CN211908389U - Virtual power plant system for distributed photovoltaic power station - Google Patents
Virtual power plant system for distributed photovoltaic power station Download PDFInfo
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- CN211908389U CN211908389U CN202020542461.2U CN202020542461U CN211908389U CN 211908389 U CN211908389 U CN 211908389U CN 202020542461 U CN202020542461 U CN 202020542461U CN 211908389 U CN211908389 U CN 211908389U
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Abstract
The utility model discloses a virtual power plant system for distributing type photovoltaic power plant, this virtual power plant system includes: the photovoltaic group string comprises at least one distributed photovoltaic module; the converter is connected with the output end of the photovoltaic group string through the connector; the input end of the power distribution device is connected with the output end of the converter, the output end of the power distribution device is connected with the load, and the output end of the power distribution device is also connected with a public power grid through a grid-connected switch; and the control center is respectively connected with the power distribution device and the grid-connected switch. The utility model provides a less unstability of distributed photovoltaic power plant place platform district/regional within range load, and the problem that the power consumption plan is difficult to predict.
Description
Technical Field
The utility model relates to a distributed generation technical field, in particular to a virtual power plant system for distributed photovoltaic power plant.
Background
The development of distributed photovoltaic is expected to be the trend of the development of the photovoltaic industry in the future. However, the development of distributed photovoltaic is faced with the problems that the scale of a single project is small, the property rights are not uniform, the projects are distributed scattered, and after the permeability is improved, the impact is brought to the stability and the reliability of a power grid. Especially small distributed photovoltaic projects will be closer to urban load centers and the locations available for installation are generally scattered and limited, and future developments of distributed photovoltaics face problems of scale fragmentation and location decentralization.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a virtual power plant system for distributed photovoltaic power plant aims at solving the less unstability of distributed photovoltaic power plant place platform district/regional within range load, and the problem that the power consumption plan is difficult to predict.
In order to achieve the above object, the utility model provides a virtual power plant system for distributing type photovoltaic power plant, virtual power plant system includes:
a photovoltaic string comprising at least one distributed photovoltaic module;
the converter is connected with the output end of the photovoltaic group string through a connector;
the input end of the power distribution device is connected with the output end of the converter, the output end of the power distribution device is connected with a load, and the output end of the power distribution device is also connected with a public power grid through a grid-connected switch;
and the control center is respectively connected with the power distribution device and the grid-connected switch.
Optionally, the number of the photovoltaic string is multiple;
the converter is a string-type inverter, and the number of the string-type inverters corresponds to the number of the photovoltaic strings; each photovoltaic string is connected with one string-type inverter.
Optionally, the converter comprises a bus device and a centralized inverter;
the photovoltaic group strings are in a plurality, and the output ends of the photovoltaic group strings are connected with the centralized inverter through the confluence device.
Optionally, a plurality of photovoltaic strings are detachably and electrically connected with each other through a connector.
Optionally, the connector is any one of a Y-connector, a T-connector, a tee joint and a junction box.
Optionally, a plurality of the distributed photovoltaic modules are arranged in series to form a photovoltaic string.
Optionally, a plurality of photovoltaic strings are connected in parallel through a connector.
Optionally, the photovoltaic string comprises a first photovoltaic string and a second photovoltaic string; the number of the first photovoltaic group strings and the second photovoltaic group strings is multiple;
the converter comprises a group string type inverter and a centralized inverter;
the number of string inverters corresponds to the number of first photovoltaic strings; each first photovoltaic string is connected with one string-type inverter;
the converter further comprises a confluence device;
the output ends of the second photovoltaic string are connected with the centralized inverter through the confluence device.
Optionally, a plurality of the distributed photovoltaic modules are used for distributed installation in a plurality of room units of a building.
Optionally, each of the distributed photovoltaic modules on each floor of the building is arranged in series to form one photovoltaic string.
Optionally, each floor of the building corresponds to the distributed photovoltaic modules of the same room unit and is arranged in series to form the photovoltaic group string.
