CN117154830A - Integration of photovoltaic grid-connected inverter and photovoltaic module - Google Patents
Integration of photovoltaic grid-connected inverter and photovoltaic module Download PDFInfo
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- CN117154830A CN117154830A CN202311391721.5A CN202311391721A CN117154830A CN 117154830 A CN117154830 A CN 117154830A CN 202311391721 A CN202311391721 A CN 202311391721A CN 117154830 A CN117154830 A CN 117154830A
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- inverter
- circuit
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- circuit board
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- 230000010354 integration Effects 0.000 title claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 22
- 238000004806 packaging method and process Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 7
- 238000004382 potting Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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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
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention belongs to the technical field of photovoltaic inverters, and provides an integration of a photovoltaic grid-connected inverter and a photovoltaic module, which comprises the following steps: grid-connected switch, sampling circuit and control circuit; the inverter circuit converts the input direct current into output alternating current; the grid-connected switch is arranged between the inverter circuit and the output end and used for controlling the connection between the inverter circuit and a power grid; the sampling circuit is used for collecting power grid parameters of a power grid; the control circuit is connected with the sampling circuit and is used for controlling the opening or closing of the grid-connected switch according to the change of the power grid parameters; the grid-connected switch and the inverter circuit are distributed independently, and the grid-connected switch and the inverter circuit are suitable for being detached and replaced under the condition that the inverter circuit or the packaging of the inverter circuit is not damaged. When the grid-connected switch is damaged due to the service life, the grid-connected switch can be independently detached from the photovoltaic grid-connected inverter for replacement, and the problem that the whole photovoltaic grid-connected inverter is damaged and cannot be used normally when the grid-connected switch is damaged is effectively solved.
Description
Technical Field
The invention belongs to the technical field of photovoltaic inverters, and particularly relates to integration of a photovoltaic grid-connected inverter and a photovoltaic module.
Background
The photovoltaic grid-connected inverter generally comprises an inverter circuit, a controller, a relay and a direct current auxiliary source, wherein the direct current auxiliary source is used for supplying power to the controller. The relay is used for disconnecting the photovoltaic power supply from the power grid when the power grid is abnormal, namely, the connection and disconnection of the grid-connected inverter from the power grid are realized by controlling the connection and disconnection of the relay. In a traditional photovoltaic grid-connected inverter, an inverter circuit, a controller, a relay and a direct current auxiliary source are generally integrated on a circuit board or integrated together with a certain part of circuits, or packaged together, so that the relay cannot be independently detached and installed, wherein the relay is generally arranged on an alternating current side of the grid-connected inverter. However, the relay is a mechanical switch, the switching times of the relay are limited, and when the relay is damaged, the whole photovoltaic grid-connected inverter is damaged, so that the photovoltaic grid-connected inverter cannot be used normally.
Disclosure of Invention
In view of the above, the present invention provides a photovoltaic grid-connected inverter, which aims to solve the above technical problems.
The invention provides a photovoltaic grid-connected inverter, which comprises:
an input adapted to connect to a photovoltaic module;
an output adapted to connect to a power grid;
an inverter circuit configured to receive direct current from one or more of the photovoltaic modules and convert the input direct current into output alternating current;
a grid-connected switch provided between the inverter circuit and the output terminal, for controlling connection of the inverter circuit to the power grid;
a sampling circuit configured to acquire grid parameters of the grid;
the control circuit is connected with the sampling circuit and is used for controlling the opening or closing of the grid-connected switch according to the change of the power grid parameters; wherein,
the grid-connected switch and the inverter circuit are distributed independently, and are suitable for carrying out disassembly and replacement on the grid-connected switch under the condition that the inverter circuit or the packaging of the inverter circuit is not damaged, when the grid-connected switch is closed, the inverter circuit is conducted with the power grid, and when the grid-connected switch is disconnected, the inverter circuit is disconnected with the power grid.
Further, the grid-connected switches are discretely distributed on one side of the inverter circuit, and the grid-connected switches and the inverter circuit are arranged in an independent modularized mode.
Further, the method further comprises the following steps: the first circuit board and the second circuit board are mutually independent;
the inverter circuit and the grid-connected switch are distributed on different circuit boards.
