A photovoltaic inverter and energy storage system

Abstract

This application provides a photovoltaic inverter and energy storage system, relating to the field of inverter technology. The photovoltaic inverter includes a housing with multiple photovoltaic input terminals; a photovoltaic input board located inside the housing and electrically connected to the multiple photovoltaic input terminals; an arcing sensor located inside the housing and sleeved on at least one photovoltaic input terminal; and a connector disposed on the arcing sensor and connected to the housing. The photovoltaic inverter of this application reduces the vibration of the arcing sensor.

Description

Technical Field

[0001] This application relates to the field of inverter technology, and more particularly to a photovoltaic inverter and energy storage system. Background Technology

[0002] In photovoltaic inverters, arcing protection is an optional feature. If the user selects this feature, a separate arcing sensor needs to be added to the existing hardware.

[0003] In related technologies, arcing sensors are a separately added solution, which needs to be added to the existing structure. Usually, a ring arcing sensor is directly installed on the DC input line inside the photovoltaic inverter. The arcing sensor is then connected to a signal line back to the main control board and electrically connected to the main control board.

[0004] However, arcing sensors directly mounted on the DC input line are prone to wobbling. Utility Model Content

[0005] This application provides a photovoltaic inverter and energy storage system to solve the problem that the arcing sensor is prone to shaking after the photovoltaic inverter is equipped with an arcing sensor.

[0006] On one hand, embodiments of this application provide a photovoltaic inverter, including:

[0007] A housing, wherein at least two photovoltaic input terminals are provided on the housing, and the photovoltaic input terminal portion is located inside the housing;

[0008] A photovoltaic input board is located inside the housing, and the photovoltaic input board is electrically connected to a plurality of photovoltaic input terminals located on one side of the housing.

[0009] An arcing sensor is located inside the housing and is sleeved on at least one of the photovoltaic input terminals;

[0010] A connector is disposed on the arc sensor and is connected to the housing.

[0011] In one possible implementation, the photovoltaic input panel and the photovoltaic input terminal are located on the same side of the housing.

[0012] In one possible implementation, the arcing sensor is located between the photovoltaic input panel and the photovoltaic input terminal.

[0013] In one possible implementation, the housing is provided with at least one support column, and the photovoltaic input panel is connected to the support column so that there is a gap between the photovoltaic input panel and the housing wall for installing the arc sensor.

[0014] In one possible implementation, the photovoltaic input panel is disposed on the side wall of the enclosure.

[0015] In one possible implementation, the connector is an adhesive layer.

[0016] In one possible implementation, there are two photovoltaic input boards, and the plurality of photovoltaic input terminals are arranged into two input groups. Each input group has at least two photovoltaic input terminals. The input groups correspond to the photovoltaic input boards, and each photovoltaic input board and each input group has an arcing sensor.

[0017] In one possible implementation, the photovoltaic input terminals in at least one group of the inputs are arranged in a rectangular configuration.

[0018] In one possible implementation, the arc sensor is provided with multiple detection holes, and the photovoltaic input terminal passes through the detection holes.

[0019] On the other hand, this application provides an energy storage system, including an energy storage battery and a photovoltaic inverter electrically connected to the energy storage battery.

[0020] This application provides a photovoltaic inverter and energy storage system. The inverter has at least two photovoltaic input terminals on the wall of the enclosure, with the photovoltaic input terminals located inside the enclosure. An arcing sensor is fitted onto at least one photovoltaic input terminal and connected to the enclosure via a connector. The photovoltaic input terminal is electrically connected to the photovoltaic input board. The arcing sensor detects arcing at the DC input terminal of the photovoltaic inverter. By fitting the arcing sensor onto the photovoltaic input terminal located on the side wall of the enclosure and fixing it with a connector, the possibility of arcing sensor shaking is reduced. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0022] Figure 1 This is a schematic diagram of the structure of the photovoltaic inverter provided in this application;

[0023] Figure 2 This is a structural cross-sectional view of the photovoltaic inverter provided in this application;

[0024] Figure 3 for Figure 1 Cross-sectional view of the installation location of the arc sensor.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100. Enclosure; 110. Photovoltaic input terminal; 120. Support column;

[0027] 200. Photovoltaic input panel;

[0028] 300. Arc sensor; 310. Detection hole; 320. Sensor lead-out wire;

[0029] 400. Connectors.

