CN115224742A - BIPV photovoltaic power generation convergence grid-connected system and method - Google Patents
BIPV photovoltaic power generation convergence grid-connected system and method 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
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S20/00—Supporting structures for PV modules
- H02S20/20—Supporting structures directly fixed to an immovable object
- H02S20/22—Supporting structures directly fixed to an immovable object specially adapted for buildings
- H02S20/23—Supporting structures directly fixed to an immovable object specially adapted for buildings specially adapted for roof structures
- H02S20/25—Roof tile elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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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 is suitable for the technical field of new energy, provides a BIPV photovoltaic power generation convergence grid-connected system and a method thereof, and solves the problem that the existing grid-connected system cannot perform timely pre-judgment and analysis on the power generation countercurrent effect, so that the power generation efficiency is reduced; the system comprises: the BIPV photovoltaic power station is used for collecting solar energy in a distributed mode, converting the solar energy into electric energy and connecting the converted electric energy into a current input circuit in parallel for grid connection; the module-level inverter is used for monitoring the operation parameters of the output port of the BIPV photovoltaic power station; the grid-connected service module is used for verifying and executing alternating current grid connection of the BIPV photovoltaic power station and a power grid; the grid-connected monitoring module is used for loading the operation parameter data sent by the component-level inverter in real time and calculating the real-time power generation reverse current value of the BIPV photovoltaic power station; the BIPV photovoltaic power station reverse-flow compensation system is provided with the module-level inverter, the module reverse-flow effect of the BIPV photovoltaic power station is eliminated in real time through the module-level inverter, reverse voltage compensation operation is carried out on the BIPV photovoltaic power station, and high-efficiency operation of the BIPV photovoltaic power generation convergence grid-connected system is guaranteed.
Description
Technical Field
The invention belongs to the technical field of new energy, and particularly relates to a BIPV photovoltaic power generation convergence grid-connected system and method.
Background
Building Integrated Photovoltaics (PV) is a technology for integrating solar power (Photovoltaic) products into buildings, and is different from the form of Building Attached Photovoltaic systems (BAPV) in which Building Integrated PV is divided into two major categories: one is the combination of a photovoltaic array and a building, and the other is the integration of the photovoltaic array and the building, such as a photovoltaic tile roof, a photovoltaic curtain wall, a photovoltaic daylighting roof and the like. In both of these approaches, the integration of photovoltaic arrays with buildings is a common form.
In the working process of a photovoltaic system, the power generation countercurrent effect is very obvious, the direct harm of the component countercurrent effect is that a large amount of charges are accumulated on the surface of a battery piece, the passivation effect of the surface of the battery is deteriorated, so that the filling factor, the open-circuit voltage and the short-circuit current of the battery piece are reduced, the overall output power of the photovoltaic component is attenuated, the power generation performance of the battery component is reduced due to the fact that the filling factor is more and more lost, the conductivity of a photovoltaic electric plate in the photovoltaic system is more and more poor, the maximum rate can reach 50% or even higher, the operation and maintenance burden is increased, the existing grid-connected system cannot carry out timely prejudgment and analysis on the power generation countercurrent effect, the power generation efficiency is reduced, and in order to solve the power generation countercurrent effect in the photovoltaic system, a BIPV power generation grid-connected system and a method are provided.
Disclosure of Invention
The invention provides a BIPV photovoltaic power generation convergence grid-connected system and a method thereof, aiming at solving the problem that the existing grid-connected system cannot perform timely prejudgment and analysis on the power generation countercurrent effect, so that the power generation efficiency is reduced.
In the working process of a photovoltaic system, a power generation countercurrent effect is very obvious, the direct harm of the component countercurrent effect is that a large amount of charges are accumulated on the surface of a battery piece, the passivation effect of the surface of the battery is deteriorated, so that the filling factor, open-circuit voltage and short-circuit current of the battery piece are reduced, the overall output power of a photovoltaic component is attenuated, the loss of the filling factor is more and more increased, the conductivity of a photovoltaic electric plate in the photovoltaic system is more and more poor, the power generation performance of the battery component is reduced, the maximum filling factor can reach 50% or even higher, the operation and maintenance burden is increased, the existing grid-connected system cannot perform timely prejudgment and analysis on the power generation countercurrent effect, the power generation efficiency is reduced, in order to solve the power generation countercurrent effect in the photovoltaic system, a BIPV power generation grid-connected system and a method are provided, the BIPV power generation countercurrent grid-connected system eliminates the component countercurrent effect of the BIPV power generation power station in real time through a BIPV power generation photovoltaic power station arranged on a building roof, and meanwhile, the BIPV power generation countercurrent grid-connected system is connected with a component-connected inverter for monitoring the operational parameters of the BIPV power generation countercurrent output port, and the BIPV power station, and the BIPV power generation countercurrent grid-connected system can be prevented from operating on the source.
