CN112003328A - Control method and control system of micro-grid system - Google Patents
Control method and control system of micro-grid system Download PDFInfo
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- CN112003328A CN112003328A CN202010864067.5A CN202010864067A CN112003328A CN 112003328 A CN112003328 A CN 112003328A CN 202010864067 A CN202010864067 A CN 202010864067A CN 112003328 A CN112003328 A CN 112003328A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/63—Monitoring or controlling charging stations in response to network capacity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/66—Data transfer between charging stations and vehicles
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a control method and a control system of a micro-grid system, wherein the control method of the micro-grid system comprises the following steps: monitoring the running state of the micro-grid system; judging whether the micro-grid system is in an abnormal state or not according to the running state; when the micro-grid system is in an abnormal state, the charging piles in the fast charging mode are sequentially converted into the slow charging mode according to the preset power supply and load balance relation and the preset grade sequence of each charging pile in the charging pile units. The running state of the micro-grid system is monitored; according to the preset power supply and load balance relation and the preset grade sequence of each charging pile in the charging pile units, when the micro-grid system is in an abnormal state, the charging piles in a fast charging mode are sequentially converted into a slow charging mode, and accurate management of each unit is realized; the load of a power supply system of the power grid is reduced, the power consumption requirement of a user is met, the operation cost is reduced, and the safe and stable operation of each unit of the micro-grid system is guaranteed.
Description
Technical Field
The invention relates to the field of system control, in particular to a control method and a control system of a micro-grid system.
Background
With the continuous increase of the current energy demand, the energy cost restricts the survival and development of enterprises, how to use the advanced means of 'multi-energy complementation and source-network-load cooperation' to realize the benefit maximization under the premise of safe energy supply of a park, and the problems of local consumption, network loss and network-off power supply loss of a distribution line of the existing power supply; with the application of energy storage and energy in a regional power distribution network, a regional micro-grid structure comprising power supply of a power grid, regional/distributed power generation, energy storage, power distribution, power utilization and the like is gradually formed, the independent operation in the micro-grid system under the support of a power supply loop of the power grid can be met, how to ensure that each unit of the regional micro-grid can work safely and stably is realized, the accurate management of each unit is realized, and the intelligent dynamic management of the micro-grid system is gradually achieved.
Disclosure of Invention
In view of this, embodiments of the present invention provide a control method and a control system for a micro-grid system, which solve the problem that the prior art cannot implement accurate management on each unit of the micro-grid system, and gradually achieve intelligent dynamic management on the micro-grid system.
The embodiment of the invention provides a control method of a micro-grid system, wherein the micro-grid system comprises a charging pile unit, and the control method of the micro-grid system comprises the following steps: monitoring the running state of the micro-grid system; judging whether the micro-grid system is in an abnormal state or not according to the running state; and when the micro-grid system is in an abnormal state, sequentially converting the charging piles in the fast charging mode into the slow charging mode according to a preset power supply and load balance relation and a preset grade sequence of each charging pile in the charging pile units.
Optionally, when the microgrid system is in a normal operation state, the charging pile units are connected to the low-voltage distribution section of the microgrid through a distribution switching loop according to the principle of uniform load distribution.
Optionally, the microgrid system further comprises an energy storage unit and a power generation unit, and when the microgrid system is in an abnormal state, the control method of the microgrid system further comprises: monitoring whether the micro-grid system has faults in each alternating current distribution section; when any one section of alternating current distribution section breaks down, switching the charging pile units operating in the faulted alternating current distribution section to the normally operating alternating current distribution section through a distribution switching loop, and sequentially converting the charging piles in the fast charging mode into the slow charging mode according to a preset power supply and load balance relation and a preset grade sequence of each charging pile in the charging pile units; when two alternating current power distribution sections break down, the connection between the energy storage unit, the power generation unit and the charging pile unit and the two alternating current power distribution sections is cut off through a first preset switching loop, and a closed-loop operation system of the energy storage unit, the power generation unit and the charging pile unit is established through a second preset switching loop.
Optionally, the control method of the microgrid system further comprises: starting a charging mode of the energy storage unit according to preset time, and changing the charging mode of the energy storage unit into a slow charging maintenance charging mode according to the valley period duration of a power grid; monitoring the running state of an external power supply of the microgrid system, supplying power to the microgrid system through the energy storage unit when the external power supply is in an abnormal state, and changing the charging mode of the energy storage unit into a quick charging mode; when the external power supply is in a normal state, the return electric quantity transmitted to the external power supply by the energy storage unit is acquired, and when the return electric quantity is larger than a preset threshold value, the working mode of the energy storage unit is changed from a charging mode to a discharging mode.
Optionally, when the microgrid system is in an abnormal state, the control method of the microgrid system further comprises: reducing the load of the microgrid system according to the preset power supply and load balance relationship and the preset discharge grade sequence; and acquiring power supply load data of the micro-grid system, and switching the two groups of energy storage units mutually according to the power supply load data and the load requirements of the micro-grid system.
