Distributed photovoltaic power generation device and system
By moving the photovoltaic grid-connected cabinet under the photovoltaic carport and integrating it into the charging pile branch box, the problem of repeated laying of cables and increasing costs in distributed photovoltaic power generation systems is solved, and the nearby self-use and cost savings of photovoltaic power generation are achieved.
Patent Information
- Application Number
- CN202323249990.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-30
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2033-11-30
AI Technical Summary
In the existing distributed photovoltaic power generation system, cables need to be laid between the photovoltaic inverter and the photovoltaic grid-connected cabinet, and the charging pile branch box needs to output power from the distribution room, resulting in repeated cable laying and increased costs.
Move the photovoltaic grid-connected cabinet from the distribution room to the photovoltaic carport, and integrate the configuration of the charging pile branch box into the photovoltaic grid-connected cabinet, saving a charging pile branch box, realizing the direct use of photovoltaic power generation to the charging pile .
The cable laying from the distribution room to the photovoltaic carport is reduced, the space of cables and distribution room is saved, the construction cost is reduced, and the photovoltaic power generation is self-employed nearby.
Smart Images
Figure CN222508814U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of photovoltaic power generation technology, and in particular to a distributed photovoltaic power generation device and system. Background Art
[0002] In distributed photovoltaic projects, photovoltaic carports are increasingly used. The installed capacity of the DC side of photovoltaic carports is generally between tens of kW and hundreds of kW. The power generated by the photovoltaic carport is connected to the company's power distribution system through the photovoltaic grid cabinet, and photovoltaic power generation is self-generated and self-used. The current solution is to place the photovoltaic grid cabinet in the distribution room, which is far away from the photovoltaic carport.
[0003] In the related technology, the photovoltaic inverter is installed under the carport, the photovoltaic grid-connected cabinet is placed in the power distribution room, and the inverter and the photovoltaic grid-connected cabinet are connected by cables. The charging pile is also installed under the carport, and the branch box supporting the charging pile is also installed under the carport. The charging pile branch box and the power distribution cabinet in the power distribution room are connected by cables. There is a problem of repeated laying of cables and increased costs for photovoltaic power generation and charging pile electricity. Summary of the invention
[0004] Based on this, it is necessary to provide a distributed photovoltaic power generation device and system to address the above technical issues.
[0005] In a first aspect, the present application provides a distributed photovoltaic power generation device. The distributed photovoltaic power generation device comprises:
[0006] Photovoltaic carport and power distribution room;
[0007] The photovoltaic carport includes a photovoltaic power generation device, a photovoltaic power distribution device, and a charging pile;
[0008] The photovoltaic power generation device includes a DC combiner box, an inverter, and a photovoltaic array. The photovoltaic array is used to convert sunlight into DC power, and the photovoltaic power generation device is used to convert the DC power into AC power.
[0009] The photovoltaic power distribution device comprises a photovoltaic grid-connected cabinet and a branch box, wherein the branch box is installed inside the photovoltaic grid-connected cabinet so that the branch box obtains the AC power of the charging pile through the photovoltaic grid-connected cabinet;
[0010] The power distribution room is connected to the photovoltaic carport and is used to obtain the alternating current generated by the photovoltaic carport.
[0011] In one embodiment, the photovoltaic array, the DC combiner box, and the inverter are connected in sequence to form a photovoltaic power generation circuit.
[0012] In one of the embodiments, the photovoltaic power generation circuit is connected to the photovoltaic grid-connected cabinet and the power distribution room respectively.
[0013] In one embodiment, the branch box includes a main circuit breaker and a branch circuit breaker, and the main circuit breaker is installed in a photovoltaic grid-connected cabinet.
[0014] In one of the embodiments, the instantaneous current of the main circuit breaker is smaller than the short-circuit current of the branch circuit breaker.
[0015] In one embodiment, the photovoltaic power generation device is connected to the photovoltaic power distribution device, and the photovoltaic power distribution device is connected to the charging pile.
[0016] In one embodiment, the photovoltaic grid-connected cabinet includes a knife switch, a circuit breaker and a control element. One end of the photovoltaic grid-connected cabinet is connected to the charging cabinet, and the other end is connected to the distribution room.
[0017] In one embodiment, the power distribution room is used to transmit electric current to the city power grid and / or charging piles.
[0018] In one embodiment, the photovoltaic array is composed of a plurality of solar panels arranged in a preset manner, and the arrangement comprises at least a square array and a circular array.