The invention is realized in this way, a BIPV photovoltaic power generation confluence grid-connected system, the BIPV photovoltaic power generation confluence grid-connected system includes:
the BIPV photovoltaic power station is used for carrying out photovoltaic power generation, collecting solar energy in a distributed mode, converting the solar energy into electric energy, and connecting the converted electric energy into a current input circuit in parallel for grid connection;
the module-level inverter is connected with the BIPV photovoltaic power station in an access mode of one-to-n groups and is used for monitoring the operation parameters of the output port of the BIPV photovoltaic power station;
the input side of the grid-connected service module is electrically connected with a BIPV photovoltaic power station and used for verifying and executing alternating current grid connection of the BIPV photovoltaic power station and a power grid;
and the grid-connected monitoring module is used for loading the operation parameter data sent by the component-level inverter in real time, calculating the real-time power generation reverse flow value of the BIPV photovoltaic power station, judging whether the real-time power generation reverse flow value of the output port of the BIPV photovoltaic power station exceeds a preset threshold value, if not, feeding back a BIPV photovoltaic power generation reverse flow result, and if so, executing reverse flow compensation operation.
Preferably, the BIPV photovoltaic power plant comprises:
the system comprises at least one group of BIPV photovoltaic tiles, a module level inverter and a plurality of photovoltaic tiles, wherein the BIPV photovoltaic tiles are used for executing solar energy collection work, each group of BIPV photovoltaic tiles are electrically connected with the module level inverter through an inverter connecting wire, and the BIPV photovoltaic tiles are arranged on a building roof in a replacement or covering installation mode;
be used for the bearing the tile of BIPV photovoltaic tile holds the bracket, fixes on the building roof through rivet and self-tapping screw cooperation, and the tile holds and is provided with the tile heat preservation piece that is used for waterproof heat preservation on the bracket.
Preferably, the BIPV photovoltaic power plant further comprises:
and the wiring groove is arranged between the adjacent BIPV photovoltaic tiles and is used for layout and protection of the inverter connecting wire and the BIPV photovoltaic tile current input wire.
Preferably, the component level inverter includes:
the inverter host is used for acquiring a voltage value and a current value of an output port of the BIPV photovoltaic power station and operating parameters of the BIPV photovoltaic power station, analyzing and judging whether a power generation countercurrent effect exists in the corresponding BIPV photovoltaic power station or not, and generating a feedback instruction;
and the countercurrent effect elimination terminal acquires the feedback instruction of the inverter host, analyzes the feedback instruction and executes the countercurrent effect elimination instruction.
Preferably, the grid-connected service module includes:
exchange collection box, input side electric connection have multiunit BIPV photovoltaic power plant for with at least a set of subassembly level inverter and the BIPV photovoltaic power plant access that corresponds by the low pressure AC distribution electric network of BIPV photovoltaic power plant power supply.
Preferably, the grid-connected service module further includes:
the input side of the convergence grid-connected cabinet is electrically connected with a plurality of groups of alternating current convergence boxes, the multiple groups of alternating current convergence boxes are used for outputting the total current of the alternating current convergence boxes, and the multiple groups of alternating current convergence boxes exist in a BIPV photovoltaic power generation convergence grid-connected system.
Preferably, the grid-connected monitoring module includes:
the inverter signal processor is used for receiving the operation parameter data sent by the component-level inverter, loading the operation parameter data sent by the component-level inverter and calculating a real-time power generation reverse flow value of the BIPV photovoltaic power station based on the judgment result of the inverter host;
the compensation processing unit is used for acquiring a real-time power generation countercurrent value of the BIPV photovoltaic power station, sending the real-time power generation countercurrent value of the BIPV photovoltaic power station to the countercurrent effect elimination terminal, receiving an instruction by the countercurrent effect elimination terminal, determining a compensation value and a compensation period, and executing countercurrent effect elimination operation;
the compensation feedback unit is electrically connected with the compensation processing unit, is in communication connection with a reverse flow effect elimination terminal and is used for establishing connection with the component-level inverter so as to remotely monitor the operation state of the BIPV photovoltaic power station and the reverse flow effect compensation state;
and the power station early warning unit is electrically connected with the compensation feedback unit, receives a counter-current effect elimination result sent by the compensation feedback unit, tracks real-time information of the BIPV photovoltaic power station, sends out an alarm for other faults and generates an operation and maintenance report of the BIPV photovoltaic power station.
A BIPV photovoltaic power generation convergence grid-connected method based on the BIPV photovoltaic power generation convergence grid-connected system specifically comprises the following steps:
photovoltaic power generation is carried out, solar energy is collected in a distributed mode, the solar energy is converted into electric energy, and the converted electric energy is connected into a current input circuit in parallel and is connected to the grid;
connecting the BIPV photovoltaic power station in an access mode of one-to-n groups, and monitoring the operation parameters of an output port of the BIPV photovoltaic power station;
the BIPV photovoltaic power station is electrically connected with the verification module, and the alternating current synchronization of the BIPV photovoltaic power station and a power grid is verified and executed;
the method comprises the steps of loading operation parameter data sent by a component-level inverter in real time, calculating a real-time power generation reverse flow value of the BIPV photovoltaic power station, judging whether the real-time power generation reverse flow value of an output port of the BIPV photovoltaic power station exceeds a preset threshold value, feeding back a BIPV photovoltaic power generation reverse flow result if the real-time power generation reverse flow value of the output port of the BIPV photovoltaic power station exceeds the preset threshold value, and executing reverse flow compensation operation if the real-time power generation reverse flow value of the output port of the BIPV photovoltaic power station exceeds the preset threshold value.
