High-power-density three-phase photovoltaic inverter

Abstract

The utility model discloses a high-power density three-phase photovoltaic inverter, which belongs to the technical field of inverter heat dissipation and comprises a case, a sheet metal surface cover is mounted at the top of the case, an inverter main body structure is mounted in an inner cavity of the case, a heat radiator is mounted at the bottom of the inverter main body structure, air outlets are formed in two sides of the case, and the heat radiator is mounted in the case. According to the utility model, the three groups of high-speed fans are arranged to quickly form high-speed airflow in the case, the high-speed airflow is utilized to drive heat in the case to be discharged, and then the radiator installed at the bottom of the inverter main body structure can quickly conduct the heat in the inverter main body structure to the outside. The operation panel, the direct current contactor, the electrolytic capacitor, the resistor and the IGBT module which are arranged on the inverter main body structure work and run at a proper temperature, and compared with a passive heat dissipation mode adopted by a traditional inverter, the mode that the high-speed fan is matched with the heat dissipation device is adopted, so that heat dissipation is more efficient and rapid.

Description

Technical Field

[0001] The utility model relates to the technical field of inverter heat dissipation, in particular to a three-phase photovoltaic inverter with high power density. Background Technique

[0002] A photovoltaic inverter can convert the variable DC voltage generated by a photovoltaic (PV) solar panel into commercial power frequency alternating current (AC). It can be fed back into the commercial power transmission system or used for an off-grid power grid. The photovoltaic inverter is one of the important balance of system (BOS) in the photovoltaic array system and can be used with equipment powered by general alternating current. The solar inverter has special functions to cooperate with the photovoltaic array.

[0003] The photovoltaic inverter is an important device in photovoltaic power generation. The photovoltaic inverter needs to integrate a variety of electrical components, resulting in a compact internal structure of the inverter and a relatively high design power, which means that the heat generated during the operation of the inverter is relatively large. The traditional inverter heat dissipation structure cannot meet the requirements of a three-phase photovoltaic inverter with high power density. A large amount of heat generated accumulates inside the inverter, which easily causes the inverter to become hot, and then the internal circuit is prone to damage when continuously operating at high temperatures. Content of the Utility Model

[0004] The purpose of the utility model is to provide a three-phase photovoltaic inverter with high power density. A radiator is installed below the main structure of the inverter to quickly dissipate the heat inside the main structure of the inverter to the outside. Then, a high-speed fan is installed at the end of the chassis and an air outlet is opened on the outside of the chassis. The high-speed fan is used to drive the air to flow quickly to cope with the heat generated by the three-phase photovoltaic inverter with high power density, so as to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A three-phase photovoltaic inverter with high power density, including a chassis, a sheet metal face cover is installed on the top of the chassis, an inverter main structure is installed in the inner cavity of the chassis, a radiator is installed at the bottom of the inverter main structure, air outlets are opened on both sides of the chassis, a fan mounting seat is installed at one end of the chassis, three groups of high-speed fans are installed on the fan mounting seat, a support seat is installed at the end of the chassis far from the fan mounting seat, the support seat supports the inverter main structure, and an air outlet is also provided on the support seat. An operation panel, a DC contactor, a rectifier bridge, electrolytic capacitors, resistors, and IGBT modules are respectively installed on the inverter main structure.

[0006] Preferably, a wire outlet is opened on the fan mounting seat, and the wire outlet is located above the high-speed fan.

[0007] Preferably, four wire inlets are opened above the air outlet on the support seat, and silica gel protective wire sleeves are sleeved in the wire inlets.

[0008] Preferably, mounting angle brackets are fixed on both sides of the inner cavity of the chassis, and the main structure of the inverter is fixedly connected to the mounting angle brackets through mounting screws.

[0009] Preferably, the sheet metal face cover is snap-fitted to the top of the chassis, and the sheet metal face cover is fixedly connected to both sides of the top of the chassis through mounting screws.

[0010] Preferably, a heat dissipation space is reserved between the main structure of the inverter and the bottom of the inner cavity of the chassis, and the air outlet is located below the main structure of the inverter.

[0011] Preferably, auxiliary heat dissipation holes are also provided on both sides of the chassis, and the auxiliary heat dissipation holes are located above the main structure of the inverter.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] By arranging three groups of high-speed fans in the present utility model, a high-speed air flow can be quickly formed in the chassis, and the heat inside the chassis is driven to be discharged by the high-speed air flow. Then, the radiator installed at the bottom of the main structure of the inverter can quickly conduct the heat inside the main structure of the inverter to the outside, so that the operation panel, DC contactor, electrolytic capacitor, resistor and IGBT module provided on the main structure of the inverter work and operate at an appropriate temperature. Compared with the traditional inverter using passive heat dissipation, the combination of high-speed fans and radiators is adopted, making the heat dissipation more efficient and rapid.

