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What Is The Efficiency Of Solar Inverter?
- Jun 01, 2017 -

The efficiency of solar inverter refers to the growing demand for solar energy inverters (optoelectronic inverters) due to the demand for renewable energy. And these solar inverter require very high efficiency and reliability. The power circuits used in these inverters were investigated and the best choice for switching and rectifying devices was recommended. The general structure of the photoelectric inverter shown in Figure 1, there are three different inverters to choose from. Solar light on a solar module connected in series, each module contains a series of solar cells (Solar Cell) unit. The solar module generates DC (DC) voltages in the order of several hundred volts, depending on the lighting conditions of the module array, the temperature of the battery, and the number of modules in series.

The primary function of a solar inverter is to convert the input DC voltage to a stable value. This function is implemented by a boost converter and requires boost switches and boost diodes. In the first structure, the boost stage is followed by an isolated full-bridge converter. Full bridge transformer is used to provide isolation. The second full-bridge converter on the output is used to convert the DC from the DC converter of the first stage to the AC (AC) voltage. The output is then filtered via an additional dual-contact relay switch connected to the AC grid network,

 The purpose is to provide safe isolation in the event of a fault and to isolate it from the grid at night. The second structure is a non-isolation scheme. Wherein the AC AC voltage is directly generated by the DC voltage output from the boost stage. The third structure utilizes the innovative topology of power switches and power diodes to integrate the functions of the boost and AC ACs into a dedicated topology. Although the conversion efficiency of solar panels is very low, the efficiency of solar inverter As close as possible to 100% is very important. In Germany, the 3kW series module mounted on the south-facing roof is expected to generate 2550 kWh per year. If the inverter efficiency from 95% to 96%, each year can be more power 25kWh. While the use of additional solar modules to produce this 25kWh cost is equivalent to adding an inverter. As the efficiency from 95% to 96% will not make the cost of the inverter doubled, so the more efficient inverter investment is an inevitable choice. For emerging designs, the most cost-effective way to improve inverter efficiency is the key design criteria. As for the reliability and cost of solar inverter is the other two design criteria. Higher efficiency can reduce the temperature fluctuation in the load cycle, thus improving the reliability, so these criteria are actually related. The use of the module also improves reliability.