The ultra capacitors are replacing lead-acid battery to become the main power storage device of the backup power supply to wind turbine pitching control systems. This is widely accepted in the wind power industry. As most of the first batch of lead-acid battery ended their life cycle as power storage device for wind turbine pitching control system, more and more owners of the wind fields choose ultra capacitor as backup power supply. The deployment of ultra capacitor in the new turbines is pushing the procurements of ultra capacitors as well as the replacement of the lead acid batteries with ultra capacitors and upgrade the backup power supplies in the existing turbines.
The unique characteristics of ultra capacitor, such as high-power discharging capability, low temperature performance, strong environment adaptability, long life cycle, maintenance free etc. help the acceptance from customers. It will significantly enhance the reliability, safety and maintenance-free features of the power supply system. During the working process of wind turbine, high power for pitching control is needed, and the high-power discharge capacity of the ultra capacitor can fully satisfy this demand. Moreover, the ultra capacitor has a life cycle for as many as a million times, which could reduce the maintenance cost of the system.
According to engineers from SPS Technology Co. Ltd.，a leading firm in ultra capacitor industry, the key characteristics of ultra capacitor in wind turbine pitching control system include the following three aspects:
1.Reliable performance under a wide range of temperature
No chemical reaction occurs during the power storage process of ultra capacitor. The electrode material is activated carbon, which will not change at low temperature, and the relatively low freezing point of electrolyte ensures its stable performance both under high and low temperature. The SPSCAP ultra capacitor can work in a wide temperature range from -40℃ to 65℃, especially in the cold season, it is stable and reliable, which solves the problem that the service efficiency of lead-acid battery is greatly reduced in cold weather.
2. Good adaptabilities to various geographical environment.
Ultra capacitor module or the wind turbines can be used in various geographical environment, regardless of whether it is on the sea or plateau, under high or low temperature, in high humidity, high altitude, or salt fog environment, it can always have rated performance and is suitable for wind field under various climate conditions.
3.Good mechanical reliability for module structure
Ultra capacitor module is composed of multiple ultra capacitor cells in serial or parallel connection to form energy storage devices with different capacitance. The modules are connected by reliable electrical connection and with insulation protection measures. The well-designed and validated ultra capacitor module has a very reliable structure, so it is able to maintain a stable and reliable performance even under constant rotation and vibration.
Generally speaking, the ultra capacitor module not only has good working performance, but also has other features like monitor-able, maintenance-free, easy-to-maintenan, which makes it irreplaceable in the maintenance cost down and improvement of the reliability of the wind turbine pitching control system. It is the primary choice for the back-up power supply of wind turbine pitching control system.
Supreme Power Solutions Co., Ltd. (SPS) is a leading manufacturer of ultracapacitors, as well as a provider of ultracapacitor energy storage systems and technological solutions. Our products have wide industry applications, such as new energy vehicles, wind turbines pitching control systems, trams and subways, smart grid, micro grid, heavy duty machineries, intelligent instrument, etc. We support more than 180 Chinese customers, and our products are exported to 23 countries and territories.