Further, wherein the inverter circuit and the control circuit are distributed on the first circuit board;
and the grid-connected switch and the sampling circuit are distributed on the second circuit board.
Further, the device also comprises a first containing cavity and a second containing cavity which are isolated from each other;
the first circuit board is arranged in the first accommodating cavity, and the front space of the first accommodating cavity is filled with filling materials so as to at least surround the inverter circuit on the first circuit board;
the second circuit board is arranged in the second accommodating cavity, and at least the grid-connected switch on the second circuit board is suitable for being independently detached.
Further, the method further comprises the following steps:
a first housing configured with the first cavity adapted to house the first circuit board;
a second housing configured with the second cavity adapted to receive the second circuit board, the second circuit board being detachably connected to the second housing;
and the cover body is connected with the first shell and/or the second shell so as to at least cover the accommodating cavity of the second shell.
Further, the first housing and the second housing are mechanically connected and fixed, and an electrical connection channel is provided at the mechanical connection position, and at least one cable penetrates through the electrical connection channel to connect the first circuit board and the second circuit board.
Further, one side of one of the first shell and the second shell is provided with a mounting opening, the other side is provided with a connecting lug matched with the mounting opening, and the hollow position of the connecting lug is provided with the electric connecting channel penetrating through the first accommodating cavity and the second accommodating cavity.
Further, one side of one of the first shell and the second shell is provided with a connecting boss at a position near the mounting opening, the other side is provided with a connecting post connecting seat matched with the connecting boss, and the connecting boss and the connecting post connecting seat are fixedly connected through a connecting piece.
Further, electrical connection terminals are respectively arranged adjacent to the mechanical connection of the first circuit board and the second circuit board, and the electrical connection terminals are connected through cables so as to realize circuit connection between the inverter circuit and the grid-connected switch.
Further, communication terminals are respectively arranged adjacent to the mechanical connection of the first circuit board and the second circuit board, and the communication terminals are connected through cables so as to realize communication connection between the control circuit and the sampling circuit; or;
the control circuit is in wireless communication connection with the sampling circuit.
The invention also relates to an integration of a photovoltaic module comprising:
a photovoltaic module comprising a back side and a light receiving surface;
a photovoltaic grid-connected inverter located on the back side of the photovoltaic module and receiving a direct-current voltage from the light receiving surface of the photovoltaic module; wherein;
the photovoltaic grid-tie inverter comprises an inverter circuit and a grid-tie switch independent of each other, the grid-tie switch being adapted to perform a disassembly replacement of the grid-tie switch without damaging the inverter circuit or its packaging.
Further, wherein the inverter circuit and the grid-tie switch are distributed on different circuit boards, the grid-tie switch being adapted to be detached from one circuit board or together with one circuit board without damaging the inverter circuit on the other circuit board.
Further, the inverter circuit and the grid-connected switch are respectively accommodated in a first housing and a second housing which are independent from each other; wherein,
filling the accommodating cavity of the first shell with potting material to at least enclose the inverter circuit;
the grid-connected switch is suitable for being freely detached from the second shell or the second shell provided with the grid-connected switch is suitable for being freely detached from the first shell.
Further, the first shell and the second shell are mechanically connected and fixed and are arranged in parallel along the plane axis direction of the photovoltaic module.
Compared with the prior art, the technical scheme of the invention has the beneficial technical effects that:
according to the technical scheme, the grid-connected switches and the inverter circuits are distributed independently, so that the grid-connected switches are suitable for being detached and replaced under the condition that the inverter circuits or the packaging of the inverter circuits are not damaged, and can be detached from the photovoltaic grid-connected inverter independently for replacement when the grid-connected switches are damaged due to service life reasons or other reasons, and the technical problem that the photovoltaic grid-connected inverter is damaged integrally and cannot be used normally when the grid-connected switches are damaged is effectively solved.
