CN112909997A - Distributed photovoltaic remote control based grid connection and disconnection device - Google Patents
Distributed photovoltaic remote control based grid connection and disconnection device Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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Abstract
The invention provides a distributed photovoltaic remote control based grid connection and disconnection device. The device is connected to a public transformation public power grid system through an intelligent electric meter assembly and is used for carrying out remote grid connection and disconnection control on the distributed photovoltaic power generation system. The device comprises an electric energy metering device, a remote intelligent electronic switch, an alternating current contactor, a change-over switch and an edge calculation unit; the device acquires the current electric energy monitoring parameters of the distributed photovoltaic power generation system through the electric energy metering device and sends the electric energy monitoring parameters to the intelligent electric meter component; and the remote intelligent electronic switch adjusts the states of the alternating current contactor and the change-over switch based on the attribute of the electric energy monitoring parameter. The device can real-time detection control photovoltaic user operational aspect, stops photovoltaic user to increase the solar energy component polar plate privately and enlarges the generated energy, effectively avoids the power consumption condition of violating the contract to take place.
Description
Technical Field
The invention belongs to the technical field of photovoltaic power generation grid-connected control, and particularly relates to a distributed photovoltaic remote control based grid-connected and splitting device.
Background
The photovoltaic power generation system can be divided into an off-grid photovoltaic power generation system and a grid-connected photovoltaic power generation system, and the investment of the grid-connected photovoltaic power generation system is reduced by 25% compared with that of the off-grid photovoltaic power generation system. The photovoltaic power generation system is connected to a large power grid in a micro-grid mode for grid-connected operation, the photovoltaic power generation system and the large power grid are mutually supported, the important technology for improving the scale of photovoltaic power generation is provided, the grid-connected operation of the photovoltaic power generation system is also a main direction of future technical development, and the range and the flexibility of solar energy use can be expanded through grid connection.
With the increase of the number of the photovoltaic power generation grids, the fluctuation and the intermittent characteristics of the photovoltaic power generation will certainly affect the stability of the grid-connected system. Particularly, under the influence of factors such as solar radiation intensity and environmental temperature, the characteristics of photovoltaic power generation become more and more prominent, which is not beneficial to the dispatching of a power system and brings trouble to power grid dispatching personnel.
Therefore, the Chinese patent application with the application number of CN202010814408.8 provides a regional photovoltaic power generation abnormity real-time monitoring method based on a big data technology, which comprises the steps of constructing a photovoltaic power generation abnormity intelligent identification model; acquiring photovoltaic power generation and power consumption data and external meteorological data of a system; identifying abnormal photovoltaic power data based on a 3 sigma-like criterion to detect the abnormal data; identifying abnormal users with higher and lower degrees of various users by an outlier analysis method; an abnormal user is timely found and identified through an abnormal identification model based on statistical analysis and Copula thought; through the fault early warning of a photovoltaic user, the safe and stable operation level is improved, and the fault rate of the photovoltaic equipment of a client is reduced; the equipment fault can be accurately predicted, and the safe and stable operation level is improved; and a maintenance and operation plan is made in a targeted manner, and advance operation and maintenance are carried out.
The chinese patent application with application number CN202010694254.3 proposes a method for controlling emergency risk reduction of a power system including photovoltaic power generation, which includes: determining the starting and stopping state of a non-photovoltaic power generation system and the output condition of the photovoltaic power generation system; determining the scheduling condition and the photovoltaic load reduction amount of the standby capacity of the non-photovoltaic power generation system in the real-time operation stage; the on-off state of the non-photovoltaic power generation system, the group output condition of the photovoltaic generator, the standby capacity scheduling condition of the non-photovoltaic power generation system and the photovoltaic load reduction amount are used as control instructions for scheduling each non-photovoltaic power generation system and each photovoltaic power generation system in production. The photovoltaic power generation system has emergency supporting capacity for the power grid, the problem of power shortage possibly occurring in the operation of the power grid is solved, photovoltaic load shedding and power system operation risks are considered, the output of the photovoltaic power generation system is actively adjusted to support the emergency power of the power system when the power of the power system is insufficient, and the economic benefit maximization is realized on the premise of ensuring the safety of the power grid.
