Retrofitting about Backup Power Supply of Wind Power Pitch  

Super capacitor can effectively improve the service lifespan of backup power supply and reduce the maintenance time, reduce battery failures, increase wind turbine utilization, improve the charging efficiency and the safety performance of the unit.

Upgrading of Frequency Converter  

Adopting mature and advanced domestic frequency converter to replace the old ones. Which can effectively reduce the maintenance cost and improve the available working hours of the unit.

Underlying retrofitting of frequency converter: underlying water-cooled or air-cooled frequency converters can effectively solve the problem of over temperature in engine room, and improve the efficiency of frequency converter fault maintenance and the availability of the unit.

Upgrading of Old Pitch System  

Adopting mature and advanced domestic pitch system to replace the old pitch system, effectively improve the utilization rate of hub space, reduce the maintenance cost, increase the available working hours, and enhance the safety of the unit.

Upgrading of Pitch Slip Ring  

Using upgraded non-contact laser slip ring to replace the contact slip ring. The laser slip ring has core technologies of wireless power transmission, laser communication and anti-interference technology. And the pitch adopts contact power supply, the communication transmission adopts non-contact technology (laser communication) based on fast FPGA processing. Which can completely eliminate the communication failures caused by ring wear, wire skipping, etc. The non-contact transmission mode is adopted to transmit the signal without wearing, so as to ensure the stability and reliability of pitch communication.

Upgrading of Wiring Cabinet  

Adopting the switch cabinet to replace the wiring cabinet, which can realize the three-level protection of the circuit breaker of unit frequency converter, switch cabinet and box transformer, enhancing the unit’s safety performance. And the switch cabinet can be linked to the main control system, realizing the remote switching on and off function.

Upgrade Efficient Power Generation Capacity Improvement  

CSSC Haizhuang Windpower has developed three blade boosters, namely blade body spoiler, blade body vortex generator (VG) system and blade tip winglet. For the tip vortex, a folded line tip winglet can be installed to reduce the vortex phenomenon and increase the diameter of the rotor. As for the air flow separation at the trailing edge of the blade, a vortex generator or spoiler can be installed on the blade body to reduce the air flow separation.

Radar Rectifying Technology  

The Lidar anemometer shoots a laser beam of 80 meters straight ahead horizontally with an included angle of 60°. It can measure wind speed and wind direction 70 meters ahead, and detect wind shear, gust, turbulence, spoiler and wake. There are both dynamic and static measurement schemes.
 ● Dynamic measurement solution: Integrate the Lidar wind measuring instrument with the main control of the unit to realize real-time measurement of wind speed and wind direction, and then optimize the control strategy to reduce the load of the unit, as well as improve the power generation of the unit.
 ● Static measurement scheme: Install the Lidar anemometer on the top of the engine room, measure and collect data for a period of time, and then analyze it to obtain the yaw error angle of the unit, and modify it to improve the power generation of the unit.

Yada Algorithm for Rectifying Unit Yaw Error  

The YADA algorithm needs to combine information such as yaw drive control, yaw angle measurement, load safety, operating status and wind condition data, etc. Calculating the yaw error through the MATLAB program to improve the yaw-to-wind accuracy.