[0030] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0032] In photovoltaic inverters, arcing protection is an optional feature. If the user selects this feature, a separate arcing sensor needs to be added to the existing hardware.

[0033] In related technologies, arcing sensors are a separately added solution, which needs to be added to the existing structure. Usually, a ring arcing sensor is directly installed on the DC input line inside the photovoltaic inverter. The arcing sensor is then connected to a signal line back to the main control board and electrically connected to the main control board.

[0034] However, arcing sensors directly mounted on the DC input line are prone to vibration.

[0035] This application provides a photovoltaic inverter and energy storage system. The inverter has at least two photovoltaic input terminals on the wall of the enclosure, with the photovoltaic input terminals located inside the enclosure. An arcing sensor is fitted onto at least one photovoltaic input terminal and connected to the enclosure via a connector. The photovoltaic input terminal is electrically connected to the photovoltaic input panel. The arcing sensor detects arcing at the DC input terminal of the photovoltaic inverter. By fitting the arcing sensor onto the photovoltaic input terminal located on the side wall of the enclosure and fixing it with a connector, the possibility of arcing sensor shaking is reduced.

[0036] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0037] This application provides a photovoltaic inverter, referring to... Figure 1 , Figure 2 and Figure 3 The photovoltaic inverter includes: a housing 100, a photovoltaic input panel 200, an arc sensor 300, and a connector 400.

[0038] At least two photovoltaic input terminals 110 are provided on the enclosure 100, and the photovoltaic input terminals 110 are partially located inside the enclosure 100.

[0039] The photovoltaic input terminal 110 is disposed on the wall of the enclosure 100 and extends through the wall of the enclosure 100. One end of the photovoltaic input terminal 110 is located inside the enclosure 100, and the other end extends outside the enclosure 100 and is electrically connected to the photovoltaic panel.

[0040] For example, the Photovoltaic Terminal 110 (PV terminal) is a dedicated electrical interface connecting the photovoltaic module (i.e., solar panel) to the inverter to facilitate the safe and efficient transmission of direct current.

[0041] In the example of this application, the photovoltaic input terminal 110 adopts a waterproof pluggable terminal such as MC4 or Amphenol, which reduces installation time and provides good waterproof and dustproof performance to adapt to harsh outdoor environments.

[0042] For example, the photovoltaic input terminal 110 in this application also has a built-in diode to prevent reverse current from burning out the device.

[0043] The photovoltaic input panel 200 is located inside the housing 100, and the photovoltaic input panel 200 is electrically connected to one side of the multiple photovoltaic input terminals 110 located inside the housing 100.

[0044] Among them, the photovoltaic input board 200 refers to the circuit module connected to the photovoltaic input terminal 110 in the photovoltaic inverter, which can be a DC-DC boost board.

[0045] For example, the enclosure 100 also contains an MPPT control board, output circuits and other circuit modules, which will not be described in detail here.

[0046] The arc sensor 300 is located inside the housing 100 and is mounted on at least one photovoltaic input terminal 110.

[0047] The connector 400 is mounted on the arc sensor 300 and is connected to the housing 100.

[0048] The arcing sensor 300 is directly wrapped around the photovoltaic input terminal 110, and the wall of the housing 100 next to the photovoltaic input terminal 110 is used as an invisible bracket, which can be fixed by the connector 400. The arcing sensor 300 shares space with the photovoltaic input terminal 110 and does not need to occupy extra space or additional wiring, making the entire interior of the photovoltaic inverter simpler and smoother, reducing the impact of the arcing sensor 300 on the internal spatial layout of the photovoltaic inverter, and improving the internal regularity of the photovoltaic inverter.

