CN108063438B - Control method and device for direct-current micro-grid system - Google Patents
Control method and device for direct-current micro-grid system Download PDFInfo
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- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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
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Abstract
The invention discloses a control method and a control device for a direct-current micro-grid system. The method comprises the following steps: under the condition of receiving a grid-connected operation instruction, starting a grid-connected self-operation mode of the direct-current micro-grid system, wherein the direct-current micro-grid comprises distributed energy, a direct-current load, an energy storage battery and a grid-connected device; and under the condition of receiving the off-grid operation instruction, starting an off-grid self-operation mode of the direct-current micro-grid system, wherein the distributed energy sources, the energy storage batteries and the direct-current loads are not scheduled and managed under the grid-connected self-operation mode and the off-grid self-operation mode. By the method and the device, the effect of intelligently controlling the direct current micro-grid system is achieved.
Description
Technical Field
The invention relates to the field of control, in particular to a control method and device for a direct-current micro-grid system.
Background
With the rapid development and widespread application of distributed energy, the application of microgrid technology based on new energy is rapidly developed, and the direct-current microgrid has advantages of becoming a hotspot for research and application.
Electric energy flows unidirectionally from a power generation end to a power utilization end in a traditional power grid power distribution system, energy application is carried out according to a mode of taking according to needs, a micro-grid system based on new energy application comprises various energy applications such as distributed energy, a power grid and energy storage, and in order to meet the requirement of various energy interactive application, the micro-grid system needs to have various operation modes to ensure energy balance and system stability. The requirements of the direct current micro-grid system under different application scenes are different, and the direct current micro-grid system cannot be intelligently controlled at present.
Aiming at the problem that the intelligent control of the direct current micro-grid system cannot be carried out in the related technology, an effective solution is not provided at present.
Disclosure of Invention
The invention mainly aims to provide a control method and a control device for a direct-current micro-grid system, and aims to solve the problem that the direct-current micro-grid system cannot be intelligently controlled in the prior art.
In order to achieve the above object, according to an aspect of the present invention, there is provided a method for controlling a dc microgrid system, comprising: under the condition of receiving a grid-connected operation instruction, starting a grid-connected self-operation mode of a direct-current micro-grid system, wherein the direct-current micro-grid comprises distributed energy, a direct-current load, an energy storage battery and a grid-connected device; and under the condition of receiving an off-grid operation instruction, starting an off-grid self-operation mode of the direct-current micro-grid system, wherein the distributed energy, the energy storage battery and the direct-current load are not scheduled and managed in the grid-connected self-operation mode and the off-grid self-operation mode.
Further, after the grid-connected self-running mode of the direct-current micro-grid system is started, the method further comprises the following steps: detecting whether a first mode operation instruction is received; and under the condition of receiving the first mode operation instruction, scheduling and managing system energy according to the load characteristics.
Further, the scheduling management of the system energy according to the load characteristics comprises: storing electricity for the energy storage battery under the condition that the electricity price is less than or equal to a first preset electricity price; and discharging the energy storage battery under the condition that the electricity price is more than or equal to a second preset electricity price, wherein the second preset electricity price is more than the first preset electricity price.
Further, after the grid-connected self-running mode of the direct-current micro-grid system is started, the method further comprises the following steps: detecting whether a second mode operation instruction is received; and monitoring the home environment under the condition of receiving the second mode operation instruction, and adjusting the direct current load according to a monitoring result.
Further, after the off-grid self-running mode of the direct current microgrid system is started, the method further comprises the following steps: detecting whether a third mode operation instruction is received; and under the condition of receiving the third mode operation instruction, carrying out hierarchical management on the plurality of direct current loads.
In order to achieve the above object, according to one aspect of the present invention, there is provided a control device for a dc microgrid system, comprising: the system comprises a first starting unit, a second starting unit and a third starting unit, wherein the first starting unit is used for starting a grid-connected self-running mode of a direct current micro-grid system under the condition that a grid-connected running instruction is received, and the direct current micro-grid system comprises distributed energy, a direct current load, an energy storage battery and a grid-connected device; and the second starting unit is used for starting an off-grid self-running mode of the direct-current micro-grid system under the condition of receiving an off-grid running instruction, wherein the distributed energy, the energy storage battery and the direct-current load are not subjected to scheduling management under the grid-connected self-running mode and the off-grid self-running mode.