Optionally, the distributed photovoltaic modules of some of the building units in at least some of the floors of the building are arranged in series to form a string of said photovoltaic modules.
Optionally, the virtual power plant system for the distributed photovoltaic power station further includes a metering device, the number of the metering device corresponds to the number of the photovoltaic string, and the metering device is serially connected between the photovoltaic string and the converter.
Optionally, the virtual power plant system for the distributed photovoltaic power station further comprises an energy storage device, and the energy storage device and the photovoltaic group are arranged in series-parallel connection
Optionally, a DC/DC converter and a storage battery are arranged in the energy storage device, and the DC/DC converter is configured to output the electric energy output by the distributed photovoltaic module to the storage battery for storage.
The utility model discloses with each distributed photovoltaic module concatenate in the distributed power station constitute a photovoltaic group cluster back together, turn into each distributed photovoltaic module the electric energy and export to the converter through connecting device to make the converter in unison export distribution device after the electric energy that produces each distributed photovoltaic module after changeing, distribution device exports the electric energy to each load again, and/or export the electric energy to public electric wire netting after being connected through the switch that is incorporated into the power networks with public electric wire netting. The utility model provides a less unstability of distributed photovoltaic power plant place platform district/regional within range load, and the problem that the power consumption plan is difficult to predict. The utility model discloses the virtual power plant system that polymerization distributing type photovoltaic power plant formed who founds owing to can not receive the influence that individual resource inserts and withdraws from the system and the physical environment position that locates changes, can realize the maximize of the utilization ratio of distributed resource, and through founding virtual power plant system, resource intensification, the scale that can realize help assisting distributing type photovoltaic resource centralized management. The utility model discloses a virtual power plant's polymerization form is solved the problem of being incorporated into the power networks of distributed power station, can avoid adopting the more complicated, the more high little microgrid system of cost of technique.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a virtual power plant system for distributed photovoltaic power plants of the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of a virtual power plant system for distributed photovoltaic power plants according to the present invention;
FIG. 3 is a schematic structural diagram of another embodiment of a virtual power plant system for distributed photovoltaic power plants according to the present invention;
figure 4 is the utility model discloses a structural schematic of a virtual power plant system of distributing type photovoltaic power plant still another embodiment.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Photovoltaic string | K1 | Grid-connected |
| 20 | |
100 | Load(s) |
| 30 | |
200 | |
| 40 | |
11 | Distributed |
| 50 | |
60 | Energy storage device |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The utility model provides a virtual power plant system for distributing type photovoltaic power plant.
Technical research aiming at popularization of distributed photovoltaic power stations is continuously carried out, but research contents are basically limited to a single form of direct grid connection based on each small distributed power station project (such as balcony power stations), related technical schemes and application scenes are basically explored to follow and move related schemes of large power stations, and the form has two characteristics: 1. on a scale, the system consists of 'small photovoltaic + small energy storage + small load' of each independent property unit; 2. in the aspect of control, a traditional power station direct grid connection and extensive strategy without control is mostly adopted, or a micro-grid structure is considered. But the load in the area/region range of the distributed photovoltaic power station is unstable, and the power utilization plan is difficult to predict; if it is expensive to separately configure a small-scale energy storage system in order to achieve the control effect of the microgrid, and the locations available for installation are generally scattered and limited, the future development of distributed photovoltaic systems faces the problems of fragmentation on scale and decentralization on locations.
The utility model provides a virtual power plant system for distributing type photovoltaic power plant.
Referring to fig. 1 to 4, in an embodiment of the present invention, the virtual power plant system includes:
a photovoltaic string 10, said photovoltaic string 10 comprising at least one distributed photovoltaic module 11;
the converter 20 is connected with the output end of the photovoltaic string 10 through a connector;
the input end of the power distribution device 30 is connected with the output end of the converter 20, the output end of the power distribution device 30 is connected with a load 100, and the output end of the power distribution device 30 is also connected with a public power grid 200 through a grid-connected switch K1;
and the control center 70 is connected with the power distribution device 30 and the grid-connected switch K1 respectively.