[0049] For example, the enclosure 100 has a bottom plate and four side walls, and the upper surface of the enclosure 100 is an opening for installing the internal electrical components of the photovoltaic inverter. The enclosure 100 is also provided with a cover for closing the opening, which closes and seals the opening to achieve the effect of dustproof and waterproof.

[0050] For example, the MPPT control board, output circuit, and other circuit modules inside the photovoltaic sensor are all mounted on the bottom plate of the housing 100.

[0051] For example, a sealing ring is provided between the housing 100 and the cover to improve the sealing effect.

[0052] In one possible implementation, the photovoltaic input panel 200 and the photovoltaic input terminal 110 are located on the same side of the housing 100.

[0053] The photovoltaic input panel 200 is installed in the photovoltaic input terminal 110 mounting area on the side wall of the enclosure 100. The DC input line is connected to the nearest junction via the shortest path, avoiding the wiring harness crossing the compartment. This reduces the redundant space behind the photovoltaic input panel 200, and there are no hanging cables in front of the photovoltaic input panel 200, improving the utilization rate of internal space and maintainability.

[0054] In one possible implementation, the arc sensor 300 is located between the photovoltaic input panel 200 and the input terminal.

[0055] The arc sensing ring is axially embedded between the photovoltaic input panel 200 and the DC terminal. The terminal locking force is used to achieve bracketless coplanar fixation, forming an integrated electromagnetic coupling path. The DC bus passes through the core through the shortest axis, which not only eliminates additional installation height and parasitic inductance, but also improves the signal-to-noise ratio of high-frequency arc light signals. The whole machine obtains a through-type wiring space, and the space utilization and maintainability are optimized simultaneously.

[0056] In one possible implementation, refer to Figure 3A support column 120 is provided on the housing 100, and the photovoltaic input panel 200 is connected to the support column 120 so that there is a gap between the photovoltaic input panel 200 and the wall of the housing 100 for installing the arc sensor 300.

[0057] The photovoltaic input panel 200 is suspended and installed using the support columns 120 evenly distributed on the wall of the housing 100, forming a gap between the photovoltaic input panel 200 and the wall of the housing 100. This gap serves as the receiving cavity for the arcing sensor 300. The sensor can be embedded in the interlayer between the photovoltaic input panel 200 and the wall of the housing 100 without additional brackets, reducing redundant height, making the wiring compact, improving space utilization, facilitating the fixing of the arcing sensor 300, maintaining the shortest path of the DC bus, compressing the axial dimension, and improving the electromagnetic compatibility performance of the whole machine.

[0058] For example, multiple support columns 120 are provided. The photovoltaic input panel 200 is mounted on multiple support columns 120.

[0059] For example, the support column 120 is welded or bonded to the inner wall of the housing 100, the photovoltaic input panel 200 is located on the support column 120, and the photovoltaic input panel 200 is fixed by screws or bolts passing through the photovoltaic input panel 200 and threadedly connected to the support column 120.

[0060] Specifically, there is a gap between the photovoltaic input board 200 and the arc sensor 300. This is to prevent the pins of the circuit components on the photovoltaic input board 200 from coming into contact with the arc sensor 300, which would affect the detection of the arc sensor 300.

[0061] The arcing sensor 300 is installed between the photovoltaic input board 200 and the photovoltaic input terminal 110. When installing the arcing sensor 300, care must be taken to ensure that the surface of the arcing sensor 300 does not contact the device pins on the back of the photovoltaic input board 200. Depending on the shape and installation position of the arcing sensor 300, the devices on the photovoltaic input board 200 should avoid the sensor's location. For locations where avoidance is not possible, the device pins should be shortened to prevent interference. The devices on the photovoltaic input board 200 should also avoid the mounting holes of the photovoltaic input board 200.

[0062] In one possible implementation, refer to Figure 1 The photovoltaic input panel 200 is installed on the side wall of the housing 100.

[0063] The photovoltaic input terminal 110 and the photovoltaic input board 200 are both located on the side wall of the enclosure 100, which allows for a more reasonable arrangement of the internal space of the enclosure 100, improves space utilization, and disperses electrical components to improve heat dissipation.