In addition, a switching tube (such as MOSfet) in an inverter circuit, a magnetic core element (such as an inductor and a transformer) and the like are heating devices, a grid-connected switch (such as a relay) is a heat-resistant element, the ageing of internal plastic and insulating materials of the grid-connected switch (such as the relay) can be accelerated at high temperature, contacts are oxidized and corroded to make arc extinction difficult, technical parameters of the electric elements decay, the reliability is lowered, and particularly the photovoltaic grid-connected inverter is often required to be encapsulated, so that the temperature in the integral photovoltaic grid-connected inverter is higher, the normal service life and performance of the grid-connected switch are influenced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1: the photovoltaic grid-connected inverter structure schematic diagram of the specific embodiment of the invention;
fig. 2: the photovoltaic grid-connected inverter structure explosion schematic diagram of the specific embodiment of the invention;
fig. 3: the photovoltaic grid-connected inverter part structure schematic diagram of the specific embodiment of the invention;
fig. 4: the photovoltaic grid-connected inverter is a partial structure perspective view;
fig. 5: the photovoltaic grid-connected inverter part structure explosion schematic diagram of the specific embodiment of the invention;
fig. 6: the structure cross section of the photovoltaic grid-connected inverter of the specific embodiment of the invention;
fig. 7: the principle schematic diagram of the photovoltaic grid-connected inverter of the specific embodiment of the invention;
fig. 8: the photovoltaic grid-connected inverter grid-connected switch disassembly and assembly schematic diagram of the specific embodiment of the invention;
fig. 9: the integrated structure of the photovoltaic module is schematically shown in the embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, 2 and 7, a photovoltaic grid-connected inverter 100 includes:
the input end 10 is suitable for connecting the photovoltaic modules 200, and the input end 10 can be a group of positive and negative electrode inputs (PV+, PV-) so as to connect one photovoltaic module 200, and can also be a plurality of groups of positive and negative electrode inputs (PV+, PV-) so as to connect a plurality of photovoltaic modules 200;
an output 20 adapted to connect to a power grid;
an inverter circuit 30 configured to receive direct current from one or more photovoltaic modules 200 and convert the input direct current into output alternating current;
a grid-connected switch 40 disposed between the inverter circuit 30 and the output terminal 20 for controlling connection of the inverter circuit 30 to a power grid;
a sampling circuit configured to collect grid parameters of a grid, such as grid voltage, grid frequency, etc.;
a control circuit connected with the sampling circuit for controlling the opening or closing of the grid-connected switch 40 according to the change of the grid parameters; wherein,
the grid-connected switch 40 and the inverter circuit 30 are distributed independently of each other, and are adapted to perform disassembly and replacement of the grid-connected switch 40 without damaging the inverter circuit 30 or its packaging, when the grid-connected switch 40 is closed, the inverter circuit 30 is connected to the power grid, and when the grid-connected switch 40 is disconnected, the inverter circuit 30 is disconnected from the power grid.
The grid-connected switch 40 and the inverter circuit 30 are distributed independently, and are suitable for performing disassembly and replacement on the grid-connected switch 40 under the condition that the inverter circuit 30 or the package thereof is not damaged, so that when the grid-connected switch 40 is damaged due to service life reasons or other reasons, the grid-connected switch can be independently disassembled from the photovoltaic grid-connected inverter 100 to be replaced, and the technical problem that the whole photovoltaic grid-connected inverter 100 is damaged and cannot be normally used when the grid-connected switch 40 is damaged is effectively solved.
In addition, the switching tubes (such as mosfets) in the inverter circuit 30, the magnetic core elements (such as inductors and transformers) and the like are heating devices, the grid-connected switch 40 (such as a relay) is a heat-resistant element, the aging of internal plastics and insulating materials of the grid-connected switch 40 (such as the relay) can be accelerated at high temperature, the contacts are oxidized and corroded to make arc extinction difficult, the technical parameters of the electric elements decay, the reliability is lowered, and particularly the photovoltaic grid-connected inverter 100 is often required to be encapsulated, so that the temperature in the whole photovoltaic grid-connected inverter 100 is higher, the normal service life and performance of the grid-connected switch 40 are influenced, and the grid-connected switch 40 and the inverter circuit 30 are distributed independently of each other in the technical scheme, so that the grid-connected switch 40 is not influenced by the heating devices in the inverter circuit 30.
Specifically, when the sampling circuit detects that the grid voltage exceeds the upper limit of the allowable voltage fluctuation range or the grid frequency exceeds the upper limit of the allowable frequency fluctuation range, the control circuit controls the grid-connected switch 40 to be turned off so as to disconnect the photovoltaic grid-connected inverter 100 from the grid.