Further, the apparatus further comprises: the first detection unit is used for detecting whether a first mode operation instruction is received or not after the first starting unit starts a grid-connected self-operation mode of the direct-current micro-grid system; and the scheduling unit is used for scheduling and managing the system energy according to the load characteristics under the condition of receiving the first mode operation instruction.
Further, the scheduling unit includes: the electric power storage subunit is used for storing electric power for the energy storage battery under the condition that the electric power price is less than or equal to a first preset electric power price; and the discharging subunit is used for discharging the energy storage battery under the condition that the electricity price is greater than or equal to a second preset electricity price, wherein the second preset electricity price is greater than the first preset electricity price.
Further, the apparatus further comprises: the second detection unit is used for detecting whether a second mode operation instruction is received or not after the first starting unit starts a grid-connected self-operation mode of the direct-current micro-grid system; and the monitoring unit is used for monitoring the home environment under the condition of receiving the second mode operation instruction and adjusting the direct current load according to a monitoring result.
Further, the apparatus further comprises: the third detection unit is used for detecting whether a third mode operation instruction is received or not after the second starting unit starts the off-grid self-operation mode of the direct-current micro-grid system; and the hierarchical management unit is used for performing hierarchical management on the plurality of direct current loads under the condition of receiving the third mode operation instruction.
In order to achieve the above object, according to one aspect of the present invention, there is provided a storage medium, characterized in that the storage medium includes a stored program, wherein when the program runs, a device on which the storage medium is located is controlled to execute the above control method of the dc microgrid system.
In order to achieve the above object, according to one aspect of the present invention, a processor is provided, wherein the processor is configured to execute a program, wherein the program executes a control method of the above dc microgrid system.
In the embodiment of the invention, the direct current micro-grid system has two basic operation states, the grid-connected self-operation mode of the direct current micro-grid system is started under the condition that a grid-connected operation instruction is received, the off-grid self-operation mode of the direct current micro-grid system is started under the condition that an off-grid operation instruction is received, the two basic operation modes do not carry out scheduling management on new energy power generation, energy storage, loads and the like, each unit of the system is controlled in a self-adaptive mode to realize power and energy balance of the micro-grid system, the technical problem that intelligent control cannot be carried out on the direct current micro-grid system is solved, and the technical effect of intelligently controlling the direct current.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flow chart of an alternative method of controlling a dc microgrid system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a grid-connected state of an alternative direct-current micro-grid system according to an embodiment of the invention;
FIG. 3 is a schematic diagram of an alternative off-grid state of a DC microgrid system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an alternative operating mode of a dc microgrid system according to an embodiment of the present invention;
fig. 5 is a flow chart of another alternative method of controlling a dc microgrid system according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an alternative control device for a dc microgrid system according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. 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 application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention provides a control method of a direct-current micro-grid system.
Fig. 1 is a flowchart of an alternative control method for a dc microgrid system according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
step S102: and under the condition of receiving a grid-connected operation instruction, starting a grid-connected self-operation mode of the direct-current micro-grid system, wherein the direct-current micro-grid comprises distributed energy, a direct-current load, an energy storage battery and a grid-connected device.
Step S104: and under the condition of receiving the off-grid operation instruction, starting an off-grid self-operation mode of the direct-current micro-grid system, wherein the distributed energy sources, the energy storage batteries and the direct-current loads are not scheduled and managed under the grid-connected self-operation mode and the off-grid self-operation mode.
The direct current micro-grid system comprises distributed energy sources such as wind power generation and photovoltaic power generation, various levels of direct current loads, energy storage batteries and a grid connection device, each part connected into the direct current micro-grid system has a control function of maintaining self stable operation, and the system has two basic operation states of grid connection and grid disconnection, which are respectively shown in fig. 2 and fig. 3. In a grid-connected state, a power grid is connected into the system, and the system can take power from the power grid and supply power to the power grid. In the off-grid state, the grid is disconnected from the system.
