To ensure reliable and safe operation of the electrical pitch control systems, SPEL WP Series Supercapacitors provide the necessary backup power to orient the rotor blades in a fail-safe position in the event of a power loss.
Advantage of Using Supercapacitor for Wind Pitch Control Reliability and Safety, requirement limits energy storage options, batteries require a significant structure to support them in rotation as well as insulation to stave off the effects of cold. Battery assisted system requires venting provision to remove hydrogen gas build-up from cycling, also moisture protection and Battery management systems for better service life.
Supercapacitors scores over battery for this critical application as they are lightweight and nearly solid state devices. In cold weather the higher power capability of supercapacitors compared to batteries translates to faster response time for similarly designed systems. The transition from battery to supercapacitor based designs improves economics for wind farm operation. Due to longer life span (more than 10 years) and practically no maintenance required, the economics become more significant for offshore wind installations.