CN111555317A - Monitoring method, monitoring device and monitoring system of wind-solar micro-grid by using grid-connected technology - Google Patents
Monitoring method, monitoring device and monitoring system of wind-solar micro-grid by using grid-connected technology Download PDFInfo
- Publication number
- CN111555317A CN111555317A CN202010470266.8A CN202010470266A CN111555317A CN 111555317 A CN111555317 A CN 111555317A CN 202010470266 A CN202010470266 A CN 202010470266A CN 111555317 A CN111555317 A CN 111555317A
- Authority
- CN
- China
- Prior art keywords
- power
- grid
- energy storage
- storage system
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- 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
-
- 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
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention discloses a monitoring method, a monitoring device and a monitoring system of a wind-solar micro-grid by using a grid-connected technology, belongs to the field of micro-grids of power systems, and can predict the power generation power of power generation equipment in the micro-grids and the change of the load borne by the power generation equipment. The method can track voltage information of a grid-connected point of a large power grid, obtain a large power grid dispatching instruction in real time, detect the capacity of the energy storage system in real time, set a discharge interval of the energy storage system, optimally manage the energy of the energy storage system based on an SOC hierarchical control strategy, correct the charge and discharge power of the energy storage system in real time, optimize the working performance of the energy storage system, formulate and implement an optimal control strategy, ensure that a micro power grid participates in voltage regulation of the large power grid according to the requirements of the large power grid when being connected to the grid, and ensure the voltage stability during grid-connected.
Description
Technical Field
The invention relates to the field of a micro-grid of a power system, in particular to a monitoring method, a monitoring device and a monitoring system of a wind-solar micro-grid by using a grid-connected technology.
Background
With the continuous progress of society, the traditional energy power generation and human activities bring verified damage to the social environment, and meanwhile, the energy consumption is continuously increased, so that the traditional energy is increasingly reduced. At present, the method is gradually popularized in a form of micro-grid-connected power generation of new energy. However, because the micro-grid power generation of new energy such as wind power, photovoltaic power and the like is intermittent, and certain influence is generated on a large power grid during grid connection, an energy storage system is often adopted in the micro-grid to ensure smooth grid connection.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the monitoring method, the monitoring device and the monitoring system of the wind-solar micro-grid by using the grid-connected technology, which have the advantages of high reaction speed, quick action, capability of improving the energy utilization rate, no impact on a large grid and reduction of the power utilization safety risk.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect,
a monitoring method of a wind-solar micro-grid applying a grid-connected technology comprises the following steps:
monitoring the output requirement of the wind-solar micro-grid;
and adjusting the charge-discharge mode and power of the energy storage system according to the output requirement.
Further, the monitoring of the output requirement of the wind-solar micro-grid comprises:
receiving a scheduling instruction of a large power grid system;
and obtaining the power to be output of the wind-solar micro-grid at the grid-connected point according to the scheduling instruction.
Further, the monitoring of the output requirement of the wind-solar micro-grid comprises:
acquiring voltage information of a grid-connected point of a large power grid system in real time;
and adjusting the voltage parameters of grid-connected points in the wind-solar micro-grid according to the voltage information.
Further, modulating the charge-discharge mode and the power of the energy storage system according to the output demand comprises:
acquiring active power of all power generation equipment in the microgrid in real time;
and adjusting and modulating the energy storage system according to the active power and the power to be output of the wind-light microgrid.
Further, the energy storage system modulated according to the active power and the power to be output of the wind-light microgrid comprises:
setting a working interval of the energy storage system, wherein the working interval comprises: a discharging interval, a charging interval and a waiting interval;
and selecting a working interval of the energy storage system according to the active power and the power to be output of the wind-light microgrid, and adopting a corresponding control strategy.