The system self-running mode comprises a system self-running mode with photovoltaic and other new energy sources prioritized, load taken as required and multi-energy source mutual supplement in grid-connected and off-grid running states, namely a grid-connected self-running mode and an off-grid self-running mode. Two basic operation modes, namely a grid-connected self-operation mode and an off-grid self-operation mode, do not carry out scheduling management on new energy power generation, energy storage, loads and the like, and each unit of the system is controlled in a self-adaptive mode to realize power and energy balance of the micro-grid system.
In the embodiment of the invention, the direct current micro-grid system has two basic operation states, the grid-connected self-operation mode of the direct current micro-grid system is started under the condition that a grid-connected operation instruction is received, the off-grid self-operation mode of the direct current micro-grid system is started under the condition that an off-grid operation instruction is received, the two basic operation modes do not carry out scheduling management on new energy power generation, energy storage, loads and the like, each unit of the system is controlled in a self-adaptive mode to realize power and energy balance of the micro-grid system, the technical effect of intelligently controlling the direct current micro-grid system is achieved, and the technical problem that intelligent control cannot be carried out on the direct current.
Optionally, after the grid-connected self-running mode of the direct-current microgrid system is started, the method further includes: detecting whether a first mode operation instruction is received; and under the condition of receiving the first mode operation instruction, scheduling and managing the system energy according to the load characteristics.
Optionally, the scheduling and managing the system energy according to the load characteristics includes: storing electricity for the energy storage battery under the condition that the electricity price is less than or equal to a first preset electricity price; and discharging the energy storage battery under the condition that the electricity price is greater than or equal to a second preset electricity price, wherein the second preset electricity price is greater than the first preset electricity price.
The cost can be effectively saved by storing electricity when the electricity price is low and discharging electricity when the electricity price is high.
The electric power storage includes two types: direct storage and indirect storage. For example, charging an energy storage battery and charging an electric vehicle and the like are direct storage methods; management of the bootable preconditioning load (preheating or cold processing for hot loads or for cold loads) is an indirect storage approach.
The discharge includes two types: direct discharge and indirect discharge. For example, discharging an energy storage battery and discharging an electric vehicle are direct discharge methods; the method is an indirect discharging mode for guidable pre-regulation load management (derating treatment for heat load or cold load guarantee basic application state).
Optionally, after the grid-connected self-running mode of the direct-current microgrid system is started, the method further includes: detecting whether a second mode operation instruction is received; and under the condition of receiving the second mode operation instruction, monitoring the home environment, and adjusting the direct current load according to the monitoring result.
The dc load may be adjusted specifically by: electrical appliances such as an air conditioner, a humidifier, an air purifier and the like are managed and adjusted to ensure the air temperature, humidity and cleanliness; electrical appliances such as a water heater, a water purifier and the like are managed and adjusted to ensure hot water and drinking water; the electric appliances such as the refrigerator, the electric cooker and the like are managed and adjusted to meet the requirement of high food preservation.
The user can preset target parameters of the home environment, and the second mode operation instruction carries the target parameters of the home environment set by the user. For example, if the user sets the indoor target temperature to be T1 and the target humidity to be Q1, the indoor temperature and humidity are monitored, the monitoring result is compared with the target temperature T1 and the target humidity Q1, and the air conditioner and the humidifier are adjusted according to the comparison result until the indoor temperature reaches the target temperature T1 and the indoor humidity reaches the target humidity Q1.
Through monitoring the house environment, adjust direct current load according to the monitoring result for the people inhales the environment more comfortable, and can satisfy the user customization requirement.
Optionally, after the off-grid self-running mode of the direct-current microgrid system is started, the method further includes: detecting whether a third mode operation instruction is received; and under the condition of receiving the third mode operation instruction, carrying out hierarchical management on the plurality of direct current loads.