However, the above technical solution is still a passive control embodiment. Due to the instability of the distributed power grid, the safety of the main power grid is easily affected; at this time, some photovoltaic users may increase capacity privately, and the like, and the grid confusion is also caused.
In the prior art, no effective technical scheme is provided for series of chaotic problems of newly built (including extension, reconstruction and collectively called new construction) distributed renewable energy power generation projects, private capacity increase of distributed photovoltaic installation operators, private grid-connected voltage increase, over-capacity power generation and the like.
Disclosure of Invention
In order to solve the technical problem, the invention provides a distributed photovoltaic remote control-based grid connection and disconnection device. The device is connected to a public transformation public power grid system through an intelligent electric meter assembly and is used for carrying out remote grid connection and disconnection control on the distributed photovoltaic power generation system. The device comprises an electric energy metering device, a remote intelligent electronic switch, an alternating current contactor, a change-over switch and an edge calculation unit; the device acquires the current electric energy monitoring parameters of the distributed photovoltaic power generation system through the electric energy metering device and sends the electric energy monitoring parameters to the intelligent electric meter component; and the remote intelligent electronic switch adjusts the states of the alternating current contactor and the change-over switch based on the attribute of the electric energy monitoring parameter, so that splitting and grid connection control are realized.
Specifically, the invention provides a distributed photovoltaic remote control-based grid connection and disconnection device, which is connected to a public transformation public power grid system through an intelligent electric meter assembly and is used for carrying out remote grid connection and disconnection control on a distributed photovoltaic power generation system;
the distributed photovoltaic power generation system comprises a plurality of solar panel assemblies, wherein the plurality of solar panel assemblies are connected with a current collector assembly;
the collector assembly is connected to the string-type photovoltaic inverter through an air circuit breaker;
the device is connected to the string-type photovoltaic inverter through a residual current operated protector;
the device comprises an electric energy metering device, a remote intelligent electronic switch, an alternating current contactor and a change-over switch;
the device acquires the current electric energy monitoring parameters of the distributed photovoltaic power generation system through the electric energy metering device and sends the electric energy monitoring parameters to the intelligent electric meter component;
the remote intelligent electronic switch adjusts the states of the alternating current contactor and the change-over switch based on the attribute of the electric energy monitoring parameter;
the electric energy metering device comprises at least one edge computing unit, the edge computing unit is communicated with a light intensity sensor arranged on the solar polar plate component of the distributed photovoltaic power generation system and is used for acquiring data of a plurality of light intensity sensors, and the data of the light intensity sensors comprise solar radiation intensity data;
and the edge calculation unit judges the stability of the radiation intensity based on the solar radiation intensity data, and takes the judgment result of the stability of the radiation intensity as a part of the electric energy monitoring parameters.
More specifically, the edge calculation unit performing the radiation intensity stability determination based on the solar radiation intensity data includes:
composing the solar radiation intensity data included in the plurality of light intensity sensor data into a solar radiation intensity data matrix RI;
the edge calculation unit judges the radiation intensity stability based on the solar radiation intensity data matrix RI;
and taking the stability judgment result of the solar radiation intensity data matrix RI as the radiation intensity stability judgment result.
And if the radiation intensity is judged to be stable, acquiring other current electric energy monitoring parameters of the distributed photovoltaic power generation system through the electric energy metering device, wherein the other electric energy monitoring parameters comprise terminal voltage of the distributed photovoltaic power generation system.
And if the other electric energy monitoring parameters are normal, the public transformation public power grid system provides power for the intelligent electric energy meter component through an open type knife switch.
And if the other electric energy monitoring parameters are normal, the device starts the remote intelligent electronic switch.
And if the other electric energy monitoring parameters are normal, the device closes the action of the alternating current contactor in a suction mode.
And if the other electric energy monitoring parameters are abnormal, the device disconnects the remote intelligent electronic switch.
