CN217984999U - Micro device for purifying distributed photovoltaic power generation power supply - Google Patents

Abstract

The utility model relates to the technical field of photovoltaic power generation, in particular to a miniature device for purification of distributed photovoltaic power generation, including a box body, a baffle is installed on one end of the box, and an air outlet is opened on the surface of the baffle. A fan is installed on the inner side of the board, a dust-proof board is installed on the other end of the box body, and a wiring board is installed on the bottom of the box body near the dust-proof board. Several transformer wiring, main circuit wiring, and data wiring are arranged in sequence on the wiring board. The micro-device used for purification of distributed photovoltaic power generation can be installed in parallel at the grid-connected points of distributed photovoltaics in parallel with multi-modules according to the installed capacity of distributed photovoltaics. In-situ compensation, reducing the flow of reactive current on the line, reducing losses, and improving the power factor of the outlet of the distribution transformer. The installation is simple and convenient, and the heat can be dissipated in time, and the wiring is also relatively convenient, which can facilitate installation and use.

Description

A micro-device for purification of distributed photovoltaic power generation

technical field

The utility model relates to the technical field of photovoltaic power supply equipment, in particular to a miniature device for purification of distributed photovoltaic power supply.

Background technique

In recent years, my country's renewable energy development has shown a sustained medium-to-high-speed growth trend, with a rapid development momentum. Distributed photovoltaic is a kind of abundant and clean renewable energy. It has the characteristics of adapting measures to local conditions, clean and efficient, decentralized layout, and nearby utilization. It is noiseless, convenient for construction and promotion, relatively long in life, and easy to maintain. It can be used in family houses. Direct installation takes advantage of many distributed power sources. At present, some provinces have started the work related to the promotion of photovoltaic power generation in the whole county. In the future, there will be great room for the development of distributed photovoltaic in rural areas, and the high penetration of photovoltaic access will have a huge impact on rural distribution networks.

However, we regard the distributed photovoltaic power generation system as a small power system, in which the proportion of non-linear loads and power electronic devices is much higher than that of the large power grid. Therefore, compared with the large power grid, the problem of harmonic pollution in the photovoltaic power generation system is also If it is more serious, it is also very difficult to manage, and it will bring serious negative problems to the distribution network.

At present, for the power quality problems caused by distributed photovoltaic grid connection, the traditional solution generally adopts the installation of active filter APF or static var generator SVG on the outlet bus of distribution transformer for centralized management. The method of installing an active filter APF or a static var generator SVG on the substation busbar for centralized management, although it prevents the harmonics generated by photovoltaic power generation from flowing to the grid and polluting the grid, it does not affect other utilities in the distribution area. Electrical equipment poses a great threat, and when centralized management is adopted, the selected treatment equipment is large in size, heavy in weight, high in cost, and inconvenient to install. The heat dissipation effect of the device is not good. Long-term work is likely to cause temperature rise and cannot be discharged in time, and the wiring is not enough. Convenience.

Utility model content

The purpose of this utility model is to provide a micro-device for purification of distributed photovoltaic power generation to solve the problems raised in the above-mentioned background technology.

In order to achieve the above purpose, the utility model provides a micro-device for purification of distributed photovoltaic power generation, including a box body, a baffle plate is installed at one end of the box body, and an air outlet is opened on the surface of the baffle plate. A fan is installed on the inside of the baffle, a dustproof plate is installed at the other end of the box body, and a terminal board is installed at the bottom of one end of the box body close to the dustproof plate, and several transformers are arranged on the terminal board in sequence Wiring, main circuit wiring, data wiring.

Preferably, mounting plates are provided on the bottoms of both sides of the box body, and several mounting holes are opened on the surface of the mounting plate.

Preferably, the end of the box body is located on both sides of the dust-proof plate and a protective plate is installed, and a card slot is vertically opened on the surface of the protective plate.

Preferably, a detachable cover is installed on the top of the box.

Preferably, a cable management board is installed inside the box close to the dustproof board, and several cable management holes are opened on the surface of the cable management board.

