CN114374230A - Collaborative optimization system of wind-solar energy storage micro-grid - Google Patents
Collaborative optimization system of wind-solar energy storage micro-grid Download PDFInfo
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- 238000005457 optimization Methods 0.000 title claims abstract description 13
- 230000005611 electricity Effects 0.000 claims abstract description 38
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- 238000001514 detection method Methods 0.000 claims description 21
- 230000002457 bidirectional effect Effects 0.000 claims description 15
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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
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0075—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source according to economic or energy efficiency considerations, e.g. economic dispatch
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
-
- 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
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy
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- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention provides a collaborative optimization system of a wind-solar energy storage micro-grid, which comprises the wind-solar energy storage micro-grid, a wind-solar energy storage micro-grid and a wind-solar energy storage micro-grid, wherein the wind-solar energy storage micro-grid comprises a distributed wind power generation energy storage network and a distributed photovoltaic power generation energy storage network; the electricity price acquisition module is used for acquiring the real-time electricity price of the power grid and sending the real-time electricity price information to the main control module; the main control module controls the wind-solar storage micro-grid to charge and discharge the commercial power according to the real-time electricity price information; and the reverse power protection device is used for maintaining the operation of the wind-solar energy storage micro-grid when the mains supply is powered off. The invention effectively prevents the occurrence of power supply interruption caused by the reverse power protection shutdown of the generator set caused by the wind-solar energy storage micro-grid at the load side; the energy-saving and environment-friendly power supply system has the advantages that the energy is saved, the resources are effectively utilized, the waste of manpower is reduced, and the power supply system can achieve a good using effect in the power supply process. The wind-solar energy storage micro-grid is reasonably utilized as a distributed energy storage unit, and the peak clipping and valley filling cost of the power grid is effectively reduced.
Description
Technical Field
The invention relates to the technical field of new energy, in particular to a collaborative optimization system of a wind-solar energy storage micro-grid.
Background
With the continuous emergence of the national policy of energy conservation and environmental protection, novel energy sources such as solar energy, wind energy and the like are used as renewable, clean and pollution-free energy sources, and the application range of the novel energy sources is wider and wider. But the small-sized grid-connected new energy cannot independently supply power under the condition of mains supply outage.
At present, the demand of people for power supply is higher and higher, and the stability of power supply is always a concern of customers while the quality of power supply is guaranteed. Therefore, the reliability of power supply becomes an important index for measuring the service quality of the power supply enterprise. When the commercial power is cut off, the wind-solar energy storage micro-grid such as a photovoltaic power station and a hydropower station stops working, residents have power failure, and at the moment, an emergency power supply vehicle is needed to supply power. After the emergency power supply vehicle is used as a power supply, the wind and light storage micro-grid such as a photovoltaic power station and a hydropower station starts to work again. At the moment, if the power generation power of the wind-solar energy storage micro-grid is larger than the actual use power, the generator set on the emergency power supply vehicle can be used as a motor, so that the generator set is shut down in a reverse power protection mode, the wind-solar energy storage micro-grid stops working again after the wind-solar energy storage micro-grid is shut down and powered off again, and the load is powered off again.
At present, all wind-solar energy storage micro-grids are completely closed before the emergency power supply vehicle is used, and then the wind-solar energy storage micro-grids are put into use after the commercial power is recovered. This type of handling results in wasted labor and resources.
Disclosure of Invention
The invention solves the problem of resource waste caused by the complete closing of the wind-solar energy storage micro-grid when the mains supply is powered off, provides the cooperative optimization system of the wind-solar energy storage micro-grid, and effectively prevents the occurrence of power supply interruption caused by the reverse power protection shutdown of a generator set due to the wind-solar energy storage micro-grid at the load side; the energy-saving and environment-friendly power supply system has the advantages that the energy is saved, the resources are effectively utilized, the waste of manpower is reduced, and the power supply system can achieve a good using effect in the power supply process. The wind and light storage micro-grid is reasonably utilized as a distributed energy storage unit, and the peak clipping and valley filling cost of the power grid is effectively reduced.