In the technical scheme of the invention, firstly, an edge calculation unit is introduced to set a preposed safety condition, and the preposed judgment result is not influenced by artificial subjective factors; the photovoltaic user operation condition can be detected and controlled in real time, the photovoltaic user is prevented from increasing a solar component polar plate privately to enlarge the generated energy, and the situation of illegal power utilization is effectively avoided.
Therefore, by adopting the technical scheme of the invention, the network connection full-flow management of newly-built (including extension, reconstruction and collectively called as ' new construction ') distributed renewable energy power generation projects can be further enhanced and realized, the problems existing in the distributed renewable energy grid-connected management service process are further solved, the flow simplification and the operation standardization are realized according to the principle of the distributed renewable energy grid-connected management according to the project management of the same industry expansion, the grid-connected service quality is practically improved, the distributed photovoltaic grid-connected and splitting orderly operation is realized, the real-time monitoring and the online control on the distributed photovoltaic are realized, the series chaotic problems of the distributed photovoltaic installer such as private capacity increase, private grid-connected voltage increase, over-capacity power generation and the like are thoroughly solved, and the ' passive control ' on the photovoltaic ' is realized as ' active control '.
Further advantages of the invention will be apparent in the detailed description section in conjunction with the drawings attached hereto.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a module architecture diagram based on a distributed photovoltaic remote control grid connection and disconnection device according to an embodiment of the present invention
FIG. 2 is a schematic view of the device of FIG. 1 in modular connection with a photovoltaic power generation system
FIG. 3 is a schematic diagram of the electrical connection of the device of FIG. 1 to a photovoltaic power generation system
FIG. 4 is a schematic diagram of the connection of the internal switches of the apparatus of FIG. 1
FIG. 5 is a schematic diagram of the control of the photovoltaic grid-connected power generation by the device of FIG. 1
FIG. 6 is a control schematic for performing photovoltaic system splitting using the apparatus of FIG. 1
Detailed Description
Referring to fig. 1, a block architecture diagram of a distributed photovoltaic remote control grid connection and disconnection apparatus according to an embodiment of the present invention is shown.
In fig. 1, the device is connected to a public transformation public power grid system through a smart meter assembly, and is used for performing remote grid connection and disconnection control on a distributed photovoltaic power generation system.
The distributed photovoltaic power generation system shown in fig. 1 includes a plurality of solar panel assemblies.
Each solar polar plate component of the distributed photovoltaic power generation system is provided with at least one light intensity sensor for communication, the light intensity sensors are used for acquiring data of a plurality of light intensity sensors, and the data of the light intensity sensors comprise solar radiation intensity data.
Partially shown in fig. 1, the apparatus includes an electric energy metering device, a remote intelligent electronic switch, an ac contactor, and a transfer switch;
the electric energy metering device comprises at least one edge computing unit, the edge computing unit is communicated with a light intensity sensor arranged on the solar polar plate component of the distributed photovoltaic power generation system and is used for acquiring data of a plurality of light intensity sensors, and the data of the light intensity sensors comprise solar radiation intensity data;
and the edge calculation unit judges the stability of the radiation intensity based on the solar radiation intensity data, and takes the judgment result of the stability of the radiation intensity as a part of the electric energy monitoring parameters.
On the basis of fig. 1, reference is continued to fig. 2.
The plurality of solar panel assemblies are connected with the collector assembly;
the collector assembly is connected to the string-type photovoltaic inverter through an air circuit breaker;
the device is connected to the string-type photovoltaic inverter through a residual current operated protector;
the device acquires the current electric energy monitoring parameters of the distributed photovoltaic power generation system through the electric energy metering device and sends the electric energy monitoring parameters to the intelligent electric meter component;
and the remote intelligent electronic switch adjusts the states of the alternating current contactor and the change-over switch based on the attribute of the electric energy monitoring parameter.
As a more specific example of the embodiments of fig. 1-2, reference may be made to the circuit diagram embodiments described with reference to fig. 3-4.