Preferably, the surface of the dust-proof plate is provided with several ventilation holes.

Compared with the prior art, the utility model has the beneficial effects:

The micro-device used for the purification of distributed photovoltaic power generation can be installed in parallel at the grid-connected point of distributed photovoltaics in a multi-module parallel manner according to the installed capacity of distributed photovoltaics, that is, before photovoltaic power generation is connected to the grid, the The harmonics generated in the power generation process are filtered out, which not only avoids the harm of the harmonics injected into the power grid to others in the power grid, but also avoids the impact on the electrical equipment in the station area. It can also make local compensation for the lack of reactive power in the system, reduce the flow of reactive current on the line, reduce losses, and improve the power factor of the distribution transformer outlet. The device is small in size, only the size of a book, light in weight, simple and convenient to install, heat can be dissipated in time, wiring is also relatively convenient, and can be conveniently installed and used.

Description of drawings

Fig. 1 is one of overall structural representation of the utility model;

Fig. 2 is the second overall structure schematic diagram of the utility model;

Fig. 3 is a schematic diagram of the internal structure of the utility model.

The meanings of each symbol in the figure are:

1. Box body; 11. Mounting plate; 111. Mounting hole; 12. Baffle plate; 121. Air outlet; 13. Protective plate; 131. Card slot; 14. Dustproof plate; 15. Detachable cover plate; 2. Fan; 3. Wiring board; 31. Transformer wiring; 32. Main circuit wiring; 33. Data wiring; 4. Wiring board; 41. Wiring hole.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", Orientation indicated by "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. Or the positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and operation, and therefore cannot be construed as limiting the utility model.

Example 1

The utility model provides a micro-device for purification of distributed photovoltaic power supply, as shown in Figure 1-Figure 3, including a box body 1, a baffle 12 is installed on one end of the box body 1, and the surface of the baffle 12 is provided with The air outlet 121 is used for heat discharge. The inside of the baffle plate 12 is equipped with a fan 2 for blowing out the hot air inside the box body 1. The other end of the box body 1 is installed with a dust-proof plate 14 to play a dust-proof effect. A wiring board 3 is installed on the bottom of the box body 1 near the dustproof plate 14. Several transformer wirings 31, main circuit wirings 32, and data wirings 33 are arranged in sequence on the wiring board 3. The data wirings 33 include emergency stop signal wiring, node Signal wiring, communication interface wiring.

In this embodiment, the bottom of both sides of the box body 1 is provided with mounting plates 11 , and the surface of the mounting plate 11 is provided with several mounting holes 111 for the overall installation and fixing of the box body 1 .

Specifically, the end of the box body 1 is located on both sides of the dust-proof plate 14, and the protective plate 13 is installed. The surface of the protective plate 13 is vertically provided with a slot 131, which is used for the dust-proof plate 14 to be stuck vertically from top to bottom. Fixed, convenient for installation and disassembly of the dustproof plate 14, convenient for cleaning in time.

Further, a detachable cover plate 15 is installed on the top of the box body 1 to facilitate the disassembly and assembly of the internal equipment of the box body 1 .

Further, the inside of the box body 1 is equipped with a wire management board 4 near the dustproof board 14, and a number of wire management holes 41 are provided on the surface of the wire management board 4, so as to facilitate the sorting of the wires and ensure that the wires do not interfere with each other.

Example 2

In order to further ensure the heat dissipation effect, on the basis of Embodiment 1, the surface of the dustproof plate 14 is provided with a number of ventilation holes to facilitate the entry of external air at normal temperature and discharge after exchanging heat.