The power grid voltage exceeds the upper limit of the allowable voltage fluctuation range, and can be set to be a rated power grid voltage peak value with the instantaneous value exceeding 1.1 times of the power grid voltage or a rated power grid voltage effective value with the effective value exceeding 1.1 times of the power grid voltage. The power grid frequency exceeds the upper limit of the allowable frequency fluctuation range, and can be set to be 0.5Hz higher than the rated power frequency.
The grid-connected switch 40 is preferably a relay.
With continued reference to fig. 2, the grid-connected switches 40 are discretely distributed on one side of the inverter circuit 30, and are independently and modularly arranged.
That is, the grid-connected switch 40 and the inverter circuit 30 are not integrally arranged, the grid-connected switch 40 is independently modularized and discretely distributed on one side of the inverter circuit 30, and the grid-connected switch 40 is suitable for being independently detached and replaced without damaging the inverter circuit 30.
With continued reference to fig. 2, the photovoltaic grid-tied inverter 100 further includes a first circuit board 50 and a second circuit board 60 that are independent of each other;
wherein the inverter circuit 30 and the grid-tie switch 40 are distributed on different circuit boards, the grid-tie switch 40 is adapted to be detached from one circuit board or detached together with one circuit board without damaging the inverter circuit 30 on the other circuit board.
For example, the inverter circuits 30 are distributed on the first circuit board 50, the grid-tie switches 40 are distributed on the second circuit board 60, and the grid-tie switches 40 are adapted to be detached independently from the second circuit board 60, or the grid-tie switches 40 are detached together with the second circuit board 60 without damaging the inverter circuits 30 on the first circuit board 50.
Further, as shown in fig. 7, wherein the inverter circuit 30 and the control circuit are distributed on the first circuit board 50;
the grid-tie switch 40 and the sampling circuit are distributed on the second circuit board 60.
The sampling circuit is connected with the control circuit in signal communication, including signal line connection or wireless communication connection, especially near field communication connection, such as bluetooth communication connection, and is used for collecting power grid parameters of a power grid, such as power grid voltage, power grid frequency and the like, and the sampling circuit transmits the collected power grid parameters to the control circuit, and the control circuit controls to open or close the grid-connected switch 40 according to the received power grid parameters.
Further, as shown in fig. 2, the photovoltaic grid-connected inverter 100 further includes a first cavity a and a second cavity B isolated from each other;
the first circuit board 50 is placed in the first cavity a, and a potting material (not shown) fills the front space of the first cavity a to surround at least the inverter circuit 30 on the first circuit board 50; by using the potting material, a tightly closed internal space for the electrical components (e.g., electrical connection terminals, etc.) and the electronic components (e.g., mos, inductance elements, transformers, etc.) of the inverter circuit 30 is formed, in which the electrical components and the electronic components of the inverter circuit 30 are protected from the external environment, and the electrical components and the electronic components of the inverter circuit 30 are sufficiently protected.
The second circuit board 60 is placed in the second cavity B, and at least the grid-tie switch 40 on the second circuit board 60 is adapted to be detached independently, such as the grid-tie switch 40 is adapted to be detached independently from the second circuit board 60, or the grid-tie switch 40 is detached together with the second circuit board 60 without damaging the inverter circuit 30 on the first circuit board 50.
Further, as shown in fig. 2, the photovoltaic grid-connected inverter 100 further includes:
a first housing 70 provided with a first cavity a adapted to house the first circuit board 50; the outer surface of the first housing 70 is provided with heat dissipation fins for dissipating heat of the inverter circuit 30 on the first circuit board 50;
a second housing 80 configured with a second cavity B adapted to receive the second circuit board 60, the second circuit board 60 being detachably connected to the second housing 80;
at least one cover 90 is connected to the first housing 70 and/or the second housing 80 to cover at least the accommodating cavity of the second housing 80.
Preferably, the cover 90 includes a first cover 90a and a second cover 90B, the first cover 90a is bolted to the first housing 70 to cover the first cavity a, and the second cover 90B is bolted to the second housing 80 to cover the second cavity B.
When the grid-connected switch 40 needs to be disassembled and replaced, the bolts are unscrewed, and the second cover 90b is disassembled, or the first cover 90a is simultaneously disassembled, so that the disassembly and replacement operation is performed, and no damage is caused to the inverter circuit 30 at this time.