In specific implementation, the distributed photovoltaic remote control-based grid-connected and splitting device structurally comprises a photovoltaic solar panel assembly, a pole plate mounting support, a grid-connected circuit breaker, a string-type photovoltaic inverter, a distributed photovoltaic remote control grid-connected and splitting device, a photovoltaic metering device and a grid-connected isolating knife switch, wherein the photovoltaic solar panel assembly is arranged on a surface of a house with high sunlight receiving illumination intensity or on a mountain slope facing the sun according to local conditions through the mounting support, and the string-type inverter, the photovoltaic remote control grid-connected and splitting device and the metering device are close to a grid-connected point fixing wall body or a ground fixing base; the installation position must be well ventilated and radiated, the dryness and humidity are proper, and no corrosion exists; the distance from the ground reference is 1.8 meters, and the photovoltaic grid connection is convenient for splitting operation and equipment maintenance.
The alternating current contactor adopts a CJ-20-400A alternating current contactor, and the change-over switch realizes the function of remotely controlling a stop button or a start button of a grid-connected and splitting device.
Remote intelligent electronic switch accessible cell-phone APP remote control.
Next, the operation and action of the edge calculation unit in the above embodiment will be described in detail.
The edge calculation unit judges the stability of the radiation intensity based on the solar radiation intensity data, and specifically comprises the following steps:
composing the solar radiation intensity data included in the plurality of light intensity sensor data into a solar radiation intensity data matrix RI;
the edge calculation unit judges the radiation intensity stability based on the solar radiation intensity data matrix RI;
and taking the stability judgment result of the solar radiation intensity data matrix RI as the radiation intensity stability judgment result.
For convenience of introduction, it is assumed that M light intensity sensors L are arranged on the solar panel assembly of the distributed photovoltaic power generation system1，L2，…，LM；
The edge calculation unit collects the solar radiation intensity data detected by the M light intensity sensors according to the time period delta t, and a solar radiation intensity data matrix RI is formed as follows:
the edge calculation unit judges the radiation intensity stability based on the solar radiation intensity data matrix RI;
wherein R isijFor the intensity of solar radiation sent by the ith light intensity sensor to the edge calculation unit in the jth time period, i e [1, M ∈ [ ]],j∈[1,N]N is a preset control period parameter, and N is more than or equal to M.
If the M is equal to N, calculating a characteristic root of the solar radiation intensity data matrix RI;
and if the absolute values of all the characteristic roots are less than 1, stabilizing the solar radiation intensity data matrix RI.
If M < N, acquiring at least one M-order sub-matrix of the solar radiation intensity data matrix RI;
and if the absolute values of all characteristic roots of one M-order sub-matrix are less than 1, stabilizing the solar radiation intensity data matrix RI.
On this basis, the edge calculation unit performs radiation intensity stability judgment based on the solar radiation intensity data, and takes a result of the radiation intensity stability judgment as a part of the electric energy monitoring parameter, specifically including:
and if the radiation intensity is judged to be stable, acquiring other current electric energy monitoring parameters of the distributed photovoltaic power generation system through the electric energy metering device, wherein the other electric energy monitoring parameters comprise terminal voltage of the distributed photovoltaic power generation system.
Only when the radiation intensity is judged to be stable, the subsequent splitting and grid-connected control operation is started, and the safety of the power grid is further ensured.
On the basis of the above, fig. 5-6 respectively show control schematic diagrams for performing photovoltaic grid-connected power generation or splitting by using the device shown in fig. 1.
Reference is first made to fig. 5.
Based on the foregoing specific embodiments, the process of the device executing the photovoltaic grid-connected power generation may be summarized as follows:
when the electricity information acquisition system detects that the electric energy meter and the acquisition terminal upload detection data and the voltage intelligent monitoring platform system detects that the voltage of a distribution area is normal, the public power grid of the distribution area provides power to the intelligent electric energy meter through an open-type knife switch, a mobile phone is used for downloading a remote intelligent electronic switch APP and sending an open command, a photovoltaic remote control grid-connection and disconnection device acts, a CJ-20-400A alternating current contactor acts, a residual current action protector is connected, a power supply is operated actively, a primary three-phase four-wire system power supply of a string type photovoltaic inverter is connected, the photovoltaic inverter starts to operate, a solar component collecting plate is converged, and the voltage of a distribution area is normal, And collecting direct current and inverting the direct current into sinusoidal alternating current of 50HZ, and connecting the distributed photovoltaic power generation system to grid for power generation.