Optionally, when the micro-grid system is in a normal operation state, the power generation unit is connected to the low-voltage distribution section of the micro-grid through the distribution switching loop.
Optionally, when the microgrid system is in an abnormal state, the control method of the microgrid system further comprises: judging whether the micro-grid system is in a low-load operation state in each low-voltage distribution section according to the operation state; when any section of low-voltage distribution section is in a low-load operation state, switching the power generation unit operated by the low-voltage distribution section in the low-load operation state to the high-load low-voltage distribution section through a distribution switching loop; when the two low-voltage distribution sections are in a low-load operation state, the two low-voltage distribution sections are connected in parallel through the low-voltage bus coupler switch, the return electric quantity transmitted to the micro-grid by the power generation unit is obtained, whether the low-voltage distribution sections have surplus electric quantity or not is judged according to the return electric quantity, and when the low-voltage distribution sections have surplus electric quantity, the charging mode of the energy storage unit is started to store energy.
Optionally, when the microgrid system is in an abnormal state, the control method of the microgrid system further comprises: monitoring fault information of the micro-grid system in each low-voltage distribution section; when any one section of low-voltage distribution section has a fault, switching the power generation units operated in the fault low-voltage distribution section to the low-voltage distribution section operated normally through a distribution switching loop to form two groups of power generation units to operate in parallel, acquiring the return power transmitted to the microgrid by the power generation units, judging whether the low-voltage distribution section has surplus power according to the return power, and starting a charging mode of the energy storage unit to store energy when the low-voltage distribution section has surplus power; when the two low-voltage distribution sections have faults, the connection between the energy storage unit and the power generation unit and the two low-voltage distribution sections is cut off through a first preset switching loop, and a closed-loop operation system of the energy storage unit and the power generation unit is established through a second preset switching loop.
Optionally, when the microgrid system is in an abnormal state, the control method of the microgrid system further comprises: monitoring whether a power generation unit of the microgrid system breaks down; when the power generation unit fails, the power generation unit with the failure is cut off; acquiring fault information, operation data and state information of a power generation unit with a fault; and generating an intervention processing program according to the fault information, the operation data and the state information, and sending the fault information and the intervention processing program to a preset processing terminal.
Optionally, when the micro-grid system is in a normal operation state, the production power utilization units are distributed in a low-voltage power distribution section of the micro-grid system according to a preset partition strategy.
Optionally, the microgrid system further comprises a production power utilization unit, and when the microgrid system is in an abnormal state, the control method of the microgrid system further comprises: monitoring whether the micro-grid system has faults in each alternating current distribution section; when any section of alternating current power distribution section has a fault, switching a production power utilization unit which runs in the alternating current power distribution section in the fault state to a normally running alternating current power distribution section through a power distribution switching loop, and linking an energy storage unit to sequentially adjust the running mode and the output power of each equipment of the production power utilization unit according to a preset power supply and load balance relation and a preset power distribution grade sequence of each equipment in the production power utilization unit; and when the two alternating current power distribution sections have faults, the connection between the production power unit and the two low-voltage power distribution sections is cut off.
According to a second aspect, an embodiment of the present invention provides a control system for a microgrid system, including: the monitoring module is used for monitoring the power supply state of the micro-grid system; the first processing module is used for judging whether the micro-grid system is in an abnormal state or not according to the power supply state; and the second processing module is used for sequentially converting the charging piles in the fast charging mode into the slow charging mode according to a preset power supply and load balance relation and a preset grade sequence of each charging pile in the charging pile units when the micro-grid system is in an abnormal state.
An embodiment of the present invention provides a non-transitory computer-readable storage medium, which stores computer instructions, and the computer instructions, when executed by a processor, implement the control method for a microgrid system according to the first aspect and any one of the optional manners of the present invention.
An embodiment of the present invention provides an electronic device, including: the storage and the processor are connected with each other in a communication mode, the storage stores computer instructions, and the processor executes the computer instructions to execute the control method of the microgrid system according to the first aspect and any one of the optional modes of the invention.