The third mode operation instruction is an instruction for instructing to start the energy saving optimization mode. And under the off-grid state, carrying out graded management on the plurality of direct current loads according to the storage allowance of the energy storage battery and the requirement of the guarantee duration. And classifying the direct current load according to the priority level, wherein the priority level can be set by a user or can be default. Generally, the default priority of the just-needed load (such as lighting equipment and the like) is the highest, the priority of the low-power necessary load (such as a fan) is the next highest, then the high-power necessary load (such as an electric cooker) is followed, and finally the non-necessary load (such as a water heater and a humidifier) is followed. The step management of the plurality of direct current loads comprises the following specific steps: the use of the load is guaranteed from high to low according to priority.
If the reserve capacity of the energy storage battery is high and the requirement on the guarantee duration is short, more loads can be in an operating state; and if the storage capacity of the energy storage battery is low or the requirement on the guarantee duration is long, the high-priority load works normally strictly according to the priority level, and the low-priority load is cut off.
By carrying out hierarchical management on the loads, the high-priority loads are guaranteed to work normally preferentially, and the energy-saving operation of the system is realized.
In order to meet the requirement of energy application diversification, the MGCC controller is embedded into 3 operation optimization modes of system economy optimization, comfort optimization and energy conservation optimization, the energy of the micro-grid system is managed more finely from the aspects of user experience, economy, energy conservation and the like, the application scenes and the application modes are diversified in selection, and the application requirements of different users are met. As shown in fig. 4, the operation modes of the dc microgrid system include: a grid-connected type and an off-grid type. The grid-connected type is divided into a grid-connected self-running mode, an economic optimization mode and a comfortable optimization mode. The off-grid type is divided into an off-grid self-running mode and an energy-saving optimization mode. Each mode will be described in detail below.
The economic optimization operation mode comprises the following steps: aiming at the peak-valley electricity price condition, scheduling and managing system energy according to load characteristics, storing electricity in the valley electricity price period, including direct storage and indirect storage, charging an energy storage battery and an electric vehicle into an electric energy direct storage mode, and managing a guidable preconditioning load (preheating or cold processing a heat load or a cold load) into an electric energy indirect storage mode; the peak-time electricity price period discharging comprises direct discharging and indirect discharging, the discharging of the energy storage battery and the electric automobile is a direct electric energy releasing mode, and the guidable pre-adjusting load management (derating treatment on a heat load or a cold load guarantee basic application state) is a direct electric energy releasing mode.
Comfort optimization mode of operation: aiming at the comfort of human living environment, the household environment is monitored and managed, the comfort of the human living environment is used as target guidance, and the requirement of the environment comfort is realized according to the customized requirement of a user. The air temperature, humidity and cleanliness guarantee (embodied in the management of electrical appliances such as an air conditioner, a humidifier and an air purifier) during the activity period of people, the hot water and drinking water guarantee (embodied in the management of electrical appliances such as a water heater and a water purifier), the high fresh-keeping requirement on food (embodied in the management of electrical appliances such as a refrigerator and an electric cooker) and the comfort of human living environment are realized by the application management of the electrical appliances.
Energy-saving optimization operation mode: aiming at the off-grid operation mode, starting a system energy-saving optimization operation mode, predicting the capacity of the energy storage battery and the power generation of new energy according to the requirement of the reserve capacity of the energy storage battery and the guarantee duration, carrying out hierarchical management and regulation on loads (preferentially guaranteeing just-needed loads (lighting, water purifiers and refrigerators), preferentially guaranteeing low-power essential loads (fans and purifiers) and high-power essential loads (electric cookers) according to the power prediction, and cutting off non-essential loads (air conditioners, washing machines, water heaters and humidifiers), thereby realizing the energy-saving optimization operation of the system.
