Novel low-voltage photovoltaic grid-connected cabinet

Abstract

The utility model belongs to the technical field of photovoltaic power equipment, and particularly relates to a novel low-voltage photovoltaic grid-connected cabinet, which comprises a grid-connected cabinet main body, a capacitor chamber is fixedly arranged in the grid-connected cabinet main body, the capacitor chamber is fixedly arranged on one side in the grid-connected cabinet main body, and mounting strips A are fixedly arranged on two sides in the grid-connected cabinet main body. An installation strip B is fixedly installed between the two installation strips A. A molded case circuit breaker and an air switch are fixedly installed on the installation strip B. An inverter confluence busbar is fixedly installed on the upper end face of the molded case circuit breaker and the upper end face of the air switch. According to the utility model, the photovoltaic grid-connected cabinet is optimized, and the capacitor is directly connected to the position of the inverter bus bar where the inverter wire is located, so that the situation that the power factor is too low in the no-load process of the transformer is improved; the purposes of reducing the electric charge cost of the user and increasing the power generation efficiency are achieved.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic power equipment technology, specifically a new type of low-voltage photovoltaic grid-connected cabinet. Background Technology

[0002] With the rapid development of new energy technologies, especially photovoltaic (PV) energy, which is clean, renewable, and widely distributed, it has become an important direction for my country's energy transformation. Currently, most PV energy applications are in industrial and commercial sectors, using their own power distribution equipment and transformers to generate electricity, and most adopt a "self-consumption with surplus power fed into the grid" revenue model.

[0003] While this model can bring considerable benefits to developers, some problems will emerge in daily use. For example, after the photovoltaic grid is connected, if the user side operates under no-load or low-load conditions for a long period of time due to some reason, the power factor will be too low, resulting in a large power factor adjustment fee. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a novel low-voltage photovoltaic grid-connected cabinet, which solves the problems mentioned in the background technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A novel low-voltage photovoltaic grid-connected cabinet includes a main body, a capacitor compartment fixedly installed inside the main body, the capacitor compartment being fixedly installed on one side inside the main body, mounting strips A being fixedly installed on both sides inside the main body, mounting strip B being fixedly installed between the two mounting strips A, a molded case circuit breaker and an air switch being fixedly installed on the mounting strip B, an inverter busbar being fixedly installed on the upper surface of the molded case circuit breaker and the air switch, a vertical busbar inside the cabinet being fixedly installed on the upper side of the inverter busbar, and a wire being provided between the air switch and the capacitor compartment.

[0006] As a preferred embodiment of this utility model, the capacitor chamber is provided with a wire for passing through the inlet hole. The wire is fixedly connected to a small three-phase capacitor inside the capacitor chamber. A ventilation hole is fixedly installed on the side of the capacitor chamber near the main body of the grid-connected cabinet. An exhaust fan is also fixedly installed at the ventilation hole. A door is also fixedly installed on one side of the capacitor chamber.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] 1. This utility model improves the situation where the power factor of the transformer is too low during no-load operation by optimizing the photovoltaic grid-connected cabinet and directly connecting the capacitor to the inverter busbar where the inverter wires are located.

[0009] 2. This utility model achieves the goal of reducing users' electricity costs and increasing power generation efficiency. Attached Figure Description

[0010] Figure 1 This is a sectional view of the grid-connected cabinet;

[0011] Figure 2 3D view of the capacitor room.

[0012] In the diagram: 1. Main body of grid-connected cabinet; 2. Vertical busbar inside the cabinet; 3. Inverter busbar; 4. Air switch; 5. Wire; 6. Inlet hole; 7. Small three-phase capacitor; 8. Capacitor compartment; 9. Exhaust fan; 10. Compartment door; 11. Ventilation hole; 12. Molded case circuit breaker. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0014] Please see Figure 1-2 This utility model provides the following technical solution: A novel low-voltage photovoltaic grid-connected cabinet includes a grid-connected cabinet body 1. A capacitor chamber 8 is fixedly installed inside the grid-connected cabinet body 1. The capacitor chamber 8 is fixedly installed on one side inside the grid-connected cabinet body 1. Mounting strips A are fixedly installed on both sides inside the grid-connected cabinet body 1. Mounting strip B is fixedly installed between the two mounting strips A. A molded case circuit breaker 12 and an air switch 4 are fixedly installed on the mounting strip B. An inverter busbar 3 is fixedly installed on the upper end face of the molded case circuit breaker 12 and the air switch 4. A cabinet vertical busbar 2 is fixedly installed on the upper side of the inverter busbar 3. A wire 5 is provided between the air switch 4 and the capacitor chamber 8. A wire 5 for passing through the inlet hole 6 is provided on the capacitor chamber 8. The wire 5 is fixedly connected to a small three-phase capacitor 7 inside the capacitor chamber 8. A ventilation hole 11 is fixedly installed on the side of the capacitor chamber 8 near the grid-connected cabinet body 1. An exhaust fan 9 is also fixedly installed at the ventilation hole 11. A door 10 is also fixedly installed on one side of the capacitor chamber 8.

[0015] In this implementation plan, assuming the user's transformer capacity is 630kVA and two photovoltaic grid-connected cabinets are configured, the reactive power loss of the transformer under no-load conditions is approximately 4kVar. At this time, the user's capacitor bank controller cannot detect the load current and will not be put into operation. If the user operates under no-load or low-load conditions for a long period of time, it will result in a low power factor for the user, generating a large amount of power factor adjustment fees. Based on this circuit principle, the manufacturer can install a 2kVar capacitor in each grid-connected cabinet during production. The capacitor is connected to the busbar of the inverter cable via a cable, and only an air switch is required. The capacitor can be placed directly in the capacitor compartment of the grid-connected cabinet. If the user is under no-load conditions, the grid-connected cabinet capacitor will directly compensate. If the user is operating under load, the capacitor and the user's capacitor bank will jointly compensate. Furthermore, compensation can still be performed after the photovoltaic system stops generating electricity at night, thereby achieving the goal of improving the power factor.

[0016] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A novel low-voltage photovoltaic grid-connected cabinet, comprising a main body (1), characterized in that: A capacitor compartment (8) is fixedly installed inside the main body (1) of the grid-connected cabinet. The capacitor compartment (8) is fixedly installed on one side inside the main body (1). Mounting strips A are fixedly installed on both sides inside the main body (1). Mounting strip B is fixedly installed between the two mounting strips A. A molded case circuit breaker (12) and an air switch (4) are fixedly installed on the mounting strip B. An inverter busbar (3) is fixedly installed on the upper surface of the molded case circuit breaker (12) and the air switch (4). A vertical busbar (2) inside the cabinet is fixedly installed on the upper side of the inverter busbar (3). A wire (5) is provided between the air switch (4) and the capacitor compartment (8).

2. The novel low-voltage photovoltaic grid-connected cabinet according to claim 1, characterized in that: The capacitor chamber (8) is provided with a wire (5) for passing through the inlet hole (6). The wire (5) is fixedly connected to a small three-phase capacitor (7) inside the capacitor chamber (8). A ventilation hole (11) is fixedly installed on the side of the capacitor chamber (8) near the grid-connected cabinet body (1). An exhaust fan (9) is also fixedly installed at the ventilation hole (11). A door (10) is also fixedly installed on one side of the capacitor chamber (8).

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