Is the photovoltaic inverter too hot? You need to dissipate heat!
As the core of the photovoltaic power station, the inverter life span affects the normal operation of the entire power station, and the heat dissipation performance of the inverter has the greatest impact on the life span of the device. How much do you know about the heat dissipation of photovoltaic inverters? Today, Baby Zhanyu will talk about the relevant knowledge about the heat dissipation of inverters.
Why the inverter needs to dissipate heat
The components in the inverter have a rated operating temperature. If the heat dissipation performance of the inverter is relatively poor, when the inverter continues to work, the heat of the components has been collected in the cavity, and its temperature will become higher and higher. Excessive temperature will reduce the performance and life of components, and the machine is prone to failure.
When the inverter is working, it generates heat and power loss is unavoidable. For example, a 5kW inverter has a system heat loss of about 75-125W, which affects the power generation. Requires optimized heat dissipation design to reduce heat dissipation loss.
Natural heat dissipation:
Natural heat dissipation means that no external auxiliary energy is used to allow local heating devices to dissipate heat to the surrounding environment, thereby achieving temperature control. Natural heat dissipation is suitable for low-power devices that do not require high temperature control.
Forced air cooling
The cooling method of forced heat dissipation is mainly a method of taking away the heat emitted by the device by means of a fan. At present, the material of the radiator is mainly aluminum or copper.
How to choose the right heat dissipation method
Under normal circumstances, the allowable operating temperature rise of electronic devices is between 40-60°C. In the case of a temperature rise of 60°C, natural cooling can bear a maximum heat flux density of 0.05W/cm2. When the heat flow density is greater than 0.05W/cm2, forced air cooling is a good choice in terms of economy and performance. If the heat flow density continues to increase, other heat dissipation methods such as liquid cooling are required.
The latest cooling technology
With the continuous development of electronic technology, inverters have achieved great development in terms of heat dissipation:
Chamber management:
The components most susceptible to temperature in inverters are operational amplifiers, sensors, electrolytic capacitors, etc. Inductors, cables, power switches, etc. are relatively high For example, the inductor is placed outside the inverter to reduce the temperature in the case. At the same time, an integral shell structure can be adopted. The radiator and the shell are directly connected closely, allowing the aluminum alloy shell to dissipate heat through two paths, so as to achieve the effect of reducing the temperature of the components and the internal temperature of the inverter, ensuring that the components and the reverse Longer service life of the converter.
Simulation technology for heat dissipation:
The simulation software can be used to simulate the thermal conditions of the system more realistically, and the operating temperature of each component can be predicted during the design process, so that unreasonable inverter structure layout can be corrected, thereby shortening the design development cycle and reducing Cost, improve the first-time success rate of the product.
New heat dissipation material application:
For example, steel radiators, aluminum alloy radiators, copper radiators, copper-aluminum composite radiators, steel-aluminum composite radiators, stainless steel radiators, etc.
New heat pipe cooling technology:
The heat pipe is a new type of heat transfer element with extremely high thermal conductivity. It transfers heat through the evaporation and condensation of the liquid in the fully enclosed vacuum tube. It uses fluid principles such as hair absorption to achieve a good cooling effect. It has the characteristics of extremely high thermal conductivity, good isothermal property, the heat transfer area on both sides of the cold and heat can be changed arbitrarily, the heat can be transferred over a long distance, and the temperature can be controlled.