As shown in fig. 5, grid-connected and off-grid of the system is judged by monitoring a grid interface converter unit G _ Inv; in the grid-connected self-running mode, the MGCC monitors that a user interface sends an upper-layer instruction, and when an economic optimization running mode or a comfortable optimization running mode instruction is received, the system executes a corresponding optimization running strategy instruction to enter a corresponding optimization running mode; and in the off-network self-running mode, the MGCC monitors that the user interface sends an upper-layer instruction and simultaneously monitors the energy storage state and the load power, and when the electric quantity of the energy storage battery reaches a lower limit threshold value or the electric quantity of the energy storage battery cannot meet the load power requirement for a rated time or receives an energy-saving optimization running mode instruction, the system executes an energy-saving optimization running strategy instruction and enters an energy-saving optimization running mode.
The direct-current micro-grid system provided by the embodiment of the invention realizes the nearby utilization of distributed energy, the direct-current load directly utilizes direct current, the intelligent control of power generation and power utilization is realized, and the application requirements of diversified users are met through the optimization of the operation mode. And (3) providing an optimized operation strategy of the direct-current micro-grid system, carrying out constraint on 3 aspects of economy, comfort, energy conservation and the like, and realizing the optimized operation of the system aiming at different application requirements.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
The embodiment of the invention provides a control device of a direct-current micro-grid system, which can be used for executing the control method of the direct-current micro-grid system.
Fig. 6 is a schematic diagram of an alternative control device for a dc microgrid system according to an embodiment of the present invention, as shown in fig. 6, the device including: a first opening unit 10 and a second opening unit 20.
The first starting unit 10 is configured to start a grid-connected self-operation mode of the direct-current microgrid system when a grid-connected operation instruction is received, where the direct-current microgrid system includes a distributed energy source, a direct-current load, an energy storage battery, and a grid-connected device.
And the second starting unit 20 is configured to start an off-grid self-operation mode of the direct-current microgrid system when the off-grid operation instruction is received, where the distributed energy sources, the energy storage batteries, and the direct-current loads are not scheduled and managed in the grid-connected self-operation mode and the off-grid self-operation mode.
Optionally, the apparatus further comprises: the device comprises a first detection unit and a scheduling unit. The first detection unit is used for detecting whether a first mode operation instruction is received or not after the first starting unit 10 starts the grid-connected self-operation mode of the direct-current microgrid system. And the scheduling unit is used for scheduling and managing the system energy according to the load characteristics under the condition of receiving the first mode operation instruction.
Optionally, the scheduling unit includes: an electric storage subunit and a discharge subunit. And the electric power storage subunit is used for storing the electric power of the energy storage battery under the condition that the electric power price is less than or equal to a first preset electric power price. And the discharging subunit is used for discharging the energy storage battery under the condition that the electricity price is greater than or equal to a second preset electricity price, wherein the second preset electricity price is greater than the first preset electricity price.
Optionally, the apparatus further comprises: the second detection unit and the monitoring unit. And the second detection unit is used for detecting whether a second mode operation instruction is received or not after the first starting unit 10 starts the grid-connected self-operation mode of the direct-current microgrid system. And the monitoring unit is used for monitoring the home environment under the condition of receiving the second mode operation instruction and adjusting the direct current load according to the monitoring result.
Optionally, the apparatus further comprises: a third detection unit and a hierarchical management unit. And a third detecting unit, configured to detect whether an off-grid self-operation mode of the dc microgrid system is started by the second starting unit 20, and then detect that an operation instruction of a third mode is received. And the hierarchical management unit is used for performing hierarchical management on the plurality of direct current loads under the condition of receiving the third mode operation instruction.
The control device of the direct current microgrid system comprises a processor and a memory, wherein the first starting unit 10, the second starting unit 20 and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. One or more than one kernel can be set, and the control method of the direct current micro-grid system is executed by adjusting the kernel parameters.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
An embodiment of the present invention provides a storage medium having a program stored thereon, where the program, when executed by a processor, implements a control method for a dc microgrid system.
The embodiment of the invention provides a processor, which is used for running a program, wherein the program is run to execute a control method of a direct current micro-grid system.
The embodiment of the invention provides equipment, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein the processor executes the program and realizes the following steps: (method claim step, independent + dependent). The device herein may be a server, a PC, a PAD, a mobile phone, etc.
