CN117458556A - New energy micro-grid power station operation system and method - Google Patents
New energy micro-grid power station operation system and method Download PDFInfo
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- CN117458556A CN117458556A CN202311191894.2A CN202311191894A CN117458556A CN 117458556 A CN117458556 A CN 117458556A CN 202311191894 A CN202311191894 A CN 202311191894A CN 117458556 A CN117458556 A CN 117458556A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000010248 power generation Methods 0.000 claims abstract description 130
- 238000004146 energy storage Methods 0.000 claims abstract description 116
- 238000013486 operation strategy Methods 0.000 claims abstract description 18
- 230000000151 anti-reflux effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000002269 spontaneous effect Effects 0.000 claims description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 238000012983 electrochemical energy storage Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 2
- 230000009469 supplementation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/10—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power including a supplementary source of electric power, e.g. hybrid diesel-PV energy systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/10—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power including a supplementary source of electric power, e.g. hybrid diesel-PV energy systems
- H02S10/12—Hybrid wind-PV energy systems
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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
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- 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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- 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
Abstract
The invention discloses a new energy micro-grid power station operation system and a method, wherein the operation system comprises a power generation module, an energy storage module and a control module; the hybrid micro-grid power station is formed by integrating new energy power generation, such as photovoltaic power, wind power and the like, an electrochemical energy storage system and a traditional diesel generator set; and then carrying an operation strategy, controlling the photovoltaic power generation system, the commercial power, the energy storage module and the diesel power generation system to supply power according to the priority order, realizing intelligent power distribution of the micro-grid power station, reducing the use of traditional energy sources of the diesel power generation set by furthest utilizing new energy sources such as photovoltaic and the like, ensuring the reliability of the power system, generating higher economic benefit and reducing environmental pollution.
Description
Technical Field
The invention relates to a new energy micro-grid power station, in particular to a new energy micro-grid power station operation system and a new energy micro-grid power station operation method.
Background
The solar energy, wind power generation and other renewable energy source duty ratio is gradually increased, and the distributed power supply has the advantages of small investment, environmental protection, high flexibility and the like, and the development scale is rapidly enlarged. However, the randomness and volatility of the distributed power supply are uncontrollable, and large-scale application and access also bring about great challenges and impacts to the traditional power grid.
The micro-grid is a small power generation and distribution system composed of a distributed power supply, an energy storage device, an energy conversion device, a load, a monitoring and protecting device and the like. The micro-grid realizes the grid connection problem of flexibility, large quantity and diversity of the distributed power supply. The method realizes reliable supply of various energy forms of loads, is an effective mode of the active power distribution network, and enables the traditional power grid to be transited to the intelligent power grid.
Aiming at islands or areas with unstable and high commercial power cost, the traditional power generation in the areas mainly depends on a diesel generator set to generate power, consumes fossil energy, has high power generation cost and causes pollution to the local environment.
Disclosure of Invention
The invention aims to provide a new energy micro-grid power station operation system and a new energy micro-grid power station operation method, which are used for solving the problems of unstable cost, high cost of power generation and environmental pollution in the existing islands or areas with high cost of commercial power.
In order to solve the technical problems, the invention provides a new energy micro-grid power station operation system, which comprises a power generation module, an energy storage module and a control module; the power generation module comprises a diesel power generation system and a photovoltaic power generation system for providing electric power energy; the energy storage module is respectively and electrically connected with the commercial power, the diesel power generation system, the photovoltaic power generation system and the electric load and is used for converting electric power energy provided by the commercial power, the diesel power generation system and the photovoltaic power generation system into direct current for storage and converting the direct current into alternating current according to control instructions to supply power for the electric load; the control module comprises a diesel generation and commercial power switching control system and an EMS energy management system; the diesel generation and commercial power switching control system is respectively and electrically connected with the electric energy output ends of the commercial power and diesel power generation system and is used for controlling switching of commercial power supply and diesel power generation system supply; the EMS energy management system is respectively connected with the diesel generation and commercial power switching control system, the diesel generation system, the photovoltaic generation system and the energy storage module through signals and is used for controlling the photovoltaic generation system, the commercial power, the energy storage module and the diesel generation system to supply power according to the priority order according to the operation strategy.