In order to realize the purpose, the following technical scheme is provided:
a collaborative optimization system of a wind-solar-storage microgrid comprises:
the wind-solar energy storage micro-grid comprises a distributed wind power generation energy storage grid and a distributed photovoltaic power generation energy storage grid;
the electricity price acquisition module is used for acquiring the real-time electricity price of the power grid and sending the real-time electricity price information to the main control module;
the main control module controls the wind-solar storage micro-grid to charge and discharge the commercial power according to the real-time electricity price information;
and the reverse power protection device is used for maintaining the operation of the wind-solar energy storage micro-grid when the mains supply is powered off.
The reverse power protection device can effectively prevent the occurrence of power supply interruption caused by the reverse power protection shutdown of the generator set due to the wind-solar energy storage micro-grid at the load side in the whole power supply process; the energy-saving and environment-friendly power supply system has the advantages of saving energy, effectively utilizing resources, reducing the waste of manpower and achieving good use effect in the power supply process. The invention utilizes the real-time electricity price acquired by the electricity price acquisition module to participate in the charge and discharge regulation and control of the wind and light storage micro-grid, reasonably utilizes the wind and light storage micro-grid as a distributed energy storage unit, and effectively reduces the peak clipping and valley filling cost of the power grid.
Preferably, the wind-solar energy storage micro-grid, the commercial power and the load are electrically connected, when the commercial power is cut off, the reverse power protection device is electrically connected with the generator through the unit output circuit breaker, and the reverse power protection device, the wind-solar energy storage micro-grid and the commercial power are in power supply connection with the load.
The wind-solar energy storage micro-grid, the commercial power and the load are respectively and electrically connected with the reverse power protection device, and the reverse power protection device is used for collecting the power generation power of the wind-solar energy storage micro-grid and the commercial power and the power consumption of the load. The reverse power protection device, the wind-solar energy storage micro-grid and the commercial power are connected with the load in a power supply mode, the generator set can supply power to the load through the reverse power protection device, and meanwhile the wind-solar energy storage micro-grid and the commercial power can supply power to the load. When the reverse power protection device acquires that the power of the mains supply is 0, the mains supply is powered off at the moment, the wind-solar energy storage micro-grid stops supplying power due to the fact that the mains supply is powered off, the reverse power protection device closes the generator set output circuit breaker to start the generator set, the generator set serves as a standby power supply at the moment, the wind-solar energy storage micro-grid starts working step by step, when the reverse power protection device detects that the power generation power of the wind-solar energy storage micro-grid is smaller than the consumed power of a load, the generator set continuously supplies power and stores a part of power in the reverse power protection device, and the wind-solar energy storage micro-grid detects that the power supply can continuously supply power; when the reverse power protection device detects that the power generation power of the wind-solar energy storage micro-grid is larger than the power consumption of the load, the reverse power protection device disconnects the generator set output circuit breaker and closes the generator set, and at the moment, the reverse power protection device serves as a temporary power supply and is detected by the wind-solar energy storage micro-grid so as to continuously supply power; and after the generated power of the wind-solar energy storage micro-grid is gradually reduced and is smaller than the consumed power of the load, the reverse power protection device is used as a temporary power supply to supply power, when the condition that the electric energy stored by the reverse power protection device is insufficient is detected, the reverse power protection device starts the generator set, an output circuit breaker of the generator set is closed, and the generator set is used as the temporary power supply to supply power. The invention can effectively prevent the occurrence of power supply interruption caused by the reverse power protection shutdown of the generator set caused by the wind-solar energy storage micro-grid at the load side in the whole power supply process; and energy-saving and environment-friendly, effectively utilizes resources and reduces the waste of manpower. The invention can obtain good use effect in the power supply process.
Preferably, the reverse power protection device includes:
the control unit is electrically connected with the detection unit and the bidirectional converter, and is electrically connected with the generator set and the generator set output breaker;
one end of the unit output circuit breaker and one end of the bidirectional converter are connected in parallel to the detection unit, and the detection unit is electrically connected with the wind-solar energy storage micro-grid, the commercial power and the load;
and the other end of the bidirectional converter is electrically connected with an energy storage unit.