In this embodiment, the photovoltaic string 10 is formed by distributed photovoltaic modules 11 arranged in each distributed power station, and each distributed photovoltaic module 11 converts solar energy into electric energy, and the electric energy can be sent to a storage battery for storage and can also be used for pushing a load to work. Wherein the distributed photovoltaic module 11 is arranged on the roof of a building or on a balcony of a home. In practical application, the photovoltaic string 10 is formed by connecting a plurality of solar distributed photovoltaic modules 11 in series. The present embodiment can set the number of the distributed photovoltaic modules 11 according to the requirement, so as to form the photovoltaic string 10 with different voltages in series. By the arrangement, the distributed power stations can be distributed in different places, for example, the distributed photovoltaic modules 11 of each user house unit are connected in series and then aggregated, and then are output after being subjected to inversion and current transformation processing in a centralized manner.
The converter 20 may be a photovoltaic inverter, and functions to invert the dc power output by the photovoltaic string 10 into ac power to drive a load to work, or be incorporated into a utility grid. The inverter determines whether to start operation according to the input direct current voltage value. In some embodiments, the inverter can be further divided into a high-voltage operation mode and a low-voltage operation mode according to the level of the electric energy when the inverter satisfies the starting voltage. Wherein, the starting voltage is the lowest direct current voltage for starting the inverter to work, such as 20V; the high-voltage working mode is a mode in which the inverter works efficiently when the electric energy output by the distributed photovoltaic module 11 is high; the low-voltage operation mode is a mode in which the inverter operates inefficiently when the electric energy output by the distributed photovoltaic module 11 is low. The direct current output by the photovoltaic string 10 directly enters the inverter, because the photovoltaic string 10 is greatly influenced by the sunlight, the direct current voltage value output by the photovoltaic string 10 is lower in the morning and at the evening when the sunlight is weak, so that the working efficiency of the inverter is in a low-efficiency working interval, and the direct current voltage output by the photovoltaic string 10 is higher in the daytime when the sunlight is strong, so that the working efficiency of the inverter is higher. The connection device 40 may be any one of a Y-connector, a T-connector, and a three-way joint.
The power distribution device 30 is used for transmitting and redistributing the electric energy output by the converter 20 during normal operation, and cutting off the fault part to restore operation in case of fault. The power distribution device 30 may be provided with secondary devices such as a circuit breaker, a disconnector, a reactor, a lightning arrester, a voltage transformer, a capacitor, a cable, and a measuring instrument. The power distribution device 30 may output the electric power output by the inverter to each user side or output the electric power output by the inverter to the utility grid 200 according to the application requirement. The system's virtual plant control center 70 may be located at the location of the distribution room where the distribution devices and grid-tie switches are located. It can be understood that the main content in this embodiment relates to a virtual power plant system architecture of a distributed photovoltaic power station, a person skilled in the art may determine the structure and the working mode of the control center 70 according to the prior art, and the control center 70 is further integrated with control software, and details of a host inside the control center 70 and the control software installed therein and the like are also not described herein.