The new energy micro-grid power station operation system integrates a power generation module, an energy storage module and a control module; the EMS energy management system is used as an uppermost control system and plays a role in controlling the whole micro-grid system, and is respectively and independently communicated with the diesel generation control system, the diesel generation and commercial power switching control system, the photovoltaic inverter and the hybrid inverter. And (3) operating the diesel generating set, the photovoltaic module and the energy storage battery and controlling the output power according to factors such as the system electricity load condition, the photovoltaic power generation power and the energy storage battery state. According to the EMS energy management system, the photovoltaic power generation system, the commercial power, the energy storage module and the diesel power generation system are controlled to supply power according to the carried operation strategy, intelligent power distribution of the micro-grid power station is achieved, new energy sources such as photovoltaic are utilized to the maximum extent, the use of traditional energy sources of the diesel power generation unit is reduced, accordingly, higher economic benefits are generated, and environmental pollution is reduced.
Further, the diesel power generation system comprises a diesel generator set and a diesel control system; the electric energy output end of the diesel generator set is electrically connected with the input end of the diesel and commercial power switching control system, and the diesel control system is respectively connected with the signal input end of the diesel generator set and the signal output end of the EMS energy management system. The diesel power generation system is used as a backup power source, and is used as the last power guarantee equipment of the micro-grid power station system when the photovoltaic module and the like cannot normally work to output electric energy, so that the power energy is provided, the configuration capacity of the power energy needs to meet the power load capacity, and alternating current power is output.
Further, the power generation module further comprises a wind power generation system, and the wind power generation system comprises a wind power generator set and a wind power controller for converting output electric energy of the wind power generator set into 12V direct current to charge a starting storage battery of the diesel power generator set. The output electric energy of the wind power generation system of the micro-grid power station is used for charging the starting storage battery, and the electric energy of the wind power generation system is used as the electric energy of the diesel power generation system with low power consumption and the control module, so that the output electric energy of the power generation module of the micro-grid power station can be more reasonably distributed and utilized, and the maximum utilization of new energy is realized.
Further, the photovoltaic power generation system comprises a photovoltaic module and a photovoltaic inverter, wherein the photovoltaic inverter is used for converting electric energy output by the photovoltaic module into alternating current and then supplying power to an electric load or charging an energy storage module. In this application, photovoltaic power generation system is the priority power supply main part, only when photovoltaic power generation system's output can't satisfy the user demand, reuse commercial power, energy storage system and diesel power generation system carry out the power supply to utilize the photovoltaic new energy through furthest to realize pollution abatement, resources are saved.
Further, the energy storage module comprises an energy storage battery, a hybrid inverter and an anti-reflux module; the electric energy generated by the power generation module is converted into direct current by the hybrid inverter after passing through the anti-backflow module to charge the energy storage battery, and the electric energy of the energy storage battery is converted into alternating current by the hybrid inverter and then is supplied to the electric load by the anti-backflow module. The hybrid inverter mainly realizes the mutual inversion conversion of direct current and alternating current. The anti-backflow module is mainly used for enabling the electric energy of the energy storage battery to be only supplied to local loads for use, and preventing the redundant electric energy from being sent into a power grid, so that the problems of influencing the service life and the performance of the battery, damaging power grid equipment, fluctuation of power grid voltage, unstable power grid frequency and the like are caused.
Further, the photovoltaic power generation system comprises a photovoltaic module and a photovoltaic inverter, wherein the photovoltaic inverter is used for converting electric energy output by the photovoltaic module into alternating current and then supplying power to an electric load or charging an energy storage module; the energy storage module comprises an energy storage battery and a hybrid inverter which is respectively and electrically connected with the energy storage battery and the power generation module; the electric energy generated by the power generation module is converted into direct current through the hybrid inverter to charge the energy storage battery, and the electric energy of the energy storage battery is converted into alternating current through the hybrid inverter to supply power to the power utilization load; the photovoltaic inverter and the hybrid inverter are respectively connected with the photovoltaic module through a change-over switch; the change-over switch is in signal connection with the EMS energy management system, and is switched to the photovoltaic inverter when the micro-grid power station is connected with the mains supply; when no mains supply is connected, the change-over switch is switched to the hybrid inverter. Through setting up change over switch, when no mains supply is connected, directly connect into hybrid inverter with the photovoltaic output, reducible energy conversion loss improves energy utilization.
