A box for installing photovoltaic grid-connected inverters

Abstract

The invention discloses a box body for installation of a photovoltaic grid-connected inverter. The box body is divided into a front bin and a back bin through a partition layer. In the front bin, a fixing plate (4) parallel to an upper plate body (31) is vertically-downward arranged on a top plate of a machine box. Two sides of the fixing plate (4) are fixedly connected with panels on two sides of the box body through screws. The fixing plate (4), the partition layer (3) and the panels on the two sides of the box body form a first heat dissipation air duct. A first fan set (10) is arranged at the bottom end, located on the fixing plate (4), of the partition layer (3). Heat dissipating holes (3) are formed in the top plate with the top end located on the machine box. An air inlet leading to the front bin (1) is formed in a front door plate (5) of the machine box. A second fan set (20) for air draft is arranged on the top plate of the machine box in the back bin (2). An air inlet (21) and an air inlet (22) which lead to the back bin (2) are respectively formed in the base plate and in the bottom peripheral side walls of the machine box. Compared with the prior art, the box body for the installation of the photovoltaic grid-connected inverter improves heat dissipation efficiency, prolongs the service life of fans and a machine, reduces risks and improves the performance of the machine.

Description

technical field [0001] The invention relates to the field of photovoltaic grid-connected inverters, in particular to a box for installing photovoltaic grid-connected inverters. Background technique [0002] Reactors, transformers, and IGBT power tubes are generally installed in photovoltaic grid-connected inverter cabinets. Most of the existing photovoltaic grid-connected inverter cabinets use a single air duct system for heat dissipation. The tube is placed in a chamber, and the heat is dissipated by means of heat dissipation fan pumping air, water circulation of water cooling pipes, etc. In the single air duct system, there are the following disadvantages: 1. Use the heat dissipation fan to pump air for heat dissipation, and the heat from the reactor, transformer and IGBT power tube will be transferred to each other, making it difficult to reduce the temperature at the IGBT power tube, affecting its life and quality. Efficiency, leading to derating. Furthermore, due to th...

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Problems solved by technology

In the single air duct system, there are the following disadvantages: 1. Use the heat dissipation fan to pump air for heat dissipation, and the heat from the reactor, transformer and IGBT power tube will be transferred to each other, making it difficult to reduce the temperature at the IGBT power tube, affecting its life and quality. Efficiency, leading to derating. Furthermore, due to the large amount of heat generated and the temperature rising, the life of the fan will be greatly reduced. Generally, the service life of high-power photovoltaic inverters is about 25 years. If you want to operate in a high-temperature environment , it is necessary to use fans with high performance requirements or high-power fans, which increases the cost; second, the use of water-cooled pipes for cooling heat, the system is complex, the maintenance cost is high, and the risk is high; It will cause secondary explosion of reactors and transformers; 4. The sine wave generated by the reactor and the square wave generated by the IGBT power tube interfere with each other and affect each other, which will reduce the performance of the machine; 5. Due to the single air duct, the control box cannot The pcb board, the power supply module inside the cabinet, the bus capacitor, the switch, the bus bar, the copper bar, etc. dissipate heat, which reduces the efficiency of the machine and even trips; The ability of transformers to resist dust is far greater than that of power components and circuit boards. If reactors and transformers are used as dust-proof systems, there will be more dust at power modules such as IGBTs. If dust-proof systems are used at IGBT power tubes , the wind resistance of the reactor and transformer will increase

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