When the mains supply is powered off, when the detection unit collects that the mains supply power is 0, the wind and light storage micro-grid stops supplying power due to the fact that the mains supply is powered off, the control unit closes the generator set output circuit breaker to start the generator set, the generator set serves as a standby power supply at the moment, and the wind and light storage micro-grid starts working step by step;
the detection unit collects the power generation power of the wind-solar energy storage micro-grid, the commercial power and the consumed power of the load, when the reverse power protection device detects that the power generation power of the wind-solar energy storage micro-grid is smaller than the consumed power of the load, the generator set continuously supplies power and charges the energy storage unit through the bidirectional converter, a part of electricity is stored in the reverse power protection device, and the wind-solar energy storage micro-grid detects that the power supply can continuously supply power;
when the detection unit detects that the power generation power of the wind-solar energy storage micro-grid is larger than the power consumption of the load, the control unit disconnects the generator set output circuit breaker and closes the generator set, and at the moment, the energy storage unit is used as a temporary power supply and is detected by the wind-solar energy storage micro-grid so as to continuously supply power;
after that, if the power generation power of the wind-solar energy storage micro-grid is gradually reduced and is smaller than the power consumption of the load, the energy storage unit serves as a temporary power supply to supply power to the load, when the detection unit detects that the electric energy of the energy storage unit is insufficient, the control unit starts the generator set, an output circuit breaker of the generator set is closed, and the generator set serves as the temporary power supply to supply power.
Preferably, the main control module controls the wind-solar energy storage micro-grid to charge and discharge the commercial power according to the real-time electricity price information, and the specific steps are as follows:
s1, acquiring a real-time electricity price a, judging whether the real-time electricity price a is smaller than or equal to a first threshold value b, if not, entering S2, if so, supplying power to a load by mains supply, judging whether the electric energy stored in the wind and light storage micro-grid is larger than or equal to c% of the total capacity, if so, not operating, and if not, charging the wind and light storage micro-grid by the mains supply until the electric energy stored in the wind and light storage micro-grid reaches d% of the total capacity;
s2, judging whether the electric energy stored in the wind and light storage micro-grid is larger than or equal to e% of the total capacity, if so, supplying power to the load by the wind and light storage micro-grid, and if not, entering S3;
s3, judging whether the real-time electricity price a is smaller than or equal to a first threshold value f, if so, supplying power to the load by the commercial power, and if not, entering S4;
s4, judging whether the electric energy stored in the wind and light storage micro-grid is larger than or equal to g% of the total capacity, if so, supplying power to the load by the wind and light storage micro-grid, and if not, supplying power to the load by commercial power;
wherein the numerical relationship is as follows: b is less than f, c% is less than d%, e% is less than c%, and g% is less than e%.
The invention sets the step of charging by using low-price electricity, and sometimes the wind-solar energy storage micro-grid is insufficient in self-power generation due to the influence of environmental factors, and when the power supply is insufficient, the electric energy for charging the wind-solar energy storage micro-grid by using the low-price electricity can be fed back to the commercial power, thereby being beneficial to reducing the cost of power grid valley filling.
Preferably, the parameters take the following values: b is 0.3, f is 0.8, c is 80, d is 90, e is 60, and g is 30.