The diesel generating set, the energy storage battery and the photovoltaic power are generally configured as follows: the power of the diesel generator set is configured according to the maximum load of the system, the photovoltaic configuration power is smaller than or equal to the power of the diesel generator set, the energy storage battery is configured according to the important load power, and 20% of the power of the diesel generator set is generally configured from the economical point of view.
In addition, the invention also provides an operation method of the new energy micro-grid power station operation system, which comprises the step of supplying power to the power utilization load (wherein the power utilization load comprises an important load and a general load, and the division of the important load and the general load can be set according to the needs of a user) according to the operation strategies of the photovoltaic power generation system, the commercial power, the energy storage battery and the diesel power generation system in sequence according to the priority order. Under the condition of photovoltaic power generation, the power load of the micro-grid power station system is mainly powered by the power generation of the photovoltaic component, and when the output power of the photovoltaic power generation system cannot meet the use requirement, the power load is preferably supplemented by the commercial power under the condition of the commercial power; when no commercial power is supplied, the energy storage system performs discharging supplementation, when the energy storage battery discharges to the minimum limit value and no electric power such as commercial power, photovoltaic power generation and the like is input, the diesel generator set is started to supply power for the whole system, and when the power consumption of the system is ensured, the energy storage battery is charged at the same time, so that the energy storage battery maintains a full-charge state.
Further, the operation strategy specifically includes:
under the state of commercial power: the EMS energy management system is used for controlling the diesel generation and mains supply switching control system to switch to a mains supply state, and the energy storage system operates in a spontaneous self-use mode; at the moment, if the output power of the photovoltaic module is sufficient, the change-over switch is controlled to be switched to the photovoltaic inverter through the EMS energy management system, and the system is powered by the photovoltaic power generation system preferentially; if the output power of the photovoltaic module is insufficient, the change-over switch is controlled to be switched to the hybrid inverter by the EMS energy management system, and the energy storage battery is used for supplying power; if the output power of the photovoltaic module and the power supply capacity of the energy storage battery are insufficient, power is supplied through the mains supply.
Further, the operation strategy specifically includes:
when the mains supply is suddenly disconnected: the EMS energy management system is used for controlling the diesel generation and commercial power switching control system to keep a commercial power state, the energy storage module operates in a battery priority mode, the energy storage battery discharges to supply power to important loads of the system, the important load power is kept uninterrupted, and the power supply to the general loads is stopped; meanwhile, the change-over switch is controlled by the EMS energy management system to be switched to the hybrid inverter, direct current of the photovoltaic module is connected into the hybrid inverter for direct current coupling, and alternating current is output after inversion; when the output power of the photovoltaic module is larger than the power consumption power of the power consumption load, the redundant power charges an energy storage battery, and the hybrid inverter limits the photovoltaic output after the energy storage battery is full; when the output power of the photovoltaic module is smaller than the power consumption power of the power consumption load, the photovoltaic module and the energy storage battery supply power together until the commercial power is recovered or the electric quantity of the energy storage battery is lower than the limit value.
Further, the operation strategy specifically includes:
when no commercial power is continuously supplied and the electric quantity of the energy storage battery is lower than the limit value: the diesel generation and commercial power switching control system is controlled by the EMS energy management system to be switched into a diesel generation state; starting a diesel power generation system by using the EMS energy management system, and after the load stably operates, re-feeding the energy storage module into the line, wherein the diesel power generation system charges the energy storage battery; the change-over switch is switched to the photovoltaic inverter, the photovoltaic module outputs the maximum power by using the voltage source provided by the diesel power generation system to provide electric energy, the output power of the diesel power generation system is gradually reduced to the lowest running power (for example, 10 percent of the rated power of the diesel power generation system is set) along with the increase of the output power of the photovoltaic module until the electricity consumption of the electricity consumption load is changed into electricity generation and bearing of the photovoltaic module; when the electric quantity of the energy storage battery reaches the upper limit value of charging, if the commercial power is not recovered, the EMS energy management system performs diesel power generation shutdown and switching of the photovoltaic inverter according to the power load condition; such as: when the power load is smaller than a set value (the set output power limit value of the hybrid inverter), the diesel generator set is shut down, and the energy storage module supplies power; when the power load is larger than a set value (the output power limit value of the hybrid inverter), the diesel power generation system is maintained to operate at the lowest operating power according to the output power condition of the photovoltaic module. And returning the system to the state of the commercial power until the commercial power is recovered.