Preferably, the method for judging whether the real-time power generation backflow value of the output port of the BIPV photovoltaic power station exceeds a preset threshold value, if not, feeding back a BIPV photovoltaic power generation backflow result, and if so, executing a backflow compensation operation specifically includes:
establishing communication connection with the countercurrent effect elimination terminal, and sending compensation data to the countercurrent effect elimination terminal, wherein the compensation data comprises BIPV photovoltaic tile addresses, compensation current values and compensation periods in the BIPV photovoltaic power station;
the countercurrent effect elimination terminal receives the compensation data, analyzes the compensation data, and selects random times or traverses the BIPV photovoltaic tile address in the BIPV photovoltaic power station;
selecting a compensation mode based on the analyzed compensation data, wherein the compensation mode is a parallel compensation mode and a night compensation mode;
if the parallel compensation mode is selected, calling a parallel compensation mode address model in the countercurrent effect elimination terminal, directly returning the BIPV photovoltaic tile address, and marking the used BIPV photovoltaic tile address;
if the night compensation mode is selected, a night compensation mode address model in the countercurrent effect elimination terminal is called, the inverter host related to the BIPV photovoltaic tile address and the related hardware capable of eliminating countercurrent are firstly returned, and the countercurrent effect elimination terminal selects a corresponding night compensation operation model according to the BIPV photovoltaic tile.
Compared with the prior art, the embodiment of the application mainly has the following beneficial effects:
the module-level inverter is arranged in the embodiment of the invention, the module countercurrent effect of the BIPV photovoltaic power station is eliminated in real time through the module-level inverter, and meanwhile, the module-level inverter can ensure that the direct-current side voltage of the BIPV photovoltaic power station is about 40V, so that the module countercurrent effect is avoided from the source, and meanwhile, when the module countercurrent effect is generated, reverse voltage supplementing operation is carried out on the BIPV photovoltaic power station through the judgment and analysis of the module-level inverter, so that the high-efficiency operation of the BIPV photovoltaic power generation convergence grid-connected system is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a BIPV photovoltaic power generation convergence grid-connected system provided by the invention.
Fig. 2 is a schematic structural diagram of a BIPV photovoltaic power plant provided by the present invention.
Fig. 3 is a schematic structural view of the alternative installation of the BIPV photovoltaic tiles provided by the present invention.
Fig. 4 is a schematic structural view of the BIPV photovoltaic tile overlay mounting provided by the present invention.
Fig. 5 is a schematic diagram of a component-level inverter according to the present invention.
Fig. 6 is a schematic implementation flow diagram of the method for determining the component reverse flow effect of the inverter main unit provided by the present invention.
Fig. 7 is a schematic structural diagram of a grid-connected service module provided by the present invention.
Fig. 8 is a schematic structural diagram of a grid-connected monitoring module provided by the present invention.
Fig. 9 is a schematic flow chart of the implementation of the BIPV photovoltaic power generation merging and grid-connecting method provided by the invention.
Fig. 10 is a schematic flow chart illustrating an implementation process of the method for determining whether the real-time power generation backflow value at the output port of the BIPV photovoltaic power station exceeds the preset threshold value.
In the figure: the system comprises a 100-BIPV photovoltaic power station, a 110-BIPV photovoltaic tile, a 120-tile support bracket, a 130-wiring slot, a 200-component level inverter, a 210-inverter host, a 220-countercurrent effect elimination terminal, a 300-grid-connected service module, a 310-alternating current bus box, a 320-bus-connected cabinet, a 400-grid-connected monitoring module, a 410-inverter signal processor, a 420-compensation processing unit, a 430-compensation feedback unit and a 440-power station early warning unit.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
In the working process of a photovoltaic system, the generation countercurrent effect is very obvious, the direct harm of the assembly countercurrent effect is that a large amount of charges are accumulated on the surface of a battery piece, the passivation effect of the surface of the battery is deteriorated, so that the filling factor, open-circuit voltage and short-circuit current of the battery piece are reduced, the overall output power of a photovoltaic assembly is attenuated, the loss of the filling factor is more and more, the conductivity of a photovoltaic electric plate in the photovoltaic system is more and more poor, the generation performance of the battery assembly is reduced, the maximum filling factor can reach 50% or even higher, the operation and maintenance burden is increased, the existing grid-connected system cannot perform timely prejudgment and analysis on the generation countercurrent effect, so that the generation efficiency is reduced, in order to solve the problem of the generation countercurrent effect in the photovoltaic system, a BIPV generation grid-connected system and a method are provided, the BIPV generation grid-connected system generates electricity through a BIPV power station 100 arranged on the roof of a building, meanwhile, the BIPV power station 100 is connected with an assembly-level inverter 200 for monitoring the operation parameters of an output port of the BIPV power station 100, the BIPV power station 100 is eliminated in real time through the assembly-level inverter 200, and the BIPV power generation countercurrent-connected system is prevented from running at the source of the BIPV power generation countercurrent inverter 100.