Preferably, the detection unit comprises a switch W1, a switch W2, a switch W3, an operational amplifier Z1, an operational amplifier Z2, an operational amplifier Z3 and an operational amplifier Z4, the power signal transmitting end of the wind-solar-energy-storage microgrid is connected to the positive phase input end of the operational amplifier Z2 and the reverse phase input end of the operational amplifier Z3 through a switch W1, the power signal transmitting end of the load is connected to the reverse phase input end of the operational amplifier Z2 and the positive phase input end of the operational amplifier Z3 through a switch W2, the power signal transmitting end of the commercial power is connected to the reverse phase input end of the operational amplifier Z1, the positive phase input end of the operational amplifier Z1 is connected with a constant voltage V0, the output end of the operational amplifier Z1 is in control connection with the switch W1 and the switch W2, when the operational amplifier Z1 outputs a high level, the switch W1 and the switch W2 is turned off, when the output of the operational amplifier Z1 is at a low level, a switch W1 and a switch W2 are opened, the output end of an operational amplifier Z1 is connected to a control unit, the bidirectional converter is connected to the reverse phase input end of an operational amplifier Z4 through a switch W3, the output end of the operational amplifier Z3 is in control connection with a switch W3, when an operational amplifier Z3 outputs a high level, a switch W3 is closed, when an operational amplifier Z3 outputs a low level, a switch W3 is opened, the forward phase input end of the operational amplifier Z4 is connected with a constant voltage V1, the output end of the operational amplifier Z4 is connected to the control unit, the generator set is internally provided with a starting switch W0, the control unit is in control connection with a starting switch W0 and a generator set output breaker, when the control unit receives only 1 high level or 2 low level signals, the switch W0 and the generator set output breaker are opened, and when the control unit receives 1 low level and 1 high level, the control unit controls the switch W0 and the block output breaker to close.
The invention has the beneficial effects that: the reverse power protection device can effectively prevent the occurrence of power supply interruption caused by the reverse power protection shutdown of the generator set due to the wind-solar energy storage micro-grid at the load side in the whole power supply process; the energy-saving and environment-friendly power supply system has the advantages of saving energy, effectively utilizing resources, reducing the waste of manpower and achieving good use effect in the power supply process. The invention utilizes the real-time electricity price acquired by the electricity price acquisition module to participate in the charge and discharge regulation and control of the wind and light storage micro-grid, reasonably utilizes the wind and light storage micro-grid as a distributed energy storage unit, and effectively reduces the peak clipping and valley filling cost of the power grid.
Drawings
FIG. 1 is a system connection diagram of an embodiment;
FIG. 2 is a schematic structural diagram of a detection unit according to an embodiment.
Detailed Description
Example (b):
the embodiment provides a collaborative optimization system for a wind-solar-storage microgrid, which refers to fig. 1, and includes:
the wind-solar energy storage micro-grid comprises a distributed wind power generation energy storage grid and a distributed photovoltaic power generation energy storage grid;
the electricity price acquisition module is used for acquiring the real-time electricity price of the power grid and sending the real-time electricity price information to the main control module;
the main control module controls the wind-solar storage micro-grid to charge and discharge the commercial power according to the real-time electricity price information;
and the reverse power protection device is used for maintaining the operation of the wind-solar energy storage micro-grid when the mains supply is powered off.
The wind-solar energy storage micro-grid, the commercial power and the load are electrically connected, when the commercial power is cut off, the reverse power protection device is electrically connected with the generator through the unit output circuit breaker, and the reverse power protection device, the wind-solar energy storage micro-grid and the commercial power are in power supply connection with the load. The reverse power protection device includes:
the control unit is electrically connected with the detection unit and the bidirectional converter, and is electrically connected with the generator set and the generator set output circuit breaker;
one end of the unit output circuit breaker and one end of the bidirectional converter are connected in parallel to the detection unit, and the detection unit is electrically connected with the wind-solar energy storage micro-grid, the commercial power and the load;
and the other end of the bidirectional converter is electrically connected with an energy storage unit.