Referring to fig. 3, 4 and 5, the first housing 70 and the second housing 80 are mechanically connected and fixed, and an electrical connection channel 6 is provided at the mechanical connection position, and at least one cable penetrates through the electrical connection channel 6 to connect the first circuit board 50 and the second circuit board 60.
Further, referring specifically to fig. 5, one side of either the first housing 70 or the second housing 80 is provided with a mounting opening 5, the other is provided with a connection lug 1 adapted thereto, and an electrical connection passage 6 penetrating the first and second cavities a and B is formed at a hollow position of the connection lug 1.
Specifically, the first housing 70 is provided with a mounting opening 5 at one side, the second housing 80 is provided with a connecting lug 1 adapted thereto, the shape and size of the connecting lug 1 correspond to those of the mounting opening 5, when the connecting lug 1 is assembled in the mounting opening 5, the upper surface of the connecting lug 1 is substantially flush with the upper surface of the first housing 70, and forms a part of the first cavity a, so that on one hand filling of the potting material is facilitated, and on the other hand, connecting mounting of the cover body 90 is facilitated, as shown in fig. 4.
With continued reference to fig. 5 and 6, one side of the first housing 70 and the second housing 80 is provided with a connection boss 7 near the mounting opening 5, and the other side is provided with a connection seat 9 matched with the connection boss 7, and the connection boss 7 and the connection seat 9 are connected and fixed by a connecting piece 8.
Specifically, the first housing 70 is provided with a connection boss 7 at a position near the mounting opening 5, the second housing 80 is provided with a connection seat 9 engaged with the connection boss 7, and the connection boss 7 and the connection seat 9 are connected and fixed by a connection member 8.
In this way, the mechanical connection between the first housing 70 and the second housing 80 is achieved on the one hand by the mechanical engagement of the mounting opening 5 with the connecting lug 1 and on the other hand by the connection of the connecting boss 7 with the connecting socket 9 via a connecting piece 8.
Further, referring to fig. 3 and 6, the first circuit board 50 and the second circuit board 60 are respectively provided with electrical connection terminals (4 a,4 b) adjacent to the mechanical connection, and the power cable 2 between the electrical connection terminals (4 a,4 b) is connected to realize the circuit connection of the inverter circuit 30 and the grid-connected switch 40.
Further, communication terminals are respectively arranged at the adjacent mechanical connection positions of the first circuit board 50 and the second circuit board 60, and a communication cable 3 is connected between the communication terminals to realize communication connection between the control circuit and the sampling circuit; or; the control circuit is in wireless communication connection with the sampling circuit.
Wherein, the power cable 2 is detachable from the electric connection terminal 4b, i.e. the electric connection terminal located at one side of the grid-connected switch 40; similarly, when the first circuit board 50 and the second circuit board 60 are connected by the communication cable 3 to realize the communication connection between the control circuit and the sampling circuit, the communication cable 3 and the electrical connection terminal located at one side of the grid-connected switch 40 can be detached, so as to facilitate the disassembly, assembly and replacement of the grid-connected switch 40.
In addition, it is also worth mentioning that:
those skilled in the art will appreciate that there are a variety of ways in which the grid tie switch 40 may be adapted to be removed and replaced, such as:
mode one: the grid-tie switch 40 is adapted to be detached independently from the second circuit board 60 without damaging the inverter circuit 30 on the first circuit board 50;
mode two: the grid-tie switch 40 is detached from the second housing 80 together with the second circuit board 60 without damaging the inverter circuit 30 on the first circuit board 50;
mode three: the grid-connected switch 40 is disassembled together with the second housing 80 and the integral assembly 300 of the internal assembly unit without damaging the inverter circuit 30 on the first circuit board 50;
when the second housing 80, its internal component units, and the grid-tie switch are removed together, the power cable 2 and/or the communication cable 3 are first removed from the electrical connection terminal on the side of the grid-tie switch 40, and then the whole assembly 300 is separated therefrom, as shown in fig. 8.