Further, selecting a working interval of the energy storage system according to the active power and the power to be output of the wind-light microgrid, and adopting a corresponding control strategy comprises:
when the active power is larger than the power to be output, the energy storage system works in a charging interval, a charging mode is adopted, and the charging power is equal to a value obtained by subtracting the power to be output from the active power;
when the active power is smaller than the power to be output, the energy storage system works in a discharging interval, a discharging mode is adopted, and the discharging power is equal to a value obtained by subtracting the active power from the power to be output;
and when the active power is equal to the power to be output, the energy storage system works in a waiting interval and is not charged or discharged.
Further, monitoring the capacity of the energy storage system in real time;
and when the capacity of the energy storage system does not meet the adjustment, alarming to a manager, and adjusting the active power of the micro-grid power generation equipment.
Further, when the capacity of the energy storage system does not meet the adjustment, alerting a manager and adjusting the active power of the microgrid power generation device comprises:
when the energy storage system works in a discharging interval, when the residual storage space of the energy storage system is smaller than a value obtained by subtracting the power to be output from the active power of the microgrid, the active power of the power generation equipment is reduced;
when the energy storage system works in a charging interval, when the residual energy storage capacity of the energy storage system is smaller than a value obtained by subtracting the active power from the power to be output of the microgrid, the active power of the power generation equipment is increased.
In a second aspect of the present invention,
a monitoring device of a wind-solar micro-grid applying a grid-connected technology comprises:
the output demand monitoring module is used for monitoring the output demand of the wind-solar micro-grid;
and the adjusting module is used for adjusting the charging and discharging mode and the power of the energy storage system according to the output requirement.
In a third aspect,
a wind-solar micro-grid system applying a grid-connected technology adopts any one of the monitoring methods in the schemes.
This application adopts above technical scheme, possesses following beneficial effect at least:
the technical scheme of the invention discloses a monitoring method of a wind-solar micro-grid by using a grid-connected technology, which can predict the power generation power of power generation equipment in the micro-grid and the change of the load borne by the power generation equipment. The method can track voltage information of a grid-connected point of a large power grid, obtain a large power grid dispatching instruction in real time, detect the capacity of the energy storage system in real time, set a discharge interval of the energy storage system, optimally manage the energy of the energy storage system based on an SOC hierarchical control strategy, correct the charge and discharge power of the energy storage system in real time, optimize the working performance of the energy storage system, formulate and implement an optimal control strategy, ensure that a micro power grid participates in voltage regulation of the large power grid according to the requirements of the large power grid when being connected to the grid, and ensure the voltage stability during grid-connected.
Drawings
In order to more clearly illustrate the embodiments of the present application 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, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a monitoring method for a wind-solar micro-grid using a grid-connected technology according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a monitoring device of a wind-solar micro-grid using a grid-connected technology according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a wind-solar micro-grid system applying a grid-connected technology according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the technical solutions of the present invention is provided with reference to the accompanying drawings and examples. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
In one embodiment, as shown in fig. 1, the invention provides a monitoring method of a wind-solar micro-grid using a grid-connected technology, which includes the following steps:
monitoring the output requirement of the wind-solar micro-grid;
and adjusting the charge-discharge mode and power of the energy storage system according to the output requirement.
The monitoring method of the wind-solar micro-grid applying the grid-connected technology can predict the power generation power of the power generation equipment in the micro-grid and the change of the load borne by the power generation equipment. The method can track voltage information of a grid-connected point of a large power grid, obtain a large power grid dispatching instruction in real time, detect the capacity of the energy storage system in real time, set a discharge interval of the energy storage system, optimally manage the energy of the energy storage system based on an SOC hierarchical control strategy, correct the charge and discharge power of the energy storage system in real time, optimize the working performance of the energy storage system, formulate and implement an optimal control strategy, ensure that a micro power grid participates in voltage regulation of the large power grid according to the requirements of the large power grid when being connected to the grid, and ensure the voltage stability during grid-connected.