The main control module controls the wind-solar storage micro-grid to charge and discharge the commercial power according to the real-time electricity price information, and the specific steps are as follows:
s1, acquiring a real-time electricity price a, judging whether the real-time electricity price a is smaller than or equal to a first threshold value b, if not, entering S2, if so, supplying power to a load by mains supply, judging whether the electric energy stored in the wind and light storage micro-grid is larger than or equal to c% of the total capacity, if so, not operating, and if not, charging the wind and light storage micro-grid by the mains supply until the electric energy stored in the wind and light storage micro-grid reaches d% of the total capacity;
s2, judging whether the electric energy stored in the wind and light storage micro-grid is larger than or equal to e% of the total capacity, if so, supplying power to the load by the wind and light storage micro-grid, and if not, entering S3;
s3, judging whether the real-time electricity price a is smaller than or equal to a first threshold value f, if so, supplying power to the load by the commercial power, and if not, entering S4;
s4, judging whether the electric energy stored in the wind and light storage micro-grid is larger than or equal to g% of the total capacity, if so, supplying power to the load by the wind and light storage micro-grid, and if not, supplying power to the load by commercial power;
wherein the numerical relationship is as follows: b is less than f, c% is less than d%, e% is less than c%, and g% is less than e%. The parameters of this embodiment take the following values: b is 0.2, f is 0.7, c is 75, d is 95, e is 55, and g is 25.
The wind-solar energy storage micro-grid, the commercial power and the load are respectively and electrically connected with the reverse power protection device, and the reverse power protection device is used for collecting the power generation power of the wind-solar energy storage micro-grid and the commercial power and the power consumption of the load. The reverse power protection device, the wind-solar energy storage micro-grid and the commercial power are connected with the load in a power supply mode, the generator set can supply power to the load through the reverse power protection device, and meanwhile the wind-solar energy storage micro-grid and the commercial power can supply power to the load. When the reverse power protection device acquires that the power of the mains supply is 0, the mains supply is powered off at the moment, the wind-solar energy storage micro-grid stops supplying power due to the fact that the mains supply is powered off, the reverse power protection device closes the generator set output circuit breaker to start the generator set, the generator set serves as a standby power supply at the moment, the wind-solar energy storage micro-grid starts working step by step, when the reverse power protection device detects that the power generation power of the wind-solar energy storage micro-grid is smaller than the consumed power of a load, the generator set continuously supplies power and stores a part of power in the reverse power protection device, and the wind-solar energy storage micro-grid detects that the power supply can continuously supply power; when the reverse power protection device detects that the power generation power of the wind-solar energy storage micro-grid is larger than the power consumption of the load, the reverse power protection device disconnects the generator set output circuit breaker and closes the generator set, and at the moment, the reverse power protection device serves as a temporary power supply and is detected by the wind-solar energy storage micro-grid so as to continuously supply power; and after the generated power of the wind-solar energy storage micro-grid is gradually reduced and is smaller than the consumed power of the load, the reverse power protection device is used as a temporary power supply to supply power, when the condition that the electric energy stored by the reverse power protection device is insufficient is detected, the reverse power protection device starts the generator set, an output circuit breaker of the generator set is closed, and the generator set is used as the temporary power supply to supply power. The invention can effectively prevent the occurrence of power supply interruption caused by the reverse power protection shutdown of the generator set caused by the wind-solar energy storage micro-grid at the load side in the whole power supply process; and energy-saving and environment-friendly, effectively utilizes resources and reduces the waste of manpower. The invention can obtain good use effect in the power supply process.
When the mains supply is powered off, when the detection unit collects that the mains supply power is 0, the wind and light storage micro-grid stops supplying power due to the fact that the mains supply is powered off, the control unit closes the generator set output circuit breaker to start the generator set, the generator set serves as a standby power supply at the moment, and the wind and light storage micro-grid starts working step by step;
the detection unit collects the power generation power of the wind-solar energy storage micro-grid, the commercial power and the consumed power of the load, when the reverse power protection device detects that the power generation power of the wind-solar energy storage micro-grid is smaller than the consumed power of the load, the generator set continuously supplies power and charges the energy storage unit through the bidirectional converter, a part of electricity is stored in the reverse power protection device, and the wind-solar energy storage micro-grid detects that the power supply can continuously supply power;
when the detection unit detects that the power generation power of the wind-solar energy storage micro-grid is larger than the power consumption of the load, the control unit disconnects the generator set output circuit breaker and closes the generator set, and at the moment, the energy storage unit is used as a temporary power supply and is detected by the wind-solar energy storage micro-grid so as to continuously supply power;
after that, if the power generation power of the wind-solar energy storage micro-grid is gradually reduced and is smaller than the power consumption of the load, the energy storage unit serves as a temporary power supply to supply power to the load, when the detection unit detects that the electric energy of the energy storage unit is insufficient, the control unit starts the generator set, an output circuit breaker of the generator set is closed, and the generator set serves as the temporary power supply to supply power.
