Contravariant cabinet used for photovoltaic inverter

Abstract

The invention discloses a contravariant cabinet used for a photovoltaic inverter. The contravariant cabinet comprises an electric reactor module and further comprises an electric reactor, a first fan and a first air flue, wherein the electric reactor module is arranged below the contravariant cabinet and is arranged in the first air flue; the first fan is arranged above the electric reactor; the first air flue is used for isolating the electric reactor from other elements in the contravariant cabinet and communicating the first air inlet with the first air outlet in the contravariant cabinet; and the air is sucked in from the first air inlet by the first fan, only flows through the first air flue and is discharged out from the first air outlet.

Description

technical field [0001] This application relates to the field of power electronics, in particular to an inverter cabinet for photovoltaic inverters, such as an inverter cabinet for high-power photovoltaic inverters, wind power converters, frequency converters, UPS, and EPS. cabinet. Background technique [0002] In the field of power electronics, especially in high-power (above 200kW) photovoltaic inverters, wind power converters, UPS, and EPS products, the main power part is composed of capacitors, power modules, radiators, fans, reactors, and control parts. and other key components, and the quantity is large and the volume is large, there are many combinations in the design structure, the current power electronics industry usually uses the reactor to be placed below, and the power module, heat sink, control part, and capacitor are combined together. The design scheme of the upper part of the variable cabinet. [0003] figure 1 , figure 2 , image 3 A schematic front v...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned all-in-one machine (such as Figure 1-3 As shown) the disadvantages are: the left and right are too wide, the installation space is large, the fuselage is very bulky and inconvenient to install; the reactor is installed at the bottom of the fuselage, which reduces the air intake of the cooling air duct of the capacitor and power module, and the reactor All the heat generated during work passes through the capacitor and the radiator of the power module, which increases the working environment temperature of the capacitor and the power module, which is not conducive to its heat dissipation; because the reactor is a source of interference for the whole machine, and its air duct and control PCB board are not Isolation, so that the control PCB board is not well shielded from the outside world, and the reactor will cause certain interference to the control components of the machine and external electronic equipment, which will reduce the stability of the whole machine and the system, and the working noise of the reactor cannot be shielded. Inside the fuselage, it will spread to the outside, increasing the noise pollution to the working environment; as far as the whole system is concerned, the greater the power, the more cooling fans will be used, which also increases the failure rate from the hardware point of view; and The reactor and the air duct of the control PCB board are connected, and the flying dust is easy to accumulate on the control device, which increases the failure rate

[0006] The above-mentioned power units are installed in cabinets and paralleled (such as Figure 4 As shown), the disadvantages are: the reactor is at the bottom of the power inverter cabinet, and all the heat generated during its operation is sucked by the fan of the power unit and passes through the power module inside the unit, which is not conducive to heat dissipation for capacitors and control components; the power unit Fans usually have two-way air intake from front to back, and there is usually no air intake at the back of the cabinet, so the air intake from the front and back of the fan is not equal, which seriously affects the performance of the fan; the power modules inside the power unit are three-phase A, B, and C. Large, a centrifugal fan is in the middle of the bottom, blowing and dissipating heat to it, and the width of the air outlet of the fan is much smaller than the width of the three phases A, B, and C of the power module, which will cause a large difference in the air volume passing through the three phases A, B, and C , forming an unbalanced ABC three-phase heat dissipation, which seriously affects the performance of the whole machine; the fan, power module, heat sink, capacitor, and control components are combined into a power unit, which is very heavy, and the larger the power of the unit, the heavier it is, and it is very difficult to maintain; and because The internal structure of the power unit is very compact. When one of the internal components is damaged, it is easy to damage other components and expand the fault.

Images