Oct 10, 2025
Capacitors for renewable energy applications
Renewable energy systems use high-power conversion technologies. Inverters are the core of these systems and incorporate high-voltage and high-capacitance units.
The efficiency of power conversion and reliability of long-term operation still the key points. Therefore, highly reliable DC link capacitors are required.
Solar Inverters – from 3 kW residential inverter up to 500 kW large central inverter - work typically with output voltages about 600V, 800V, and 1,000V.
Wind Power Inverter
Traditionally, aluminum electrolytic capacitors were used as DC link capacitors connected in series, but because they require periodic maintenance and replacement and have limited tolerance to overvoltage, large capacitance film capacitors are more and more used in recent large wind power inverters.
The outstanding withstanding voltage of the AIC film capacitors makes a significant difference here, when the no-load induced voltage of PMSG (permanent magnet synchronous generator) type generator increases in proportion to the wind turbine speed and DC-Link overvoltage must be absorbed.
Depending on the power range, maximum allowable voltage, available space, lifetime requirements, and design cost, either AIC aluminum electrolytic or AIC film capacitors have successfully proved their worth by meeting these requirements.