The utility model discloses after each distributed photovoltaic module 11 concatenates in the distributed power station and constitutes a photovoltaic group cluster 10, turn into each distributed photovoltaic module 11 the electric energy and export to converter 20 through connecting device 40, so that converter 20 is unified to export to distribution device 30 after the electric energy that produces each distributed photovoltaic module 11 is converted to current, distribution device 30 exports the electric energy to each load 100 again, and/or export the electric energy to public electric wire netting 200 after being connected through the switch that is incorporated into the power networks with public electric wire netting 200. The utility model provides a less unstability of distributed photovoltaic power plant place platform district/regional within range load, and the problem that the power consumption plan is difficult to predict. The utility model discloses the virtual power plant system that polymerization distributing type photovoltaic power plant that founds formed, the form that adopts virtual power plant integrates a plurality of small-size distributing type photovoltaic power plants, be favorable to promoting the large tracts of land popularization (reducing logic and connecting the points, reduce electric once-and-twice design complexity) of distributing type photovoltaic power generation technique from the technique, especially in population intensive, the urban area that the load is concentrated, the biggest realization is from using oneself on the spot, because can not receive the access of individual resource and withdraw from the system, and the influence of the physical environment position change that locates, can realize the maximize of the utilization ratio of distributing type resource, and through founding virtual power plant system, the resource intensification that can realize, the scale, help assisting distributing type photovoltaic resource centralized management. The utility model discloses a virtual power plant's polymerization form is solved the problem of being incorporated into the power networks of distributed power station, can avoid adopting the more complicated, the more high little microgrid system of cost of technique.
It can be understood that, the utility model discloses distributed photovoltaic power plant's virtual power plant system is on structural scheme, to distributed photovoltaic power plant's actual conditions, abandon and adopt the direct grid-connected or independent little microgrid form of single-point to each distributed power plant is the unit, take and directly utilize or the split after the recombination dual mode, directly integrate to distributed photovoltaic resource, form suitable group cluster form in accordance with local conditions, avoided doing complicated customization design to the special case of each property right unit, thereby simplify system architecture, the lifting system realizability.
Referring to fig. 1 to 4, in an embodiment, the number of the photovoltaic strings 10 is multiple (1# -N #);
each of the photovoltaic strings 10 is connected to one of the string inverters 210. And/or the number of the photovoltaic string 10 is multiple, and the output ends of the multiple photovoltaic strings 10 are connected with the centralized inverter 222 through the bus device 221.
In this embodiment, a string inverter 210 may be connected between each photovoltaic string 10, and the string inverter 210 is used to convert current to one photovoltaic string 10. Thus, the voltage supplied to each inverter by the strings of pv strings 10 is the sum of the voltages of the two strings of pv strings 10, and the current is the current of the single string of pv strings 10. The photovoltaic string 10 may be converged by the converging device 221 to output the same inverter. The output voltage of the multi-string photovoltaic string 10 is consistent with the output voltage of the single-string solar photovoltaic string 10. In the scheme of adopting the confluence device 221 to perform current transformation in a confluence mode, the number of the direct-current cables of the photovoltaic string 10 can be effectively reduced, the cost of the direct-current cables of the photovoltaic string 10 is reduced, the workload of wiring the direct-current cables of the photovoltaic string 10 in a photovoltaic project can be greatly reduced, and the fixation and arrangement of the direct-current cables of the photovoltaic string 10 and the later operation and maintenance work are facilitated. The utility model discloses as required, both can carry out not changing the lug connection to the electric wire netting in the distributed power station group cluster and also can carry out the contravariant to close after uniting the confluence to the group cluster in a plurality of distributed power stations again.
According to the configuration situation of each distributed group string in the virtual power plant, the configuration of the corresponding inverter can also be considered to adopt a centralized or group string form. When each photovoltaic string 10 is separately arranged, the converter 20 is a string inverter 210, one string inverter 210 may be connected between each photovoltaic string 10, and the number of the string inverters 210 corresponds to the number of the photovoltaic strings 10; when the converter performs current conversion by adopting a bus mode, the converter 20 includes a bus device 221 and a centralized inverter 222, and the electric energy is output to the centralized inverter 222 after being subjected to bus by the bus device 221. The utility model discloses can flow in the multiunit cluster respectively, can also adopt the unified energy storage system of direct configuration to regulate and control after converging simultaneously. The utility model discloses both simplified the complexity of configuration different capacity energy storage system when adopting each independent little microgrid scheme, realized the technique to energy storage system utilization ratio after the configuration is unified again. Meanwhile, economic benefits can be maximized, and the production cost of the distributed photovoltaic power station is further reduced. The grid-connected problem of the distributed power station is solved by adopting a virtual power plant aggregation mode, and a small microgrid system with more complex technology and higher cost can be avoided. Meanwhile, the cost of other devices (such as energy storage) configured in the system is easier to control, and the technical flexibility is greatly improved (for example, each combined string can adopt a string inverter, and can also adopt a centralized inverter after confluence, so that the selection range is wider, and the system cost is further reduced).