In addition, it should be noted that the above-mentioned manner in which the grid-connected switch 40 is suitable for being removed and replaced is not limited to the above-mentioned three manners, and those skilled in the art should know that only the grid-connected switch and the inverter circuit are distributed independently, and that it is within the scope of the present invention to be suitable for removing and replacing the grid-connected switch without damaging the inverter circuit or the package thereof. In addition, referring to fig. 9, the present invention also relates to an integration of a photovoltaic module, which includes:
a photovoltaic module 200 comprising a back side and a light receiving surface;
a photovoltaic grid-connected inverter 100 that is located at the back of the photovoltaic module 200 and receives a direct-current voltage from the light receiving surface of the photovoltaic module 200; wherein;
the photovoltaic grid-tie inverter 100 includes an inverter circuit 30 and a grid-tie switch 40 independent of each other, the grid-tie switch 40 being adapted to perform a disassembly replacement of the grid-tie switch 40 without damaging the inverter circuit 30 or its packaging.
Further, wherein the inverter circuit 30 and the grid-tie switch 40 are distributed on different circuit boards, the grid-tie switch 40 is adapted to be detached from one circuit board or detached together with one circuit board without damaging the inverter circuit 30 on the other circuit board.
Further, the inverter circuit 30 and the grid-connected switch 40 are housed in a first case 70 and a second case 80, respectively, which are independent of each other; wherein,
the potting compound fills the receiving cavity of the first housing 70 to at least enclose the inverter circuit 30;
the grid-tie switch 40 is adapted to be freely detachable from the second housing 80 or the second housing 80 provided with the grid-tie switch 40 is adapted to be freely detachable from the first housing 70.
Further, the first housing 70 and the second housing 80 are mechanically connected and fixed and are arranged in parallel along the plane axis L direction of the photovoltaic module 200.
The integration of the photovoltaic module provided by the present technical solution has all the beneficial effects of the above-mentioned photovoltaic grid-connected inverter 100, and is not described herein again.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the technical solutions according to the embodiments of the present invention.
Claims (15)
1. A photovoltaic grid-tie inverter, comprising:
an input adapted to connect to a photovoltaic module;
an output adapted to connect to a power grid;
an inverter circuit configured to receive direct current from one or more of the photovoltaic modules and convert the input direct current into output alternating current;
a grid-connected switch provided between the inverter circuit and the output terminal, for controlling connection of the inverter circuit to the power grid;
a sampling circuit configured to acquire grid parameters of the grid;
the control circuit is connected with the sampling circuit and is used for controlling the opening or closing of the grid-connected switch according to the change of the power grid parameters; wherein,
the grid-connected switch and the inverter circuit are distributed independently, and are suitable for carrying out disassembly and replacement on the grid-connected switch under the condition that the inverter circuit or the packaging of the inverter circuit is not damaged, when the grid-connected switch is closed, the inverter circuit is conducted with the power grid, and when the grid-connected switch is disconnected, the inverter circuit is disconnected with the power grid.
2. The photovoltaic grid-tied inverter of claim 1, wherein the grid-tied switches are discretely distributed on one side of the inverter circuit, both in an independent modular arrangement.
3. The photovoltaic grid-tie inverter according to claim 1 or 2, further comprising: the first circuit board and the second circuit board are mutually independent;
the inverter circuit and the grid-connected switch are distributed on different circuit boards.
4. The photovoltaic grid-tie inverter of claim 3, wherein the inverter circuit and the control circuit are distributed on the first circuit board;
and the grid-connected switch and the sampling circuit are distributed on the second circuit board.
5. The photovoltaic grid-tie inverter of claim 3, further comprising a first cavity and a second cavity isolated from each other;
the first circuit board is arranged in the first accommodating cavity, and the front space of the first accommodating cavity is filled with filling materials so as to at least surround the inverter circuit on the first circuit board;
the second circuit board is arranged in the second accommodating cavity, and at least the grid-connected switch on the second circuit board is suitable for being independently detached.
6. The photovoltaic grid-tied inverter of claim 5, further comprising:
a first housing configured with the first cavity adapted to house the first circuit board;
a second housing configured with the second cavity adapted to receive the second circuit board, the second circuit board being detachably connected to the second housing;
and the cover body is connected with the first shell and/or the second shell so as to at least cover the accommodating cavity of the second shell.