The invention sets the step of charging by using low-price electricity, and sometimes the wind-solar energy storage micro-grid is insufficient in self-power generation due to the influence of environmental factors, and when the power supply is insufficient, the electric energy for charging the wind-solar energy storage micro-grid by using the low-price electricity can be fed back to the commercial power, thereby being beneficial to reducing the cost of power grid valley filling.
Referring to fig. 2, the detection unit includes a switch W1, a switch W2, a switch W3, an operational amplifier Z1, an operational amplifier Z2, an operational amplifier Z3 and an operational amplifier Z4, a power signal output terminal of the wind-solar-storage microgrid is connected to a positive phase input terminal of the operational amplifier Z2 and a negative phase input terminal of the operational amplifier Z3 through a switch W1, a power signal output terminal of a load is connected to a negative phase input terminal of the operational amplifier Z2 and a positive phase input terminal of the operational amplifier Z3 through a switch W2, a power signal output terminal of a utility power is connected to a negative phase input terminal of the operational amplifier Z1, a constant voltage V0 is connected to the positive phase input terminal of the operational amplifier Z1, an output terminal of the operational amplifier Z1 is controllably connected to the switch W1 and the switch W2, when the operational amplifier Z1 outputs a high level, the switch W1 and the switch W2 are turned off, when an output level of the operational amplifier Z1 is low level, the switch W1 and the switch W2 are turned on, the output end of the operational amplifier Z1 is connected to the control unit, the bidirectional converter is connected to the inverting input end of the operational amplifier Z4 through a switch W3, the output end of the operational amplifier Z3 is in control connection with a switch W3, when the operational amplifier Z3 outputs high level, the switch W3 is closed, when the operational amplifier Z3 outputs low level, the switch W3 is opened, the positive phase input end of the operational amplifier Z4 is connected with a constant voltage V1, the output end of the operational amplifier Z4 is connected to the control unit, the generator set is internally provided with a starting switch W0, the control unit is in control connection with the starting switch W0 and a generator set output circuit breaker, when the control unit receives only 1 high level or 2 low level signals, the control switch W0 and the unit output breaker are opened, when the control unit receives 1 low level and 1 high level, the control unit controls switch W0 and the crew output breaker to close.
The constant voltage V0 ranges from 0.01V to 1V. The value range of the constant voltage V1 is 0.2V 3-0.3V 3, and V3 is the normal working voltage of the energy storage unit.
The working process is as follows: when the commercial power is disconnected, the control unit controls the starting switch W0 and the unit output circuit breaker to be closed, the voltage of the power signal sending end of the commercial power can be judged to be 0 and smaller than the constant voltage V0, the output end of the operational amplifier Z1 outputs high level, the switch W1 and the switch W2 are closed, and the next judgment is carried out; when the output power of the wind-solar energy-storage microgrid is greater than or equal to the actual output power of the load, namely the voltage at the power signal transmitting end of the wind-solar energy-storage microgrid is higher than the voltage at the load power signal transmitting end, the output end of the operational amplifier Z2 outputs a high level to the control unit, the output end of the operational amplifier Z3 outputs a low level, the switch W3 is opened, the control unit only receives 1 high level, the control switch W0 and the unit output breaker are opened, the control unit controls the bidirectional converter to invert at the moment, the energy storage unit discharges as a standby voltage, when the output power of the wind-solar energy-storage microgrid is smaller than the actual output power of the load, namely the voltage at the power signal transmitting end of the wind-solar energy-storage microgrid is lower than the voltage at the load power signal transmitting end, the output end of the operational amplifier Z2 outputs a low level to the control unit, the output end of the operational amplifier Z3 outputs a high level, the switch W3 is closed, at this time, the inverting input end of the operational amplifier Z4 can receive the output voltage of the energy storage unit, and judge the output voltage of the energy storage unit and the magnitude of the constant voltage V1, if the output voltage of the energy storage unit is greater than the constant voltage V1, the operational amplifier Z4 outputs a low level to the control unit, at this time, the control unit receives 2 low levels, the control unit controls the switch W0 and the unit output breaker to be opened, if the output voltage of the energy storage unit is less than the constant voltage V1, the operational amplifier Z4 outputs a high level to the control unit, at this time, the control unit receives 1 low level and 1 high level, and the control unit controls the switch W0 and the unit output breaker to be closed.