The utility model discloses abandon and adopt the direct grid-connected or independent little microgrid form of single-point to each distributed power station is the unit, takes direct utilization or the reassembling dual mode behind the split, and the dc-to-ac converter of corresponding configuration can be considered to adopt and concentrate or organize the cluster form, has realized simplifying, optimizing as far as possible in the technique. On the basis of a control scheme and a plurality of groups of strings, a unified energy storage system is directly configured for regulation and control after confluence. Compared with other schemes, the complexity of configuring energy storage systems with different capacities when each independent small microgrid scheme is adopted is simplified, and the maximization of the technical and economic benefits of the utilization rate of the energy storage systems after the unified configuration is realized, so that the investment cost of the distributed photovoltaic power station is further reduced.
Referring to fig. 1 to 4, in an embodiment, a plurality of photovoltaic strings 10 are detachably connected by a connector (not shown).
In this embodiment, a plurality of the photovoltaic string 10 form a distributed power station, in this embodiment, three distributed power stations are taken as an example, the three distributed power stations are respectively marked as 610, 620 and 630, and the distributed power stations 610 and 620 are electrically connected detachably through connectors. The groups in the distributed power stations are split and then cascaded to meet specific requirements matched with equipment such as relevant site conditions, power station rights, inverters and the like when a virtual power plant system is formed. In addition, when the distributed power station needs to be disconnected, the connectors can be disconnected, and then a part of the distributed power station can be disconnected. Wherein the connector may be a junction box; between each pv string 10, for example, the nth pv string 10 and the (N + 1) th pv string 10 are respectively connected to a junction box. The photovoltaic string comprises a first photovoltaic string (610) and a second photovoltaic string (620, 630); the number of the first photovoltaic group string (610) and the second photovoltaic group string (620, 630) is multiple;
the converter includes a string inverter 210 and a centralized inverter 222;
the number of string inverters 210 corresponds to the number of first photovoltaic strings (610); each of the first pv strings is connected to one of the string inverters 210;
the converter further comprises a bus device 221;
the output ends of the second photovoltaic strings are connected to the centralized inverter 222 via the bus device 221.
Referring to fig. 1 to 4, in one embodiment, a plurality of the distributed photovoltaic modules 11 are used for distributed installation in a plurality of building units of a building. Each building comprises a plurality of floors (1-3), and each floor comprises a plurality of house units (1-n); the distributed photovoltaic modules 11 are correspondingly arranged at the positions of the room units.
The distributed photovoltaic modules 11 of each floor are arranged in series to form a photovoltaic string 10 (1# in fig. 4). That is, the distributed photovoltaic modules 11 of the same photovoltaic string 10 are connected in series and used for a plurality of room units on the same floor.
Alternatively, the distributed photovoltaic modules 11 of each floor corresponding to the same room unit are arranged in series to form one photovoltaic string 10 (2 # in fig. 4). That is, the distributed photovoltaic modules of the same photovoltaic string 10 are connected in series and used for a plurality of room units on the same floor.
Alternatively, the distributed photovoltaic modules 11 of some of the building units in at least some of the floors of the building are arranged in series to form one of said photovoltaic string 10 (N # in fig. 4). That is, some of the room units in the distributed photovoltaic modules 11 of some or all of the floors may be arranged in series to form one photovoltaic string 10. Or some or all of the building units of some of the floors can be arranged in series to form a photovoltaic string 10.