[0019] In a second aspect, the present application also provides a distributed photovoltaic power generation system, comprising any of the distributed photovoltaic power generation devices described above.
[0020] The above-mentioned distributed photovoltaic power generation device has at least the following beneficial effects:
[0021] In the embodiment scheme provided by the present disclosure, the photovoltaic grid-connected cabinet is moved from the power distribution room to under the photovoltaic carport, and the charging pile branch box is also conventionally installed under the photovoltaic carport. The two sets of equipment are now integrated into one, and the configuration of the charging pile branch box is integrated into the photovoltaic grid-connected cabinet by improving the design of the power distribution cabinet, eliminating one charging pile branch box. The charging pile branch box is also installed under the photovoltaic carport, and the charging pile branch box can draw power through the photovoltaic grid-connected cabinet, while also realizing photovoltaic power generation for the charging pile. The charging pile branch box eliminates one cable that draws power from the power distribution room. The main circuit breaker of the charging pile branch box is installed in the photovoltaic grid-connected cabinet, and no longer occupies the spare switch in the power distribution room.
[0022] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0024] Figure 1 A schematic diagram of a distributed photovoltaic power generation method in one embodiment;
[0025] Figure 2 A diagram of a power distribution system for distributed photovoltaic power generation in one embodiment;
[0026] Figure 3 Schematic diagram of power distribution of traditional photovoltaic power generation in one embodiment. DETAILED DESCRIPTION
[0027] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to understand the disclosure of the present disclosure more thoroughly and comprehensively.
[0028] In the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0029] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0031] As described in the background technology, the photovoltaic carport includes charging piles, branch boxes, and inverters, and the distribution room includes distribution cabinets and photovoltaic grid-connected cabinets. The photovoltaic grid-connected cabinets are placed in the distribution room, taking up space, and cables need to be laid from the inverter to the photovoltaic grid-connected cabinet, and cables also need to be laid from the distribution room to the branch box. The photovoltaic installed capacity is generally larger than the branch box capacity of the charging pile. Photovoltaic power generation can charge the charging pile. There is a problem of repeated cable laying and increased cost for photovoltaic power generation and charging pile electricity use. The branch box of the charging pile needs to output a power supply from the distribution cabinet in the distribution room, and there may be no or insufficient spare switches in the distribution cabinet, which conflicts with the use of the charging pile.
[0032] The present disclosure provides a distributed photovoltaic power generation device. Figure 1 Schematic diagram of a distributed photovoltaic power generation method in one embodiment. The distributed photovoltaic power generation device includes:
[0033] Photovoltaic carport and power distribution room;
[0034] The photovoltaic carport includes a photovoltaic power generation device, a photovoltaic power distribution device, and a charging pile;
[0035] The photovoltaic power generation device includes a DC combiner box, an inverter, and a photovoltaic array. The photovoltaic array is used to convert sunlight into DC power, and the photovoltaic power generation device is used to convert the DC power into AC power.
[0036] The photovoltaic power distribution device comprises a photovoltaic grid-connected cabinet and a branch box, wherein the branch box is installed inside the photovoltaic grid-connected cabinet so that the branch box obtains the AC power of the charging pile through the photovoltaic grid-connected cabinet;
[0037] The power distribution room is connected to the photovoltaic carport and is used to obtain the alternating current generated by the photovoltaic carport.
[0038] As a distributed photovoltaic project, the photovoltaic carport is combined with charging piles and new energy electric vehicles. It uses photovoltaic modules installed on the roof to generate electricity, which is stored in batteries through charging devices or directly supplied to electric vehicles for charging. The distribution room refers to an indoor distribution site with low-voltage loads. It mainly distributes electricity to low-voltage users and is equipped with medium-voltage incoming lines, distribution transformers and low-voltage distribution devices.
[0039] The photovoltaic carport includes a photovoltaic power generation device, a photovoltaic distribution device, and a charging pile. The photovoltaic power generation device is used to convert direct current into alternating current. The photovoltaic distribution device is used to distribute the current generated by the photovoltaic power generation device to the charging pile and the power grid. The charging pile is installed in the photovoltaic carport and can obtain the current generated by the photovoltaic power generation device to directly power the electric vehicle.