The embodiment of the invention provides a BIPV photovoltaic power generation convergence grid-connected system, as shown in FIG. 1, the BIPV photovoltaic power generation convergence grid-connected system comprises:
the BIPV photovoltaic power station 100 is used for photovoltaic power generation, collecting solar energy in a distributed mode, converting the solar energy into electric energy, and connecting the converted electric energy into a current input circuit in parallel for grid connection.
And the module-level inverter 200 is connected with the BIPV photovoltaic power station 100 in an access mode of one-to-n groups and is used for monitoring the operation parameters of the output port of the BIPV photovoltaic power station 100.
And the input side of the grid-connected service module 300 is electrically connected with the BIPV photovoltaic power station 100 and is used for verifying and executing alternating current grid connection between the BIPV photovoltaic power station 100 and a power grid.
And the grid-connected monitoring module 400 loads the operation parameter data sent by the component-level inverter 200 in real time, calculates the real-time power generation reverse flow value of the BIPV photovoltaic power station 100, judges whether the real-time power generation reverse flow value of the output port of the BIPV photovoltaic power station 100 exceeds a preset threshold value, feeds back a BIPV photovoltaic power generation reverse flow result if the real-time power generation reverse flow value of the output port of the BIPV photovoltaic power station 100 exceeds the preset threshold value, and executes reverse flow compensation operation if the real-time power generation reverse flow value of the output port of the BIPV photovoltaic power station exceeds the preset threshold value.
In this embodiment, module-level inverter 200 connects BIPV photovoltaic power plant 100 with the access mode of one dragging n group, exemplarily, n can be 2, 3, 4 or 6 to realize that one drags four three-phases, one drags two three-phases and is incorporated into the power networks and connect, and every group module-level inverter 200 realize monitoring and acquireing BIPV photovoltaic power plant 100 running state and parameter, BIPV photovoltaic power plant 100 that has carried module-level inverter 200 can show and reduce BIPV photovoltaic power plant 100 side output voltage, for traditional high-voltage output, can avoid the module effect of flowing against the current, stop direct current high pressure arc effect simultaneously.
The module-level inverter 200 is arranged in the embodiment of the invention, the module countercurrent effect of the BIPV photovoltaic power station 100 is eliminated in real time through the module-level inverter 200, and meanwhile, the module-level inverter 200 can ensure that the direct-current side voltage of the BIPV photovoltaic power station 100 is about 40V, so that the module countercurrent effect is eliminated from the source, and the high-efficiency operation of the BIPV photovoltaic power generation convergence grid-connected system is ensured.
In a further preferred embodiment of the present invention, as shown in fig. 2, the BIPV photovoltaic power plant 100 comprises:
at least one group of BIPV photovoltaic tiles 110, which are used for executing solar energy collection work, wherein each group of BIPV photovoltaic tiles 110 is electrically connected with the module-level inverter 200 through an inverter connecting wire, and the BIPV photovoltaic tiles 110 are arranged on the roof of a building in a replacement or covering installation mode;
the tile supporting bracket 120 is used for supporting the BIPV photovoltaic tile 110 and is fixed on a building roof through rivets and self-tapping screws in a matched mode, and a tile heat-insulating piece for water prevention and heat insulation is arranged on the tile supporting bracket 120;
a wiring slot 130 disposed between adjacent BIPV photovoltaic tiles 110 for layout and protection of the inverter connection wires and the current input wires of the BIPV photovoltaic tiles 110.
Illustratively, as shown in fig. 3, for the schematic illustration of the replaceable installation of the BIPV photovoltaic tiles 110, the replacement of the roof of the building is realized by splicing a plurality of groups of BIPV photovoltaic tiles 110 on a tile support bracket 120, and then fixing the tile support bracket 120 on the roof of the building through a rivet and self-tapping screw fitting, wherein the building can be a temporarily built color steel tile building, a capsule apartment building or an assembly building, the BIPV photovoltaic tiles 110 are fixed on the tile support bracket 120 through an insulating sealing strip and a snap fitting manner, and the tile support bracket 120 can be an "i" steel truss structure or an inverted "V" steel truss structure.
Illustratively, as shown in fig. 4, which is a schematic diagram of the installation of the BIPV photovoltaic tiles 110 in a covering manner, the covering of the roof of the building is achieved by splicing multiple sets of BIPV photovoltaic tiles 110 on a tile support bracket 120, and then fixing the tile support bracket 120 on the roof of the building through the cooperation of rivets and self-tapping screws.
Exemplarily, tile heat preservation piece is specifically for keeping warm sponge, heat preservation PVC board or rubber slab structure, not only can play heat retaining effect, can also play the effect of protection BIPV photovoltaic tile 110 simultaneously, and then prolongs BIPV photovoltaic tile 110's life, has avoided BIPV photovoltaic tile 110's damage.
In a further preferred embodiment of the present invention, as shown in fig. 5, the component-level inverter 200 is communicatively connected to the grid-connected monitoring module 400 by GSM or WiFi communication, and the component-level inverter 200 includes:
the inverter host 210 is configured to obtain a voltage value and a current value of an output port of the BIPV photovoltaic power station 100 and an operation parameter of the BIPV photovoltaic power station 100, analyze and judge whether a power generation reverse flow effect exists in the corresponding BIPV photovoltaic power station 100, and generate a feedback instruction;
the reverse flow effect eliminating terminal 220 obtains the feedback command of the inverter host 210, analyzes the feedback command, and executes the reverse flow effect eliminating command.