The beneficial effects of the invention are as follows: carrying out system integration on new energy power generation such as photovoltaic, wind power and the like, an electrochemical energy storage system and a traditional diesel generator set to form a hybrid micro-grid power station; and then carrying out an operation strategy to realize intelligent power distribution of the micro-grid power station, and reducing the use of traditional energy sources of the diesel generator set by utilizing new energy sources such as photovoltaic to the maximum extent, so that the reliability of an electric power system can be ensured, higher economic benefits can be generated, and environmental pollution is reduced.
Drawings
The accompanying drawings, where like reference numerals refer to identical or similar parts throughout the several views and which are included to provide a further understanding of the present application, are included to illustrate and explain illustrative examples of the present application and do not constitute a limitation on the present application. In the drawings:
FIG. 1 is a schematic diagram of an operating system of one embodiment of the present invention.
Detailed Description
The new energy micro-grid power station operation system shown in fig. 1 comprises a power generation module, an energy storage module and a control module; the power generation module comprises a diesel power generation system and a photovoltaic power generation system for providing electric power energy; the energy storage module is respectively and electrically connected with the commercial power, the diesel power generation system, the photovoltaic power generation system and the electric load and is used for converting electric power energy provided by the commercial power, the diesel power generation system and the photovoltaic power generation system into direct current for storage and converting the direct current into alternating current according to control instructions to supply power for the electric load; the control module comprises a diesel generation and commercial power switching control system and an EMS energy management system; the diesel generation and commercial power switching control system is respectively and electrically connected with the electric energy output ends of the commercial power and diesel power generation system and is used for controlling switching of commercial power supply and diesel power generation system supply; the EMS energy management system is respectively connected with the diesel generation and commercial power switching control system, the diesel generation system, the photovoltaic generation system and the energy storage module through signals and is used for controlling the photovoltaic generation system, the commercial power, the energy storage module and the diesel generation system to supply power according to the priority order according to the operation strategy.
The new energy micro-grid power station operation system integrates a power generation module, an energy storage module and a control module; the EMS energy management system is used as an uppermost control system and plays a role in controlling the whole micro-grid system, and is respectively and independently communicated with the diesel generation control system, the diesel generation and commercial power switching control system, the photovoltaic inverter and the hybrid inverter. And (3) operating the diesel generating set, the photovoltaic module and the energy storage battery and controlling the output power according to factors such as the system electricity load condition, the photovoltaic power generation power and the energy storage battery state. According to the EMS energy management system, the photovoltaic power generation system, the commercial power, the energy storage module and the diesel power generation system are controlled to supply power according to the carried operation strategy, intelligent power distribution of the micro-grid power station is achieved, new energy sources such as photovoltaic are utilized to the maximum extent, the use of traditional energy sources of the diesel power generation unit is reduced, accordingly, higher economic benefits are generated, and environmental pollution is reduced.
According to one embodiment of the application, a diesel power generation system comprises a diesel generator set and a diesel generation control system; the electric energy output end of the diesel generator set is electrically connected with the input end of the diesel and commercial power switching control system, and the diesel control system is respectively connected with the signal input end of the diesel generator set and the signal output end of the EMS energy management system. The diesel power generation system is used as a backup power source, and is used as the last power guarantee equipment of the micro-grid power station system when the photovoltaic module and the like cannot normally work to output electric energy, so that the power energy is provided, the configuration capacity of the power energy needs to meet the power load capacity, and alternating current power is output.
According to one embodiment of the application, the power generation module further comprises a wind power generation system, wherein the wind power generation system comprises a wind power generator set and a wind power controller for converting output electric energy of the wind power generator set into 12V direct current to charge a starting storage battery of the diesel power generator set. The output electric energy of the wind power generation system of the micro-grid power station is used for charging the starting storage battery, and the electric energy of the wind power generation system is used as the electric energy of the diesel power generation system with low power consumption and the control module, so that the output electric energy of the power generation module of the micro-grid power station can be more reasonably distributed and utilized, and the maximum utilization of new energy is realized.