The technical scheme of the invention has the following advantages:
the embodiment of the invention provides a control method and a control system of a micro-grid system, which are characterized in that the running state of the micro-grid system is monitored; according to the preset power supply and load balance relation and the preset grade sequence of each charging pile in the charging pile units, when the micro-grid system is in an abnormal state, the charging piles in a fast charging mode are sequentially converted into a slow charging mode, and accurate management of each unit is realized; and the power consumption is reduced, so that the load of a power grid power supply system is reduced, the charging mode is adjusted according to the preset grade of the charging pile, the power consumption requirement of a user is met, the operation cost is reduced, and the safe and stable operation of each unit of the micro-grid system is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a microgrid system in an embodiment of the present invention;
FIG. 2 is a flow chart of a method of controlling a microgrid system in an embodiment of the present invention;
FIG. 3 is a block diagram of a control system of the microgrid system in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device in an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In practical applications, as shown in fig. 1, the microgrid system comprises: energy storage unit (1# energy storage and 2# energy storage), the power generation unit (distributed photovoltaic and distributed wind-powered electricity generation), fill electric pile unit and production electricity unit, wherein every unit still includes two groups, and every group includes a plurality of equipment again, for example: each charging pile unit includes two charging pile groups, each group includes a plurality of charging piles, and it should be noted that, the embodiment of the present invention only exemplifies that the included units and the number of groups in the units can be adjusted according to actual system requirements in actual applications, and the present invention is not limited thereto.
The energy storage unit is a unit configured in the regional micro-grid and used for guaranteeing the stable operation of the power grid by combining the power load property and utilizing the characteristics of manual control and quick response of the energy storage unit, and can be used as an accident emergency power supply to guarantee the emergency operation of important power utilization equipment in the emergency state of a sudden accident of the regional power grid, and the energy storage unit in the regional micro-grid is used for evaluating the characteristics and the economical efficiency of the energy storage equipment by combining the battery energy storage of chemical energy storage generally.
The distributed energy has the characteristics of decentralized access, small scale, independence, flexibility, adaptability to local conditions and supply according to needs, and particularly, the distributed photovoltaic power station is relatively less limited by natural conditions, can be built close to a load center, does not need to build a large power grid for long-distance high-voltage or ultrahigh-voltage power transmission, can greatly reduce line loss and save power transmission and distribution construction and investment cost, is an important energy source in a regional micro power grid, but needs to provide auxiliary energy forms for the regional micro power grid due to the limitation of the power generation time period, and is mutually supplemented with the regional micro power grid.
Along with the development of society, fill electric pile's the new stage that the popularization degree got into comprehensive popularization by beginning exploring, fill electric pile's nimble overall arrangement and to the characteristics that the power requires wide range relatively, provide the wide prospect in little electric wire netting application for it, especially provide good interactive application scene in the cooperation of performance and distributed energy, fill the electric pile unit and include: the method comprises the following steps of charging pile layout design, charging pile unit power supply network, charging pile real-time information acquisition, charging pile and distributed energy economy interaction strategy, charging pile intelligent charging vehicle distribution guidance and the like.
The production electricity utilization units occupy important positions in the regional micro-grid, the safety and reliability of the production electricity utilization are guaranteed to be the target of power network configuration, and a graded power supply system is configured for the production electricity utilization units according to the important level of the production load, so that the balance between the safety and the economy is achieved; the electricity-generating unit for production includes: the system comprises a voltage grade matched with a production load, a distribution room system convenient for power distribution, a power supply network distributed according to needs, an important load power utilization real-time information acquisition, an intelligent power supply strategy interacting with power supply change, an automatic emergency power supply switching strategy under an emergency situation and the like.
The embodiment of the invention provides a control method of a micro-grid system, which specifically comprises the following steps of:
step S1: and monitoring the running state of the microgrid system.
Step S2: and judging whether the micro-grid system is in an abnormal state or not according to the running state.
In the embodiment of the invention, the abnormal state of the microgrid system mainly comprises the following steps: it should be noted that, the embodiment of the present invention only illustrates the abnormal state of the microgrid system, and other abnormal states may be included in practical applications, and the present invention is not limited thereto.
Step S3: when the micro-grid system is in an abnormal state, the charging piles in the fast charging mode are sequentially converted into the slow charging mode according to the preset power supply and load balance relation and the preset grade sequence of each charging pile in the charging pile units.
In the embodiment of the invention, in the design and planning of the charging piles, due to the characteristics of dispersed layout areas and more monomers, in order to ensure the balance of power supply safety, reliability and economy, the power distribution adopts a tree-shaped hierarchical configuration principle, double-loop power supply is adopted, two power supply loops complete the distribution of a main power supply and a standby power supply in a local power distribution box, when a micro-grid system is in an abnormal state, namely in the charging process of a vehicle, when the abnormality or the fault of a micro-grid power supply is detected, firstly, a micro-grid abnormality or fault processing program is started, and according to the balance relation between power supply and power consumption, a conversion program from quick charging to slow charging of secondary, tertiary and quaternary charging piles is sequentially started according to the processing sequence of a charging pile unit and the preset grade sequence of each charging pile, the continuous deterioration of the overload degree of the power supply system is reduced, and (4) pausing the charging pile position distribution of the vehicles entering the parking lot, guiding the vehicles to a waiting area of the parking lot, and reporting the information to the operators on duty.
It should be noted that the preset ranking order of the charging piles is set according to the actual system requirements, and the processing order of each charging pile unit is also preset, which is not limited in the practical application.