In this embodiment, the photovoltaic string 10 may be installed on a building such as a residential building or an office building, and may be specifically installed on a balcony of the building, and the distributed photovoltaic module 11 is installed outside the balcony through a bracket, and may directly receive sunlight irradiation. Aiming at the characteristics of large quantity of independent components and dispersed property rights in a building photovoltaic system in a distributed power station, the connection form of each group string is more various. For example, a transverse connection method based on a floor, a longitudinal connection method based on a room unit, or a hybrid connection method based on both a floor and a room unit is flexibly adopted according to a room unit and a floor of a residential building. The selection of all connection modes can be planned according to the standards for reducing the mismatch loss of the group strings and facilitating the coordination management of all the components or the group string owners. After the distributed photovoltaic modules 11 in the building are formed into strings, the strings may be converted by the string inverters 210, and then connected to the grid or output to the load 100 through the power distribution device 30. Or the energy output by each group of strings can be converged and then subjected to inversion and current transformation. The utility model discloses can use each distributed power station as the house unit, take and directly utilize or the split back recombination dual mode, directly integrate to distributed photovoltaic resource, form suitable cluster form in accordance with local conditions, avoid doing complicated customization design to the special case of each property right house unit to simplified system structure, lift system realizability.
For the most representative building distributed photovoltaic system, the string form can be longitudinally, transversely or in hybrid series according to the requirement. Correspondingly, the configured inverter can also be considered to adopt a centralized or group string form, so that the technical simplification and optimization are realized as much as possible; the problems that distributed power stations, particularly distributed photovoltaic property rights of buildings are dispersed and not unified, and assets are difficult to profit in the period of low-price internet surfing are solved. The resources are divided into a whole, and the competitive price advantage and the scale benefit of the power generation resources are favorably realized. The property owner of the distributed photovoltaic power station transfers the balcony power station to a virtual power plant agent for hosting, and the agent is responsible for daily operation and maintenance without paying attention to the problems of technology and income, so that the assets are safer and more reliable; distributed resources of a virtual power plant agent of the distributed photovoltaic power station participate in electric power market transaction, so that the friendliness of the distributed resources to a power grid is facilitated, meanwhile, agent income can be obtained, and the sustainability of business is guaranteed;
referring to fig. 1 to 4, in an embodiment, the virtual power plant system for a distributed photovoltaic power plant further includes metering devices 50, the number of the metering devices 50 corresponds to the number of the photovoltaic string 10, and the metering devices 50 are arranged in series between the photovoltaic string 10 and the converter 20.
An independent metering device 50, namely an electricity meter, is arranged at the output end of each photovoltaic string 10, and the electricity meter is used for metering the generated energy of the single string for later analysis and comparison.
Referring to fig. 1 to 4, in an embodiment, the virtual power plant system for a distributed photovoltaic power plant further includes an energy storage device 60, and the energy storage device 60 is disposed in parallel with the photovoltaic string 10.
In this embodiment, the energy storage device 60 is connected in parallel with each photovoltaic string 10, and a DC/DC converter and a storage battery are disposed in the energy storage device 60, so that the electric energy output by the distributed photovoltaic modules 11 may be output to the storage battery for storage, or the stored electric energy may be subjected to inversion and conversion by the converter 20 and then output to the load 100 or the public power grid 200 through the power distribution device 30. The lead-acid storage battery can be adopted as the storage battery in the solar photovoltaic system. The accumulator may be sealed lead-acid accumulator regulated with deep discharge valve and deep discharge air sucking lead-acid accumulator. The utility model discloses direct configuration unified energy storage equipment 60 regulates and control after converging. Compared with other schemes, the complexity of configuring the energy storage devices 60 with different capacities when each independent small microgrid scheme is adopted is simplified, and the technical and economic benefits of the utilization rate of the energy storage devices 60 after the configuration is unified are maximized, so that the investment cost of the distributed photovoltaic power station is further reduced.