The present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device:
under the condition of receiving a grid-connected operation instruction, starting a grid-connected self-operation mode of the direct-current micro-grid system, wherein the direct-current micro-grid comprises distributed energy, a direct-current load, an energy storage battery and a grid-connected device; and under the condition of receiving the off-grid operation instruction, starting an off-grid self-operation mode of the direct-current micro-grid system, wherein the distributed energy sources, the energy storage batteries and the direct-current loads are not scheduled and managed under the grid-connected self-operation mode and the off-grid self-operation mode.
After a grid-connected self-running mode of the direct-current micro-grid system is started, detecting whether a first mode running instruction is received; and under the condition of receiving the first mode operation instruction, scheduling and managing the system energy according to the load characteristics.
Storing electricity for the energy storage battery under the condition that the electricity price is less than or equal to a first preset electricity price; and discharging the energy storage battery under the condition that the electricity price is greater than or equal to a second preset electricity price, wherein the second preset electricity price is greater than the first preset electricity price.
After a grid-connected self-running mode of the direct-current micro-grid system is started, whether a second mode running instruction is received or not is detected; and under the condition of receiving the second mode operation instruction, monitoring the home environment, and adjusting the direct current load according to the monitoring result.
After an off-grid self-running mode of the direct-current micro-grid system is started, whether a third mode running instruction is received or not is detected; and under the condition of receiving the third mode operation instruction, carrying out hierarchical management on the plurality of direct current loads.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. A control method of a direct current micro-grid system is characterized by comprising the following steps:
under the condition of receiving a grid-connected operation instruction, starting a grid-connected self-operation mode of a direct-current micro-grid system, wherein the direct-current micro-grid comprises distributed energy, a direct-current load, an energy storage battery and a grid-connected device;
starting an off-grid self-running mode of the direct-current micro-grid system under the condition that an off-grid running instruction is received, wherein the distributed energy, the energy storage battery and the direct-current load are not scheduled and managed under the grid-connected self-running mode and the off-grid self-running mode;
after the off-grid self-running mode of the direct-current microgrid system is started, the method further comprises the following steps:
detecting whether a third mode operation instruction is received;
under the condition that the third mode operation instruction is received, carrying out hierarchical management on the plurality of direct current loads according to the storage capacity of the energy storage battery and the requirement of the guaranteed duration, wherein the hierarchical management is carried out at least according to the following modes: dividing the direct current load into an on-demand type load, a low-power essential type load, a high-power essential type load and a non-essential type load;
wherein, according to the energy storage battery margin and the guarantee duration requirement, the step management of the plurality of direct current loads comprises: if the reserve capacity of the energy storage battery is high and the requirement on the guarantee duration is short, controlling the loads with the number greater than the preset number to be in an operating state; if the storage capacity of the energy storage battery is low or the guarantee duration is required to be long, controlling the high-priority load to work according to the priority level, and cutting off the low-priority load;
after the grid-connected self-running mode of the direct-current micro-grid system is started, the method further comprises the following steps: detecting whether a second mode operation instruction is received, wherein the second mode operation instruction carries target parameters of a home environment set by a user;
monitoring a home environment under the condition of receiving the second mode operation instruction, and adjusting the direct current load according to a monitoring result, wherein the adjusting the direct current load according to the monitoring result comprises: and managing and adjusting the electric appliances in the home environment based on the target parameters of the home environment.
2. The control method according to claim 1, wherein after the grid-connected self-running mode of the direct-current microgrid system is started, the method further comprises the following steps:
detecting whether a first mode operation instruction is received;
and under the condition of receiving the first mode operation instruction, scheduling and managing system energy according to the load characteristics.
3. The control method according to claim 2, wherein the scheduling management of the system energy according to the load characteristics comprises:
storing electricity for the energy storage battery under the condition that the electricity price is less than or equal to a first preset electricity price;
and discharging the energy storage battery under the condition that the electricity price is more than or equal to a second preset electricity price, wherein the second preset electricity price is more than the first preset electricity price.