Illustratively, the reverse-flow effect eliminating terminal 220 is electrically connected to the inverter main unit 210.
In this embodiment, as shown in fig. 6, the embodiment of the present invention further discloses a method for determining a component reverse flow effect of the inverter main unit 210, where the method for determining a component reverse flow effect of the inverter main unit 210 specifically includes:
step S101, the inverter host 210 obtains a voltage value and a current value of the output port of the BIPV photovoltaic power station 100 and an operation parameter of the BIPV photovoltaic power station 100.
Step S102, a historical voltage mean value, a historical current mean value and a running parameter mean value of the BIPV photovoltaic power station 100 are obtained, and a voltage value and a current value of the output port of the BIPV photovoltaic power station 100, a historical voltage mean value and a historical current mean value of the running parameters of the BIPV photovoltaic power station 100 and the output port of the BIPV photovoltaic power station 100, and a BIPV photovoltaic power station 100 running parameter mean value mapping table are established.
Step S103, obtaining the traversal result, calculating a mean deviation ratio, generating an abnormal queue according to the deviation ratio, and searching the BIPV photovoltaic power station 100 corresponding to the queue unit by the calculation engine in the inverter host 210 according to the priority of the abnormal queue.
And step S104, judging whether the BIPV photovoltaic power station 100 has a component reverse flow effect or not based on a preset threshold value rule.
In a further preferred embodiment of the present invention, as shown in fig. 7, the grid-connected service module 300 includes:
the input side of the alternating current power distribution box 310 is electrically connected with a plurality of groups of BIPV photovoltaic power stations 100 and is used for connecting at least one group of module-level inverters 200 and the corresponding BIPV photovoltaic power stations 100 into a low-voltage alternating current power distribution grid supplied by the BIPV photovoltaic power stations 100;
the input side of the bus grid-connected cabinet 320 is electrically connected with a plurality of groups of alternating current bus boxes 310, the total output of the current of the alternating current bus boxes 310 exists in the BIPV photovoltaic power generation bus grid-connected system.
In this embodiment, the convergence grid-connected cabinet 320 has a GPRS function of 5G, can realize the remote WEB connection component-level inverter 200 without connecting a network, and has a function of changing device parameters through a network, checking data changes of the BIPV photovoltaic power station 100 in real time, and remotely downloading the BIPV photovoltaic power station 100, and the ac power distribution box 310 is an ac power distribution box 310 with 24 in and 1 out.
In a further preferred embodiment of the present invention, as shown in fig. 8, the grid-connected monitoring module 400 includes:
the inverter signal processor 410 is configured to receive the operation parameter data sent by the module-level inverter 200, load the operation parameter data sent by the module-level inverter 200, and calculate a real-time power generation reverse current value of the BIPV photovoltaic power station 100 based on a judgment result of the inverter host 210;
the compensation processing unit 420 is used for acquiring a real-time power generation reverse flow value of the BIPV photovoltaic power station 100, sending the real-time power generation reverse flow value of the BIPV photovoltaic power station 100 to the reverse flow effect elimination terminal 220, receiving an instruction by the reverse flow effect elimination terminal 220, determining a compensation value and a compensation period, and executing reverse flow effect elimination operation;
the compensation feedback unit 430 is electrically connected to the compensation processing unit 420, and is communicatively connected to the reverse current effect eliminating terminal 220, so as to remotely monitor the operation state and the reverse current effect compensation state of the BIPV photovoltaic power plant 100 by establishing connection with the module-level inverter 200.
And the power station early warning unit 440 is electrically connected with the compensation feedback unit 430, receives the counter-current effect elimination result sent by the compensation feedback unit 430, tracks the real-time information of the BIPV photovoltaic power station 100, gives an alarm to other faults, and generates an operation and maintenance report of the BIPV photovoltaic power station 100.
For example, in the present application, when the grid-connected monitoring module 400 is used to lay out the BIPV photovoltaic power station 100, only three steps are required to realize the networking monitoring, the inverter signal processor 410 sends a signal to establish a connection with the BIPV photovoltaic power station 100, a user can input basic information of the power station through a personal terminal or a monitoring terminal, and then the grid-connected monitoring module 400 automatically generates a monitoring layout design, so as to realize the networking monitoring of the BIPV photovoltaic power station 100.
Illustratively, the inverter signal processor 410 is used for realizing communication in a wireless DTU communication mode, the communication Saiwei 2.4G RF, the communication sampling frequency is 5min, the maximum connection BIPV photovoltaic electric tile number is 99 groups, meanwhile, the inverter signal processor 410 is fixed in a direct plug-in mode, and an LED display screen is embedded in the inverter signal processor 410 and used for displaying the working state.