The embodiment of the invention provides a control method of a micro-grid system, which comprises the steps of monitoring the running state of the micro-grid system; according to the preset power supply and load balance relation and the preset grade sequence of each charging pile in the charging pile units, when the micro-grid system is in an abnormal state, the charging piles in a fast charging mode are sequentially converted into a slow charging mode, and accurate management of each unit is realized; and the power consumption is reduced, so that the load of a power grid power supply system is reduced, the charging mode is adjusted according to the preset grade of the charging pile, the power consumption requirement of a user is met, the operation cost is reduced, and the safe and stable operation of each unit of the micro-grid system is guaranteed.
Specifically, in an embodiment, the method for controlling the microgrid system further includes the following steps:
step S4: when the micro-grid system is in a normal operation state, the charging pile units are connected to the low-voltage distribution section of the micro-grid through the distribution switching loop according to the load uniform distribution principle.
In the embodiment of the invention, when the microgrid is in a normal operation state, the charging pile unit is connected to the low-voltage distribution section of the microgrid through the power distribution switching loop according to the load uniform distribution principle, so that the low-voltage distribution section uniformly operates with load, the charging pile information is collected in real time, and the data is reported to monitor the operation state of each charging pile.
Specifically, in an embodiment, when the microgrid system is in an abnormal state, the method specifically includes the following steps:
step S30: and monitoring whether the micro-grid system has faults in each alternating current distribution section.
Step S31: when any one section of alternating current distribution section breaks down, the charging pile units running in the alternating current distribution section in the fault state are switched to the alternating current distribution section in normal running through the distribution switching loop, and the charging piles in the fast charging mode are sequentially converted into the slow charging mode according to the preset power supply and load balance relation and the preset level sequence of each charging pile in the charging pile units.
In the embodiment of the invention, when any section of alternating current distribution section breaks down and stops running, the charging pile running in the distribution section cannot run, the charging pile power supply switching alarm program is started according to fault information, a person on duty is informed to manually complete the charging pile power supply switching command of the distribution section one by one according to an instruction and carry out operation confirmation one by one, the charging mode conversion is started or the load shedding program is executed according to the preset power supply and load balance relation of the microgrid, and the operation and logic judgment are carried out step by step according to the load shedding sequence of the first, the second and the third wheels. For example, firstly, the charging pile with the charging completion condition reaching the preset threshold value is switched, the fast charging mode is changed into the slow charging mode, if the preset power supply and load balance relation still cannot be achieved at the moment, the charging piles in other fast charging modes are further changed, or the charging pile with the charging completion condition reaching the preset threshold value is cut off, and part of low-grade production electricity is cut off, so that the power supply and load balance is achieved.
It should be noted that, in the embodiment of the present invention, a related operation performed when the preset power supply and load balance relationship is not reached is illustrated, and in practical application, adaptive adjustment of the operation may also be performed according to an actual requirement, which is not limited to this.
Step S32: when two alternating current power distribution sections break down, the connection between the energy storage unit, the power generation unit and the charging pile unit and the two alternating current power distribution sections is cut off through a first preset switching loop, and a closed-loop operation system of the energy storage unit, the power generation unit and the charging pile unit is established through a second preset switching loop.
In the embodiment of the invention, when two alternating current power distribution sections simultaneously break down and exit from operation or the total station has power failure and maintenance in the operation process of the microgrid, the extreme operation mode automatically/manually starts a low-voltage power distribution, energy storage and new energy alternating current switching program according to the fault and power distribution state information, firstly, the energy storage and power generation unit and the charging pile unit are physically isolated from the low-voltage alternating current power distribution section to prevent the energy storage and power generation unit and the charging pile unit from being in electrical contact with the maintenance or fault power distribution section, the fault and operation range are divided, then, a closed-loop operation system of the energy storage unit, the power generation unit and the charging pile unit is established through a second preset switching loop, the normal work of a primary module and a secondary module of the charging pile unit is sequentially ensured, and.
It should be noted that, in the embodiment of the present invention, it is illustrated that the normal operation of the primary module and the secondary module of the charging pile unit is ensured, the level of the module is set according to the actual operation condition of each module in the charging pile unit, and the present invention is not limited thereto.
Specifically, in an embodiment, the method for controlling the microgrid system further includes the following steps:
step S01: and starting the charging mode of the energy storage unit according to the preset time, and changing the charging mode of the energy storage unit into a slow charging maintenance charging mode according to the valley period duration of the power grid.
Step S02: the method comprises the steps of monitoring the running state of an external power supply of the micro-grid system, supplying power to the micro-grid system through an energy storage unit when the external power supply is in an abnormal state, and changing the charging mode of the energy storage unit into a quick charging mode.