Furthermore, SiC MOSFETs, dual-core high-speed DSP controllers, Hall current sensors, and intermediate relays are also installed inside the box body 1. Since the impedance of the drift layer of SiC devices is lower than that of Si devices, it can be used without conductivity modulation. High frequency device structure MOSFET realizes high withstand voltage and low impedance. Moreover, MOSFETs do not generate tail current in principle, so when replacing IGBTs with SiC MOSFETs, switching losses can be significantly reduced and heat dissipation components can be miniaturized. In addition, SiC MOSFETs can be driven under high-frequency conditions where IGBTs cannot work, so that miniaturization of passive devices can also be realized. Compared with Si MOSFETs of 600V to 1200V, the advantage of SiC MOSFETs is that the chip area is small (small packages can be realized), and the recovery loss of the body diode is very small. The processor of the device adopts a dual-core high-speed DSP controller, which can make the AC signal track without static error and make the system have high anti-interference performance.

Further, the device can achieve low loss of the device and miniaturization of heat dissipation components, so that the entire device is greatly reduced in size (only the size of a book), and the dual-core high-speed DSP controller is used to make the AC signal track without static Poor, with high anti-interference performance in operation. In terms of application, it is mainly used at the grid-connected point of distributed photovoltaic power generation. The corresponding capacity of this device can be configured according to the installed capacity of photovoltaic power generation (this device supports multi-machine parallel operation), and there is no special requirement for the installation location, so it is easy to install fast. The device can fine-tune the power quality problems (mainly reactive power and harmonic problems) generated in the distributed photovoltaic power generation process on the spot, so that the distributed photovoltaic power generation system can be purified at the source as a power source, so that the power grid can operate more stably and safely .

When the micro-device for purification of distributed photovoltaic power supply of the present utility model is in use, first install and fix the device, and after the box body 1 is fixed through the installation plate 11, the detachable cover plate 15 is opened, and the process is carried out through the wiring board 3. Connect the wires through the wire management board 4 and connect them with the internal components of the box body 1, then install the detachable cover plate 15, open the device to work after installation, and blow the internal components of the box body 1 through the fan 2 during work. The hot air is blown out to ensure timely heat dissipation.

Finally, it should be noted that the SiC MOSFET, dual-core high-speed DSP controller, Hall current sensor, intermediate relay, etc. in this embodiment, the electronic components in the above components are all general standard components or components known to those skilled in the art , its structure and principle can be learned by those skilled in the art through the technical manual or through conventional experimental methods. In the idle place of the device, connect all the above-mentioned electrical devices through wires. The specific connection means should refer to the above work In principle, the electrical connections between the electrical devices are completed sequentially, which is a well-known technology in the art.

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the industry should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions are only preferred examples of the utility model, and are not used to limit the utility model. Without departing from the utility model Under the premise of the spirit and scope, the utility model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (6)

1. The utility model provides a micro device for distributed photovoltaic power generation power purifies, includes box body (1), its characterized in that: baffle (12) are installed to the one end of box body (1), air outlet (121) have been seted up on the surface of baffle (12), fan (2) are installed to the inboard of baffle (12), dust guard (14) are installed to the other end of box body (1), box body (1) is close to the one end bottom of dust guard (14) and installs wiring board (3), a plurality of mutual-inductors wiring (31), main circuit wiring (32), data wiring (33) have set gradually on wiring board (3).

2. A micro device for distributed photovoltaic power generation purification, according to claim 1, wherein: the box body (1) is characterized in that mounting plates (11) are arranged at the bottoms of the two sides of the box body, and a plurality of mounting holes (111) are formed in the surfaces of the mounting plates (11).

3. A micro device for distributed photovoltaic power generation purification, according to claim 1, wherein: protection plates (13) are installed on two sides, located on the dust guard (14), of the end of the box body (1), and clamping grooves (131) are vertically formed in the surfaces of the protection plates (13).

4. A micro device for distributed photovoltaic power generation purification, according to claim 1, wherein: the top of the box body (1) is provided with a detachable cover plate (15).

5. The microdevice for distributed photovoltaic power generation decontamination as recited in claim 1, wherein: the wire arranging plate is characterized in that a wire arranging plate (4) is arranged in the box body (1) and close to the dust-proof plate (14), and a plurality of wire arranging holes (41) are formed in the surface of the wire arranging plate (4).

6. A micro device for distributed photovoltaic power generation purification, according to claim 1, wherein: the surface of the dust guard (14) is provided with a plurality of air holes.

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