The embodiment of the invention also provides a BIPV photovoltaic power generation convergence grid connection method, as shown in FIG. 9, the BIPV photovoltaic power generation convergence grid connection method specifically comprises the following steps:
step S1, executing a photovoltaic power generation instruction, collecting solar energy in a distributed mode, connecting the solar energy to a current input circuit in parallel, and converting the solar energy into electric energy to be connected to the grid.
And S2, connecting the BIPV photovoltaic power station 100 in an access mode of one-to-n groups, and monitoring the operation parameters of the output port of the BIPV photovoltaic power station 100.
And S3, electrically connecting the BIPV photovoltaic power station 100, and verifying and executing the alternating current grid connection of the BIPV photovoltaic power station 100 and a power grid.
And S4, loading the operation parameter data sent by the module-level inverter 200 in real time, calculating a real-time power generation reverse flow value of the BIPV photovoltaic power station 100, judging whether the real-time power generation reverse flow value of an output port of the BIPV photovoltaic power station 100 exceeds a preset threshold value, if not, feeding back a BIPV photovoltaic power generation reverse flow result, and if so, executing reverse flow compensation operation.
In this embodiment, the module-level inverter 200 is provided in the embodiment of the present invention, the module-level inverter 200 eliminates the module reverse-flow effect of the BIPV photovoltaic power station 100 in real time, and the module-level inverter 200 can ensure that the dc-side voltage of the BIPV photovoltaic power station 100 is about 40V, so as to stop the module reverse-flow effect from the source and ensure the efficient operation of the BIPV photovoltaic power generation convergence grid-connected system.
In a further preferred embodiment of the present invention, a method for determining whether a real-time power generation backflow value at an output port of the BIPV photovoltaic power station 100 exceeds a preset threshold value, if not, feeding back a BIPV photovoltaic power generation backflow result, if yes, performing a backflow compensation operation is further provided, as shown in fig. 10, where the method for determining whether the real-time power generation backflow value at the output port of the BIPV photovoltaic power station 100 exceeds the preset threshold value, if not, feeding back a BIPV photovoltaic power generation backflow result, if yes, performing a backflow compensation operation specifically includes:
step S201, establishing a communication connection with the reverse current effect eliminating terminal 220, and sending compensation data to the reverse current effect eliminating terminal 220, where the compensation data includes an address of the BIPV photovoltaic tile 110 in the BIPV photovoltaic power station 100, a compensation current value, and a compensation period.
Step S202, the reverse flow effect eliminating terminal 220 receives the compensation data, analyzes the compensation data, and the reverse flow effect eliminating terminal 220 selects a random number of times or selects to traverse the address of the BIPV photovoltaic tile 110 in the BIPV photovoltaic power plant 100.
And step S203, selecting a compensation mode based on the analyzed compensation data, wherein the compensation mode is a parallel compensation mode and a night compensation mode.
Step S204, if the parallel compensation mode is selected, calling a parallel compensation mode address model in the counter-current effect elimination terminal 220, directly returning to the address of the BIPV photovoltaic tile 110, and marking the address of the used BIPV photovoltaic tile 110.
Step S205, if the night compensation mode is selected, the night compensation mode address model in the adverse current effect elimination terminal 220 is called, the inverter host 210 associated with the address of the BIPV pv tile 110 and the associated hardware capable of eliminating the adverse current are returned first, and the adverse current effect elimination terminal 220 selects the corresponding night compensation operation model according to the BIPV pv tile 110.
It should be noted that, in the present application, the compensation mode is a parallel compensation mode and a night compensation mode, specifically, the parallel compensation mode or the night compensation mode needs to be selected, and is determined according to the analyzed compensation data, and if the analyzed compensation data is smaller than a preset threshold value, for example, 0.001, it indicates that the reverse flow effect is not obvious, the parallel compensation can be realized during daytime power generation, the component-level inverter 200 does not need to work at night, and if the analyzed compensation data is larger than the preset threshold value, for example, 0.001, it indicates that the reverse flow effect is obvious, and in order to ensure normal work, a large amount of conductive particle compensation needs to be performed at night.
In this embodiment, the sampling frequency of the repeater is 5 seconds at intervals, the communication mode is 2.4G RF, and the number of the single group connectable with the maximum BIPV photovoltaic power station 100 is 99 groups.
The embodiment of the invention also provides BIPV photovoltaic power generation convergence grid-connected computer equipment, which comprises a display screen, a memory, a processor and a computer program, wherein the memory stores the computer program, and when the computer program is executed by the processor, the processor executes the steps of the BIPV photovoltaic power generation convergence grid-connected method.
And executing a photovoltaic power generation instruction, collecting solar energy in a distributed mode, connecting the solar energy to a current input circuit in parallel, and converting the solar energy into electric energy to be connected to the grid.
And connecting the BIPV photovoltaic power station 100 in an access mode of one-to-n groups, and monitoring the operation parameters of the output port of the BIPV photovoltaic power station 100.
And the BIPV photovoltaic power station 100 is electrically connected, and the alternating current grid connection of the BIPV photovoltaic power station 100 and a power grid is verified and executed.