In the embodiment of the invention, in the process of slow charging, maintenance and charging of the battery, after the energy management system detects the abnormality or the fault of the external power supply, the microgrid abnormality or fault processing program is started, the energy storage unit supplies power to the microgrid system to complete reliable power supply of the charging power supply, and meanwhile, the charging mode is converted from slow charging, maintenance and charging into an emergency quick charging program to complete quick energy storage of the energy storage system and enter a standby power supply state in the abnormal operation mode of system power supply.
Step S03: when the external power supply is in a normal state, the returned electric quantity transmitted to the external power supply by the energy storage unit is acquired, and when the returned electric quantity is larger than a preset threshold value, the working mode of the energy storage unit is changed from a charging mode to a discharging mode.
Specifically, when the microgrid system is in an abnormal state, the method specifically comprises the following steps:
step S04: and starting the discharge mode of the energy storage unit according to the preset time, changing the discharge mode of the energy storage unit into a fast discharge mode according to the valley period duration of the power grid, and reserving preset electric quantity as emergency standby electric quantity. The preset electric quantity may be set to 20% according to the actual system performance and the actual situation, and the present invention is not limited thereto.
Step S05: and reducing the load of the microgrid system according to a preset power supply and load balance relationship and a preset discharge grade sequence.
In the embodiment of the invention, when the micro-grid power distribution system has an emergency fault, a fault state processing program is started firstly, the adjustment and intervention of the running mode in the corresponding state are carried out, and the load shedding of the first round and the second round is preferentially carried out according to the balance relation between the adjusted power supply and the load; if the power supply still can not meet the load requirement, starting a primary discharging program and a middle discharging program of the energy storage unit, if the power supply still can not meet the load requirement, starting a three-wheel load shedding program, determining whether to start the high discharging program according to the relation between the power supply and the load requirement, and ensuring that the energy storage system keeps certain emergency standby power consumption.
For example, when an emergency fault occurs in a microgrid power distribution system, firstly, an entertainment power utilization part in production power is adjusted, if the adjusted power utilization part cannot reach a preset power supply and load balance relationship, the heating and refrigerating system in the production power is further cut off and unloaded, and if the adjusted power utilization part cannot meet the preset power supply and load balance relationship, lighting power supply is stopped, emergency lighting is adopted, and the like. It should be noted that, the embodiments of the present invention illustrate the operation of reducing the load, and are only used as examples, and not limited thereto.
Step S06: and acquiring power supply load data of the micro-grid system, and switching the two groups of energy storage units mutually according to the power supply load data and the load requirements of the micro-grid system.
In the embodiment of the invention, when one group of energy storage equipment can not support the load demand of the distribution section, logic operation is carried out according to the supply and demand relationship between the other group of energy storage equipment and the load of the energy storage equipment with a fault and the power supply load data of the microgrid, when the other group of energy storage capacity meets the support condition, an energy storage unit switching command and a switching mode are issued to the energy storage unit for alternating current distribution switching, so that the one group of energy storage equipment can simultaneously supply power to the two sections of distribution sections, the support target of the other group of energy storage equipment is achieved, the mutual transfer of the whole energy storage equipment group between the two groups of distribution sections is realized, the flexible combination of the two groups of energy storage equipment and the two sections of distribution sections is achieved, the needs of various operation modes are met, and. In order to avoid the expansion of the fault range of the fault energy storage unit and ensure the personal safety of maintainers, the fault energy storage unit and the operating microgrid need to be physically isolated, the electrical state information of the isolating switch needs to be monitored on line, and the operation safety of personnel and the microgrid system is ensured from two aspects of organization and technology.
Step S300: when the micro-grid system is in a normal running state, the power generation unit is connected to the low-voltage distribution section of the micro-grid through the power distribution switching loop. Photovoltaic power generation or wind power generation unit switch in the little electric wire netting low-voltage distribution section through the distribution switching circuit with the power generation unit, directly are connected with the load, and the generated energy direct power supply gives the power distribution section load of place, realizes the goal of disappearing on the spot to monitoring power generation unit's running state. It should be noted that, in the embodiment of the present invention, the power generation unit is divided into a photovoltaic power generation unit and a wind power generation unit, and other forms of power generation units may be included in practical applications.
Specifically, in an embodiment, when the microgrid system is in an abnormal state, the method specifically includes the following steps:
step S301: and judging whether the micro-grid system is in a low-load operation state in each low-voltage distribution section according to the operation state.
Step S302: when any section of low-voltage distribution section is in a low-load operation state, the power generation unit operated in the low-voltage distribution section in the low-load operation state is switched to the high-load low-voltage distribution section through the distribution switching loop.