It should be noted that "CJ-20-400A ac contactor operates to pull in → turns on the power supply of the residual current operated protector to operate actively" and "turns on the primary three-phase four-wire system power supply of the string type photovoltaic inverter → the photovoltaic inverter starts to work" in fig. 5 belong to two parallel processes;
referring next to fig. 6, the process of the apparatus performing the splitting of the photovoltaic grid-connected system can be summarized as follows:
when an electricity information acquisition system detects the abnormity of the uploaded detection data of an electric energy meter and an acquisition terminal (grid-connected electric quantity exceeds the capacity generating capacity of a photovoltaic grid-connected contract) or a voltage intelligent monitoring platform system detects the abnormity of the voltage of a distribution station area (the overvoltage of the distribution station area caused by the photovoltaic grid-connected), a public power grid of the distribution station area provides power for an intelligent electric energy meter through an open type knife switch, a remote intelligent electronic switch APP is downloaded by a mobile phone to send a switching-off instruction, a photovoltaic remote control grid-connected and splitting device acts, a CJ-20-400A alternating current contactor acts to release, a residual current action protector power is disconnected, a primary three-phase four-wire power supply of a string-type photovoltaic inverter is switched off, and the photovoltaic inverter acts Stopping working, namely converging the polar plates of the solar assembly, collecting direct current, throwing away, separating the distributed photovoltaic power generation system from the low-voltage power grid, and stopping grid-connected power generation.
It should be noted that, in fig. 6, there is a sequence of four steps of "CJ-20-400A ac contactor action release", "residual current operated protector power off", "group string type primary three-phase four-wire system power off", and "pv inverter stop", as shown by the arrows in the figure specifically.
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that at least:
1. the device network connection is simple, and the modularization degree is high, and technical content (utilization power consumption information acquisition system, intelligent voltage detection system, cell-phone APP system) is higher.
2. The conversion operation of the distributed photovoltaic remote control grid connection and disconnection device is simple, convenient, rapid and practical.
3. The device utilizes the cell-phone real time management and control photovoltaic user and is incorporated into the power networks and the splitting, as long as there is GPS signal or big dipper satellite signal can remote control operation management and control.
4. The device can real-time detection control photovoltaic user operational aspect, stops photovoltaic user to increase the solar energy component polar plate privately and enlarges the generated energy, effectively avoids the power consumption condition of violating the contract to take place.
5. The method is based on the premise of local stability judgment of the edge computing unit, provides precondition for environment objectivity judgment and overall stability judgment of the power grid, and is not affected by human subjective factors.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A remote control grid connection and disconnection device based on distributed photovoltaic is connected to a public transformation public power grid system through an intelligent electric meter assembly and is used for carrying out remote grid connection and disconnection control on a distributed photovoltaic power generation system;
the method is characterized in that:
the distributed photovoltaic power generation system comprises a plurality of solar panel assemblies, wherein the plurality of solar panel assemblies are connected with a current collector assembly;
the collector assembly is connected to the string-type photovoltaic inverter through an air circuit breaker;
the device is connected to the string-type photovoltaic inverter through a residual current operated protector;
the device comprises an electric energy metering device, a remote intelligent electronic switch, an alternating current contactor and a change-over switch;
the device acquires the current electric energy monitoring parameters of the distributed photovoltaic power generation system through the electric energy metering device and sends the electric energy monitoring parameters to the intelligent electric meter component;
the remote intelligent electronic switch adjusts the states of the alternating current contactor and the change-over switch based on the attribute of the electric energy monitoring parameter;
the electric energy metering device comprises at least one edge computing unit, the edge computing unit is communicated with a light intensity sensor arranged on the solar polar plate component of the distributed photovoltaic power generation system and is used for acquiring data of a plurality of light intensity sensors, and the data of the light intensity sensors comprise solar radiation intensity data;
and the edge calculation unit judges the stability of the radiation intensity based on the solar radiation intensity data, and takes the judgment result of the stability of the radiation intensity as a part of the electric energy monitoring parameters.