The method comprises the steps of loading operation parameter data sent by the component-level inverter 200 in real time, calculating a real-time power generation reverse flow value of the BIPV photovoltaic power station 100, judging whether the real-time power generation reverse flow value of an output port of the BIPV photovoltaic power station 100 exceeds a preset threshold value, feeding back a BIPV photovoltaic power generation reverse flow result if the real-time power generation reverse flow value of the output port of the BIPV photovoltaic power station 100 exceeds the preset threshold value, and executing reverse flow compensation operation if the real-time power generation reverse flow result of the BIPV photovoltaic power generation reverse flow value exceeds the preset threshold value.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like, which is the control center of the terminal equipment and connects the various parts of the entire user terminal using various interfaces and lines.
The memory may be used to store computer programs and/or modules, and the processor may implement various functions of the terminal device by operating or executing the computer programs and/or modules stored in the memory and calling data stored in the memory. The memory mainly comprises a storage program area and a storage data area, wherein the storage program area can store an operating system, application programs required by at least one function (such as an information acquisition template display function, a product information publishing function and the like) and the like; the storage data area can store data created according to the use of the BIPV photovoltaic power generation convergence grid-connected system (such as product information acquisition templates corresponding to different product types, product information required to be issued by different product providers, and the like). In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
In summary, the invention provides a BIPV photovoltaic power generation convergence grid-connected system, in the embodiment of the invention, the module-level inverter 200 is arranged, the module reverse-flow effect of the BIPV photovoltaic power station 100 is eliminated in real time through the module-level inverter 200, and meanwhile, the module-level inverter 200 can ensure that the direct-current side voltage of the BIPV photovoltaic power station 100 is about 40V, so that the module reverse-flow effect is eliminated from the source, and the high-efficiency operation of the BIPV photovoltaic power generation convergence grid-connected system is ensured.
It should be noted that, for simplicity of description, the above-mentioned embodiments are described as a series of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no acts or modules are necessarily required in the present disclosure.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the above-described division of the units is only one type of division of logical functions, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or communication connection may be an indirect coupling or communication connection between devices or units through some interfaces, and may be in a telecommunication or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above examples are only used to illustrate the technical solutions of the present invention, and do not limit the scope of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from these embodiments without making any inventive step, fall within the scope of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may still make various combinations, additions, deletions or other modifications of the features of the embodiments of the present invention according to the situation without conflict, so as to obtain different technical solutions without substantially departing from the spirit of the present invention, and these technical solutions also fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a BIPV photovoltaic power generation converges and is incorporated into power networks system which characterized in that, BIPV photovoltaic power generation converges and is incorporated into power networks system includes:
the BIPV photovoltaic power station is used for photovoltaic power generation, collecting solar energy in a distributed mode, converting the solar energy into electric energy, and connecting the converted electric energy into a current input circuit in parallel for grid connection;
the module-level inverter is connected with the BIPV photovoltaic power station in an access mode of one-to-n groups and is used for monitoring the operation parameters of the output port of the BIPV photovoltaic power station;
the input side of the grid-connected service module is electrically connected with a BIPV photovoltaic power station and used for verifying and executing alternating current grid connection of the BIPV photovoltaic power station and a power grid;
and the grid-connected monitoring module is used for loading the operation parameter data sent by the component-level inverter in real time, calculating the real-time power generation reverse flow value of the BIPV photovoltaic power station, judging whether the real-time power generation reverse flow value of the output port of the BIPV photovoltaic power station exceeds a preset threshold value, if not, feeding back a BIPV photovoltaic power generation reverse flow result, and if so, executing reverse flow compensation operation.
2. The BIPV photovoltaic power generation combined grid-connected system of claim 1, wherein the BIPV photovoltaic power plant comprises:
the BIPV photovoltaic tile is arranged on the roof of a building in a replaceable or covering installation mode;
be used for the bearing the tile of BIPV photovoltaic tile holds the bracket, fixes on the building roof through rivet and self tapping screw cooperation, and is provided with the tile heat preservation piece that is used for waterproof insulation on the tile holds the bracket.
3. The BIPV photovoltaic power generation bussing grid-connection system of claim 2, wherein the BIPV photovoltaic power plant further comprises:
the wiring groove of setting between adjacent BIPV photovoltaic tile for the overall arrangement and the protection of inverter connecting wire and BIPV photovoltaic tile current input line.
4. The BIPV photovoltaic power generation bussing system of claim 3, wherein the module-level inverter comprises:
the inverter host is used for acquiring a voltage value and a current value of an output port of the BIPV photovoltaic power station and operating parameters of the BIPV photovoltaic power station, analyzing and judging whether a power generation countercurrent effect exists in the corresponding BIPV photovoltaic power station or not, and generating a feedback instruction;
and the countercurrent effect elimination terminal acquires the feedback instruction of the inverter host, analyzes the feedback instruction and executes the countercurrent effect elimination instruction.
5. The BIPV photovoltaic power generation bussing grid-connection system of claim 4, wherein the grid-connection service module comprises:
exchange collection box, input side electric connection have multiunit BIPV photovoltaic power plant for with at least a set of subassembly level inverter and the BIPV photovoltaic power plant access that corresponds by the low pressure AC distribution electric network of BIPV photovoltaic power plant power supply.