In the embodiment of the invention, when the micro-grid is changed due to load and one section of the micro-grid is in a low-load operation state and cannot absorb wind power generation electric quantity, the power generation units in low-load operation are switched to a large-load low-voltage distribution section through a power distribution switching loop to form two groups of wind power generation units to operate in parallel, and generated electric quantity directly supplies power to the load of the power distribution section, so that the local absorption target is realized; the present invention is described in detail with reference to the accompanying drawings, which are incorporated in and constitute a part of this specification.
Step S303: when the two low-voltage distribution sections are in a low-load operation state, the two low-voltage distribution sections are connected in parallel through the low-voltage bus coupler switch, the return electric quantity transmitted to the micro-grid by the power generation unit is obtained, whether the low-voltage distribution section has surplus electric quantity or not is judged according to the return electric quantity, and when the low-voltage distribution section has surplus electric quantity, the charging mode of the energy storage unit is started to store energy.
In the embodiment of the invention, when the micro-grid is changed due to load, and two power distribution sections are in a low-load operation state and cannot consume the electric quantity of photovoltaic power generation, according to an economic operation principle, firstly, two sections of parallel operation are completed by controlling a low-voltage bus tie switch, meanwhile, one operation transformer is converted into a standby state, the condition of wind power generation consumption on site is judged by monitoring the electric quantity returned by the micro-grid, if the electric quantity surplus still exists, a charging mode of an energy storage unit is started according to the energy storage state of an energy storage system, the automatic control of production electricity is started, heating or refrigerating equipment is linked, the electric quantity is further consumed, and the goal of consumption on site is realized.
Step S304: and monitoring fault information of the micro-grid system in each low-voltage distribution section.
Step S305: when any one section of low-voltage distribution section breaks down, the power generation unit running in the low-voltage distribution section in the fault state is switched to the low-voltage distribution section in normal operation through the power distribution switching loop, two groups of power generation units are formed and run in parallel, the return power quantity transmitted to the micro-grid by the power generation unit is acquired, whether the low-voltage distribution section has surplus power or not is judged according to the return power quantity, and when the low-voltage distribution section has surplus power, the charging mode of the energy storage unit is started to store energy.
Step S306: when the two low-voltage distribution sections have faults, the connection between the energy storage unit and the power generation unit and the two low-voltage distribution sections is cut off through the first preset switching circuit, and a closed-loop operation system of the energy storage unit and the power generation unit is established through the second preset switching circuit.
Step S307: monitoring whether a power generation unit of the microgrid system breaks down; and when the power generation unit fails, cutting off the failed power generation unit.
Step S308: acquiring fault information, operation data and state information of a power generation unit with a fault; and generating an intervention processing program according to the fault information, the operation data and the state information, and sending the fault information and the intervention processing program to a preset processing terminal.
In the embodiment of the invention, when a group of power generation units have faults, the power generation units detect the faults through self protection measurement and control and remove the faults, report the fault information, judge whether to coordinate according to the fault information and the monitored running data and state information of related systems, and send the fault information of the power generation units and a human intervention processing program to remote operators on duty through a 5G network or a wired network. In order to avoid the expansion of the fault range of the fault power generation unit and ensure the personal safety of maintenance personnel, the fault power generation unit is physically isolated from the running microgrid, a forced manual field operation and locking confirmation process is set in a fault processing program, the electrical state information of the isolating switch is monitored on line, and the running safety of the personnel and the microgrid system is ensured from two aspects of organization and technology.
When two groups of power generation units simultaneously or successively break down, firstly, each group of power generation units detects the failure information by self protection measurement and control and removes the action, simultaneously reports the failure information, judges whether to carry out the coordination action according to the failure information and the monitored running data and state information of related systems, sends the failure information of the power generation units and a human intervention processing program to a remote operator on duty through a 5G network or a wired network, and carries out on-line monitoring on the electrical state information of the isolating switch by manual field operation and confirmation according to the failure isolating program.
Specifically, in an embodiment, when the microgrid system is in an abnormal state, the method specifically includes the following steps:
step S5: and monitoring whether the micro-grid system has faults in each alternating current distribution section.
Step S6: when any section of alternating current power distribution section breaks down, the production power utilization unit running in the alternating current power distribution section in the fault state is switched to the alternating current power distribution section running normally through the power distribution switching loop, and the energy storage unit is linked to sequentially adjust the running mode and the output power of each device of the production power utilization unit according to the preset power supply and load balance relation and the preset power distribution grade sequence of each device in the production power utilization unit.
In the embodiment of the invention, when any power distribution section is out of operation due to a fault, the production load running in the power distribution section cannot run due to power loss, an office and life power supply load power supply switching alarm program is started according to fault information, a person on duty is informed to manually complete office and life load power supply switching commands one by one according to instructions and carry out operation confirmation one by one, an energy storage unit is linked to adjust the operation mode and the output power according to the power supply and power utilization balance relation of a microgrid, and an office and life load energy-saving control system or a partition load shedding program is started and executed according to the operation real-time data logic judgment result.