4. A control device of a direct current micro-grid system is characterized by comprising:
the system comprises a first starting unit, a second starting unit and a third starting unit, wherein the first starting unit is used for starting a grid-connected self-running mode of a direct current micro-grid system under the condition that a grid-connected running instruction is received, and the direct current micro-grid system comprises distributed energy, a direct current load, an energy storage battery and a grid-connected device;
the second starting unit is used for starting an off-grid self-running mode of the direct-current microgrid system under the condition that an off-grid running instruction is received, wherein the distributed energy, the energy storage battery and the direct-current load are not subjected to scheduling management under the grid-connected self-running mode and the off-grid self-running mode;
the third detection unit is used for detecting whether a third mode operation instruction is received or not after the second starting unit starts the off-grid self-operation mode of the direct-current micro-grid system;
the grading management unit is used for carrying out grading management on the plurality of direct current loads according to the storage capacity of the energy storage battery and the requirement of the guarantee duration under the condition of receiving the third mode operation instruction, wherein the grading management unit is used for grading at least according to the following modes: dividing the direct current load into an on-demand type load, a low-power essential type load, a high-power essential type load and a non-essential type load;
the grading management unit is further used for controlling the loads with the number larger than the preset number to be in an operating state under the conditions that the surplus quantity of the energy storage battery is high and the requirement on the guarantee duration is short; under the condition that the storage capacity of the energy storage battery is low or the requirement on the guarantee duration is long, controlling the high-priority load to work according to the priority level, and cutting off the low-priority load;
the second detection unit is used for detecting whether a second mode operation instruction is received or not after the first starting unit starts a grid-connected self-operation mode of the direct-current microgrid system, wherein the second mode operation instruction carries target parameters of a home environment set by a user;
and the monitoring unit is used for monitoring the home environment and adjusting the direct current load according to a monitoring result under the condition of receiving the second mode operation instruction, wherein the monitoring unit is also used for managing and adjusting the electric appliances in the home environment based on the target parameters of the home environment.
5. The control device of claim 4, wherein the device further comprises:
the first detection unit is used for detecting whether a first mode operation instruction is received or not after the first starting unit starts a grid-connected self-operation mode of the direct-current micro-grid system;
and the scheduling unit is used for scheduling and managing the system energy according to the load characteristics under the condition of receiving the first mode operation instruction.
6. The control device according to claim 5, wherein the scheduling unit includes:
the electric power storage subunit is used for storing electric power for the energy storage battery under the condition that the electric power price is less than or equal to a first preset electric power price;
and the discharging subunit is used for discharging the energy storage battery under the condition that the electricity price is greater than or equal to a second preset electricity price, wherein the second preset electricity price is greater than the first preset electricity price.
7. A storage medium, characterized in that the storage medium comprises a stored program, wherein when the program runs, a device in which the storage medium is located is controlled to execute the control method of the dc microgrid system according to any one of claims 1 to 3.
8. A processor, characterized in that the processor is configured to run a program, wherein the program is configured to execute the control method of the dc microgrid system according to any one of claims 1 to 3 when running.
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| CN114094594B (en) * | 2021-11-24 | 2024-04-19 | 国网河北省电力有限公司经济技术研究院 | Hierarchical control method and device for direct current load of transformer substation and terminal equipment |
| CN116979577A (en) * | 2023-06-14 | 2023-10-31 | 上海凯营新能源技术有限公司 | Micro-grid control system, method, equipment and medium |
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| CN102347620A (en) * | 2010-07-30 | 2012-02-08 | 北京市电力公司 | Micro grid control method |
| CN107194516A (en) * | 2017-06-07 | 2017-09-22 | 华北电力大学 | Multi-energy complementary micro-grid distributed optimization dispatching method containing multiagent |
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| CN102347620A (en) * | 2010-07-30 | 2012-02-08 | 北京市电力公司 | Micro grid control method |
| CN107194516A (en) * | 2017-06-07 | 2017-09-22 | 华北电力大学 | Multi-energy complementary micro-grid distributed optimization dispatching method containing multiagent |
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