As a further supplementary description of the above embodiment, the embodiment of the present invention further provides another monitoring method for a wind-solar micro-grid using a grid-connected technology, including the following steps:
monitoring the output requirement of the wind-solar micro-grid;
as an optional implementation manner of the embodiment of the present invention, monitoring the output requirement of the wind-solar micro-grid includes:
receiving a scheduling instruction of a large power grid system;
and obtaining the power to be output of the wind-solar micro-grid at the grid-connected point according to the scheduling instruction.
It should be noted that the large grid system is composed of a plurality of micro grids or a plurality of small grids, and when the output power of one micro grid or small grid changes, other micro grids or small grids are required to change the output power, so that the voltage of the large grid system is kept stable, and the project of changing the output power of other micro grids or small grids needs a scheduling instruction. Therefore, the dispatching instruction of the large power grid system is obtained to obtain the power to be output of the wind-solar micro-grid.
In addition, during the grid connection process of the power system, a phenomenon called islanding can occur. I.e. a power generation device incorporated in a public power grid, which power generation device, in case of a grid outage, cannot detect or has no corresponding detection means at all, and still feeds power to the public power grid. In general, islanding can adversely affect the entire distribution system and customer premise equipment, including:
1) the life safety of power maintenance personnel is endangered;
2) affecting a protection switch action program on the power distribution system;
3) unstable properties of power supply voltage and frequency generated in an island region can damage electric equipment;
4) when the power supply is recovered, the voltage phase asynchronism caused can generate surge current, and the secondary tripping or damage to a photovoltaic system, a load and a power supply system can be caused;
5) the photovoltaic grid-connected power generation system causes the problem of phase-lack power supply of a three-phase load of the system due to single-phase power supply.
Therefore, when the grid is connected, the islanding effect must be detected in time and the damage caused by the islanding effect must be avoided.
To avoid islanding, optionally, monitoring the output demand of the wind and light microgrid comprises:
acquiring voltage information of a grid-connected point of a large power grid system in real time;
and adjusting voltage parameters at grid-connected points in the wind-solar micro-grid according to the voltage information.
And detecting the voltage information at the grid-connected point of the large power grid system at any time, and taking measures in time once the islanding phenomenon occurs. Taking the grid connection of a photovoltaic system as an example, the photovoltaic system is required to synchronously operate with a power grid when in grid connection operation, the rated frequency of the power grid is 50Hz, the frequency allowable deviation after the grid connection of the photovoltaic system is required to meet the regulation of GB/T15945, namely the deviation value is allowed to be O.5HZ, and when the frequency range is exceeded, the photovoltaic system is required to act within 0.2S to be disconnected with the power grid. Specific anomaly frequency response times are specified in the following table:
| frequency range/Hz | Response time/s |
| <49.5 | 0.16 |
| >50.5 | 0.16 |
| <47.0 | 0.16 |
| <(47.0～49.3) | 0.16 to 300 variable |
| >50.5 | 0.16 |
And adjusting the charge-discharge mode and power of the energy storage system according to the output requirement.
As an optional implementation manner of the embodiment of the present invention, modulating the charge-discharge mode and the power of the energy storage system according to the output requirement includes:
acquiring active power of all power generation equipment in the microgrid in real time;
and adjusting and modulating the energy storage system according to the active power and the power to be output of the wind-light microgrid.
Wherein, the little electric wire netting of waiting to output power according to active power and wind-light modulates modulation energy storage system includes:
setting a working interval of the energy storage system, wherein the working interval comprises: a discharging interval, a charging interval and a waiting interval;
and selecting a working interval of the energy storage system according to the active power and the power to be output of the wind-light microgrid, and adopting a corresponding control strategy.
Further, selecting a working interval of the energy storage system according to the active power and the power to be output of the wind-light microgrid, and adopting a corresponding control strategy comprising:
when the active power is larger than the power to be output, the energy storage system works in a charging interval, and a charging mode is adopted, wherein the charging power is equal to a value obtained by subtracting the power to be output from the active power;
when the active power is smaller than the power to be output, the energy storage system works in a discharging interval, a discharging mode is adopted, and the discharging power is equal to a value obtained by subtracting the active power from the power to be output;
when the active power is equal to the power to be output, the energy storage system works in a waiting interval, and neither charging nor discharging is performed.
