps of the embodiments of the methods described above.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of energy management in a multi-energy complementary power distribution system, comprising the steps of:
when the output power of the intermittent distributed power supply is larger than the load power, acquiring the power grid parameters of a power distribution system connected with the intermittent distributed power supply; the power grid parameters comprise power grid voltage and power grid current;
generating a first instruction according to the power grid voltage and the power grid current in the power grid parameters and a preset parameter threshold, and controlling a hydrogen conversion device in the power distribution system to be started according to the first instruction; the electric-to-hydrogen device converts electric energy into hydrogen to be output;
when the hydrogen storage device is determined to be fully stored with hydrogen currently, starting an electricity-to-methane device in the power distribution system, and inputting methane converted by the electricity-to-methane device into a natural gas network; the hydrogen storage device is used for storing the hydrogen output by the electricity-to-hydrogen device;
and when the hydrogen storage device is determined not to be fully stored with hydrogen currently and the output flow of the hydrogen reaches a set upper limit value, generating a second instruction, controlling an electric methane conversion device in the power distribution system to be started according to the second instruction, and inputting the converted methane into a natural gas network.
2. The method of energy management of a multi-energy complementary power distribution system of claim 1, wherein the grid parameters include grid bus voltage and grid line current;
generating a first instruction according to the power grid parameter and a preset parameter threshold, wherein the generating of the first instruction comprises:
and if the line current is larger than the upper limit of the line current threshold value and/or when the bus voltage is larger than the upper limit of the bus voltage threshold value, generating the first instruction.
3. The energy management method of the multi-energy complementary power distribution system according to claim 2, wherein after controlling the electric-to-methane device in the power distribution system to be turned on according to the second instruction and inputting the converted methane into the natural gas network, the method further comprises:
when the pipeline flow of the natural gas network reaches a set flow upper limit value, controlling the electric methane conversion device to be closed;
and detecting whether the current line current value is greater than the upper limit of a line current threshold value or whether the current bus voltage is greater than the upper limit of a bus voltage threshold value, if any detection result is yes, generating a third instruction, and controlling the intermittent distributed power supply to reduce the output power according to the third instruction.
4. The method of energy management of a multi-energy complementary power distribution system of claim 2, further comprising:
storing the hydrogen output by the electricity-to-hydrogen device through a hydrogen storage device to obtain the hydrogen energy in the hydrogen storage device; and when the energy of the hydrogen in the hydrogen storage device reaches a storage upper limit value, generating a fourth instruction, and controlling the electric-to-hydrogen conversion device to be closed according to the fourth instruction.
5. The method of energy management of a multi-energy complementary power distribution system of claim 4, further comprising:
and when the line current is smaller than the upper limit of the line current threshold and the bus voltage is smaller than the upper limit of the bus voltage threshold, generating a fifth instruction, controlling a hydrogen fuel cell connected with the hydrogen storage device to be started according to the fifth instruction, so that hydrogen in the hydrogen storage device is delivered to the hydrogen fuel cell to generate electricity, and electric energy generated by the hydrogen fuel cell is input into the power distribution system.
6. The method for energy management in a multi-energy complementary power distribution system according to any one of claims 1-5, wherein the step of obtaining grid parameters of the power distribution system connected to the intermittent distributed power sources comprises:
and calculating the power flow of the power distribution system according to a forward-backward substitution method, and obtaining the power grid parameters according to the power flow.
7. A multi-energy complementary power distribution system, comprising: the system comprises an intermittent distributed power supply, an electricity-to-hydrogen device, an electricity-to-methane device, a hydrogen storage device and a control terminal;
the intermittent distributed power supply, the electricity-to-hydrogen device and the electricity-to-methane device are all connected with the control terminal; the electric methane conversion device is also connected with a natural gas network;
the intermittent distributed power supply is used for supplying power to a load and the power distribution system;
the electricity-to-hydrogen device is used for converting the electric energy of the intermittent distributed power supply into hydrogen; the electric methane conversion device is used for converting electric energy of the intermittent distributed power supply into methane and inputting the methane into the natural gas network;
the hydrogen storage device is used for storing the hydrogen output by the electricity-to-hydrogen device;
the control terminal is used for generating a first instruction according to the power grid voltage and the power grid current in the power grid parameters and a preset parameter threshold value, and controlling the hydrogen electrotransformation device to be started according to the first instruction;
the control terminal is also used for starting an electricity-to-methane device in the power distribution system and inputting the converted methane into a natural gas network when the hydrogen storage device is determined to be fully stored with hydrogen currently;
the control terminal is further used for generating a second instruction when the hydrogen storage device is determined not to be fully stored with hydrogen currently and the output flow of the hydrogen reaches a set upper limit value, controlling the electric methane conversion device to be started according to the second instruction, and inputting the converted methane into a natural gas network;
and the control terminal is also used for controlling the electric methane conversion device to be closed and controlling the output power of the intermittent distributed power supply when the pipeline flow of the natural gas network reaches a set flow upper limit value.
8. An energy management device for a multi-energy complementary power distribution system, comprising:
the power grid parameter acquisition module is used for acquiring the power grid parameters of a power distribution system connected with the intermittent distributed power supply when the output power of the intermittent distributed power supply is greater than the load power; the power grid parameters comprise power grid voltage and power grid current; the power conversion hydrogen device starting module is used for generating a first instruction according to the power grid voltage and the power grid current in the power grid parameters and a preset parameter threshold value, and controlling the power conversion hydrogen device in the power distribution system to be started according to the first instruction; the electric-to-hydrogen device converts electric energy into hydrogen to be output;
the power-to-methane device starting module is also used for starting a power-to-methane device in the power distribution system and inputting the converted methane into a natural gas network when the hydrogen storage device is determined to be fully stored with hydrogen currently; the hydrogen storage device is used for storing the hydrogen output by the electricity-to-hydrogen device;
and the electric methane conversion device starting module is used for generating a second instruction when the hydrogen storage device is determined not to be fully stored with hydrogen at present and the output flow of the hydrogen reaches a set upper limit value, controlling the electric methane conversion device in the power distribution system to be started according to the second instruction, and inputting the converted methane into a natural gas network.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 6.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of any of claims 1-6 are performed when the program is executed by the processor.
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