According to one embodiment of the application, a photovoltaic power generation system comprises a photovoltaic module and a photovoltaic inverter, wherein the photovoltaic inverter is used for supplying power to an electric load or charging an energy storage module after converting electric energy output by the photovoltaic module into alternating current. In this application, photovoltaic power generation system is the priority power supply main part, only when photovoltaic power generation system's output can't satisfy the user demand, reuse commercial power, energy storage system and diesel power generation system carry out the power supply to utilize the photovoltaic new energy through furthest to realize pollution abatement, resources are saved.
According to one embodiment of the application, the energy storage module comprises an energy storage battery, a hybrid inverter and an anti-reflux module; the electric energy generated by the power generation module is converted into direct current by the hybrid inverter after passing through the anti-backflow module to charge the energy storage battery, and the electric energy of the energy storage battery is converted into alternating current by the hybrid inverter and then is supplied to the electric load by the anti-backflow module. The hybrid inverter mainly realizes the mutual inversion conversion of direct current and alternating current. The anti-backflow module is mainly used for enabling the electric energy of the energy storage battery to be only supplied to local loads for use, and preventing the redundant electric energy from being sent into a power grid, so that the problems of influencing the service life and the performance of the battery, damaging power grid equipment, fluctuation of power grid voltage, unstable power grid frequency and the like are caused.
According to one embodiment of the application, the photovoltaic power generation system comprises a photovoltaic module and a photovoltaic inverter, wherein the photovoltaic inverter is used for converting electric energy output by the photovoltaic module into alternating current and then supplying power to an electric load or charging an energy storage module; the energy storage module comprises an energy storage battery and a hybrid inverter which is respectively and electrically connected with the energy storage battery and the power generation module; the electric energy generated by the power generation module is converted into direct current through the hybrid inverter to charge the energy storage battery, and the electric energy of the energy storage battery is converted into alternating current through the hybrid inverter to supply power to the power utilization load; the photovoltaic inverter and the hybrid inverter are respectively connected with the photovoltaic module through a change-over switch; the change-over switch is in signal connection with the EMS energy management system, and is switched to the photovoltaic inverter when the micro-grid power station is connected with the mains supply; when no mains supply is connected, the change-over switch is switched to the hybrid inverter. Through setting up change over switch, when no mains supply is connected, directly connect into hybrid inverter with the photovoltaic output, reducible energy conversion loss improves energy utilization.
The diesel generating set, the energy storage battery and the photovoltaic power are generally configured as follows: the power of the diesel generator set is configured according to the maximum load of the system, the photovoltaic configuration power is smaller than or equal to the power of the diesel generator set, the energy storage battery is configured according to the important load power, and 20% of the power of the diesel generator set is generally configured from the economical point of view.
In addition, the invention also provides an operation method of the new energy micro-grid power station operation system, which comprises the step of supplying power to the power utilization load (wherein the power utilization load comprises an important load and a general load, and the division of the important load and the general load can be set according to the needs of a user) according to the operation strategies of the photovoltaic power generation system, the commercial power, the energy storage battery and the diesel power generation system in sequence according to the priority order. Under the condition of photovoltaic power generation, the power load of the micro-grid power station system is mainly powered by the power generation of the photovoltaic component, and when the output power of the photovoltaic power generation system cannot meet the use requirement, the power load is preferably supplemented by the commercial power under the condition of the commercial power; when no commercial power is supplied, the energy storage system performs discharging supplementation, when the energy storage battery discharges to the minimum limit value and no electric power such as commercial power, photovoltaic power generation and the like is input, the diesel generator set is started to supply power for the whole system, and when the power consumption of the system is ensured, the energy storage battery is charged at the same time, so that the energy storage battery maintains a full-charge state.
According to one embodiment of the present application, the operation strategy specifically includes:
under the state of commercial power: the EMS energy management system is used for controlling the diesel generation and mains supply switching control system to switch to a mains supply state, and the energy storage system operates in a spontaneous self-use mode; at the moment, if the output power of the photovoltaic module is sufficient, the change-over switch is controlled to be switched to the photovoltaic inverter through the EMS energy management system, and the system is powered by the photovoltaic power generation system preferentially; if the output power of the photovoltaic module is insufficient, the change-over switch is controlled to be switched to the hybrid inverter by the EMS energy management system, and the energy storage battery is used for supplying power; if the output power of the photovoltaic module and the power supply capacity of the energy storage battery are insufficient, power is supplied through the mains supply.