[0014] By limiting the position of the main structure of the inverter inside the chassis in the present utility model, sufficient space is ensured around the main structure of the inverter, enabling the air flow to flow quickly and taking away the excess heat to achieve the purpose of rapid cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0016] Figure 2 is a partial three-dimensional structural schematic diagram of the present utility model.

[0017] Reference numerals in the figures: 1, chassis; 2, sheet metal face cover; 3, main structure of the inverter; 4, radiator; 5, air outlet; 6, fan mounting seat; 7, high-speed fan; 8, support seat; 9, operation panel; 10, DC contactor; 11, rectifier bridge; 12, electrolytic capacitor; 13, resistor; 14, IGBT module; 15, wire outlet; 16, wire inlet; 17, silicone protective wire sleeve; 18, mounting angle bracket; 19, auxiliary heat dissipation hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0019] The present utility model provides a high-power density three-phase photovoltaic inverter as Figures 1-2 shown, which includes a chassis 1. A sheet metal face cover 2 is installed on the top of the chassis 1. An inverter main body structure 3 is installed in the inner cavity of the chassis 1. A radiator 4 is installed at the bottom of the inverter main body structure 3. Air outlets 5 are provided on both sides of the chassis 1. A fan mounting seat 6 is installed at one end of the chassis 1. Three groups of high-speed fans 7 are installed on the fan mounting seat 6. A support seat 8 is installed at the end of the chassis 1 away from the fan mounting seat 6. The support seat 8 supports the inverter main body structure 3. An air outlet 5 is also provided on the support seat 8. An operation panel 9, a DC contactor 10, a rectifier bridge 11, an electrolytic capacitor 12, a resistor 13, and an IGBT module 14 are respectively installed on the inverter main body structure 3;

[0020] By setting three groups of high-speed fans 7, a high-speed air flow can be quickly formed in the chassis 1, and the heat inside the chassis 1 can be driven out by the high-speed air flow. Then, the radiator 4 installed at the bottom of the inverter main body structure 3 can quickly conduct the heat inside the inverter main body structure 3 to the outside, enabling the operation panels 9, DC contactors 10, electrolytic capacitors 12, resistors 13, and IGBT modules 14 provided on the inverter main body structure 3 to work and operate at an appropriate temperature. Compared with the traditional inverter using passive heat dissipation, the combination of high-speed fans 7 and radiators 4 makes the heat dissipation more efficient and rapid.

[0021] An outlet 15 is provided on the fan mounting seat 6. The outlet 15 is located above the high-speed fan 7. Providing the outlet 15 on the fan mounting seat 6 facilitates the extension of the wire from the inside of the device to the outside. At the same time, the outlet 15 and the high-speed fan 7 are located on the upper and lower sides of the inverter main body structure 3. By using the outlet 15 to connect the inside and outside of the chassis 1 and cooperating with the high-speed fan 7, a swirling air flow is formed inside the chassis 1 and discharged from the outlet 15.

[0022] Four groups of inlet ports 16 are provided on the support seat 8 above the air outlet 5. A silica gel protective wire sleeve 17 is sleeved inside the inlet ports 16. The inlet ports 16 can cooperate with the incoming lines of the three-phase photovoltaic inverter, and then the silica gel protective wire sleeve 17 protects the incoming lines to prevent the support seat 8 from contacting and wearing the incoming lines.

[0023] On both sides of the inner cavity of the chassis 1, mounting angle brackets 18 are fixed. The main structure 3 of the inverter is fixedly connected to the mounting angle brackets 18 through mounting screws. Through the setting of the mounting angle brackets 18, it is convenient to install the main structure 3 of the inverter inside the chassis 1, so that there is enough space above and below the main structure 3 of the inverter, which is convenient for heat to diffuse from the inside of the main structure 3 of the inverter to the outside.

[0024] The sheet metal face cover 2 is snap - connected to the top of the chassis 1. The sheet metal face cover 2 is fixedly connected to both sides of the top of the chassis 1 through mounting screws. Through the mounting screws, the sheet metal face cover 2 can be disassembled and assembled with the chassis 1, which is convenient for disassembling and repairing the inverter.