It should be noted that sometimes, the requirement for the power to be output in the scheduling instruction of the large grid system is extreme, and the energy storage system of the microgrid cannot meet the requirement, so that some adjustments need to be performed on the microgrid power generation equipment at this time.
Therefore, as an optional implementation manner of the embodiment of the present invention, the method further includes:
monitoring the capacity of the energy storage system in real time;
and when the capacity of the energy storage system does not meet the adjustment, alarming is given to a manager, and the active power of the micro-grid power generation equipment is adjusted.
Further optionally, when the capacity of the energy storage system does not meet the adjustment, alerting a manager, and adjusting the active power of the microgrid power generation device comprises:
when the energy storage system works in a discharging interval, when the residual storage space of the energy storage system is smaller than a value obtained by subtracting the power to be output from the active power of the microgrid, the active power of the power generation equipment is reduced;
when the energy storage system works in a charging interval, when the residual energy storage capacity of the energy storage system is smaller than a value obtained by subtracting the active power from the power to be output of the microgrid, the active power of the power generation equipment is increased.
It can be understood that when the regulation of the energy storage system and the power generation equipment does not meet the dispatching instruction of the large power grid system, the regulation is timely reflected to a manager to regulate the dispatching instruction.
According to the other monitoring method for the grid connection of the microgrid, which is provided by the embodiment of the invention, based on the purposes of improving the energy utilization rate, lightening the environmental pollution and reducing the safety risk of electricity utilization, the monitoring method can predict the power generation power of the fan in the microgrid and the change of the load borne by the fan. The monitoring method can track voltage information of a grid-connected point of a large power grid, obtain a large power grid dispatching instruction in real time, detect the capacity of the energy storage system in real time, set a discharge interval of the energy storage system, optimally manage the energy of the energy storage system based on an SOC hierarchical control strategy, correct the charge and discharge power of the energy storage system in real time, optimize the working performance of the energy storage system, formulate and implement an optimal control strategy, ensure that a micro power grid participates in voltage regulation of the large power grid according to the requirements of the large power grid when being connected to the grid, and ensure the voltage stability during grid-connected.
In one embodiment, as shown in fig. 2, the present invention further provides a monitoring device for a wind-solar micro-grid using a grid-connected technology, including:
the output demand monitoring module 210 is used for monitoring the output demand of the wind-solar micro-grid;
optionally, the output demand monitoring module is further configured to receive a scheduling instruction of the large power grid system; and obtaining the power to be output of the wind-solar micro-grid at the grid-connected point according to the scheduling instruction.
Optionally, the output demand monitoring module is further configured to collect voltage information at a grid-connected point in real time; and adjusting voltage parameters at grid-connected points in the wind-solar micro-grid according to the voltage information.
And the adjusting module 211 is configured to adjust the charging and discharging mode and power of the energy storage system according to the output requirement.
Optionally, the adjusting module is further configured to modulate the charge-discharge mode and the power of the energy storage system according to the output demand, and includes: acquiring active power of all power generation equipment in the microgrid in real time; and adjusting and modulating the energy storage system according to the active power and the power to be output of the wind-light microgrid. In this embodiment, the active power of the power generation equipment is the power that the microgrid can provide to the large grid system, that is, the power obtained by removing the power used by the load, such as the total power.
Further optionally, the energy storage system is modulated according to the active power and the power to be output of the wind-light microgrid, and the method comprises the following steps of setting an energy storage system working interval, wherein the working interval comprises: a discharging interval, a charging interval and a waiting interval; and selecting a working interval of the energy storage system according to the active power and the power to be output of the wind-light microgrid, and adopting a corresponding control strategy.