Claims (6)
1. A collaborative optimization system of a wind-solar-storage micro-grid is characterized by comprising:
the wind-solar energy storage micro-grid comprises a distributed wind power generation energy storage grid and a distributed photovoltaic power generation energy storage grid;
the electricity price acquisition module is used for acquiring the real-time electricity price of the power grid and sending the real-time electricity price information to the main control module;
the main control module controls the wind-solar storage micro-grid to charge and discharge the commercial power according to the real-time electricity price information;
and the reverse power protection device is used for maintaining the operation of the wind-solar energy storage micro-grid when the mains supply is powered off.
2. The collaborative optimization system of the wind-solar-storage microgrid according to claim 1, wherein the wind-solar-storage microgrid is electrically connected with a mains supply and a load, the reverse power protection device is electrically connected with a generator through a unit output circuit breaker when the mains supply is powered off, and the reverse power protection device, the wind-solar-storage microgrid and the mains supply are in power supply connection with the load.
3. The cooperative optimization system for the wind, photovoltaic and energy storage microgrid according to claim 1, wherein the reverse power protection device comprises:
the control unit is electrically connected with the detection unit and the bidirectional converter, and is electrically connected with the generator set and the generator set output breaker;
one end of the unit output circuit breaker and one end of the bidirectional converter are connected in parallel to the detection unit, and the detection unit is electrically connected with the wind-solar energy storage micro-grid, the commercial power and the load;
and the other end of the bidirectional converter is electrically connected with an energy storage unit.
4. The collaborative optimization system of the wind-solar-storage micro grid according to claim 1, wherein the main control module controls the wind-solar-storage micro grid to charge and discharge the commercial power according to the real-time electricity price information through the following specific steps:
s1, acquiring a real-time electricity price a, judging whether the real-time electricity price a is smaller than or equal to a first threshold value b, if not, entering S2, if so, supplying power to a load by mains supply, judging whether the electric energy stored in the wind and light storage micro-grid is larger than or equal to c% of the total capacity, if so, not operating, and if not, charging the wind and light storage micro-grid by the mains supply until the electric energy stored in the wind and light storage micro-grid reaches d% of the total capacity;
s2, judging whether the electric energy stored in the wind and light storage micro-grid is larger than or equal to e% of the total capacity, if so, supplying power to the load by the wind and light storage micro-grid, and if not, entering S3;
s3, judging whether the real-time electricity price a is smaller than or equal to a first threshold value f, if so, supplying power to the load by the commercial power, and if not, entering S4;
s4, judging whether the electric energy stored in the wind and light storage micro-grid is larger than or equal to g% of the total capacity, if so, supplying power to the load by the wind and light storage micro-grid, and if not, supplying power to the load by commercial power;
wherein the numerical relationship is as follows: b is less than f, c% is less than d%, e% is less than c%, and g% is less than e%.
5. The cooperative optimization system of the wind, photovoltaic and energy storage microgrid according to claim 4, characterized in that the parameters take the following values: b is 0.3, f is 0.8, c is 80, d is 90, e is 60, and g is 30.