2. The distributed photovoltaic remote control-based grid connection and disconnection device as claimed in claim 1, wherein:
the solar panel component of the distributed photovoltaic power generation system is provided with M light intensity sensors L1，L2，…，LM；
The edge calculation unit collects the solar radiation intensity data detected by the M light intensity sensors according to the time period delta t, and a solar radiation intensity data matrix RI is formed as follows:
the edge calculation unit judges the radiation intensity stability based on the solar radiation intensity data matrix RI;
wherein R isijFor the intensity of solar radiation sent by the ith light intensity sensor to the edge calculation unit in the jth time period, i e [1, M ∈ [ ]],j∈[1,N]N is a preset control period parameter, and N is more than or equal to M.
3. The distributed photovoltaic remote control based grid connection and disconnection device as claimed in claim 1 or 2, wherein:
the edge calculation unit performs radiation intensity stability judgment based on the solar radiation intensity data, and specifically includes:
composing the solar radiation intensity data included in the plurality of light intensity sensor data into a solar radiation intensity data matrix RI;
the edge calculation unit judges the radiation intensity stability based on the solar radiation intensity data matrix RI;
and taking the stability judgment result of the solar radiation intensity data matrix RI as the radiation intensity stability judgment result.
4. The distributed photovoltaic remote control-based grid connection and disconnection device as claimed in claim 2, wherein:
the edge calculation unit performs the radiation intensity stability judgment based on the solar radiation intensity data matrix RI, and specifically includes:
if the M is equal to N, calculating a characteristic root of the solar radiation intensity data matrix RI;
and if the absolute values of all the characteristic roots are less than 1, stabilizing the solar radiation intensity data matrix RI.
5. The distributed photovoltaic remote control-based grid connection and disconnection device as claimed in claim 2, wherein:
the edge calculation unit performs the radiation intensity stability judgment based on the solar radiation intensity data matrix RI, and specifically includes:
if M < N, acquiring at least one M-order sub-matrix of the solar radiation intensity data matrix RI;
and if the absolute values of all characteristic roots of one M-order sub-matrix are less than 1, stabilizing the solar radiation intensity data matrix RI.
6. The distributed photovoltaic remote control based grid connection and disconnection device as claimed in any one of claims 1, 2, 4 or 5, wherein:
the edge calculation unit performs radiation intensity stability judgment based on the solar radiation intensity data, and takes a result of the radiation intensity stability judgment as a part of the electric energy monitoring parameters, specifically including:
and if the radiation intensity is judged to be stable, acquiring other current electric energy monitoring parameters of the distributed photovoltaic power generation system through the electric energy metering device, wherein the other electric energy monitoring parameters comprise terminal voltage of the distributed photovoltaic power generation system.
7. The distributed photovoltaic remote control-based grid connection and disconnection device as claimed in claim 6, wherein:
and if the other electric energy monitoring parameters are normal, the public transformation public power grid system provides power for the intelligent electric energy meter component through an open type knife switch.
8. The distributed photovoltaic remote control-based grid connection and disconnection device as claimed in claim 7, wherein:
and if the other electric energy monitoring parameters are normal, the device starts the remote intelligent electronic switch.
9. The distributed photovoltaic remote control-based grid connection and disconnection device as claimed in claim 7 or 8, wherein:
and if the other electric energy monitoring parameters are normal, the device closes the action of the alternating current contactor in a suction mode.
10. The distributed photovoltaic remote control-based grid connection and disconnection device as claimed in claim 7 or 8, wherein:
and if the other electric energy monitoring parameters are abnormal, the device disconnects the remote intelligent electronic switch.
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| CN202211016661.4A CN115241924A (en) | 2021-01-26 | 2021-01-26 | Distributed photovoltaic solar radiation intensity stability judgment method |
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