6. The BIPV photovoltaic power generation convergence grid-connected system of any one of claims 1-5, wherein the grid-connected service module further comprises:
the input side of the convergence grid-connected cabinet is electrically connected with a plurality of groups of alternating current convergence boxes, the multiple groups of alternating current convergence boxes are used for outputting the total current of the alternating current convergence boxes, and the multiple groups of alternating current convergence boxes exist in a BIPV photovoltaic power generation convergence grid-connected system.
7. The BIPV photovoltaic power generation confluence network system of claim 6 wherein the network monitoring module comprises:
the inverter signal processor is used for receiving the operation parameter data sent by the component-level inverter, loading the operation parameter data sent by the component-level inverter, and calculating a real-time power generation reverse flow value of the BIPV photovoltaic power station based on the judgment result of the inverter host;
the compensation processing unit is used for acquiring a real-time power generation countercurrent value of the BIPV photovoltaic power station, sending the real-time power generation countercurrent value of the BIPV photovoltaic power station to the countercurrent effect elimination terminal, receiving an instruction by the countercurrent effect elimination terminal, determining a compensation value and a compensation period, and executing countercurrent effect elimination operation;
and the compensation feedback unit is electrically connected with the compensation processing unit, is in communication connection with a countercurrent effect elimination terminal and is used for establishing connection with the component-level inverter so as to remotely monitor the operation state of the BIPV photovoltaic power station and the countercurrent effect compensation state.
8. The BIPV photovoltaic power generation convergence grid-connected system of claim 7, wherein the grid-connected monitoring module further comprises:
and the power station early warning unit is electrically connected with the compensation feedback unit, receives a counter-current effect elimination result sent by the compensation feedback unit, tracks the real-time information of the BIPV photovoltaic power station, gives an alarm to other faults, and generates an operation and maintenance report of the BIPV photovoltaic power station.
9. The BIPV photovoltaic power generation convergence grid-connection method of the BIPV photovoltaic power generation convergence grid-connection system based on any one of claims 1 to 8 is characterized by specifically comprising the following steps:
photovoltaic power generation is carried out, solar energy is collected in a distributed mode, the solar energy is converted into electric energy, and the converted electric energy is connected into a current input circuit in parallel and is connected to the grid;
connecting the BIPV photovoltaic power station in an access mode of one-to-n groups, and monitoring the operation parameters of an output port of the BIPV photovoltaic power station;
the BIPV photovoltaic power station is electrically connected with the verification module, and the alternating current synchronization of the BIPV photovoltaic power station and a power grid is verified and executed;
the method comprises the steps of loading operation parameter data sent by a component-level inverter in real time, calculating a real-time power generation reverse flow value of the BIPV photovoltaic power station, judging whether the real-time power generation reverse flow value of an output port of the BIPV photovoltaic power station exceeds a preset threshold value, feeding back a BIPV photovoltaic power generation reverse flow result if the real-time power generation reverse flow value of the output port of the BIPV photovoltaic power station exceeds the preset threshold value, and executing reverse flow compensation operation if the real-time power generation reverse flow value of the output port of the BIPV photovoltaic power station exceeds the preset threshold value.
10. The BIPV photovoltaic power generation convergence grid-connection method of claim 9, wherein the method for judging whether a real-time power generation backflow value of an output port of the BIPV photovoltaic power station exceeds a preset threshold value, if not, feeding back a BIPV photovoltaic power generation backflow result, and if so, executing a backflow compensation operation specifically comprises:
establishing communication connection with the countercurrent effect elimination terminal, and sending compensation data to the countercurrent effect elimination terminal, wherein the compensation data comprises BIPV photovoltaic tile addresses, compensation current values and compensation periods in the BIPV photovoltaic power station;
the countercurrent effect elimination terminal receives the compensation data, analyzes the compensation data, and selects random times or traverses the BIPV photovoltaic tile address in the BIPV photovoltaic power station;
selecting a compensation mode based on the analyzed compensation data, wherein the compensation mode is a parallel compensation mode and a night compensation mode;
if the parallel compensation mode is selected, calling a parallel compensation mode address model in the countercurrent effect elimination terminal, directly returning the BIPV photovoltaic tile address, and marking the used BIPV photovoltaic tile address;
if the night compensation mode is selected, a night compensation mode address model in the countercurrent effect elimination terminal is called, the inverter host related to the BIPV photovoltaic tile address and the related hardware capable of eliminating countercurrent are firstly returned, and the countercurrent effect elimination terminal selects a corresponding night compensation operation model according to the BIPV photovoltaic tile.
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| US20200169219A1 (en) * | 2017-12-31 | 2020-05-28 | Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd. | Photovoltaic power plant and primary frequency modulation control method therefor |
| CN109600102A (en) * | 2018-12-29 | 2019-04-09 | 浙江太瓦科技有限公司 | A kind of photovoltaic tile horse and its installation method |
| CN111463830A (en) * | 2020-05-11 | 2020-07-28 | 阳光电源股份有限公司 | Local area power grid networking method and application system thereof |
| WO2022001262A1 (en) * | 2020-07-03 | 2022-01-06 | 石家庄科林电气股份有限公司 | Photovoltaic inverter-based power quality optimization method for distribution transformer area |
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