6. The cooperative optimization system of the wind-solar-energy-storage microgrid according to claim 1, wherein the detection unit comprises a switch W1, a switch W2, a switch W3, an operational amplifier Z1, an operational amplifier Z2, an operational amplifier Z3 and an operational amplifier Z4, a power signal sending end of the wind-solar-energy-storage microgrid is connected to a positive phase input end of the operational amplifier Z2 and a reverse phase input end of the operational amplifier Z3 through a switch W1, a power signal sending end of the load is connected to a reverse phase input end of the operational amplifier Z2 and a positive phase input end of the operational amplifier Z3 through a switch W2, a power signal sending end of the commercial power is connected to a reverse phase input end of the operational amplifier Z1, a positive phase input end of the operational amplifier Z1 is connected with a constant voltage V0, an output end of the operational amplifier Z1 is in control connection with the switch W1 and the switch W2, and when the operational amplifier Z1 outputs high power, the switch W1 and the switch W2 are closed, when the output of the operational amplifier Z1 is low level, the switch W1 and the switch W2 are opened, the output end of the operational amplifier Z1 is connected to the control unit, the bidirectional converter is connected to the reverse phase input end of the operational amplifier Z4 through the switch W3, the output end of the operational amplifier Z3 is connected with the switch W3 in a control mode, when the operational amplifier Z3 outputs high level, the switch W3 is closed, when the operational amplifier Z3 outputs low level, the switch W3 is opened, the forward phase input end of the operational amplifier Z4 is connected with the constant voltage V1, the output end of the operational amplifier Z4 is connected to the control unit, the generator set is internally provided with the starting switch W0, the control unit is connected with the starting switch W0 and the generator set output breaker in a control mode, when the control unit receives only 1 high level or 2 low level signals, the switch W0 and the generator set output breaker are controlled to be opened, when the control unit receives 1 low level and 1 high level, the control unit controls switch W0 and the crew output breaker to close.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412594A (en) * | 2011-11-25 | 2012-04-11 | 北京金风科创风电设备有限公司 | Control Method of Microgrid System |
| CN102664429A (en) * | 2012-05-29 | 2012-09-12 | 国电联合动力技术有限公司 | Grid-connected non-networking micro-grid system and control protection method thereof |
| CN203205889U (en) * | 2013-04-08 | 2013-09-18 | 嘉兴清源电气科技有限公司 | DC (direct current) micro grid system |
| KR20140060401A (en) * | 2012-11-09 | 2014-05-20 | 한국전기연구원 | Stand-alone microgrid control system and method |
| CN103997058A (en) * | 2014-05-08 | 2014-08-20 | 东北大学 | Control method of wind, photovoltaic and storage micro grid system |
| WO2015003443A1 (en) * | 2013-07-09 | 2015-01-15 | 京东方科技集团股份有限公司 | Anti-countercurrent grid-connected photovoltaic power generation system |
| CN113541297A (en) * | 2021-06-03 | 2021-10-22 | 国网浙江省电力有限公司衢州供电公司 | New energy-based microgrid reverse power protection method and system |
-
2021
- 2021-11-10 CN CN202111326293.9A patent/CN114374230A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412594A (en) * | 2011-11-25 | 2012-04-11 | 北京金风科创风电设备有限公司 | Control Method of Microgrid System |
| CN102664429A (en) * | 2012-05-29 | 2012-09-12 | 国电联合动力技术有限公司 | Grid-connected non-networking micro-grid system and control protection method thereof |
| KR20140060401A (en) * | 2012-11-09 | 2014-05-20 | 한국전기연구원 | Stand-alone microgrid control system and method |
| CN203205889U (en) * | 2013-04-08 | 2013-09-18 | 嘉兴清源电气科技有限公司 | DC (direct current) micro grid system |
| WO2015003443A1 (en) * | 2013-07-09 | 2015-01-15 | 京东方科技集团股份有限公司 | Anti-countercurrent grid-connected photovoltaic power generation system |
| CN103997058A (en) * | 2014-05-08 | 2014-08-20 | 东北大学 | Control method of wind, photovoltaic and storage micro grid system |
| CN113541297A (en) * | 2021-06-03 | 2021-10-22 | 国网浙江省电力有限公司衢州供电公司 | New energy-based microgrid reverse power protection method and system |
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