The above is only the optional embodiment of the present invention, and not therefore the limit of the patent scope of the present invention, all of which are in the concept of the present invention, the equivalent structure transformation of the content of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (10)
1. A virtual power plant system for a distributed photovoltaic power plant, the virtual power plant system comprising:
a photovoltaic string comprising at least one distributed photovoltaic module;
the converter is connected with the output end of the photovoltaic group string through a connector;
the input end of the power distribution device is connected with the output end of the converter, the output end of the power distribution device is connected with a load, and the output end of the power distribution device is also connected with a public power grid through a grid-connected switch;
and the control center is respectively connected with the power distribution device and the grid-connected switch.
2. The virtual power plant system for distributed photovoltaic power plants of claim 1, wherein the number of photovoltaic strings is plural;
the converter is a string-type inverter, and the number of the string-type inverters corresponds to the number of the photovoltaic strings; each photovoltaic string is connected with one string-type inverter.
3. The virtual power plant system for distributed photovoltaic power plants according to claim 1, characterized in that said converter comprises a junction device and a centralized inverter;
the photovoltaic group strings are in a plurality, and the output ends of the photovoltaic group strings are connected with the centralized inverter through the confluence device.
4. The virtual power plant system for distributed photovoltaic power plants of claim 3, wherein a plurality of the photovoltaic strings are removably electrically connected by connectors.
5. The virtual power plant system for distributed photovoltaic power plants of claim 4, wherein the connector is any one of a Y-connector, a T-connector, a tee, and a junction box.
6. The virtual power plant system for distributed photovoltaic power plants of claim 1, wherein a plurality of the photovoltaic strings are connected in parallel by connectors.
7. The virtual power plant system for distributed photovoltaic power plants of claim 1, wherein the strings of photovoltaic groups comprise a first string of photovoltaic groups and a second string of photovoltaic groups; the number of the first photovoltaic group strings and the second photovoltaic group strings is multiple;
the converter comprises a group string type inverter and a centralized inverter;
the number of string inverters corresponds to the number of first photovoltaic strings; each first photovoltaic string is connected with one string-type inverter;
the converter further comprises a confluence device;
the output ends of the second photovoltaic string are connected with the centralized inverter through the confluence device.
8. The virtual power plant system for distributed photovoltaic power plants of any of claims 1 to 7, further comprising metering devices corresponding in number to the number of photovoltaic strings, the metering devices being arranged in series between the photovoltaic strings and the converter.
9. The virtual power plant system for distributed photovoltaic power plants of any of claims 1 to 7, further comprising an energy storage device disposed in series-parallel with the photovoltaic banks.
10. The virtual power plant system for distributed photovoltaic power plants according to claim 9, characterized in that a DC/DC converter and a storage battery are arranged in the energy storage device, and the DC/DC converter is used for outputting the electric energy output by the distributed photovoltaic components to the storage battery for storage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN115663906A (en) * | 2022-12-26 | 2023-01-31 | 安徽大恒新能源技术有限公司 | Household power station based on micro-unit system |
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| CN115663906A (en) * | 2022-12-26 | 2023-01-31 | 安徽大恒新能源技术有限公司 | Household power station based on micro-unit system |
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Address after: 230088 6th floor, R & D center building, no.1699 Xiyou Road, high tech Zone, Hefei City, Anhui Province Patentee after: Sunshine New Energy Development Co.,Ltd. Address before: 230088 6th floor, R & D center building, no.1699 Xiyou Road, high tech Zone, Hefei City, Anhui Province Patentee before: Sunshine New Energy Development Co.,Ltd. Address after: 230088 6th floor, R & D center building, no.1699 Xiyou Road, high tech Zone, Hefei City, Anhui Province Patentee after: Sunshine New Energy Development Co.,Ltd. Address before: 230088 6th floor, R & D center building, no.1699 Xiyou Road, high tech Zone, Hefei City, Anhui Province Patentee before: HEFEI SUNGROW RENEWABLE ENERGY SCI. & TECH. Co.,Ltd. |
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