Specifically, a working interval of the energy storage system is selected according to active power and power to be output of the wind-light microgrid, and the corresponding control strategy comprises the following steps: when the active power is larger than the power to be output, the energy storage system works in a charging interval, and a charging mode is adopted, wherein the charging power is equal to a value obtained by subtracting the power to be output from the active power; when the active power is smaller than the power to be output, the energy storage system works in a discharging interval, a discharging mode is adopted, and the discharging power is equal to a value obtained by subtracting the active power from the power to be output; when the active power is equal to the power to be output, the energy storage system works in a waiting interval, and neither charging nor discharging is performed.
In some embodiments, the adjustment module is further configured to monitor the capacity of the energy storage system in real time;
and when the capacity of the energy storage system does not meet the adjustment, alarming is given to a manager, and the active power of the micro-grid power generation equipment is adjusted. Illustratively, when the capacity of the energy storage system does not meet the regulation, alerting a manager and regulating the active power of the microgrid power generation device comprises:
when the energy storage system works in a discharging interval, when the residual storage space of the energy storage system is smaller than a value obtained by subtracting the power to be output from the active power of the microgrid, the active power of the power generation equipment is reduced;
when the energy storage system works in a charging interval, when the residual energy storage capacity of the energy storage system is smaller than a value obtained by subtracting the active power from the power to be output of the microgrid, the active power of the power generation equipment is increased.
The monitoring device of the wind-solar micro-grid applying the grid-connected technology comprises an output demand monitoring module and an adjusting module. The output demand of the wind-solar micro-grid is acquired through the output demand monitoring module, and the charging and discharging mode and power of the energy storage system are adjusted through the adjusting module according to the output demand. The power generated by the power generation equipment in the microgrid and the variation of the load borne by the power generation equipment can be predicted. The device can track voltage information of a grid-connected point of a large power grid, obtain a large power grid dispatching instruction in real time, detect the capacity of an energy storage system in real time, set a discharging interval of the energy storage system, optimally manage the energy of the energy storage system based on an SOC hierarchical control strategy, correct the charging and discharging power of the energy storage system in real time, optimize the working performance of the energy storage system, formulate and implement an optimal control strategy, ensure that a micro-grid participates in voltage regulation of the large power grid according to the requirements of the large power grid when being connected to the grid, and ensure the voltage stability during grid-connected.
In an embodiment, the present invention further provides a wind and photovoltaic micro-grid system using a grid-connected technology, as shown in fig. 3, including: the system comprises a distributed power supply 301, an energy storage system 302, an energy conversion device 303, a load 304 and a monitoring system 305, wherein the distributed power supply corresponds to power generation equipment capable of converting new energy into electric energy, the energy conversion device corresponds to a rectification inverter, and the monitoring system monitors the microgrid to be connected in a grid mode.
The wind-solar micro-grid system applying the grid-connected technology can predict the power generation power of power generation equipment in the micro-grid and the change of the load borne by the power generation equipment. The system can track voltage information of a grid-connected point of a large power grid, obtain a large power grid dispatching instruction in real time, detect the capacity of the energy storage system in real time, set a discharging interval of the energy storage system, optimally manage the energy of the energy storage system based on an SOC hierarchical control strategy, correct the charging and discharging power of the energy storage system in real time, optimize the working performance of the energy storage system, formulate and implement an optimal control strategy, ensure that a micro power grid participates in voltage regulation of the large power grid according to the requirements of the large power grid when being connected to the grid, and ensure the voltage stability during grid-connected.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A monitoring method of a wind-solar micro-grid applying a grid-connected technology is characterized by comprising the following steps:
monitoring the output requirement of the wind-solar micro-grid;
and adjusting the charge-discharge mode and power of the energy storage system according to the output requirement.
2. The method of claim 1, wherein: the monitoring of the output requirement of the wind-solar micro-grid comprises the following steps:
receiving a scheduling instruction of a large power grid system;
and obtaining the power to be output of the wind-solar micro-grid at the grid-connected point according to the scheduling instruction.