Step S7: and when the two alternating current power distribution sections have faults, the connection between the production power unit and the two low-voltage power distribution sections is cut off.
In the embodiment of the invention, when two power distribution sections simultaneously break down and exit from operation or the total station has power failure and maintenance, office and life load shedding programs are started, all office and life load switches of the power distribution section where the fault is located are quickly tripped out and isolated from the microgrid, the emergency repair or maintenance of the fault power grid is ensured, information is reported to operators on duty, and the information is timely issued to users through a regional communication network.
Step S8: when the operation state of the micro-grid system is normal, the production electricity utilization units are distributed in a low-voltage distribution section of the micro-grid system according to a preset partition strategy.
The embodiment of the invention provides a control method of a micro-grid system, which comprises the steps of monitoring the running state of the micro-grid system; according to the preset power supply and load balance relation and the preset grade sequence of each charging pile in the charging pile units, when the micro-grid system is in an abnormal state, the charging piles in a fast charging mode are sequentially converted into a slow charging mode, and accurate management of each unit is realized; and the power consumption is reduced, so that the load of a power grid power supply system is reduced, the charging mode is adjusted according to the preset grade of the charging pile, the power consumption requirement of a user is met, the operation cost is reduced, and the safe and stable operation of each unit of the micro-grid system is guaranteed.
An embodiment of the present invention further provides a control system of a microgrid system, as shown in fig. 3, including:
the monitoring module 1 is used for monitoring the power supply state of the microgrid system; the module executes the method described in step S1, and is not described herein again.
The first processing module 2 is used for judging whether the micro-grid system is in an abnormal state or not according to the power supply state; the module executes the method described in step S2, and is not described herein again.
The second processing module 3 is used for sequentially converting the charging piles in the fast charging mode into the slow charging mode according to a preset power supply and load balance relation and a preset grade sequence of each charging pile in the charging pile units when the micro-grid system is in an abnormal state; the module executes the method described in step S3, and is not described herein again.
Through the cooperative cooperation of the components, the control system of the micro-grid system provided by the embodiment of the invention monitors the running state of the micro-grid system; according to the preset power supply and load balance relation and the preset grade sequence of each charging pile in the charging pile units, when the micro-grid system is in an abnormal state, the charging piles in a fast charging mode are sequentially converted into a slow charging mode, and accurate management of each unit is realized; and the power consumption is reduced, so that the load of a power grid power supply system is reduced, the charging mode is adjusted according to the preset grade of the charging pile, the power consumption requirement of a user is met, the operation cost is reduced, and the safe and stable operation of each unit of the micro-grid system is guaranteed.
An embodiment of the present invention further provides an electronic device, as shown in fig. 4, the electronic device may include a processor 901 and a memory 902, where the processor 901 and the memory 902 may be connected by a bus or in another manner, and fig. 4 takes the connection by the bus as an example.
The memory 902, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the methods in the embodiments of the present invention. The processor 901 executes various functional applications and data processing of the processor, i.e., implements the above-described method, by executing non-transitory software programs, instructions, and modules stored in the memory 902.
The memory 902 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 901, and the like. Further, the memory 902 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 902 may optionally include memory located remotely from the processor 901, which may be connected to the processor 901 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more modules are stored in the memory 902, which when executed by the processor 901 performs the methods described above.
The specific details of the electronic device may be understood by referring to the corresponding related descriptions and effects in the above method embodiments, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, and the program can be stored in a computer readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
The above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (11)
1. A control method of a micro-grid system is characterized in that the micro-grid system comprises charging pile units, and the control method of the micro-grid system comprises the following steps:
monitoring the running state of the micro-grid system;
judging whether the micro-grid system is in an abnormal state or not according to the running state;
and when the micro-grid system is in an abnormal state, sequentially converting the charging piles in the fast charging mode into the slow charging mode according to a preset power supply and load balance relation and a preset grade sequence of each charging pile in the charging pile units.
2. The method for controlling the microgrid system as claimed in claim 1, wherein the microgrid system further comprises an energy storage unit and a power generation unit, and when the microgrid system is in an abnormal state, the method for controlling the microgrid system further comprises:
monitoring whether the micro-grid system has faults in each alternating current distribution section;
when any one section of alternating current distribution section breaks down, switching the charging pile units operating in the faulted alternating current distribution section to the normally operating alternating current distribution section through a distribution switching loop, and sequentially converting the charging piles in the fast charging mode into the slow charging mode according to a preset power supply and load balance relation and a preset grade sequence of each charging pile in the charging pile units;
when two alternating current power distribution sections break down, the connection between the energy storage unit, the power generation unit and the charging pile unit and the two alternating current power distribution sections is cut off through a first preset switching loop, and a closed-loop operation system of the energy storage unit, the power generation unit and the charging pile unit is established through a second preset switching loop.