[0064] In one possible implementation, the connector 400 is an adhesive layer.

[0065] The adhesive layer is located on the back of the arcing sensor 300 and is bonded to the side wall of the housing 100. This improves the fixation of the arcing sensor 300 and prevents it from falling off due to vibrations from the photovoltaic inverter. Furthermore, the adhesive method makes the installation of the arcing sensor 300 more convenient, improves installation efficiency, reduces operational difficulty, and provides removability for maintenance.

[0066] For example, the adhesive layer can be silicone structural adhesive, double-sided acrylic tape, silylated polyurethane transfer tape, etc.

[0067] In other examples, the connector 400 can also be a snap-fit, which is located on the back of the arc sensor 300. A slot is provided on the side wall of the housing 100, and the snap-fit ​​engages with the slot to improve the fixing effect. Alternatively, the arc sensor 300 may have a slot on its back, and a snap-fit ​​is located on the inner side of the side wall of the housing 100, engaging with the slot to fix the arc sensor 300.

[0068] In other examples, the connection can also be a screw, which passes through the arc sensor 300 and is threaded into the side wall of the housing 100 to fix the arc sensor 300.

[0069] In one possible implementation, there are two photovoltaic input boards 200, and multiple photovoltaic input terminals 110 are divided into two input groups. Each input group has at least two photovoltaic input terminals 110. The input groups correspond to the photovoltaic input boards 200, and each photovoltaic input board 200 and the input group have an arcing sensor 300.

[0070] Dual photovoltaic input panels 200 are symmetrically arranged on the side wall of the enclosure 100, with each photovoltaic input panel 200 corresponding to an independent set of photovoltaic input terminals 110. A ring-shaped arcing sensor 300 is embedded between each of the two photovoltaic input panels 200 and the photovoltaic input terminals 110, forming a sandwich coplanar structure. The two sets of structural units are arranged in a mirror image, eliminating the need for additional supports. This creates a symmetrical, through-type wiring channel within the enclosure, maximizing space utilization. During maintenance, a single terminal can be directly plugged and unplugged without interfering with the other, simultaneously improving the overall power density and maintainability of the unit.

[0071] For example, the photovoltaic input terminal 110 corresponds to the photovoltaic input board 200 and is disposed on the side wall of the chassis, avoiding switches and other devices.

[0072] In one possible implementation, refer to Figure 2 Each input group has at least four photovoltaic input terminals 110 arranged in a rectangular shape.

[0073] Specifically, the photovoltaic input terminal 110 is arranged in a three-channel, four-string configuration. The three channels (i.e., 3 inputs) refer to the photovoltaic inverter having three independent DC input channels (physically represented by three sets of terminal interfaces). Each channel can connect to one photovoltaic string, and the channels are electrically isolated from each other. The four strings (i.e., 4 sets of photovoltaic modules) refer to the photovoltaic inverter supporting a maximum of four photovoltaic strings. Each string consists of several photovoltaic modules connected in series.

[0074] For example, the photovoltaic input terminals 110 are arranged in a square shape, with a gap between adjacent photovoltaic input terminals 110 to allow space for the sleeve to tighten the photovoltaic input terminals 110. At the same time, the larger gap also facilitates the insertion of photovoltaic wires. In addition, since the coil of the arc sensor 300 cannot be wound into an irregular shape, the square arrangement of the photovoltaic input terminals 110 facilitates the coil forming of the arc sensor 300 and also improves the aesthetics.

[0075] In one possible implementation, the arc sensor 300 is provided with a plurality of detection holes 310, and the photovoltaic input terminal 110 passes through the detection holes 310.

[0076] The detection hole 310 of the arc sensor 300 is interference-fitted with the outer diameter of the photovoltaic input terminal 110, ensuring a tight fit without hindering the insertion and removal of the photovoltaic input terminal 110. It also cooperates with the connector 400 to achieve dual fixation through adhesive bonding and photovoltaic input terminal 110 insertion, improving the fixation effect and preventing the arc sensor 300 from loosening.