3. The method of claim 1, wherein: the monitoring of the output requirement of the wind-solar micro-grid comprises the following steps:
acquiring voltage information of a grid-connected point of a large power grid system in real time;
and adjusting the voltage parameters of grid-connected points in the wind-solar micro-grid according to the voltage information.
4. The method of claim 2, wherein: modulating charge-discharge modes and power of the energy storage system according to the output demand comprises:
acquiring active power of all power generation equipment in the microgrid in real time;
and adjusting and modulating the energy storage system according to the active power and the power to be output of the wind-light microgrid.
5. The method of claim 4, wherein: the energy storage system modulated according to the active power and the power to be output of the wind-light microgrid comprises:
setting a working interval of the energy storage system, wherein the working interval comprises: a discharging interval, a charging interval and a waiting interval;
and selecting a working interval of the energy storage system according to the active power and the power to be output of the wind-light microgrid, and adopting a corresponding control strategy.
6. The method of claim 5, wherein: selecting a working interval of the energy storage system according to the active power and the power to be output of the wind-light microgrid, and adopting a corresponding control strategy to comprise:
when the active power is larger than the power to be output, the energy storage system works in a charging interval, a charging mode is adopted, and the charging power is equal to a value obtained by subtracting the power to be output from the active power;
when the active power is smaller than the power to be output, the energy storage system works in a discharging interval, a discharging mode is adopted, and the discharging power is equal to a value obtained by subtracting the active power from the power to be output;
and when the active power is equal to the power to be output, the energy storage system works in a waiting interval and is not charged or discharged.
7. The method of claim 6, further comprising:
monitoring the capacity of the energy storage system in real time;
and when the capacity of the energy storage system does not meet the adjustment, alarming to a manager, and adjusting the active power of the micro-grid power generation equipment.
8. The method of claim 7, wherein: when the capacity of the energy storage system does not meet the adjustment, an alarm is given to a manager, and the adjustment of the active power of the microgrid power generation equipment comprises the following steps:
when the energy storage system works in a discharging interval, when the residual storage space of the energy storage system is smaller than a value obtained by subtracting the power to be output from the active power of the microgrid, the active power of the power generation equipment is reduced;
when the energy storage system works in a charging interval, when the residual energy storage capacity of the energy storage system is smaller than a value obtained by subtracting the active power from the power to be output of the microgrid, the active power of the power generation equipment is increased.
9. The utility model provides an application is incorporated into power networks monitoring devices of scene little electric wire netting of technique which characterized in that includes:
the output demand monitoring module is used for monitoring the output demand of the wind-solar micro-grid;
and the adjusting module is used for adjusting the charging and discharging mode and the power of the energy storage system according to the output requirement.
10. A wind-solar micro-grid system applying a grid-connected technology is characterized in that: the system employs the monitoring method of any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010470266.8A CN111555317A (en) | 2020-05-28 | 2020-05-28 | Monitoring method, monitoring device and monitoring system of wind-solar micro-grid by using grid-connected technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010470266.8A CN111555317A (en) | 2020-05-28 | 2020-05-28 | Monitoring method, monitoring device and monitoring system of wind-solar micro-grid by using grid-connected technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111555317A true CN111555317A (en) | 2020-08-18 |
Family