According to one embodiment of the present application, the operation strategy specifically includes:
when the mains supply is suddenly disconnected: the EMS energy management system is used for controlling the diesel generation and commercial power switching control system to keep a commercial power state, the energy storage module operates in a battery priority mode, the energy storage battery discharges to supply power to important loads of the system, the important load power is kept uninterrupted, and the power supply to the general loads is stopped; meanwhile, the EMS energy management system controls the change-over switch to be switched to the hybrid inverter, direct current of the photovoltaic module is connected into the hybrid inverter for direct current coupling, and alternating current is output after inversion; when the output power of the photovoltaic module is larger than the power consumption power of the power consumption load, the redundant power charges an energy storage battery, and the hybrid inverter limits the photovoltaic output after the energy storage battery is full; when the output power of the photovoltaic module is smaller than the power consumption power of the power consumption load, the photovoltaic module and the energy storage battery supply power together until the commercial power is recovered or the electric quantity of the energy storage battery is lower than the limit value.
According to one embodiment of the present application, the operation strategy specifically includes:
when no commercial power is continuously supplied and the electric quantity of the energy storage battery is lower than the limit value: the EMS energy management system controls the diesel generation and commercial power switching control system to switch to a diesel generation state; starting a diesel power generation system by using the EMS energy management system, and after the load stably operates, re-feeding the energy storage module into the line, wherein the diesel power generation system charges the energy storage battery; the change-over switch is switched to the photovoltaic inverter, the photovoltaic module outputs the maximum power by using the voltage source provided by the diesel power generation system to provide electric energy, the output power of the diesel power generation system is gradually reduced to the lowest running power (for example, 10 percent of the rated power of the diesel power generation system is set) along with the increase of the output power of the photovoltaic module until the electricity consumption of the electricity consumption load is changed into electricity generation and bearing of the photovoltaic module; when the electric quantity of the energy storage battery reaches the upper limit value of charging, if the commercial power is not recovered, the EMS energy management system performs diesel power generation shutdown and switching of the photovoltaic inverter according to the power load condition; such as: when the power load is smaller than a set value (the set output power limit value of the hybrid inverter), the diesel generator set is shut down, and the energy storage module supplies power; when the power load is larger than a set value (the output power limit value of the hybrid inverter), the diesel power generation system is maintained to operate at the lowest operating power according to the output power condition of the photovoltaic module. And returning the system to the state of the commercial power until the commercial power is recovered.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (10)
1. The new energy micro-grid power station operation system is characterized by comprising a power generation module, an energy storage module and a control module;
the power generation module comprises a diesel power generation system and a photovoltaic power generation system for providing electric power energy;
the energy storage module is respectively and electrically connected with the commercial power, the diesel power generation system, the photovoltaic power generation system and the electric load, and is used for converting electric power energy provided by the commercial power, the diesel power generation system and the photovoltaic power generation system into direct current for storage and converting the direct current into alternating current according to a control instruction to supply power for the electric load;
the control module comprises a diesel generation and commercial power switching control system and an EMS energy management system; the diesel generation and commercial power switching control system is respectively and electrically connected with the electric energy output ends of the commercial power and diesel power generation system and is used for controlling switching of commercial power supply and diesel power generation system supply; the EMS energy management system is respectively connected with the diesel generation and commercial power switching control system, the diesel generation system, the photovoltaic generation system and the energy storage module through signals and is used for controlling the photovoltaic generation system, the commercial power, the energy storage module and the diesel generation system to supply power according to the priority order according to the operation strategy.
2. The new energy microgrid power station operation system according to claim 1, wherein said diesel power generation system comprises a diesel generator set and a diesel generation control system; the electric energy output end of the diesel generator set is electrically connected with the input end of the diesel and commercial power switching control system, and the diesel control system is respectively connected with the signal input end of the diesel generator set and the signal output end of the EMS energy management system.
3. The new energy microgrid power station operation system according to claim 2, wherein said power generation module further comprises a wind power generation system comprising a wind power generator set and a wind power controller for converting output electric energy of the wind power generator set into direct current to charge a start-up battery of the diesel power generator set.
4. The new energy microgrid power station operation system according to claim 1, wherein the photovoltaic power generation system comprises a photovoltaic module and a photovoltaic inverter, wherein the photovoltaic inverter is used for converting electric energy output by the photovoltaic module into alternating current and then supplying power to an electric load or charging an energy storage module; the photovoltaic inverter is in signal connection with the EMS energy management system.
