Supercapacitors are replacing lead-acid batteries as the main energy storage device for backup power supply of wind turbine pitch control systems, which has reached consensus in the global wind power industry. With the first batch of wind turbine pitch control systems using lead-acid batteries coming to an end, more and more project owners and wind power operators are choosing supercapacitor energy storage systems as backup power sources. The dual surge of new and replacement applications has pushed the application of supercapacitors in the field of wind turbine pitch control systems to an unprecedented high.
This is due to the strong high-power discharge capacity, good low-temperature performance, strong environmental applicability, long cycle time, and maintenance free characteristics of supercapacitors. Using the backup power supply of the wind turbine pitch control system greatly improves the reliability, safety, and maintenance free performance of the pitch power supply. During the operation of the fan, the power required for pitch control is very high, and the unique high-power discharge capacity of the supercapacitor fully meets this demand. The maximum cycle life of up to one million cycles reduces the maintenance cost of the fan pitch system.
Regarding the key characteristics of supercapacitors applied in wind power pitch systems, the application engineers of the leading supercapacitor company, Jixing Technology SPS, believe that they mainly include three aspects. Firstly, the reliability is good over a wide temperature range, and the supercapacitor does not undergo chemical reactions during energy storage. The electrode material is activated carbon, which will not change at low temperatures, and the electrolyte with a low freezing point ensures its good high and low temperature characteristics. SPSCAP supercapacitors can operate in a wide temperature range of -40 ℃ -65 ℃, especially in cold seasons, which is stable and reliable, solving the problem of greatly reducing the efficiency of lead-acid batteries in outdoor cold environments.
Secondly, adapt to different geographical environments. The supercapacitor module can meet the needs of wind turbines in different geographical environments, whether at sea or on high plateaus, and has excellent performance in high and low temperatures, high humidity, high altitude, and salt mist environments. It is suitable for wind farms in various climatic conditions.
Finally, the mechanical reliability of the module structure is good. A supercapacitor module is an energy storage device composed of multiple supercapacitors in series/parallel with different capacity levels. It adopts reliable electrical connections and insulation protection measures. After optimization design and effective verification, the supercapacitor module structure has good reliability, and can maintain the stability and reliability of the product under continuous rotation and vibration conditions.
In summary, supercapacitor modules not only have good energy storage characteristics, but also have status monitoring, maintenance free, and easy maintenance. They play an irreplaceable role in reducing the operation and maintenance costs of wind turbine pitch systems and improving reliability. They can be said to be the best choice for backup power supply of wind turbine pitch systems.