[0025] A heat dissipation space is reserved between the main structure 3 of the inverter and the bottom of the inner cavity of the chassis 1. The air outlet 5 is located below the main structure 3 of the inverter. Through the limitation of the position of the air outlet 5, it is ensured that the airflow driven by the high - speed fan 7 forms a passage below the main structure 3 of the inverter, and the heat at the bottom of the main structure 3 of the inverter can be quickly discharged.

[0026] Auxiliary heat dissipation holes 19 are also opened on both sides of the chassis 1. The auxiliary heat dissipation holes 19 are located above the main structure 3 of the inverter. Through the auxiliary heat dissipation holes 19, the heat in the top space of the main structure 3 of the inverter is dissipated.

[0027] During specific use, after the inverter is assembled and connected to the photovoltaic power generation system, since the electrical components on the main structure 3 of the inverter generate heat during operation, at this time, the radiator 4 diffuses the heat inside the main structure 3 of the inverter to the inside of the chassis 1. Then the high - speed fan 7 rotates, introducing the air outside the chassis 1 into the chassis 1 and flowing from the lower side of the main structure 3 of the inverter to the other side. The heat is transferred along with the airflow. Part of the heat diffuses out through the air outlet 5, and there is also a part of the airflow that forms a swirling airflow inside the chassis 1, rotates from above the main structure 3 of the inverter, and then discharges from the wire outlet 15. At the same time, the auxiliary heat dissipation holes 19 can also assist in dissipating heat from the inverter.

[0028] A high - power - density three - phase photovoltaic inverter:

[0029] 1. Adopt an independently optimized MPPT algorithm and an independently innovated high - precision bus constant - voltage algorithm;

[0030] 2. Adopt a constant - voltage tracking (CVT) control method;

[0031] 3. Through the design of controlling the current change step size;

[0032] 4. Adopt fuzzy recognition and closed - loop control, so that the working point of the photovoltaic array is always fixed within the constant - current source region;

[0033] 5. The main circuit adopts an intelligent power module, with high reliability and a conversion efficiency of 96%;

[0034] 6. The maximum power point obtained by reasonably applying the energy optimization algorithm is used for negative feedback regulation, greatly improving the overall efficiency of the photovoltaic water pump system and solving the application problem of AC asynchronous motors in photovoltaic water pumps.

[0035] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-phase photovoltaic inverter with high power density, comprising a chassis (1), characterized in that: A sheet metal face cover (2) is installed on the top of the chassis (1). An inverter main structure (3) is installed in the inner cavity of the chassis (1). A radiator (4) is installed at the bottom of the inverter main structure (3). Air outlets (5) are provided on both sides of the chassis (1). A fan mounting base (6) is installed at one end of the chassis (1). Three high-speed fans (7) are installed on the fan mounting base (6). A support base (8) is installed at the end of the chassis (1) away from the fan mounting base (6). The support base (8) supports the inverter main structure (3). An air outlet (5) is also provided on the support base (8). An operation panel (9), a DC contactor (10), a rectifier bridge (11), an electrolytic capacitor (12), a resistor (13), and an IGBT module (14) are respectively installed on the inverter main structure (3).

2. The high-power density three-phase photovoltaic inverter according to claim 1, wherein: A wire outlet (15) is provided on the fan mounting base (6), and the wire outlet (15) is located above the high-speed fan (7).

3. A high-power density three-phase photovoltaic inverter according to claim 1, characterized in that: Four wire inlets (16) are provided above the air outlet (5) on the support base (8), and a silica gel protective wire sleeve (17) is sleeved in the wire inlets (16).

4. A high-power density three-phase photovoltaic inverter according to claim 1, characterized in that: Mounting angle brackets (18) are fixed on both sides of the inner cavity of the chassis (1), and the inverter main structure (3) is fixedly connected to the mounting angle brackets (18) through mounting screws.

5. A high-power density three-phase photovoltaic inverter according to claim 1, characterized in that: The sheet metal face cover (2) is snap-connected to the top of the chassis (1), and the sheet metal face cover (2) is fixedly connected to both sides of the top of the chassis (1) through mounting screws.

6. A high-power density three-phase photovoltaic inverter according to claim 1, characterized in that: A heat dissipation space is reserved between the inverter main structure (3) and the bottom of the inner cavity of the chassis (1), and the air outlet (5) is located below the inverter main structure (3).

7. A high-power density three-phase photovoltaic inverter according to claim 1, characterized in that: Auxiliary heat dissipation holes (19) are also provided on both sides of the chassis (1), and the auxiliary heat dissipation holes (19) are located above the inverter main structure (3).

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