[0040] Photovoltaic power generation devices include DC combiner boxes, inverters, and photovoltaic arrays. Photovoltaic arrays can be composed of multiple solar panels arranged in a preset manner to convert solar light into DC electricity. Inverters are converters that convert DC electricity into fixed-frequency and fixed-voltage or frequency-modulated and voltage-regulated AC electricity. In photovoltaic power generation systems, DC combiner boxes are wiring devices that ensure the orderly connection and convergence of photovoltaic components. This means that users can connect a certain number of photovoltaic cells of the same specifications in series to form photovoltaic strings, and then connect several photovoltaic strings in parallel to the photovoltaic combiner box. After convergence in the combiner box, they are used together through controllers, DC distribution cabinets, photovoltaic inverters, and AC distribution cabinets to form a complete photovoltaic power generation system and achieve grid connection with the city power grid.
[0041] Photovoltaic power distribution devices include photovoltaic grid-connected cabinets and branch boxes. The branch boxes can be used for cable branching and cable switching. Photovoltaic grid-connected cabinets are an electrical device dedicated to solar power generation systems that can play a protective and control role. They are one of the key devices for converting direct current generated by photovoltaic panels into alternating current that can be used by the power grid. The function of the photovoltaic grid-connected cabinet is to output electrical energy to the power grid and realize the grid-connected power generation of solar panel power generation systems.
[0042] The photovoltaic grid-connected cabinet is moved from the power distribution room to under the photovoltaic carport. The charging pile branch box is also conventionally installed under the photovoltaic carport. Now the two sets of equipment are integrated into one. By improving the design of the power distribution cabinet, the configuration of the charging pile branch box is integrated into the photovoltaic grid-connected cabinet, eliminating one charging pile branch box. The photovoltaic grid-connected cabinet is installed in the photovoltaic carport and connected to the power distribution room through a cable. The charging pile branch box is also installed under the photovoltaic carport. The charging pile branch box can draw power from the photovoltaic grid-connected cabinet, and photovoltaic power generation can also be used for charging piles. The charging pile branch box saves one cable for drawing power from the power distribution room. The main circuit breaker of the charging pile branch box is installed in the photovoltaic grid-connected cabinet, and no longer occupies the spare switch in the power distribution room.
[0043] Figure 2 This is a distribution system diagram of distributed photovoltaic power generation in an embodiment. In a specific embodiment, take the distance from the photovoltaic carport to the distribution room as 100 meters, the photovoltaic carport capacity as 400kW, and 9 AC charging piles as an example: a 800×1000×2200 grid-connected cabinet placement space is saved in the distribution room; a 250A spare circuit breaker does not need to be occupied in the distribution room; and a ZRC-YJV22-3×95+1×50mm is saved. 2The cable is 100 meters long, which saves about 30,000 yuan in cable and construction costs; it saves one charging pile branch box, saving about 3,000 yuan in costs; photovoltaic power generation can be achieved for local self-use.
[0044] Figure 3 This is a schematic diagram of power distribution for traditional photovoltaic power generation in an embodiment. The photovoltaic grid-connected cabinet is placed in the distribution room, taking up space. Cables need to be laid from the inverter to the photovoltaic grid-connected cabinet, and cables also need to be laid from the distribution room to the branch box. The photovoltaic installed capacity is generally larger than the branch box capacity of the charging pile. Photovoltaic power generation can charge the charging pile, so the existing solution has the problem of repeated laying of cables and increased costs for photovoltaic power generation and charging pile electricity use. The branch box of the charging pile needs to output a power supply from the distribution cabinet in the distribution room, and there may be no or insufficient spare switches in the distribution cabinet, which conflicts with the use of the charging pile.
[0045] In some embodiments of the present disclosure, the photovoltaic array, the DC combiner box, and the inverter are connected in sequence to form a photovoltaic power generation circuit.
[0046] The photovoltaic array captures sunlight, converts it into direct current, combines it through a DC combiner box, and converts the DC into alternating current through an inverter for use by charging piles and / or transmits it to a distribution room.
[0047] In some embodiments of the present disclosure, the photovoltaic power generation circuit is connected to the photovoltaic grid-connected cabinet and the power distribution room respectively.
[0048] The charging pile is connected to the photovoltaic grid-connected cabinet, the photovoltaic grid-connected cabinet is connected to the photovoltaic power generation circuit, and the charging pile branch box can draw power from the photovoltaic grid-connected cabinet or from the distribution room.
[0049] In some embodiments of the present disclosure, the branch box includes a main circuit breaker and a branch circuit breaker, and the main circuit breaker is installed in a photovoltaic grid-connected cabinet.
[0050] The main circuit breaker of the charging pile branch box is installed in the photovoltaic grid-connected cabinet and no longer occupies the spare switch in the distribution room.