7. The grid-tied photovoltaic inverter of claim 6, wherein the first housing and the second housing are mechanically connected and secured, and an electrical connection channel is provided at the mechanical connection, at least one cable extending through the electrical connection channel to connect the first circuit board and the second circuit board.
8. The grid-connected photovoltaic inverter according to claim 7, wherein one side of the first and second housings is provided with a mounting opening, the other is provided with a connection lug adapted thereto, and the hollow position of the connection lug is formed with the electrical connection passage penetrating through the first and second cavities.
9. The grid-connected photovoltaic inverter according to claim 8, wherein one side of the first housing and the second housing is provided with a connection boss at a position near the mounting opening, and the other side is provided with a connection post connection seat matched with the connection boss, and the connection boss and the connection post connection seat are connected and fixed through a connecting piece.
10. The photovoltaic grid-tie inverter of claim 7, wherein the first circuit board and the second circuit board are respectively provided with an electrical connection terminal adjacent to the mechanical connection, and the electrical connection terminals are connected by a cable to realize the circuit connection of the inverter circuit and the grid-tie switch.
11. The photovoltaic grid-tie inverter of claim 7, wherein the first circuit board and the second circuit board are respectively provided with a communication terminal adjacent to the mechanical connection, and the communication terminals are connected by a cable to realize the communication connection between the control circuit and the sampling circuit; or;
the control circuit is in wireless communication connection with the sampling circuit.
12. An integration of photovoltaic modules, comprising:
a photovoltaic module comprising a back side and a light receiving surface;
a photovoltaic grid-connected inverter located on the back side of the photovoltaic module and receiving a direct-current voltage from the light receiving surface of the photovoltaic module; wherein;
the photovoltaic grid-tie inverter comprises an inverter circuit and a grid-tie switch independent of each other, the grid-tie switch being adapted to perform a disassembly replacement of the grid-tie switch without damaging the inverter circuit or its packaging.
13. The integration of the photovoltaic module of claim 12, wherein the inverter circuit and the grid-tie switch are distributed on different circuit boards, the grid-tie switch being adapted to be detached from or together with one circuit board without damaging the inverter circuit on the other circuit board.
14. The integration of the photovoltaic module according to claim 12, wherein the inverter circuit and the grid-tie switch are housed in a first housing and a second housing, respectively, that are independent of each other; wherein,
filling the accommodating cavity of the first shell with potting material to at least enclose the inverter circuit;
the grid-connected switch is suitable for being freely detached from the second shell or the second shell provided with the grid-connected switch is suitable for being freely detached from the first shell.
15. The assembly of claim 14, wherein the first housing and the second housing are mechanically coupled and secured and arranged side-by-side along a planar axis of the photovoltaic module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311391721.5A CN117154830A (en) | 2023-10-24 | 2023-10-24 | Integration of photovoltaic grid-connected inverter and photovoltaic module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311391721.5A CN117154830A (en) | 2023-10-24 | 2023-10-24 | Integration of photovoltaic grid-connected inverter and photovoltaic module |
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| CN117154830A true CN117154830A (en) | 2023-12-01 |
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| CN202311391721.5A Pending CN117154830A (en) | 2023-10-24 | 2023-10-24 | Integration of photovoltaic grid-connected inverter and photovoltaic module |
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| CN101753075A (en) * | 2009-11-16 | 2010-06-23 | 上海雅泰电子科技有限公司 | Motor controller and independent MOS module thereof |
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| CN111466074A (en) * | 2017-12-15 | 2020-07-28 | 艾思玛太阳能技术股份公司 | Inverter with a voltage regulator |
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| CN219514038U (en) * | 2023-02-28 | 2023-08-11 | 深圳市拓普泰克技术股份有限公司 | Micro inverter and photovoltaic system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101753075A (en) * | 2009-11-16 | 2010-06-23 | 上海雅泰电子科技有限公司 | Motor controller and independent MOS module thereof |
| CN102545257A (en) * | 2012-01-12 | 2012-07-04 | 广东中商国通电子有限公司 | Solar photovoltaic generating single-phase grid-connected inverter and control method thereof |
| CN111466074A (en) * | 2017-12-15 | 2020-07-28 | 艾思玛太阳能技术股份公司 | Inverter with a voltage regulator |
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