Photovoltaic inverter too hot? Knowledge of photovoltaic inverter heat dissipation
As the core of a photovoltaic power station, the life of thephotovoltaic inverter affects the normal operation of the entire power station, while the photovoltaic inverter cooling performance has the greatest influence on the life of the device. How much are you aware about the heat dissipation of photovoltaic inverters? Speak of the related knowledge of the heat dissipation of inverters today.
Why should the photovoltaic inverter dissipate heat
Components in the photovoltaic inverter have rated operating temperature. If the heat dissipation performance of the photovoltaic inverter is poor, when the photovoltaic inverter continues to collaborate, the heat of components has been collecting inside the cavity, and its temperature will become higher and higher. High temperature will reduce the performance and life of components. The machine is prone to failure.
When the photovoltaic inverter works, it generates heat, and the power loss is inevitable. For example, for an photovoltaic inverter of 5kW, the system heat loss is about 75-125w, which affects the power generation. It is necessary in order to reduce the heat dissipation by optimizing the heat dissipation design.
Second, the heat dissipation mode of pv inverter
Natural heat dissipation:
Natural heat dissipation means that no external auxiliary energy is used to let the district heating device dissipate heat to the surrounding environment, so as to achieve temperature control. Untreated heat dissipation is suitable for low-power devices with low requirements for temperature control.
Forced air cooling
Forced cooling is a way of cooling by means of a fan, which takes away the heat emitted by the device. At present, the material of the pv inverter heat sink basically is to use aluminium or copper.
Three, how to choose the right way of heat dissipation
Generally, the operating temperature of electronic devices is allowed to rise to between 40 and 60. As the temperature rise of 60, natural cooling can bear the maximum heat flux of 0.05w /cm2. When the heat flux is larger than 0.05w /cm2, forced air-cooling is a good choice in terms of economy and performance. If the heat flux continues to grow, liquid cooling and other cooling methods are required.
The latest cooling technology
With the continuous development of electronic technology, pv inverters have achieved great development in terms of heat dissipation:
Sectional cavity management:
The components most susceptible to the influence of temperature in the photovoltaic inverter are operational amplifier, sensor, electrolytic capacitor, etc., inductance, cable, power switch tube, etc., which are relatively resistant to high temperature, can be separated from heating components by the method of cavity separation. The power of heating components, such as inductance, can be placed outside the photovoltaic inverter to reduce the temperature inside the chassis. At the same time, the integral shell structure can be laid down. The heat sink is directly connected with the shell, so that the aluminum alloy shell can dissipate heat through two paths, thus achieving the effect of reducing the temperature of components and the internal temperature of the pv inverter, ensuring the longer service life of components and pv inverters.
Simulation technology for heat dissipation:
The simulation software can be used to simulate the thermal status of the system, and the working temperature value of each component can be predicted in the design process. In this way, the unreasonable photovoltaic inverter structure layout can be corrected, so as to shorten the design development cycle, reduce the cost, and improve the success rate of the product.
Application of new cooling materials:
For example, steel heat sink, aluminum heat sink, copper heat sink, copper aluminum composite heat sink, steel aluminum composite heat sink, stainless steel heat sink.
New heat pipe cooling technology:
Heat pipe is a new type of heat transfer element with high thermal conductivity. It transfers heat through evaporation and condensation of liquid in a fully closed vacuum tube. With high thermal conductivity, good isotherm, the heat transfer area on both sides of cold and hot can be changed arbitrarily, can be long-distance heat transfer, temperature can be controlled and so on.
In a word, inverter cooling is not only related to the performance and life of the inverter, but also related to the power generation of the user. In evaluating the performance of the inverter, it is an important link of cannot be ignored.