3. The method of controlling a microgrid system according to claim 2, further comprising:
starting a charging mode of the energy storage unit according to preset time, and changing the charging mode of the energy storage unit into a slow charging maintenance charging mode according to the valley period duration of a power grid;
monitoring the running state of an external power supply of the microgrid system, supplying power to the microgrid system through the energy storage unit when the external power supply is in an abnormal state, and changing the charging mode of the energy storage unit into a quick charging mode;
when the external power supply is in a normal state, the return electric quantity transmitted to the external power supply by the energy storage unit is acquired, and when the return electric quantity is larger than a preset threshold value, the working mode of the energy storage unit is changed from a charging mode to a discharging mode.
4. The method for controlling the microgrid system as claimed in claim 2, wherein when the microgrid system is in an abnormal state, the method for controlling the microgrid system further comprises:
reducing the load of the microgrid system according to the preset power supply and load balance relationship and the preset discharge grade sequence;
and acquiring power supply load data of the micro-grid system, and switching the two groups of energy storage units mutually according to the power supply load data and the load requirements of the micro-grid system.
5. The method for controlling the microgrid system as claimed in claim 2, wherein when the microgrid system is in an abnormal state, the method for controlling the microgrid system further comprises:
judging whether the micro-grid system is in a low-load operation state in each low-voltage distribution section according to the operation state;
when any section of low-voltage distribution section is in a low-load operation state, switching the power generation unit operated by the low-voltage distribution section in the low-load operation state to the high-load low-voltage distribution section through a distribution switching loop;
when the two low-voltage distribution sections are in a low-load operation state, the two low-voltage distribution sections are connected in parallel through the low-voltage bus coupler switch, the return electric quantity transmitted to the micro-grid by the power generation unit is obtained, whether the low-voltage distribution sections have surplus electric quantity or not is judged according to the return electric quantity, and when the low-voltage distribution sections have surplus electric quantity, the charging mode of the energy storage unit is started to store energy.
6. The method for controlling the microgrid system as claimed in claim 5, wherein when the microgrid system is in an abnormal state, the method for controlling the microgrid system further comprises:
monitoring fault information of the micro-grid system in each low-voltage distribution section;
when any one section of low-voltage distribution section has a fault, switching the power generation units operated in the fault low-voltage distribution section to the low-voltage distribution section operated normally through a distribution switching loop to form two groups of power generation units to operate in parallel, acquiring the return power transmitted to the microgrid by the power generation units, judging whether the low-voltage distribution section has surplus power according to the return power, and starting a charging mode of the energy storage unit to store energy when the low-voltage distribution section has surplus power;
when the two low-voltage distribution sections have faults, the connection between the energy storage unit and the power generation unit and the two low-voltage distribution sections is cut off through a first preset switching loop, and a closed-loop operation system of the energy storage unit and the power generation unit is established through a second preset switching loop.
7. The method for controlling the microgrid system as claimed in claim 5, wherein when the microgrid system is in an abnormal state, the method for controlling the microgrid system further comprises:
monitoring whether a power generation unit of the microgrid system breaks down;
when the power generation unit fails, the power generation unit with the failure is cut off;
acquiring fault information, operation data and state information of a power generation unit with a fault;
and generating an intervention processing program according to the fault information, the operation data and the state information, and sending the fault information and the intervention processing program to a preset processing terminal.
8. The microgrid system control method according to claim 1, characterized in that the microgrid system further comprises a production electricity utilization unit, and when the microgrid system is in an abnormal state, the microgrid system control method further comprises:
monitoring whether the micro-grid system has faults in each alternating current distribution section;
when any section of alternating current power distribution section has a fault, switching a production power utilization unit which runs in the alternating current power distribution section in the fault state to a normally running alternating current power distribution section through a power distribution switching loop, and linking an energy storage unit to sequentially adjust the running mode and the output power of each equipment of the production power utilization unit according to a preset power supply and load balance relation and a preset power distribution grade sequence of each equipment in the production power utilization unit;
and when the two alternating current power distribution sections have faults, the connection between the production power unit and the two low-voltage power distribution sections is cut off.
9. A control system for a microgrid system, comprising:
the monitoring module is used for monitoring the power supply state of the micro-grid system;
the first processing module is used for judging whether the micro-grid system is in an abnormal state or not according to the power supply state;
and the second processing module is used for sequentially converting the charging piles in the fast charging mode into the slow charging mode according to a preset power supply and load balance relation and a preset grade sequence of each charging pile in the charging pile units when the micro-grid system is in an abnormal state.
10. A computer-readable storage medium storing computer instructions which, when executed by a processor, implement a method of controlling a microgrid system according to any one of claims 1 to 8.
11. An electronic device, comprising:
a memory and a processor, the memory and the processor being communicatively connected to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the method of controlling the microgrid system according to any one of claims 1 to 8.
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