Photovoltaic inverter as the core of photovoltaic power station, its life affects the normal operation of the whole power station, and the heat dissipation performance of inverter has the greatest impact on device life. How much do you know about the heat dissipation of PV inverter? Today, Zhan Yu baby will talk about the heat dissipation of inverter.
1.Why does an inverter have heat dissipation
The components in the inverter have the rated working temperature. If the inverter\'s heat dissipation performance is poor, when the inverter works, the heat of the component is always gathered inside the cavity, and the temperature will be higher and higher. Too high temperature can reduce the performance and life of components, and the machine is prone to failure.
When the inverter works heat, the power loss is unavoidable. For example, a 5kW inverter has a system heat loss of about 75-125W, which affects the power generation. It is necessary to reduce heat dissipation by optimizing the heat dissipation design.
2. Heat dissipation mode of inverter
Natural heat dissipation:
Natural heat dissipation means that it does not use any external auxiliary energy, allowing local heating devices to heat the surrounding environment, so as to achieve temperature control. Natural heat dissipation is suitable for low power devices with low temperature control.
Forced air cooling:
The cooling method of forced heat dissipation is mainly a method of taking away the heat emitted from the device by means of a fan. At present, the radiator material is mainly aluminum or copper.
3. How to choose the appropriate heat dissipation mode.
Generally, the temperature rise of the electronic device is between 40-60 degrees. When the temperature rises 60 degrees, the natural cooling can bear the heat flux of 0.05W/cm2. When the heat flux is greater than 0.05W/cm2, the forced air cooling mode is a good choice at the economic and performance level. If heat flux continues to increase, other cooling methods such as liquid cooling are needed.
4. The latest heat dissipation technology
With the continuous development of electronic technology, the inverter has made great progress in the field of heat dissipation.
Division management:
The most easily affected devices in the inverter are the operation amplifier, the sensor, the electrolytic capacitor and so on. The inductance, the cable and the power switch tube are more resistant to heat. The heating components can be separated by the method of dividing the cavity. The power of the heating device, such as the inductance, is placed outside the inverter, and the temperature in the chassis can be reduced. At the same time, the integral shell structure can be used, the radiator and the shell are closely connected, so that the aluminum alloy shell is dissipating through two paths, thus reducing the temperature of the components and the internal temperature of the inverter, so as to ensure the longer service life of the components and inverters.
The simulation technology of heat dissipation:
The simulation software can simulate the thermal condition of the system more realistically. In the process of design, the working temperature of each component can be predicted. In this way, the unreasonable structure of the inverter can be corrected, thus the design period, the cost and the first power of the product can be reduced.
Application of new heat dissipating materials:
For example, steel radiator, aluminum alloy radiator, copper radiator, copper aluminum composite radiator, steel aluminum composite radiator, stainless steel radiator and so on.
New heat pipe heat dissipation technology:
Heat pipe is a new type of heat transfer element with high thermal conductivity. It transfers heat through the evaporation and condensation of liquid in a completely closed vacuum tube. It uses the principle of fluid absorption and so on. It plays a good cooling effect. It has high thermal conductivity, good isothermal property, heat transfer area on both sides of cold and hot can be changed arbitrarily, long-distance heat transfer and temperature can be controlled.
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