[0051] In some embodiments of the present disclosure, the instantaneous current of the main circuit breaker is smaller than the short-circuit current of the branch circuit breaker.
[0052] In some embodiments of the present disclosure, the photovoltaic power generation device is connected to the photovoltaic power distribution device, and the photovoltaic power distribution device is connected to the charging pile.
[0053] The photovoltaic power generation device can transmit current to the photovoltaic distribution device, and the photovoltaic distribution device can transmit current to the charging pile for use.
[0054] In some embodiments of the present disclosure, the photovoltaic grid-connected cabinet includes a knife switch, a circuit breaker and a control element. One end of the photovoltaic grid-connected cabinet is connected to the charging cabinet, and the other end is connected to the distribution room.
[0055] Move the photovoltaic grid-connected cabinet to the photovoltaic carport, eliminate the branch box, and integrate the function of the branch box with the photovoltaic grid-connected cabinet, eliminating the cables of the charging pile branch box, the grid-connected cabinet position in the distribution room and the spare switch.
[0056] In some embodiments of the present disclosure, the power distribution room is used to transmit current to the city power grid and / or charging piles.
[0057] The power supply in the distribution room can be used for charging piles or transmitted to the power grid for storage.
[0058] In some embodiments of the present disclosure, the photovoltaic array is composed of a plurality of solar panels arranged in a preset manner, and the arrangement comprises at least a square array and a circular array.
[0059] Photovoltaic array refers to the connection of solar cell components and photovoltaic modules, which are combined in a certain arrangement, such as square array, circular array, etc., in order to better collect light energy for power generation and improve the utilization rate of light energy.
[0060] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.
[0061] In one embodiment of the present disclosure, a distributed photovoltaic power generation system is further provided, which may include the distributed photovoltaic power generation equipment described in any one of the above embodiments.
[0062] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0063] The above-described embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the attached claims.
Claims
1. A distributed photovoltaic power generation device, characterized in that: The distributed photovoltaic power generation device comprises: Photovoltaic carport and power distribution room; The photovoltaic carport includes a photovoltaic power generation device, a photovoltaic power distribution device, and a charging pile; The photovoltaic power generation device includes a DC combiner box, an inverter, and a photovoltaic array. The photovoltaic array is used to convert sunlight into DC power, and the photovoltaic power generation device is used to convert the DC power into AC power. The photovoltaic power distribution device comprises a photovoltaic grid-connected cabinet and a branch box, wherein the branch box is installed inside the photovoltaic grid-connected cabinet so that the branch box obtains the AC power of the charging pile through the photovoltaic grid-connected cabinet; The power distribution room is connected to the photovoltaic carport and is used to obtain the alternating current generated by the photovoltaic carport.
2. The distributed photovoltaic power generation device according to claim 1, characterized in that: The photovoltaic array, the DC combiner box, and the inverter are connected in sequence to form a photovoltaic power generation circuit.
3. The distributed photovoltaic power generation device according to claim 1, characterized in that: The photovoltaic power generation circuit is connected to the photovoltaic grid-connected cabinet and the power distribution room respectively.
4. The distributed photovoltaic power generation device according to claim 1, characterized in that: The branch box includes a main circuit breaker and a branch circuit breaker, and the main circuit breaker is installed in a photovoltaic grid-connected cabinet.
5. The distributed photovoltaic power generation device according to claim 4, characterized in that: The instantaneous current of the main circuit breaker is smaller than the short-circuit current of the branch circuit breaker.
6. The distributed photovoltaic power generation device according to claim 1, characterized in that: The photovoltaic power generation device is connected to the photovoltaic power distribution device, and the photovoltaic power distribution device is connected to the charging pile.
7. The distributed photovoltaic power generation device according to claim 1, characterized in that: The photovoltaic grid-connected cabinet comprises a knife switch, a circuit breaker and a control element. One end of the photovoltaic grid-connected cabinet is connected to the charging cabinet, and the other end is connected to the distribution room.
8. The distributed photovoltaic power generation device according to claim 1, characterized in that: The power distribution room is used to transmit electric current to the city power grid and / or charging piles.
9. The distributed photovoltaic power generation device according to claim 1, characterized in that: The photovoltaic array is composed of a plurality of solar panels arranged in a preset manner, and the arrangement manner includes at least a square array and a circular array.
10. A distributed photovoltaic power generation system, characterized in that: A distributed photovoltaic power generation device comprising any one of claims 1-9.