ID=72006778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010470266.8A Pending CN111555317A (en) | 2020-05-28 | 2020-05-28 | Monitoring method, monitoring device and monitoring system of wind-solar micro-grid by using grid-connected technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111555317A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114268141A (en) * | 2021-09-27 | 2022-04-01 | 浙江华云电力工程设计咨询有限公司 | Energy storage system SOC correction and adjustment method and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734196A (en) * | 2015-04-13 | 2015-06-24 | 成都鼎智汇科技有限公司 | Monitoring device of wind, photovoltaic and storage-integrated micro-grid capable of being operated in a grid-connected manner |
| CN105262135A (en) * | 2015-11-11 | 2016-01-20 | 广东电网有限责任公司电力科学研究院 | Wind, light and diesel storage microgrid system containing composite energy storage and coordinated control method during grid connection |
| CN105322564A (en) * | 2015-10-22 | 2016-02-10 | 国家电网公司 | Wind-solar integrated power generation system capable of automatically achieving voltage balance |
| US20180262007A1 (en) * | 2015-09-18 | 2018-09-13 | Abb Schweiz Ag | Micro-grid having a diesel generator with clutch |
-
2020
- 2020-05-28 CN CN202010470266.8A patent/CN111555317A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734196A (en) * | 2015-04-13 | 2015-06-24 | 成都鼎智汇科技有限公司 | Monitoring device of wind, photovoltaic and storage-integrated micro-grid capable of being operated in a grid-connected manner |
| US20180262007A1 (en) * | 2015-09-18 | 2018-09-13 | Abb Schweiz Ag | Micro-grid having a diesel generator with clutch |
| CN105322564A (en) * | 2015-10-22 | 2016-02-10 | 国家电网公司 | Wind-solar integrated power generation system capable of automatically achieving voltage balance |
| CN105262135A (en) * | 2015-11-11 | 2016-01-20 | 广东电网有限责任公司电力科学研究院 | Wind, light and diesel storage microgrid system containing composite energy storage and coordinated control method during grid connection |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114268141A (en) * | 2021-09-27 | 2022-04-01 | 浙江华云电力工程设计咨询有限公司 | Energy storage system SOC correction and adjustment method and system |
| CN114268141B (en) * | 2021-09-27 | 2023-11-03 | 浙江华云电力工程设计咨询有限公司 | Method and system for correcting and adjusting SOC of energy storage system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103337869B (en) | A kind of method of novel battery energy-storage system and function integration design thereof | |
| RU2642422C2 (en) | Hybrid power plant in which combining of generating facilities and energy storage system are used in real time | |
| CN102427230B (en) | Wind-light storage combined dispatching method and system used for distributed microgrid island operation | |
| Jian et al. | A review of control strategies for DC micro-grid | |
| TWI774142B (en) | Ac load power supply system and method | |
| Mohamed et al. | Hierarchical control for DC microgrid clusters with high penetration of distributed energy resources | |
| CN204168208U (en) | A kind of photovoltaic micro networking | |
| CN104022527B (en) | Direct current micro-grid system | |
| CN106410966B (en) | A kind of energy management apparatus applied to the system of providing multiple forms of energy to complement each other | |
| CN104281977A (en) | Hybrid microgrid application platform and control method theref | |
| KR101566296B1 (en) | Frequency Control System in Power System | |
| CN108599379B (en) | Power monitoring system for micro-grid group | |
| Xiao et al. | Flat tie-line power scheduling control of grid-connected hybrid microgrids | |
| CN109659941B (en) | AC/DC hybrid micro-grid autonomous control method and system | |
| WO2019075879A1 (en) | Running mode conversion method for alternating-current/direct-current hybrid microgrid | |
| Zhang et al. | A master slave peer to peer integration microgrid control strategy based on communication | |
| Yan et al. | Frequency control and optimal operation of low-inertia power systems with HVDC and renewable energy: a review | |
| CN111555317A (en) | Monitoring method, monitoring device and monitoring system of wind-solar micro-grid by using grid-connected technology | |
| CN203312829U (en) | Inverter capable of smoothly switching between grid-off mode and grid-connected mode | |
| Nakamura et al. | Green base station using robust solar system and high performance lithium ion battery for next generation wireless network (5G) and against mega disaster | |
| CN110896221B (en) | Power management system | |
| CN111030182A (en) | Micro-grid electric energy monitoring system | |
| Hamdaoui et al. | An intelligent islanding selection algorithm for optimizing the distribution network based on emergency classification | |
| CN107681649B (en) | Method for controlling voltage stability of direct-current micro-grid bus | |
| Roscoe et al. | Increasing security of supply by the use of a local power controller during large system disturbances |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200818 |
|
| RJ01 | Rejection of invention patent application after publication |