[0077] In the arcing sensor 300 of this application, a flattened toroidal magnetic core is used, making the overall thickness less than or equal to 6mm, which does not increase the longitudinal dimension of the photovoltaic input terminal 110. The originally required independent installation space is compressed into a shared space with the photovoltaic input terminal 110, improving space utilization and avoiding the arcing sensor 300 from disturbing the internal spatial layout of the photovoltaic inverter.

[0078] The arc sensor 300 also has an arc sensor 300 output wire, which runs in the reverse direction along the original wire channel of the photovoltaic input terminal 110 and is electrically connected to the control circuit structure. This eliminates the need for a new cable tie, improving the overall internal tidiness of the device. Later maintenance allows for direct plugging and unplugging of the photovoltaic input terminal 110 without touching other components.

[0079] This application also provides an energy storage system, including an energy storage battery and a photovoltaic inverter electrically connected to the energy storage battery. The inverter is electrically connected to the energy storage battery.

[0080] This application provides an energy storage system in which multiple photovoltaic input terminals 110 are installed on the wall of a housing 100 via a photovoltaic inverter. An arcing sensor 300 is fitted onto at least one photovoltaic input terminal 110 and connected to the housing 100 wall via a connector 400. The photovoltaic input terminals 110 are electrically connected to a photovoltaic input board 200. The arcing sensor 300 detects arcing at the DC input terminal of the photovoltaic inverter. Fitting the arcing sensor 300 onto the photovoltaic input terminal 110 ensures that the arcing sensor 300 is close to the housing 100 wall, facilitating its fixation and reducing its impact on the internal spatial layout of the photovoltaic inverter, thereby improving the internal orderliness of the photovoltaic inverter.

[0081] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A photovoltaic inverter, characterized in that, include: A housing (100) is provided with at least two photovoltaic input terminals (110), and the photovoltaic input terminals (110) are partially located inside the housing (100); A photovoltaic input board (200) is located inside the housing (100), and the photovoltaic input board (200) is electrically connected to one side of the plurality of photovoltaic input terminals (110) located inside the housing (100); An arc sensor (300) is located inside the housing (100) and is sleeved on at least one of the photovoltaic input terminals (110); A connector (400) is disposed on the arc sensor (300) and is connected to the housing (100).

2. The photovoltaic inverter according to claim 1, characterized in that, The photovoltaic input panel (200) and the photovoltaic input terminal (110) are located on the same side of the housing (100).

3. The photovoltaic inverter according to claim 2, characterized in that, The arc sensor (300) is located between the photovoltaic input board (200) and the photovoltaic input terminal (110).

4. The photovoltaic inverter according to claim 3, characterized in that, At least one support column (120) is provided on the housing (100), and the photovoltaic input panel (200) is connected to the support column (120) so that there is a gap between the photovoltaic input panel (200) and the wall of the housing (100) for installing the arc sensor (300).

5. The photovoltaic inverter according to claim 2, characterized in that, The photovoltaic input panel (200) is mounted on the side wall of the housing (100).

6. The photovoltaic inverter according to any one of claims 1-5, characterized in that, The connector (400) is an adhesive layer.

7. The photovoltaic inverter according to any one of claims 1-5, characterized in that, The photovoltaic input board (200) is configured as two, and the plurality of photovoltaic input terminals (110) are divided into two input groups. Each input group has at least two photovoltaic input terminals (110). The input groups correspond to the photovoltaic input boards (200), and each photovoltaic input board (200) and the input group are provided with an arc sensor (300).

8. The photovoltaic inverter according to claim 7, characterized in that, At least one set of the photovoltaic input terminals (110) in the input group are arranged in a rectangular shape.

9. The photovoltaic inverter according to any one of claims 1-5, characterized in that, The arc sensor (300) is provided with a plurality of detection holes (310), and the photovoltaic input terminal (110) is correspondingly inserted into the detection holes (310).

10. An energy storage system, characterized in that, It includes an energy storage battery and a photovoltaic inverter as described in any one of claims 1-9, which is electrically connected to the energy storage battery.

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