5. The new energy microgrid power station operation system according to claim 1, wherein said energy storage module comprises an energy storage battery, a hybrid inverter and an anti-reflux module; the power generated by the power generation module is converted into direct current by the hybrid inverter after passing through the anti-countercurrent module to charge the energy storage battery, the power of the energy storage battery is converted into alternating current by the hybrid inverter and then is supplied to the power utilization load by the anti-countercurrent module, and the hybrid inverter is in signal connection with the EMS energy management system.
6. The new energy microgrid power station operation system according to claim 1, wherein the photovoltaic power generation system comprises a photovoltaic module and a photovoltaic inverter, wherein the photovoltaic inverter is used for converting electric energy output by the photovoltaic module into alternating current and then supplying power to an electric load or charging an energy storage module; the energy storage module comprises an energy storage battery and a hybrid inverter which is respectively and electrically connected with the energy storage battery and the power generation module; the electric energy generated by the power generation module is converted into direct current through the hybrid inverter to charge the energy storage battery, and the electric energy of the energy storage battery is converted into alternating current through the hybrid inverter to supply power to the power utilization load; the photovoltaic inverter and the hybrid inverter are respectively connected with the photovoltaic module through a change-over switch; the change-over switch is in signal connection with the EMS energy management system, and when the micro-grid power station is connected with the mains supply, the change-over switch is switched to the photovoltaic inverter; when no mains supply is connected, the change-over switch is switched to the hybrid inverter.
7. An operation method of the new energy micro-grid power station operation system according to any one of claims 1-6, which is characterized by comprising the step of supplying power to an electric load according to operation strategies of a photovoltaic power generation system, a commercial power, an energy storage battery and a diesel power generation system in sequence according to a priority order.
8. The method of operation of claim 7, wherein the operation strategy specifically comprises:
under the state of commercial power: the diesel generation and mains supply switching control system is switched into a mains supply state, and the energy storage system operates in a spontaneous self-use mode; at this time, if the output power of the photovoltaic module is sufficient, the change-over switch is switched to the photovoltaic inverter, and the system is powered by the photovoltaic power generation system preferentially; if the output power of the photovoltaic module is insufficient, the change-over switch is switched to the hybrid inverter, and the power is supplied through the energy storage battery; if the output power of the photovoltaic module and the power supply capacity of the energy storage battery are insufficient, power is supplied through the mains supply.
9. The method of operation of claim 7, wherein the electrical loads include critical loads and general loads, and wherein the operating strategy specifically comprises:
when the mains supply is suddenly disconnected: the diesel generation and commercial power switching control system is switched into a commercial power state, the energy storage module operates in a battery priority mode, the energy storage battery discharges to supply power to important loads of the system, and the power of the important loads is kept uninterrupted; simultaneously, a change-over switch is switched to a hybrid inverter, direct current of the photovoltaic module is connected to the hybrid inverter for direct current coupling, and alternating current is output after inversion; when the output power of the photovoltaic module is larger than the power consumption power of the power consumption load, the redundant power charges an energy storage battery, and the hybrid inverter limits the photovoltaic output after the energy storage battery is full; when the output power of the photovoltaic module is smaller than the power consumption power of the power consumption load, the photovoltaic module and the energy storage battery supply power together until the commercial power is recovered or the electric quantity of the energy storage battery is lower than the limit value.
10. The method of operation of claim 7, wherein the operation strategy specifically comprises:
when no commercial power is continuously supplied and the electric quantity of the energy storage battery is lower than the limit value: the diesel generation and commercial power switching control system is switched to a diesel generation state; starting a diesel power generation system by using the EMS energy management system, and after the load stably operates, re-feeding the energy storage module into the line, wherein the diesel power generation system charges the energy storage battery; the change-over switch is switched to the photovoltaic inverter, the photovoltaic module outputs the maximum power by using a voltage source provided by the diesel power generation system to provide electric energy, and the output power of the diesel power generation system is gradually reduced to the lowest running power along with the increase of the output power of the photovoltaic until an electric load is mainly born by photovoltaic power generation; when the electric quantity of the energy storage battery reaches the upper limit value of charging, if the commercial power is not recovered, the EMS energy management system performs diesel power generation shutdown and switching of the photovoltaic inverter according to the power load condition; and returning the system to the state of the commercial power until the commercial power is recovered.
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